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app/storage/mongo/tasks.py

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+import asyncio
+import bson
+import datetime
+import pydantic
+import typing
+
+from app.storage.mongo import database
+from app.utils import time
+from bson import codec_options
+
+
+collection = database.get_collection("tasks", codec_options=codec_options.CodecOptions(tz_aware=True))
+
+
+class Task(pydantic.BaseModel):
+    queue: str
+    payload: dict
+    put_at: pydantic.AwareDatetime
+    available_from: pydantic.AwareDatetime
+    seconds_to_execute: int
+    _id: bson.ObjectId|None = None
+    taken_at: pydantic.AwareDatetime|None = None
+    attempts: int = 0
+
+
+async def add_task(task: Task) -> str:
+    result = await collection.insert_one(task.model_dump())
+    return result.inserted_id
+
+
+async def take_task(queue: str) -> typing.Optional[Task]:
+    now = time.now()
+    async for raw_task in collection.find({'queue': queue, 'available_from': {'$lte': now}}):
+        task = Task.model_validate(raw_task)
+        task._id = raw_task['_id']
+        if not task.taken_at or (task.taken_at + datetime.timedelta(seconds=task.seconds_to_execute)) < now:
+            await collection.update_one({'_id': task._id}, {'$set': {'taken_at': now, 'attempts': task.attempts + 1}})
+            return task
+    return None
+
+
+async def finish_task(id: bson.ObjectId) -> bool:
+    result = await collection.delete_one({'_id': id})
+    return result