Spaces:
Sleeping
Sleeping
File size: 9,756 Bytes
2415446 a1bab2d 2415446 a1bab2d 2415446 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 | """Task execution for claims returned by messaging tree aggregates."""
from __future__ import annotations
import asyncio
import contextlib
from collections.abc import Awaitable, Callable
from dataclasses import dataclass
from loguru import logger
from ..safe_diagnostics import format_exception_for_log
from .runtime import MessageTree
from .transitions import CancellationReason, NodeClaim, QueueEntry
NodeProcessor = Callable[[NodeClaim], Awaitable[None]]
QueueUpdateCallback = Callable[[tuple[QueueEntry, ...]], Awaitable[None]]
NodeStartedCallback = Callable[[NodeClaim], Awaitable[None]]
ClaimFailureCallback = Callable[[NodeClaim], Awaitable[None]]
ClaimFinishedCallback = Callable[[MessageTree, NodeClaim], Awaitable[None]]
@dataclass(slots=True)
class _TaskSlot:
tree: MessageTree
claim: NodeClaim
task: asyncio.Task[None] | None = None
runner_started: bool = False
transitioned: bool = False
recovery_task: asyncio.Task[None] | None = None
cancellation_requested: bool = False
cancellation_reason: CancellationReason | None = None
@dataclass(frozen=True, slots=True)
class CancelledTask:
"""Task handle plus whether the node runner owns cancellation UI."""
task: asyncio.Task[None]
runner_started: bool
class TreeQueueProcessor:
"""Own asyncio tasks while MessageTree owns scheduling state."""
def __init__(
self,
node_processor: NodeProcessor,
*,
claim_failure_callback: ClaimFailureCallback,
claim_finished_callback: ClaimFinishedCallback,
queue_update_callback: QueueUpdateCallback | None = None,
node_started_callback: NodeStartedCallback | None = None,
log_messaging_error_details: bool = False,
) -> None:
self._node_processor = node_processor
self._claim_failure_callback = claim_failure_callback
self._claim_finished_callback = claim_finished_callback
self._queue_update_callback = queue_update_callback
self._node_started_callback = node_started_callback
self._log_messaging_error_details = log_messaging_error_details
self._tasks: dict[str, _TaskSlot] = {}
self._completion_failures: list[Exception] = []
self._idle = asyncio.Event()
self._idle.set()
@staticmethod
def _key(claim: NodeClaim) -> str:
return claim.claim_id
def launch(
self,
tree: MessageTree,
claim: NodeClaim,
*,
announce_started: bool = False,
queue: tuple[QueueEntry, ...] = (),
) -> None:
"""Attach a task synchronously before another coroutine can cancel it."""
key = self._key(claim)
if key in self._tasks:
raise RuntimeError(f"Claim {key} already has a task")
slot = _TaskSlot(tree=tree, claim=claim)
self._tasks[key] = slot
self._idle.clear()
ownership_ready = asyncio.Event()
claim_runner = self._run_claim(
slot,
ownership_ready=ownership_ready,
announce_started=announce_started,
queue=queue,
)
try:
task = asyncio.create_task(
claim_runner,
name=(f"messaging-claim-{claim.identity.root_id}-{claim.claim_id[:8]}"),
)
except BaseException:
claim_runner.close()
if self._tasks.get(key) is slot:
self._tasks.pop(key)
if not self._tasks:
self._idle.set()
raise
slot.task = task
task.add_done_callback(lambda _task, claim_key=key: self._task_done(claim_key))
ownership_ready.set()
def _task_done(self, key: str) -> None:
"""Recover a claim if its task was cancelled before entering its body."""
slot = self._tasks.get(key)
if slot is None or slot.transitioned or slot.recovery_task is not None:
return
slot.recovery_task = asyncio.create_task(
self._recover_unentered_task(slot),
name=f"messaging-claim-recovery-{key[:8]}",
)
async def _recover_unentered_task(self, slot: _TaskSlot) -> None:
task = slot.task
if task is not None:
with contextlib.suppress(asyncio.CancelledError, Exception):
await task
if not slot.transitioned:
await self._finish_and_continue(slot)
async def _notify_queue_updated(self, queue: tuple[QueueEntry, ...]) -> None:
if self._queue_update_callback is None:
return
try:
await self._queue_update_callback(queue)
except Exception as exc:
logger.warning(
"Queue update callback failed: {}",
format_exception_for_log(
exc,
log_full_message=self._log_messaging_error_details,
),
)
async def notify_queue_updated(self, queue: tuple[QueueEntry, ...]) -> None:
"""Publish a transition-owned queue snapshot."""
await self._notify_queue_updated(queue)
async def _notify_node_started(self, claim: NodeClaim) -> None:
if self._node_started_callback is None:
return
try:
await self._node_started_callback(claim)
except Exception as exc:
logger.warning(
"Node started callback failed: {}",
format_exception_for_log(
exc,
log_full_message=self._log_messaging_error_details,
),
)
async def _run_claim(
self,
slot: _TaskSlot,
*,
ownership_ready: asyncio.Event,
announce_started: bool,
queue: tuple[QueueEntry, ...],
) -> None:
await ownership_ready.wait()
claim = slot.claim
try:
if announce_started:
await self._notify_node_started(claim)
await self._notify_queue_updated(queue)
if slot.cancellation_requested:
if slot.cancellation_reason is None:
raise asyncio.CancelledError
raise asyncio.CancelledError(slot.cancellation_reason)
slot.runner_started = True
await self._node_processor(claim)
except asyncio.CancelledError:
logger.info("Task for node {} was cancelled", claim.node.node_id)
raise
except Exception as exc:
logger.error(
"Error processing node {}: {}",
claim.node.node_id,
format_exception_for_log(
exc,
log_full_message=self._log_messaging_error_details,
),
)
await self._claim_failure_callback(claim)
finally:
if not slot.transitioned:
await self._finish_and_continue(slot)
async def _finish_and_continue(self, slot: _TaskSlot) -> None:
current = asyncio.current_task()
if current is not None:
while current.cancelling():
current.uncancel()
try:
while True:
try:
await self._claim_finished_callback(slot.tree, slot.claim)
slot.transitioned = True
break
except asyncio.CancelledError:
if current is not None:
while current.cancelling():
current.uncancel()
continue
except Exception as exc:
self._completion_failures.append(exc)
logger.error(
"Claim completion callback failed for node {}: {}",
slot.claim.node.node_id,
format_exception_for_log(
exc,
log_full_message=self._log_messaging_error_details,
),
)
finally:
key = self._key(slot.claim)
if self._tasks.get(key) is slot:
self._tasks.pop(key)
if not self._tasks:
self._idle.set()
def cancel(
self,
claim: NodeClaim,
reason: CancellationReason | None,
) -> CancelledTask | None:
"""Cancel exactly the task bound to one aggregate claim."""
slot = self._tasks.get(self._key(claim))
if slot is None:
return None
slot.cancellation_requested = True
slot.cancellation_reason = reason
task = slot.task
if task is None or task.done():
return None
if reason is None:
task.cancel()
else:
task.cancel(reason)
if slot.runner_started:
return CancelledTask(task=task, runner_started=True)
if slot.recovery_task is None:
slot.recovery_task = asyncio.create_task(
self._recover_unentered_task(slot),
name=f"messaging-claim-recovery-{claim.claim_id[:8]}",
)
return CancelledTask(task=slot.recovery_task, runner_started=False)
def task_count(self) -> int:
"""Return the number of attached claims for observability."""
return len(self._tasks)
async def wait_idle(self) -> None:
"""Wait for every task and hand completion failures to the caller once."""
await self._idle.wait()
if not self._completion_failures:
return
failures = self._completion_failures
self._completion_failures = []
if len(failures) == 1:
raise failures[0]
raise ExceptionGroup("Messaging claim completion failures", failures)
__all__ = ["CancelledTask", "TreeQueueProcessor"]
|