chore(config): Enable pedantic lints for loading and schemas

src/config/loading/config_builder.rs

@@ -20,32 +20,45 @@ pub struct ConfigBuilderLoader {
 
 impl ConfigBuilderLoader {
     /// Sets whether to interpolate environment variables in the config.
+    #[must_use]
     pub const fn interpolate_env(mut self, interpolate: bool) -> Self {
         self.interpolate_env = interpolate;
         self
     }
 
     /// Sets the secrets map for secret interpolation.
+    #[must_use]
     pub fn secrets(mut self, secrets: HashMap<String, String>) -> Self {
         self.secrets = secrets;
         self
     }
 
     /// Sets whether to allow empty configuration.
+    #[must_use]
     pub const fn allow_empty(mut self, allow_empty: bool) -> Self {
         self.builder.allow_empty = allow_empty;
         self
     }
 
-    /// Builds the ConfigBuilderLoader and loads configuration from the specified paths.
+    /// Builds the `ConfigBuilderLoader` and loads configuration from the specified paths.
+    // https://github.com/vectordotdev/vector/issues/23659
+    #[allow(
+        clippy::missing_errors_doc,
+        reason = "Audit and document the existing error contracts separately from lint enforcement."
+    )]
     pub fn load_from_paths(
         self,
         config_paths: &[super::ConfigPath],
     ) -> Result<ConfigBuilder, Vec<String>> {
         super::loader_from_paths(self, config_paths)
     }
 
-    /// Builds the ConfigBuilderLoader and loads configuration from an input reader.
+    /// Builds the `ConfigBuilderLoader` and loads configuration from an input reader.
+    // https://github.com/vectordotdev/vector/issues/23659
+    #[allow(
+        clippy::missing_errors_doc,
+        reason = "Audit and document the existing error contracts separately from lint enforcement."
+    )]
     pub fn load_from_input<R: Read>(
         self,
         input: R,
@@ -113,7 +126,7 @@ impl Process for ConfigBuilderLoader {
             None => {
                 self.builder.append(deserialize_config_map(map)?)?;
             }
-        };
+        }
 
         Ok(())
     }

src/config/loading/interpolation.rs

@@ -6,6 +6,15 @@ use serde_json::Value;
 use super::representation::ConfigMap;
 
 /// Interpolates environment variables in string leaves without changing keys or value types.
+// https://github.com/vectordotdev/vector/issues/23659
+#[allow(
+    clippy::implicit_hasher,
+    reason = "Keep the current collection type and API bounds during the lint rollout."
+)]
+#[allow(
+    clippy::missing_errors_doc,
+    reason = "Audit and document the existing error contracts separately from lint enforcement."
+)]
 pub fn interpolate_config_map_with_env_vars(
     map: &ConfigMap,
     vars: &HashMap<String, String>,
@@ -73,6 +82,15 @@ pub static ENVIRONMENT_VARIABLE_INTERPOLATION_REGEX: LazyLock<Regex> = LazyLock:
 });
 
 /// Result<interpolated config, errors>
+// https://github.com/vectordotdev/vector/issues/23659
+#[allow(
+    clippy::implicit_hasher,
+    reason = "Keep the current collection type and API bounds during the lint rollout."
+)]
+#[allow(
+    clippy::missing_errors_doc,
+    reason = "Audit and document the existing error contracts separately from lint enforcement."
+)]
 pub fn interpolate(input: &str, vars: &HashMap<String, String>) -> Result<String, Vec<String>> {
     let mut errors = Vec::new();
 
@@ -83,7 +101,7 @@ pub fn interpolate(input: &str, vars: &HashMap<String, String>) -> Result<String
             caps.get(1)
                 .or_else(|| caps.get(2))
                 .map(|m| m.as_str())
-                .map(|name| {
+                .map_or("$", |name| {
                     // Get the value and check for newlines (LF or CR)
                     let val = vars.get(name).and_then(|v| {
                         if v.contains(['\n', '\r']) {
@@ -125,7 +143,6 @@ pub fn interpolate(input: &str, vars: &HashMap<String, String>) -> Result<String
                         }),
                     }
                 })
-                .unwrap_or("$")
                 .to_string()
         })
         .into_owned();
@@ -188,7 +205,7 @@ mod test {
             ("FOOBAR".into(), "cats".into()),
             // Java commonly uses .s in env var names
             ("FOO.BAR".into(), "turtles".into()),
-            ("EMPTY".into(), "".into()),
+            ("EMPTY".into(), String::new()),
         ]
         .into_iter()
         .collect();

src/config/loading/loader.rs

@@ -35,6 +35,7 @@ impl ComponentHint {
 
     /// Joins a component sub-folder to a provided path, for traversal. Since `Self` is a
     /// `Copy`, this is more efficient to pass by value than ref.
+    #[must_use]
     pub fn join_path(self, path: &Path) -> PathBuf {
         path.join(self.as_component_field())
     }
@@ -49,7 +50,10 @@ impl ComponentHint {
 pub(super) mod process {
     use std::io::Read;
 
-    use super::*;
+    use super::{
+        ComponentHint, ConfigMap, Format, Path, Value, component_name, deserialize_config,
+        merge_with_value, open_file, read_dir,
+    };
 
     /// This trait contains methods that deserialize files/folders. There are a few methods
     /// in here with subtly different names that can be hidden from public view, hence why
@@ -71,6 +75,15 @@ pub(super) mod process {
 
         /// Helper method used by other methods to recursively handle file/dir loading, merging
         /// values against a provided configuration map.
+        // https://github.com/vectordotdev/vector/issues/23659
+        #[allow(
+            clippy::manual_let_else,
+            reason = "Keep the existing branching and control flow during the lint rollout."
+        )]
+        #[allow(
+            clippy::unnecessary_debug_formatting,
+            reason = "Preserve the existing diagnostic text and escaping behavior."
+        )]
         fn load_dir_into(
             &mut self,
             path: &Path,
@@ -94,8 +107,7 @@ pub(super) mod process {
                             if !entry
                                 .file_name()
                                 .and_then(|name| name.to_str())
-                                .map(|name| name.starts_with('.'))
-                                .unwrap_or(false)
+                                .is_some_and(|name| name.starts_with('.'))
                             {
                                 folders.push(entry);
                             }
@@ -106,7 +118,7 @@ pub(super) mod process {
                             "Could not read entry in config dir: {path:?}, {err}."
                         ));
                     }
-                };
+                }
             }
 
             for entry in files {
@@ -217,6 +229,11 @@ where
     /// Consumes Self, and returns the final, deserialized `T`.
     fn take(self) -> T;
 
+    // https://github.com/vectordotdev/vector/issues/23659
+    #[allow(
+        clippy::missing_errors_doc,
+        reason = "Audit and document the existing error contracts separately from lint enforcement."
+    )]
     fn load_from_str<R: std::io::Read>(
         &mut self,
         input: R,
@@ -230,6 +247,11 @@ where
 
     /// Deserializes a file with the provided format, and makes the result available via `take`.
     /// Returns a vector of non-fatal warnings on success, or a vector of error strings on failure.
+    // https://github.com/vectordotdev/vector/issues/23659
+    #[allow(
+        clippy::missing_errors_doc,
+        reason = "Audit and document the existing error contracts separately from lint enforcement."
+    )]
     fn load_from_file(&mut self, path: &Path, format: Format) -> Result<(), Vec<String>> {
         if let Some((_, map)) = self.load_file(path, format)? {
             self.merge(map, None)?;
@@ -241,6 +263,11 @@ where
 
     /// Deserializes a dir with the provided format, and makes the result available via `take`.
     /// Returns a vector of non-fatal warnings on success, or a vector of error strings on failure.
+    // https://github.com/vectordotdev/vector/issues/23659
+    #[allow(
+        clippy::missing_errors_doc,
+        reason = "Audit and document the existing error contracts separately from lint enforcement."
+    )]
     fn load_from_dir(&mut self, path: &Path) -> Result<(), Vec<String>> {
         // Iterator containing component-specific sub-folders to attempt traversing into.
         let hints = [

src/config/loading/mod.rs

@@ -1,3 +1,5 @@
+#![warn(clippy::pedantic)]
+
 mod config_builder;
 pub(crate) mod interpolation;
 mod loader;
@@ -34,6 +36,11 @@ static ALLOW_ENV_VAR_INTERPOLATION: OnceLock<bool> = OnceLock::new();
 
 /// Sets whether environment variable interpolation is enabled for the process.
 /// Must be called exactly once at startup before any config loading.
+// https://github.com/vectordotdev/vector/issues/23659
+#[allow(
+    clippy::missing_panics_doc,
+    reason = "Audit and document the existing panic conditions separately from lint enforcement."
+)]
 pub fn set_env_var_interpolation(allow: bool) {
     ALLOW_ENV_VAR_INTERPOLATION
         .set(allow)
@@ -56,7 +63,7 @@ pub(super) fn component_name<P: AsRef<Path> + Debug>(path: P) -> Result<String,
     path.as_ref()
         .file_stem()
         .and_then(|name| name.to_str())
-        .map(|name| name.to_string())
+        .map(std::string::ToString::to_string)
         .ok_or_else(|| vec![format!("Couldn't get component name for file: {path:?}")])
 }
 
@@ -91,11 +98,16 @@ pub fn merge_path_lists(
 
 /// Expand a list of paths (potentially containing glob patterns) into real
 /// config paths, replacing it with the default paths when empty.
+// https://github.com/vectordotdev/vector/issues/23659
+#[allow(
+    clippy::missing_panics_doc,
+    reason = "Audit and document the existing panic conditions separately from lint enforcement."
+)]
 pub fn process_paths(config_paths: &[ConfigPath]) -> Option<Vec<ConfigPath>> {
-    let starting_paths = if !config_paths.is_empty() {
-        config_paths.to_owned()
-    } else {
+    let starting_paths = if config_paths.is_empty() {
         default_config_paths()
+    } else {
+        config_paths.to_owned()
     };
 
     let mut paths = Vec::new();
@@ -125,7 +137,7 @@ pub fn process_paths(config_paths: &[ConfigPath]) -> Option<Vec<ConfigPath>> {
             }
             ConfigPath::Dir(_) => {
                 for path in matches {
-                    paths.push(ConfigPath::Dir(path))
+                    paths.push(ConfigPath::Dir(path));
                 }
             }
         }
@@ -143,6 +155,11 @@ pub fn process_paths(config_paths: &[ConfigPath]) -> Option<Vec<ConfigPath>> {
     Some(paths)
 }
 
+// https://github.com/vectordotdev/vector/issues/23659
+#[allow(
+    clippy::missing_errors_doc,
+    reason = "Audit and document the existing error contracts separately from lint enforcement."
+)]
 pub fn load_from_paths(config_paths: &[ConfigPath]) -> Result<Config, Vec<String>> {
     let builder = ConfigBuilderLoader::default().load_from_paths(config_paths)?;
     let (config, build_warnings) = builder.build_with_warnings()?;
@@ -157,6 +174,11 @@ pub fn load_from_paths(config_paths: &[ConfigPath]) -> Result<Config, Vec<String
 /// Loads a configuration from paths. Handle secret replacement and if a provider is present
 /// in the builder, the config is used as bootstrapping for a remote source. Otherwise,
 /// provider instantiation is skipped.
+// https://github.com/vectordotdev/vector/issues/23659
+#[allow(
+    clippy::missing_errors_doc,
+    reason = "Audit and document the existing error contracts separately from lint enforcement."
+)]
 pub async fn load_from_paths_with_provider_and_secrets(
     config_paths: &[ConfigPath],
     signal_handler: &mut signal::SignalHandler,
@@ -196,6 +218,11 @@ pub(crate) async fn load_builder_from_paths_with_secrets(
         .load_from_paths(config_paths)
 }
 
+// https://github.com/vectordotdev/vector/issues/23659
+#[allow(
+    clippy::missing_errors_doc,
+    reason = "Audit and document the existing error contracts separately from lint enforcement."
+)]
 pub async fn load_from_str_with_secrets(
     input: &str,
     format: Format,
@@ -240,7 +267,7 @@ where
     L: Loader<T> + Process,
     R: std::io::Read,
 {
-    loader.load_from_str(input, format).map(|_| loader.take())
+    loader.load_from_str(input, format).map(|()| loader.take())
 }
 
 /// Iterators over `ConfigPaths`, and processes a file/dir according to a provided `Loader`.
@@ -265,14 +292,12 @@ where
                 ) {
                     Ok(()) => {}
                     Err(errs) => errors.extend(errs),
-                };
-            }
-            ConfigPath::Dir(path) => {
-                match loader.load_from_dir(path) {
-                    Ok(()) => {}
-                    Err(errs) => errors.extend(errs),
-                };
+                }
             }
+            ConfigPath::Dir(path) => match loader.load_from_dir(path) {
+                Ok(()) => {}
+                Err(errs) => errors.extend(errs),
+            },
         }
     }
 
@@ -284,12 +309,22 @@ where
 }
 
 /// Uses `SourceLoader` to process `ConfigPaths`, deserializing to a JSON object.
+// https://github.com/vectordotdev/vector/issues/23659
+#[allow(
+    clippy::missing_errors_doc,
+    reason = "Audit and document the existing error contracts separately from lint enforcement."
+)]
 pub fn load_source_from_paths(
     config_paths: &[ConfigPath],
 ) -> Result<serde_json::Map<String, serde_json::Value>, Vec<String>> {
     loader_from_paths(SourceLoader::new(), config_paths)
 }
 
+// https://github.com/vectordotdev/vector/issues/23659
+#[allow(
+    clippy::missing_errors_doc,
+    reason = "Audit and document the existing error contracts separately from lint enforcement."
+)]
 pub fn load_from_str(input: &str, format: Format) -> Result<Config, Vec<String>> {
     let builder = load_from_inputs(std::iter::once((input.as_bytes(), format)))?;
     let (config, build_warnings) = builder.build_with_warnings()?;
@@ -310,7 +345,7 @@ fn load_from_inputs(
     for (input, format) in inputs {
         if let Err(errs) = load(input, format).and_then(|n| config.append(n)) {
             // TODO: add back paths
-            errors.extend(errs.iter().map(|e| e.to_string()));
+            errors.extend(errs.iter().cloned());
         }
     }
 
@@ -321,6 +356,11 @@ fn load_from_inputs(
     }
 }
 
+// https://github.com/vectordotdev/vector/issues/23659
+#[allow(
+    clippy::missing_errors_doc,
+    reason = "Audit and document the existing error contracts separately from lint enforcement."
+)]
 pub fn prepare_input<R: std::io::Read>(
     mut input: R,
     interpolate_env: bool,
@@ -349,6 +389,11 @@ pub fn prepare_input<R: std::io::Read>(
     }
 }
 
+// https://github.com/vectordotdev/vector/issues/23659
+#[allow(
+    clippy::missing_errors_doc,
+    reason = "Audit and document the existing error contracts separately from lint enforcement."
+)]
 pub fn load<R: std::io::Read, T>(input: R, format: Format) -> Result<T, Vec<String>>
 where
     T: serde::de::DeserializeOwned,

src/config/loading/representation.rs

@@ -269,6 +269,11 @@ mod tests {
         _count: u64,
     }
 
+    // https://github.com/vectordotdev/vector/issues/23659
+    #[allow(
+        clippy::unnecessary_wraps,
+        reason = "Preserve the existing return type and caller contracts during the lint rollout."
+    )]
     fn default_optional_value() -> Option<String> {
         Some("default".to_string())
     }