def open(self, spider):
self.spider = spider
self.spider.set_logger(self.logger)
self.create_queues()
self.setup_zookeeper()
self.dupefilter = RFPDupeFilter(self.redis_conn,
self.spider.name + ':dupefilter',
self.rfp_timeout)
def open(self, spider):
self.spider = spider
self.spider.set_logger(self.logger)
self.create_queues()
self.setup_zookeeper()
self.dupefilter = RFPDupeFilter(self.redis_conn,
self.spider.name + ':dupefilter',
self.rfp_timeout)
self.global_page_per_domain_filter = RFGlobalPagePerDomainFilter(
self.redis_conn, self.spider.name + ':global_page_count_filter',
self.global_page_per_domain_limit,
self.global_page_per_domain_limit_timeout)
self.domain_max_page_filter = RFDomainMaxPageFilter(
self.redis_conn, self.spider.name + ':domain_max_page_filter',
self.domain_max_page_timeout)
def open(self, spider):
self.spider = spider
self.spider.set_logger(self.logger)
self.create_queues()
self.setup_zookeeper()
self.dupefilter = RFPDupeFilter(self.redis_conn,
self.spider.name + ':dupefilter',
self.rfp_timeout)
class TestRedisDupefilter(TestCase):
def setUp(self):
self.dupe = RFPDupeFilter(MagicMock(), 'key', 1)
def test_dupe_filter(self):
req = Request('http://example.com')
req.meta['crawlid'] = "abc123"
self.dupe.server.expire = MagicMock()
# successfully added
self.dupe.server.sadd = MagicMock(return_value=1)
self.assertFalse(self.dupe.request_seen(req))
# unsuccessfully added
self.dupe.server.sadd = MagicMock(return_value=0)
self.assertTrue(self.dupe.request_seen(req))
class DistributedScheduler(object):
'''
Scrapy request scheduler that utilizes Redis Throttled Priority Queues
to moderate different domain scrape requests within a distributed scrapy
cluster
'''
redis_conn = None # the redis connection
queue_dict = None # the dict of throttled queues
spider = None # the spider using this scheduler
queue_keys = None # the list of current queues
queue_class = None # the class to use for the queue
dupefilter = None # the redis dupefilter
update_time = 0 # the last time the queues were updated
update_ip_time = 0 # the last time the ip was updated
update_interval = 0 # how often to update the queues
extract = None # the tld extractor
hits = 0 # default number of hits for a queue
window = 0 # default window to calculate number of hits
my_ip = None # the ip address of the scheduler (if needed)
old_ip = None # the old ip for logging
ip_update_interval = 0 # the interval to update the ip address
add_type = None # add spider type to redis throttle queue key
add_ip = None # add spider public ip to redis throttle queue key
item_retries = 0 # the number of extra tries to get an item
my_uuid = None # the generated UUID for the particular scrapy process
# Zookeeper Dynamic Config Vars
domain_config = {} # The list of domains and their configs
my_id = None # The id used to read the throttle config
config_flag = False # Flag to reload queues if settings are wiped too
assign_path = None # The base assigned configuration path to read
zoo_client = None # The KazooClient to manage the config
my_assignment = None # Zookeeper path to read actual yml config
black_domains = [] # the domains to ignore thanks to zookeeper config
def __init__(self, server, persist, update_int, timeout, retries, logger,
hits, window, mod, ip_refresh, add_type, add_ip, ip_regex,
backlog_blacklist, queue_timeout):
'''
Initialize the scheduler
'''
self.redis_conn = server
self.persist = persist
self.queue_dict = {}
self.update_interval = update_int
self.hits = hits
self.window = window
self.moderated = mod
self.rfp_timeout = timeout
self.ip_update_interval = ip_refresh
self.add_type = add_type
self.add_ip = add_ip
self.item_retires = retries
self.logger = logger
self.ip_regex = re.compile(ip_regex)
self.backlog_blacklist = backlog_blacklist
self.queue_timeout = queue_timeout
# set up tldextract
self.extract = tldextract.TLDExtract()
self.update_ipaddress()
# if we need better uuid's mod this line
self.my_uuid = str(uuid.uuid4()).split('-')[4]
def setup_zookeeper(self):
self.assign_path = settings.get('ZOOKEEPER_ASSIGN_PATH', "")
self.my_id = settings.get('ZOOKEEPER_ID', 'all')
self.logger.debug("Trying to establish Zookeeper connection")
try:
self.zoo_watcher = ZookeeperWatcher(
hosts=settings.get('ZOOKEEPER_HOSTS'),
filepath=self.assign_path + self.my_id,
config_handler=self.change_config,
error_handler=self.error_config,
pointer=False, ensure=True, valid_init=True)
except KazooTimeoutError:
self.logger.error("Could not connect to Zookeeper")
sys.exit(1)
if self.zoo_watcher.ping():
self.logger.debug("Successfully set up Zookeeper connection")
else:
self.logger.error("Could not ping Zookeeper")
sys.exit(1)
def change_config(self, config_string):
if config_string and len(config_string) > 0:
loaded_config = yaml.safe_load(config_string)
self.logger.info("Zookeeper config changed", extra=loaded_config)
self.load_domain_config(loaded_config)
self.update_domain_queues()
elif config_string is None or len(config_string) == 0:
self.error_config("Zookeeper config wiped")
self.create_queues()
def load_domain_config(self, loaded_config):
'''
Loads the domain_config and sets up queue_dict
@param loaded_config: the yaml loaded config dict from zookeeper
'''
self.domain_config = {}
# vetting process to ensure correct configs
if loaded_config:
if 'domains' in loaded_config:
for domain in loaded_config['domains']:
item = loaded_config['domains'][domain]
# check valid
if 'window' in item and 'hits' in item:
self.logger.debug("Added domain {dom} to loaded config"
.format(dom=domain))
self.domain_config[domain] = item
if 'blacklist' in loaded_config:
self.black_domains = loaded_config['blacklist']
self.config_flag = True
def update_domain_queues(self):
'''
Check to update existing queues already in memory
new queues are created elsewhere
'''
for key in self.domain_config:
final_key = "{name}:{domain}:queue".format(
name=self.spider.name,
domain=key)
# we already have a throttled queue for this domain, update it to new settings
if final_key in self.queue_dict:
self.queue_dict[final_key][0].window = float(self.domain_config[key]['window'])
self.logger.debug("Updated queue {q} with new config"
.format(q=final_key))
# if scale is applied, scale back; otherwise use updated hits
if 'scale' in self.domain_config[key]:
# round to int
hits = int(self.domain_config[key]['hits'] * self.fit_scale(
self.domain_config[key]['scale']))
self.queue_dict[final_key][0].limit = float(hits)
else:
self.queue_dict[final_key][0].limit = float(self.domain_config[key]['hits'])
def error_config(self, message):
extras = {}
extras['message'] = message
extras['revert_window'] = self.window
extras['revert_hits'] = self.hits
extras['spiderid'] = self.spider.name
self.logger.info("Lost config from Zookeeper", extra=extras)
# lost connection to zookeeper, reverting back to defaults
for key in self.domain_config:
final_key = "{name}:{domain}:queue".format(
name=self.spider.name,
domain=key)
self.queue_dict[final_key][0].window = self.window
self.queue_dict[final_key][0].limit = self.hits
self.domain_config = {}
def fit_scale(self, scale):
'''
@return: a scale >= 0 and <= 1
'''
if scale >= 1:
return 1.0
elif scale <= 0:
return 0.0
else:
return scale
def create_queues(self):
'''
Updates the in memory list of the redis queues
Creates new throttled queue instances if it does not have them
'''
# new config could have loaded between scrapes
newConf = self.check_config()
self.queue_keys = self.redis_conn.keys(self.spider.name + ":*:queue")
for key in self.queue_keys:
# build final queue key, depending on type and ip bools
throttle_key = ""
if self.add_type:
throttle_key = self.spider.name + ":"
if self.add_ip:
throttle_key = throttle_key + self.my_ip + ":"
# add the tld from the key `type:tld:queue`
the_domain = re.split(':', key)[1]
throttle_key = throttle_key + the_domain
if key not in self.queue_dict or newConf:
self.logger.debug("Added new Throttled Queue {q}"
.format(q=key))
q = RedisPriorityQueue(self.redis_conn, key, encoding=ujson)
# use default window and hits
if the_domain not in self.domain_config:
# this is now a tuple, all access needs to use [0] to get
# the object, use [1] to get the time
self.queue_dict[key] = [RedisThrottledQueue(self.redis_conn,
q, self.window, self.hits, self.moderated, throttle_key,
throttle_key, True), time.time()]
# use custom window and hits
else:
window = self.domain_config[the_domain]['window']
hits = self.domain_config[the_domain]['hits']
# adjust the crawl rate based on the scale if exists
if 'scale' in self.domain_config[the_domain]:
hits = int(hits * self.fit_scale(self.domain_config[the_domain]['scale']))
self.queue_dict[key] = [RedisThrottledQueue(self.redis_conn,
q, window, hits, self.moderated, throttle_key,
throttle_key, True), time.time()]
def expire_queues(self):
'''
Expires old queue_dict keys that have not been used in a long time.
Prevents slow memory build up when crawling lots of different domains
'''
curr_time = time.time()
for key in list(self.queue_dict):
diff = curr_time - self.queue_dict[key][1]
if diff > self.queue_timeout:
self.logger.debug("Expiring domain queue key " + key)
del self.queue_dict[key]
if key in self.queue_keys:
self.queue_keys.remove(key)
def check_config(self):
'''
Controls configuration for the scheduler
@return: True if there is a new configuration
'''
if self.config_flag:
self.config_flag = False
return True
return False
def update_ipaddress(self):
'''
Updates the scheduler so it knows its own ip address
'''
# assign local ip in case of exception
self.old_ip = self.my_ip
self.my_ip = '127.0.0.1'
try:
obj = urllib.request.urlopen(settings.get('PUBLIC_IP_URL',
'http://ip.42.pl/raw'))
results = self.ip_regex.findall(obj.read())
if len(results) > 0:
self.my_ip = results[0]
else:
raise IOError("Could not get valid IP Address")
obj.close()
self.logger.debug("Current public ip: {ip}".format(ip=self.my_ip))
except IOError:
self.logger.error("Could not reach out to get public ip")
pass
if self.old_ip != self.my_ip:
self.logger.info("Changed Public IP: {old} -> {new}".format(
old=self.old_ip, new=self.my_ip))
def report_self(self):
'''
Reports the crawler uuid to redis
'''
self.logger.debug("Reporting self id", extra={'uuid':self.my_uuid})
key = "stats:crawler:{m}:{s}:{u}".format(
m=socket.gethostname(),
s=self.spider.name,
u=self.my_uuid)
self.redis_conn.set(key, time.time())
self.redis_conn.expire(key, self.ip_update_interval * 2)
@classmethod
def from_settings(cls, settings):
server = redis.Redis(host=settings.get('REDIS_HOST'),
port=settings.get('REDIS_PORT'),
db=settings.get('REDIS_DB'))
persist = settings.get('SCHEDULER_PERSIST', True)
up_int = settings.get('SCHEDULER_QUEUE_REFRESH', 10)
hits = settings.get('QUEUE_HITS', 10)
window = settings.get('QUEUE_WINDOW', 60)
mod = settings.get('QUEUE_MODERATED', False)
timeout = settings.get('DUPEFILTER_TIMEOUT', 600)
ip_refresh = settings.get('SCHEDULER_IP_REFRESH', 60)
add_type = settings.get('SCHEDULER_TYPE_ENABLED', False)
add_ip = settings.get('SCHEDULER_IP_ENABLED', False)
retries = settings.get('SCHEUDLER_ITEM_RETRIES', 3)
ip_regex = settings.get('IP_ADDR_REGEX', '.*')
backlog_blacklist = settings.get('SCHEDULER_BACKLOG_BLACKLIST', True)
queue_timeout = settings.get('SCHEDULER_QUEUE_TIMEOUT', 3600)
my_level = settings.get('SC_LOG_LEVEL', 'INFO')
my_name = settings.get('SC_LOGGER_NAME', 'sc-logger')
my_output = settings.get('SC_LOG_STDOUT', True)
my_json = settings.get('SC_LOG_JSON', False)
my_dir = settings.get('SC_LOG_DIR', 'logs')
my_bytes = settings.get('SC_LOG_MAX_BYTES', '10MB')
my_file = settings.get('SC_LOG_FILE', 'main.log')
my_backups = settings.get('SC_LOG_BACKUPS', 5)
logger = LogFactory.get_instance(json=my_json,
name=my_name,
stdout=my_output,
level=my_level,
dir=my_dir,
file=my_file,
bytes=my_bytes,
backups=my_backups)
return cls(server, persist, up_int, timeout, retries, logger, hits,
window, mod, ip_refresh, add_type, add_ip, ip_regex,
backlog_blacklist, queue_timeout)
@classmethod
def from_crawler(cls, crawler):
return cls.from_settings(crawler.settings)
def open(self, spider):
self.spider = spider
self.spider.set_logger(self.logger)
self.create_queues()
self.setup_zookeeper()
self.dupefilter = RFPDupeFilter(self.redis_conn,
self.spider.name + ':dupefilter',
self.rfp_timeout)
def close(self, reason):
self.logger.info("Closing Spider", {'spiderid':self.spider.name})
if not self.persist:
self.logger.warning("Clearing crawl queues")
self.dupefilter.clear()
for key in self.queue_keys:
self.queue_dict[key][0].clear()
def is_blacklisted(self, appid, crawlid):
'''
Checks the redis blacklist for crawls that should not be propagated
either from expiring or stopped
@return: True if the appid crawlid combo is blacklisted
'''
key_check = '{appid}||{crawlid}'.format(appid=appid,
crawlid=crawlid)
redis_key = self.spider.name + ":blacklist"
return self.redis_conn.sismember(redis_key, key_check)
def enqueue_request(self, request):
'''
Pushes a request from the spider into the proper throttled queue
'''
if not request.dont_filter and self.dupefilter.request_seen(request):
self.logger.debug("Request not added back to redis")
return
req_dict = self.request_to_dict(request)
if not self.is_blacklisted(req_dict['meta']['appid'],
req_dict['meta']['crawlid']):
# grab the tld of the request
ex_res = self.extract(req_dict['url'])
key = "{sid}:{dom}.{suf}:queue".format(
sid=req_dict['meta']['spiderid'],
dom=ex_res.domain,
suf=ex_res.suffix)
curr_time = time.time()
domain = "{d}.{s}".format(d=ex_res.domain, s=ex_res.suffix)
# allow only if we want all requests or we want
# everything but blacklisted domains
# insert if crawl never expires (0) or time < expires
if (self.backlog_blacklist or
(not self.backlog_blacklist and
domain not in self.black_domains)) and \
(req_dict['meta']['expires'] == 0 or
curr_time < req_dict['meta']['expires']):
# we may already have the queue in memory
if key in self.queue_keys:
self.queue_dict[key][0].push(req_dict,
req_dict['meta']['priority'])
else:
# shoving into a new redis queue, negative b/c of sorted sets
# this will populate ourself and other schedulers when
# they call create_queues
self.redis_conn.zadd(key, ujson.dumps(req_dict),
-req_dict['meta']['priority'])
self.logger.debug("Crawlid: '{id}' Appid: '{appid}' added to queue"
.format(appid=req_dict['meta']['appid'],
id=req_dict['meta']['crawlid']))
else:
self.logger.debug("Crawlid: '{id}' Appid: '{appid}' expired"
.format(appid=req_dict['meta']['appid'],
id=req_dict['meta']['crawlid']))
else:
self.logger.debug("Crawlid: '{id}' Appid: '{appid}' blacklisted"
.format(appid=req_dict['meta']['appid'],
id=req_dict['meta']['crawlid']))
def request_to_dict(self, request):
'''
Convert Request object to a dict.
modified from scrapy.utils.reqser
'''
req_dict = {
# urls should be safe (safe_string_url)
'url': to_unicode(request.url),
'method': request.method,
'headers': dict(request.headers),
'body': request.body,
'cookies': request.cookies,
'meta': request.meta,
'_encoding': request._encoding,
'priority': request.priority,
'dont_filter': request.dont_filter,
# callback/errback are assumed to be a bound instance of the spider
'callback': None if request.callback is None else request.callback.__name__,
'errback': None if request.errback is None else request.errback.__name__,
}
return req_dict
def find_item(self):
'''
Finds an item from the throttled queues
'''
random.shuffle(self.queue_keys)
count = 0
while count <= self.item_retries:
for key in self.queue_keys:
# skip if the whole domain has been blacklisted in zookeeper
if key.split(':')[1] in self.black_domains:
continue
# the throttled queue only returns an item if it is allowed
item = self.queue_dict[key][0].pop()
if item:
# update timeout and return
self.queue_dict[key][1] = time.time()
return item
count = count + 1
return None
def next_request(self):
'''
Logic to handle getting a new url request, from a bunch of
different queues
'''
t = time.time()
# update the redis queues every so often
if t - self.update_time > self.update_interval:
self.update_time = t
self.create_queues()
self.expire_queues()
# update the ip address every so often
if t - self.update_ip_time > self.ip_update_interval:
self.update_ip_time = t
self.update_ipaddress()
self.report_self()
item = self.find_item()
if item:
self.logger.debug("Found url to crawl {url}" \
.format(url=item['url']))
try:
req = Request(item['url'])
except ValueError:
# need absolute url
# need better url validation here
req = Request('http://' + item['url'])
try:
if 'callback' in item and item['callback'] is not None:
req.callback = getattr(self.spider, item['callback'])
except AttributeError:
self.logger.warn("Unable to find callback method")
try:
if 'errback' in item and item['errback'] is not None:
req.errback = getattr(self.spider, item['errback'])
except AttributeError:
self.logger.warn("Unable to find errback method")
if 'meta' in item:
item = item['meta']
# defaults not in schema
if 'curdepth' not in item:
item['curdepth'] = 0
if "retry_times" not in item:
item['retry_times'] = 0
for key in list(item.keys()):
req.meta[key] = item[key]
# extra check to add items to request
if 'useragent' in item and item['useragent'] is not None:
req.headers['User-Agent'] = item['useragent']
if 'cookie' in item and item['cookie'] is not None:
if isinstance(item['cookie'], dict):
req.cookies = item['cookie']
elif isinstance(item['cookie'], basestring):
req.cookies = self.parse_cookie(item['cookie'])
return req
return None
def parse_cookie(self, string):
'''
Parses a cookie string like returned in a Set-Cookie header
@param string: The cookie string
@return: the cookie dict
'''
results = re.findall('([^=]+)=([^\;]+);?\s?', string)
my_dict = {}
for item in results:
my_dict[item[0]] = item[1]
return my_dict
def has_pending_requests(self):
'''
We never want to say we have pending requests
If this returns True scrapy sometimes hangs.
'''
return False
class DistributedScheduler(object):
'''
Scrapy request scheduler that utilizes Redis Throttled Priority Queues
to moderate different domain scrape requests within a distributed scrapy
cluster
'''
redis_conn = None # the redis connection
queue_dict = None # the dict of throttled queues
spider = None # the spider using this scheduler
queue_keys = None # the list of current queues
queue_class = None # the class to use for the queue
dupefilter = None # the redis dupefilter
update_time = 0 # the last time the queues were updated
update_ip_time = 0 # the last time the ip was updated
update_interval = 0 # how often to update the queues
extract = None # the tld extractor
hits = 0 # default number of hits for a queue
window = 0 # default window to calculate number of hits
my_ip = None # the ip address of the scheduler (if needed)
old_ip = None # the old ip for logging
ip_update_interval = 0 # the interval to update the ip address
add_type = None # add spider type to redis throttle queue key
add_ip = None # add spider public ip to redis throttle queue key
item_retries = 0 # the number of extra tries to get an item
my_uuid = None # the generated UUID for the particular scrapy process
# Zookeeper Dynamic Config Vars
domain_config = {} # The list of domains and their configs
my_id = None # The id used to read the throttle config
config_flag = False # Flag to reload queues if settings are wiped too
assign_path = None # The base assigned configuration path to read
zoo_client = None # The KazooClient to manage the config
my_assignment = None # Zookeeper path to read actual yml config
black_domains = [] # the domains to ignore thanks to zookeeper config
def __init__(self, server, persist, update_int, timeout, retries, logger,
hits, window, mod, ip_refresh, add_type, add_ip, ip_regex,
backlog_blacklist, queue_timeout):
'''
Initialize the scheduler
'''
self.redis_conn = server
self.persist = persist
self.queue_dict = {}
self.update_interval = update_int
self.hits = hits
self.window = window
self.moderated = mod
self.rfp_timeout = timeout
self.ip_update_interval = ip_refresh
self.add_type = add_type
self.add_ip = add_ip
self.item_retires = retries
self.logger = logger
self.ip_regex = re.compile(ip_regex)
self.backlog_blacklist = backlog_blacklist
self.queue_timeout = queue_timeout
# set up tldextract
self.extract = tldextract.TLDExtract()
self.update_ipaddress()
# if we need better uuid's mod this line
self.my_uuid = str(uuid.uuid4()).split('-')[4]
def setup_zookeeper(self):
self.assign_path = settings.get('ZOOKEEPER_ASSIGN_PATH', "")
self.my_id = settings.get('ZOOKEEPER_ID', 'all')
self.logger.debug("Trying to establish Zookeeper connection")
try:
self.zoo_watcher = ZookeeperWatcher(
hosts=settings.get('ZOOKEEPER_HOSTS'),
filepath=self.assign_path + self.my_id,
config_handler=self.change_config,
error_handler=self.error_config,
pointer=False,
ensure=True,
valid_init=True)
except KazooTimeoutError:
self.logger.error("Could not connect to Zookeeper")
sys.exit(1)
if self.zoo_watcher.ping():
self.logger.debug("Successfully set up Zookeeper connection")
else:
self.logger.error("Could not ping Zookeeper")
sys.exit(1)
def change_config(self, config_string):
if config_string and len(config_string) > 0:
loaded_config = yaml.safe_load(config_string)
self.logger.info("Zookeeper config changed", extra=loaded_config)
self.load_domain_config(loaded_config)
self.update_domain_queues()
elif config_string is None or len(config_string) == 0:
self.error_config("Zookeeper config wiped")
self.create_queues()
def load_domain_config(self, loaded_config):
'''
Loads the domain_config and sets up queue_dict
@param loaded_config: the yaml loaded config dict from zookeeper
'''
self.domain_config = {}
# vetting process to ensure correct configs
if loaded_config:
if 'domains' in loaded_config:
for domain in loaded_config['domains']:
item = loaded_config['domains'][domain]
# check valid
if 'window' in item and 'hits' in item:
self.logger.debug(
"Added domain {dom} to loaded config".format(
dom=domain))
self.domain_config[domain] = item
if 'blacklist' in loaded_config:
self.black_domains = loaded_config['blacklist']
self.config_flag = True
def update_domain_queues(self):
'''
Check to update existing queues already in memory
new queues are created elsewhere
'''
for key in self.domain_config:
final_key = "{name}:{domain}:queue".format(name=self.spider.name,
domain=key)
# we already have a throttled queue for this domain, update it to new settings
if final_key in self.queue_dict:
self.queue_dict[final_key][0].window = float(
self.domain_config[key]['window'])
self.logger.debug(
"Updated queue {q} with new config".format(q=final_key))
# if scale is applied, scale back; otherwise use updated hits
if 'scale' in self.domain_config[key]:
# round to int
hits = int(
self.domain_config[key]['hits'] *
self.fit_scale(self.domain_config[key]['scale']))
self.queue_dict[final_key][0].limit = float(hits)
else:
self.queue_dict[final_key][0].limit = float(
self.domain_config[key]['hits'])
def error_config(self, message):
extras = {}
extras['message'] = message
extras['revert_window'] = self.window
extras['revert_hits'] = self.hits
extras['spiderid'] = self.spider.name
self.logger.info("Lost config from Zookeeper", extra=extras)
# lost connection to zookeeper, reverting back to defaults
for key in self.domain_config:
final_key = "{name}:{domain}:queue".format(name=self.spider.name,
domain=key)
self.queue_dict[final_key][0].window = self.window
self.queue_dict[final_key][0].limit = self.hits
self.domain_config = {}
def fit_scale(self, scale):
'''
@return: a scale >= 0 and <= 1
'''
if scale >= 1:
return 1.0
elif scale <= 0:
return 0.0
else:
return scale
def create_queues(self):
'''
Updates the in memory list of the redis queues
Creates new throttled queue instances if it does not have them
'''
# new config could have loaded between scrapes
newConf = self.check_config()
self.queue_keys = self.redis_conn.keys(self.spider.name + ":*:queue")
for key in self.queue_keys:
# build final queue key, depending on type and ip bools
throttle_key = ""
if self.add_type:
throttle_key = self.spider.name + ":"
if self.add_ip:
throttle_key = throttle_key + self.my_ip + ":"
# add the tld from the key `type:tld:queue`
the_domain = re.split(':', key)[1]
throttle_key = throttle_key + the_domain
if key not in self.queue_dict or newConf:
self.logger.debug(
"Added new Throttled Queue {q}".format(q=key))
q = RedisPriorityQueue(self.redis_conn, key, encoding=ujson)
# use default window and hits
if the_domain not in self.domain_config:
# this is now a tuple, all access needs to use [0] to get
# the object, use [1] to get the time
self.queue_dict[key] = [
RedisThrottledQueue(self.redis_conn, q, self.window,
self.hits, self.moderated,
throttle_key, throttle_key, True),
time.time()
]
# use custom window and hits
else:
window = self.domain_config[the_domain]['window']
hits = self.domain_config[the_domain]['hits']
# adjust the crawl rate based on the scale if exists
if 'scale' in self.domain_config[the_domain]:
hits = int(hits * self.fit_scale(
self.domain_config[the_domain]['scale']))
self.queue_dict[key] = [
RedisThrottledQueue(self.redis_conn, q, window, hits,
self.moderated, throttle_key,
throttle_key, True),
time.time()
]
def expire_queues(self):
'''
Expires old queue_dict keys that have not been used in a long time.
Prevents slow memory build up when crawling lots of different domains
'''
curr_time = time.time()
for key in list(self.queue_dict):
diff = curr_time - self.queue_dict[key][1]
if diff > self.queue_timeout:
self.logger.debug("Expiring domain queue key " + key)
del self.queue_dict[key]
if key in self.queue_keys:
self.queue_keys.remove(key)
def check_config(self):
'''
Controls configuration for the scheduler
@return: True if there is a new configuration
'''
if self.config_flag:
self.config_flag = False
return True
return False
def update_ipaddress(self):
'''
Updates the scheduler so it knows its own ip address
'''
# assign local ip in case of exception
self.old_ip = self.my_ip
self.my_ip = '127.0.0.1'
try:
obj = urllib.request.urlopen(
settings.get('PUBLIC_IP_URL', 'http://ip.42.pl/raw'))
results = self.ip_regex.findall(obj.read())
if len(results) > 0:
self.my_ip = results[0]
else:
raise IOError("Could not get valid IP Address")
obj.close()
self.logger.debug("Current public ip: {ip}".format(ip=self.my_ip))
except IOError as e:
self.logger.error(str(e))
self.logger.error("Could not reach out to get public ip")
pass
if self.old_ip != self.my_ip:
self.logger.info("Changed Public IP: {old} -> {new}".format(
old=self.old_ip, new=self.my_ip))
def report_self(self):
'''
Reports the crawler uuid to redis
'''
self.logger.debug("Reporting self id", extra={'uuid': self.my_uuid})
key = "stats:crawler:{m}:{s}:{u}".format(m=socket.gethostname(),
s=self.spider.name,
u=self.my_uuid)
self.redis_conn.set(key, time.time())
self.redis_conn.expire(key, self.ip_update_interval * 2)
@classmethod
def from_settings(cls, settings):
server = redis.Redis(host=settings.get('REDIS_HOST'),
port=settings.get('REDIS_PORT'),
db=settings.get('REDIS_DB'))
persist = settings.get('SCHEDULER_PERSIST', True)
up_int = settings.get('SCHEDULER_QUEUE_REFRESH', 10)
hits = settings.get('QUEUE_HITS', 10)
window = settings.get('QUEUE_WINDOW', 60)
mod = settings.get('QUEUE_MODERATED', False)
timeout = settings.get('DUPEFILTER_TIMEOUT', 600)
ip_refresh = settings.get('SCHEDULER_IP_REFRESH', 60)
add_type = settings.get('SCHEDULER_TYPE_ENABLED', False)
add_ip = settings.get('SCHEDULER_IP_ENABLED', False)
retries = settings.get('SCHEUDLER_ITEM_RETRIES', 3)
ip_regex = settings.get('IP_ADDR_REGEX', '.*')
backlog_blacklist = settings.get('SCHEDULER_BACKLOG_BLACKLIST', True)
queue_timeout = settings.get('SCHEDULER_QUEUE_TIMEOUT', 3600)
my_level = settings.get('SC_LOG_LEVEL', 'INFO')
my_name = settings.get('SC_LOGGER_NAME', 'sc-logger')
my_output = settings.get('SC_LOG_STDOUT', True)
my_json = settings.get('SC_LOG_JSON', False)
my_dir = settings.get('SC_LOG_DIR', 'logs')
my_bytes = settings.get('SC_LOG_MAX_BYTES', '10MB')
my_file = settings.get('SC_LOG_FILE', 'main.log')
my_backups = settings.get('SC_LOG_BACKUPS', 5)
logger = LogFactory.get_instance(json=my_json,
name=my_name,
stdout=my_output,
level=my_level,
dir=my_dir,
file=my_file,
bytes=my_bytes,
backups=my_backups)
return cls(server, persist, up_int, timeout, retries, logger, hits,
window, mod, ip_refresh, add_type, add_ip, ip_regex,
backlog_blacklist, queue_timeout)
@classmethod
def from_crawler(cls, crawler):
return cls.from_settings(crawler.settings)
def open(self, spider):
self.spider = spider
self.spider.set_logger(self.logger)
self.create_queues()
self.setup_zookeeper()
self.dupefilter = RFPDupeFilter(self.redis_conn,
self.spider.name + ':dupefilter',
self.rfp_timeout)
def close(self, reason):
self.logger.info("Closing Spider", {'spiderid': self.spider.name})
if not self.persist:
self.logger.warning("Clearing crawl queues")
self.dupefilter.clear()
for key in self.queue_keys:
self.queue_dict[key][0].clear()
def is_blacklisted(self, appid, crawlid):
'''
Checks the redis blacklist for crawls that should not be propagated
either from expiring or stopped
@return: True if the appid crawlid combo is blacklisted
'''
key_check = '{appid}||{crawlid}'.format(appid=appid, crawlid=crawlid)
redis_key = self.spider.name + ":blacklist"
return self.redis_conn.sismember(redis_key, key_check)
def enqueue_request(self, request):
'''
Pushes a request from the spider into the proper throttled queue
'''
if not request.dont_filter and self.dupefilter.request_seen(request):
self.logger.debug("Request not added back to redis")
return
req_dict = self.request_to_dict(request)
if not self.is_blacklisted(req_dict['meta']['appid'],
req_dict['meta']['crawlid']):
# grab the tld of the request
ex_res = self.extract(req_dict['url'])
key = "{sid}:{dom}.{suf}:queue".format(
sid=req_dict['meta']['spiderid'],
dom=ex_res.domain,
suf=ex_res.suffix)
curr_time = time.time()
domain = "{d}.{s}".format(d=ex_res.domain, s=ex_res.suffix)
# allow only if we want all requests or we want
# everything but blacklisted domains
# insert if crawl never expires (0) or time < expires
if (self.backlog_blacklist or
(not self.backlog_blacklist and
domain not in self.black_domains)) and \
(req_dict['meta']['expires'] == 0 or
curr_time < req_dict['meta']['expires']):
# we may already have the queue in memory
if key in self.queue_keys:
self.queue_dict[key][0].push(req_dict,
req_dict['meta']['priority'])
else:
# shoving into a new redis queue, negative b/c of sorted sets
# this will populate ourself and other schedulers when
# they call create_queues
self.redis_conn.zadd(key, ujson.dumps(req_dict),
-req_dict['meta']['priority'])
self.logger.debug(
"Crawlid: '{id}' Appid: '{appid}' URL: '{url}' added to queue"
.format(appid=req_dict['meta']['appid'],
id=req_dict['meta']['crawlid'],
url=req_dict['url']))
else:
self.logger.debug(
"Crawlid: '{id}' Appid: '{appid}' expired".format(
appid=req_dict['meta']['appid'],
id=req_dict['meta']['crawlid']))
else:
self.logger.debug(
"Crawlid: '{id}' Appid: '{appid}' blacklisted".format(
appid=req_dict['meta']['appid'],
id=req_dict['meta']['crawlid']))
def request_to_dict(self, request):
'''
Convert Request object to a dict.
modified from scrapy.utils.reqser
'''
req_dict = {
# urls should be safe (safe_string_url)
'url':
to_unicode(request.url),
'method':
request.method,
'headers':
dict(request.headers),
'body':
request.body,
'cookies':
request.cookies,
'meta':
request.meta,
'_encoding':
request._encoding,
'priority':
request.priority,
'dont_filter':
request.dont_filter,
# callback/errback are assumed to be a bound instance of the spider
'callback':
None if request.callback is None else request.callback.__name__,
'errback':
None if request.errback is None else request.errback.__name__,
}
return req_dict
def find_item(self):
'''
Finds an item from the throttled queues
'''
random.shuffle(self.queue_keys)
count = 0
while count <= self.item_retries:
for key in self.queue_keys:
# skip if the whole domain has been blacklisted in zookeeper
if key.split(':')[1] in self.black_domains:
continue
# the throttled queue only returns an item if it is allowed
item = self.queue_dict[key][0].pop()
if item:
# update timeout and return
self.queue_dict[key][1] = time.time()
return item
count = count + 1
return None
def next_request(self):
'''
Logic to handle getting a new url request, from a bunch of
different queues
'''
t = time.time()
# update the redis queues every so often
if t - self.update_time > self.update_interval:
self.update_time = t
self.create_queues()
self.expire_queues()
# update the ip address every so often
if t - self.update_ip_time > self.ip_update_interval:
self.update_ip_time = t
self.update_ipaddress()
self.report_self()
item = self.find_item()
if item:
self.logger.debug("Found url to crawl {url}" \
.format(url=item['url']))
try:
req = Request(item['url'])
except ValueError:
# need absolute url
# need better url validation here
req = Request('http://' + item['url'])
try:
if 'callback' in item and item['callback'] is not None:
req.callback = getattr(self.spider, item['callback'])
except AttributeError:
self.logger.warn("Unable to find callback method")
try:
if 'errback' in item and item['errback'] is not None:
req.errback = getattr(self.spider, item['errback'])
except AttributeError:
self.logger.warn("Unable to find errback method")
if 'meta' in item:
item = item['meta']
# defaults not in schema
if 'curdepth' not in item:
item['curdepth'] = 0
if "retry_times" not in item:
item['retry_times'] = 0
for key in list(item.keys()):
req.meta[key] = item[key]
# extra check to add items to request
if 'useragent' in item and item['useragent'] is not None:
req.headers['User-Agent'] = item['useragent']
if 'cookie' in item and item['cookie'] is not None:
if isinstance(item['cookie'], dict):
req.cookies = item['cookie']
elif isinstance(item['cookie'], basestring):
req.cookies = self.parse_cookie(item['cookie'])
return req
return None
def parse_cookie(self, string):
'''
Parses a cookie string like returned in a Set-Cookie header
@param string: The cookie string
@return: the cookie dict
'''
results = re.findall('([^=]+)=([^\;]+);?\s?', string)
my_dict = {}
for item in results:
my_dict[item[0]] = item[1]
return my_dict
def has_pending_requests(self):
'''
We never want to say we have pending requests
If this returns True scrapy sometimes hangs.
'''
return False
def setUp(self):
self.dupe = RFPDupeFilter(MagicMock(), 'key', 1)
