def start_requests(self):
if not self.max_page:
self.max_page = 1
page = 0
while page < self.max_page:
page += 1
for i in range(len(self.start_urls)):
url = self.start_urls[i]
url = url.format(page=page)
log.info(f'爬取第 {i+1}/{len(self.start_urls)} 个地址，第 {page}/{self.max_page} 页,{url}')
yield scrapy.Request(url=url)
def process_request(self, request, spider):
"""处理请求"""
if self.use_unique_proxy:
if not self.unique_proxy:
self.unique_proxy = proxy_manager.get()
log.info(f'use unique proxy {self.unique_proxy}')
proxy = self.unique_proxy
else:
proxy = proxy_manager.get()
log.info(f'use random proxy {proxy}')
request.meta["proxy"] = str(proxy)
def fail(self, proxy: ProxyItem):
"""失败时调用"""
# 添加失败次数
self._execute(self._sql_add_times, proxy, key='fail_times')
# 获取失败次数
sql = self._sql_get_fail_times_by_ip.format(**proxy)
record = asyncio.get_event_loop().run_until_complete(self.manager.conn.fetchrow(sql))
if record:
fail_times = record['fail_times']
if fail_times and fail_times >= 5:
# 大于 10 次，置为不可用
log.info(f'{proxy} fail set available=0')
self._execute(self._sql_update_fail, proxy)
else:
log.info(f'{proxy} fail set fail_times={fail_times}')
def filter_proxy_list(self, proxy_list):
"""过滤并保存代理"""
log.info(f'抓取 {self.name} 共 {len(proxy_list)} 个代理，校验有效性')
# 设置名字
for proxy in proxy_list:
proxy['source_domain'] = self.name
# 每次都新建，各自过滤各自保存
proxy_filter = self.get_proxy_filter(proxy_list)
if proxy_filter is not None:
available_proxy_list = proxy_filter.filter()
else:
available_proxy_list = proxy_list
log.info(f'{self.name} 共 {len(available_proxy_list)}/{len(proxy_list)} 个代理有效')
return available_proxy_list
def validate_response(self, proxy, result) -> bool:
"""从爬取代理的过程中，因为直接爬了抖音，所以解析数据"""
status_code = result['status_code']
if status_code == 0:
aweme_list = result['aweme_list']
proxy['available'] = 1
log.info(f'{proxy}-代理有效，爬到 {len(aweme_list)} items')
for aweme in aweme_list:
item = DouyinItem(aweme)
self.items.append(item)
return True
elif status_code == 2154:
proxy['available'] = 2
proxy['banned_time'] = time.time()
log.info(f"{proxy}-代理有效，但已被禁{result['status_code']}")
return True
else:
print(f"{proxy}-代理无效，返回状态码{result['status_code']}")
return False
def start_requests(self):
if not self.max_page:
self.max_page = 1
keyword_length = len(self.keyword_list)
for i in range(keyword_length):
self.keyword = self.keyword_list[i]
page = 0
while page < self.max_page:
page += 1
url_length = len(self.start_urls)
for j in range(url_length):
url = self.start_urls[j]
url = url.format(keyword=urllib.parse.quote(self.keyword),
page=page)
log.info(
f'爬取关键字{i + 1}/{keyword_length},地址{j + 1}/{url_length},页数{page}/{self.max_page},'
f'{url}')
yield scrapy.Request(url=url)
def start_requests(self):
self.statistics.start_time = time.time()
i = 0
self.statistics.start_craw_count = self.manager.count()
log.info(f'爬取前 item 数量 {self.statistics.start_craw_count}')
while i < 1:
# i += 1
if not ANONYMOUS:
log.info(f'sleep {self.sleep_time}')
time.sleep(self.sleep_time)
self.sleep_time = 1
# 并发的时候，time 是相同的，被 scrapy 认为是相同地址而忽略
# 后来发现要设置 dont_filter
anonymous = ANONYMOUS
url = douyin.generate_feed_url('http', anonymous)
headers = douyin.generate_headers(anonymous)
cookies = douyin.generate_cookies(anonymous)
self.statistics.crawled_pages += 1
log.info(f'crawl {self.statistics.crawled_pages} page:' + url)
yield scrapy.Request(url=url,
headers=headers,
cookies=cookies,
dont_filter=True)
if self.has_more == 0 or self.exit_code == 0:
break
def banned(self, proxy: ProxyItem):
"""被禁时调用"""
log.info(f'{proxy} banned')
self._execute(self._sql_update_banned, proxy)
def success(self, proxy: ProxyItem):
"""成功时调用"""
log.info(f'{proxy} success')
self._execute(self._sql_update_success, proxy)
def save_items(self):
log.info(f'共爬取到 {len(self.items)} items，保存中')
for item in self.items:
self.pipeline.process_item(item, None)
self.items.clear()
self.pipeline.close_spider(None)
def parse(self, response):
try:
body = response.body.decode()
if body == 'error':
print('body 为 error，异常已拦截')
return
result = json.loads(body)
status_code = result['status_code']
if result['status_code'] == 0:
self.has_more = result['has_more']
aweme_list = result['aweme_list']
# 之前的数量
before_item_count = self.manager.count()
for aweme in aweme_list:
item = DouyinItem(aweme)
yield item
# 保存后再统计
# 之后的数量
current_item_count = self.manager.count()
self.statistics.crawled_success__pages += 1
self.statistics.crawled_items += len(aweme_list)
minute = (time.time() - self.statistics.start_time) / 60
available_count = current_item_count - before_item_count
if available_count <= 2:
# 获取数量较小，需要等待
if self.statistics.few_available_result_times >= 5:
self.statistics.few_available_result_times = 0
log.info('有 5 次抓取到的有效结果都较少，等待 600 s')
self.sleep_time = 600
else:
self.statistics.few_available_result_times += 1
log.info('抓取到的有效结果较少，等待 60s')
self.sleep_time = 60
else:
self.statistics.few_available_result_times = 0
log.info(
f'scraped {len(aweme_list)} items,available {available_count} items.'
)
speed = self.statistics.crawled_items / minute
log.info(
f'scraped {self.statistics.crawled_success__pages}/{self.statistics.crawled_pages} pages,'
f'{current_item_count - self.statistics.start_craw_count}/{self.statistics.crawled_items} items,'
f'spend {self.parse_time(minute)},speed {speed:#.2f} items/min.'
)
elif status_code == 2145:
log.warning('请求已过期')
self.exit_code = 0
elif status_code == 2151:
log.warning('签名错误')
self.exit_code = 0
elif status_code == 2154:
# 大约会被禁 1 个小时
log.warning('请求太频繁，设备被禁')
if ANONYMOUS:
# 已经在下载器中间件拦截，应该不会走到这里的
pass
else:
# 不匿名需要处理
log.warning('休息 10 分钟')
self.sleep_time = 10 * 60
# 仅休眠，不退出
# self.exit_code = 0
else:
log.warning('错误码 %d' % status_code)
log.warning(response.body.decode())
self.exit_code = 0
except Exception as e:
# TODO 这里要解析代理出错，或者在中间件里处理
log.error('出错了')
log.error(repr(e))
def crawl_in_loop(self, runner):
"""在循环中爬取"""
# 遍历取出 spider
spider_list = []
for spider_class in iter_spider_classes(regex_proxy_spider):
ip_count = getattr(spider_class, 'ip_count', 0)
if ip_count > 0:
spider_list.append(spider_class)
all_loop = ProxyCounter()
single_loop = ProxyCounter()
# 开始时起动，每轮结束后计数
all_loop.start()
# 无限循环
loop_times = 0
while loop_times >= 0:
loop_times += 1
# 每轮开始时启动，每个爬虫结束时计数
single_loop.start()
while single_loop.available.start_num > 100:
print(f'有效 ip {single_loop.available.start_num} 个，休息 10 分钟')
time.sleep(60 * 10)
single_loop.start()
# 开始时的数量
log.info(f'第 {loop_times} 轮爬取开始')
# 爬取
for i in range(len(spider_list)):
spider = spider_list[i]
log.info(
f'第 {loop_times} 轮,第 {i + 1}/{len(spider_list)} 个爬虫 {spider.name} 开始爬取,'
f'{single_loop.print_count()}')
spider = spider_list[i]
try:
yield runner.crawl(spider)
except SystemExit:
pass
sleep_time = 10
divider = '-' * 10
single_loop.count()
log.info(
f'{divider}第 {loop_times} 轮,第 {i + 1}/{len(spider_list)} 个爬虫 {spider.name} 爬取结束,'
f'{single_loop.print_count()} {divider}')
log.info(f'等待执行下一爬虫,sleep {sleep_time}')
time.sleep(sleep_time)
# 延时下一轮
sleep_time = 60
log.info(f'本轮爬取结束，等待下一轮,sleep {sleep_time}')
all_loop.count()
log.info(all_loop.print_count())
time.sleep(sleep_time)
# noinspection PyUnresolvedReferences
reactor.stop()
def process_request(self, request, spider):
proxy = proxy_manager.get()
log.info(f'use random proxy {proxy}')
request.meta["proxy"] = str(proxy)
def crawl_in_loop(self, runner):
"""在循环中爬取"""
# 遍历取出 spider
spider_list = []
for spider_class in iter_spider_classes(regex_proxy_spider):
ip_count = getattr(spider_class, 'ip_count', 0)
if ip_count > 0:
spider_list.append(spider_class)
loop_times = 0
loop_end_count = 0
all_loop_proxy_count = 0
"""整个循环中爬取的代理总数"""
# 无限循环
while loop_times >= 0:
loop_times += 1
# 开始时的数量
if loop_end_count == 0:
# 首次获取
loop_start_count = proxy_manager.count()
else:
# 取循环结束时的获取
loop_start_count = loop_end_count
log.info(f'第 {loop_times} 轮爬取开始，当前 ip 共 {loop_start_count} 个')
# 爬取
spider_end_count = 0
for i in range(len(spider_list)):
spider = spider_list[i]
if spider_end_count == 0:
spider_start_count = loop_start_count
else:
spider_start_count = spider_end_count
log.info(
f'第 {loop_times} 轮,第 {i+1}/{len(spider_list)} 个爬虫 {spider.name} 开始爬取,'
f'当前 ip 共 {spider_start_count} 个')
spider = spider_list[i]
try:
yield runner.crawl(spider)
except SystemExit:
pass
sleep_time = 10
spider_end_count = proxy_manager.count()
spider_crawled_count = spider_end_count - spider_start_count
loop_crawled_count = spider_end_count - loop_start_count
# 单次循环爬取到的数量
all_loop_proxy_count += loop_crawled_count
divider = '-' * 10
log.info(
f'{divider}第 {loop_times} 轮,第 {i+1}/{len(spider_list)} 个爬虫 {spider.name} 爬取结束,'
f'共爬取到 {spider_crawled_count}/{loop_crawled_count}/{all_loop_proxy_count} 个代理{divider}'
)
log.info(f'等待执行下一爬虫,sleep {sleep_time}')
log.info(f'当前有效代理共 {proxy_manager.available_count()} 个')
time.sleep(sleep_time)
# 结束时的数量
loop_end_count = proxy_manager.count()
# 延时下一轮
sleep_time = 60
log.info(
f'本轮共爬到 {loop_end_count-loop_start_count}/{loop_end_count} 个代理，等待下一轮,sleep {sleep_time}'
)
log.info(f'当前有效代理共 {proxy_manager.available_count()} 个')
time.sleep(sleep_time)
reactor.stop()
