[receiver/tcpcheck] Add New Receiver#34458

[receiver/tcpcheck] Change CODEOWNERS#34458

[receiver/tcpcheck] Change CODEOWNERS#34458

[receiver/tcpcheck] Make Fmt#34458

[receiver/tcpcheck] Fix Version And Test#34458

[receiver/tcpcheck] Make Fmt#34458

[receiver/tcpcheck] Temporarily Change Owner#34458

[receiver/tcpcheck] Change Version#34458

[receiver/tcpcheck] Make Fmt#34458

[receiver/tcpcheck] Rebase#34458

[receiver/tcpcheck] Fix Test#34458

[receiver/tcpcheck] Make Tidy#34458

.chloggen/tcp-checker.yaml

@@ -0,0 +1,27 @@
+#Use this changelog template to create an entry for release notes.
+
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: new_component
+
+# The name of the component, or a single word describing the area of concern, (e.g. filelogreceiver)
+component: tcpcheckreceiver
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Introducing new component tcpcheck receiver
+
+# Mandatory: One or more tracking issues related to the change. You can use the PR number here if no issue exists.
+issues: [34414]
+
+# (Optional) One or more lines of additional information to render under the primary note.
+# These lines will be padded with 2 spaces and then inserted directly into the document.
+# Use pipe (|) for multiline entries.
+subtext:
+
+# If your change doesn't affect end users or the exported elements of any package,
+# you should instead start your pull request title with [chore] or use the "Skip Changelog" label.
+# Optional: The change log or logs in which this entry should be included.
+# e.g. '[user]' or '[user, api]'
+# Include 'user' if the change is relevant to end users.
+# Include 'api' if there is a change to a library API.
+# Default: '[user]'
+change_logs: []

.github/CODEOWNERS

@@ -292,6 +292,7 @@ receiver/sshcheckreceiver/                                       @open-telemetry
 receiver/statsdreceiver/                                         @open-telemetry/collector-contrib-approvers @jmacd @dmitryax
 receiver/syslogreceiver/                                         @open-telemetry/collector-contrib-approvers @djaglowski @andrzej-stencel
 receiver/systemdreceiver/                                        @open-telemetry/collector-contrib-approvers @Hemansh31 @atoulme
+receiver/tcpcheckreceiver/                                       @open-telemetry/collector-contrib-approvers @atoulme @michael-burt @chengchuanpeng
 receiver/tcplogreceiver/                                         @open-telemetry/collector-contrib-approvers @djaglowski
 receiver/tlscheckreceiver/                                       @open-telemetry/collector-contrib-approvers @atoulme @michael-burt
 receiver/udplogreceiver/                                         @open-telemetry/collector-contrib-approvers @djaglowski

.github/ISSUE_TEMPLATE/bug_report.yaml

@@ -302,6 +302,7 @@ body:
       - receiver/statsd
       - receiver/syslog
       - receiver/systemd
+      - receiver/tcpcheck
       - receiver/tcplog
       - receiver/tlscheck
       - receiver/udplog

.github/ISSUE_TEMPLATE/feature_request.yaml

@@ -296,6 +296,7 @@ body:
       - receiver/statsd
       - receiver/syslog
       - receiver/systemd
+      - receiver/tcpcheck
       - receiver/tcplog
       - receiver/tlscheck
       - receiver/udplog

.github/ISSUE_TEMPLATE/other.yaml

@@ -296,6 +296,7 @@ body:
       - receiver/statsd
       - receiver/syslog
       - receiver/systemd
+      - receiver/tcpcheck
       - receiver/tcplog
       - receiver/tlscheck
       - receiver/udplog

.github/ISSUE_TEMPLATE/unmaintained.yaml

@@ -301,6 +301,7 @@ body:
       - receiver/statsd
       - receiver/syslog
       - receiver/systemd
+      - receiver/tcpcheck
       - receiver/tcplog
       - receiver/tlscheck
       - receiver/udplog

internal/tidylist/tidylist.txt

@@ -293,6 +293,7 @@ receiver/sqlserverreceiver
 receiver/sshcheckreceiver
 receiver/statsdreceiver
 receiver/systemdreceiver
+receiver/tcpcheckreceiver
 receiver/tcplogreceiver
 receiver/tlscheckreceiver
 receiver/udplogreceiver

receiver/tcpcheckreceiver/Makefile

@@ -0,0 +1 @@
+include ../../Makefile.Common

receiver/tcpcheckreceiver/README.md

@@ -0,0 +1,48 @@
+# TCP Check Receiver
+
+<!-- status autogenerated section -->
+| Status        |           |
+| ------------- |-----------|
+| Stability     | [development]: metrics   |
+| Distributions | [contrib] |
+| Issues        | [![Open issues](https://img.shields.io/github/issues-search/open-telemetry/opentelemetry-collector-contrib?query=is%3Aissue%20is%3Aopen%20label%3Areceiver%2Ftcpcheck%20&label=open&color=orange&logo=opentelemetry)](https://github.com/open-telemetry/opentelemetry-collector-contrib/issues?q=is%3Aopen+is%3Aissue+label%3Areceiver%2Ftcpcheck) [![Closed issues](https://img.shields.io/github/issues-search/open-telemetry/opentelemetry-collector-contrib?query=is%3Aissue%20is%3Aclosed%20label%3Areceiver%2Ftcpcheck%20&label=closed&color=blue&logo=opentelemetry)](https://github.com/open-telemetry/opentelemetry-collector-contrib/issues?q=is%3Aclosed+is%3Aissue+label%3Areceiver%2Ftcpcheck) |
+| [Code Owners](https://github.com/open-telemetry/opentelemetry-collector-contrib/blob/main/CONTRIBUTING.md#becoming-a-code-owner)    | [@atoulme](https://www.github.com/atoulme), [@michael-burt](https://www.github.com/michael-burt), [@chengchuanpeng](https://www.github.com/chengchuanpeng) |
+
+[development]: https://github.com/open-telemetry/opentelemetry-collector/blob/main/docs/component-stability.md#development
+[contrib]: https://github.com/open-telemetry/opentelemetry-collector-releases/tree/main/distributions/otelcol-contrib
+<!-- end autogenerated section -->
+
+This receiver creates stats by connecting to an TCP server.
+
+
+## Configuration
+
+The following settings are required:
+- `endpoint`
+
+The following settings are optional:
+
+- `collection_interval` (default = `60s`): This receiver collects metrics on an interval. Valid time units are `ns`, `us` (or `µs`), `ms`, `s`, `m`, `h`.
+
+## Example Configuration
+
+Targets are
+
+```yaml
+receivers:
+  tcpcheck:
+    targets:
+      - endpoint: example.com:443
+        dialer:
+          timeout: 15s
+      - endpoint: foobar.com:8080
+        dialer:
+          timeout: 15s
+      - endpoint: localhost:10901
+```
+The full list of settings exposed for this receiver are documented [here](./config.go) with detailed sample configurations [here](./testdata/config.yaml).
+
+## Metrics
+
+Details about the metrics produced by this receiver can be found in [metadata.yaml](./metadata.yaml)
+

receiver/tcpcheckreceiver/config.go

@@ -0,0 +1,81 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+package tcpcheckreceiver // import "github.com/open-telemetry/opentelemetry-collector-contrib/receiver/tcpcheckreceiver"
+
+import (
+	"errors"
+	"fmt"
+	"net"
+	"strconv"
+	"strings"
+
+	"go.opentelemetry.io/collector/config/confignet"
+	"go.opentelemetry.io/collector/scraper/scraperhelper"
+	"go.uber.org/multierr"
+
+	"github.com/open-telemetry/opentelemetry-collector-contrib/receiver/tcpcheckreceiver/internal/metadata"
+)
+
+// Predefined error responses for configuration validation failures
+var (
+	errInvalidEndpoint = errors.New(`"Endpoint" must be in the form of <hostname>:<port>`)
+	errMissingTargets  = errors.New(`No targets specified`)
+	errConfigTCPCheck  = errors.New(`Invalid Config`)
+)
+
+// Config defines the configuration for the various elements of the receiver agent.
+type Config struct {
+	scraperhelper.ControllerConfig `mapstructure:",squash"`
+	metadata.MetricsBuilderConfig  `mapstructure:",squash"`
+	Targets                        []*confignet.TCPAddrConfig `mapstructure:",targets"`
+}
+
+func validatePort(port string) error {
+	portNum, err := strconv.Atoi(port)
+	if err != nil {
+		return fmt.Errorf("provided port is not a number: %s", port)
+	}
+	if portNum < 1 || portNum > 65535 {
+		return fmt.Errorf("provided port is out of valid range (1-65535): %d", portNum)
+	}
+	return nil
+}
+
+func validateTarget(cfg *confignet.TCPAddrConfig) error {
+	var err error
+
+	if cfg.Endpoint == "" {
+		return errMissingTargets
+	}
+
+	if strings.Contains(cfg.Endpoint, "://") {
+		return fmt.Errorf("endpoint contains a scheme, which is not allowed: %s", cfg.Endpoint)
+	}
+
+	_, port, parseErr := net.SplitHostPort(cfg.Endpoint)
+	if parseErr != nil {
+		return fmt.Errorf("%s: %w", errInvalidEndpoint.Error(), parseErr)
+	}
+
+	portParseErr := validatePort(port)
+	if portParseErr != nil {
+		return fmt.Errorf("%s: %w", errInvalidEndpoint.Error(), portParseErr)
+	}
+
+	return err
+}
+
+func (cfg *Config) Validate() error {
+	var err error
+
+	if len(cfg.Targets) == 0 {
+		err = multierr.Append(err, errMissingTargets)
+	}
+
+	for _, tcpConfig := range cfg.Targets {
+		err = multierr.Append(err, validateTarget(tcpConfig))
+	}
+
+	return err
+}

receiver/tcpcheckreceiver/config_test.go

@@ -0,0 +1,123 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+package tcpcheckreceiver // import "github.com/open-telemetry/opentelemetry-collector-contrib/receiver/tcpcheckreceiver"
+
+import (
+	"fmt"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/require"
+	"go.opentelemetry.io/collector/config/confignet"
+	"go.opentelemetry.io/collector/scraper/scraperhelper"
+)
+
+func TestValidate(t *testing.T) {
+	testCases := []struct {
+		desc        string
+		cfg         *Config
+		expectedErr error
+	}{
+		{
+			desc: "missing targets",
+			cfg: &Config{
+				Targets:          []*confignet.TCPAddrConfig{},
+				ControllerConfig: scraperhelper.NewDefaultControllerConfig(),
+			},
+			expectedErr: errMissingTargets,
+		},
+		{
+			desc: "invalid endpoint",
+			cfg: &Config{
+				Targets: []*confignet.TCPAddrConfig{
+					{
+						Endpoint: "endpoint:  12efg",
+						DialerConfig: confignet.DialerConfig{
+							Timeout: 12 * time.Second,
+						},
+					},
+				},
+				ControllerConfig: scraperhelper.NewDefaultControllerConfig(),
+			},
+			expectedErr: fmt.Errorf("%w: %s", errInvalidEndpoint, "provided port is not a number:   12efg"),
+		},
+		{
+			desc: "invalid config with multiple targets",
+			cfg: &Config{
+				Targets: []*confignet.TCPAddrConfig{
+					{
+						Endpoint: "endpoint:  12efg",
+					},
+					{
+						Endpoint: "https://example.com:80",
+					},
+				},
+				ControllerConfig: scraperhelper.NewDefaultControllerConfig(),
+			},
+			expectedErr: fmt.Errorf("%w: %s", errInvalidEndpoint, `provided port is not a number:   12efg; endpoint contains a scheme, which is not allowed: https://example.com:80`),
+		},
+		{
+			desc: "port out of range",
+			cfg: &Config{
+				Targets: []*confignet.TCPAddrConfig{
+					{
+						Endpoint: "www.opentelemetry.io:67000",
+					},
+				},
+				ControllerConfig: scraperhelper.NewDefaultControllerConfig(),
+			},
+			expectedErr: fmt.Errorf("%w: %s", errInvalidEndpoint, `provided port is out of valid range (1-65535): 67000`),
+		},
+		{
+			desc: "missing port",
+			cfg: &Config{
+				Targets: []*confignet.TCPAddrConfig{
+					{
+						Endpoint: "www.opentelemetry.io/docs",
+					},
+				},
+				ControllerConfig: scraperhelper.NewDefaultControllerConfig(),
+			},
+			expectedErr: fmt.Errorf("%w: %s", errInvalidEndpoint, `address www.opentelemetry.io/docs: missing port in address`),
+		},
+		{
+			desc: "valid config",
+			cfg: &Config{
+				Targets: []*confignet.TCPAddrConfig{
+					{
+						Endpoint: "opentelemetry.io:443",
+						DialerConfig: confignet.DialerConfig{
+							Timeout: 3 * time.Second,
+						},
+					},
+					{
+						Endpoint: "opentelemetry.io:8080",
+						DialerConfig: confignet.DialerConfig{
+							Timeout: 1 * time.Second,
+						},
+					},
+					{
+						Endpoint: "111.222.33.44:10000",
+						DialerConfig: confignet.DialerConfig{
+							Timeout: 5 * time.Second,
+						},
+					},
+				},
+				ControllerConfig: scraperhelper.NewDefaultControllerConfig(),
+			},
+			expectedErr: nil,
+		},
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.desc, func(t *testing.T) {
+			actualErr := tc.cfg.Validate()
+			if tc.expectedErr != nil {
+				require.EqualError(t, actualErr, tc.expectedErr.Error())
+			} else {
+				require.NoError(t, actualErr)
+			}
+		})
+	}
+}

receiver/tcpcheckreceiver/doc.go

@@ -0,0 +1,6 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+package tcpcheckreceiver // import "github.com/open-telemetry/opentelemetry-collector-contrib/receiver/tcpcheckreceiver"
+
+//go:generate mdatagen metadata.yaml

receiver/tcpcheckreceiver/documentation.md

@@ -0,0 +1,56 @@
+[comment]: <> (Code generated by mdatagen. DO NOT EDIT.)
+
+# tcpcheck
+
+## Default Metrics
+
+The following metrics are emitted by default. Each of them can be disabled by applying the following configuration:
+
+```yaml
+metrics:
+  <metric_name>:
+    enabled: false
+```
+
+### tcpcheck.duration
+
+Measures the duration of TCP connection.
+
+| Unit | Metric Type | Value Type |
+| ---- | ----------- | ---------- |
+| ms | Gauge | Int |
+
+#### Attributes
+
+| Name | Description | Values |
+| ---- | ----------- | ------ |
+| tcpcheck.endpoint | TCP endpoint | Any Str |
+
+### tcpcheck.error
+
+Records errors occurring during TCP check.
+
+| Unit | Metric Type | Value Type | Aggregation Temporality | Monotonic |
+| ---- | ----------- | ---------- | ----------------------- | --------- |
+| {error} | Sum | Int | Cumulative | true |
+
+#### Attributes
+
+| Name | Description | Values |
+| ---- | ----------- | ------ |
+| tcpcheck.endpoint | TCP endpoint | Any Str |
+| error.code | Error code recorded during check | Any Str |
+
+### tcpcheck.status
+
+1 if the TCP client successfully connected, otherwise 0.
+
+| Unit | Metric Type | Value Type |
+| ---- | ----------- | ---------- |
+| 1 | Gauge | Int |
+
+#### Attributes
+
+| Name | Description | Values |
+| ---- | ----------- | ------ |
+| tcpcheck.endpoint | TCP endpoint | Any Str |