mirror of
https://github.com/bytedance/deer-flow.git
synced 2026-05-23 00:16:48 +00:00
feat: asyncio-native Actor framework with supervision, middleware, and pluggable mailbox
Lightweight actor library built on asyncio primitives (~800 lines): - Actor base class with lifecycle hooks (on_started/on_stopped/on_restart) - ActorRef with tell (fire-and-forget) and ask (request-response) - Supervision: OneForOne/AllForOne strategies with restart limits - Middleware pipeline for cross-cutting concerns - Pluggable Mailbox interface (MemoryMailbox default, RedisMailbox optional) - ReplyRegistry + ReplyChannel: ask() works across any mailbox backend - System-level thread pool for blocking I/O (run_in_executor) - Dead letter handling, poison message quarantine, parallel shutdown - 22 tests + benchmark suite
This commit is contained in:
greatmengqi
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"""Tests for the async Actor framework."""
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import asyncio
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import pytest
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from deerflow.actor import (
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Actor,
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ActorRef,
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ActorSystem,
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AllForOneStrategy,
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Directive,
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Middleware,
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OneForOneStrategy,
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)
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from deerflow.actor.ref import ActorStoppedError
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# ---------------------------------------------------------------------------
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# Basic actors for testing
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# ---------------------------------------------------------------------------
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class EchoActor(Actor):
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async def on_receive(self, message):
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return message
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class CounterActor(Actor):
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async def on_started(self):
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self.count = 0
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async def on_receive(self, message):
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if message == "inc":
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self.count += 1
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elif message == "get":
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return self.count
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class CrashActor(Actor):
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async def on_receive(self, message):
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if message == "crash":
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raise ValueError("boom")
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return "ok"
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class ParentActor(Actor):
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def __init__(self):
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self.child_ref: ActorRef | None = None
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self.restarts = 0
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def supervisor_strategy(self):
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return OneForOneStrategy(max_restarts=3, within_seconds=60)
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async def on_started(self):
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self.child_ref = await self.context.spawn(CrashActor, "child")
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async def on_receive(self, message):
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if message == "get_child":
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return self.child_ref
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class StopOnCrashParent(Actor):
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def supervisor_strategy(self):
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return OneForOneStrategy(decider=lambda _: Directive.stop)
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async def on_started(self):
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self.child_ref = await self.context.spawn(CrashActor, "child")
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async def on_receive(self, message):
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if message == "get_child":
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return self.child_ref
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class AllForOneParent(Actor):
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def supervisor_strategy(self):
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return AllForOneStrategy(max_restarts=2, within_seconds=60)
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async def on_started(self):
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self.c1 = await self.context.spawn(CounterActor, "c1")
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self.c2 = await self.context.spawn(CrashActor, "c2")
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async def on_receive(self, message):
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if message == "get_children":
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return (self.c1, self.c2)
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class LifecycleActor(Actor):
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started = False
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stopped = False
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restarted_with: Exception | None = None
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async def on_started(self):
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LifecycleActor.started = True
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async def on_stopped(self):
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LifecycleActor.stopped = True
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async def on_restart(self, error):
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LifecycleActor.restarted_with = error
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async def on_receive(self, message):
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if message == "crash":
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raise RuntimeError("lifecycle crash")
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return "alive"
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# ---------------------------------------------------------------------------
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# Tests
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# ---------------------------------------------------------------------------
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class TestBasicMessaging:
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@pytest.mark.anyio
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async def test_tell_and_ask(self):
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system = ActorSystem("test")
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ref = await system.spawn(EchoActor, "echo")
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result = await ref.ask("hello")
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assert result == "hello"
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await system.shutdown()
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@pytest.mark.anyio
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async def test_ask_timeout(self):
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class SlowActor(Actor):
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async def on_receive(self, message):
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await asyncio.sleep(10)
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system = ActorSystem("test")
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ref = await system.spawn(SlowActor, "slow")
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with pytest.raises(asyncio.TimeoutError):
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await ref.ask("hi", timeout=0.1)
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await system.shutdown()
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@pytest.mark.anyio
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async def test_tell_fire_and_forget(self):
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system = ActorSystem("test")
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ref = await system.spawn(CounterActor, "counter")
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await ref.tell("inc")
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await ref.tell("inc")
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await ref.tell("inc")
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# Give the actor time to process
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await asyncio.sleep(0.05)
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count = await ref.ask("get")
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assert count == 3
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await system.shutdown()
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@pytest.mark.anyio
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async def test_ask_stopped_actor(self):
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system = ActorSystem("test")
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ref = await system.spawn(EchoActor, "echo")
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ref.stop()
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await asyncio.sleep(0.05)
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with pytest.raises(ActorStoppedError):
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await ref.ask("hello")
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await system.shutdown()
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@pytest.mark.anyio
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async def test_tell_stopped_actor_goes_to_dead_letters(self):
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system = ActorSystem("test")
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ref = await system.spawn(EchoActor, "echo")
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ref.stop()
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await asyncio.sleep(0.05)
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await ref.tell("orphan")
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assert len(system.dead_letters) >= 1
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await system.shutdown()
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class TestActorPath:
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@pytest.mark.anyio
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async def test_root_actor_path(self):
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system = ActorSystem("app")
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ref = await system.spawn(EchoActor, "echo")
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assert ref.path == "/app/echo"
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await system.shutdown()
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@pytest.mark.anyio
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async def test_child_actor_path(self):
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system = ActorSystem("app")
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parent = await system.spawn(ParentActor, "parent")
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child: ActorRef = await parent.ask("get_child")
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assert child.path == "/app/parent/child"
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await system.shutdown()
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class TestLifecycle:
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@pytest.mark.anyio
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async def test_on_started_called(self):
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LifecycleActor.started = False
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system = ActorSystem("test")
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await system.spawn(LifecycleActor, "lc")
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assert LifecycleActor.started is True
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await system.shutdown()
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@pytest.mark.anyio
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async def test_on_stopped_called(self):
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LifecycleActor.stopped = False
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system = ActorSystem("test")
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ref = await system.spawn(LifecycleActor, "lc")
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ref.stop()
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await asyncio.sleep(0.1)
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assert LifecycleActor.stopped is True
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await system.shutdown()
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@pytest.mark.anyio
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async def test_shutdown_stops_all(self):
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system = ActorSystem("test")
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r1 = await system.spawn(EchoActor, "a")
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r2 = await system.spawn(EchoActor, "b")
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await system.shutdown()
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assert not r1.is_alive
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assert not r2.is_alive
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class TestSupervision:
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@pytest.mark.anyio
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async def test_restart_on_crash(self):
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system = ActorSystem("test")
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parent = await system.spawn(ParentActor, "parent")
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child: ActorRef = await parent.ask("get_child")
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# Crash the child
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with pytest.raises(ValueError, match="boom"):
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await child.ask("crash")
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await asyncio.sleep(0.1)
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# Child should still be alive (restarted)
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assert child.is_alive
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result = await child.ask("safe")
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assert result == "ok"
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await system.shutdown()
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@pytest.mark.anyio
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async def test_stop_directive(self):
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system = ActorSystem("test")
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parent = await system.spawn(StopOnCrashParent, "parent")
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child: ActorRef = await parent.ask("get_child")
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with pytest.raises(ValueError, match="boom"):
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await child.ask("crash")
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await asyncio.sleep(0.1)
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assert not child.is_alive
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await system.shutdown()
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@pytest.mark.anyio
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async def test_restart_limit_exceeded(self):
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system = ActorSystem("test")
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class StrictParent(Actor):
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def supervisor_strategy(self):
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return OneForOneStrategy(max_restarts=2, within_seconds=60)
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async def on_started(self):
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self.child_ref = await self.context.spawn(CrashActor, "child")
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async def on_receive(self, message):
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return self.child_ref
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parent = await system.spawn(StrictParent, "parent")
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child: ActorRef = await parent.ask("any")
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# Exhaust restart limit
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for _ in range(3):
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try:
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await child.ask("crash")
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except (ValueError, ActorStoppedError):
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pass
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await asyncio.sleep(0.05)
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# After exceeding limit, child should be stopped
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assert not child.is_alive
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await system.shutdown()
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@pytest.mark.anyio
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async def test_all_for_one_restarts_siblings(self):
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system = ActorSystem("test")
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parent = await system.spawn(AllForOneParent, "parent")
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c1, c2 = await parent.ask("get_children")
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# Increment counter on c1
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await c1.tell("inc")
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await asyncio.sleep(0.05)
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count_before = await c1.ask("get")
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assert count_before == 1
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# Crash c2 → AllForOne should restart both
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try:
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await c2.ask("crash")
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except ValueError:
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pass
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await asyncio.sleep(0.1)
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# c1 was restarted, counter should be 0
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count_after = await c1.ask("get")
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assert count_after == 0
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await system.shutdown()
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class TestDeadLetters:
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@pytest.mark.anyio
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async def test_dead_letter_callback(self):
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received = []
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system = ActorSystem("test")
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system.on_dead_letter(lambda dl: received.append(dl))
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ref = await system.spawn(EchoActor, "echo")
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ref.stop()
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await asyncio.sleep(0.05)
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await ref.tell("orphan")
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assert len(received) >= 1
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assert received[-1].message == "orphan"
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await system.shutdown()
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class TestDuplicateNames:
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@pytest.mark.anyio
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async def test_duplicate_root_name_raises(self):
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system = ActorSystem("test")
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await system.spawn(EchoActor, "echo")
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with pytest.raises(ValueError, match="already exists"):
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await system.spawn(EchoActor, "echo")
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await system.shutdown()
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# ---------------------------------------------------------------------------
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# Middleware tests
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# ---------------------------------------------------------------------------
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class LogMiddleware(Middleware):
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def __init__(self):
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self.log: list[str] = []
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async def on_receive(self, ctx, message, next_fn):
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self.log.append(f"before:{message}")
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result = await next_fn(ctx, message)
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self.log.append(f"after:{result}")
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return result
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async def on_started(self, actor_ref):
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self.log.append("started")
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async def on_stopped(self, actor_ref):
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self.log.append("stopped")
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class TransformMiddleware(Middleware):
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"""Uppercases string messages before passing to actor."""
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async def on_receive(self, ctx, message, next_fn):
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if isinstance(message, str):
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message = message.upper()
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return await next_fn(ctx, message)
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class TestExecutor:
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@pytest.mark.anyio
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async def test_run_in_executor(self):
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"""Blocking function runs in thread pool without blocking event loop."""
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import time
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class BlockingActor(Actor):
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async def on_receive(self, message):
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# Simulate blocking I/O via thread pool
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result = await self.context.run_in_executor(time.sleep, 0.01)
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return "done"
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system = ActorSystem("test", executor_workers=2)
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ref = await system.spawn(BlockingActor, "blocker")
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result = await ref.ask("go", timeout=5.0)
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assert result == "done"
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await system.shutdown()
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@pytest.mark.anyio
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async def test_concurrent_blocking_calls(self):
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"""Multiple actors can run blocking I/O concurrently via shared pool."""
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import time
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class SlowActor(Actor):
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async def on_receive(self, message):
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await self.context.run_in_executor(time.sleep, 0.1)
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return "ok"
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system = ActorSystem("test", executor_workers=4)
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refs = [await system.spawn(SlowActor, f"s{i}") for i in range(4)]
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start = time.monotonic()
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results = await asyncio.gather(*[r.ask("go", timeout=5.0) for r in refs])
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elapsed = time.monotonic() - start
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assert all(r == "ok" for r in results)
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# 4 parallel × 0.1s should finish in ~0.1-0.2s, not 0.4s
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assert elapsed < 0.3
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await system.shutdown()
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class TestMiddleware:
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@pytest.mark.anyio
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async def test_middleware_intercepts_messages(self):
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mw = LogMiddleware()
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system = ActorSystem("test")
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ref = await system.spawn(EchoActor, "echo", middlewares=[mw])
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result = await ref.ask("hello")
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assert result == "hello"
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assert "before:hello" in mw.log
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assert "after:hello" in mw.log
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await system.shutdown()
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@pytest.mark.anyio
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async def test_middleware_lifecycle_hooks(self):
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mw = LogMiddleware()
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system = ActorSystem("test")
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ref = await system.spawn(EchoActor, "echo", middlewares=[mw])
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assert "started" in mw.log
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ref.stop()
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await asyncio.sleep(0.1)
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assert "stopped" in mw.log
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await system.shutdown()
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@pytest.mark.anyio
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async def test_middleware_chain_order(self):
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"""First middleware wraps outermost — sees original message."""
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mw1 = LogMiddleware()
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mw2 = TransformMiddleware()
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system = ActorSystem("test")
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# Chain: mw1(mw2(actor)). mw1 logs original, mw2 uppercases, actor echoes
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ref = await system.spawn(EchoActor, "echo", middlewares=[mw1, mw2])
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result = await ref.ask("hello")
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assert result == "HELLO" # TransformMiddleware uppercased
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assert "before:hello" in mw1.log # LogMiddleware saw original
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assert "after:HELLO" in mw1.log # LogMiddleware saw transformed result
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await system.shutdown()
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@pytest.mark.anyio
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async def test_middleware_with_tell(self):
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mw = LogMiddleware()
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system = ActorSystem("test")
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await system.spawn(CounterActor, "counter", middlewares=[mw])
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# tell goes through middleware too
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assert any("before:" in entry for entry in mw.log) is False
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await system.shutdown()
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