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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 _windup(self):
# override
pass
async def _execute_job(self, jobid, payload, priority):
# override
pass
async def _teardown(self, failed):
# override
pass
async def _work(self):
"""Fetch a job and run it.
Return id."""
jobid, payload, priority = await self._queue.acquire(
jobtype=self._jobtype)
if jobid is None:
raise LookupError
try:
await self._execute_job(jobid, payload, priority)
except JobFailed as err:
raise JobFailed(err.args[0], jobid)
return jobid
async def run(self, batchlimit=1):
"""Start jobs forever."""
while True:
await self._windup()
jobids = []
error = None
low_load = False
try:
for _ in range(batchlimit):
try:
jobids.append(await self._work())
except LookupError:
low_load = True
break
except JobFailed as err:
error = err.args[0]
jobids.append(err.args[1])
break
finally:
if error is not None:
await self._queue.reset(jobids[:-1])
logging.debug(jobids)
await self._queue.fail(jobids[-1], error)
logging.warning("batch failed, reset")
else:
await self._queue.finish(jobids)
await self._teardown(failed=error is not None)
if low_load:
await asyncio.sleep(0.1)
async def start(self, batchlimit=1):
"""Start in background."""
asyncio.ensure_future(self.run(batchlimit))
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