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from __future__ import absolute_import, unicode_literals
from collections import defaultdict
from datetime import timedelta
from django.conf import settings
from celery import states
from celery.events.state import Task
from celery.events.snapshot import Polaroid
from celery.five import monotonic
from celery.utils.log import get_logger
try:
from celery.utils.timeutils import maybe_iso8601
except ImportError:
from celery.utils.time import maybe_iso8601
from .models import WorkerState, TaskState
from .utils import fromtimestamp, correct_awareness
WORKER_UPDATE_FREQ = 60 # limit worker timestamp write freq.
SUCCESS_STATES = frozenset([states.SUCCESS])
# Expiry can be timedelta or None for never expire.
EXPIRE_SUCCESS = getattr(settings, 'CELERYCAM_EXPIRE_SUCCESS',
timedelta(days=1))
EXPIRE_ERROR = getattr(settings, 'CELERYCAM_EXPIRE_ERROR',
timedelta(days=3))
EXPIRE_PENDING = getattr(settings, 'CELERYCAM_EXPIRE_PENDING',
timedelta(days=5))
NOT_SAVED_ATTRIBUTES = frozenset(['name', 'args', 'kwargs', 'eta'])
logger = get_logger(__name__)
debug = logger.debug
class Camera(Polaroid):
TaskState = TaskState
WorkerState = WorkerState
clear_after = True
worker_update_freq = WORKER_UPDATE_FREQ
expire_states = {
SUCCESS_STATES: EXPIRE_SUCCESS,
states.EXCEPTION_STATES: EXPIRE_ERROR,
states.UNREADY_STATES: EXPIRE_PENDING,
}
def __init__(self, *args, **kwargs):
super(Camera, self).__init__(*args, **kwargs)
self._last_worker_write = defaultdict(lambda: (None, None))
def get_heartbeat(self, worker):
try:
heartbeat = worker.heartbeats[-1]
except IndexError:
return
return fromtimestamp(heartbeat)
def handle_worker(self, hostname_worker):
(hostname, worker) = hostname_worker
last_write, obj = self._last_worker_write[hostname]
if not last_write or \
monotonic() - last_write > self.worker_update_freq:
obj, _ = self.WorkerState.objects.update_or_create(
hostname=hostname,
defaults={'last_heartbeat': self.get_heartbeat(worker)},
)
self._last_worker_write[hostname] = (monotonic(), obj)
return obj
def handle_task(self, uuid_task, worker=None):
"""Handle snapshotted event."""
uuid, task = uuid_task
if task.worker and task.worker.hostname:
worker = self.handle_worker(
(task.worker.hostname, task.worker),
)
defaults = {
'name': task.name,
'args': task.args,
'kwargs': task.kwargs,
'eta': correct_awareness(maybe_iso8601(task.eta)),
'expires': correct_awareness(maybe_iso8601(task.expires)),
'state': task.state,
'tstamp': fromtimestamp(task.timestamp),
'result': task.result or task.exception,
'traceback': task.traceback,
'runtime': task.runtime,
'worker': worker
}
# Some fields are only stored in the RECEIVED event,
# so we should remove these from default values,
# so that they are not overwritten by subsequent states.
[defaults.pop(attr, None) for attr in NOT_SAVED_ATTRIBUTES
if defaults[attr] is None]
return self.update_task(task.state,
task_id=uuid, defaults=defaults)
def update_task(self, state, **kwargs):
objects = self.TaskState.objects
defaults = kwargs.pop('defaults', None) or {}
if not defaults.get('name'):
return
obj, created = objects.get_or_create(defaults=defaults, **kwargs)
if created:
return obj
else:
if states.state(state) < states.state(obj.state):
keep = Task.merge_rules[states.RECEIVED]
defaults = dict(
(k, v) for k, v in defaults.items()
if k not in keep
)
for k, v in defaults.items():
setattr(obj, k, v)
obj.save()
return obj
def on_shutter(self, state, commit_every=100):
def _handle_tasks():
for i, task in enumerate(state.tasks.items()):
self.handle_task(task)
for worker in state.workers.items():
self.handle_worker(worker)
_handle_tasks()
def on_cleanup(self):
expired = (self.TaskState.objects.expire_by_states(states, expires)
for states, expires in self.expire_states.items())
dirty = sum(item for item in expired if item is not None)
if dirty:
debug('Cleanup: Marked %s objects as dirty.', dirty)
self.TaskState.objects.purge()
debug('Cleanup: %s objects purged.', dirty)
return dirty
return 0