def __init__(self, spider, socket_number):
"""
Args:
spider: argument is not used in multicurl transport
"""
self.spider = spider
self.socket_number = socket_number
self.multi = pycurl.CurlMulti()
self.multi.handles = []
self.freelist = []
self.registry = {}
self.connection_count = {}
self.sigint_handler = PycurlSigintHandler()
self.network_op_lock = Lock()
# Create curl instances
for _ in six.moves.range(self.socket_number):
curl = pycurl.Curl()
self.connection_count[id(curl)] = 0
self.freelist.append(curl)
# self.multi.handles.append(curl)
self.spawner = self.create_worker(self.spawner_callback)
self.async_loop = self.create_worker(self.async_loop_callback)
self.register_workers(self.spawner, self.async_loop)
def test_record(self):
handler = PycurlSigintHandler()
with handler.record():
sys.stderr.write('one-1')
sys.stderr.write('two-2')
val = handler.get_output()
self.assertEqual('one-1two-2', val)
def test_record(self):
handler = PycurlSigintHandler()
with handler.record():
sys.stderr.write('one-1')
sys.stderr.write('two-2')
val = handler.get_output()
self.assertEqual('one-1two-2', val)
def request(self):
sigint_handler = PycurlSigintHandler()
try:
with sigint_handler.handle_sigint():
self.curl.perform()
except pycurl.error as ex:
new_ex = build_grab_exception(ex, self.curl)
if new_ex:
raise new_ex # pylint: disable=raising-bad-type
except Exception as ex: # pylint: disable=broad-except
six.reraise(error.GrabInternalError, error.GrabInternalError(ex),
sys.exc_info()[2])
finally:
self.curl.grab_callback_interrupted = False
def request(self):
sigint_handler = PycurlSigintHandler()
try:
with sigint_handler.handle_sigint():
self.curl.perform()
except pycurl.error as ex:
new_ex = build_grab_exception(ex, self.curl)
if new_ex:
raise new_ex # pylint: disable=raising-bad-type
except Exception as ex: # pylint: disable=broad-except
six.reraise(error.GrabInternalError, error.GrabInternalError(ex),
sys.exc_info()[2])
finally:
self.curl.grab_callback_interrupted = False
def request(self):
sigint_handler = PycurlSigintHandler()
try:
with sigint_handler.handle_sigint():
self.curl.perform()
except pycurl.error as ex:
# CURLE_WRITE_ERROR (23)
# An error occurred when writing received data to a local file, or
# an error was returned to libcurl from a write callback.
# This exception should be ignored if grab_callback_interrupted
# flag # is enabled (this happens when nohead or nobody options
# enabled)
#
# Also this error is raised when curl receives KeyboardInterrupt
# while it is processing some callback function
# (WRITEFUNCTION, HEADERFUNCTIO, etc)
# If you think WTF then see details here:
# https://github.com/pycurl/pycurl/issues/413
if ex.args[0] == 23:
if getattr(self.curl, 'grab_callback_interrupted',
None) is True:
# This is expected error caused by
# interruptted execution of body_processor callback
# FIXME: is it set automatically?
self.curl.grab_callback_interrupted = False
else:
raise error.GrabNetworkError(ex.args[0], ex.args[1])
else:
if ex.args[0] == 28:
raise error.GrabTimeoutError(ex.args[0], ex.args[1])
elif ex.args[0] == 7:
raise error.GrabConnectionError(ex.args[0], ex.args[1])
elif ex.args[0] == 67:
raise error.GrabAuthError(ex.args[0], ex.args[1])
elif ex.args[0] == 47:
raise error.GrabTooManyRedirectsError(
ex.args[0], ex.args[1])
elif ex.args[0] == 6:
raise error.GrabCouldNotResolveHostError(
ex.args[0], ex.args[1])
else:
raise error.GrabNetworkError(ex.args[0], ex.args[1])
except Exception as ex: # pylint: disable=broad-except
six.reraise(error.GrabInternalError, error.GrabInternalError(ex),
sys.exc_info()[2])
def __init__(self, spider, socket_number): # pylint: disable=unused-argument
"""
Args:
spider: argument is not used in multicurl transport
"""
self.socket_number = socket_number
self.multi = pycurl.CurlMulti()
self.multi.handles = []
self.freelist = []
self.registry = {}
self.connection_count = {}
self.network_op_lock = Lock()
self.sigint_handler = PycurlSigintHandler()
# Create curl instances
for _ in six.moves.range(self.socket_number):
curl = pycurl.Curl()
self.connection_count[id(curl)] = 0
self.freelist.append(curl)
class NetworkServiceMulticurl(BaseService):
def __init__(self, spider, socket_number):
"""
Args:
spider: argument is not used in multicurl transport
"""
self.spider = spider
self.socket_number = socket_number
self.multi = pycurl.CurlMulti()
self.multi.handles = []
self.freelist = []
self.registry = {}
self.connection_count = {}
self.sigint_handler = PycurlSigintHandler()
self.network_op_lock = Lock()
# Create curl instances
for _ in six.moves.range(self.socket_number):
curl = pycurl.Curl()
self.connection_count[id(curl)] = 0
self.freelist.append(curl)
# self.multi.handles.append(curl)
self.spawner = self.create_worker(self.spawner_callback)
self.async_loop = self.create_worker(self.async_loop_callback)
self.register_workers(self.spawner, self.async_loop)
def async_loop_callback(self, worker):
while not worker.stop_event.is_set():
worker.process_pause_signal()
self.process_handlers()
time.sleep(0.01)
def spawner_callback(self, worker):
while not worker.stop_event.is_set():
worker.process_pause_signal()
if self.get_free_threads_number():
task = self.spider.get_task_from_queue()
if task is None or task is True:
time.sleep(0.1)
else:
worker.is_busy_event.set()
try:
task.network_try_count += 1 # pylint: disable=no-member
is_valid, reason = self.spider.check_task_limits(task)
if is_valid:
grab = self.spider.setup_grab_for_task(task)
self.spider.submit_task_to_transport(task, grab)
else:
self.spider.log_rejected_task(task, reason)
# pylint: disable=no-member
handler = task.get_fallback_handler(self.spider)
# pylint: enable=no-member
if handler:
handler(task)
finally:
worker.is_busy_event.clear()
for result, task in self.iterate_results():
self.spider.task_dispatcher.input_queue.put(
(result, task, None), )
def ready_for_task(self):
return len(self.freelist)
def get_free_threads_number(self):
return len(self.freelist)
def get_active_threads_number(self):
return self.socket_number - len(self.freelist)
def process_connection_count(self, curl):
curl_id = id(curl)
self.connection_count[curl_id] += 1
if self.connection_count[curl_id] > 100:
del self.connection_count[curl_id]
del curl
new_curl = pycurl.Curl()
self.connection_count[id(new_curl)] = 1
return new_curl
else:
return curl
def start_task_processing(self, task, grab, grab_config_backup):
curl = self.process_connection_count(self.freelist.pop())
self.registry[id(curl)] = {
'grab': grab,
'grab_config_backup': grab_config_backup,
'task': task,
}
grab.transport.curl = curl
try:
grab.prepare_request()
# Enable pycurl built-in redirect processing
# In non-spider mode Grab handles redirects itself
# by parsing headers and following Location URls
# In spider mode that would require to create
# new Task objects for each 30* redirect
# Maybe that would be implemented in future
# For now multicurl transport just uses builtin pycurl
# ability to handle 30* redirects
grab.transport.curl.setopt(
pycurl.FOLLOWLOCATION,
1 if grab.config['follow_location'] else 0)
grab.log_request()
except Exception:
# If some error occurred while processing the request arguments
# then we should put curl object back to free list
del self.registry[id(curl)]
self.freelist.append(curl)
raise
else:
# Add configured curl instance to multi-curl processor
try:
self.network_op_lock.acquire()
with self.sigint_handler.handle_sigint():
self.multi.add_handle(curl)
finally:
self.network_op_lock.release()
def process_handlers(self):
try:
self.network_op_lock.acquire()
with self.sigint_handler.handle_sigint():
rlist, wlist, xlist = self.multi.fdset()
if rlist or wlist or xlist:
with self.sigint_handler.handle_sigint():
timeout = self.multi.timeout()
if timeout and timeout > 0:
select.select(rlist, wlist, xlist, timeout / 1000.0)
else:
pass
while True:
with self.sigint_handler.handle_sigint():
status, _ = self.multi.perform()
if status != pycurl.E_CALL_MULTI_PERFORM:
break
finally:
self.network_op_lock.release()
def iterate_results(self):
while True:
try:
self.network_op_lock.acquire()
with self.sigint_handler.handle_sigint():
queued_messages, ok_list, fail_list = (
self.multi.info_read())
finally:
self.network_op_lock.release()
#except Exception as ex:
# # Usually that should not happen
# logging.error('', exc_info=ex)
# continue
results = []
for curl in ok_list:
results.append((True, curl, None, None, None))
for curl, ecode, emsg in fail_list:
curl.grab_callback_interrupted = False
try:
raise pycurl.error(ecode, emsg)
except Exception as exc: # pylint: disable=broad-except
grab_exc = build_grab_exception(exc, curl)
# grab_exc could be None if the pycurl error
# was expected (could be in case of
# body_maxsize and other options)
if grab_exc:
results.append((False, curl, ecode, emsg, grab_exc))
else:
results.append((True, curl, None, None, None))
for is_ok, curl, ecode, emsg, grab_exc in results:
# FORMAT: {is_ok, grab, grab_config_backup, task,
# ecode, emsg, error_abbr, exc}
curl_id = id(curl)
task = self.registry[curl_id]['task']
grab = self.registry[curl_id]['grab']
grab_config_backup =\
self.registry[curl_id]['grab_config_backup']
try:
self.network_op_lock.acquire()
grab.process_request_result()
except GrabTooManyRedirectsError:
ecode = ERROR_TOO_MANY_REDIRECTS
emsg = 'Too many meta refresh redirects'
is_ok = False
finally:
self.network_op_lock.release()
#except Exception as ex:
# logging.error('', exc_info=ex)
# ecode = ERROR_INTERNAL_GRAB_ERROR
# emsg = 'Internal grab error'
# is_ok = False
grab.doc.error_code = ecode
grab.doc.error_msg = emsg
grab.exception = grab_exc
# Free resources
del self.registry[curl_id]
grab.transport.curl = None
if is_ok:
error_abbr = None
else:
error_abbr = ERRNUM_TAG.get(ecode, 'unknown-%d' % ecode)
yield {
'ok': is_ok,
'ecode': ecode,
'emsg': emsg,
'error_abbr': error_abbr,
'exc': grab_exc,
'grab': grab,
'grab_config_backup': grab_config_backup,
}, task
try:
self.network_op_lock.acquire()
with self.sigint_handler.handle_sigint():
self.multi.remove_handle(curl)
finally:
self.network_op_lock.release()
curl.reset()
self.freelist.append(curl)
if not queued_messages:
break
class MulticurlTransport(object):
def __init__(self, spider, socket_number):
"""
Args:
spider: argument is not used in multicurl transport
"""
del spider # is not used in this transport
self.socket_number = socket_number
self.multi = pycurl.CurlMulti()
self.multi.handles = []
self.freelist = []
self.registry = {}
self.connection_count = {}
self.network_op_lock = Lock()
self.sigint_handler = PycurlSigintHandler()
# Create curl instances
for _ in six.moves.range(self.socket_number):
curl = pycurl.Curl()
self.connection_count[id(curl)] = 0
self.freelist.append(curl)
# self.multi.handles.append(curl)
def ready_for_task(self):
return len(self.freelist)
def get_free_threads_number(self):
return len(self.freelist)
def get_active_threads_number(self):
return self.socket_number - len(self.freelist)
def process_connection_count(self, curl):
curl_id = id(curl)
self.connection_count[curl_id] += 1
if self.connection_count[curl_id] > 100:
del self.connection_count[curl_id]
del curl
new_curl = pycurl.Curl()
self.connection_count[id(new_curl)] = 1
return new_curl
else:
return curl
def start_task_processing(self, task, grab, grab_config_backup):
self.network_op_lock.acquire()
try:
curl = self.process_connection_count(self.freelist.pop())
self.registry[id(curl)] = {
'grab': grab,
'grab_config_backup': grab_config_backup,
'task': task,
}
grab.transport.curl = curl
try:
grab.prepare_request()
# Enable pycurl built-in redirect processing
# In non-spider mode Grab handles redirects itself
# by parsing headers and following Location URls
# In spider mode that would require to create
# new Task objects for each 30* redirect
# Maybe that would be implemented in future
# For now multicurl transport just uses builtin pycurl
# ability to handle 30* redirects
grab.transport.curl.setopt(
pycurl.FOLLOWLOCATION,
1 if grab.config['follow_location'] else 0)
grab.log_request()
except Exception:
# If some error occurred while processing the request arguments
# then we should put curl object back to free list
del self.registry[id(curl)]
self.freelist.append(curl)
raise
else:
# Add configured curl instance to multi-curl processor
with self.sigint_handler.handle_sigint():
self.multi.add_handle(curl)
finally:
self.network_op_lock.release()
def process_handlers(self):
# Ok, frankly I have really bad understanding of
# how to deal with multicurl sockets ;-)
# It is a sort of miracle that Grab actually works
self.network_op_lock.acquire()
with self.sigint_handler.handle_sigint():
rlist, wlist, xlist = self.multi.fdset()
if rlist or wlist or xlist:
with self.sigint_handler.handle_sigint():
timeout = self.multi.timeout()
if timeout and timeout > 0:
select.select(rlist, wlist, xlist, timeout / 1000.0)
else:
pass
while True:
with self.sigint_handler.handle_sigint():
status, _ = self.multi.perform()
if status != pycurl.E_CALL_MULTI_PERFORM:
break
self.network_op_lock.release()
def iterate_results(self):
while True:
#try:
with self.sigint_handler.handle_sigint():
queued_messages, ok_list, fail_list = self.multi.info_read()
#except Exception as ex:
# # Usually that should not happen
# logging.error('', exc_info=ex)
# continue
results = []
for curl in ok_list:
results.append((True, curl, None, None))
for curl, ecode, emsg in fail_list:
# CURLE_WRITE_ERROR (23)
# An error occurred when writing received data
# to a local file, or
# an error was returned to libcurl from a write callback.
# This exception should be ignored if _callback_interrupted
# flag
# is enabled (this happens when nohead or
# nobody options enabeld)
#
# Also this error is raised when curl receives
# KeyboardInterrupt
# while it is processing some callback function
# (WRITEFUNCTION, HEADERFUNCTIO, etc)
if ecode == 23:
if curl.grab_callback_interrupted is True:
# FIXME: that flag should be set automatically
# FIXME: write tests to test this flag
curl.grab_callback_interrupted = False
results.append((True, curl, None, None))
else:
results.append((False, curl, ecode, emsg))
else:
results.append((False, curl, ecode, emsg))
for is_ok, curl, ecode, emsg in results:
# FORMAT: {is_ok, grab, grab_config_backup, task, emsg}
curl_id = id(curl)
task = self.registry[curl_id]['task']
grab = self.registry[curl_id]['grab']
grab_config_backup =\
self.registry[curl_id]['grab_config_backup']
try:
grab.process_request_result()
except GrabTooManyRedirectsError:
ecode = ERROR_TOO_MANY_REFRESH_REDIRECTS
emsg = 'Too many meta refresh redirects'
is_ok = False
#except Exception as ex:
# logging.error('', exc_info=ex)
# ecode = ERROR_INTERNAL_GRAB_ERROR
# emsg = 'Internal grab error'
# is_ok = False
grab.doc.error_code = ecode
grab.doc.error_msg = emsg
# Free resources
del self.registry[curl_id]
grab.transport.curl = None
if is_ok:
error_abbr = None
else:
error_abbr = ERROR_ABBR.get(ecode, 'unknown-%d' % ecode)
yield {
'ok': is_ok,
'ecode': ecode,
'emsg': emsg,
'error_abbr': error_abbr,
'grab': grab,
'grab_config_backup': grab_config_backup,
'task': task
}
with self.sigint_handler.handle_sigint():
self.multi.remove_handle(curl)
curl.reset()
self.freelist.append(curl)
if not queued_messages:
break
def test_use_stderr(self):
handler = PycurlSigintHandler()
sys.stderr.write('FOO!')
with handler.record():
sys.stderr.write('BAR!')
