Package: gerapy-redis
Gerapy RedisThis is a package for supporting distribution in Scrapy using Redis, also this
package is a module inGerapy.This package is almost copied fromhttps://github.com/rmax/scrapy-redis.ChangeRemoved RedisSpider, move the logic to Scheduler. It will pre enqueue
all start requests to Redis Queue instead of adding one start request
when crawler is idle.Arg:SCHEDULER_PRE_ENQUEUE_ALL_START_REQUESTS, default toTrue.Installationpip3installgerapy-redisUsage# Enables scheduling storing requests queue in redis.SCHEDULER="gerapy_redis.scheduler.Scheduler"# Ensure all spiders share same duplicates filter through redis.DUPEFILTER_CLASS="gerapy_redis.dupefilter.RFPDupeFilter"# Default requests serializer is pickle, but it can be changed to any module# with loads and dumps functions. Note that pickle is not compatible between# python versions.# Caveat: In python 3.x, the serializer must return strings keys and support# bytes as values. Because of this reason the json or msgpack module will not# work by default. In python 2.x there is no such issue and you can use# 'json' or 'msgpack' as serializers.#SCHEDULER_SERIALIZER = "gerapy_redis.picklecompat"# Don't cleanup redis queues, allows to pause/resume crawls.#SCHEDULER_PERSIST = True# Pre enqueue all start requests to queue, (default True)#SCHEDULER_PRE_ENQUEUE_ALL_START_REQUESTS = True# Schedule requests using a priority queue. (default)#SCHEDULER_QUEUE_CLASS = 'gerapy_redis.queue.PriorityQueue'# Alternative queues.#SCHEDULER_QUEUE_CLASS = 'gerapy_redis.queue.FifoQueue'#SCHEDULER_QUEUE_CLASS = 'gerapy_redis.queue.LifoQueue'# Max idle time to prevent the spider from being closed when distributed crawling.# This only works if queue class is SpiderQueue or SpiderStack,# and may also block the same time when your spider start at the first time (because the queue is empty).#SCHEDULER_IDLE_BEFORE_CLOSE = 10# Store scraped item in redis for post-processing.ITEM_PIPELINES={'gerapy_redis.pipelines.RedisPipeline':300}# The item pipeline serializes and stores the items in this redis key.#REDIS_ITEMS_KEY = '%(spider)s:items'# The items serializer is by default ScrapyJSONEncoder. You can use any# importable path to a callable object.#REDIS_ITEMS_SERIALIZER = 'json.dumps'# Specify the host and port to use when connecting to Redis (optional).#REDIS_HOST = 'localhost'#REDIS_PORT = 6379# Specify the full Redis URL for connecting (optional).# If set, this takes precedence over the REDIS_HOST and REDIS_PORT settings.#REDIS_URL = 'redis://user:pass@hostname:9001'# Custom redis client parameters (i.e.: socket timeout, etc.)#REDIS_PARAMS  = {}# Use custom redis client class.#REDIS_PARAMS['redis_cls'] = 'myproject.RedisClient'# If True, it uses redis' ``SPOP`` operation. You have to use the ``SADD``# command to add URLs to the redis queue. This could be useful if you# want to avoid duplicates in your start urls list and the order of# processing does not matter.#REDIS_START_URLS_AS_SET = False# If True, it uses redis ``zrevrange`` and ``zremrangebyrank`` operation. You have to use the ``zadd``# command to add URLS and Scores to redis queue. This could be useful if you# want to use priority and avoid duplicates in your start urls list.#REDIS_START_URLS_AS_ZSET = False# Default start urls key for RedisSpider and RedisCrawlSpider.#REDIS_START_URLS_KEY = '%(name)s:start_urls'# Use other encoding than utf-8 for redis.#REDIS_ENCODING = 'latin1'For more information, please refer tohttps://github.com/rmax/scrapy-redis.