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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
self._need_update = True
self._children = []
async def connect(self, **queuedb):
self._queue = joblib.joblib.JobQueue()
# register event handler on new open job
await self._queue.listen(
self._jobtype + "_open",
self._pushed_new)
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 request(self, jobtype, payload, priority=None):
"""Queue child jobs to be executed after teardown."""
self._children.append((jobtype, payload, priority))
async def poll(self, batchlimit=1):
"""Start a batch of jobs."""
jobs = await self._queue.acquire(jobtype=self._jobtype,
length=batchlimit)
if len(jobs) == 0:
logging.debug("no jobs")
return
await self._windup()
critical_error = False
failed = []
succeeded = []
for jobid, payload, priority in jobs:
try:
await self._execute_job(jobid, payload, priority)
succeeded.append(jobid)
except JobFailed as err:
failed.append((jobid, err.args[0]))
if len(err.args) > 1:
# rollback
critical_error = err.args[1]
if critical_error:
break
else:
critical_error = True # default
if critical_error:
await self._queue.reset(succeeded,
self._jobtype)
logging.warning("batch failed, reset")
else:
await self._queue.finish(succeeded,
self._jobtype)
for jobid, err in failed:
await self._queue.fail(jobid,
self._jobtype,
err)
await self._teardown(failed=critical_error)
# spawn child jobs
for jobt, payloads, priorities in self._children:
await self._queue.request(
jobt, payloads, priorities)
self._children = []
def _pushed_new(self, _):
"""New job event handler."""
logging.debug("received a notification")
self._need_update = True
async def run(self, batchlimit):
"""Request a poll after a push or a timer."""
while True:
while not self._need_update:
await asyncio.sleep(0.01)
logging.debug("polling")
self._need_update = False
await self.poll(batchlimit)
async def start(self, batchlimit=1):
"""Start in background."""
asyncio.ensure_future(self.run(batchlimit))
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