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import json
import os
import signal
from typing import TYPE_CHECKING, Dict, Any
if TYPE_CHECKING:
from redis import Redis
from .worker import Worker
from rq.exceptions import InvalidJobOperation
from rq.job import Job
PUBSUB_CHANNEL_TEMPLATE = 'rq:pubsub:%s'
def send_command(connection: 'Redis', worker_name: str, command: str, **kwargs):
"""
Sends a command to a worker.
A command is just a string, availble commands are:
- `shutdown`: Shuts down a worker
- `kill-horse`: Command for the worker to kill the current working horse
- `stop-job`: A command for the worker to stop the currently running job
The command string will be parsed into a dictionary and send to a PubSub Topic.
Workers listen to the PubSub, and `handle` the specific command.
Args:
connection (Redis): A Redis Connection
worker_name (str): The Job ID
"""
payload = {'command': command}
if kwargs:
payload.update(kwargs)
connection.publish(PUBSUB_CHANNEL_TEMPLATE % worker_name, json.dumps(payload))
def parse_payload(payload: Dict[Any, Any]) -> Dict[Any, Any]:
"""
Returns a dict of command data
Args:
payload (dict): Parses the payload dict.
"""
return json.loads(payload.get('data').decode())
def send_shutdown_command(connection: 'Redis', worker_name: str):
"""
Sends a command to shutdown a worker.
Args:
connection (Redis): A Redis Connection
worker_name (str): The Job ID
"""
send_command(connection, worker_name, 'shutdown')
def send_kill_horse_command(connection: 'Redis', worker_name: str):
"""
Tell worker to kill it's horse
Args:
connection (Redis): A Redis Connection
worker_name (str): The Job ID
"""
send_command(connection, worker_name, 'kill-horse')
def send_stop_job_command(connection: 'Redis', job_id: str, serializer=None):
"""
Instruct a worker to stop a job
Args:
connection (Redis): A Redis Connection
job_id (str): The Job ID
serializer (): The serializer
"""
job = Job.fetch(job_id, connection=connection, serializer=serializer)
if not job.worker_name:
raise InvalidJobOperation('Job is not currently executing')
send_command(connection, job.worker_name, 'stop-job', job_id=job_id)
def handle_command(worker: 'Worker', payload: Dict[Any, Any]):
"""Parses payload and routes commands to the worker.
Args:
worker (Worker): The worker to use
payload (Dict[Any, Any]): The Payload
"""
if payload['command'] == 'stop-job':
handle_stop_job_command(worker, payload)
elif payload['command'] == 'shutdown':
handle_shutdown_command(worker)
elif payload['command'] == 'kill-horse':
handle_kill_worker_command(worker, payload)
def handle_shutdown_command(worker: 'Worker'):
"""Perform shutdown command.
Args:
worker (Worker): The worker to use.
"""
worker.log.info('Received shutdown command, sending SIGINT signal.')
pid = os.getpid()
os.kill(pid, signal.SIGINT)
def handle_kill_worker_command(worker: 'Worker', payload: Dict[Any, Any]):
"""
Stops work horse
Args:
worker (Worker): The worker to stop
payload (Dict[Any, Any]): The payload.
"""
worker.log.info('Received kill horse command.')
if worker.horse_pid:
worker.log.info('Kiling horse...')
worker.kill_horse()
else:
worker.log.info('Worker is not working, kill horse command ignored')
def handle_stop_job_command(worker: 'Worker', payload: Dict[Any, Any]):
"""Handles stop job command.
Args:
worker (Worker): The worker to use
payload (Dict[Any, Any]): The payload.
"""
job_id = payload.get('job_id')
worker.log.debug('Received command to stop job %s', job_id)
if job_id and worker.get_current_job_id() == job_id:
# Sets the '_stopped_job_id' so that the job failure handler knows it
# was intentional.
worker._stopped_job_id = job_id
worker.kill_horse()
else:
worker.log.info('Not working on job %s, command ignored.', job_id)
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