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# Define here the models for your spider middleware
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#
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# See documentation in:
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# https://docs.scrapy.org/en/latest/topics/spider-middleware.html
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from __future__ import annotations
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import json
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from typing import TYPE_CHECKING
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import redis
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from scrapy import signals, Spider
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from scrapy.exceptions import CloseSpider
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# useful for handling different item types with a single interface
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from itemadapter import ItemAdapter
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if TYPE_CHECKING:
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from scrapy.crawler import Crawler
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from scrapy import Request
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class ScienceArticleWosSpiderMiddleware:
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# Not all methods need to be defined. If a method is not defined,
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# scrapy acts as if the spider middleware does not modify the
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# passed objects.
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@classmethod
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def from_crawler(cls, crawler):
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# This method is used by Scrapy to create your spiders.
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s = cls()
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crawler.signals.connect(s.spider_opened, signal=signals.spider_opened)
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return s
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def process_spider_input(self, response, spider):
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# Called for each response that goes through the spider
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# middleware and into the spider.
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# Should return None or raise an exception.
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return None
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def process_spider_output(self, response, result, spider):
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# Called with the results returned from the Spider, after
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# it has processed the response.
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# Must return an iterable of Request, or item objects.
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for i in result:
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yield i
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def process_spider_exception(self, response, exception, spider):
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# Called when a spider or process_spider_input() method
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# (from other spider middleware) raises an exception.
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# Should return either None or an iterable of Request or item objects.
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pass
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async def process_start(self, start):
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# Called with an async iterator over the spider start() method or the
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# maching method of an earlier spider middleware.
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async for item_or_request in start:
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yield item_or_request
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def spider_opened(self, spider):
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spider.logger.info("Spider opened: %s" % spider.name)
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class ScienceArticleWosDownloaderMiddleware:
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# Not all methods need to be defined. If a method is not defined,
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# scrapy acts as if the downloader middleware does not modify the
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# passed objects.
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@classmethod
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def from_crawler(cls, crawler):
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# This method is used by Scrapy to create your spiders.
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s = cls()
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crawler.signals.connect(s.spider_opened, signal=signals.spider_opened)
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return s
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def process_request(self, request, spider):
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# Called for each request that goes through the downloader
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# middleware.
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# Must either:
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# - return None: continue processing this request
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# - or return a Response object
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# - or return a Request object
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# - or raise IgnoreRequest: process_exception() methods of
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# installed downloader middleware will be called
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return None
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def process_response(self, request, response, spider):
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# Called with the response returned from the downloader.
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# Must either;
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# - return a Response object
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# - return a Request object
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# - or raise IgnoreRequest
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return response
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def process_exception(self, request, exception, spider):
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# Called when a download handler or a process_request()
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# (from other downloader middleware) raises an exception.
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# Must either:
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# - return None: continue processing this exception
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# - return a Response object: stops process_exception() chain
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# - return a Request object: stops process_exception() chain
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pass
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def spider_opened(self, spider):
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spider.logger.info("Spider opened: %s" % spider.name)
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class WosStarterApiXkeyDownloaderMiddleware:
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"""
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https://api.clarivate.com/swagger-ui/?apikey=none&url=https%3A%2F%2Fdeveloper.clarivate.com%2Fapis%2Fwos-starter%2Fswagger
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"""
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async def process_request(self, request, spider):
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key_param = {
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'X-ApiKey': '53b8164e7543ccebe489988287e8b871bc2c0880'
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}
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request.headers.update(key_param)
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# return request
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class WosCookieMiddleware:
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def __init__(self, redis_uri: str):
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self.redis_cli = redis.from_url(redis_uri, decode_responses=True)
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self.redis_key_prefix = 'cookie_pool:wos_sid'
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self.cookiepool_cache_key = 'cookie_pool:wos:sid_q'
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@classmethod
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def from_crawler(cls, crawler: Crawler, *args, **kwargs):
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settings = crawler.settings
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middle = cls(
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redis_uri=settings.get("REDIS_URL")
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)
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crawler.signals.connect(middle.open_spider, signal=signals.spider_opened)
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crawler.signals.connect(middle.close_spider, signal=signals.spider_closed)
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return middle
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def open_spider(self, spider: Spider):
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self.loading_sid_from_redis()
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def close_spider(self, spider: Spider, reason: str = None):
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self.del_sid_from_redis()
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def process_request(self, request: Request, spider):
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req_wos_sid = request.meta.get('wos_sid')
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if not req_wos_sid:
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sid = self.get_sid_from_redis()
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if not sid:
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raise CloseSpider(f"没有获取到sid，即将退出")
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# 把获取到的wos_sid绑定到request，可以在parse方法中获取到wos_sid的值
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request.meta['wos_sid'] = sid
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else:
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sid = req_wos_sid
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cookie_1 = {'dotmatics.elementalKey': 'SLsLWlMhrHnTjDerSrlG'}
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headers = {
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'authority': 'webofscience.clarivate.cn',
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'accept-language': 'zh-CN,zh;q=0.9',
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'cache-control': 'no-cache',
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'origin': 'https://webofscience.clarivate.cn',
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'pragma': 'no-cache',
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# 'referer': 'https://webofscience.clarivate.cn/wos/woscc/advanced-search',
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}
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request.cookies = cookie_1
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if request.url.endswith('runQuerySearch'):
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# 检索时需要带有sid参数
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request._set_url(request.url + "?SID=%s" % sid)
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headers.update(
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{'accept': 'application/x-ndjson', 'content-type': 'text/plain;charset=UTF-8'})
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else:
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headers.update(
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{'accept': 'application/json, text/plain, */*', 'content-type': 'application/json',
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'x-1p-wos-sid': sid})
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for hk, hv in headers.items():
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request.headers[hk] = hv
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return None
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def process_response(self, request, response, spider):
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if response.status != 200:
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self.mark_sid_status(request.meta.get('wos_sid'))
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return response
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def get_sid_from_redis(self):
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val = self.redis_cli.rpoplpush(self.cookiepool_cache_key, self.cookiepool_cache_key)
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if val:
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self.inc_used_times(val)
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return val
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return None
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def inc_used_times(self, val: str = None):
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self.redis_cli.hincrby(f'{self.redis_key_prefix}:{val}', 'used_times', 1)
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def mark_sid_status(self, sid: str, status: str = 'validate'):
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"""
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:param sid:
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:param status: validate/expired
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:return:
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"""
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if status == "expired":
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# 过期直接删除key
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self.redis_cli.delete(f'{self.cookiepool_cache_key}:{sid}')
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else:
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self.redis_cli.hset(f'{self.redis_key_prefix}:{sid}', 'status', status)
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def loading_sid_from_redis(self) -> list:
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"""
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加载所有的sid到List结构，从缓存队列取sid
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:return:
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"""
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valid_sid = []
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keys = self.redis_cli.keys(f'{self.redis_key_prefix}:*')
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for key in keys:
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# 获取所有的信息
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key_obj: dict = self.redis_cli.hgetall(key)
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if key_obj.get("status") == "normal":
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real_sid = key.rsplit(':', maxsplit=1)[-1]
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valid_sid.append(real_sid)
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self.redis_cli.lpush(self.cookiepool_cache_key, real_sid)
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return valid_sid
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def del_sid_from_redis(self):
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self.redis_cli.delete(f'{self.cookiepool_cache_key}')
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class WosSessionMiddleware:
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def process_request(self, request: Request, spider: Spider):
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pass
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class A:
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def __init__(self, redis_cli):
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self.redis_cli = redis_cli
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def load_keys(self, name):
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return self.redis_cli.keys(r'cookie_pool:wos_sid:*')
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def get_one_sid(self, name):
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return self.redis_cli.rpoplpush(name)
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