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LogMiddleware

gemini_adk_rs::middleware::log

Struct LogMiddleware 

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pub struct LogMiddleware;
Expand description

Logs agent and tool lifecycle events.

Uses tracing macros for structured logging; the events are no-ops until a subscriber is installed.

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impl LogMiddleware

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pub fn new() -> Self

Create a new log middleware.

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impl Default for LogMiddleware

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fn default() -> Self

Returns the “default value” for a type. Read more
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impl Middleware for LogMiddleware

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fn name(&self) -> &str

Unique name for this middleware (used in logging/debugging).
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fn before_agent<'life0, 'life1, 'async_trait>( &'life0 self, _ctx: &'life1 InvocationContext, ) -> Pin<Box<dyn Future<Output = Result<(), AgentError>> + Send + 'async_trait>>
where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait,

Called before an agent begins execution.
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fn after_agent<'life0, 'life1, 'async_trait>( &'life0 self, _ctx: &'life1 InvocationContext, ) -> Pin<Box<dyn Future<Output = Result<(), AgentError>> + Send + 'async_trait>>
where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait,

Called after an agent completes execution.
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fn before_tool<'life0, 'life1, 'async_trait>( &'life0 self, call: &'life1 FunctionCall, ) -> Pin<Box<dyn Future<Output = Result<(), AgentError>> + Send + 'async_trait>>
where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait,

Called before a tool is invoked.
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fn after_tool<'life0, 'life1, 'life2, 'async_trait>( &'life0 self, call: &'life1 FunctionCall, _result: &'life2 Value, ) -> Pin<Box<dyn Future<Output = Result<(), AgentError>> + Send + 'async_trait>>
where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait, 'life2: 'async_trait,

Called after a tool completes successfully.
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fn on_tool_error<'life0, 'life1, 'life2, 'async_trait>( &'life0 self, call: &'life1 FunctionCall, err: &'life2 ToolError, ) -> Pin<Box<dyn Future<Output = Result<(), AgentError>> + Send + 'async_trait>>
where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait, 'life2: 'async_trait,

Called when a tool execution fails.
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fn on_error<'life0, 'life1, 'async_trait>( &'life0 self, err: &'life1 AgentError, ) -> Pin<Box<dyn Future<Output = Result<(), AgentError>> + Send + 'async_trait>>
where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait,

Called when an agent error occurs.
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fn on_event<'life0, 'life1, 'async_trait>( &'life0 self, _event: &'life1 AgentEvent, ) -> Pin<Box<dyn Future<Output = Result<(), AgentError>> + Send + 'async_trait>>
where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait,

Called when an agent event is emitted.
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fn before_model<'life0, 'life1, 'async_trait>( &'life0 self, _request: &'life1 LlmRequest, ) -> Pin<Box<dyn Future<Output = Result<Option<LlmResponse>, AgentError>> + Send + 'async_trait>>
where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait,

Called before an LLM model call is made. Return Some(LlmResponse) to skip the LLM call and use the returned response instead (e.g., for caching, guardrails). Return None to proceed.
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fn after_model<'life0, 'life1, 'life2, 'async_trait>( &'life0 self, _request: &'life1 LlmRequest, _response: &'life2 LlmResponse, ) -> Pin<Box<dyn Future<Output = Result<Option<LlmResponse>, AgentError>> + Send + 'async_trait>>
where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait, 'life2: 'async_trait,

Called after an LLM model call completes. Return Some(LlmResponse) to replace the model’s response (e.g., for output filtering, safety). Return None to use the original response.
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fn transform_request<'life0, 'life1, 'async_trait>( &'life0 self, _request: &'life1 mut LlmRequest, ) -> Pin<Box<dyn Future<Output = Result<(), AgentError>> + Send + 'async_trait>>
where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait,

Called with the fully-built request before it is sent to the model, allowing in-place mutation (e.g. trimming or rewriting conversation history). Runs ahead of Middleware::before_model. This mirrors the mutable before_model_callback request hook in the ADK Python SDK.
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fn timeout(&self) -> Option<Duration>

Maximum wall-clock duration this middleware imposes on the agent run. None (the default) means no limit. The agent enforces the tightest timeout across its middleware chain by bounding the whole run.

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