154 lines
3.9 KiB
Rust
154 lines
3.9 KiB
Rust
use std::time::Duration;
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/// Events the observer can record
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#[derive(Debug, Clone)]
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pub enum ObserverEvent {
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AgentStart {
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provider: String,
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model: String,
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},
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/// A request is about to be sent to an LLM provider.
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///
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/// This is emitted immediately before a provider call so observers can print
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/// user-facing progress without leaking prompt contents.
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LlmRequest {
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provider: String,
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model: String,
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messages_count: usize,
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},
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/// Result of a single LLM provider call.
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LlmResponse {
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provider: String,
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model: String,
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duration: Duration,
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success: bool,
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error_message: Option<String>,
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},
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AgentEnd {
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provider: String,
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model: String,
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duration: Duration,
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tokens_used: Option<u64>,
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cost_usd: Option<f64>,
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},
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/// A tool call is about to be executed.
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ToolCallStart {
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tool: String,
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},
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ToolCall {
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tool: String,
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duration: Duration,
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success: bool,
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},
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/// The agent produced a final answer for the current user message.
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TurnComplete,
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ChannelMessage {
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channel: String,
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direction: String,
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},
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HeartbeatTick,
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Error {
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component: String,
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message: String,
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},
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}
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/// Numeric metrics
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#[derive(Debug, Clone)]
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pub enum ObserverMetric {
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RequestLatency(Duration),
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TokensUsed(u64),
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ActiveSessions(u64),
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QueueDepth(u64),
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}
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/// Core observability trait — implement for any backend
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pub trait Observer: Send + Sync + 'static {
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/// Record a discrete event
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fn record_event(&self, event: &ObserverEvent);
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/// Record a numeric metric
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fn record_metric(&self, metric: &ObserverMetric);
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/// Flush any buffered data (no-op for most backends)
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fn flush(&self) {}
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/// Human-readable name of this observer
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fn name(&self) -> &str;
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/// Downcast to `Any` for backend-specific operations
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fn as_any(&self) -> &dyn std::any::Any;
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use parking_lot::Mutex;
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use std::time::Duration;
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#[derive(Default)]
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struct DummyObserver {
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events: Mutex<u64>,
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metrics: Mutex<u64>,
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}
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impl Observer for DummyObserver {
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fn record_event(&self, _event: &ObserverEvent) {
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let mut guard = self.events.lock();
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*guard += 1;
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}
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fn record_metric(&self, _metric: &ObserverMetric) {
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let mut guard = self.metrics.lock();
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*guard += 1;
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}
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fn name(&self) -> &str {
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"dummy-observer"
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}
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fn as_any(&self) -> &dyn std::any::Any {
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self
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}
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}
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#[test]
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fn observer_records_events_and_metrics() {
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let observer = DummyObserver::default();
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observer.record_event(&ObserverEvent::HeartbeatTick);
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observer.record_event(&ObserverEvent::Error {
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component: "test".into(),
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message: "boom".into(),
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});
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observer.record_metric(&ObserverMetric::TokensUsed(42));
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assert_eq!(*observer.events.lock(), 2);
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assert_eq!(*observer.metrics.lock(), 1);
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}
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#[test]
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fn observer_default_flush_and_as_any_work() {
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let observer = DummyObserver::default();
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observer.flush();
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assert_eq!(observer.name(), "dummy-observer");
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assert!(observer.as_any().downcast_ref::<DummyObserver>().is_some());
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}
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#[test]
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fn observer_event_and_metric_are_cloneable() {
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let event = ObserverEvent::ToolCall {
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tool: "shell".into(),
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duration: Duration::from_millis(10),
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success: true,
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};
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let metric = ObserverMetric::RequestLatency(Duration::from_millis(8));
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let cloned_event = event.clone();
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let cloned_metric = metric.clone();
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assert!(matches!(cloned_event, ObserverEvent::ToolCall { .. }));
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assert!(matches!(cloned_metric, ObserverMetric::RequestLatency(_)));
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}
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}
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