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1ebb69b dc2e1e1 1ebb69b dc2e1e1 | 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 | """
Nancy — Task Queue.
Manages the lifecycle of tasks using ``asyncio.Queue`` for the pending
work queue and a dict of ``TaskHandle`` objects for in-flight coordination.
The queue bridges two sides:
- **API side** (producer): creates a task, enqueues it, waits for chunks.
- **Extension side** (consumer): dequeues tasks via SSE, pushes response chunks.
"""
from __future__ import annotations
import asyncio
import logging
import time
from typing import AsyncIterator
from config import settings
from models.task import Task, TaskHandle, TaskStatus
logger = logging.getLogger("nancy.queue")
class TaskQueue:
"""
Central task queue and handle registry.
This is a singleton that coordinates between the API router
(which creates tasks) and the extension router (which fulfills them).
Attributes:
_pending: asyncio.Queue of Task objects waiting for an extension.
_handles: dict mapping ``task_id`` → ``TaskHandle`` for in-flight tasks.
_history: bounded list of recently completed task summaries.
"""
def __init__(self, max_size: int | None = None) -> None:
self._max_size = max_size or settings.task_queue_max_size
self._pending: asyncio.Queue[Task] = asyncio.Queue(maxsize=self._max_size)
self._handles: dict[str, TaskHandle] = {}
self._history: list[dict] = []
self._max_history = 100
# Event fired whenever a new task is enqueued — used to wake the
# extension SSE stream.
self._new_task_event = asyncio.Event()
# ── API-side operations ───────────────────────────────────────────
async def submit_task(self, task: Task) -> TaskHandle:
"""
Submit a new task and return its handle.
The handle's ``chunk_queue`` and ``done_event`` are used by the
API router to stream chunks back to the caller.
Raises:
asyncio.QueueFull: If the pending queue is at capacity.
"""
handle = TaskHandle(task)
self._handles[task.task_id] = handle
try:
self._pending.put_nowait(task)
except asyncio.QueueFull:
# Clean up the handle
self._handles.pop(task.task_id, None)
logger.error("Task queue full — rejecting task %s", task.task_id)
raise
self._new_task_event.set()
logger.info(
"Task %s submitted (provider=%s, model=%s, queue_size=%d)",
task.task_id,
task.provider,
task.model,
self._pending.qsize(),
)
return handle
def get_handle(self, task_id: str) -> TaskHandle | None:
"""Retrieve a handle by task ID, or None if not found."""
return self._handles.get(task_id)
async def wait_for_completion(
self,
handle: TaskHandle,
timeout: float | None = None,
) -> None:
"""
Block until the task is done or timeout expires.
This is used for *non-streaming* requests that need the full response.
Raises:
asyncio.TimeoutError: If the task does not complete in time.
"""
timeout = timeout or settings.task_timeout_seconds
try:
await asyncio.wait_for(handle.done_event.wait(), timeout=timeout)
except asyncio.TimeoutError:
handle.task.status = TaskStatus.TIMED_OUT
handle.task.error = f"Task timed out after {timeout}s"
handle.finish(error=handle.task.error)
raise
async def stream_chunks(
self,
handle: TaskHandle,
timeout: float | None = None,
) -> AsyncIterator[str]:
"""
Async generator that yields text chunks from the extension.
Yields chunks until a ``None`` sentinel is received (end of stream)
or the timeout expires.
"""
timeout = timeout or settings.task_timeout_seconds
deadline = time.time() + timeout
while True:
remaining = deadline - time.time()
if remaining <= 0:
handle.task.status = TaskStatus.TIMED_OUT
handle.task.error = "Streaming timed out"
logger.warning("Task %s stream timed out", handle.task_id)
break
try:
chunk = await asyncio.wait_for(
handle.chunk_queue.get(),
timeout=min(remaining, 30.0),
)
except asyncio.TimeoutError:
# Check if there's still time left
if time.time() >= deadline:
handle.task.status = TaskStatus.TIMED_OUT
handle.task.error = "Streaming timed out"
logger.warning("Task %s stream timed out", handle.task_id)
break
continue
if chunk is None:
# End-of-stream sentinel
break
yield chunk
# ── Extension-side operations ─────────────────────────────────────
async def dequeue_task(self, timeout: float = 30.0) -> Task | None:
"""
Dequeue the next pending task.
Returns ``None`` if no task is available within ``timeout`` seconds.
Used by the extension SSE stream.
"""
try:
task = await asyncio.wait_for(self._pending.get(), timeout=timeout)
task.status = TaskStatus.ASSIGNED
task.assigned_at = time.time()
logger.info("Task %s dequeued (provider=%s)", task.task_id, task.provider)
return task
except asyncio.TimeoutError:
return None
def push_chunk(self, task_id: str, chunk: str) -> bool:
"""
Push a response chunk for a task. Returns False if task not found.
"""
handle = self._handles.get(task_id)
if not handle:
logger.warning("Chunk received for unknown task %s", task_id)
return False
if handle.task.status == TaskStatus.ASSIGNED:
handle.task.status = TaskStatus.STREAMING
handle.push_chunk(chunk)
return True
def complete_task(self, task_id: str, error: str | None = None) -> bool:
"""
Mark a task as complete. Returns False if task not found.
"""
handle = self._handles.get(task_id)
if not handle:
logger.warning("Completion signal for unknown task %s", task_id)
return False
handle.finish(error=error)
# Archive to history
self._history.append(handle.task.to_status_dict())
if len(self._history) > self._max_history:
self._history = self._history[-self._max_history:]
logger.info(
"Task %s completed (status=%s, error=%s)",
task_id,
handle.task.status.value,
error,
)
return True
def cleanup_task(self, task_id: str) -> None:
"""Remove a task handle from the registry."""
self._handles.pop(task_id, None)
# ── Observability ─────────────────────────────────────────────────
@property
def pending_count(self) -> int:
"""Number of tasks waiting in the queue."""
return self._pending.qsize()
@property
def active_count(self) -> int:
"""Number of in-flight task handles."""
return len(self._handles)
@property
def new_task_event(self) -> asyncio.Event:
"""Event that fires when a new task is enqueued."""
return self._new_task_event
def get_status(self) -> dict:
"""Return queue status for health endpoints."""
return {
"pending": self.pending_count,
"active": self.active_count,
"max_size": self._max_size,
"recent_history": len(self._history),
}
def get_active_tasks(self) -> list[dict]:
"""Return status dicts for all active tasks."""
return [h.task.to_status_dict() for h in self._handles.values()]
def get_history(self, limit: int = 20) -> list[dict]:
"""Return recent task history."""
return self._history[-limit:]
def is_extension_active(self) -> bool:
"""Check if there is at least one active extension connection."""
try:
from routers.extension import active_extensions
now = time.time()
return any((now - last_seen) < 45.0 for last_seen in active_extensions.values())
except Exception:
return False
# Module-level singleton
task_queue = TaskQueue()
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