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# Copyright (c) 2017–2018 crocoite contributors
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
"""
Celery distributed tasks
"""
import os, logging
from urllib.parse import urlsplit
from datetime import datetime
from operator import attrgetter
from itertools import chain
def _monkeyPatchSyncTasks ():
""" Result sets don’t support the argument disable_sync_subtasks argument """
import celery.result
celery.result.assert_will_not_block = lambda: None
_monkeyPatchSyncTasks ()
from celery import Celery
from celery.utils.log import get_task_logger
from .browser import ChromeService, BrowserCrashed
from .controller import SinglePageController, ControllerSettings, RecursiveController, defaultSettings, DepthLimit, StatsHandler
from . import behavior
from .cli import parseRecursive
from .warc import WarcHandler
app = Celery ('crocoite.distributed')
app.config_from_object('celeryconfig')
app.conf.task_routes = {
'crocoite.task.archive': {'queue': 'crocoite.archive'},
'crocoite.task.controller': {'queue': 'crocoite.controller'},
# <method>.chunks is actually a starmap job
'celery.starmap': {'queue': 'crocoite.archive'},
}
app.conf.task_default_queue = 'crocoite.default'
# disable prefetching, since our tasks usually run for a _very_ long time
app.conf.worker_prefetch_multiplier = 1
logger = get_task_logger('crocoite.distributed.archive')
@app.task(bind=True, track_started=True)
def archive (self, url, settings, enabledBehaviorNames):
"""
Archive a single URL
Supports these config keys (celeryconfig):
warc_filename = '{domain}-{date}-{id}.warc.gz'
temp_dir = '/tmp/'
finished_dir = '/tmp/finished'
"""
parsedUrl = urlsplit (url)
outFile = app.conf.warc_filename.format (
id=self.request.root_id,
domain=parsedUrl.hostname.replace ('/', '-'),
date=datetime.utcnow ().isoformat (),
)
outPath = os.path.join (app.conf.temp_dir, outFile)
fd = open (outPath, 'wb')
handler = [StatsHandler (), WarcHandler (fd)]
enabledBehavior = list (filter (lambda x: x.name in enabledBehaviorNames, behavior.available))
settings = ControllerSettings (**settings)
try:
c = SinglePageController (url, fd, behavior=enabledBehavior,
settings=settings, handler=handler)
c.run ()
except BrowserCrashed:
# nothing we can do about that
logger.error ('browser crashed for {}'.format (url))
os.makedirs (app.conf.finished_dir, exist_ok=True)
outPath = os.path.join (app.conf.finished_dir, outFile)
os.rename (fd.name, outPath)
return handler[0].stats
from collections import UserDict
class IntegerDict (UserDict):
""" Dict with dict/dict per-item arithmetic propagation, i.e. {1: 2}+{1: 1}={1: 3} """
def __add__ (self, b):
newdict = self.__class__ (self)
for k, v in b.items ():
if k in self:
newdict[k] += v
else:
newdict[k] = v
return newdict
class DistributedRecursiveController (RecursiveController):
""" Distributed, recursive controller using celery """
__slots__ = ('concurrency', 'stats')
def __init__ (self, url, service=ChromeService (), behavior=behavior.available, \
logger=logging.getLogger(__name__), settings=defaultSettings,
recursionPolicy=DepthLimit (0), concurrency=1):
super ().__init__ (url, None, service, behavior, logger, settings, recursionPolicy)
self.concurrency = concurrency
self.stats = IntegerDict ()
def fetch (self, urls):
def chunksIter (urls):
for u in urls:
yield (u, self.settings.toDict (), list (map (attrgetter ('name'), self.behavior)))
itemsPerTask = len (urls)//self.concurrency
if itemsPerTask <= 0:
itemsPerTask = len (urls)
result = archive.chunks (chunksIter (urls), itemsPerTask).apply_async ().get ()
self.stats = sum (chain.from_iterable (result), self.stats)
@app.task(bind=True, track_started=True)
def controller (self, url, settings, enabledBehaviorNames, recursive, concurrency):
""" Recursive controller """
recursionPolicy = parseRecursive (recursive, url)
enabledBehavior = list (filter (lambda x: x.name in enabledBehaviorNames, behavior.available))
settings = ControllerSettings (**settings)
c = DistributedRecursiveController (url, None, behavior=enabledBehavior,
settings=settings, recursionPolicy=recursionPolicy, concurrency=concurrency)
c.run ()
return dict (c.stats)
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