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use forge_domain::{
Conversation, EndPayload, EventData, EventHandle, RequestPayload, ResponsePayload,
StartPayload, ToolcallEndPayload, ToolcallStartPayload,
};
use tracing::{debug, info, warn};
/// Handler that provides comprehensive tracing/logging for all lifecycle events
///
/// This handler logs important information at various stages of the
/// orchestration:
/// - Start: Logs conversation and agent initialization
/// - Request: Logs each request iteration
/// - Response: Logs token usage, costs, and conversation metrics
/// - ToolcallStart: Logs tool execution start
/// - ToolcallEnd: Logs tool failures with details
/// - End: Logs title generation when available
#[derive(Clone)]
pub struct TracingHandler;
impl TracingHandler {
pub fn new() -> Self {
Self
}
}
#[async_trait]
impl EventHandle<EventData<StartPayload>> for TracingHandler {
async fn handle(
&self,
event: &EventData<StartPayload>,
conversation: &mut Conversation,
) -> anyhow::Result<()> {
debug!(
conversation_id = %conversation.id,
agent = %event.agent.id,
model = %event.model_id,
"Initializing agent"
);
Ok(())
}
}
#[async_trait]
impl EventHandle<EventData<RequestPayload>> for TracingHandler {
async fn handle(
&self,
_event: &EventData<RequestPayload>,
_conversation: &mut Conversation,
) -> anyhow::Result<()> {
// Request events are logged but don't need specific logging per request
// The Start event logs initialization, Response events log the results
Ok(())
}
}
#[async_trait]
impl EventHandle<EventData<ResponsePayload>> for TracingHandler {
async fn handle(
&self,
event: &EventData<ResponsePayload>,
conversation: &mut Conversation,
) -> anyhow::Result<()> {
let message = &event.payload.message;
if let Some(context) = &conversation.context {
info!(
conversation_id = %conversation.id,
conversation_length = context.messages.len(),
token_usage = format!("{}", message.usage.prompt_tokens),
total_tokens = format!("{}", message.usage.total_tokens),
cached_tokens = format!("{}", message.usage.cached_tokens),
cost = message.usage.cost.unwrap_or_default(),
finish_reason = message.finish_reason.as_ref().map_or("", |reason| reason.into()),
"Processing usage information"
);
}
debug!(
agent_id = %event.agent.id,
tool_call_count = message.tool_calls.len(),
"Tool call count"
);
Ok(())
}
}
#[async_trait]
impl EventHandle<EventData<ToolcallStartPayload>> for TracingHandler {
async fn handle(
&self,
event: &EventData<ToolcallStartPayload>,
_conversation: &mut Conversation,
) -> anyhow::Result<()> {
let tool_call = &event.payload.tool_call;
debug!(
agent_id = %event.agent.id,
tool_name = %tool_call.name,
call_id = ?tool_call.call_id,
arguments = %tool_call.arguments.to_owned().into_string(),
"Tool call started"
);
Ok(())
}
}
#[async_trait]
impl EventHandle<EventData<ToolcallEndPayload>> for TracingHandler {
async fn handle(
&self,
event: &EventData<ToolcallEndPayload>,
_conversation: &mut Conversation,
) -> anyhow::Result<()> {
let tool_call = &event.payload.tool_call;
let result = &event.payload.result;
if result.is_error() {
warn!(
agent_id = %event.agent.id,
name = %tool_call.name,
call_id = ?tool_call.call_id,
arguments = %tool_call.arguments.to_owned().into_string(),
output = ?result.output,
"Tool call failed",
);
}
Ok(())
}
}
#[async_trait]
impl EventHandle<EventData<EndPayload>> for TracingHandler {
async fn handle(
&self,
_event: &EventData<EndPayload>,
conversation: &mut Conversation,
) -> anyhow::Result<()> {
if let Some(title) = &conversation.title {
debug!(
conversation_id = %conversation.id,
title,
"Title generated for conversation"
);
}
Ok(())
}
}
#[cfg(test)]
mod tests {
use forge_domain::{
Agent, ChatCompletionMessageFull, ModelId, ToolCallId, ToolName, ToolResult,
};
use super::*;
fn test_agent() -> Agent {
Agent::new(
"test-agent",
"test-provider".to_string().into(),
ModelId::new("test-model"),
)
}
fn test_model_id() -> ModelId {
ModelId::new("test-model")
}
#[tokio::test]
async fn test_tracing_handler_start() {
let handler = TracingHandler::new();
let mut conversation = Conversation::generate();
let event = EventData::new(test_agent(), test_model_id(), StartPayload);
// Should not panic
handler.handle(&event, &mut conversation).await.unwrap();
}
#[tokio::test]
async fn test_tracing_handler_request() {
let handler = TracingHandler::new();
let mut conversation = Conversation::generate();
let event = EventData::new(test_agent(), test_model_id(), RequestPayload::new(0));
// Should not panic
handler.handle(&event, &mut conversation).await.unwrap();
}
#[tokio::test]
async fn test_tracing_handler_response() {
let handler = TracingHandler::new();
let mut conversation = Conversation::generate();
let message = ChatCompletionMessageFull {
content: "test".to_string(),
thought_signature: None,
reasoning: None,
reasoning_details: None,
tool_calls: vec![],
usage: Default::default(),
finish_reason: None,
phase: None,
};
let event = EventData::new(test_agent(), test_model_id(), ResponsePayload::new(message));
// Should not panic
handler.handle(&event, &mut conversation).await.unwrap();
}
#[tokio::test]
async fn test_tracing_handler_toolcall_end_error() {
let handler = TracingHandler::new();
let mut conversation = Conversation::generate();
let tool_call = forge_domain::ToolCallFull {
name: ToolName::from("test-tool"),
call_id: Some(ToolCallId::new("test-id")),
arguments: serde_json::json!({"key": "value"}).into(),
thought_signature: None,
};
let result = ToolResult::new(ToolName::from("test-tool"))
.call_id(ToolCallId::new("test-id"))
.failure(anyhow::anyhow!("Test error"));
let event = EventData::new(
test_agent(),
test_model_id(),
ToolcallEndPayload::new(tool_call, result),
);
// Should log warning but not panic
handler.handle(&event, &mut conversation).await.unwrap();
}
#[tokio::test]
async fn test_tracing_handler_end_with_title() {
let handler = TracingHandler::new();
let mut conversation = Conversation::generate().title(Some("Test Title".to_string()));
let event = EventData::new(test_agent(), test_model_id(), EndPayload);
// Should log debug message with title
handler.handle(&event, &mut conversation).await.unwrap();
}
}
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