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#!/usr/bin/python
import asyncio
import logging
import joblib.joblib
class JobFailed(Exception):
pass
class Worker(object):
"""Abstract service worker class."""
def __init__(self, jobtype):
self._queue = None
self._jobtype = jobtype
async def connect(self, **queuedb):
self._queue = joblib.joblib.JobQueue()
await self._queue.connect(**queuedb)
await self._queue.setup()
async def setup(self):
# override
pass
async def _execute_job(self, jobid, payload, priority):
# override
pass
async def _work(self):
"""Fetch a job and run it."""
jobid, payload, priority = await self._queue.acquire(
jobtype=self._jobtype)
if jobid is None:
raise LookupError("no jobs available")
try:
await self._execute_job(jobid, payload, priority)
await self._queue.finish(jobid)
except JobFailed as error:
logging.warning("%s: failed with %s", jobid,
error.args[0])
await self._queue.fail(jobid, error.args[0])
async def run(self):
"""Start jobs forever."""
while True:
try:
await self._work()
except LookupError:
await asyncio.sleep(1)
async def start(self, number=1):
"""Start jobs in background."""
for _ in range(number):
asyncio.ensure_future(self.run())
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