def pump(self, crawler):
"""Start crawling
:param crawler: instance of :class:`pomp.core.base.BaseCrawler`
"""
self.prepare(crawler)
# add ENTRY_REQUESTS to the queue
next_requests = getattr(crawler, 'ENTRY_REQUESTS', None)
if next_requests:
self._put_requests(
iterator(next_requests), None,
)
while True:
if self.queue_lock and self.queue_semaphore_value <= 0:
self.queue_lock.acquire(True)
next_requests = self.queue.get_requests(
count=self.queue_semaphore_value
)
if isinstance(next_requests, StopCommand):
break
self.process_requests(
iterator(next_requests), crawler,
)
self.finish(crawler)
def pump(self, crawler):
"""Start crawling
:param crawler: instance of :class:`pomp.core.base.BaseCrawler`
"""
self.prepare(crawler)
# add ENTRY_REQUESTS to the queue
next_requests = getattr(crawler, 'ENTRY_REQUESTS', None)
if next_requests:
self._put_requests(
iterator(next_requests),
None,
)
while True:
if self.queue_lock and self.queue_semaphore_value <= 0:
self.queue_lock.acquire(True)
next_requests = self.queue.get_requests(
count=self.queue_semaphore_value)
if isinstance(next_requests, StopCommand):
break
self.process_requests(
iterator(next_requests),
crawler,
)
self.finish(crawler)
def on_parse_result(self, crawler, result, response):
requests_from_items = ()
if isinstance(result, types.GeneratorType):
for items in result:
requests_from_items = itertools.chain(
requests_from_items,
self._process_result(
crawler, iterator(items)
)
)
else:
requests_from_items = self._process_result(
crawler, iterator(result)
)
next_requests = crawler.next_requests(response)
if requests_from_items:
if next_requests:
# chain result of crawler extract_items
# and next_requests methods
next_requests = itertools.chain(
requests_from_items,
iterator(next_requests),
)
else:
next_requests = requests_from_items
return next_requests
def _run_crawler_worker(params, response):
pid = os.getpid()
log.debug("Crawler worker pid=%s params=%s", pid, params)
try:
# Initialize crawler worker
worker = params['worker_class'](**params.get('worker_kwargs', {}))
# process response
items = worker.extract_items(response)
next_requests = worker.next_requests(response)
if next_requests:
return list(
itertools.chain(
iterator(items),
iterator(next_requests),
)
)
return list(iterator(items))
except Exception:
log.exception(
"Exception on crawler worker pid=%s request=%s", pid, response
)
raise
def test_iterator():
assert hasattr(iterator('a'), '__iter__')
assert list(iterator('a')) == ['a']
assert hasattr(iterator(1), '__iter__')
assert hasattr(iterator(iterator('b')), '__iter__')
def test_iterator():
assert hasattr(iterator('a'), '__iter__')
assert list(iterator('a')) == ['a']
assert hasattr(iterator(1), '__iter__')
assert hasattr(iterator(iterator('b')), '__iter__')
async def pump(self, crawler):
"""Start crawling
:param crawler: isntance of :class:`pomp.core.base.BaseCrawler`
"""
await self.prepare(crawler)
# add ENTRY_REQUESTS to the queue
next_requests = getattr(crawler, 'ENTRY_REQUESTS', None)
if next_requests:
await self._put_requests(iterator(next_requests))
_pending_iteration_tasks = []
def _on_iterations_task_done(task, future):
_pending_iteration_tasks.remove(task)
while True:
if self.queue_lock and self.queue_semaphore_value <= 0:
await self.queue_lock.acquire()
next_requests = await self.queue.get_requests(
count=self.queue_semaphore_value
)
if isinstance(next_requests, StopCommand):
break
# process requests and do not block loop
task = asyncio.ensure_future(
self.process_requests(
iterator(next_requests), crawler,
)
)
_pending_iteration_tasks.append(task)
task.add_done_callback(
partial(_on_iterations_task_done, task)
)
# loop ended, but we have pending tasks - wait
if _pending_iteration_tasks:
log.debug(
"Wait pending iteration tasks: %s",
len(_pending_iteration_tasks),
)
await asyncio.wait(_pending_iteration_tasks)
await self.finish(crawler)
def response_callback(self, crawler, response):
log.info('Process %s', response)
items = crawler.process(response)
# pipe items
for pipe in self.pipelines:
items = filter(
None,
[pipe.process(crawler, i) for i in items],
)
# get next requests
next_requests = crawler.next_requests(response)
if self.queue:
return next_requests # return requests to pass through queue
else: # execute requests by `witdh first` or `depth first` methods
if crawler.is_depth_first():
if next_requests:
# next recursion step
next_requests = self.downloader.process(
iterator(next_requests), self.response_callback,
crawler)
self._sync_or_async(next_requests, crawler,
self._on_next_requests)
else:
if not self.stoped and not crawler.in_process():
self._stop(crawler)
return None # end of recursion
else:
return next_requests
def _do(self, requests, crawler):
# execute request by downloader
for req in filter_requests(requests):
_requests = self.downloader.process(iterator(req),
self.response_callback,
crawler)
self._sync_or_async(_requests, crawler, self._on_next_requests)
def put_requests(self, requests):
if not self.script_sha:
yield from self.register_script()
for item in iterator(requests):
log.debug("Put to queue: %s", item)
data = self.serializer.dumps(item)
yield from self.redis.evalsha(
self.script_sha, keys=[], args=[item.get_identity(), data, ],
)
def pump(self, crawler):
"""Start crawling
:param crawler: crawler to execute :class:`pomp.core.base.BaseCrawler`
"""
log.info('Prepare downloader: %s', self.downloader)
self.downloader.prepare()
self.stoped = False
crawler._reset_state()
log.info('Start crawler: %s', crawler)
for pipe in self.pipelines:
log.info('Start pipe: %s', pipe)
pipe.start(crawler)
self.stop_deferred = defer.Deferred()
next_requests = getattr(crawler, 'ENTRY_REQUESTS', None)
# process ENTRY_REQUESTS
if next_requests:
next_requests = self.downloader.process(
iterator(crawler.ENTRY_REQUESTS),
self.response_callback,
crawler
)
if self.queue:
if not next_requests:
# empty request - get it from queue
next_requests = self._queue_get_requests()
self._sync_or_async(
next_requests,
crawler,
self._on_next_requests
)
else: # recursive process
if not crawler.is_depth_first():
self._sync_or_async(
next_requests,
crawler,
self._on_next_requests
)
else:
# is width first method
# execute generator
if isinstance(next_requests, types.GeneratorType):
list(next_requests) # fire generator
return self.stop_deferred
def _do(self, requests, crawler):
# execute request by downloader
for req in filter_requests(requests):
_requests = self.downloader.process(
iterator(req),
self.response_callback,
crawler
)
self._sync_or_async(
_requests,
crawler,
self._on_next_requests
)
def _run_crawler_worker(params, response):
pid = os.getpid()
log.debug("Crawler worker pid=%s params=%s", pid, params)
try:
# Initialize crawler worker
worker = params['worker_class'](**params.get('worker_kwargs', {}))
# process response
items = worker.extract_items(response)
next_requests = worker.next_requests(response)
if next_requests:
return list(
itertools.chain(
iterator(items),
iterator(next_requests),
))
return list(iterator(items))
except Exception:
log.exception("Exception on crawler worker pid=%s request=%s", pid,
response)
raise
def put_requests(self, requests):
if not self.script_sha:
yield from self.register_script()
for item in iterator(requests):
log.debug("Put to queue: %s", item)
data = self.serializer.dumps(item)
yield from self.redis.evalsha(
self.script_sha,
keys=[],
args=[
item.get_identity(),
data,
],
)
def prepare(self, crawler):
log.info('Prepare downloader: %s', self.downloader)
self.downloader.prepare()
self.in_progress = 0
log.info('Start crawler: %s', crawler)
for pipe in self.pipelines:
log.info('Start pipe: %s', pipe)
pipe.start(crawler)
# add ENTRY_REQUESTS to the queue
next_requests = getattr(crawler, 'ENTRY_REQUESTS', None)
if next_requests:
self._put_requests(iterator(next_requests), request_done=False)
# configure queue semaphore
self.queue_semaphore = self.get_queue_semaphore()
def pump(self, crawler):
"""Start crawling
:param crawler: crawler to execute :class:`pomp.core.base.BaseCrawler`
"""
log.info('Prepare downloader: %s', self.downloader)
self.downloader.prepare()
self.stoped = False
crawler._reset_state()
log.info('Start crawler: %s', crawler)
for pipe in self.pipelines:
log.info('Start pipe: %s', pipe)
pipe.start(crawler)
self.stop_deferred = defer.Deferred()
next_requests = getattr(crawler, 'ENTRY_REQUESTS', None)
# process ENTRY_REQUESTS
if next_requests:
next_requests = self.downloader.process(
iterator(crawler.ENTRY_REQUESTS), self.response_callback,
crawler)
if self.queue:
if not next_requests:
# empty request - get it from queue
next_requests = self._queue_get_requests()
self._sync_or_async(next_requests, crawler, self._on_next_requests)
else: # recursive process
if not crawler.is_depth_first():
self._sync_or_async(next_requests, crawler,
self._on_next_requests)
else:
# is width first method
# execute generator
if isinstance(next_requests, types.GeneratorType):
list(next_requests) # fire generator
return self.stop_deferred
def pump(self, crawler):
"""Start crawling
:param crawler: isntance of :class:`pomp.core.base.BaseCrawler`
"""
self.prepare(crawler)
while True:
# do not fetch from queue request more than downloader can process
if self.queue_semaphore:
self.queue_semaphore.acquire(blocking=True)
next_requests = self.queue.get_requests()
if isinstance(next_requests, StopCommand):
break
self.process_requests(
iterator(next_requests), crawler,
)
self.finish(crawler)
def response_callback(self, crawler, response):
log.info('Process %s', response)
items = crawler.process(response)
# pipe items
for pipe in self.pipelines:
items = filter(
None,
[pipe.process(crawler, i) for i in items],
)
# get next requests
next_requests = crawler.next_requests(response)
if self.queue:
return next_requests # return requests to pass through queue
else: # execute requests by `witdh first` or `depth first` methods
if crawler.is_depth_first():
if next_requests:
# next recursion step
next_requests = self.downloader.process(
iterator(next_requests),
self.response_callback,
crawler
)
self._sync_or_async(
next_requests,
crawler,
self._on_next_requests
)
else:
if not self.stoped and not crawler.in_process():
self._stop(crawler)
return None # end of recursion
else:
return next_requests
def on_parse_result(self, crawler, result, response): # asyncio: async
if isinstance(result, types.GeneratorType):
for items in result:
for request in self._process_items(
crawler, iterator(items),
response=response): # asyncio: async # noqa
self._put_requests( # asyncio: await
iterator(request),
crawler=crawler,
response=response,
)
else:
for request in self._process_items(
crawler, iterator(result),
response=response): # asyncio: async # noqa
self._put_requests( # asyncio: await
iterator(request),
crawler=crawler,
response=response,
)
next_requests = (
crawler.next_requests(response) # asyncio: await _co(REPLACE)
)
if hasattr(next_requests, '__anext__'): # support async generators
for request in next_requests: # asyncio: async
self._put_requests( # asyncio: await
iterator(request),
crawler=crawler,
response=response,
)
else:
self._put_requests( # asyncio: await
iterator(next_requests),
crawler=crawler,
response=response,
)
self._request_done(response, crawler) # asyncio: await
def on_parse_result(self, crawler, result, response): # asyncio: async
if isinstance(result, types.GeneratorType):
for items in result:
for request in self._process_items(crawler, iterator(items), response=response): # asyncio: async # noqa
self._put_requests( # asyncio: await
iterator(request),
crawler=crawler,
response=response,
)
else:
for request in self._process_items(crawler, iterator(result), response=response): # asyncio: async # noqa
self._put_requests( # asyncio: await
iterator(request),
crawler=crawler,
response=response,
)
next_requests = (
crawler.next_requests(response) # asyncio: await _co(REPLACE)
)
if hasattr(next_requests, '__anext__'): # support async generators
for request in next_requests: # asyncio: async
self._put_requests( # asyncio: await
iterator(request),
crawler=crawler,
response=response,
)
else:
self._put_requests( # asyncio: await
iterator(next_requests),
crawler=crawler,
response=response,
)
self._request_done(response, crawler) # asyncio: await
def filter_requests(requests):
return filter(lambda x: True if x else False, iterator(requests))
def get(self, requests):
responses = []
for request in iterator(requests):
response = self._fetch(request)
responses.append(response)
return responses
def get(self, requests):
for request in iterator(requests):
yield self._fetch(request)
def get(self, requests):
responses = []
for request in iterator(requests):
response = self._fetch(request)
responses.append(response)
return responses
def filter_requests(requests):
return filter(
lambda x: True if x else False,
iterator(requests)
)
def get(self, requests):
for request in iterator(requests):
yield self.worker.get_one(request)
def get(self, requests):
for request in iterator(requests):
yield self._fetch(request)
