def worker_loop():
''' Pulls a job from the queue and runs it invoking run_job.py '''
uri = '%s/jobs_queued.json?orderBy="$key"&limitToLast=10' % DB
jobs = req('GET', uri)
if not jobs:
return
# Transactionally acquire a job. Deal with races (two workers trying to
# acquire the same job).
job = None
job_id = None
for job_id in sorted(jobs.keys(), reverse=True):
job = try_acquire_job(job_id)
if job is not None:
break
logging.info('Raced while trying to acquire job %s, retrying', job_id)
time.sleep(int(random.random() * 3))
if job is None:
logging.error('Failed to acquire a job')
return
logging.info('Starting job %s', job_id)
# Update the db, move the job to the running queue.
patch_obj = {
'jobs_queued/' + job_id: {}, # = DELETE
'jobs_running/' + job_id: {
'worker': WORKER_NAME
},
'workers/' + WORKER_NAME: make_worker_obj('RUNNING', job_id=job_id)
}
req('PATCH', '%s.json' % DB, body=patch_obj)
cmd = [os.path.join(CUR_DIR, 'run_job.py'), job_id]
# Propagate the worker's PERFETTO_ vars and merge with the job-specific vars.
env = dict(os.environ, **{k: str(v) for (k, v) in job['env'].items()})
job_runner = subprocess.Popen(cmd, env=env)
# Run the job in a python subprocess, to isolate the main loop from logs
# uploader failures.
res = None
cancelled = False
timed_out = False
time_started = time.time()
time_last_db_poll = time_started
polled_status = 'STARTED'
while res is None:
time.sleep(0.25)
res = job_runner.poll()
now = time.time()
if now - time_last_db_poll > 10: # Throttle DB polling.
polled_status = req('GET', '%s/jobs/%s/status.json' % (DB, job_id))
time_last_db_poll = now
if now - time_started > JOB_TIMEOUT_SEC:
logging.info('Job %s timed out, terminating', job_id)
timed_out = True
job_runner.terminate()
if (sigterm.is_set() or polled_status != 'STARTED') and not cancelled:
logging.info('Job %s cancelled, terminating', job_id)
cancelled = True
job_runner.terminate()
status = (
'INTERRUPTED' if sigterm.is_set() else 'CANCELLED' if cancelled else
'TIMED_OUT' if timed_out else 'COMPLETED' if res == 0 else 'FAILED')
logging.info('Job %s %s with code %s', job_id, status, res)
# Update the DB, unless the job has been cancelled. The "is not None"
# condition deals with a very niche case, that is, avoid creating a partial
# job entry after doing a full clear of the DB (which is super rare, happens
# only when re-deploying the CI).
if polled_status is not None:
patch = {
'jobs/%s/status' % job_id: status,
'jobs/%s/exit_code' % job_id: {} if res is None else res,
'jobs/%s/time_ended' % job_id: utc_now_iso(),
'jobs_running/%s' % job_id: {}, # = DELETE
}
req('PATCH', '%s.json' % (DB), body=patch)
def create_stackdriver_metric_definitions():
logging.info('Creating Stackdriver metric definitions')
for name, metric in STACKDRIVER_METRICS.iteritems():
logging.info('Creating metric %s', name)
req('POST', STACKDRIVER_API + '/metricDescriptors', body=metric)
def update_queue_metrics(handler):
# Update the stackdriver metric that will drive the autoscaler.
queued = req('GET', DB + '/jobs_queued.json?shallow=true') or {}
running = req('GET', DB + '/jobs_running.json?shallow=true') or {}
write_metrics({'ci_job_queue_len': {'v': len(queued) + len(running)}})
def delete_job_logs(handler):
req('DELETE', '%s/logs/%s.json' % (DB, handler.request.get('job_id')))
def delete_expired_logs(handler):
logs = req('GET', '%s/logs.json?shallow=true' % (DB)) or {}
for job_id in logs.iterkeys():
age_days = (datetime.now() - datetime.strptime(job_id[:8], '%Y%m%d')).days
if age_days > LOGS_TTL_DAYS:
defer('delete_job_logs', job_id=job_id)
def check_pending_cls(handler):
# Check if any pending CL has completed (all jobs are done). If so publish
# the comment and vote on the CL.
pending_cls = req('GET', '%s/cls_pending.json' % DB) or {}
for cl_and_ps, _ in pending_cls.iteritems():
defer('check_pending_cl', cl_and_ps=cl_and_ps)
