mirror of
https://github.com/element-hq/synapse
synced 2024-10-01 09:52:42 +00:00
Implements a task scheduler for resumable potentially long running tasks
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9 changed files with 624 additions and 0 deletions
1
changelog.d/15891.feature
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1
changelog.d/15891.feature
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@ -0,0 +1 @@
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Implements a task scheduler for resumable potentially long running tasks.
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@ -91,6 +91,7 @@ from synapse.storage.databases.main.state import StateGroupWorkerStore
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from synapse.storage.databases.main.stats import StatsStore
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from synapse.storage.databases.main.stream import StreamWorkerStore
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from synapse.storage.databases.main.tags import TagsWorkerStore
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from synapse.storage.databases.main.task_scheduler import TaskSchedulerWorkerStore
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from synapse.storage.databases.main.transactions import TransactionWorkerStore
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from synapse.storage.databases.main.ui_auth import UIAuthWorkerStore
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from synapse.storage.databases.main.user_directory import UserDirectoryStore
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@ -144,6 +145,7 @@ class GenericWorkerStore(
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TransactionWorkerStore,
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LockStore,
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SessionStore,
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TaskSchedulerWorkerStore,
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):
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# Properties that multiple storage classes define. Tell mypy what the
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# expected type is.
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@ -141,6 +141,7 @@ from synapse.util.distributor import Distributor
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from synapse.util.macaroons import MacaroonGenerator
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from synapse.util.ratelimitutils import FederationRateLimiter
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from synapse.util.stringutils import random_string
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from synapse.util.task_scheduler import TaskScheduler
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logger = logging.getLogger(__name__)
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@ -359,6 +360,7 @@ class HomeServer(metaclass=abc.ABCMeta):
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"""
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for i in self.REQUIRED_ON_BACKGROUND_TASK_STARTUP:
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getattr(self, "get_" + i + "_handler")()
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self.get_task_scheduler()
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def get_reactor(self) -> ISynapseReactor:
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"""
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@ -912,3 +914,7 @@ class HomeServer(metaclass=abc.ABCMeta):
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def get_common_usage_metrics_manager(self) -> CommonUsageMetricsManager:
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"""Usage metrics shared between phone home stats and the prometheus exporter."""
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return CommonUsageMetricsManager(self)
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@cache_in_self
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def get_task_scheduler(self) -> TaskScheduler:
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return TaskScheduler(self)
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@ -70,6 +70,7 @@ from .state import StateStore
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from .stats import StatsStore
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from .stream import StreamWorkerStore
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from .tags import TagsStore
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from .task_scheduler import TaskSchedulerWorkerStore
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from .transactions import TransactionWorkerStore
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from .ui_auth import UIAuthStore
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from .user_directory import UserDirectoryStore
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@ -127,6 +128,7 @@ class DataStore(
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CacheInvalidationWorkerStore,
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LockStore,
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SessionStore,
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TaskSchedulerWorkerStore,
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):
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def __init__(
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self,
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173
synapse/storage/databases/main/task_scheduler.py
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173
synapse/storage/databases/main/task_scheduler.py
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# Copyright 2023 The Matrix.org Foundation C.I.C.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import json
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from typing import TYPE_CHECKING, Any, Dict, List, Optional
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from synapse.storage._base import SQLBaseStore
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from synapse.storage.database import DatabasePool, LoggingDatabaseConnection
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from synapse.types import JsonDict, JsonMapping, ScheduledTask, TaskStatus
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if TYPE_CHECKING:
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from synapse.server import HomeServer
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class TaskSchedulerWorkerStore(SQLBaseStore):
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def __init__(
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self,
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database: DatabasePool,
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db_conn: LoggingDatabaseConnection,
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hs: "HomeServer",
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):
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super().__init__(database, db_conn, hs)
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@staticmethod
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def _convert_row_to_task(row: Dict[str, Any]) -> ScheduledTask:
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row["status"] = TaskStatus(row["status"])
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if row["params"] is not None:
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row["params"] = json.loads(row["params"])
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if row["result"] is not None:
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row["result"] = json.loads(row["result"])
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return ScheduledTask(**row)
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async def get_scheduled_tasks(
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self, action: Optional[str] = None, resource_id: Optional[str] = None
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) -> List[ScheduledTask]:
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"""Get a list of scheduled tasks from the DB.
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If the parameters are `None` all the tasks are returned.
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Args:
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action: Limit the returned tasks to this specific action name
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resource_id: Limit the returned tasks to this specific resource id
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Returns: a list of `ScheduledTask`
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"""
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keyvalues = {}
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if action:
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keyvalues["action"] = action
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if resource_id:
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keyvalues["resource_id"] = resource_id
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rows = await self.db_pool.simple_select_list(
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table="scheduled_tasks",
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keyvalues=keyvalues,
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retcols=(
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"id",
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"action",
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"status",
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"timestamp",
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"resource_id",
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"params",
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"result",
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"error",
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),
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desc="get_scheduled_tasks",
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)
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return [TaskSchedulerWorkerStore._convert_row_to_task(row) for row in rows]
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async def upsert_scheduled_task(self, task: ScheduledTask) -> None:
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"""Upsert a specified `ScheduledTask` in the DB.
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Args:
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task: the `ScheduledTask` to upsert
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"""
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await self.db_pool.simple_upsert(
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"scheduled_tasks",
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{"id": task.id},
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{
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"action": task.action,
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"status": task.status,
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"timestamp": task.timestamp,
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"resource_id": task.resource_id,
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"params": None if task.params is None else json.dumps(task.params),
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"result": None if task.result is None else json.dumps(task.result),
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"error": task.error,
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},
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desc="upsert_scheduled_task",
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)
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async def update_scheduled_task(
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self,
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id: str,
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*,
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timestamp: Optional[int] = None,
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status: Optional[TaskStatus] = None,
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result: Optional[JsonMapping] = None,
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error: Optional[str] = None,
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) -> None:
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"""Update a scheduled task in the DB with some new value(s).
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Args:
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id: id of the `ScheduledTask` to update
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timestamp: new timestamp of the task
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status: new status of the task
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result: new result of the task
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error: new error of the task
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"""
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updatevalues: JsonDict = {}
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if timestamp is not None:
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updatevalues["timestamp"] = timestamp
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if status is not None:
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updatevalues["status"] = status
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if result is not None:
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updatevalues["result"] = json.dumps(result)
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if error is not None:
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updatevalues["error"] = error
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await self.db_pool.simple_update(
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"scheduled_tasks",
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{"id": id},
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updatevalues,
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desc="update_scheduled_task",
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)
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async def get_scheduled_task(self, id: str) -> Optional[ScheduledTask]:
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"""Get a specific `ScheduledTask` from its id.
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Args:
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id: the id of the task to retrieve
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Returns: the task if available, `None` otherwise
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"""
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row = await self.db_pool.simple_select_one(
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table="scheduled_tasks",
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keyvalues={"id": id},
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retcols=(
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"id",
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"action",
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"status",
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"timestamp",
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"resource_id",
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"params",
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"result",
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"error",
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),
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allow_none=True,
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desc="get_scheduled_task",
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)
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return TaskSchedulerWorkerStore._convert_row_to_task(row) if row else None
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async def delete_scheduled_task(self, id: str) -> None:
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"""Delete a specific task from its id.
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Args:
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id: the id of the task to delete
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"""
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await self.db_pool.simple_delete(
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"scheduled_tasks",
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keyvalues={"id": id},
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desc="delete_scheduled_task",
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)
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26
synapse/storage/schema/main/delta/79/03_scheduled_tasks.sql
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26
synapse/storage/schema/main/delta/79/03_scheduled_tasks.sql
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/* Copyright 2023 The Matrix.org Foundation C.I.C
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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-- cf ScheduledTask docstring for the meaning of the fields.
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CREATE TABLE IF NOT EXISTS scheduled_tasks(
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id text PRIMARY KEY,
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action text NOT NULL,
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status text NOT NULL,
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timestamp bigint NOT NULL,
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resource_id text,
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params text,
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result text,
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error text
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);
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@ -15,6 +15,7 @@
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import abc
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import re
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import string
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from enum import Enum
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from typing import (
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TYPE_CHECKING,
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AbstractSet,
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@ -979,3 +980,40 @@ class UserProfile(TypedDict):
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class RetentionPolicy:
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min_lifetime: Optional[int] = None
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max_lifetime: Optional[int] = None
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class TaskStatus(str, Enum):
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"""Status of a scheduled task"""
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# Task is scheduled but not active
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SCHEDULED = "scheduled"
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# Task is active and probably running, and if not
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# will be run on next scheduler loop run
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ACTIVE = "active"
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# Task has completed successfully
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COMPLETE = "complete"
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# Task is over and either returned a failed status, or had an exception
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FAILED = "failed"
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@attr.s(auto_attribs=True, frozen=True, slots=True)
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class ScheduledTask:
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"""Description of a scheduled task"""
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# id used to identify the task
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id: str
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# name of the action to be run by this task
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action: str
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# current status of this task
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status: TaskStatus
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# if the status is SCHEDULED then this represents when it should be launched,
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# otherwise it represents the last time this task got a change of state
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timestamp: int
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# Optionally bind a task to some resource id for easy retrieval
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resource_id: Optional[str]
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# Optional parameters that will be passed to the function ran by the task
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params: Optional[JsonMapping]
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# Optional result that can be updated by the running task
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result: Optional[JsonMapping]
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# Optional error that should be assigned a value when the status is FAILED
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error: Optional[str]
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244
synapse/util/task_scheduler.py
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244
synapse/util/task_scheduler.py
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# Copyright 2023 The Matrix.org Foundation C.I.C.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import logging
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from typing import TYPE_CHECKING, Awaitable, Callable, Dict, List, Optional, Set, Tuple
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from twisted.python.failure import Failure
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from synapse.metrics.background_process_metrics import run_as_background_process
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from synapse.types import JsonMapping, ScheduledTask, TaskStatus
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from synapse.util.stringutils import random_string
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if TYPE_CHECKING:
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from synapse.server import HomeServer
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logger = logging.getLogger(__name__)
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class TaskScheduler:
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# Precision of the scheduler, evaluation of tasks to run will only happen
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# every `SCHEDULE_INTERVAL_MS` ms
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SCHEDULE_INTERVAL_MS = 5 * 60 * 1000 # 5mn
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# Time before a complete or failed task is deleted from the DB
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KEEP_TASKS_FOR_MS = 7 * 24 * 60 * 60 * 1000 # 1 week
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def __init__(self, hs: "HomeServer"):
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self.store = hs.get_datastores().main
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self.clock = hs.get_clock()
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self.running_tasks: Set[str] = set()
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self.actions: Dict[
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str,
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Callable[
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[ScheduledTask, bool],
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Awaitable[Tuple[TaskStatus, Optional[JsonMapping], Optional[str]]],
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],
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] = {}
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self.run_background_tasks = hs.config.worker.run_background_tasks
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if self.run_background_tasks:
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self.clock.looping_call(
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run_as_background_process,
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TaskScheduler.SCHEDULE_INTERVAL_MS,
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"scheduled_tasks_loop",
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self._scheduled_tasks_loop,
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)
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def register_action(
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self,
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function: Callable[
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[ScheduledTask, bool],
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Awaitable[Tuple[TaskStatus, Optional[JsonMapping], Optional[str]]],
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],
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action_name: str,
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) -> None:
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"""Register a function to be executed when an action is scheduled with
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the specified action name.
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Actions need to be registered as early as possible so that a resumed action
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can find its matching function. It's usually better to NOT do that right before
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calling `schedule_task` but rather in an `__init__` method.
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Args:
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function: The function to be executed for this action. The parameters
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passed to the function when launched are the `ScheduledTask` being run,
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and a `first_launch` boolean to signal if it's a resumed task or the first
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launch of it. The function should return a tuple of new `status`, `result`
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and `error` as specified in `ScheduledTask`.
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action_name: The name of the action to be associated with the function
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"""
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self.actions[action_name] = function
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async def schedule_task(
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self,
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action: str,
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*,
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resource_id: Optional[str] = None,
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timestamp: Optional[int] = None,
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params: Optional[JsonMapping] = None,
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) -> str:
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"""Schedule a new potentially resumable task. A function matching the specified
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`action` should have been previously registered with `register_action`.
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Args:
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action: the name of a previously registered action
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resource_id: a task can be associated with a resource id to facilitate
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getting all tasks associated with a specific resource
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timestamp: if `None`, the task will be launched immediately, otherwise it
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will be launch after the `timestamp` value. Note that this scheduler
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is not meant to be precise, and the scheduling could be delayed if
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too many tasks are already running
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params: a set of parameters that can be easily accessed from inside the
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executed function
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Returns: the id of the scheduled task
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"""
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if action not in self.actions:
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raise Exception(
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f"No function associated with the action {action} of the scheduled task"
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)
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launch_now = False
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if timestamp is None or timestamp < self.clock.time_msec():
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timestamp = self.clock.time_msec()
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launch_now = True
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task = ScheduledTask(
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random_string(16),
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action,
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TaskStatus.SCHEDULED,
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timestamp,
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resource_id,
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params,
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None,
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None,
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)
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await self.store.upsert_scheduled_task(task)
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if launch_now and self.run_background_tasks:
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await self._launch_task(task, True)
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return task.id
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async def update_task(
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self,
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id: str,
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*,
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status: Optional[TaskStatus] = None,
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result: Optional[JsonMapping] = None,
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error: Optional[str] = None,
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) -> None:
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"""Update some task associated values.
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This is used internally, and also exposed publically so it can be used inside task functions.
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This allows to store in DB the progress of a task so it can be resumed properly after a restart of synapse.
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Args:
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id: the id of the task to update
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status: the new `TaskStatus` of the task
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result: the new result of the task
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error: the new error of the task
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"""
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await self.store.update_scheduled_task(
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id,
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timestamp=self.clock.time_msec(),
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status=status,
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result=result,
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error=error,
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)
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async def get_task(self, id: str) -> Optional[ScheduledTask]:
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"""Get a specific task description by id.
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Args:
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id: the id of the task to retrieve
|
||||
|
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Returns: the task description or `None` if it doesn't exist
|
||||
or it has already been cleaned
|
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"""
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return await self.store.get_scheduled_task(id)
|
||||
|
||||
async def get_tasks(
|
||||
self, action: str, resource_id: Optional[str]
|
||||
) -> List[ScheduledTask]:
|
||||
"""Get a list of tasks associated with an action name, and
|
||||
optionally with a resource id.
|
||||
|
||||
Args:
|
||||
action: the action name of the tasks to retrieve
|
||||
resource_id: if `None`, returns all associated tasks for
|
||||
the specified action name, regardless of the resource id
|
||||
|
||||
Returns: a list of `ScheduledTask`
|
||||
"""
|
||||
return await self.store.get_scheduled_tasks(action, resource_id)
|
||||
|
||||
async def _scheduled_tasks_loop(self) -> None:
|
||||
"""Main loop taking care of launching the scheduled tasks when needed."""
|
||||
for task in await self.store.get_scheduled_tasks():
|
||||
if task.id not in self.running_tasks:
|
||||
if (
|
||||
task.status == TaskStatus.SCHEDULED
|
||||
and task.timestamp < self.clock.time_msec()
|
||||
):
|
||||
await self._launch_task(task, True)
|
||||
elif task.status == TaskStatus.ACTIVE:
|
||||
await self._launch_task(task, False)
|
||||
elif (
|
||||
task.status == TaskStatus.COMPLETE
|
||||
or task.status == TaskStatus.FAILED
|
||||
) and self.clock.time_msec() > task.timestamp + TaskScheduler.KEEP_TASKS_FOR_MS:
|
||||
await self.store.delete_scheduled_task(task.id)
|
||||
|
||||
async def _launch_task(self, task: ScheduledTask, first_launch: bool) -> None:
|
||||
"""Launch a scheduled task now.
|
||||
|
||||
Args:
|
||||
task: the task to launch
|
||||
first_launch: `True` if it's the first time is launched, `False` otherwise
|
||||
"""
|
||||
if task.action not in self.actions:
|
||||
raise Exception(
|
||||
f"No function associated with the action {task.action} of the scheduled task"
|
||||
)
|
||||
|
||||
function = self.actions[task.action]
|
||||
|
||||
async def wrapper() -> None:
|
||||
try:
|
||||
(status, result, error) = await function(task, first_launch)
|
||||
except Exception:
|
||||
f = Failure()
|
||||
logger.error(
|
||||
f"scheduled task {task.id} failed",
|
||||
exc_info=(f.type, f.value, f.getTracebackObject()),
|
||||
)
|
||||
status = TaskStatus.FAILED
|
||||
result = None
|
||||
error = f.getErrorMessage()
|
||||
|
||||
await self.update_task(
|
||||
task.id,
|
||||
status=status,
|
||||
result=result,
|
||||
error=error,
|
||||
)
|
||||
self.running_tasks.remove(task.id)
|
||||
|
||||
await self.update_task(task.id, status=TaskStatus.ACTIVE)
|
||||
self.running_tasks.add(task.id)
|
||||
description = task.action
|
||||
if task.resource_id:
|
||||
description += f"-{task.resource_id}"
|
||||
run_as_background_process(description, wrapper)
|
132
tests/util/test_task_scheduler.py
Normal file
132
tests/util/test_task_scheduler.py
Normal file
|
@ -0,0 +1,132 @@
|
|||
# Copyright 2023 The Matrix.org Foundation C.I.C.
|
||||
#
|
||||
# Licensed under the Apache License, Version 2.0 (the "License");
|
||||
# you may not use this file except in compliance with the License.
|
||||
# You may obtain a copy of the License at
|
||||
#
|
||||
# http://www.apache.org/licenses/LICENSE-2.0
|
||||
#
|
||||
# Unless required by applicable law or agreed to in writing, software
|
||||
# distributed under the License is distributed on an "AS IS" BASIS,
|
||||
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
# See the License for the specific language governing permissions and
|
||||
# limitations under the License.
|
||||
|
||||
from typing import Optional, Tuple
|
||||
|
||||
from twisted.internet.task import deferLater
|
||||
from twisted.test.proto_helpers import MemoryReactor
|
||||
|
||||
from synapse.server import HomeServer
|
||||
from synapse.types import JsonMapping, ScheduledTask, TaskStatus
|
||||
from synapse.util import Clock
|
||||
from synapse.util.task_scheduler import TaskScheduler
|
||||
|
||||
from tests import unittest
|
||||
|
||||
|
||||
class TestTaskScheduler(unittest.HomeserverTestCase):
|
||||
def prepare(self, reactor: MemoryReactor, clock: Clock, hs: HomeServer) -> None:
|
||||
self.task_scheduler = hs.get_task_scheduler()
|
||||
self.task_scheduler.register_action(self._test_task, "_test_task")
|
||||
self.task_scheduler.register_action(self._raising_task, "_raising_task")
|
||||
self.task_scheduler.register_action(self._resumable_task, "_resumable_task")
|
||||
|
||||
async def _test_task(
|
||||
self, task: ScheduledTask, first_launch: bool
|
||||
) -> Tuple[TaskStatus, Optional[JsonMapping], Optional[str]]:
|
||||
# This test task will copy the parameters to the result
|
||||
result = None
|
||||
if task.params:
|
||||
result = task.params
|
||||
return (TaskStatus.COMPLETE, result, None)
|
||||
|
||||
def test_schedule_task(self) -> None:
|
||||
"""Schedule a task in the future with some parameters to be copied as a result and check it executed correctly.
|
||||
Also check that it get removed after `KEEP_TASKS_FOR_MS`."""
|
||||
timestamp = self.clock.time_msec() + 2 * 60 * 1000
|
||||
task_id = self.get_success(
|
||||
self.task_scheduler.schedule_task(
|
||||
"_test_task",
|
||||
timestamp=timestamp,
|
||||
params={"val": 1},
|
||||
)
|
||||
)
|
||||
|
||||
task = self.get_success(self.task_scheduler.get_task(task_id))
|
||||
assert task is not None
|
||||
self.assertEqual(task.status, TaskStatus.SCHEDULED)
|
||||
self.assertIsNone(task.result)
|
||||
|
||||
# The timestamp being 2mn after now the task should been executed
|
||||
# after the first scheduling loop is run
|
||||
self.reactor.advance((TaskScheduler.SCHEDULE_INTERVAL_MS / 1000) + 1)
|
||||
|
||||
task = self.get_success(self.task_scheduler.get_task(task_id))
|
||||
assert task is not None
|
||||
self.assertEqual(task.status, TaskStatus.COMPLETE)
|
||||
assert task.result is not None
|
||||
# The passed parameter should have been copied to the result
|
||||
self.assertTrue(task.result.get("val") == 1)
|
||||
|
||||
# Let's wait for the complete task to be deleted and hence unavailable
|
||||
self.reactor.advance((TaskScheduler.KEEP_TASKS_FOR_MS / 1000) + 1)
|
||||
|
||||
task = self.get_success(self.task_scheduler.get_task(task_id))
|
||||
self.assertIsNone(task)
|
||||
|
||||
def test_schedule_task_now(self) -> None:
|
||||
"""Schedule a task now and check it runs fine to completion."""
|
||||
task_id = self.get_success(
|
||||
self.task_scheduler.schedule_task("_test_task", params={"val": 1})
|
||||
)
|
||||
|
||||
task = self.get_success(self.task_scheduler.get_task(task_id))
|
||||
assert task is not None
|
||||
self.assertEqual(task.status, TaskStatus.COMPLETE)
|
||||
assert task.result is not None
|
||||
self.assertTrue(task.result.get("val") == 1)
|
||||
|
||||
async def _raising_task(
|
||||
self, task: ScheduledTask, first_launch: bool
|
||||
) -> Tuple[TaskStatus, Optional[JsonMapping], Optional[str]]:
|
||||
raise Exception("raising")
|
||||
|
||||
def test_schedule_raising_task_now(self) -> None:
|
||||
"""Schedule a task raising an exception and check it runs to failure and report exception content."""
|
||||
task_id = self.get_success(self.task_scheduler.schedule_task("_raising_task"))
|
||||
|
||||
task = self.get_success(self.task_scheduler.get_task(task_id))
|
||||
assert task is not None
|
||||
self.assertEqual(task.status, TaskStatus.FAILED)
|
||||
self.assertEqual(task.error, "raising")
|
||||
|
||||
async def _resumable_task(
|
||||
self, task: ScheduledTask, first_launch: bool
|
||||
) -> Tuple[TaskStatus, Optional[JsonMapping], Optional[str]]:
|
||||
if task.result and "in_progress" in task.result:
|
||||
return TaskStatus.COMPLETE, {"success": True}, None
|
||||
else:
|
||||
await self.task_scheduler.update_task(task.id, result={"in_progress": True})
|
||||
# Await forever to simulate an aborted task because of a restart
|
||||
await deferLater(self.reactor, 2**16, None)
|
||||
# This should never been called
|
||||
return TaskStatus.ACTIVE, None, None
|
||||
|
||||
def test_schedule_resumable_task_now(self) -> None:
|
||||
"""Schedule a resumable task and check that it gets properly resumed and complete after simulating a synapse restart."""
|
||||
task_id = self.get_success(self.task_scheduler.schedule_task("_resumable_task"))
|
||||
|
||||
task = self.get_success(self.task_scheduler.get_task(task_id))
|
||||
assert task is not None
|
||||
self.assertEqual(task.status, TaskStatus.ACTIVE)
|
||||
|
||||
# Simulate a synapse restart by emptying the list of running tasks
|
||||
self.task_scheduler.running_tasks = set()
|
||||
self.reactor.advance((TaskScheduler.SCHEDULE_INTERVAL_MS / 1000) + 1)
|
||||
|
||||
task = self.get_success(self.task_scheduler.get_task(task_id))
|
||||
assert task is not None
|
||||
self.assertEqual(task.status, TaskStatus.COMPLETE)
|
||||
assert task.result is not None
|
||||
self.assertTrue(task.result.get("success"))
|
Loading…
Reference in a new issue