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diff --git a/loadgen-rust/Cargo.toml b/loadgen-rust/Cargo.toml
new file mode 100644
index 0000000..833c046
--- /dev/null
+++ b/loadgen-rust/Cargo.toml
@@ -0,0 +1,109 @@
+# Copyright (C) INFINI Labs & INFINI LIMITED.
+#
+# The INFINI Loadgen is offered under the GNU Affero General Public License v3.0
+# and as commercial software.
+#
+# For commercial licensing, contact us at:
+#   - Website: infinilabs.com
+#   - Email: hello@infini.ltd
+#
+# Open Source licensed under AGPL V3:
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+[package]
+name = "loadgen"
+version = "0.1.0"
+edition = "2021"
+authors = ["INFINI Labs <hello@infini.ltd>"]
+description = "A high-performance HTTP load generator and testing suite"
+license = "AGPL-3.0"
+homepage = "https://github.com/infinilabs/loadgen"
+repository = "https://github.com/infinilabs/loadgen"
+keywords = ["load-testing", "http", "benchmark", "performance"]
+categories = ["command-line-utilities", "development-tools::testing"]
+
+[dependencies]
+# Async runtime
+tokio = { version = "1", features = ["full", "sync", "time", "signal", "rt-multi-thread", "macros"] }
+
+# CLI argument parsing
+clap = { version = "4", features = ["derive", "env"] }
+
+# Serialization
+serde = { version = "1", features = ["derive"] }
+serde_yaml = "0.9"
+serde_json = "1"
+
+# HTTP client
+reqwest = { version = "0.12", features = ["gzip", "rustls-tls", "json", "stream"] }
+
+# UUID generation
+uuid = { version = "1", features = ["v4"] }
+
+# Time handling
+chrono = { version = "0.4", features = ["serde"] }
+
+# Random number generation
+rand = "0.8"
+
+# Roaring bitmap for int_array_bitmap variable type
+roaring = "0.10"
+
+# Base64 encoding for bitmap serialization
+base64 = "0.22"
+
+# Regex for assertions and DSL parsing
+regex = "1"
+
+# Histogram for latency metrics
+hdrhistogram = "7"
+
+# Rate limiting
+governor = "0.7"
+
+# Logging
+tracing = "0.1"
+tracing-subscriber = { version = "0.3", features = ["env-filter"] }
+
+# Synchronization primitives
+parking_lot = "0.12"
+
+# Compression
+flate2 = "1"
+
+# Error handling
+thiserror = "1"
+anyhow = "1"
+
+# Signal handling (Ctrl+C)
+ctrlc = { version = "3", features = ["termination"] }
+
+# Formatting byte sizes
+bytesize = "1"
+
+[dev-dependencies]
+# Testing utilities
+tempfile = "3"
+mockito = "1"
+
+[profile.release]
+lto = true
+codegen-units = 1
+panic = "abort"
+strip = true
+opt-level = 3
+
+[profile.bench]
+lto = true
+codegen-units = 1
diff --git a/loadgen-rust/README.md b/loadgen-rust/README.md
new file mode 100644
index 0000000..9a16761
--- /dev/null
+++ b/loadgen-rust/README.md
@@ -0,0 +1,152 @@
+# INFINI Loadgen (Rust)
+
+A high-performance HTTP load generator and testing suite written in Rust, compatible with the original Go implementation's configuration files.
+
+## Features
+
+- **High Performance**: Built with Tokio async runtime for maximum throughput
+- **Compatible Configuration**: Supports the same YAML and DSL configuration formats as the Go version
+- **Variable System**: Full support for all variable types including:
+  - `file` - Load from external files
+  - `list` - Inline defined lists
+  - `sequence` / `sequence64` - Auto-incrementing sequences
+  - `range` - Random numbers in range
+  - `uuid` - UUID v4 generation
+  - `now_local`, `now_utc`, `now_unix` - Time variables
+  - `now_with_format` - Custom formatted time
+  - `random_array` - Random arrays from other variables
+  - `int_array_bitmap` - Roaring bitmap encoded arrays
+- **Template Engine**: `$[[variable]]` syntax for dynamic request generation
+- **Response Assertions**: Validate responses with conditions (equals, contains, regexp, range, etc.)
+- **Rate Limiting**: Control request rate with `-r` flag
+- **Metrics**: Detailed latency histograms and percentiles
+
+## Building
+
+```bash
+cd loadgen-rust
+cargo build --release
+```
+
+The binary will be at `target/release/loadgen`.
+
+## Usage
+
+```bash
+# Run with default config (loadgen.yml)
+./loadgen
+
+# Run with specific config
+./loadgen -C myconfig.yml
+
+# Run DSL file
+./loadgen --run test.dsl
+
+# Load test with concurrency
+./loadgen -c 10 -d 30 -r 1000
+
+# Mixed mode (run both DSL and YAML)
+./loadgen --run test.dsl -C config.yml --mixed
+```
+
+## CLI Options
+
+| Flag | Description | Default |
+|------|-------------|---------|
+| `-c, --concurrency` | Number of concurrent threads | 1 |
+| `-d, --duration` | Test duration in seconds | 5 |
+| `-r, --rate` | Max requests per second (-1 = unlimited) | -1 |
+| `-l, --limit` | Total request limit (-1 = unlimited) | -1 |
+| `--timeout` | Request timeout in seconds (0 = no timeout) | 0 |
+| `--read-timeout` | Read timeout in seconds | 0 |
+| `--write-timeout` | Write timeout in seconds | 0 |
+| `--dial-timeout` | Connection dial timeout in seconds | 3 |
+| `--compress` | Enable gzip compression | false |
+| `--mixed` | Enable mixed YAML/DSL mode | false |
+| `--total-rounds` | Number of request rounds (-1 = unlimited) | -1 |
+| `--run` | Path to DSL file | - |
+| `-C, --config` | Path to YAML config | loadgen.yml |
+| `--log` | Log level (trace, debug, info, warn, error) | info |
+| `--debug` | Enable debug mode | false |
+
+## Configuration Format
+
+### YAML Configuration (`loadgen.yml`)
+
+```yaml
+env:
+  ES_USERNAME: elastic
+  ES_PASSWORD: password
+  ES_ENDPOINT: http://localhost:9200
+
+runner:
+  total_rounds: 1
+  no_warm: true
+  log_requests: false
+  assert_invalid: false
+  assert_error: false
+  default_endpoint: $[[env.ES_ENDPOINT]]
+  default_basic_auth:
+    username: $[[env.ES_USERNAME]]
+    password: $[[env.ES_PASSWORD]]
+
+variables:
+  - name: id
+    type: sequence
+  - name: uuid
+    type: uuid
+  - name: user
+    type: list
+    data:
+      - alice
+      - bob
+      - charlie
+
+requests:
+  - request:
+      method: POST
+      url: /_bulk
+      body: |
+        {"index": {"_index": "test", "_id": "$[[uuid]]"}}
+        {"id": "$[[id]]", "user": "$[[user]]"}
+```
+
+### DSL Configuration
+
+```dsl
+# runner: {"total_rounds": 1, "no_warm": true}
+# variables: [{"name": "id", "type": "sequence"}]
+
+DELETE /test
+
+PUT /test
+
+POST /test/_doc/$[[id]]
+{
+  "name": "test document"
+}
+
+GET /test/_search
+# 200
+```
+
+## Response Assertions
+
+```yaml
+requests:
+  - request:
+      method: GET
+      url: /test/_search
+    assert:
+      equals:
+        _ctx.response.status: 200
+      contains:
+        _ctx.response.body: "hits"
+      range:
+        _ctx.elapsed:
+          lte: 1000
+```
+
+## License
+
+AGPL-3.0 - See [LICENSE](../LICENSE) for details.
diff --git a/loadgen-rust/src/assertion/conditions.rs b/loadgen-rust/src/assertion/conditions.rs
new file mode 100644
index 0000000..d95d6f2
--- /dev/null
+++ b/loadgen-rust/src/assertion/conditions.rs
@@ -0,0 +1,345 @@
+// Copyright (C) INFINI Labs & INFINI LIMITED.
+//
+// The INFINI Loadgen is offered under the GNU Affero General Public License v3.0
+// and as commercial software.
+//
+// For commercial licensing, contact us at:
+//   - Website: infinilabs.com
+//   - Email: hello@infini.ltd
+//
+// Open Source licensed under AGPL V3:
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+//! Assertion conditions for response validation
+
+use std::collections::HashMap;
+
+use regex::Regex;
+use tracing::debug;
+
+use crate::config::types::AssertConfig;
+
+/// Assertion checker for validating responses
+pub struct AssertionChecker<'a> {
+    ctx: &'a HashMap<String, serde_json::Value>,
+}
+
+impl<'a> AssertionChecker<'a> {
+    /// Create a new assertion checker
+    pub fn new(ctx: &'a HashMap<String, serde_json::Value>) -> Self {
+        Self { ctx }
+    }
+
+    /// Check all assertions in the config
+    pub fn check(&self, config: &AssertConfig) -> bool {
+        // Check equals
+        for (field, expected) in &config.equals {
+            if !self.check_equals(field, expected) {
+                debug!("equals assertion failed for {}: expected {:?}", field, expected);
+                return false;
+            }
+        }
+
+        // Check not_equals
+        for (field, expected) in &config.not_equals {
+            if self.check_equals(field, expected) {
+                debug!("not_equals assertion failed for {}", field);
+                return false;
+            }
+        }
+
+        // Check contains
+        for (field, expected) in &config.contains {
+            if !self.check_contains(field, expected) {
+                debug!("contains assertion failed for {}: expected to contain {:?}", field, expected);
+                return false;
+            }
+        }
+
+        // Check not_contains
+        for (field, expected) in &config.not_contains {
+            if self.check_contains(field, expected) {
+                debug!("not_contains assertion failed for {}", field);
+                return false;
+            }
+        }
+
+        // Check regexp
+        for (field, pattern) in &config.regexp {
+            if !self.check_regexp(field, pattern) {
+                debug!("regexp assertion failed for {}: pattern {:?}", field, pattern);
+                return false;
+            }
+        }
+
+        // Check not_regexp
+        for (field, pattern) in &config.not_regexp {
+            if self.check_regexp(field, pattern) {
+                debug!("not_regexp assertion failed for {}", field);
+                return false;
+            }
+        }
+
+        // Check range
+        for (field, range) in &config.range {
+            if !self.check_range(field, range) {
+                debug!("range assertion failed for {}", field);
+                return false;
+            }
+        }
+
+        // Check in
+        for (field, values) in &config.in_list {
+            if !self.check_in(field, values) {
+                debug!("in assertion failed for {}", field);
+                return false;
+            }
+        }
+
+        // Check not_in
+        for (field, values) in &config.not_in {
+            if self.check_in(field, values) {
+                debug!("not_in assertion failed for {}", field);
+                return false;
+            }
+        }
+
+        true
+    }
+
+    /// Get a value from the context
+    fn get_value(&self, field: &str) -> Option<&serde_json::Value> {
+        // Direct lookup
+        if let Some(value) = self.ctx.get(field) {
+            return Some(value);
+        }
+
+        // Try nested lookup for body_json paths
+        if field.starts_with("_ctx.response.body_json.") {
+            if let Some(body_json) = self.ctx.get("_ctx.response.body_json") {
+                let path = field.strip_prefix("_ctx.response.body_json.")?;
+                return self.get_nested_value(body_json, path);
+            }
+        }
+
+        None
+    }
+
+    /// Get a nested value from JSON
+    fn get_nested_value<'b>(&self, json: &'b serde_json::Value, path: &str) -> Option<&'b serde_json::Value> {
+        let parts: Vec<&str> = path.split('.').collect();
+        let mut current = json;
+
+        for part in parts {
+            match current {
+                serde_json::Value::Object(map) => {
+                    current = map.get(part)?;
+                }
+                serde_json::Value::Array(arr) => {
+                    let idx: usize = part.parse().ok()?;
+                    current = arr.get(idx)?;
+                }
+                _ => return None,
+            }
+        }
+
+        Some(current)
+    }
+
+    /// Check equals assertion
+    fn check_equals(&self, field: &str, expected: &serde_json::Value) -> bool {
+        match self.get_value(field) {
+            Some(actual) => actual == expected,
+            None => false,
+        }
+    }
+
+    /// Check contains assertion
+    fn check_contains(&self, field: &str, expected: &str) -> bool {
+        match self.get_value(field) {
+            Some(serde_json::Value::String(s)) => s.contains(expected),
+            Some(v) => v.to_string().contains(expected),
+            None => false,
+        }
+    }
+
+    /// Check regexp assertion
+    fn check_regexp(&self, field: &str, pattern: &str) -> bool {
+        let regex = match Regex::new(pattern) {
+            Ok(r) => r,
+            Err(_) => return false,
+        };
+
+        match self.get_value(field) {
+            Some(serde_json::Value::String(s)) => regex.is_match(s),
+            Some(v) => regex.is_match(&v.to_string()),
+            None => false,
+        }
+    }
+
+    /// Check range assertion
+    fn check_range(&self, field: &str, range: &crate::config::types::RangeCondition) -> bool {
+        let value = match self.get_value(field) {
+            Some(serde_json::Value::Number(n)) => n.as_f64(),
+            _ => None,
+        };
+
+        let value = match value {
+            Some(v) => v,
+            None => return false,
+        };
+
+        if let Some(gte) = range.gte {
+            if value < gte {
+                return false;
+            }
+        }
+
+        if let Some(gt) = range.gt {
+            if value <= gt {
+                return false;
+            }
+        }
+
+        if let Some(lte) = range.lte {
+            if value > lte {
+                return false;
+            }
+        }
+
+        if let Some(lt) = range.lt {
+            if value >= lt {
+                return false;
+            }
+        }
+
+        true
+    }
+
+    /// Check in assertion
+    fn check_in(&self, field: &str, values: &[serde_json::Value]) -> bool {
+        match self.get_value(field) {
+            Some(actual) => values.contains(actual),
+            None => false,
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn make_ctx(pairs: Vec<(&str, serde_json::Value)>) -> HashMap<String, serde_json::Value> {
+        pairs.into_iter().map(|(k, v)| (k.to_string(), v)).collect()
+    }
+
+    #[test]
+    fn test_check_equals() {
+        let ctx = make_ctx(vec![
+            ("_ctx.response.status", serde_json::json!(200)),
+            ("_ctx.response.body", serde_json::json!("hello")),
+        ]);
+
+        let checker = AssertionChecker::new(&ctx);
+
+        assert!(checker.check_equals("_ctx.response.status", &serde_json::json!(200)));
+        assert!(!checker.check_equals("_ctx.response.status", &serde_json::json!(201)));
+        assert!(checker.check_equals("_ctx.response.body", &serde_json::json!("hello")));
+    }
+
+    #[test]
+    fn test_check_contains() {
+        let ctx = make_ctx(vec![
+            ("_ctx.response.body", serde_json::json!("hello world")),
+        ]);
+
+        let checker = AssertionChecker::new(&ctx);
+
+        assert!(checker.check_contains("_ctx.response.body", "world"));
+        assert!(!checker.check_contains("_ctx.response.body", "foo"));
+    }
+
+    #[test]
+    fn test_check_regexp() {
+        let ctx = make_ctx(vec![
+            ("_ctx.response.body", serde_json::json!("hello123world")),
+        ]);
+
+        let checker = AssertionChecker::new(&ctx);
+
+        assert!(checker.check_regexp("_ctx.response.body", r"\d+"));
+        assert!(!checker.check_regexp("_ctx.response.body", r"^\d+$"));
+    }
+
+    #[test]
+    fn test_check_range() {
+        let ctx = make_ctx(vec![
+            ("_ctx.elapsed", serde_json::json!(150)),
+        ]);
+
+        let checker = AssertionChecker::new(&ctx);
+
+        let range = crate::config::types::RangeCondition {
+            gte: Some(100.0),
+            lte: Some(200.0),
+            ..Default::default()
+        };
+
+        assert!(checker.check_range("_ctx.elapsed", &range));
+
+        let range2 = crate::config::types::RangeCondition {
+            gt: Some(150.0),
+            ..Default::default()
+        };
+
+        assert!(!checker.check_range("_ctx.elapsed", &range2));
+    }
+
+    #[test]
+    fn test_check_in() {
+        let ctx = make_ctx(vec![
+            ("_ctx.response.status", serde_json::json!(200)),
+        ]);
+
+        let checker = AssertionChecker::new(&ctx);
+
+        assert!(checker.check_in(
+            "_ctx.response.status",
+            &[serde_json::json!(200), serde_json::json!(201)]
+        ));
+        assert!(!checker.check_in(
+            "_ctx.response.status",
+            &[serde_json::json!(400), serde_json::json!(500)]
+        ));
+    }
+
+    #[test]
+    fn test_check_config() {
+        let ctx = make_ctx(vec![
+            ("_ctx.response.status", serde_json::json!(200)),
+            ("_ctx.response.body", serde_json::json!("success")),
+        ]);
+
+        let checker = AssertionChecker::new(&ctx);
+
+        let mut config = AssertConfig::default();
+        config.equals.insert("_ctx.response.status".to_string(), serde_json::json!(200));
+        config.contains.insert("_ctx.response.body".to_string(), "success".to_string());
+
+        assert!(checker.check(&config));
+
+        config.equals.insert("_ctx.response.status".to_string(), serde_json::json!(201));
+        assert!(!checker.check(&config));
+    }
+}
diff --git a/loadgen-rust/src/assertion/mod.rs b/loadgen-rust/src/assertion/mod.rs
new file mode 100644
index 0000000..19812eb
--- /dev/null
+++ b/loadgen-rust/src/assertion/mod.rs
@@ -0,0 +1,26 @@
+// Copyright (C) INFINI Labs & INFINI LIMITED.
+//
+// The INFINI Loadgen is offered under the GNU Affero General Public License v3.0
+// and as commercial software.
+//
+// For commercial licensing, contact us at:
+//   - Website: infinilabs.com
+//   - Email: hello@infini.ltd
+//
+// Open Source licensed under AGPL V3:
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+//! Assertion module for loadgen
+
+pub mod conditions;
diff --git a/loadgen-rust/src/config/dsl.rs b/loadgen-rust/src/config/dsl.rs
new file mode 100644
index 0000000..ad57225
--- /dev/null
+++ b/loadgen-rust/src/config/dsl.rs
@@ -0,0 +1,328 @@
+// Copyright (C) INFINI Labs & INFINI LIMITED.
+//
+// The INFINI Loadgen is offered under the GNU Affero General Public License v3.0
+// and as commercial software.
+//
+// For commercial licensing, contact us at:
+//   - Website: infinilabs.com
+//   - Email: hello@infini.ltd
+//
+// Open Source licensed under AGPL V3:
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+//! DSL parser for loadgen
+//!
+//! The DSL format supports:
+//! - Comments starting with #
+//! - JSON configuration in comments (# runner: {...}, # variables: [...])
+//! - HTTP method and path on a single line (GET /path, POST /path)
+//! - Request body on following lines until next HTTP method or comment
+//! - Expected status code comment (# 200)
+//! - Request configuration comment (# request: {...})
+
+use anyhow::{Context, Result};
+use regex::Regex;
+use std::path::Path;
+use tracing::debug;
+
+use super::types::{AppConfig, LoaderConfig, Request, RequestItem, RunnerConfig, Variable};
+
+/// Parse a DSL file and return a LoaderConfig
+pub async fn parse_dsl_file(path: &Path, app_config: &AppConfig) -> Result<LoaderConfig> {
+    let contents = tokio::fs::read_to_string(path)
+        .await
+        .with_context(|| format!("Failed to read DSL file: {:?}", path))?;
+
+    parse_dsl(&contents, app_config)
+}
+
+/// Parse DSL content and return a LoaderConfig
+pub fn parse_dsl(content: &str, app_config: &AppConfig) -> Result<LoaderConfig> {
+    let mut config = LoaderConfig {
+        runner: app_config.runner.clone(),
+        variables: app_config.variables.clone(),
+        requests: Vec::new(),
+    };
+
+    // Regex patterns
+    let http_method_re = Regex::new(r"^(GET|POST|PUT|DELETE|PATCH|HEAD|OPTIONS)\s+(.+)$").unwrap();
+    let json_comment_re = Regex::new(r"^#\s*(runner|variables|request):\s*(.+)$").unwrap();
+    let status_comment_re = Regex::new(r"^#\s*(\d{3})\s*$").unwrap();
+
+    let mut current_request: Option<RequestItem> = None;
+    let mut current_body = String::new();
+    let mut in_body = false;
+    let mut pending_json_config: Option<(String, String)> = None;
+    let mut multiline_json = String::new();
+    let mut in_multiline_json = false;
+    let mut json_brace_count = 0;
+    let mut json_bracket_count = 0;
+    let mut json_type = String::new();
+
+    for line in content.lines() {
+        let trimmed = line.trim();
+
+        // Handle multiline JSON in comments
+        if in_multiline_json {
+            // Continue collecting JSON
+            if trimmed.starts_with('#') {
+                let json_part = trimmed.trim_start_matches('#').trim();
+                multiline_json.push_str(json_part);
+                multiline_json.push('\n');
+
+                // Count braces/brackets
+                for c in json_part.chars() {
+                    match c {
+                        '{' => json_brace_count += 1,
+                        '}' => json_brace_count -= 1,
+                        '[' => json_bracket_count += 1,
+                        ']' => json_bracket_count -= 1,
+                        _ => {}
+                    }
+                }
+
+                // Check if JSON is complete
+                if json_brace_count == 0 && json_bracket_count == 0 {
+                    in_multiline_json = false;
+                    pending_json_config = Some((json_type.clone(), multiline_json.clone()));
+                    multiline_json.clear();
+                }
+            } else {
+                // Not a comment, JSON is malformed
+                in_multiline_json = false;
+                multiline_json.clear();
+            }
+            continue;
+        }
+
+        // Check for JSON configuration comments
+        if let Some(caps) = json_comment_re.captures(trimmed) {
+            let config_type = caps.get(1).unwrap().as_str();
+            let json_str = caps.get(2).unwrap().as_str();
+
+            // Count opening braces/brackets
+            json_brace_count = 0;
+            json_bracket_count = 0;
+            for c in json_str.chars() {
+                match c {
+                    '{' => json_brace_count += 1,
+                    '}' => json_brace_count -= 1,
+                    '[' => json_bracket_count += 1,
+                    ']' => json_bracket_count -= 1,
+                    _ => {}
+                }
+            }
+
+            if json_brace_count == 0 && json_bracket_count == 0 {
+                // Complete JSON on one line
+                pending_json_config = Some((config_type.to_string(), json_str.to_string()));
+            } else {
+                // Multiline JSON
+                in_multiline_json = true;
+                json_type = config_type.to_string();
+                multiline_json = json_str.to_string();
+                multiline_json.push('\n');
+            }
+            continue;
+        }
+
+        // Process pending JSON config
+        if let Some((config_type, json_str)) = pending_json_config.take() {
+            match config_type.as_str() {
+                "runner" => {
+                    if let Ok(runner) = serde_json::from_str::<RunnerConfig>(&json_str) {
+                        config.runner = runner;
+                    }
+                }
+                "variables" => {
+                    if let Ok(vars) = serde_json::from_str::<Vec<Variable>>(&json_str) {
+                        config.variables.extend(vars);
+                    }
+                }
+                "request" => {
+                    if let Some(ref mut req) = current_request {
+                        if let Ok(request) = serde_json::from_str::<Request>(&json_str) {
+                            if let Some(ref mut existing) = req.request {
+                                // Merge request config
+                                if !request.runtime_variables.is_empty() {
+                                    existing.runtime_variables = request.runtime_variables;
+                                }
+                                if !request.runtime_body_line_variables.is_empty() {
+                                    existing.runtime_body_line_variables = request.runtime_body_line_variables;
+                                }
+                                if request.repeat_body_n_times > 0 {
+                                    existing.repeat_body_n_times = request.repeat_body_n_times;
+                                }
+                                if request.basic_auth.is_some() {
+                                    existing.basic_auth = request.basic_auth;
+                                }
+                            }
+                        }
+                    }
+                }
+                _ => {}
+            }
+        }
+
+        // Skip empty lines
+        if trimmed.is_empty() {
+            if in_body {
+                current_body.push('\n');
+            }
+            continue;
+        }
+
+        // Skip regular comments (not JSON config)
+        if trimmed.starts_with('#') {
+            // Check for status code comment
+            if let Some(caps) = status_comment_re.captures(trimmed) {
+                // This is an expected status code, could be used for assertions
+                let _status: i32 = caps.get(1).unwrap().as_str().parse().unwrap_or(200);
+                // We don't do anything with status code comments for now
+            }
+
+            // Check for //  style comments (DSL comments)
+            if trimmed.starts_with("# //") || trimmed.starts_with("#//") {
+                continue;
+            }
+
+            // End body collection on regular comment
+            if in_body && !current_body.is_empty() {
+                if let Some(ref mut req) = current_request {
+                    if let Some(ref mut request) = req.request {
+                        request.body = current_body.trim_end().to_string();
+                    }
+                }
+                current_body.clear();
+                in_body = false;
+            }
+            continue;
+        }
+
+        // Check for HTTP method line
+        if let Some(caps) = http_method_re.captures(trimmed) {
+            // Save previous request
+            if let Some(mut req) = current_request.take() {
+                if in_body && !current_body.is_empty() {
+                    if let Some(ref mut request) = req.request {
+                        request.body = current_body.trim_end().to_string();
+                    }
+                }
+                config.requests.push(req);
+            }
+            current_body.clear();
+
+            let method = caps.get(1).unwrap().as_str();
+            let path = caps.get(2).unwrap().as_str();
+
+            current_request = Some(RequestItem {
+                request: Some(Request {
+                    method: method.to_string(),
+                    url: path.to_string(),
+                    ..Default::default()
+                }),
+                ..Default::default()
+            });
+            in_body = true;
+            continue;
+        }
+
+        // Collect body lines
+        if in_body {
+            if !current_body.is_empty() {
+                current_body.push('\n');
+            }
+            current_body.push_str(line);
+        }
+    }
+
+    // Save last request
+    if let Some(mut req) = current_request.take() {
+        if in_body && !current_body.is_empty() {
+            if let Some(ref mut request) = req.request {
+                request.body = current_body.trim_end().to_string();
+            }
+        }
+        config.requests.push(req);
+    }
+
+    debug!("Parsed {} requests from DSL", config.requests.len());
+    Ok(config)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_parse_simple_dsl() {
+        let dsl = r#"
+DELETE /medcl
+
+PUT /medcl
+
+POST /medcl/_doc/1
+{
+ "name": "medcl"
+}
+
+GET /medcl/_search
+"#;
+
+        let app_config = AppConfig::default();
+        let config = parse_dsl(dsl, &app_config).unwrap();
+
+        assert_eq!(config.requests.len(), 4);
+        
+        let req0 = config.requests[0].request.as_ref().unwrap();
+        assert_eq!(req0.method, "DELETE");
+        assert_eq!(req0.url, "/medcl");
+
+        let req2 = config.requests[2].request.as_ref().unwrap();
+        assert_eq!(req2.method, "POST");
+        assert_eq!(req2.url, "/medcl/_doc/1");
+        assert!(req2.body.contains("medcl"));
+    }
+
+    #[test]
+    fn test_parse_dsl_with_runner_config() {
+        let dsl = r#"
+# runner: {"total_rounds": 5, "no_warm": true}
+
+GET /test
+"#;
+
+        let app_config = AppConfig::default();
+        let config = parse_dsl(dsl, &app_config).unwrap();
+
+        assert_eq!(config.runner.total_rounds, 5);
+        assert!(config.runner.no_warm);
+    }
+
+    #[test]
+    fn test_parse_dsl_with_variables() {
+        let dsl = r#"
+# variables: [{"name": "id", "type": "sequence"}]
+
+POST /test/$[[id]]
+"#;
+
+        let app_config = AppConfig::default();
+        let config = parse_dsl(dsl, &app_config).unwrap();
+
+        assert_eq!(config.variables.len(), 1);
+        assert_eq!(config.variables[0].name, "id");
+        assert_eq!(config.variables[0].var_type, "sequence");
+    }
+}
diff --git a/loadgen-rust/src/config/mod.rs b/loadgen-rust/src/config/mod.rs
new file mode 100644
index 0000000..ae344e5
--- /dev/null
+++ b/loadgen-rust/src/config/mod.rs
@@ -0,0 +1,28 @@
+// Copyright (C) INFINI Labs & INFINI LIMITED.
+//
+// The INFINI Loadgen is offered under the GNU Affero General Public License v3.0
+// and as commercial software.
+//
+// For commercial licensing, contact us at:
+//   - Website: infinilabs.com
+//   - Email: hello@infini.ltd
+//
+// Open Source licensed under AGPL V3:
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+//! Configuration module for loadgen
+
+pub mod dsl;
+pub mod types;
+pub mod yaml;
diff --git a/loadgen-rust/src/config/types.rs b/loadgen-rust/src/config/types.rs
new file mode 100644
index 0000000..c7c4394
--- /dev/null
+++ b/loadgen-rust/src/config/types.rs
@@ -0,0 +1,427 @@
+// Copyright (C) INFINI Labs & INFINI LIMITED.
+//
+// The INFINI Loadgen is offered under the GNU Affero General Public License v3.0
+// and as commercial software.
+//
+// For commercial licensing, contact us at:
+//   - Website: infinilabs.com
+//   - Email: hello@infini.ltd
+//
+// Open Source licensed under AGPL V3:
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+//! Configuration type definitions matching the Go implementation
+
+use serde::{Deserialize, Serialize};
+use std::collections::HashMap;
+
+/// Basic authentication credentials
+#[derive(Debug, Clone, Default, Serialize, Deserialize)]
+pub struct BasicAuth {
+    #[serde(default)]
+    pub username: String,
+    #[serde(default)]
+    pub password: String,
+}
+
+/// HTTP request definition
+#[derive(Debug, Clone, Default, Serialize, Deserialize)]
+pub struct Request {
+    /// HTTP method (GET, POST, PUT, DELETE, etc.)
+    #[serde(default)]
+    pub method: String,
+
+    /// Request URL (can contain template variables)
+    #[serde(default)]
+    pub url: String,
+
+    /// Request body (can contain template variables)
+    #[serde(default)]
+    pub body: String,
+
+    /// Simple mode - no variable substitution
+    #[serde(default)]
+    pub simple_mode: bool,
+
+    /// Number of times to repeat the body in a single request
+    #[serde(default, alias = "body_repeat_times")]
+    pub repeat_body_n_times: i32,
+
+    /// HTTP headers
+    #[serde(default)]
+    pub headers: Vec<HashMap<String, String>>,
+
+    /// Basic authentication for this request
+    #[serde(default)]
+    pub basic_auth: Option<BasicAuth>,
+
+    /// Disable header names normalizing
+    #[serde(default)]
+    pub disable_header_names_normalizing: bool,
+
+    /// Runtime variables to set before executing the request
+    #[serde(default)]
+    pub runtime_variables: HashMap<String, String>,
+
+    /// Runtime variables to set per body line
+    #[serde(default)]
+    pub runtime_body_line_variables: HashMap<String, String>,
+
+    /// Number of times to execute this request
+    #[serde(default)]
+    pub execute_repeat_times: i32,
+}
+
+/// Variable definition
+#[derive(Debug, Clone, Default, Serialize, Deserialize)]
+pub struct Variable {
+    /// Variable type (file, list, sequence, uuid, etc.)
+    #[serde(rename = "type")]
+    pub var_type: String,
+
+    /// Variable name
+    #[serde(default)]
+    pub name: String,
+
+    /// File path for file type variables
+    #[serde(default)]
+    pub path: String,
+
+    /// Inline data for list type variables
+    #[serde(default)]
+    pub data: Vec<String>,
+
+    /// Date format for now_with_format type
+    #[serde(default)]
+    pub format: String,
+
+    /// Range start for range/sequence types
+    #[serde(default)]
+    pub from: u64,
+
+    /// Range end for range/sequence types
+    #[serde(default)]
+    pub to: u64,
+
+    /// Character replacement map
+    #[serde(default)]
+    pub replace: HashMap<String, String>,
+
+    /// Size for random_array type
+    #[serde(default)]
+    pub size: usize,
+
+    /// Variable key for random_array type
+    #[serde(default)]
+    pub variable_key: String,
+
+    /// Variable type for random_array (number/string)
+    #[serde(default)]
+    pub variable_type: String,
+
+    /// Whether to include square brackets for random_array
+    #[serde(default)]
+    pub square_bracket: bool,
+
+    /// String bracket character for random_array
+    #[serde(default)]
+    pub string_bracket: String,
+}
+
+/// Assertion condition configuration
+#[derive(Debug, Clone, Default, Serialize, Deserialize)]
+pub struct AssertConfig {
+    /// Equals assertion: field -> expected value
+    #[serde(default)]
+    pub equals: HashMap<String, serde_json::Value>,
+
+    /// Not equals assertion
+    #[serde(default)]
+    pub not_equals: HashMap<String, serde_json::Value>,
+
+    /// Contains assertion
+    #[serde(default)]
+    pub contains: HashMap<String, String>,
+
+    /// Not contains assertion
+    #[serde(default)]
+    pub not_contains: HashMap<String, String>,
+
+    /// Regex match assertion
+    #[serde(default)]
+    pub regexp: HashMap<String, String>,
+
+    /// Regex not match assertion
+    #[serde(default)]
+    pub not_regexp: HashMap<String, String>,
+
+    /// Range assertion
+    #[serde(default)]
+    pub range: HashMap<String, RangeCondition>,
+
+    /// In list assertion
+    #[serde(default, rename = "in")]
+    pub in_list: HashMap<String, Vec<serde_json::Value>>,
+
+    /// Not in list assertion
+    #[serde(default)]
+    pub not_in: HashMap<String, Vec<serde_json::Value>>,
+}
+
+/// Range condition for assertions
+#[derive(Debug, Clone, Default, Serialize, Deserialize)]
+pub struct RangeCondition {
+    #[serde(default)]
+    pub gte: Option<f64>,
+    #[serde(default)]
+    pub gt: Option<f64>,
+    #[serde(default)]
+    pub lte: Option<f64>,
+    #[serde(default)]
+    pub lt: Option<f64>,
+}
+
+/// Sleep action between requests
+#[derive(Debug, Clone, Default, Serialize, Deserialize)]
+pub struct SleepAction {
+    #[serde(default)]
+    pub sleep_in_milli_seconds: i64,
+}
+
+/// Request item with optional assertions
+#[derive(Debug, Clone, Default, Serialize, Deserialize)]
+pub struct RequestItem {
+    /// The HTTP request
+    #[serde(default)]
+    pub request: Option<Request>,
+
+    /// Assertion conditions
+    #[serde(default)]
+    pub assert: Option<AssertConfig>,
+
+    /// DSL-based assertion
+    #[serde(default)]
+    pub assert_dsl: String,
+
+    /// Sleep action after request
+    #[serde(default)]
+    pub sleep: Option<SleepAction>,
+
+    /// Register response values to global context
+    #[serde(default)]
+    pub register: Vec<HashMap<String, String>>,
+}
+
+/// Runner configuration
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct RunnerConfig {
+    /// How many rounds of requests to run
+    #[serde(default)]
+    pub total_rounds: i64,
+
+    /// Skip warmup round
+    #[serde(default)]
+    pub no_warm: bool,
+
+    /// Valid status codes during warmup
+    #[serde(default)]
+    pub valid_status_codes_during_warmup: Vec<i32>,
+
+    /// Exit(1) if any assertion failed
+    #[serde(default)]
+    pub assert_invalid: bool,
+
+    /// Continue running on assertion failure
+    #[serde(default)]
+    pub continue_on_assert_invalid: bool,
+
+    /// Skip invalid assertions
+    #[serde(default)]
+    pub skip_invalid_assert: bool,
+
+    /// Exit(2) if any error occurred
+    #[serde(default)]
+    pub assert_error: bool,
+
+    /// Log all requests
+    #[serde(default)]
+    pub log_requests: bool,
+
+    /// Benchmark only mode
+    #[serde(default)]
+    pub benchmark_only: bool,
+
+    /// Use microseconds for duration
+    #[serde(default)]
+    pub duration_in_us: bool,
+
+    /// Disable stats collection
+    #[serde(default)]
+    pub no_stats: bool,
+
+    /// Disable size stats
+    #[serde(default)]
+    pub no_size_stats: bool,
+
+    /// Metric sample size for histogram
+    #[serde(default = "default_metric_sample_size")]
+    pub metric_sample_size: usize,
+
+    /// Log requests with these status codes
+    #[serde(default)]
+    pub log_status_codes: Vec<i32>,
+
+    /// Disable header name normalizing
+    #[serde(default)]
+    pub disable_header_names_normalizing: bool,
+
+    /// Reset context before test run
+    #[serde(default)]
+    pub reset_context: bool,
+
+    /// Default endpoint for requests
+    #[serde(default)]
+    pub default_endpoint: String,
+
+    /// Default basic auth for requests
+    #[serde(default)]
+    pub default_basic_auth: Option<BasicAuth>,
+}
+
+fn default_metric_sample_size() -> usize {
+    10000
+}
+
+impl Default for RunnerConfig {
+    fn default() -> Self {
+        Self {
+            total_rounds: -1,
+            no_warm: false,
+            valid_status_codes_during_warmup: vec![],
+            assert_invalid: false,
+            continue_on_assert_invalid: false,
+            skip_invalid_assert: false,
+            assert_error: false,
+            log_requests: false,
+            benchmark_only: false,
+            duration_in_us: false,
+            no_stats: false,
+            no_size_stats: false,
+            metric_sample_size: 10000,
+            log_status_codes: vec![],
+            disable_header_names_normalizing: false,
+            reset_context: false,
+            default_endpoint: String::new(),
+            default_basic_auth: None,
+        }
+    }
+}
+
+/// Test case configuration
+#[derive(Debug, Clone, Default, Serialize, Deserialize)]
+pub struct Test {
+    /// Directory path containing test configurations
+    #[serde(default)]
+    pub path: String,
+
+    /// Whether to use compression
+    #[serde(default)]
+    pub compress: bool,
+}
+
+/// Loader configuration
+#[derive(Debug, Clone, Default, Serialize, Deserialize)]
+pub struct LoaderConfig {
+    /// Variable definitions
+    #[serde(default)]
+    pub variables: Vec<Variable>,
+
+    /// Request definitions
+    #[serde(default)]
+    pub requests: Vec<RequestItem>,
+
+    /// Runner configuration
+    #[serde(default)]
+    pub runner: RunnerConfig,
+}
+
+/// Application configuration
+#[derive(Debug, Clone, Default, Serialize, Deserialize)]
+pub struct AppConfig {
+    /// Environment variables
+    #[serde(default, alias = "env")]
+    pub environments: HashMap<String, String>,
+
+    /// Test cases
+    #[serde(default)]
+    pub tests: Vec<Test>,
+
+    /// Variable definitions
+    #[serde(default)]
+    pub variables: Vec<Variable>,
+
+    /// Request definitions
+    #[serde(default)]
+    pub requests: Vec<RequestItem>,
+
+    /// Runner configuration
+    #[serde(default)]
+    pub runner: RunnerConfig,
+}
+
+impl AppConfig {
+    /// Convert to LoaderConfig
+    pub fn to_loader_config(&self) -> LoaderConfig {
+        LoaderConfig {
+            variables: self.variables.clone(),
+            requests: self.requests.clone(),
+            runner: self.runner.clone(),
+        }
+    }
+
+    /// Check if environment variables exist
+    pub fn test_env(&self, env_vars: &[&str]) -> bool {
+        for env_var in env_vars {
+            match self.environments.get(*env_var) {
+                Some(v) if !v.is_empty() => continue,
+                _ => return false,
+            }
+        }
+        true
+    }
+}
+
+/// Request result for statistics
+#[derive(Debug, Clone, Default)]
+pub struct RequestResult {
+    pub request_count: i32,
+    pub request_size: i64,
+    pub response_size: i64,
+    pub status: i32,
+    pub error: bool,
+    pub invalid: bool,
+    pub duration: std::time::Duration,
+}
+
+impl RequestResult {
+    pub fn reset(&mut self) {
+        self.request_count = 0;
+        self.request_size = 0;
+        self.response_size = 0;
+        self.status = 0;
+        self.error = false;
+        self.invalid = false;
+        self.duration = std::time::Duration::ZERO;
+    }
+}
diff --git a/loadgen-rust/src/config/yaml.rs b/loadgen-rust/src/config/yaml.rs
new file mode 100644
index 0000000..816c3a5
--- /dev/null
+++ b/loadgen-rust/src/config/yaml.rs
@@ -0,0 +1,142 @@
+// Copyright (C) INFINI Labs & INFINI LIMITED.
+//
+// The INFINI Loadgen is offered under the GNU Affero General Public License v3.0
+// and as commercial software.
+//
+// For commercial licensing, contact us at:
+//   - Website: infinilabs.com
+//   - Email: hello@infini.ltd
+//
+// Open Source licensed under AGPL V3:
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+//! YAML configuration loader
+
+use anyhow::{Context, Result};
+use std::path::Path;
+use tracing::debug;
+
+use super::types::AppConfig;
+
+/// Load configuration from a YAML file
+pub async fn load_config(path: &Path) -> Result<AppConfig> {
+    debug!("Loading config from {:?}", path);
+
+    // Check if file exists
+    if !path.exists() {
+        // Return default config if file doesn't exist
+        debug!("Config file not found, using defaults");
+        return Ok(AppConfig::default());
+    }
+
+    // Read file contents
+    let contents = tokio::fs::read_to_string(path)
+        .await
+        .with_context(|| format!("Failed to read config file: {:?}", path))?;
+
+    // Parse YAML
+    let mut config: AppConfig = serde_yaml::from_str(&contents)
+        .with_context(|| format!("Failed to parse config file: {:?}", path))?;
+
+    // Merge system environment variables
+    for (key, value) in std::env::vars() {
+        if config.environments.contains_key(&key) {
+            config.environments.insert(key, value);
+        }
+    }
+
+    debug!("Loaded config with {} requests", config.requests.len());
+    Ok(config)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use std::io::Write;
+    use tempfile::NamedTempFile;
+
+    #[tokio::test]
+    async fn test_load_config_not_found() {
+        let result = load_config(Path::new("nonexistent.yml")).await;
+        assert!(result.is_ok());
+    }
+
+    #[tokio::test]
+    async fn test_load_config_basic() {
+        let mut file = NamedTempFile::new().unwrap();
+        writeln!(
+            file,
+            r#"
+env:
+  TEST_VAR: test_value
+
+runner:
+  no_warm: true
+  total_rounds: 5
+
+variables:
+  - name: test_id
+    type: sequence
+
+requests:
+  - request:
+      method: GET
+      url: http://localhost:8080/test
+"#
+        )
+        .unwrap();
+
+        let result = load_config(file.path()).await;
+        assert!(result.is_ok());
+
+        let config = result.unwrap();
+        assert_eq!(config.environments.get("TEST_VAR"), Some(&"test_value".to_string()));
+        assert!(config.runner.no_warm);
+        assert_eq!(config.runner.total_rounds, 5);
+        assert_eq!(config.variables.len(), 1);
+        assert_eq!(config.requests.len(), 1);
+    }
+
+    #[tokio::test]
+    async fn test_load_config_with_basic_auth() {
+        let mut file = NamedTempFile::new().unwrap();
+        writeln!(
+            file,
+            r#"
+runner:
+  default_basic_auth:
+    username: admin
+    password: secret
+
+requests:
+  - request:
+      method: POST
+      url: http://localhost:8080/api
+      basic_auth:
+        username: user
+        password: pass
+"#
+        )
+        .unwrap();
+
+        let result = load_config(file.path()).await;
+        assert!(result.is_ok());
+
+        let config = result.unwrap();
+        assert!(config.runner.default_basic_auth.is_some());
+        let auth = config.runner.default_basic_auth.unwrap();
+        assert_eq!(auth.username, "admin");
+        assert_eq!(auth.password, "secret");
+    }
+}
diff --git a/loadgen-rust/src/http/client.rs b/loadgen-rust/src/http/client.rs
new file mode 100644
index 0000000..c26277e
--- /dev/null
+++ b/loadgen-rust/src/http/client.rs
@@ -0,0 +1,158 @@
+// Copyright (C) INFINI Labs & INFINI LIMITED.
+//
+// The INFINI Loadgen is offered under the GNU Affero General Public License v3.0
+// and as commercial software.
+//
+// For commercial licensing, contact us at:
+//   - Website: infinilabs.com
+//   - Email: hello@infini.ltd
+//
+// Open Source licensed under AGPL V3:
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+//! HTTP client wrapper for loadgen
+
+use std::time::Duration;
+
+use anyhow::Result;
+use reqwest::{Client, Response};
+use tracing::debug;
+
+/// HTTP client configuration
+#[derive(Debug, Clone)]
+pub struct HttpClientConfig {
+    /// Request timeout in seconds (0 = no timeout)
+    pub timeout: u64,
+    /// Read timeout in seconds
+    pub read_timeout: u64,
+    /// Write timeout in seconds
+    pub write_timeout: u64,
+    /// Dial/connect timeout in seconds
+    pub dial_timeout: u64,
+    /// Enable gzip compression
+    pub compress: bool,
+    /// Disable header name normalization
+    pub disable_header_normalizing: bool,
+    /// Maximum connections per host
+    pub max_connections_per_host: usize,
+    /// User agent string
+    pub user_agent: String,
+}
+
+impl Default for HttpClientConfig {
+    fn default() -> Self {
+        Self {
+            timeout: 0,
+            read_timeout: 0,
+            write_timeout: 0,
+            dial_timeout: 3,
+            compress: false,
+            disable_header_normalizing: false,
+            max_connections_per_host: 100,
+            user_agent: format!("loadgen-rust/{}", env!("CARGO_PKG_VERSION")),
+        }
+    }
+}
+
+/// HTTP client wrapper
+pub struct HttpClient {
+    client: Client,
+    config: HttpClientConfig,
+}
+
+impl HttpClient {
+    /// Create a new HTTP client
+    pub fn new(config: HttpClientConfig) -> Result<Self> {
+        let mut builder = Client::builder()
+            .user_agent(&config.user_agent)
+            .pool_max_idle_per_host(config.max_connections_per_host)
+            .danger_accept_invalid_certs(true) // Match Go's InsecureSkipVerify
+            .use_rustls_tls();
+
+        // Set connect timeout
+        if config.dial_timeout > 0 {
+            builder = builder.connect_timeout(Duration::from_secs(config.dial_timeout));
+        }
+
+        // Set overall timeout
+        let effective_timeout = if config.timeout > 0 {
+            config.timeout
+        } else if config.read_timeout > 0 {
+            config.read_timeout
+        } else {
+            0
+        };
+
+        if effective_timeout > 0 {
+            builder = builder.timeout(Duration::from_secs(effective_timeout));
+        }
+
+        // Enable gzip
+        if config.compress {
+            builder = builder.gzip(true);
+        }
+
+        let client = builder.build()?;
+        debug!("HTTP client created with config: {:?}", config);
+
+        Ok(Self { client, config })
+    }
+
+    /// Get the internal reqwest client
+    pub fn client(&self) -> &Client {
+        &self.client
+    }
+
+    /// Get the client configuration
+    pub fn config(&self) -> &HttpClientConfig {
+        &self.config
+    }
+
+    /// Execute a request and return the response
+    pub async fn execute(&self, request: reqwest::Request) -> Result<Response> {
+        let response = self.client.execute(request).await?;
+        Ok(response)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_default_config() {
+        let config = HttpClientConfig::default();
+        assert_eq!(config.timeout, 0);
+        assert_eq!(config.dial_timeout, 3);
+        assert!(!config.compress);
+    }
+
+    #[tokio::test]
+    async fn test_create_client() {
+        let config = HttpClientConfig::default();
+        let client = HttpClient::new(config);
+        assert!(client.is_ok());
+    }
+
+    #[tokio::test]
+    async fn test_create_client_with_timeout() {
+        let config = HttpClientConfig {
+            timeout: 30,
+            dial_timeout: 5,
+            ..Default::default()
+        };
+        let client = HttpClient::new(config);
+        assert!(client.is_ok());
+    }
+}
diff --git a/loadgen-rust/src/http/mod.rs b/loadgen-rust/src/http/mod.rs
new file mode 100644
index 0000000..35689d3
--- /dev/null
+++ b/loadgen-rust/src/http/mod.rs
@@ -0,0 +1,29 @@
+// Copyright (C) INFINI Labs & INFINI LIMITED.
+//
+// The INFINI Loadgen is offered under the GNU Affero General Public License v3.0
+// and as commercial software.
+//
+// For commercial licensing, contact us at:
+//   - Website: infinilabs.com
+//   - Email: hello@infini.ltd
+//
+// Open Source licensed under AGPL V3:
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+//! HTTP module for loadgen
+
+pub mod client;
+pub mod request;
+
+pub use client::HttpClient;
diff --git a/loadgen-rust/src/http/request.rs b/loadgen-rust/src/http/request.rs
new file mode 100644
index 0000000..d800c57
--- /dev/null
+++ b/loadgen-rust/src/http/request.rs
@@ -0,0 +1,314 @@
+// Copyright (C) INFINI Labs & INFINI LIMITED.
+//
+// The INFINI Loadgen is offered under the GNU Affero General Public License v3.0
+// and as commercial software.
+//
+// For commercial licensing, contact us at:
+//   - Website: infinilabs.com
+//   - Email: hello@infini.ltd
+//
+// Open Source licensed under AGPL V3:
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+//! HTTP request building for loadgen
+
+use std::collections::HashMap;
+use std::io::Write;
+
+use anyhow::{Context, Result};
+use flate2::write::GzEncoder;
+use flate2::Compression;
+use reqwest::header::{HeaderMap, HeaderName, HeaderValue, ACCEPT_ENCODING, CONTENT_ENCODING};
+use reqwest::{Body, Method, Url};
+use tracing::debug;
+
+use crate::config::types::{Request, RequestItem, RunnerConfig};
+use crate::template::TemplateEngine;
+use crate::variable::provider::VariableProvider;
+
+/// Request builder for loadgen
+pub struct RequestBuilder<'a> {
+    provider: &'a VariableProvider,
+    runner_config: &'a RunnerConfig,
+    compress: bool,
+}
+
+impl<'a> RequestBuilder<'a> {
+    /// Create a new request builder
+    pub fn new(
+        provider: &'a VariableProvider,
+        runner_config: &'a RunnerConfig,
+        compress: bool,
+    ) -> Self {
+        Self {
+            provider,
+            runner_config,
+            compress,
+        }
+    }
+
+    /// Build a reqwest Request from a RequestItem
+    pub fn build(
+        &self,
+        item: &RequestItem,
+        runtime_vars: &mut HashMap<String, String>,
+        client: &reqwest::Client,
+    ) -> Result<reqwest::Request> {
+        let request = item.request.as_ref().context("Request is None")?;
+
+        // Process runtime variables
+        for (key, var_name) in &request.runtime_variables {
+            let value = self.provider.get_value(var_name, Some(runtime_vars));
+            runtime_vars.insert(key.clone(), value);
+        }
+
+        // Build URL
+        let url = self.build_url(request, runtime_vars)?;
+        debug!("Request URL: {}", url);
+
+        // Get method
+        let method = self.parse_method(&request.method)?;
+
+        // Start building request
+        let mut builder = client.request(method, url);
+
+        // Set basic auth
+        builder = self.set_basic_auth(builder, request);
+
+        // Build headers
+        builder = self.set_headers(builder, request, runtime_vars)?;
+
+        // Build body
+        if !request.body.is_empty() {
+            let body = self.build_body(request, runtime_vars)?;
+            
+            if self.compress && !body.is_empty() {
+                // Compress body
+                let mut encoder = GzEncoder::new(Vec::new(), Compression::best());
+                encoder.write_all(body.as_bytes())?;
+                let compressed = encoder.finish()?;
+                
+                builder = builder
+                    .header(CONTENT_ENCODING, "gzip")
+                    .header(ACCEPT_ENCODING, "gzip")
+                    .header("X-PayLoad-Compressed", "true")
+                    .body(Body::from(compressed));
+            } else {
+                builder = builder.body(Body::from(body.clone()));
+            }
+            
+            builder = builder.header("X-PayLoad-Size", body.len().to_string());
+        }
+
+        builder.build().context("Failed to build request")
+    }
+
+    /// Build the URL with template substitution
+    fn build_url(
+        &self,
+        request: &Request,
+        runtime_vars: &HashMap<String, String>,
+    ) -> Result<Url> {
+        let url_str = if TemplateEngine::has_template(&request.url) {
+            TemplateEngine::execute(&request.url, |var| {
+                self.provider.get_value(var, Some(runtime_vars))
+            })
+        } else {
+            request.url.clone()
+        };
+
+        // If URL doesn't have a host, use default endpoint
+        if url_str.starts_with('/') {
+            if self.runner_config.default_endpoint.is_empty() {
+                anyhow::bail!("URL is relative but no default_endpoint configured: {}", url_str);
+            }
+            let full_url = format!("{}{}", self.runner_config.default_endpoint.trim_end_matches('/'), url_str);
+            Url::parse(&full_url).context("Failed to parse URL with default endpoint")
+        } else {
+            Url::parse(&url_str).context("Failed to parse URL")
+        }
+    }
+
+    /// Parse HTTP method
+    fn parse_method(&self, method: &str) -> Result<Method> {
+        match method.to_uppercase().as_str() {
+            "GET" => Ok(Method::GET),
+            "POST" => Ok(Method::POST),
+            "PUT" => Ok(Method::PUT),
+            "DELETE" => Ok(Method::DELETE),
+            "PATCH" => Ok(Method::PATCH),
+            "HEAD" => Ok(Method::HEAD),
+            "OPTIONS" => Ok(Method::OPTIONS),
+            _ => anyhow::bail!("Unsupported HTTP method: {}", method),
+        }
+    }
+
+    /// Set basic auth on request
+    fn set_basic_auth(
+        &self,
+        mut builder: reqwest::RequestBuilder,
+        request: &Request,
+    ) -> reqwest::RequestBuilder {
+        // Check request-level auth first
+        if let Some(ref auth) = request.basic_auth {
+            if !auth.username.is_empty() {
+                builder = builder.basic_auth(&auth.username, Some(&auth.password));
+                return builder;
+            }
+        }
+
+        // Fall back to default auth
+        if let Some(ref auth) = self.runner_config.default_basic_auth {
+            if !auth.username.is_empty() {
+                builder = builder.basic_auth(&auth.username, Some(&auth.password));
+            }
+        }
+
+        builder
+    }
+
+    /// Set headers on request
+    fn set_headers(
+        &self,
+        mut builder: reqwest::RequestBuilder,
+        request: &Request,
+        runtime_vars: &HashMap<String, String>,
+    ) -> Result<reqwest::RequestBuilder> {
+        let mut headers = HeaderMap::new();
+
+        for header_map in &request.headers {
+            for (key, value) in header_map {
+                let header_value = if TemplateEngine::has_template(value) {
+                    TemplateEngine::execute(value, |var| {
+                        self.provider.get_value(var, Some(runtime_vars))
+                    })
+                } else {
+                    value.clone()
+                };
+
+                let name = HeaderName::try_from(key.as_str())
+                    .context(format!("Invalid header name: {}", key))?;
+                let value = HeaderValue::from_str(&header_value)
+                    .context(format!("Invalid header value: {}", header_value))?;
+                headers.insert(name, value);
+            }
+        }
+
+        builder = builder.headers(headers);
+        Ok(builder)
+    }
+
+    /// Build request body with template substitution and body repetition
+    fn build_body(
+        &self,
+        request: &Request,
+        runtime_vars: &mut HashMap<String, String>,
+    ) -> Result<String> {
+        let repeat_times = if request.repeat_body_n_times > 0 {
+            request.repeat_body_n_times as usize
+        } else {
+            1
+        };
+
+        let mut result = String::new();
+
+        for _ in 0..repeat_times {
+            // Process runtime body line variables for each repetition
+            for (key, var_name) in &request.runtime_body_line_variables {
+                let value = self.provider.get_value(var_name, Some(runtime_vars));
+                runtime_vars.insert(key.clone(), value);
+            }
+
+            let body = if TemplateEngine::has_template(&request.body) {
+                TemplateEngine::execute(&request.body, |var| {
+                    self.provider.get_value(var, Some(runtime_vars))
+                })
+            } else {
+                request.body.clone()
+            };
+
+            result.push_str(&body);
+        }
+
+        Ok(result)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_parse_method() {
+        let provider = VariableProvider::new(&[], HashMap::new());
+        let runner_config = RunnerConfig::default();
+        let builder = RequestBuilder::new(&provider, &runner_config, false);
+
+        assert_eq!(builder.parse_method("GET").unwrap(), Method::GET);
+        assert_eq!(builder.parse_method("post").unwrap(), Method::POST);
+        assert_eq!(builder.parse_method("Put").unwrap(), Method::PUT);
+        assert!(builder.parse_method("INVALID").is_err());
+    }
+
+    #[test]
+    fn test_build_url_absolute() {
+        let provider = VariableProvider::new(&[], HashMap::new());
+        let runner_config = RunnerConfig::default();
+        let builder = RequestBuilder::new(&provider, &runner_config, false);
+
+        let request = Request {
+            url: "http://localhost:9200/test".to_string(),
+            ..Default::default()
+        };
+
+        let url = builder.build_url(&request, &HashMap::new()).unwrap();
+        assert_eq!(url.to_string(), "http://localhost:9200/test");
+    }
+
+    #[test]
+    fn test_build_url_relative() {
+        let provider = VariableProvider::new(&[], HashMap::new());
+        let runner_config = RunnerConfig {
+            default_endpoint: "http://localhost:9200".to_string(),
+            ..Default::default()
+        };
+        let builder = RequestBuilder::new(&provider, &runner_config, false);
+
+        let request = Request {
+            url: "/test/_search".to_string(),
+            ..Default::default()
+        };
+
+        let url = builder.build_url(&request, &HashMap::new()).unwrap();
+        assert_eq!(url.to_string(), "http://localhost:9200/test/_search");
+    }
+
+    #[test]
+    fn test_build_url_with_template() {
+        let mut env_vars = HashMap::new();
+        env_vars.insert("ES_ENDPOINT".to_string(), "http://localhost:9200".to_string());
+        
+        let provider = VariableProvider::new(&[], env_vars);
+        let runner_config = RunnerConfig::default();
+        let builder = RequestBuilder::new(&provider, &runner_config, false);
+
+        let request = Request {
+            url: "$[[env.ES_ENDPOINT]]/test".to_string(),
+            ..Default::default()
+        };
+
+        let url = builder.build_url(&request, &HashMap::new()).unwrap();
+        assert_eq!(url.to_string(), "http://localhost:9200/test");
+    }
+}
diff --git a/loadgen-rust/src/lib.rs b/loadgen-rust/src/lib.rs
new file mode 100644
index 0000000..eda365e
--- /dev/null
+++ b/loadgen-rust/src/lib.rs
@@ -0,0 +1,39 @@
+// Copyright (C) INFINI Labs & INFINI LIMITED.
+//
+// The INFINI Loadgen is offered under the GNU Affero General Public License v3.0
+// and as commercial software.
+//
+// For commercial licensing, contact us at:
+//   - Website: infinilabs.com
+//   - Email: hello@infini.ltd
+//
+// Open Source licensed under AGPL V3:
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+//! INFINI Loadgen - A high-performance HTTP load generator and testing suite
+//!
+//! This is a Rust implementation of the loadgen tool, supporting the same
+//! YAML configuration and DSL formats as the original Go implementation.
+
+pub mod assertion;
+pub mod config;
+pub mod http;
+pub mod loader;
+pub mod runner;
+pub mod template;
+pub mod variable;
+
+pub use config::types::{AppConfig, LoaderConfig, RunnerConfig};
+pub use loader::generator::LoadGenerator;
+pub use loader::stats::LoadStats;
diff --git a/loadgen-rust/src/loader/generator.rs b/loadgen-rust/src/loader/generator.rs
new file mode 100644
index 0000000..b9ad4cb
--- /dev/null
+++ b/loadgen-rust/src/loader/generator.rs
@@ -0,0 +1,288 @@
+// Copyright (C) INFINI Labs & INFINI LIMITED.
+//
+// The INFINI Loadgen is offered under the GNU Affero General Public License v3.0
+// and as commercial software.
+//
+// For commercial licensing, contact us at:
+//   - Website: infinilabs.com
+//   - Email: hello@infini.ltd
+//
+// Open Source licensed under AGPL V3:
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+//! Load generator - orchestrates workers and aggregates statistics
+
+use std::collections::HashMap;
+use std::sync::atomic::AtomicBool;
+use std::sync::Arc;
+use std::time::{Duration, Instant};
+
+use anyhow::Result;
+use tokio::task::JoinSet;
+use tracing::{error, info, warn};
+
+use super::stats::{AggregatedStats, LoadStats};
+use super::worker::{Worker, WorkerConfig};
+use crate::config::types::LoaderConfig;
+use crate::http::client::{HttpClient, HttpClientConfig};
+use crate::http::request::RequestBuilder;
+use crate::variable::provider::VariableProvider;
+
+/// CLI options passed to the generator
+#[derive(Debug, Clone)]
+pub struct CliOptions {
+    /// Number of concurrent workers
+    pub concurrency: usize,
+    /// Duration in seconds
+    pub duration: u64,
+    /// Rate limit (requests per second)
+    pub rate_limit: i64,
+    /// Total request limit
+    pub request_limit: i64,
+    /// Request timeout
+    pub timeout: u64,
+    /// Read timeout
+    pub read_timeout: u64,
+    /// Write timeout
+    pub write_timeout: u64,
+    /// Dial timeout
+    pub dial_timeout: u64,
+    /// Enable compression
+    pub compress: bool,
+    /// Total rounds
+    pub total_rounds: i64,
+    /// Debug mode
+    pub debug: bool,
+}
+
+impl Default for CliOptions {
+    fn default() -> Self {
+        Self {
+            concurrency: 1,
+            duration: 5,
+            rate_limit: -1,
+            request_limit: -1,
+            timeout: 0,
+            read_timeout: 0,
+            write_timeout: 0,
+            dial_timeout: 3,
+            compress: false,
+            total_rounds: -1,
+            debug: false,
+        }
+    }
+}
+
+/// Load generator
+pub struct LoadGenerator {
+    config: LoaderConfig,
+    options: CliOptions,
+    interrupted: Arc<AtomicBool>,
+    http_client: Arc<HttpClient>,
+    provider: Arc<VariableProvider>,
+}
+
+impl LoadGenerator {
+    /// Create a new load generator
+    pub fn new(
+        config: LoaderConfig,
+        options: CliOptions,
+        interrupted: Arc<AtomicBool>,
+    ) -> Result<Self> {
+        // Create HTTP client
+        let http_config = HttpClientConfig {
+            timeout: options.timeout,
+            read_timeout: options.read_timeout,
+            write_timeout: options.write_timeout,
+            dial_timeout: options.dial_timeout,
+            compress: options.compress,
+            disable_header_normalizing: config.runner.disable_header_names_normalizing,
+            max_connections_per_host: options.concurrency,
+            ..Default::default()
+        };
+        let http_client = Arc::new(HttpClient::new(http_config)?);
+
+        // Create variable provider with environment variables
+        let env_vars: HashMap<String, String> = std::env::vars().collect();
+        let provider = Arc::new(VariableProvider::new(&config.variables, env_vars));
+
+        Ok(Self {
+            config,
+            options,
+            interrupted,
+            http_client,
+            provider,
+        })
+    }
+
+    /// Run the load generator
+    pub async fn run(&mut self) -> Result<AggregatedStats> {
+        // Override total_rounds from CLI if specified
+        let total_rounds = if self.options.total_rounds > 0 {
+            self.options.total_rounds
+        } else {
+            self.config.runner.total_rounds
+        };
+
+        // Warmup phase
+        if !self.config.runner.no_warm {
+            self.warmup().await?;
+        }
+
+        // Calculate request limit per worker
+        let request_limit = self.options.request_limit;
+        let concurrency = if request_limit > 0 && (request_limit as usize) < self.options.concurrency {
+            request_limit as usize
+        } else {
+            self.options.concurrency
+        };
+
+        let requests_per_worker = if request_limit > 0 {
+            (request_limit + concurrency as i64 - 1) / concurrency as i64
+        } else {
+            -1
+        };
+
+        // Create shared stats
+        let stats = Arc::new(LoadStats::new());
+
+        // Start wall clock
+        let wall_start = Instant::now();
+
+        // Spawn workers
+        let mut tasks = JoinSet::new();
+
+        for i in 0..concurrency {
+            let worker_request_limit = if requests_per_worker > 0 {
+                let remaining = request_limit - (i as i64 * requests_per_worker);
+                remaining.min(requests_per_worker)
+            } else {
+                -1
+            };
+
+            let worker_config = WorkerConfig {
+                duration: Duration::from_secs(self.options.duration),
+                request_limit: worker_request_limit,
+                rate_limit: self.options.rate_limit,
+                total_rounds,
+                compress: self.options.compress,
+                debug: self.options.debug,
+            };
+
+            let worker = Worker::new(
+                self.config.clone(),
+                worker_config,
+                Arc::clone(&self.http_client),
+                Arc::clone(&self.provider),
+                Arc::clone(&stats),
+                Arc::clone(&self.interrupted),
+            );
+
+            tasks.spawn(async move {
+                if let Err(e) = worker.run().await {
+                    error!("Worker error: {}", e);
+                }
+            });
+        }
+
+        // Wait for all workers to complete
+        while let Some(result) = tasks.join_next().await {
+            if let Err(e) = result {
+                error!("Worker task panicked: {}", e);
+            }
+        }
+
+        let wall_time = wall_start.elapsed();
+
+        // Aggregate and print stats
+        let aggregated = AggregatedStats::from(stats.as_ref());
+        
+        if aggregated.num_requests == 0 {
+            error!("Error: No statistics collected / no requests found");
+        } else {
+            aggregated.print(wall_time, &self.config.runner);
+        }
+
+        Ok(aggregated)
+    }
+
+    /// Run warmup phase
+    async fn warmup(&self) -> Result<()> {
+        info!("warmup started");
+
+        let global_ctx: HashMap<String, String> = HashMap::new();
+
+        for item in &self.config.requests {
+            let _request = match &item.request {
+                Some(r) => r,
+                None => continue,
+            };
+
+            // Build request
+            let mut runtime_vars = global_ctx.clone();
+            let request_builder = RequestBuilder::new(
+                &self.provider,
+                &self.config.runner,
+                self.options.compress,
+            );
+
+            let req = match request_builder.build(item, &mut runtime_vars, self.http_client.client()) {
+                Ok(r) => r,
+                Err(e) => {
+                    error!("Failed to build warmup request: {}", e);
+                    continue;
+                }
+            };
+
+            info!("[{}] {}", req.method(), req.url());
+
+            // Execute request
+            let start = Instant::now();
+            let response = self.http_client.execute(req).await;
+            let duration = start.elapsed();
+
+            match response {
+                Ok(resp) => {
+                    let status = resp.status().as_u16() as i32;
+                    let body = resp.text().await.unwrap_or_default();
+                    
+                    info!(
+                        "status: {}, duration: {:?}, response: {}",
+                        status,
+                        duration,
+                        if body.len() > 512 { &body[..512] } else { &body }
+                    );
+
+                    // Check if status indicates failure
+                    let is_valid = self.config.runner.valid_status_codes_during_warmup.is_empty()
+                        || self.config.runner.valid_status_codes_during_warmup.contains(&status);
+
+                    if !is_valid && (status >= 400 || status == 0) {
+                        warn!(
+                            "Warmup request returned status {}, are you sure to continue?",
+                            status
+                        );
+                    }
+                }
+                Err(e) => {
+                    error!("Warmup request failed: {}", e);
+                    warn!("Warmup request failed, are you sure to continue?");
+                }
+            }
+        }
+
+        info!("warmup finished");
+        Ok(())
+    }
+}
diff --git a/loadgen-rust/src/loader/mod.rs b/loadgen-rust/src/loader/mod.rs
new file mode 100644
index 0000000..e7f9f0e
--- /dev/null
+++ b/loadgen-rust/src/loader/mod.rs
@@ -0,0 +1,28 @@
+// Copyright (C) INFINI Labs & INFINI LIMITED.
+//
+// The INFINI Loadgen is offered under the GNU Affero General Public License v3.0
+// and as commercial software.
+//
+// For commercial licensing, contact us at:
+//   - Website: infinilabs.com
+//   - Email: hello@infini.ltd
+//
+// Open Source licensed under AGPL V3:
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+//! Loader module for loadgen
+
+pub mod generator;
+pub mod stats;
+pub mod worker;
diff --git a/loadgen-rust/src/loader/stats.rs b/loadgen-rust/src/loader/stats.rs
new file mode 100644
index 0000000..a4296f0
--- /dev/null
+++ b/loadgen-rust/src/loader/stats.rs
@@ -0,0 +1,375 @@
+// Copyright (C) INFINI Labs & INFINI LIMITED.
+//
+// The INFINI Loadgen is offered under the GNU Affero General Public License v3.0
+// and as commercial software.
+//
+// For commercial licensing, contact us at:
+//   - Website: infinilabs.com
+//   - Email: hello@infini.ltd
+//
+// Open Source licensed under AGPL V3:
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+//! Load statistics collection
+
+use std::collections::HashMap;
+use std::sync::atomic::{AtomicI64, AtomicU64, Ordering};
+use std::time::Duration;
+
+use bytesize::ByteSize;
+use hdrhistogram::Histogram;
+use parking_lot::Mutex;
+
+/// Statistics collected during load generation
+#[derive(Debug)]
+pub struct LoadStats {
+    /// Total request size in bytes
+    pub total_request_size: AtomicI64,
+    /// Total response size in bytes
+    pub total_response_size: AtomicI64,
+    /// Total duration of all requests
+    pub total_duration: AtomicU64,
+    /// Minimum request time
+    pub min_request_time: AtomicU64,
+    /// Maximum request time
+    pub max_request_time: AtomicU64,
+    /// Number of requests completed
+    pub num_requests: AtomicU64,
+    /// Number of errors
+    pub num_errors: AtomicU64,
+    /// Number of invalid assertions
+    pub num_assert_invalid: AtomicU64,
+    /// Number of skipped assertions
+    pub num_assert_skipped: AtomicU64,
+    /// Status code counts
+    pub status_codes: Mutex<HashMap<i32, u64>>,
+    /// Latency histogram
+    pub histogram: Mutex<Histogram<u64>>,
+}
+
+impl Default for LoadStats {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+impl LoadStats {
+    /// Create new empty statistics
+    pub fn new() -> Self {
+        Self {
+            total_request_size: AtomicI64::new(0),
+            total_response_size: AtomicI64::new(0),
+            total_duration: AtomicU64::new(0),
+            min_request_time: AtomicU64::new(u64::MAX),
+            max_request_time: AtomicU64::new(0),
+            num_requests: AtomicU64::new(0),
+            num_errors: AtomicU64::new(0),
+            num_assert_invalid: AtomicU64::new(0),
+            num_assert_skipped: AtomicU64::new(0),
+            status_codes: Mutex::new(HashMap::new()),
+            histogram: Mutex::new(Histogram::new(3).unwrap()),
+        }
+    }
+
+    /// Record a request result
+    pub fn record(
+        &self,
+        duration: Duration,
+        request_size: i64,
+        response_size: i64,
+        status: i32,
+        is_error: bool,
+    ) {
+        let duration_us = duration.as_micros() as u64;
+
+        self.num_requests.fetch_add(1, Ordering::Relaxed);
+        self.total_duration.fetch_add(duration_us, Ordering::Relaxed);
+        self.total_request_size.fetch_add(request_size, Ordering::Relaxed);
+        self.total_response_size.fetch_add(response_size, Ordering::Relaxed);
+
+        // Update min/max atomically
+        let mut current_min = self.min_request_time.load(Ordering::Relaxed);
+        while duration_us < current_min {
+            match self.min_request_time.compare_exchange_weak(
+                current_min,
+                duration_us,
+                Ordering::SeqCst,
+                Ordering::Relaxed,
+            ) {
+                Ok(_) => break,
+                Err(x) => current_min = x,
+            }
+        }
+
+        let mut current_max = self.max_request_time.load(Ordering::Relaxed);
+        while duration_us > current_max {
+            match self.max_request_time.compare_exchange_weak(
+                current_max,
+                duration_us,
+                Ordering::SeqCst,
+                Ordering::Relaxed,
+            ) {
+                Ok(_) => break,
+                Err(x) => current_max = x,
+            }
+        }
+
+        // Update status codes
+        {
+            let mut codes = self.status_codes.lock();
+            *codes.entry(status).or_insert(0) += 1;
+        }
+
+        // Update histogram
+        {
+            let mut hist = self.histogram.lock();
+            let _ = hist.record(duration_us);
+        }
+
+        if is_error {
+            self.num_errors.fetch_add(1, Ordering::Relaxed);
+        }
+    }
+
+    /// Record an assertion failure
+    pub fn record_assert_invalid(&self) {
+        self.num_assert_invalid.fetch_add(1, Ordering::Relaxed);
+    }
+
+    /// Record a skipped assertion
+    pub fn record_assert_skipped(&self) {
+        self.num_assert_skipped.fetch_add(1, Ordering::Relaxed);
+    }
+
+    /// Merge another stats instance into this one
+    pub fn merge(&self, other: &LoadStats) {
+        self.total_request_size.fetch_add(
+            other.total_request_size.load(Ordering::Relaxed),
+            Ordering::Relaxed,
+        );
+        self.total_response_size.fetch_add(
+            other.total_response_size.load(Ordering::Relaxed),
+            Ordering::Relaxed,
+        );
+        self.total_duration.fetch_add(
+            other.total_duration.load(Ordering::Relaxed),
+            Ordering::Relaxed,
+        );
+        self.num_requests.fetch_add(
+            other.num_requests.load(Ordering::Relaxed),
+            Ordering::Relaxed,
+        );
+        self.num_errors.fetch_add(
+            other.num_errors.load(Ordering::Relaxed),
+            Ordering::Relaxed,
+        );
+        self.num_assert_invalid.fetch_add(
+            other.num_assert_invalid.load(Ordering::Relaxed),
+            Ordering::Relaxed,
+        );
+        self.num_assert_skipped.fetch_add(
+            other.num_assert_skipped.load(Ordering::Relaxed),
+            Ordering::Relaxed,
+        );
+
+        // Merge min
+        let other_min = other.min_request_time.load(Ordering::Relaxed);
+        let mut current_min = self.min_request_time.load(Ordering::Relaxed);
+        while other_min < current_min {
+            match self.min_request_time.compare_exchange_weak(
+                current_min,
+                other_min,
+                Ordering::SeqCst,
+                Ordering::Relaxed,
+            ) {
+                Ok(_) => break,
+                Err(x) => current_min = x,
+            }
+        }
+
+        // Merge max
+        let other_max = other.max_request_time.load(Ordering::Relaxed);
+        let mut current_max = self.max_request_time.load(Ordering::Relaxed);
+        while other_max > current_max {
+            match self.max_request_time.compare_exchange_weak(
+                current_max,
+                other_max,
+                Ordering::SeqCst,
+                Ordering::Relaxed,
+            ) {
+                Ok(_) => break,
+                Err(x) => current_max = x,
+            }
+        }
+
+        // Merge status codes
+        {
+            let other_codes = other.status_codes.lock();
+            let mut self_codes = self.status_codes.lock();
+            for (k, v) in other_codes.iter() {
+                *self_codes.entry(*k).or_insert(0) += v;
+            }
+        }
+
+        // Merge histogram
+        {
+            let other_hist = other.histogram.lock();
+            let mut self_hist = self.histogram.lock();
+            let _ = self_hist.add(&*other_hist);
+        }
+    }
+}
+
+/// Final aggregated statistics for display
+pub struct AggregatedStats {
+    pub num_requests: u64,
+    pub num_errors: u64,
+    pub num_assert_invalid: u64,
+    pub num_assert_skipped: u64,
+    pub total_request_size: i64,
+    pub total_response_size: i64,
+    pub min_request_time: Duration,
+    pub max_request_time: Duration,
+    pub avg_request_time: Duration,
+    pub total_duration: Duration,
+    pub status_codes: HashMap<i32, u64>,
+    pub p50: Duration,
+    pub p75: Duration,
+    pub p95: Duration,
+    pub p99: Duration,
+    pub p999: Duration,
+}
+
+impl From<&LoadStats> for AggregatedStats {
+    fn from(stats: &LoadStats) -> Self {
+        let num_requests = stats.num_requests.load(Ordering::Relaxed);
+        let total_duration_us = stats.total_duration.load(Ordering::Relaxed);
+        let min_us = stats.min_request_time.load(Ordering::Relaxed);
+        let max_us = stats.max_request_time.load(Ordering::Relaxed);
+
+        let histogram = stats.histogram.lock();
+
+        AggregatedStats {
+            num_requests,
+            num_errors: stats.num_errors.load(Ordering::Relaxed),
+            num_assert_invalid: stats.num_assert_invalid.load(Ordering::Relaxed),
+            num_assert_skipped: stats.num_assert_skipped.load(Ordering::Relaxed),
+            total_request_size: stats.total_request_size.load(Ordering::Relaxed),
+            total_response_size: stats.total_response_size.load(Ordering::Relaxed),
+            min_request_time: Duration::from_micros(if min_us == u64::MAX { 0 } else { min_us }),
+            max_request_time: Duration::from_micros(max_us),
+            avg_request_time: if num_requests > 0 {
+                Duration::from_micros(total_duration_us / num_requests)
+            } else {
+                Duration::ZERO
+            },
+            total_duration: Duration::from_micros(total_duration_us),
+            status_codes: stats.status_codes.lock().clone(),
+            p50: Duration::from_micros(histogram.value_at_quantile(0.50)),
+            p75: Duration::from_micros(histogram.value_at_quantile(0.75)),
+            p95: Duration::from_micros(histogram.value_at_quantile(0.95)),
+            p99: Duration::from_micros(histogram.value_at_quantile(0.99)),
+            p999: Duration::from_micros(histogram.value_at_quantile(0.999)),
+        }
+    }
+}
+
+impl AggregatedStats {
+    /// Print statistics in the format matching the Go implementation
+    pub fn print(&self, wall_time: Duration, config: &crate::config::types::RunnerConfig) {
+        let req_rate = self.num_requests as f64 / wall_time.as_secs_f64();
+        let req_bytes_rate = self.total_request_size as f64 / wall_time.as_secs_f64();
+        let total_bytes_rate = (self.total_request_size + self.total_response_size) as f64 
+            / wall_time.as_secs_f64();
+
+        // Summary line
+        if config.no_size_stats {
+            println!(
+                "\n{} requests finished in {:?}",
+                self.num_requests, wall_time
+            );
+        } else {
+            println!(
+                "\n{} requests finished in {:?}, {} sent, {} received",
+                self.num_requests,
+                wall_time,
+                ByteSize::b(self.total_request_size as u64),
+                ByteSize::b(self.total_response_size as u64)
+            );
+        }
+
+        // Client metrics
+        println!("\n[Loadgen Client Metrics]");
+        println!("Requests/sec:\t\t{:.2}", req_rate);
+
+        if !config.benchmark_only && !config.no_size_stats {
+            println!("Request Traffic/sec:\t{}/s", ByteSize::b(req_bytes_rate as u64));
+            println!("Total Transfer/sec:\t{}/s", ByteSize::b(total_bytes_rate as u64));
+        }
+
+        println!("Fastest Request:\t{:?}", self.min_request_time);
+        println!("Slowest Request:\t{:?}", self.max_request_time);
+
+        if config.assert_error {
+            println!("Number of Errors:\t{}", self.num_errors);
+        }
+
+        if config.assert_invalid {
+            println!("Assert Invalid:\t\t{}", self.num_assert_invalid);
+            println!("Assert Skipped:\t\t{}", self.num_assert_skipped);
+        }
+
+        // Status codes
+        let mut sorted_codes: Vec<_> = self.status_codes.iter().collect();
+        sorted_codes.sort_by_key(|(k, _)| *k);
+        for (code, count) in sorted_codes {
+            println!("Status {}:\t\t{}", code, count);
+        }
+
+        // Latency metrics
+        if !config.benchmark_only && !config.no_stats {
+            println!("\n[Latency Metrics]");
+            println!(
+                "{} samples of {} events",
+                self.num_requests, self.num_requests
+            );
+            println!("Avg:\t\t{:?}", self.avg_request_time);
+            println!("p50:\t\t{:?}", self.p50);
+            println!("p75:\t\t{:?}", self.p75);
+            println!("p95:\t\t{:?}", self.p95);
+            println!("p99:\t\t{:?}", self.p99);
+            println!("p999:\t\t{:?}", self.p999);
+            println!("Max:\t\t{:?}", self.max_request_time);
+            println!("Min:\t\t{:?}", self.min_request_time);
+        }
+
+        // Estimated server metrics
+        println!("\n[Estimated Server Metrics]");
+        let server_req_rate = if self.total_duration.as_secs_f64() > 0.0 {
+            self.num_requests as f64 / self.total_duration.as_secs_f64()
+        } else {
+            0.0
+        };
+        println!("Requests/sec:\t\t{:.2}", server_req_rate);
+        println!("Avg Req Time:\t\t{:?}", self.avg_request_time);
+
+        if !config.benchmark_only && !config.no_size_stats {
+            let server_bytes_rate = (self.total_request_size + self.total_response_size) as f64
+                / self.total_duration.as_secs_f64();
+            println!("Transfer/sec:\t\t{}/s", ByteSize::b(server_bytes_rate as u64));
+        }
+
+        println!();
+    }
+}
diff --git a/loadgen-rust/src/loader/worker.rs b/loadgen-rust/src/loader/worker.rs
new file mode 100644
index 0000000..90afd26
--- /dev/null
+++ b/loadgen-rust/src/loader/worker.rs
@@ -0,0 +1,345 @@
+// Copyright (C) INFINI Labs & INFINI LIMITED.
+//
+// The INFINI Loadgen is offered under the GNU Affero General Public License v3.0
+// and as commercial software.
+//
+// For commercial licensing, contact us at:
+//   - Website: infinilabs.com
+//   - Email: hello@infini.ltd
+//
+// Open Source licensed under AGPL V3:
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+//! Worker task for executing requests
+
+use std::collections::HashMap;
+use std::num::NonZeroU32;
+use std::sync::atomic::{AtomicBool, Ordering};
+use std::sync::Arc;
+use std::time::{Duration, Instant};
+
+use anyhow::Result;
+use governor::{Quota, RateLimiter};
+use tokio::time::sleep;
+use tracing::{debug, error, info, warn};
+
+use super::stats::LoadStats;
+use crate::assertion::conditions::AssertionChecker;
+use crate::config::types::{LoaderConfig, RequestItem};
+use crate::http::client::HttpClient;
+use crate::http::request::RequestBuilder;
+use crate::variable::provider::VariableProvider;
+
+/// Worker configuration
+pub struct WorkerConfig {
+    /// Maximum duration for the worker to run
+    pub duration: Duration,
+    /// Maximum number of requests to send (-1 = unlimited)
+    pub request_limit: i64,
+    /// Rate limit (requests per second, -1 = unlimited)
+    pub rate_limit: i64,
+    /// Total number of rounds to run (-1 = unlimited)
+    pub total_rounds: i64,
+    /// Enable compression
+    pub compress: bool,
+    /// Debug mode
+    pub debug: bool,
+}
+
+/// Worker for executing HTTP requests
+pub struct Worker {
+    config: LoaderConfig,
+    worker_config: WorkerConfig,
+    http_client: Arc<HttpClient>,
+    provider: Arc<VariableProvider>,
+    stats: Arc<LoadStats>,
+    interrupted: Arc<AtomicBool>,
+    rate_limiter: Option<Arc<RateLimiter<governor::state::NotKeyed, governor::state::InMemoryState, governor::clock::DefaultClock>>>,
+}
+
+impl Worker {
+    /// Create a new worker
+    pub fn new(
+        config: LoaderConfig,
+        worker_config: WorkerConfig,
+        http_client: Arc<HttpClient>,
+        provider: Arc<VariableProvider>,
+        stats: Arc<LoadStats>,
+        interrupted: Arc<AtomicBool>,
+    ) -> Self {
+        // Create rate limiter if needed
+        let rate_limiter = if worker_config.rate_limit > 0 {
+            let rate = NonZeroU32::new(worker_config.rate_limit as u32)
+                .unwrap_or(NonZeroU32::new(1).unwrap());
+            let quota = Quota::per_second(rate);
+            Some(Arc::new(RateLimiter::direct(quota)))
+        } else {
+            None
+        };
+
+        Self {
+            config,
+            worker_config,
+            http_client,
+            provider,
+            stats,
+            interrupted,
+            rate_limiter,
+        }
+    }
+
+    /// Run the worker
+    pub async fn run(&self) -> Result<()> {
+        let start = Instant::now();
+        let mut total_requests = 0i64;
+        let mut total_rounds = 0i64;
+        let mut global_ctx: HashMap<String, String> = HashMap::new();
+
+        loop {
+            // Check if interrupted
+            if self.interrupted.load(Ordering::Relaxed) {
+                debug!("Worker interrupted");
+                break;
+            }
+
+            // Check duration limit
+            if start.elapsed() >= self.worker_config.duration {
+                debug!("Duration limit reached");
+                break;
+            }
+
+            // Check rounds limit
+            if self.worker_config.total_rounds > 0 && total_rounds >= self.worker_config.total_rounds {
+                debug!("Rounds limit reached");
+                break;
+            }
+
+            total_rounds += 1;
+
+            // Execute all requests in the config
+            for item in &self.config.requests {
+                // Check request limit
+                if self.worker_config.request_limit > 0 
+                    && total_requests >= self.worker_config.request_limit 
+                {
+                    debug!("Request limit reached");
+                    return Ok(());
+                }
+
+                // Rate limiting
+                if let Some(ref limiter) = self.rate_limiter {
+                    while limiter.check().is_err() {
+                        if self.interrupted.load(Ordering::Relaxed) {
+                            return Ok(());
+                        }
+                        sleep(Duration::from_millis(10)).await;
+                    }
+                }
+
+                // Execute request
+                let continue_next = self.execute_request(item, &mut global_ctx).await?;
+                total_requests += 1;
+
+                if !continue_next {
+                    break;
+                }
+            }
+        }
+
+        debug!("Worker completed: {} requests in {:?}", total_requests, start.elapsed());
+        Ok(())
+    }
+
+    /// Execute a single request
+    async fn execute_request(
+        &self,
+        item: &RequestItem,
+        global_ctx: &mut HashMap<String, String>,
+    ) -> Result<bool> {
+        let request = match &item.request {
+            Some(r) => r,
+            None => return Ok(true),
+        };
+
+        let repeat_times = if request.execute_repeat_times > 0 {
+            request.execute_repeat_times as usize
+        } else {
+            1
+        };
+
+        for _ in 0..repeat_times {
+            let mut runtime_vars = global_ctx.clone();
+            
+            // Build request
+            let request_builder = RequestBuilder::new(
+                &self.provider,
+                &self.config.runner,
+                self.worker_config.compress,
+            );
+
+            let req = match request_builder.build(item, &mut runtime_vars, self.http_client.client()) {
+                Ok(r) => r,
+                Err(e) => {
+                    error!("Failed to build request: {}", e);
+                    self.stats.num_errors.fetch_add(1, Ordering::Relaxed);
+                    continue;
+                }
+            };
+
+            // Get request size
+            let request_size = req.body().map(|b| b.as_bytes().map(|b| b.len()).unwrap_or(0)).unwrap_or(0) as i64;
+
+            // Log request if configured
+            if self.config.runner.log_requests {
+                info!(
+                    "[{}] {}, {:?}",
+                    req.method(),
+                    req.url(),
+                    req.headers()
+                );
+            }
+
+            // Execute request
+            let start = Instant::now();
+            let response = self.http_client.execute(req).await;
+            let duration = start.elapsed();
+
+            match response {
+                Ok(resp) => {
+                    let status = resp.status().as_u16() as i32;
+                    let response_size = resp.content_length().unwrap_or(0) as i64;
+
+                    // Log response if configured
+                    if self.config.runner.log_requests 
+                        || self.config.runner.log_status_codes.contains(&status) 
+                    {
+                        info!("status: {}, duration: {:?}", status, duration);
+                    }
+
+                    // Check for error status
+                    let is_error = status >= 400 || status == 0;
+                    self.stats.record(duration, request_size, response_size, status, is_error);
+
+                    // Handle assertions
+                    if let Some(ref assert_config) = item.assert {
+                        // Get response body for assertions
+                        let body = resp.text().await.unwrap_or_default();
+                        
+                        // Build context for assertions
+                        let ctx = build_assert_context(status, &body, duration);
+                        
+                        // Check assertions
+                        let checker = AssertionChecker::new(&ctx);
+                        if !checker.check(assert_config) {
+                            self.stats.record_assert_invalid();
+                            
+                            if !self.config.runner.continue_on_assert_invalid {
+                                warn!(
+                                    "{} {}, assertion failed, skipping subsequent requests",
+                                    request.method, request.url
+                                );
+                                return Ok(false);
+                            }
+                        }
+                    }
+
+                    // Handle register
+                    for register_map in &item.register {
+                        for (dest, src) in register_map {
+                            if let Some(value) = get_ctx_value(&build_assert_context(status, "", duration), src) {
+                                global_ctx.insert(dest.clone(), value);
+                            }
+                        }
+                    }
+                }
+                Err(e) => {
+                    error!("Request failed: {}", e);
+                    self.stats.record(duration, request_size, 0, 0, true);
+                    self.stats.record_assert_invalid();
+                }
+            }
+
+            // Handle sleep
+            if let Some(ref sleep_action) = item.sleep {
+                if sleep_action.sleep_in_milli_seconds > 0 {
+                    sleep(Duration::from_millis(sleep_action.sleep_in_milli_seconds as u64)).await;
+                }
+            }
+        }
+
+        Ok(true)
+    }
+}
+
+/// Build assertion context from response
+fn build_assert_context(status: i32, body: &str, duration: Duration) -> HashMap<String, serde_json::Value> {
+    let mut ctx = HashMap::new();
+    
+    // Response context
+    ctx.insert("_ctx.response.status".to_string(), serde_json::json!(status));
+    ctx.insert("_ctx.response.body".to_string(), serde_json::json!(body));
+    ctx.insert("_ctx.response.body_length".to_string(), serde_json::json!(body.len()));
+    ctx.insert("_ctx.elapsed".to_string(), serde_json::json!(duration.as_millis() as i64));
+
+    // Try to parse body as JSON
+    if let Ok(json) = serde_json::from_str::<serde_json::Value>(body) {
+        ctx.insert("_ctx.response.body_json".to_string(), json);
+    }
+
+    ctx
+}
+
+/// Get a value from the context by path
+fn get_ctx_value(ctx: &HashMap<String, serde_json::Value>, path: &str) -> Option<String> {
+    // Direct lookup first
+    if let Some(value) = ctx.get(path) {
+        return Some(value.to_string());
+    }
+
+    // Try JSON path lookup for body_json
+    if path.starts_with("_ctx.response.body_json.") {
+        if let Some(body_json) = ctx.get("_ctx.response.body_json") {
+            let json_path = path.strip_prefix("_ctx.response.body_json.")?;
+            return get_json_value(body_json, json_path);
+        }
+    }
+
+    None
+}
+
+/// Get a value from JSON by path (e.g., "foo.bar.baz")
+fn get_json_value(json: &serde_json::Value, path: &str) -> Option<String> {
+    let parts: Vec<&str> = path.split('.').collect();
+    let mut current = json;
+
+    for part in parts {
+        match current {
+            serde_json::Value::Object(map) => {
+                current = map.get(part)?;
+            }
+            serde_json::Value::Array(arr) => {
+                let idx: usize = part.parse().ok()?;
+                current = arr.get(idx)?;
+            }
+            _ => return None,
+        }
+    }
+
+    match current {
+        serde_json::Value::String(s) => Some(s.clone()),
+        serde_json::Value::Number(n) => Some(n.to_string()),
+        serde_json::Value::Bool(b) => Some(b.to_string()),
+        _ => Some(current.to_string()),
+    }
+}
diff --git a/loadgen-rust/src/main.rs b/loadgen-rust/src/main.rs
new file mode 100644
index 0000000..370e9c8
--- /dev/null
+++ b/loadgen-rust/src/main.rs
@@ -0,0 +1,281 @@
+// Copyright (C) INFINI Labs & INFINI LIMITED.
+//
+// The INFINI Loadgen is offered under the GNU Affero General Public License v3.0
+// and as commercial software.
+//
+// For commercial licensing, contact us at:
+//   - Website: infinilabs.com
+//   - Email: hello@infini.ltd
+//
+// Open Source licensed under AGPL V3:
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+//! INFINI Loadgen - Main entry point
+//!
+//! A high-performance HTTP load generator and testing suite.
+
+use anyhow::Result;
+use clap::Parser;
+use std::path::{Path, PathBuf};
+use std::process::ExitCode;
+use std::sync::atomic::{AtomicBool, Ordering};
+use std::sync::Arc;
+use tracing::{error, info};
+
+use loadgen::config::yaml::load_config;
+use loadgen::loader::generator::LoadGenerator;
+use loadgen::runner::test::TestRunner;
+
+/// CLI argument parser
+#[derive(Parser, Debug)]
+#[command(
+    name = "loadgen",
+    about = "A high-performance HTTP load generator and testing suite",
+    version,
+    author = "INFINI Labs <hello@infini.ltd>",
+    before_help = r#"
+   __   ___  _      ___  ___   __    __
+  / /  /___\/_\    /   \/ _ \ /__\/\ \ \
+ / /  //  ///_\\  / /\ / /_\//_\ /  \/ /
+/ /__/ \_//  _  \/ /_// /_\\//__/ /\  /
+\____|___/\_/ \_/___,'\____/\__/\_\ \/
+
+HOME: https://github.com/infinilabs/loadgen/
+"#
+)]
+struct Cli {
+    /// Number of concurrent threads to use
+    #[arg(short = 'c', long = "concurrency", default_value = "1")]
+    concurrency: usize,
+
+    /// Duration of the test in seconds
+    #[arg(short = 'd', long = "duration", default_value = "5")]
+    duration: u64,
+
+    /// Maximum requests per second (fixed QPS), -1 for unlimited
+    #[arg(short = 'r', long = "rate", default_value = "-1")]
+    rate_limit: i64,
+
+    /// Total number of requests to send, -1 for unlimited
+    #[arg(short = 'l', long = "limit", default_value = "-1")]
+    request_limit: i64,
+
+    /// Request timeout in seconds, 0 for no timeout
+    #[arg(long = "timeout", default_value = "0")]
+    timeout: u64,
+
+    /// Connection read timeout in seconds, 0 inherits from timeout
+    #[arg(long = "read-timeout", default_value = "0")]
+    read_timeout: u64,
+
+    /// Connection write timeout in seconds, 0 inherits from timeout
+    #[arg(long = "write-timeout", default_value = "0")]
+    write_timeout: u64,
+
+    /// Connection dial timeout in seconds
+    #[arg(long = "dial-timeout", default_value = "3")]
+    dial_timeout: u64,
+
+    /// Enable gzip compression for requests
+    #[arg(long = "compress", default_value = "false")]
+    compress: bool,
+
+    /// Enable mixed requests from YAML/DSL
+    #[arg(long = "mixed", default_value = "false")]
+    mixed: bool,
+
+    /// Number of rounds for each request configuration, -1 for unlimited
+    #[arg(long = "total-rounds", default_value = "-1")]
+    total_rounds: i64,
+
+    /// Path to a DSL-based request file to execute
+    #[arg(long = "run")]
+    dsl_file: Option<PathBuf>,
+
+    /// Path to YAML config file
+    #[arg(short = 'C', long = "config", default_value = "loadgen.yml")]
+    config: PathBuf,
+
+    /// Log level (trace, debug, info, warn, error)
+    #[arg(long = "log", default_value = "info")]
+    log_level: String,
+
+    /// Run in debug mode
+    #[arg(long = "debug", default_value = "false")]
+    debug: bool,
+}
+
+fn print_header() {
+    println!(
+        r#"
+   __   ___  _      ___  ___   __    __
+  / /  /___\/_\    /   \/ _ \ /__\/\ \ \
+ / /  //  ///_\\  / /\ / /_\//_\ /  \/ /
+/ /__/ \_//  _  \/ /_// /_\\//__/ /\  /
+\____|___/\_/ \_/___,'\____/\__/\_\ \/
+
+HOME: https://github.com/infinilabs/loadgen/
+"#
+    );
+}
+
+fn setup_logging(log_level: &str, debug: bool) {
+    let level = if debug {
+        "debug"
+    } else {
+        log_level
+    };
+
+    let filter = tracing_subscriber::EnvFilter::try_from_default_env()
+        .unwrap_or_else(|_| tracing_subscriber::EnvFilter::new(level));
+
+    tracing_subscriber::fmt()
+        .with_env_filter(filter)
+        .with_target(false)
+        .with_thread_ids(false)
+        .init();
+}
+
+#[tokio::main]
+async fn main() -> ExitCode {
+    let cli = Cli::parse();
+
+    print_header();
+    setup_logging(&cli.log_level, cli.debug);
+
+    // Setup Ctrl+C handler
+    let interrupted = Arc::new(AtomicBool::new(false));
+    let interrupted_clone = Arc::clone(&interrupted);
+    
+    ctrlc::set_handler(move || {
+        info!("Received interrupt signal, shutting down...");
+        interrupted_clone.store(true, Ordering::SeqCst);
+    })
+    .expect("Failed to set Ctrl+C handler");
+
+    // Load configuration
+    let config = match load_config(&cli.config).await {
+        Ok(config) => config,
+        Err(e) => {
+            error!("Failed to load config: {}", e);
+            return ExitCode::from(1);
+        }
+    };
+
+    // Create CLI options
+    let cli_options = loadgen::loader::generator::CliOptions {
+        concurrency: cli.concurrency,
+        duration: cli.duration,
+        rate_limit: cli.rate_limit,
+        request_limit: cli.request_limit,
+        timeout: cli.timeout,
+        read_timeout: cli.read_timeout,
+        write_timeout: cli.write_timeout,
+        dial_timeout: cli.dial_timeout,
+        compress: cli.compress,
+        total_rounds: cli.total_rounds,
+        debug: cli.debug,
+    };
+
+    let mut exit_code = 0;
+
+    // Run DSL file if specified
+    if let Some(dsl_file) = &cli.dsl_file {
+        info!("Running DSL based requests from {:?}", dsl_file);
+        match run_dsl_file(&config, dsl_file, &cli_options, Arc::clone(&interrupted)).await {
+            Ok(status) => {
+                if status != 0 {
+                    exit_code = status;
+                }
+            }
+            Err(e) => {
+                error!("Failed to run DSL file: {}", e);
+                return ExitCode::from(1);
+            }
+        }
+        if !cli.mixed {
+            return ExitCode::from(exit_code as u8);
+        }
+    }
+
+    // Run YAML-based requests
+    if !config.requests.is_empty() {
+        info!("Running YAML based requests");
+        match run_loader(&config, &cli_options, Arc::clone(&interrupted)).await {
+            Ok(status) => {
+                if status != 0 {
+                    exit_code = status;
+                }
+            }
+            Err(e) => {
+                error!("Failed to run loader: {}", e);
+                return ExitCode::from(2);
+            }
+        }
+        if !cli.mixed {
+            return ExitCode::from(exit_code as u8);
+        }
+    }
+
+    // Run test suite if configured
+    if !config.tests.is_empty() {
+        info!("Running test suite");
+        let runner = TestRunner::new(&config);
+        if !runner.run().await {
+            exit_code = 1;
+        }
+    }
+
+    ExitCode::from(exit_code as u8)
+}
+
+async fn run_dsl_file(
+    config: &loadgen::AppConfig,
+    path: &Path,
+    cli_options: &loadgen::loader::generator::CliOptions,
+    interrupted: Arc<AtomicBool>,
+) -> Result<i32> {
+    use loadgen::config::dsl::parse_dsl_file;
+
+    let loader_config = parse_dsl_file(path, config).await?;
+    run_loader_config(&loader_config, cli_options, interrupted).await
+}
+
+async fn run_loader(
+    config: &loadgen::AppConfig,
+    cli_options: &loadgen::loader::generator::CliOptions,
+    interrupted: Arc<AtomicBool>,
+) -> Result<i32> {
+    let loader_config = config.to_loader_config();
+    run_loader_config(&loader_config, cli_options, interrupted).await
+}
+
+async fn run_loader_config(
+    config: &loadgen::LoaderConfig,
+    cli_options: &loadgen::loader::generator::CliOptions,
+    interrupted: Arc<AtomicBool>,
+) -> Result<i32> {
+    let mut generator = LoadGenerator::new(config.clone(), cli_options.clone(), interrupted)?;
+    let stats = generator.run().await?;
+
+    // Check assertions
+    if config.runner.assert_invalid && stats.num_assert_invalid > 0 {
+        return Ok(1);
+    }
+    if config.runner.assert_error && stats.num_errors > 0 {
+        return Ok(2);
+    }
+
+    Ok(0)
+}
diff --git a/loadgen-rust/src/runner/mod.rs b/loadgen-rust/src/runner/mod.rs
new file mode 100644
index 0000000..2d57c7d
--- /dev/null
+++ b/loadgen-rust/src/runner/mod.rs
@@ -0,0 +1,26 @@
+// Copyright (C) INFINI Labs & INFINI LIMITED.
+//
+// The INFINI Loadgen is offered under the GNU Affero General Public License v3.0
+// and as commercial software.
+//
+// For commercial licensing, contact us at:
+//   - Website: infinilabs.com
+//   - Email: hello@infini.ltd
+//
+// Open Source licensed under AGPL V3:
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+//! Runner module for loadgen
+
+pub mod test;
diff --git a/loadgen-rust/src/runner/test.rs b/loadgen-rust/src/runner/test.rs
new file mode 100644
index 0000000..ffe4715
--- /dev/null
+++ b/loadgen-rust/src/runner/test.rs
@@ -0,0 +1,174 @@
+// Copyright (C) INFINI Labs & INFINI LIMITED.
+//
+// The INFINI Loadgen is offered under the GNU Affero General Public License v3.0
+// and as commercial software.
+//
+// For commercial licensing, contact us at:
+//   - Website: infinilabs.com
+//   - Email: hello@infini.ltd
+//
+// Open Source licensed under AGPL V3:
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+//! Test runner for executing test suites
+
+use std::path::Path;
+use std::sync::atomic::AtomicBool;
+use std::sync::Arc;
+use std::time::Instant;
+
+use chrono::Local;
+use tracing::{debug, error, info};
+
+use crate::config::dsl::parse_dsl_file;
+use crate::config::types::AppConfig;
+use crate::loader::generator::{CliOptions, LoadGenerator};
+
+/// Test result
+#[derive(Debug)]
+pub struct TestResult {
+    pub failed: bool,
+    pub duration_ms: i64,
+    pub error: Option<String>,
+}
+
+/// Test message for reporting
+#[derive(Debug)]
+pub struct TestMsg {
+    pub path: String,
+    pub status: String, // ABORTED/FAILED/SUCCESS
+    pub duration_ms: i64,
+}
+
+/// Test runner for executing test suites
+pub struct TestRunner<'a> {
+    config: &'a AppConfig,
+}
+
+impl<'a> TestRunner<'a> {
+    /// Create a new test runner
+    pub fn new(config: &'a AppConfig) -> Self {
+        Self { config }
+    }
+
+    /// Run all tests
+    pub async fn run(&self) -> bool {
+        let mut results: Vec<TestMsg> = Vec::new();
+
+        for test in &self.config.tests {
+            // Wait between tests
+            tokio::time::sleep(std::time::Duration::from_secs(1)).await;
+
+            let result = self.run_test(test).await;
+            let msg = TestMsg {
+                path: test.path.clone(),
+                status: match &result {
+                    Ok(r) if r.failed => "FAILED".to_string(),
+                    Ok(_) => "SUCCESS".to_string(),
+                    Err(_) => "ABORTED".to_string(),
+                },
+                duration_ms: result.as_ref().map(|r| r.duration_ms).unwrap_or(0),
+            };
+            results.push(msg);
+        }
+
+        // Print summary
+        let mut all_ok = true;
+        for msg in &results {
+            let timestamp = Local::now().format("%Y-%m-%d %H:%M:%S");
+            info!(
+                "[{}][TEST][{}] [{}] duration: {}ms",
+                timestamp, msg.status, msg.path, msg.duration_ms
+            );
+            if msg.status != "SUCCESS" {
+                all_ok = false;
+            }
+        }
+
+        all_ok
+    }
+
+    /// Run a single test
+    async fn run_test(&self, test: &crate::config::types::Test) -> anyhow::Result<TestResult> {
+        let start = Instant::now();
+        let mut result = TestResult {
+            failed: false,
+            duration_ms: 0,
+            error: None,
+        };
+
+        // Find DSL file
+        let dsl_path = Path::new(&test.path).join("loadgen.dsl");
+        if !dsl_path.exists() {
+            debug!("DSL file not found: {:?}", dsl_path);
+            result.error = Some(format!("DSL file not found: {:?}", dsl_path));
+            result.failed = true;
+            result.duration_ms = start.elapsed().as_millis() as i64;
+            return Ok(result);
+        }
+
+        // Parse DSL
+        let loader_config = match parse_dsl_file(&dsl_path, self.config).await {
+            Ok(c) => c,
+            Err(e) => {
+                error!("Failed to parse DSL: {}", e);
+                result.error = Some(format!("Failed to parse DSL: {}", e));
+                result.failed = true;
+                result.duration_ms = start.elapsed().as_millis() as i64;
+                return Ok(result);
+            }
+        };
+
+        // Create generator
+        let cli_options = CliOptions {
+            compress: test.compress,
+            ..Default::default()
+        };
+
+        let interrupted = Arc::new(AtomicBool::new(false));
+        let mut generator = match LoadGenerator::new(loader_config.clone(), cli_options, interrupted) {
+            Ok(g) => g,
+            Err(e) => {
+                error!("Failed to create generator: {}", e);
+                result.error = Some(format!("Failed to create generator: {}", e));
+                result.failed = true;
+                result.duration_ms = start.elapsed().as_millis() as i64;
+                return Ok(result);
+            }
+        };
+
+        // Run generator
+        let stats = match generator.run().await {
+            Ok(s) => s,
+            Err(e) => {
+                error!("Generator failed: {}", e);
+                result.error = Some(format!("Generator failed: {}", e));
+                result.failed = true;
+                result.duration_ms = start.elapsed().as_millis() as i64;
+                return Ok(result);
+            }
+        };
+
+        // Check results
+        if loader_config.runner.assert_invalid && stats.num_assert_invalid > 0 {
+            result.failed = true;
+        }
+        if loader_config.runner.assert_error && stats.num_errors > 0 {
+            result.failed = true;
+        }
+
+        result.duration_ms = start.elapsed().as_millis() as i64;
+        Ok(result)
+    }
+}
diff --git a/loadgen-rust/src/template/engine.rs b/loadgen-rust/src/template/engine.rs
new file mode 100644
index 0000000..7cd2ba0
--- /dev/null
+++ b/loadgen-rust/src/template/engine.rs
@@ -0,0 +1,206 @@
+// Copyright (C) INFINI Labs & INFINI LIMITED.
+//
+// The INFINI Loadgen is offered under the GNU Affero General Public License v3.0
+// and as commercial software.
+//
+// For commercial licensing, contact us at:
+//   - Website: infinilabs.com
+//   - Email: hello@infini.ltd
+//
+// Open Source licensed under AGPL V3:
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+//! Template engine for variable substitution
+//!
+//! Supports the $[[variable_name]] syntax used by loadgen
+
+use std::collections::HashMap;
+
+/// Template engine for processing variable substitutions
+pub struct TemplateEngine;
+
+/// Start delimiter for variables
+const START_DELIM: &str = "$[[";
+/// End delimiter for variables
+const END_DELIM: &str = "]]";
+
+impl TemplateEngine {
+    /// Check if a string contains template variables
+    pub fn has_template(input: &str) -> bool {
+        input.contains(START_DELIM)
+    }
+
+    /// Execute template substitution with a callback function for variable resolution
+    pub fn execute<F>(input: &str, resolver: F) -> String
+    where
+        F: Fn(&str) -> String,
+    {
+        if !Self::has_template(input) {
+            return input.to_string();
+        }
+
+        let mut result = String::with_capacity(input.len());
+        let mut remaining = input;
+
+        while let Some(start_idx) = remaining.find(START_DELIM) {
+            // Append text before the variable
+            result.push_str(&remaining[..start_idx]);
+
+            // Find the end of the variable
+            let after_start = &remaining[start_idx + START_DELIM.len()..];
+            if let Some(end_idx) = after_start.find(END_DELIM) {
+                let var_name = &after_start[..end_idx];
+                let value = resolver(var_name);
+                result.push_str(&value);
+                remaining = &after_start[end_idx + END_DELIM.len()..];
+            } else {
+                // No closing delimiter found, append the rest and break
+                result.push_str(&remaining[start_idx..]);
+                remaining = "";
+                break;
+            }
+        }
+
+        // Append remaining text
+        result.push_str(remaining);
+        result
+    }
+
+    /// Execute template substitution with a HashMap of variables
+    pub fn execute_with_map(input: &str, variables: &HashMap<String, String>) -> String {
+        Self::execute(input, |name| {
+            variables
+                .get(name)
+                .cloned()
+                .unwrap_or_else(|| format!("$[[{}]]", name))
+        })
+    }
+
+    /// Extract all variable names from a template string
+    pub fn extract_variables(input: &str) -> Vec<String> {
+        let mut variables = Vec::new();
+        let mut remaining = input;
+
+        while let Some(start_idx) = remaining.find(START_DELIM) {
+            let after_start = &remaining[start_idx + START_DELIM.len()..];
+            if let Some(end_idx) = after_start.find(END_DELIM) {
+                let var_name = &after_start[..end_idx];
+                variables.push(var_name.to_string());
+                remaining = &after_start[end_idx + END_DELIM.len()..];
+            } else {
+                break;
+            }
+        }
+
+        variables
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_has_template() {
+        assert!(TemplateEngine::has_template("Hello $[[name]]!"));
+        assert!(TemplateEngine::has_template("$[[a]] $[[b]]"));
+        assert!(!TemplateEngine::has_template("Hello world!"));
+        assert!(!TemplateEngine::has_template("$[name]"));
+    }
+
+    #[test]
+    fn test_execute_simple() {
+        let result = TemplateEngine::execute("Hello $[[name]]!", |var| {
+            if var == "name" {
+                "World".to_string()
+            } else {
+                format!("unknown:{}", var)
+            }
+        });
+        assert_eq!(result, "Hello World!");
+    }
+
+    #[test]
+    fn test_execute_multiple() {
+        let result = TemplateEngine::execute("$[[a]] and $[[b]]", |var| {
+            match var {
+                "a" => "first".to_string(),
+                "b" => "second".to_string(),
+                _ => "unknown".to_string(),
+            }
+        });
+        assert_eq!(result, "first and second");
+    }
+
+    #[test]
+    fn test_execute_no_template() {
+        let result = TemplateEngine::execute("No template here", |_| "unused".to_string());
+        assert_eq!(result, "No template here");
+    }
+
+    #[test]
+    fn test_execute_with_map() {
+        let mut vars = HashMap::new();
+        vars.insert("name".to_string(), "Alice".to_string());
+        vars.insert("greeting".to_string(), "Hello".to_string());
+
+        let result = TemplateEngine::execute_with_map("$[[greeting]] $[[name]]!", &vars);
+        assert_eq!(result, "Hello Alice!");
+    }
+
+    #[test]
+    fn test_execute_missing_variable() {
+        let vars = HashMap::new();
+        let result = TemplateEngine::execute_with_map("Hello $[[name]]!", &vars);
+        assert_eq!(result, "Hello $[[name]]!");
+    }
+
+    #[test]
+    fn test_extract_variables() {
+        let vars = TemplateEngine::extract_variables("$[[a]] and $[[b.c]] = $[[d]]");
+        assert_eq!(vars, vec!["a", "b.c", "d"]);
+    }
+
+    #[test]
+    fn test_execute_nested_json() {
+        let result = TemplateEngine::execute(
+            r#"{"id": "$[[id]]", "name": "$[[name]]"}"#,
+            |var| match var {
+                "id" => "123".to_string(),
+                "name" => "test".to_string(),
+                _ => "".to_string(),
+            },
+        );
+        assert_eq!(result, r#"{"id": "123", "name": "test"}"#);
+    }
+
+    #[test]
+    fn test_execute_env_variable() {
+        let result = TemplateEngine::execute(
+            "http://$[[env.ES_HOST]]:$[[env.ES_PORT]]/index",
+            |var| match var {
+                "env.ES_HOST" => "localhost".to_string(),
+                "env.ES_PORT" => "9200".to_string(),
+                _ => "".to_string(),
+            },
+        );
+        assert_eq!(result, "http://localhost:9200/index");
+    }
+
+    #[test]
+    fn test_execute_unclosed_delimiter() {
+        let result = TemplateEngine::execute("Hello $[[name", |_| "World".to_string());
+        assert_eq!(result, "Hello $[[name");
+    }
+}
diff --git a/loadgen-rust/src/template/mod.rs b/loadgen-rust/src/template/mod.rs
new file mode 100644
index 0000000..1780b55
--- /dev/null
+++ b/loadgen-rust/src/template/mod.rs
@@ -0,0 +1,28 @@
+// Copyright (C) INFINI Labs & INFINI LIMITED.
+//
+// The INFINI Loadgen is offered under the GNU Affero General Public License v3.0
+// and as commercial software.
+//
+// For commercial licensing, contact us at:
+//   - Website: infinilabs.com
+//   - Email: hello@infini.ltd
+//
+// Open Source licensed under AGPL V3:
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+//! Template module for loadgen
+
+pub mod engine;
+
+pub use engine::TemplateEngine;
diff --git a/loadgen-rust/src/variable/mod.rs b/loadgen-rust/src/variable/mod.rs
new file mode 100644
index 0000000..406fd80
--- /dev/null
+++ b/loadgen-rust/src/variable/mod.rs
@@ -0,0 +1,27 @@
+// Copyright (C) INFINI Labs & INFINI LIMITED.
+//
+// The INFINI Loadgen is offered under the GNU Affero General Public License v3.0
+// and as commercial software.
+//
+// For commercial licensing, contact us at:
+//   - Website: infinilabs.com
+//   - Email: hello@infini.ltd
+//
+// Open Source licensed under AGPL V3:
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+//! Variable module for loadgen
+
+pub mod provider;
+pub mod types;
diff --git a/loadgen-rust/src/variable/provider.rs b/loadgen-rust/src/variable/provider.rs
new file mode 100644
index 0000000..62b4c1b
--- /dev/null
+++ b/loadgen-rust/src/variable/provider.rs
@@ -0,0 +1,420 @@
+// Copyright (C) INFINI Labs & INFINI LIMITED.
+//
+// The INFINI Loadgen is offered under the GNU Affero General Public License v3.0
+// and as commercial software.
+//
+// For commercial licensing, contact us at:
+//   - Website: infinilabs.com
+//   - Email: hello@infini.ltd
+//
+// Open Source licensed under AGPL V3:
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+//! Variable provider - generates values for variables
+
+use std::collections::HashMap;
+use std::fs::File;
+use std::io::{BufRead, BufReader};
+use std::sync::Arc;
+
+use base64::{engine::general_purpose::STANDARD as BASE64, Engine};
+use chrono::{Local, Utc};
+use rand::Rng;
+use roaring::RoaringBitmap;
+use uuid::Uuid;
+
+use super::types::{SequenceCounter32, SequenceCounter64, VariableType};
+use crate::config::types::Variable;
+
+/// Timestamp format for now_utc_lite
+const TS_LAYOUT: &str = "%Y-%m-%dT%H:%M:%S%.3f";
+
+/// Variable provider for generating variable values
+pub struct VariableProvider {
+    /// Variable definitions
+    variables: HashMap<String, Variable>,
+    /// Data loaded from files or inline definitions
+    dict: HashMap<String, Vec<String>>,
+    /// 32-bit sequence counters
+    seq32: HashMap<String, Arc<SequenceCounter32>>,
+    /// 64-bit sequence counters
+    seq64: HashMap<String, Arc<SequenceCounter64>>,
+    /// Character replacers
+    replacers: HashMap<String, Vec<(String, String)>>,
+    /// Environment variables
+    env_vars: HashMap<String, String>,
+}
+
+impl VariableProvider {
+    /// Create a new variable provider
+    pub fn new(variables: &[Variable], env_vars: HashMap<String, String>) -> Self {
+        let mut provider = VariableProvider {
+            variables: HashMap::new(),
+            dict: HashMap::new(),
+            seq32: HashMap::new(),
+            seq64: HashMap::new(),
+            replacers: HashMap::new(),
+            env_vars,
+        };
+
+        for var in variables {
+            provider.register_variable(var.clone());
+        }
+
+        provider
+    }
+
+    /// Register a variable
+    pub fn register_variable(&mut self, var: Variable) {
+        let name = var.name.trim().to_string();
+
+        // Load data from file if specified
+        let mut lines: Vec<String> = Vec::new();
+
+        if !var.path.is_empty() {
+            if let Ok(file) = File::open(&var.path) {
+                let reader = BufReader::new(file);
+                for line in reader.lines().map_while(Result::ok) {
+                    let trimmed = line.trim().to_string();
+                    if !trimmed.is_empty() {
+                        lines.push(trimmed);
+                    }
+                }
+            }
+        }
+
+        // Add inline data
+        for item in &var.data {
+            let trimmed = item.trim().to_string();
+            if !trimmed.is_empty() {
+                lines.push(trimmed);
+            }
+        }
+
+        // Store replacer if specified
+        if !var.replace.is_empty() {
+            let replacements: Vec<(String, String)> = var
+                .replace
+                .iter()
+                .map(|(k, v)| (k.clone(), v.clone()))
+                .collect();
+            self.replacers.insert(name.clone(), replacements);
+        }
+
+        // Create sequence counters
+        let var_type = VariableType::from(var.var_type.as_str());
+        match var_type {
+            VariableType::Sequence => {
+                let counter = Arc::new(SequenceCounter32::new(var.from as u32, var.to as u32));
+                self.seq32.insert(name.clone(), counter);
+            }
+            VariableType::Sequence64 => {
+                let counter = Arc::new(SequenceCounter64::new(var.from, var.to));
+                self.seq64.insert(name.clone(), counter);
+            }
+            _ => {}
+        }
+
+        self.dict.insert(name.clone(), lines);
+        self.variables.insert(name, var);
+    }
+
+    /// Get a variable value
+    pub fn get_value(&self, key: &str, runtime_vars: Option<&HashMap<String, String>>) -> String {
+        // Check runtime variables first
+        if let Some(vars) = runtime_vars {
+            if let Some(value) = vars.get(key) {
+                return value.clone();
+            }
+        }
+
+        // Check for environment variable reference
+        if let Some(env_key) = key.strip_prefix("env.") {
+            return self.env_vars.get(env_key).cloned().unwrap_or_default();
+        }
+
+        // Get variable definition
+        let var = match self.variables.get(key) {
+            Some(v) => v,
+            None => return "not_found".to_string(),
+        };
+
+        let raw_value = self.build_variable_value(var);
+
+        // Apply replacer if exists
+        if let Some(replacements) = self.replacers.get(key) {
+            let mut result = raw_value;
+            for (from, to) in replacements {
+                result = result.replace(from, to);
+            }
+            return result;
+        }
+
+        raw_value
+    }
+
+    /// Build a variable value based on its type
+    fn build_variable_value(&self, var: &Variable) -> String {
+        let var_type = VariableType::from(var.var_type.as_str());
+
+        match var_type {
+            VariableType::Sequence => {
+                if let Some(counter) = self.seq32.get(&var.name) {
+                    return counter.next().to_string();
+                }
+                "0".to_string()
+            }
+            VariableType::Sequence64 => {
+                if let Some(counter) = self.seq64.get(&var.name) {
+                    return counter.next().to_string();
+                }
+                "0".to_string()
+            }
+            VariableType::Uuid => Uuid::new_v4().to_string(),
+            VariableType::NowLocal => Local::now().to_string(),
+            VariableType::NowUtc => Utc::now().to_string(),
+            VariableType::NowUtcLite => Utc::now().format(TS_LAYOUT).to_string(),
+            VariableType::NowUnix => Local::now().timestamp().to_string(),
+            VariableType::NowUnixInMs => Local::now().timestamp_millis().to_string(),
+            VariableType::NowUnixInMicro => Local::now().timestamp_micros().to_string(),
+            VariableType::NowUnixInNano => {
+                Local::now().timestamp_nanos_opt().unwrap_or(0).to_string()
+            }
+            VariableType::NowWithFormat => {
+                if var.format.is_empty() {
+                    panic!("Date format is not set for variable: {}", var.name);
+                }
+                // Convert Go date format to chrono format
+                let format = convert_go_time_format(&var.format);
+                Local::now().format(&format).to_string()
+            }
+            VariableType::Range => {
+                let mut rng = rand::thread_rng();
+                let range = var.to - var.from + 1;
+                let value = rng.gen_range(0..range) + var.from;
+                value.to_string()
+            }
+            VariableType::RandomArray => self.build_random_array(var),
+            VariableType::IntArrayBitmap => self.build_int_array_bitmap(var),
+            VariableType::File | VariableType::List => {
+                if let Some(data) = self.dict.get(&var.name) {
+                    if data.is_empty() {
+                        return String::new();
+                    }
+                    if data.len() == 1 {
+                        return data[0].clone();
+                    }
+                    let mut rng = rand::thread_rng();
+                    let idx = rng.gen_range(0..data.len());
+                    return data[idx].clone();
+                }
+                String::new()
+            }
+            VariableType::Env => {
+                self.env_vars.get(&var.name).cloned().unwrap_or_default()
+            }
+        }
+    }
+
+    /// Build a random array value
+    fn build_random_array(&self, var: &Variable) -> String {
+        let mut result = String::new();
+
+        if var.square_bracket {
+            result.push('[');
+        }
+
+        if !var.variable_key.is_empty() && var.size > 0 {
+            for i in 0..var.size {
+                if i > 0 {
+                    result.push(',');
+                }
+
+                // Get value from referenced variable
+                let value = self.get_value(&var.variable_key, None);
+
+                // Add string brackets if needed
+                if var.variable_type == "string" {
+                    let bracket = if var.string_bracket.is_empty() {
+                        "\""
+                    } else {
+                        &var.string_bracket
+                    };
+                    result.push_str(bracket);
+                    result.push_str(&value);
+                    result.push_str(bracket);
+                } else {
+                    result.push_str(&value);
+                }
+            }
+        }
+
+        if var.square_bracket {
+            result.push(']');
+        }
+
+        result
+    }
+
+    /// Build a roaring bitmap encoded integer array
+    fn build_int_array_bitmap(&self, var: &Variable) -> String {
+        let mut bitmap = RoaringBitmap::new();
+        let mut rng = rand::thread_rng();
+
+        if var.size > 0 {
+            for _ in 0..var.size {
+                let range = var.to - var.from + 1;
+                let value = rng.gen_range(0..range) + var.from;
+                bitmap.insert(value as u32);
+            }
+        }
+
+        let mut bytes = Vec::new();
+        bitmap.serialize_into(&mut bytes).unwrap_or_default();
+        BASE64.encode(&bytes)
+    }
+
+    /// Clear all data (for reset_context)
+    pub fn clear(&mut self) {
+        self.dict.clear();
+        self.seq32.clear();
+        self.seq64.clear();
+        self.variables.clear();
+        self.replacers.clear();
+    }
+}
+
+/// Convert Go time format to chrono strftime format
+fn convert_go_time_format(go_format: &str) -> String {
+    // Go uses a reference time: Mon Jan 2 15:04:05 MST 2006
+    // This maps Go format specifiers to chrono format specifiers
+    // Order matters - replace longer patterns first to avoid partial matches
+    go_format
+        // Year - must be first to avoid issues with other numbers
+        .replace("2006", "%Y")
+        .replace("06", "%y")
+        // Month patterns - order by length (longer first)
+        .replace("January", "%B")
+        .replace("Jan", "%b")
+        .replace("01", "%m")
+        // Day patterns
+        .replace("Monday", "%A")
+        .replace("Mon", "%a")
+        .replace("02", "%d")
+        // Hour patterns - must be before minute patterns
+        .replace("15", "%H")  // 24-hour
+        .replace("03", "%I")  // 12-hour with leading zero
+        // Minute patterns - must be after hour patterns
+        .replace("04", "%M")
+        // Second patterns
+        .replace("05", "%S")
+        // Timezone patterns
+        .replace("-0700", "%z")
+        .replace("-07:00", "%:z")
+        .replace("-07", "%z")
+        .replace("MST", "%Z")
+        // AM/PM
+        .replace("PM", "%p")
+        .replace("pm", "%P")
+        // Subseconds
+        .replace(".000000000", "%.9f")
+        .replace(".000000", "%.6f")
+        .replace(".000", "%.3f")
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_sequence_variable() {
+        let vars = vec![Variable {
+            name: "id".to_string(),
+            var_type: "sequence".to_string(),
+            from: 1,
+            to: 100,
+            ..Default::default()
+        }];
+
+        let provider = VariableProvider::new(&vars, HashMap::new());
+        
+        assert_eq!(provider.get_value("id", None), "1");
+        assert_eq!(provider.get_value("id", None), "2");
+        assert_eq!(provider.get_value("id", None), "3");
+    }
+
+    #[test]
+    fn test_uuid_variable() {
+        let vars = vec![Variable {
+            name: "uuid".to_string(),
+            var_type: "uuid".to_string(),
+            ..Default::default()
+        }];
+
+        let provider = VariableProvider::new(&vars, HashMap::new());
+        
+        let value = provider.get_value("uuid", None);
+        assert!(Uuid::parse_str(&value).is_ok());
+    }
+
+    #[test]
+    fn test_range_variable() {
+        let vars = vec![Variable {
+            name: "num".to_string(),
+            var_type: "range".to_string(),
+            from: 10,
+            to: 20,
+            ..Default::default()
+        }];
+
+        let provider = VariableProvider::new(&vars, HashMap::new());
+        
+        for _ in 0..100 {
+            let value: u64 = provider.get_value("num", None).parse().unwrap();
+            assert!(value >= 10 && value <= 20);
+        }
+    }
+
+    #[test]
+    fn test_list_variable() {
+        let vars = vec![Variable {
+            name: "user".to_string(),
+            var_type: "list".to_string(),
+            data: vec!["alice".to_string(), "bob".to_string(), "charlie".to_string()],
+            ..Default::default()
+        }];
+
+        let provider = VariableProvider::new(&vars, HashMap::new());
+        
+        let value = provider.get_value("user", None);
+        assert!(["alice", "bob", "charlie"].contains(&value.as_str()));
+    }
+
+    #[test]
+    fn test_env_variable() {
+        let mut env_vars = HashMap::new();
+        env_vars.insert("TEST_VAR".to_string(), "test_value".to_string());
+
+        let provider = VariableProvider::new(&[], env_vars);
+        
+        assert_eq!(provider.get_value("env.TEST_VAR", None), "test_value");
+    }
+
+    #[test]
+    fn test_convert_go_time_format() {
+        assert_eq!(convert_go_time_format("2006-01-02"), "%Y-%m-%d");
+        assert_eq!(convert_go_time_format("15:04:05"), "%H:%M:%S");
+        assert_eq!(convert_go_time_format("2006-01-02T15:04:05-0700"), "%Y-%m-%dT%H:%M:%S%z");
+    }
+}
diff --git a/loadgen-rust/src/variable/types.rs b/loadgen-rust/src/variable/types.rs
new file mode 100644
index 0000000..a784d05
--- /dev/null
+++ b/loadgen-rust/src/variable/types.rs
@@ -0,0 +1,144 @@
+// Copyright (C) INFINI Labs & INFINI LIMITED.
+//
+// The INFINI Loadgen is offered under the GNU Affero General Public License v3.0
+// and as commercial software.
+//
+// For commercial licensing, contact us at:
+//   - Website: infinilabs.com
+//   - Email: hello@infini.ltd
+//
+// Open Source licensed under AGPL V3:
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+//! Variable type definitions
+
+use std::sync::atomic::{AtomicU32, AtomicU64};
+
+/// Variable types supported by loadgen
+#[derive(Debug, Clone, PartialEq)]
+pub enum VariableType {
+    /// Load values from a file
+    File,
+    /// Inline list of values
+    List,
+    /// 32-bit auto-incrementing sequence
+    Sequence,
+    /// 64-bit auto-incrementing sequence
+    Sequence64,
+    /// Random number in range
+    Range,
+    /// UUID v4
+    Uuid,
+    /// Current local time
+    NowLocal,
+    /// Current UTC time
+    NowUtc,
+    /// Current UTC time in compact format
+    NowUtcLite,
+    /// Unix timestamp in seconds
+    NowUnix,
+    /// Unix timestamp in milliseconds
+    NowUnixInMs,
+    /// Unix timestamp in microseconds
+    NowUnixInMicro,
+    /// Unix timestamp in nanoseconds
+    NowUnixInNano,
+    /// Custom formatted time
+    NowWithFormat,
+    /// Random array from another variable
+    RandomArray,
+    /// Roaring bitmap encoded integer array
+    IntArrayBitmap,
+    /// Environment variable
+    Env,
+}
+
+impl From<&str> for VariableType {
+    fn from(s: &str) -> Self {
+        match s.to_lowercase().as_str() {
+            "file" => VariableType::File,
+            "list" => VariableType::List,
+            "sequence" => VariableType::Sequence,
+            "sequence64" => VariableType::Sequence64,
+            "range" => VariableType::Range,
+            "uuid" => VariableType::Uuid,
+            "now_local" => VariableType::NowLocal,
+            "now_utc" => VariableType::NowUtc,
+            "now_utc_lite" => VariableType::NowUtcLite,
+            "now_unix" => VariableType::NowUnix,
+            "now_unix_in_ms" => VariableType::NowUnixInMs,
+            "now_unix_in_micro" => VariableType::NowUnixInMicro,
+            "now_unix_in_nano" => VariableType::NowUnixInNano,
+            "now_with_format" => VariableType::NowWithFormat,
+            "random_array" => VariableType::RandomArray,
+            "int_array_bitmap" => VariableType::IntArrayBitmap,
+            "env" => VariableType::Env,
+            _ => VariableType::List, // Default to list
+        }
+    }
+}
+
+/// A sequence counter for auto-incrementing variables
+#[derive(Debug)]
+pub struct SequenceCounter32 {
+    current: AtomicU32,
+    from: u32,
+    to: u32,
+}
+
+impl SequenceCounter32 {
+    pub fn new(from: u32, to: u32) -> Self {
+        Self {
+            current: AtomicU32::new(from),
+            from,
+            to,
+        }
+    }
+
+    pub fn next(&self) -> u32 {
+        let current = self.current.fetch_add(1, std::sync::atomic::Ordering::SeqCst);
+        if self.to > 0 && current >= self.to {
+            self.current.store(self.from, std::sync::atomic::Ordering::SeqCst);
+            return self.from;
+        }
+        current
+    }
+}
+
+/// A sequence counter for 64-bit auto-incrementing variables
+#[derive(Debug)]
+pub struct SequenceCounter64 {
+    current: AtomicU64,
+    from: u64,
+    to: u64,
+}
+
+impl SequenceCounter64 {
+    pub fn new(from: u64, to: u64) -> Self {
+        Self {
+            current: AtomicU64::new(from),
+            from,
+            to,
+        }
+    }
+
+    pub fn next(&self) -> u64 {
+        let current = self.current.fetch_add(1, std::sync::atomic::Ordering::SeqCst);
+        if self.to > 0 && current >= self.to {
+            self.current.store(self.from, std::sync::atomic::Ordering::SeqCst);
+            return self.from;
+        }
+        current
+    }
+}