/usr/share/pyshared/djcelery/snapshot.py is in python-django-celery 2.5.5-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 | from __future__ import absolute_import
from collections import defaultdict
from datetime import datetime, timedelta
from time import time
from django.db import transaction
from django.conf import settings
from django.core.exceptions import ObjectDoesNotExist
from celery import states
from celery.events.state import Task
from celery.events.snapshot import Polaroid
from celery.utils.timeutils import maybe_iso8601
from .models import WorkerState, TaskState
from .utils import make_aware
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))
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 make_aware(datetime.fromtimestamp(heartbeat))
def handle_worker(self, (hostname, worker)):
last_write, obj = self._last_worker_write[hostname]
if not last_write or time() - 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] = (time(), obj)
return obj
def handle_task(self, (uuid, task), worker=None):
if task.worker and task.worker.hostname:
worker = self.handle_worker((task.worker.hostname, task.worker))
return self.update_task(task.state, task_id=uuid,
defaults={"name": task.name,
"args": task.args,
"kwargs": task.kwargs,
"eta": maybe_iso8601(task.eta),
"expires": maybe_iso8601(task.expires),
"state": task.state,
"tstamp": make_aware(datetime.fromtimestamp(
task.timestamp)),
"result": task.result or task.exception,
"traceback": task.traceback,
"runtime": task.runtime,
"worker": worker})
def update_task(self, state, **kwargs):
objects = self.TaskState.objects
defaults = kwargs.pop("defaults", None) or {}
try:
obj = objects.get(**kwargs)
except ObjectDoesNotExist:
if not defaults.get("name"):
return
obj, created = objects.get_or_create(defaults=defaults, **kwargs)
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 _autocommit(self, fun):
try:
fun()
except (KeyboardInterrupt, SystemExit):
transaction.commit()
raise
except Exception:
transaction.rollback()
raise
else:
transaction.commit()
@transaction.commit_manually
def on_shutter(self, state, commit_every=100):
if not state.event_count:
transaction.commit()
return
def _handle_tasks():
for i, task in enumerate(state.tasks.items()):
self.handle_task(task)
if not i % commit_every:
transaction.commit()
self._autocommit(lambda: map(self.handle_worker,
state.workers.items()))
self._autocommit(_handle_tasks)
def on_cleanup(self):
dirty = sum(self.TaskState.objects.expire_by_states(states, expires)
for states, expires in self.expire_states.items())
if dirty:
self.logger.debug(
"Cleanup: Marked %s objects as dirty." % (dirty, ))
self.TaskState.objects.purge()
self.logger.debug("Cleanup: %s objects purged." % (dirty, ))
return dirty
return 0
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