import calendar import logging import time import traceback from datetime import datetime, timedelta, timezone from typing import TYPE_CHECKING, Any, List, Optional, Type, Union from rq.serializers import resolve_serializer from .timeouts import BaseDeathPenalty, UnixSignalDeathPenalty if TYPE_CHECKING: from redis import Redis from redis.client import Pipeline from .connections import resolve_connection from .defaults import DEFAULT_FAILURE_TTL from .exceptions import AbandonedJobError, InvalidJobOperation, NoSuchJobError from .job import Job, JobStatus from .queue import Queue from .utils import as_text, backend_class, current_timestamp logger = logging.getLogger("rq.registry") class BaseRegistry: """ Base implementation of a job registry, implemented in Redis sorted set. Each job is stored as a key in the registry, scored by expiration time (unix timestamp). """ job_class = Job death_penalty_class = UnixSignalDeathPenalty key_template = 'rq:registry:{0}' def __init__( self, name: str = 'default', connection: Optional['Redis'] = None, job_class: Optional[Type['Job']] = None, queue: Optional['Queue'] = None, serializer: Any = None, death_penalty_class: Optional[Type[BaseDeathPenalty]] = None, ): if queue: self.name = queue.name self.connection = queue.connection or resolve_connection() self.serializer = queue.serializer else: self.name = name self.connection = connection or resolve_connection() self.serializer = resolve_serializer(serializer) self.key = self.key_template.format(self.name) self.job_class = backend_class(self, 'job_class', override=job_class) self.death_penalty_class = backend_class(self, 'death_penalty_class', override=death_penalty_class) def __len__(self): """Returns the number of jobs in this registry""" return self.count def __eq__(self, other): return ( self.name == other.name and self.connection.connection_pool.connection_kwargs == other.connection.connection_pool.connection_kwargs ) def __contains__(self, item: Union[str, 'Job']) -> bool: """ Returns a boolean indicating registry contains the given job instance or job id. Args: item (Union[str, Job]): A Job ID or a Job. """ job_id = item if isinstance(item, self.job_class): job_id = item.id return self.connection.zscore(self.key, job_id) is not None @property def count(self) -> int: """Returns the number of jobs in this registry Returns: int: _description_ """ self.cleanup() return self.connection.zcard(self.key) def add(self, job: 'Job', ttl=0, pipeline: Optional['Pipeline'] = None, xx: bool = False) -> int: """Adds a job to a registry with expiry time of now + ttl, unless it's -1 which is set to +inf Args: job (Job): The Job to add ttl (int, optional): The time to live. Defaults to 0. pipeline (Optional[Pipeline], optional): The Redis Pipeline. Defaults to None. xx (bool, optional): .... Defaults to False. Returns: result (int): The ZADD command result """ score = ttl if ttl < 0 else current_timestamp() + ttl if score == -1: score = '+inf' if pipeline is not None: return pipeline.zadd(self.key, {job.id: score}, xx=xx) return self.connection.zadd(self.key, {job.id: score}, xx=xx) def remove(self, job: 'Job', pipeline: Optional['Pipeline'] = None, delete_job: bool = False): """Removes job from registry and deletes it if `delete_job == True` Args: job (Job): The Job to remove from the registry pipeline (Optional[Pipeline], optional): The Redis Pipeline. Defaults to None. delete_job (bool, optional): If should delete the job.. Defaults to False. """ connection = pipeline if pipeline is not None else self.connection job_id = job.id if isinstance(job, self.job_class) else job result = connection.zrem(self.key, job_id) if delete_job: if isinstance(job, self.job_class): job_instance = job else: job_instance = Job.fetch(job_id, connection=connection, serializer=self.serializer) job_instance.delete() return result def get_expired_job_ids(self, timestamp: Optional[float] = None): """Returns job ids whose score are less than current timestamp. Returns ids for jobs with an expiry time earlier than timestamp, specified as seconds since the Unix epoch. timestamp defaults to call time if unspecified. """ score = timestamp if timestamp is not None else current_timestamp() expired_jobs = self.connection.zrangebyscore(self.key, 0, score) return [as_text(job_id) for job_id in expired_jobs] def get_job_ids(self, start: int = 0, end: int = -1): """Returns list of all job ids. Args: start (int, optional): _description_. Defaults to 0. end (int, optional): _description_. Defaults to -1. Returns: _type_: _description_ """ self.cleanup() return [as_text(job_id) for job_id in self.connection.zrange(self.key, start, end)] def get_queue(self): """Returns Queue object associated with this registry.""" return Queue(self.name, connection=self.connection, serializer=self.serializer) def get_expiration_time(self, job: 'Job') -> datetime: """Returns job's expiration time. Args: job (Job): The Job to get the expiration """ score = self.connection.zscore(self.key, job.id) return datetime.utcfromtimestamp(score) def requeue(self, job_or_id: Union['Job', str], at_front: bool = False) -> 'Job': """Requeues the job with the given job ID. Args: job_or_id (Union['Job', str]): The Job or the Job ID at_front (bool, optional): If the Job should be put at the front of the queue. Defaults to False. Raises: InvalidJobOperation: If nothing is returned from the `ZREM` operation. Returns: Job: The Requeued Job. """ if isinstance(job_or_id, self.job_class): job = job_or_id serializer = job.serializer else: serializer = self.serializer job = self.job_class.fetch(job_or_id, connection=self.connection, serializer=serializer) result = self.connection.zrem(self.key, job.id) if not result: raise InvalidJobOperation with self.connection.pipeline() as pipeline: queue = Queue(job.origin, connection=self.connection, job_class=self.job_class, serializer=serializer) job.started_at = None job.ended_at = None job._exc_info = '' job.save() job = queue._enqueue_job(job, pipeline=pipeline, at_front=at_front) pipeline.execute() return job class StartedJobRegistry(BaseRegistry): """ Registry of currently executing jobs. Each queue maintains a StartedJobRegistry. Jobs in this registry are ones that are currently being executed. Jobs are added to registry right before they are executed and removed right after completion (success or failure). """ key_template = 'rq:wip:{0}' def cleanup(self, timestamp: Optional[float] = None): """Remove abandoned jobs from registry and add them to FailedJobRegistry. Removes jobs with an expiry time earlier than timestamp, specified as seconds since the Unix epoch. timestamp defaults to call time if unspecified. Removed jobs are added to the global failed job queue. Args: timestamp (datetime): The datetime to use as the limit. """ score = timestamp if timestamp is not None else current_timestamp() job_ids = self.get_expired_job_ids(score) if job_ids: failed_job_registry = FailedJobRegistry(self.name, self.connection, serializer=self.serializer) with self.connection.pipeline() as pipeline: for job_id in job_ids: try: job = self.job_class.fetch(job_id, connection=self.connection, serializer=self.serializer) except NoSuchJobError: continue job.execute_failure_callback( self.death_penalty_class, AbandonedJobError, AbandonedJobError(), traceback.extract_stack() ) retry = job.retries_left and job.retries_left > 0 if retry: queue = self.get_queue() job.retry(queue, pipeline) else: exc_string = f"due to {AbandonedJobError.__name__}" logger.warning( f'{self.__class__.__name__} cleanup: Moving job to {FailedJobRegistry.__name__} ' f'({exc_string})' ) job.set_status(JobStatus.FAILED) job._exc_info = f"Moved to {FailedJobRegistry.__name__}, {exc_string}, at {datetime.now()}" job.save(pipeline=pipeline, include_meta=False) job.cleanup(ttl=-1, pipeline=pipeline) failed_job_registry.add(job, job.failure_ttl) pipeline.zremrangebyscore(self.key, 0, score) pipeline.execute() return job_ids class FinishedJobRegistry(BaseRegistry): """ Registry of jobs that have been completed. Jobs are added to this registry after they have successfully completed for monitoring purposes. """ key_template = 'rq:finished:{0}' def cleanup(self, timestamp: Optional[float] = None): """Remove expired jobs from registry. Removes jobs with an expiry time earlier than timestamp, specified as seconds since the Unix epoch. timestamp defaults to call time if unspecified. """ score = timestamp if timestamp is not None else current_timestamp() self.connection.zremrangebyscore(self.key, 0, score) class FailedJobRegistry(BaseRegistry): """ Registry of containing failed jobs. """ key_template = 'rq:failed:{0}' def cleanup(self, timestamp: Optional[float] = None): """Remove expired jobs from registry. Removes jobs with an expiry time earlier than timestamp, specified as seconds since the Unix epoch. timestamp defaults to call time if unspecified. """ score = timestamp if timestamp is not None else current_timestamp() self.connection.zremrangebyscore(self.key, 0, score) def add( self, job: 'Job', ttl=None, exc_string: str = '', pipeline: Optional['Pipeline'] = None, _save_exc_to_job: bool = False, ): """ Adds a job to a registry with expiry time of now + ttl. `ttl` defaults to DEFAULT_FAILURE_TTL if not specified. """ if ttl is None: ttl = DEFAULT_FAILURE_TTL score = ttl if ttl < 0 else current_timestamp() + ttl if pipeline: p = pipeline else: p = self.connection.pipeline() job._exc_info = exc_string job.save(pipeline=p, include_meta=False, include_result=_save_exc_to_job) job.cleanup(ttl=ttl, pipeline=p) p.zadd(self.key, {job.id: score}) if not pipeline: p.execute() class DeferredJobRegistry(BaseRegistry): """ Registry of deferred jobs (waiting for another job to finish). """ key_template = 'rq:deferred:{0}' def cleanup(self): """This method is only here to prevent errors because this method is automatically called by `count()` and `get_job_ids()` methods implemented in BaseRegistry.""" pass class ScheduledJobRegistry(BaseRegistry): """ Registry of scheduled jobs. """ key_template = 'rq:scheduled:{0}' def __init__(self, *args, **kwargs): super().__init__(*args, **kwargs) # The underlying implementation of get_jobs_to_enqueue() is # the same as get_expired_job_ids, but get_expired_job_ids() doesn't # make sense in this context self.get_jobs_to_enqueue = self.get_expired_job_ids def schedule(self, job: 'Job', scheduled_datetime, pipeline: Optional['Pipeline'] = None): """ Adds job to registry, scored by its execution time (in UTC). If datetime has no tzinfo, it will assume localtimezone. """ # If datetime has no timezone, assume server's local timezone if not scheduled_datetime.tzinfo: tz = timezone(timedelta(seconds=-(time.timezone if time.daylight == 0 else time.altzone))) scheduled_datetime = scheduled_datetime.replace(tzinfo=tz) timestamp = calendar.timegm(scheduled_datetime.utctimetuple()) return self.connection.zadd(self.key, {job.id: timestamp}) def cleanup(self): """This method is only here to prevent errors because this method is automatically called by `count()` and `get_job_ids()` methods implemented in BaseRegistry.""" pass def remove_jobs(self, timestamp: Optional[datetime] = None, pipeline: Optional['Pipeline'] = None): """Remove jobs whose timestamp is in the past from registry. Args: timestamp (Optional[datetime], optional): The timestamp. Defaults to None. pipeline (Optional[Pipeline], optional): The Redis pipeline. Defaults to None. """ connection = pipeline if pipeline is not None else self.connection score = timestamp if timestamp is not None else current_timestamp() return connection.zremrangebyscore(self.key, 0, score) def get_jobs_to_schedule(self, timestamp: Optional[datetime] = None, chunk_size: int = 1000) -> List[str]: """Get's a list of job IDs that should be scheduled. Args: timestamp (Optional[datetime], optional): _description_. Defaults to None. chunk_size (int, optional): _description_. Defaults to 1000. Returns: jobs (List[str]): A list of Job ids """ score = timestamp if timestamp is not None else current_timestamp() jobs_to_schedule = self.connection.zrangebyscore(self.key, 0, score, start=0, num=chunk_size) return [as_text(job_id) for job_id in jobs_to_schedule] def get_scheduled_time(self, job_or_id: Union['Job', str]) -> datetime: """Returns datetime (UTC) at which job is scheduled to be enqueued Args: job_or_id (Union[Job, str]): The Job instance or Job ID Raises: NoSuchJobError: If the job was not found Returns: datetime (datetime): The scheduled time as datetime object """ if isinstance(job_or_id, self.job_class): job_id = job_or_id.id else: job_id = job_or_id score = self.connection.zscore(self.key, job_id) if not score: raise NoSuchJobError return datetime.fromtimestamp(score, tz=timezone.utc) class CanceledJobRegistry(BaseRegistry): key_template = 'rq:canceled:{0}' def get_expired_job_ids(self, timestamp: Optional[datetime] = None): raise NotImplementedError def cleanup(self): """This method is only here to prevent errors because this method is automatically called by `count()` and `get_job_ids()` methods implemented in BaseRegistry.""" pass def clean_registries(queue: 'Queue'): """Cleans StartedJobRegistry, FinishedJobRegistry and FailedJobRegistry of a queue. Args: queue (Queue): The queue to clean """ registry = FinishedJobRegistry( name=queue.name, connection=queue.connection, job_class=queue.job_class, serializer=queue.serializer ) registry.cleanup() registry = StartedJobRegistry( name=queue.name, connection=queue.connection, job_class=queue.job_class, serializer=queue.serializer ) registry.cleanup() registry = FailedJobRegistry( name=queue.name, connection=queue.connection, job_class=queue.job_class, serializer=queue.serializer ) registry.cleanup()