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135 lines
4.2 KiB
Python
135 lines
4.2 KiB
Python
"""Tests for the monitoring emitter: hot-path invariant + subscriber fan-out."""
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from __future__ import annotations
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import time
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import threading
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from agent.monitoring.emitter import MonitoringEmitter
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from agent.monitoring.events import GatewayHealthEvent
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def test_emit_never_raises_when_disabled():
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em = MonitoringEmitter(enabled=False)
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em.emit({"event": "gateway_health", "name": "gateway.health_snapshot"})
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assert em.stats()["queued"] == 0
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em.close()
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def test_process_singleton_stays_dormant_until_subscribed():
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from agent.monitoring import emitter
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emitter.reset_emitter_for_tests()
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try:
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emitter.emit({"event": "gateway_health", "name": "gateway.lifecycle"})
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singleton = emitter.get_emitter()
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assert singleton.stats()["queued"] == 0
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assert singleton._started is False
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subscriber = lambda _batch: None # noqa: E731
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singleton.subscribe(subscriber)
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emitter.emit({"event": "gateway_health", "name": "gateway.lifecycle"})
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assert singleton._started is True
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singleton.unsubscribe(subscriber)
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finally:
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emitter.reset_emitter_for_tests()
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def test_emit_accepts_dataclass_and_dict(tmp_path):
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em = MonitoringEmitter()
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seen: list = []
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em.subscribe(lambda batch: seen.extend(batch))
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em.emit(GatewayHealthEvent(name="gateway.health_snapshot", active_agents=2))
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em.emit({"event": "gateway_diagnostic", "name": "platform.fatal",
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"subsystem": "platform.slack"})
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em.flush()
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em.close()
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kinds = {ev.get("event") for ev in seen}
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assert kinds == {"gateway_health", "gateway_diagnostic"}
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health = next(ev for ev in seen if ev["event"] == "gateway_health")
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assert health["active_agents"] == 2
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assert "ts_ns" in health
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def test_subscriber_failure_is_isolated():
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em = MonitoringEmitter()
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good: list = []
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def bad(batch):
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raise RuntimeError("boom")
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em.subscribe(bad)
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em.subscribe(lambda batch: good.extend(batch))
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em.emit({"event": "gateway_health", "name": "gateway.lifecycle"})
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em.flush()
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em.close()
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assert len(good) == 1 # the raising subscriber did not break fan-out
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def test_flush_waits_for_in_flight_subscriber_delivery():
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em = MonitoringEmitter()
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subscriber_started = threading.Event()
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release_subscriber = threading.Event()
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flush_finished = threading.Event()
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def blocking_subscriber(_batch):
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subscriber_started.set()
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release_subscriber.wait(timeout=2.0)
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em.subscribe(blocking_subscriber)
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em.emit({"event": "gateway_health", "name": "gateway.exit"})
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assert subscriber_started.wait(timeout=1.0)
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flush_thread = threading.Thread(
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target=lambda: (em.flush(timeout=1.0), flush_finished.set()),
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daemon=True,
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)
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flush_thread.start()
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try:
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assert not flush_finished.wait(timeout=0.1)
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finally:
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release_subscriber.set()
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assert flush_finished.wait(timeout=1.0)
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em.close()
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def test_unsubscribe_stops_delivery():
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em = MonitoringEmitter()
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seen: list = []
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cb = lambda batch: seen.extend(batch) # noqa: E731
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em.subscribe(cb)
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em.emit({"event": "gateway_health", "name": "a"})
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em.flush()
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em.unsubscribe(cb)
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em.emit({"event": "gateway_health", "name": "b"})
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em.flush()
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em.close()
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assert [ev["name"] for ev in seen] == ["a"]
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def test_queue_full_drops_oldest():
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em = MonitoringEmitter()
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# Fill the queue without a dispatcher running by not letting it start:
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# emit() starts the thread, so instead assert drop accounting via stats
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# after a burst larger than the queue.
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for i in range(11_000):
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em.emit({"event": "gateway_health", "name": f"e{i}"})
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# Give the dispatcher a moment; total dispatched + queued + dropped == emitted.
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em.flush(timeout=5.0)
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stats = em.stats()
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em.close()
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assert stats["dropped"] >= 0
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assert stats["dispatched"] + stats["queued"] + stats["dropped"] >= 10_000
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def test_hot_path_is_fast():
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em = MonitoringEmitter()
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start = time.perf_counter()
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for _ in range(1_000):
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em.emit({"event": "gateway_health", "name": "gateway.health_snapshot"})
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elapsed = time.perf_counter() - start
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em.close()
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# 1000 emits should be far under a second even on slow CI.
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assert elapsed < 1.0
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