class HandleFailedRequests(object):
"""docstring for HandleFailedRequests"""
def __init__(self, redis_key):
super(HandleFailedRequests, self).__init__()
self._redis_key = redis_key
self._redisdb = RedisDB()
self._request_buffer = RequestBuffer(self._redis_key)
self._table_failed_request = setting.TAB_FAILED_REQUSETS.format(
redis_key=redis_key)
def get_failed_requests(self, count=10000):
failed_requests = self._redisdb.zget(self._table_failed_request,
count=count)
failed_requests = [
eval(failed_request) for failed_request in failed_requests
]
return failed_requests
def reput_failed_requests_to_requests(self):
log.debug("正在重置失败的requests...")
total_count = 0
while True:
try:
failed_requests = self.get_failed_requests()
if not failed_requests:
break
for request in failed_requests:
request["retry_times"] = 0
request_obj = Request.from_dict(request)
self._request_buffer.put_request(request_obj)
total_count += 1
except Exception as e:
log.exception(e)
self._request_buffer.flush()
log.debug("重置%s条失败requests为待抓取requests" % total_count)
class Scheduler(threading.Thread):
__custom_setting__ = {}
def __init__(
self,
redis_key=None,
thread_count=None,
begin_callback=None,
end_callback=None,
delete_keys=(),
auto_stop_when_spider_done=None,
auto_start_requests=None,
send_run_time=True,
batch_interval=0,
wait_lock=True,
task_table=None,
):
"""
@summary: 调度器
---------
@param redis_key: 爬虫request及item存放reis中的文件夹
@param thread_count: 线程数，默认为配置文件中的线程数
@param begin_callback: 爬虫开始回调函数
@param end_callback: 爬虫结束回调函数
@param delete_keys: 爬虫启动时删除的key，类型: 元组/bool/string。 支持正则
@param auto_stop_when_spider_done: 爬虫抓取完毕后是否自动结束或等待任务，默认自动结束
@param auto_start_requests: 爬虫是否自动添加任务
@param send_run_time: 发送运行时间
@param batch_interval: 抓取时间间隔 默认为0 天为单位 多次启动时，只有当前时间与第一次抓取结束的时间间隔大于指定的时间间隔时，爬虫才启动
@param wait_lock: 下发任务时否等待锁，若不等待锁，可能会存在多进程同时在下发一样的任务，因此分布式环境下请将该值设置True
@param task_table: 任务表， 批次爬虫传递
---------
@result:
"""
super(Scheduler, self).__init__()
for key, value in self.__class__.__custom_setting__.items():
setattr(setting, key, value)
log.reload()
self._redis_key = redis_key or setting.REDIS_KEY
if not self._redis_key:
raise Exception(
"""
redis_key 为redis中存放request与item的目录。不能为空，
可在setting中配置，如 REDIS_KEY = 'test'
或spider初始化时传参, 如 TestSpider(redis_key='test')
"""
)
self._request_buffer = RequestBuffer(redis_key)
self._item_buffer = ItemBuffer(redis_key, task_table)
self._collector = Collector(redis_key)
self._parsers = []
self._parser_controls = []
self._parser_control_obj = PaserControl
self._auto_stop_when_spider_done = (
auto_stop_when_spider_done
if auto_stop_when_spider_done is not None
else setting.AUTO_STOP_WHEN_SPIDER_DONE
)
self._auto_start_requests = (
auto_start_requests
if auto_start_requests is not None
else setting.SPIDER_AUTO_START_REQUESTS
)
self._send_run_time = send_run_time
self._batch_interval = batch_interval
self._begin_callback = (
begin_callback
if begin_callback
else lambda: log.info("\n********** feapder begin **********")
)
self._end_callback = (
end_callback
if end_callback
else lambda: log.info("\n********** feapder end **********")
)
self._thread_count = (
setting.SPIDER_THREAD_COUNT if not thread_count else thread_count
)
self._spider_name = redis_key
self._project_name = redis_key.split(":")[0]
self._tab_spider_time = setting.TAB_SPIDER_TIME.format(redis_key=redis_key)
self._tab_spider_status = setting.TAB_SPIDER_STATUS.format(redis_key=redis_key)
self._tab_requests = setting.TAB_REQUSETS.format(redis_key=redis_key)
self._tab_failed_requests = setting.TAB_FAILED_REQUSETS.format(
redis_key=redis_key
)
self._is_notify_end = False # 是否已经通知结束
self._last_task_count = 0 # 最近一次任务数量
self._redisdb = RedisDB()
self._project_total_state_table = "{}_total_state".format(self._project_name)
self._is_exist_project_total_state_table = False
# Request 缓存设置
Request.cached_redis_key = redis_key
Request.cached_expire_time = setting.RESPONSE_CACHED_EXPIRE_TIME
delete_keys = delete_keys or setting.DELETE_KEYS
if delete_keys:
self.delete_tables(delete_keys)
self._last_check_task_status_time = 0
self.wait_lock = wait_lock
def add_parser(self, parser):
parser = parser() # parser 实例化
if isinstance(parser, BaseParser):
self._parsers.append(parser)
else:
raise ValueError("类型错误，爬虫需继承feapder.BaseParser或feapder.BatchParser")
def run(self):
if not self.is_reach_next_spider_time():
return
self._start()
while True:
if self.all_thread_is_done():
if not self._is_notify_end:
self.spider_end() # 跑完一轮
self.record_spider_state(
spider_type=1,
state=1,
spider_end_time=tools.get_current_date(),
batch_interval=self._batch_interval,
)
self._is_notify_end = True
if self._auto_stop_when_spider_done:
self._stop_all_thread()
break
else:
self._is_notify_end = False
self.check_task_status()
tools.delay_time(1) # 1秒钟检查一次爬虫状态
def __add_task(self):
# 启动parser 的 start_requests
self.spider_begin() # 不自动结束的爬虫此处只能执行一遍
self.record_spider_state(
spider_type=1,
state=0,
batch_date=tools.get_current_date(),
spider_start_time=tools.get_current_date(),
batch_interval=self._batch_interval,
)
# 判断任务池中属否还有任务，若有接着抓取
todo_task_count = self._collector.get_requests_count()
if todo_task_count:
log.info("检查到有待做任务 %s 条，不重下发新任务。将接着上回异常终止处继续抓取" % todo_task_count)
else:
for parser in self._parsers:
results = parser.start_requests()
# 添加request到请求队列，由请求队列统一入库
if results and not isinstance(results, Iterable):
raise Exception("%s.%s返回值必须可迭代" % (parser.name, "start_requests"))
result_type = 1
for result in results or []:
if isinstance(result, Request):
result.parser_name = result.parser_name or parser.name
self._request_buffer.put_request(result)
result_type = 1
elif isinstance(result, Item):
self._item_buffer.put_item(result)
result_type = 2
elif callable(result): # callbale的request可能是更新数据库操作的函数
if result_type == 1:
self._request_buffer.put_request(result)
else:
self._item_buffer.put_item(result)
else:
raise TypeError(
"start_requests yield result type error, expect Request、Item、callback func, bug get type: {}".format(
type(result)
)
)
self._request_buffer.flush()
self._item_buffer.flush()
def _start(self):
# 启动request_buffer
self._request_buffer.start()
# 启动item_buffer
self._item_buffer.start()
# 启动collector
self._collector.start()
# 启动parser control
for i in range(self._thread_count):
parser_control = self._parser_control_obj(
self._collector,
self._redis_key,
self._request_buffer,
self._item_buffer,
)
for parser in self._parsers:
parser_control.add_parser(parser)
parser_control.start()
self._parser_controls.append(parser_control)
# 下发任务 因为时间可能比较长，放到最后面
if setting.RETRY_FAILED_REQUESTS:
# 重设失败的任务, 不用加锁，原子性操作
handle_failed_requests = HandleFailedRequests(self._redis_key)
handle_failed_requests.reput_failed_requests_to_requests()
# 下发新任务
if self._auto_start_requests: # 自动下发
if self.wait_lock:
# 将添加任务处加锁，防止多进程之间添加重复的任务
with RedisLock(
key=self._spider_name,
timeout=3600,
wait_timeout=60,
redis_cli=RedisDB().get_redis_obj(),
) as lock:
if lock.locked:
self.__add_task()
else:
self.__add_task()
def all_thread_is_done(self):
for i in range(3): # 降低偶然性, 因为各个环节不是并发的，很有可能当时状态为假，但检测下一条时该状态为真。一次检测很有可能遇到这种偶然性
# 检测 collector 状态
if (
self._collector.is_collector_task()
or self._collector.get_requests_count() > 0
):
return False
# 检测 parser_control 状态
for parser_control in self._parser_controls:
if not parser_control.is_not_task():
return False
# 检测 item_buffer 状态
if (
self._item_buffer.get_items_count() > 0
or self._item_buffer.is_adding_to_db()
):
return False
# 检测 request_buffer 状态
if (
self._request_buffer.get_requests_count() > 0
or self._request_buffer.is_adding_to_db()
):
return False
tools.delay_time(1)
return True
@tools.run_safe_model("check_task_status")
def check_task_status(self):
"""
检查任务状态 预警
"""
# 每分钟检查一次
now_time = time.time()
if now_time - self._last_check_task_status_time > 60:
self._last_check_task_status_time = now_time
else:
return
# 检查redis中任务状态，若连续20分钟内任务数量未发生变化（parser可能卡死），则发出报警信息
task_count = self._redisdb.zget_count(self._tab_requests)
if task_count:
if task_count != self._last_task_count:
self._last_task_count = task_count
self._redisdb.hset(
self._tab_spider_time,
SPIDER_LAST_TASK_COUNT_RECORD_TIME_KEY,
tools.get_current_timestamp(),
) # 多进程会重复发消息， 使用reids记录上次统计时间
else:
# 判断时间间隔是否超过20分钟
lua = """
-- local key = KEYS[1]
local field = ARGV[1]
local current_timestamp = ARGV[2]
-- 取值
local last_timestamp = redis.call('hget', KEYS[1], field)
if last_timestamp and current_timestamp - last_timestamp >= 1200 then
return current_timestamp - last_timestamp -- 返回任务停滞时间 秒
end
if not last_timestamp then
redis.call('hset', KEYS[1], field, current_timestamp)
end
return 0
"""
redis_obj = self._redisdb.get_redis_obj()
cmd = redis_obj.register_script(lua)
overtime = cmd(
keys=[self._tab_spider_time],
args=[
SPIDER_LAST_TASK_COUNT_RECORD_TIME_KEY,
tools.get_current_timestamp(),
],
)
if overtime:
# 发送报警
msg = "《{}》爬虫任务停滞 {}，请检查爬虫是否正常".format(
self._spider_name, tools.format_seconds(overtime)
)
log.error(msg)
self.send_msg(
msg,
level="error",
message_prefix="《{}》爬虫任务停滞".format(self._spider_name),
)
else:
self._last_task_count = 0
# 检查失败任务数量 超过1000 报警，
failed_count = self._redisdb.zget_count(self._tab_failed_requests)
if failed_count > setting.WARNING_FAILED_COUNT:
# 发送报警
msg = "《%s》爬虫当前失败任务 %s, 请检查爬虫是否正常" % (self._spider_name, failed_count)
log.error(msg)
self.send_msg(
msg,
level="error",
message_prefix="《%s》爬虫当前失败任务数预警" % (self._spider_name),
)
# parser_control实时统计已做任务数及失败任务数，若失败数大于10且失败任务数/已做任务数>=0.5 则报警
failed_task_count, success_task_count = PaserControl.get_task_status_count()
total_count = success_task_count + failed_task_count
if total_count > 0:
task_success_rate = success_task_count / total_count
if task_success_rate < 0.5:
# 发送报警
msg = "《%s》爬虫当前任务成功数%s, 失败数%s, 成功率 %.2f, 请检查爬虫是否正常" % (
self._spider_name,
success_task_count,
failed_task_count,
task_success_rate,
)
log.error(msg)
# 统计下上次发消息的时间，若时间大于1小时，则报警（此处为多进程，需要考虑别报重复）
self.send_msg(
msg,
level="error",
message_prefix="《%s》爬虫当前任务成功率" % (self._spider_name),
)
def delete_tables(self, delete_tables_list):
if isinstance(delete_tables_list, bool):
delete_tables_list = [self._redis_key + "*"]
elif not isinstance(delete_tables_list, (list, tuple)):
delete_tables_list = [delete_tables_list]
redis = RedisDB()
for delete_tab in delete_tables_list:
if not delete_tab.startswith(self._redis_key):
delete_tab = self._redis_key + delete_tab
tables = redis.getkeys(delete_tab)
for table in tables:
if table != self._tab_spider_time:
log.info("正在删除key %s" % table)
redis.clear(table)
def _stop_all_thread(self):
self._request_buffer.stop()
self._item_buffer.stop()
# 停止 collector
self._collector.stop()
# 停止 parser_controls
for parser_control in self._parser_controls:
parser_control.stop()
def send_msg(self, msg, level="debug", message_prefix=""):
if setting.WARNING_LEVEL == "ERROR":
if level != "error":
return
if setting.DINGDING_WARNING_PHONE:
keyword = "feapder报警系统\n"
tools.dingding_warning(keyword + msg, message_prefix=message_prefix)
if setting.EMAIL_RECEIVER:
tools.email_warning(
msg, message_prefix=message_prefix, title=self._spider_name
)
def spider_begin(self):
"""
@summary: start_monitor_task 方式启动，此函数与spider_end不在同一进程内，变量不可共享
---------
---------
@result:
"""
if self._begin_callback:
self._begin_callback()
for parser in self._parsers:
parser.start_callback()
# 记录开始时间
if not self._redisdb.hexists(self._tab_spider_time, SPIDER_START_TIME_KEY):
current_timestamp = tools.get_current_timestamp()
self._redisdb.hset(
self._tab_spider_time, SPIDER_START_TIME_KEY, current_timestamp
)
# 发送消息
self.send_msg("《%s》爬虫开始" % self._spider_name)
def spider_end(self):
self.record_end_time()
if self._end_callback:
self._end_callback()
for parser in self._parsers:
parser.close()
parser.end_callback()
# 关闭webdirver
if Request.webdriver_pool:
Request.webdriver_pool.close()
# 计算抓取时常
data = self._redisdb.hget(
self._tab_spider_time, SPIDER_START_TIME_KEY, is_pop=True
)
if data:
begin_timestamp = int(data)
spand_time = tools.get_current_timestamp() - begin_timestamp
msg = "《%s》爬虫结束，耗时 %s" % (
self._spider_name,
tools.format_seconds(spand_time),
)
log.info(msg)
if self._send_run_time:
self.send_msg(msg)
if not self._auto_stop_when_spider_done:
log.info("爬虫不自动结束， 等待下一轮任务...")
else:
self.delete_tables(self._tab_spider_status)
def record_end_time(self):
# 记录结束时间
if self._batch_interval:
current_timestamp = tools.get_current_timestamp()
self._redisdb.hset(
self._tab_spider_time, SPIDER_END_TIME_KEY, current_timestamp
)
def is_reach_next_spider_time(self):
if not self._batch_interval:
return True
last_spider_end_time = self._redisdb.hget(
self._tab_spider_time, SPIDER_END_TIME_KEY
)
if last_spider_end_time:
last_spider_end_time = int(last_spider_end_time)
current_timestamp = tools.get_current_timestamp()
time_interval = current_timestamp - last_spider_end_time
if time_interval < self._batch_interval * 86400:
log.info(
"上次运行结束时间为 {} 与当前时间间隔 为 {}, 小于规定的抓取时间间隔 {}。爬虫不执行，退出～".format(
tools.timestamp_to_date(last_spider_end_time),
tools.format_seconds(time_interval),
tools.format_seconds(self._batch_interval * 86400),
)
)
return False
return True
def record_spider_state(
self,
spider_type,
state,
batch_date=None,
spider_start_time=None,
spider_end_time=None,
batch_interval=None,
):
pass
class BatchSpider(BatchParser, Scheduler):
def __init__(
self,
task_table,
batch_record_table,
batch_name,
batch_interval,
task_keys,
task_state="state",
min_task_count=10000,
check_task_interval=5,
task_limit=10000,
related_redis_key=None,
related_batch_record=None,
task_condition="",
task_order_by="",
redis_key=None,
thread_count=None,
begin_callback=None,
end_callback=None,
delete_keys=(),
auto_stop_when_spider_done=None,
send_run_time=False,
):
"""
@summary: 批次爬虫
必要条件
1、需有任务表
任务表中必须有id 及 任务状态字段 如 state。如指定parser_name字段，则任务会自动下发到对应的parser下, 否则会下发到所有的parser下。其他字段可根据爬虫需要的参数自行扩充
参考建表语句如下：
CREATE TABLE `table_name` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`param` varchar(1000) DEFAULT NULL COMMENT '爬虫需要的抓取数据需要的参数',
`state` int(11) DEFAULT NULL COMMENT '任务状态',
`parser_name` varchar(255) DEFAULT NULL COMMENT '任务解析器的脚本类名',
PRIMARY KEY (`id`),
UNIQUE KEY `nui` (`param`) USING BTREE
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8;
2、需有批次记录表 不存在自动创建
---------
@param task_table: mysql中的任务表
@param batch_record_table: mysql 中的批次记录表
@param batch_name: 批次采集程序名称
@param batch_interval: 批次间隔 天为单位。 如想一小时一批次，可写成1/24
@param task_keys: 需要获取的任务字段 列表 [] 如需指定解析的parser，则需将parser_name字段取出来。
@param task_state: mysql中任务表的任务状态字段
@param min_task_count: redis 中最少任务数, 少于这个数量会从mysql的任务表取任务
@param check_task_interval: 检查是否还有任务的时间间隔；
@param task_limit: 从数据库中取任务的数量
@param redis_key: 任务等数据存放在redis中的key前缀
@param thread_count: 线程数，默认为配置文件中的线程数
@param begin_callback: 爬虫开始回调函数
@param end_callback: 爬虫结束回调函数
@param delete_keys: 爬虫启动时删除的key，类型: 元组/bool/string。 支持正则; 常用于清空任务队列，否则重启时会断点续爬
@param auto_stop_when_spider_done: 爬虫抓取完毕后是否自动结束或等待任务，默认自动结束
@param send_run_time: 发送运行时间
@param related_redis_key: 有关联的其他爬虫任务表（redis）注意：要避免环路 如 A -> B & B -> A 。
@param related_batch_record: 有关联的其他爬虫批次表（mysql）注意：要避免环路 如 A -> B & B -> A 。
related_redis_key 与 related_batch_record 选其一配置即可；用于相关联的爬虫没结束时，本爬虫也不结束
若相关连的爬虫为批次爬虫，推荐以related_batch_record配置，
若相关连的爬虫为普通爬虫，无批次表，可以以related_redis_key配置
@param task_condition: 任务条件 用于从一个大任务表中挑选出数据自己爬虫的任务，即where后的条件语句
@param task_order_by: 取任务时的排序条件 如 id desc
---------
@result:
"""
Scheduler.__init__(
self,
redis_key=redis_key,
thread_count=thread_count,
begin_callback=begin_callback,
end_callback=end_callback,
delete_keys=delete_keys,
auto_stop_when_spider_done=auto_stop_when_spider_done,
auto_start_requests=False,
send_run_time=send_run_time,
batch_interval=batch_interval,
)
self._redisdb = RedisDB()
self._mysqldb = MysqlDB()
self._request_buffer = RequestBuffer(self._redis_key)
self._task_table = task_table # mysql中的任务表
self._batch_record_table = batch_record_table # mysql 中的批次记录表
self._batch_name = batch_name # 批次采集程序名称
self._task_keys = task_keys # 需要获取的任务字段
self._task_state = task_state # mysql中任务表的state字段名
self._min_task_count = min_task_count # redis 中最少任务数
self._check_task_interval = check_task_interval
self._task_limit = task_limit # mysql中一次取的任务数量
self._related_task_tables = [
setting.TAB_REQUSETS.format(redis_key=redis_key)
] # 自己的task表也需要检查是否有任务
if related_redis_key:
self._related_task_tables.append(
setting.TAB_REQUSETS.format(redis_key=related_redis_key))
self._related_batch_record = related_batch_record
self._task_condition = task_condition
self._task_condition_prefix_and = task_condition and " and {}".format(
task_condition)
self._task_condition_prefix_where = task_condition and " where {}".format(
task_condition)
self._task_order_by = task_order_by and " order by {}".format(
task_order_by)
self._batch_date_cache = None
if self._batch_interval >= 1:
self._date_format = "%Y-%m-%d"
elif self._batch_interval < 1 and self._batch_interval >= 1 / 24:
self._date_format = "%Y-%m-%d %H"
else:
self._date_format = "%Y-%m-%d %H:%M"
# 报警相关
self._send_msg_interval = datetime.timedelta(hours=1) # 每隔1小时发送一次报警
self._last_send_msg_time = None
self._spider_last_done_time = None # 爬虫最近已做任务数量时间
self._spider_last_done_count = 0 # 爬虫最近已做任务数量
self._spider_deal_speed_cached = None
self._is_more_parsers = True # 多模版类爬虫
def init_property(self):
"""
每个批次开始时需要重置的属性
@return:
"""
self._last_send_msg_time = None
self._spider_last_done_time = None
self._spider_last_done_count = 0 # 爬虫刚开始启动时已做任务数量
def add_parser(self, parser):
parser = parser(
self._task_table,
self._batch_record_table,
self._task_state,
self._date_format,
self._mysqldb,
) # parser 实例化
self._parsers.append(parser)
def start_monitor_task(self):
"""
@summary: 监控任务状态
---------
---------
@result:
"""
if not self._parsers: # 不是多模版模式， 将自己注入到parsers，自己为模版
self._is_more_parsers = False
self._parsers.append(self)
elif len(self._parsers) <= 1:
self._is_more_parsers = False
self.create_batch_record_table()
# 添加任务
for parser in self._parsers:
parser.add_task()
is_first_check = True
while True:
try:
if self.check_batch(is_first_check): # 该批次已经做完
if not self._auto_stop_when_spider_done:
is_first_check = True
log.info("爬虫所有任务已做完，不自动结束，等待新任务...")
time.sleep(self._check_task_interval)
continue
else:
break
is_first_check = False
# 检查redis中是否有任务 任务小于_min_task_count 则从mysql中取
tab_requests = setting.TAB_REQUSETS.format(
redis_key=self._redis_key)
todo_task_count = self._redisdb.zget_count(tab_requests)
tasks = []
if todo_task_count < self._min_task_count: # 从mysql中取任务
# 更新batch表的任务状态数量
self.update_task_done_count()
log.info("redis 中剩余任务%s 数量过小 从mysql中取任务追加" %
todo_task_count)
tasks = self.get_todo_task_from_mysql()
if not tasks: # 状态为0的任务已经做完，需要检查状态为2的任务是否丢失
if (todo_task_count == 0
): # redis 中无待做任务，此时mysql中状态为2的任务为丢失任务。需重新做
lose_task_count = self.get_lose_task_count()
if not lose_task_count:
time.sleep(self._check_task_interval)
continue
elif (
lose_task_count > self._task_limit * 5
): # 丢失任务太多，直接重置，否则每次等redis任务消耗完再取下一批丢失任务，速度过慢
log.info("正在重置丢失任务为待做 共 {} 条".format(
lose_task_count))
# 重置正在做的任务为待做
if self.reset_lose_task_from_mysql():
log.info("重置丢失任务成功")
else:
log.info("重置丢失任务失败")
continue
else: # 丢失任务少，直接取
log.info("正在取丢失任务 共 {} 条, 取 {} 条".format(
lose_task_count,
self._task_limit
if self._task_limit <= lose_task_count else
lose_task_count,
))
tasks = self.get_doing_task_from_mysql()
else:
log.info("mysql 中取到待做任务 %s 条" % len(tasks))
else:
log.info("redis 中尚有%s条积压任务，暂时不派发新任务" % todo_task_count)
if not tasks:
if todo_task_count >= self._min_task_count:
# log.info('任务正在进行 redis中剩余任务 %s' % todo_task_count)
pass
else:
log.info("mysql 中无待做任务 redis中剩余任务 %s" %
todo_task_count)
else:
# make start requests
self.distribute_task(tasks)
log.info("添加任务到redis成功")
except Exception as e:
log.exception(e)
time.sleep(self._check_task_interval)
def create_batch_record_table(self):
sql = (
"select table_name from information_schema.tables where table_name like '%s'"
% self._batch_record_table)
tables_name = self._mysqldb.find(sql)
if not tables_name:
sql = """
CREATE TABLE `{table_name}` (
`id` int(11) UNSIGNED NOT NULL AUTO_INCREMENT,
`batch_date` {batch_date} DEFAULT NULL COMMENT '批次时间',
`total_count` int(11) DEFAULT NULL COMMENT '任务总数',
`done_count` int(11) DEFAULT NULL COMMENT '完成数 (1,-1)',
`fail_count` int(11) DEFAULT NULL COMMENT '失败任务数 (-1)',
`interval` float(11) DEFAULT NULL COMMENT '批次间隔',
`interval_unit` varchar(20) DEFAULT NULL COMMENT '批次间隔单位 day, hour',
`create_time` datetime DEFAULT CURRENT_TIMESTAMP COMMENT '批次开始时间',
`update_time` datetime DEFAULT CURRENT_TIMESTAMP COMMENT '本条记录更新时间',
`is_done` int(11) DEFAULT '0' COMMENT '批次是否完成 0 未完成 1 完成',
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8;
""".format(
table_name=self._batch_record_table,
batch_date="date"
if self._date_format == "%Y-%m-%d" else "datetime",
)
self._mysqldb.execute(sql)
def distribute_task(self, tasks):
"""
@summary: 分发任务
---------
@param tasks:
---------
@result:
"""
if self._is_more_parsers: # 为多模版类爬虫，需要下发指定的parser
for task in tasks:
for parser in self._parsers: # 寻找task对应的parser
if parser.name in task:
requests = parser.start_requests(task)
if requests and not isinstance(requests, Iterable):
raise Exception("%s.%s返回值必须可迭代" %
(parser.name, "start_requests"))
result_type = 1
for request in requests or []:
if isinstance(request, Request):
request.parser_name = request.parser_name or parser.name
self._request_buffer.put_request(request)
result_type = 1
elif isinstance(request, Item):
self._item_buffer.put_item(request)
result_type = 2
if (self._item_buffer.get_items_count() >=
MAX_ITEM_COUNT):
self._item_buffer.flush()
elif callable(
request): # callbale的request可能是更新数据库操作的函数
if result_type == 1:
self._request_buffer.put_request(request)
else:
self._item_buffer.put_item(request)
if (self._item_buffer.get_items_count() >=
MAX_ITEM_COUNT):
self._item_buffer.flush()
else:
raise TypeError(
"start_requests yield result type error, expect Request、Item、callback func, bug get type: {}"
.format(type(requests)))
break
else: # task没对应的parser 则将task下发到所有的parser
for task in tasks:
for parser in self._parsers:
requests = parser.start_requests(task)
if requests and not isinstance(requests, Iterable):
raise Exception("%s.%s返回值必须可迭代" %
(parser.name, "start_requests"))
result_type = 1
for request in requests or []:
if isinstance(request, Request):
request.parser_name = request.parser_name or parser.name
self._request_buffer.put_request(request)
result_type = 1
elif isinstance(request, Item):
self._item_buffer.put_item(request)
result_type = 2
if self._item_buffer.get_items_count(
) >= MAX_ITEM_COUNT:
self._item_buffer.flush()
elif callable(
request): # callbale的request可能是更新数据库操作的函数
if result_type == 1:
self._request_buffer.put_request(request)
else:
self._item_buffer.put_item(request)
if (self._item_buffer.get_items_count() >=
MAX_ITEM_COUNT):
self._item_buffer.flush()
self._request_buffer.flush()
self._item_buffer.flush()
def __get_task_state_count(self):
sql = "select {state}, count(1) from {task_table}{task_condition} group by {state}".format(
state=self._task_state,
task_table=self._task_table,
task_condition=self._task_condition_prefix_where,
)
task_state_count = self._mysqldb.find(sql)
task_state = {
"total_count":
sum(count for state, count in task_state_count),
"done_count":
sum(count for state, count in task_state_count
if state in (1, -1)),
"failed_count":
sum(count for state, count in task_state_count if state == -1),
}
return task_state
def update_task_done_count(self):
"""
@summary: 更新批次表中的任务状态
---------
---------
@result:
"""
task_count = self.__get_task_state_count()
# log.info('《%s》 批次进度 %s/%s' % (self._batch_name, done_task_count, total_task_count))
# 更新批次表
sql = "update {} set done_count = {}, total_count = {}, fail_count = {}, update_time = CURRENT_TIME, is_done=0, `interval` = {}, interval_unit = '{}' where batch_date = '{}'".format(
self._batch_record_table,
task_count.get("done_count"),
task_count.get("total_count"),
task_count.get("failed_count"),
self._batch_interval
if self._batch_interval >= 1 else self._batch_interval * 24,
"day" if self._batch_interval >= 1 else "hour",
self.batch_date,
)
self._mysqldb.update(sql)
def update_is_done(self):
sql = "update {} set is_done = 1, update_time = CURRENT_TIME where batch_date = '{}' and is_done = 0".format(
self._batch_record_table, self.batch_date)
self._mysqldb.update(sql)
def get_todo_task_from_mysql(self):
"""
@summary: 取待做的任务
---------
---------
@result:
"""
# TODO 分批取数据 每批最大取 1000000个，防止内存占用过大
# 查询任务
sql = "select %s from %s where %s = 0%s%s limit %s" % (
", ".join(self._task_keys),
self._task_table,
self._task_state,
self._task_condition_prefix_and,
self._task_order_by,
self._task_limit,
)
tasks = self._mysqldb.find(sql)
if tasks:
# 更新任务状态
for i in range(0, len(tasks), 10000): # 10000 一批量更新
task_ids = str(tuple([task[0] for task in tasks[i:i + 10000]
])).replace(",)", ")")
sql = "update %s set %s = 2 where id in %s" % (
self._task_table,
self._task_state,
task_ids,
)
self._mysqldb.update(sql)
return tasks
def get_doing_task_from_mysql(self):
"""
@summary: 取正在做的任务
---------
---------
@result:
"""
# 查询任务
sql = "select %s from %s where %s = 2%s%s limit %s" % (
", ".join(self._task_keys),
self._task_table,
self._task_state,
self._task_condition_prefix_and,
self._task_order_by,
self._task_limit,
)
tasks = self._mysqldb.find(sql)
return tasks
def get_lose_task_count(self):
sql = 'select date_format(batch_date, "{date_format}"), total_count, done_count from {batch_record_table} order by id desc limit 1'.format(
date_format=self._date_format.replace(":%M", ":%i"),
batch_record_table=self._batch_record_table,
)
batch_info = self._mysqldb.find(sql) # (('2018-08-19', 49686, 0),)
batch_date, total_count, done_count = batch_info[0]
return total_count - done_count
def reset_lose_task_from_mysql(self):
"""
@summary: 重置丢失任务为待做
---------
---------
@result:
"""
sql = "update {table} set {state} = 0 where {state} = 2{task_condition}".format(
table=self._task_table,
state=self._task_state,
task_condition=self._task_condition_prefix_and,
)
return self._mysqldb.update(sql)
def get_deal_speed(self, total_count, done_count, last_batch_date):
"""
获取处理速度
@param total_count: 总数量
@param done_count: 做完数量
@param last_batch_date: 批次时间 datetime
@return:
deal_speed （条/小时）, need_time （秒）, overflow_time（秒） （ overflow_time < 0 时表示提前多少秒完成 )
或
None
"""
if not self._spider_last_done_count:
now_date = datetime.datetime.now()
self._spider_last_done_count = done_count
self._spider_last_done_time = now_date
if done_count > self._spider_last_done_count:
now_date = datetime.datetime.now()
time_interval = (now_date -
self._spider_last_done_time).total_seconds()
deal_speed = (done_count -
self._spider_last_done_count) / time_interval # 条/秒
need_time = (total_count - done_count) / deal_speed # 单位秒
overflow_time = (
(now_date - last_batch_date).total_seconds() + need_time -
datetime.timedelta(days=self._batch_interval).total_seconds()
) # 溢出时间 秒
calculate_speed_time = now_date.strftime(
"%Y-%m-%d %H:%M:%S") # 统计速度时间
deal_speed = int(deal_speed * 3600) # 条/小时
# 更新最近已做任务数及时间
self._spider_last_done_count = done_count
self._spider_last_done_time = now_date
self._spider_deal_speed_cached = (
deal_speed,
need_time,
overflow_time,
calculate_speed_time,
)
return self._spider_deal_speed_cached
def init_task(self):
"""
@summary: 初始化任务表中的任务， 新一个批次开始时调用。 可能会重写
---------
---------
@result:
"""
sql = "update {task_table} set {state} = 0 where {state} != -1{task_condition}".format(
task_table=self._task_table,
state=self._task_state,
task_condition=self._task_condition_prefix_and,
)
return self._mysqldb.update(sql)
def check_batch(self, is_first_check=False):
"""
@summary: 检查批次是否完成
---------
@param: is_first_check 是否为首次检查，若首次检查，且检查结果为批次已完成，则不发送批次完成消息。因为之前发送过了
---------
@result: 完成返回True 否则False
"""
sql = 'select date_format(batch_date, "{date_format}"), total_count, done_count from {batch_record_table} order by id desc limit 1'.format(
date_format=self._date_format.replace(":%M", ":%i"),
batch_record_table=self._batch_record_table,
)
batch_info = self._mysqldb.find(sql) # (('2018-08-19', 49686, 0),)
if batch_info:
batch_date, total_count, done_count = batch_info[0]
now_date = datetime.datetime.now()
last_batch_date = datetime.datetime.strptime(
batch_date, self._date_format)
time_difference = now_date - last_batch_date
if total_count == done_count and time_difference < datetime.timedelta(
days=self._batch_interval): # 若在本批次内，再次检查任务表是否有新增任务
# # 改成查询任务表 看是否真的没任务了，因为batch_record表里边的数量可能没来得及更新
task_count = self.__get_task_state_count()
total_count = task_count.get("total_count")
done_count = task_count.get("done_count")
if total_count == done_count:
# 检查相关联的爬虫是否完成
releated_spider_is_done = self.related_spider_is_done()
if releated_spider_is_done == False:
msg = "《{}》本批次未完成, 正在等待依赖爬虫 {} 结束. 批次时间 {} 批次进度 {}/{}".format(
self._batch_name,
self._related_batch_record
or self._related_task_tables,
batch_date,
done_count,
total_count,
)
log.info(msg)
# 检查是否超时 超时发出报警
if time_difference >= datetime.timedelta(
days=self._batch_interval): # 已经超时
if (not self._last_send_msg_time
or now_date - self._last_send_msg_time >=
self._send_msg_interval):
self._last_send_msg_time = now_date
self.send_msg(msg, level="error")
return False
elif releated_spider_is_done == True:
# 更新is_done 状态
self.update_is_done()
else:
self.update_is_done()
msg = "《{}》本批次完成 批次时间 {} 共处理 {} 条任务".format(
self._batch_name, batch_date, done_count)
log.info(msg)
if not is_first_check:
self.send_msg(msg)
# 判断下一批次是否到
if time_difference >= datetime.timedelta(
days=self._batch_interval):
msg = "《{}》下一批次开始".format(self._batch_name)
log.info(msg)
self.send_msg(msg)
# 初始化任务表状态
if self.init_task() != False: # 更新失败返回False 其他返回True/None
# 初始化属性
self.init_property()
is_success = (
self.record_batch()
) # 有可能插入不成功，但是任务表已经重置了，不过由于当前时间为下一批次的时间，检查批次是否结束时不会检查任务表，所以下次执行时仍然会重置
if is_success:
log.info(
"插入新批次记录成功 1分钟后开始下发任务") # 防止work批次时间没来得及更新
tools.delay_time(60)
return False # 下一批次开始
else:
return True # 下一批次不开始。先不派发任务，因为批次表新批次插入失败了，需要插入成功后再派发任务
else:
log.info("《{}》下次批次时间未到".format(self._batch_name))
if not is_first_check:
self.send_msg("《{}》下次批次时间未到".format(self._batch_name))
return True
else:
if time_difference >= datetime.timedelta(
days=self._batch_interval): # 已经超时
time_out = time_difference - datetime.timedelta(
days=self._batch_interval)
time_out_pretty = tools.format_seconds(
time_out.total_seconds())
msg = "《{}》本批次已超时{} 批次时间 {}, 批次进度 {}/{}".format(
self._batch_name,
time_out_pretty,
batch_date,
done_count,
total_count,
)
if self._batch_interval >= 1:
msg += ", 期望时间{}天".format(self._batch_interval)
else:
msg += ", 期望时间{}小时".format(self._batch_interval * 24)
result = self.get_deal_speed(
total_count=total_count,
done_count=done_count,
last_batch_date=last_batch_date,
)
if result:
deal_speed, need_time, overflow_time, calculate_speed_time = (
result)
msg += ", 任务处理速度于{}统计, 约 {}条/小时, 预计还需 {}".format(
calculate_speed_time,
deal_speed,
tools.format_seconds(need_time),
)
if overflow_time > 0:
msg += ", 该批次预计总超时 {}, 请及时处理".format(
tools.format_seconds(overflow_time))
log.info(msg)
if (not self._last_send_msg_time
or now_date - self._last_send_msg_time >=
self._send_msg_interval):
self._last_send_msg_time = now_date
self.send_msg(msg, level="error")
else: # 未超时
remaining_time = (
datetime.timedelta(days=self._batch_interval) -
time_difference)
remaining_time_pretty = tools.format_seconds(
remaining_time.total_seconds())
if self._batch_interval >= 1:
msg = "《{}》本批次正在进行, 批次时间 {}, 批次进度 {}/{}, 期望时间{}天, 剩余{}".format(
self._batch_name,
batch_date,
done_count,
total_count,
self._batch_interval,
remaining_time_pretty,
)
else:
msg = "《{}》本批次正在进行, 批次时间 {}, 批次进度 {}/{}, 期望时间{}小时, 剩余{}".format(
self._batch_name,
batch_date,
done_count,
total_count,
self._batch_interval * 24,
remaining_time_pretty,
)
result = self.get_deal_speed(
total_count=total_count,
done_count=done_count,
last_batch_date=last_batch_date,
)
if result:
deal_speed, need_time, overflow_time, calculate_speed_time = (
result)
msg += ", 任务处理速度于{}统计, 约 {}条/小时, 预计还需 {}".format(
calculate_speed_time,
deal_speed,
tools.format_seconds(need_time),
)
if overflow_time > 0:
msg += ", 该批次可能会超时 {}, 请及时处理".format(
tools.format_seconds(overflow_time))
# 发送警报
if (not self._last_send_msg_time
or now_date - self._last_send_msg_time >=
self._send_msg_interval):
self._last_send_msg_time = now_date
self.send_msg(msg, level="error")
elif overflow_time < 0:
msg += ", 该批次预计提前 {} 完成".format(
tools.format_seconds(-overflow_time))
log.info(msg)
else:
# 插入batch_date
self.record_batch()
# 初始化任务表状态 可能有产生任务的代码
self.init_task()
return False
def related_spider_is_done(self):
"""
相关连的爬虫是否跑完
@return: True / False / None 表示无相关的爬虫 可由自身的total_count 和 done_count 来判断
"""
for related_redis_task_table in self._related_task_tables:
if self._redisdb.exists_key(related_redis_task_table):
return False
if self._related_batch_record:
sql = "select is_done from {} order by id desc limit 1".format(
self._related_batch_record)
is_done = self._mysqldb.find(sql)
is_done = is_done[0][0] if is_done else None
if is_done is None:
log.warning("相关联的批次表不存在或无批次信息")
return None
if not is_done:
return False
return True
def record_batch(self):
"""
@summary: 记录批次信息（初始化）
---------
---------
@result:
"""
# 查询总任务数
sql = "select count(1) from %s%s" % (
self._task_table,
self._task_condition_prefix_where,
)
total_task_count = self._mysqldb.find(sql)[0][0]
batch_date = tools.get_current_date(self._date_format)
sql = (
"insert into %s (batch_date, done_count, total_count, `interval`, interval_unit, create_time) values ('%s', %s, %s, %s, '%s', CURRENT_TIME)"
% (
self._batch_record_table,
batch_date,
0,
total_task_count,
self._batch_interval
if self._batch_interval >= 1 else self._batch_interval * 24,
"day" if self._batch_interval >= 1 else "hour",
))
affect_count = self._mysqldb.add(sql) # None / 0 / 1 (1 为成功)
if affect_count:
# 重置批次日期
self._batch_date_cache = batch_date
# 重新刷下self.batch_date 中的 os.environ.get('batch_date') 否则日期还停留在上一个批次
os.environ["batch_date"] = self._batch_date_cache
# 爬虫开始
self.spider_begin()
self.record_spider_state(
spider_type=2,
state=0,
batch_date=batch_date,
spider_start_time=tools.get_current_date(),
batch_interval=self._batch_interval,
)
else:
log.error("插入新批次失败")
return affect_count
# -------- 批次结束逻辑 ------------
def task_is_done(self):
"""
@summary: 检查任务状态 是否做完 同时更新批次时间 (不能挂 挂了批次时间就不更新了)
---------
---------
@result: True / False （做完 / 未做完）
"""
is_done = False
# 查看批次记录表任务状态
sql = 'select date_format(batch_date, "{date_format}"), total_count, done_count, is_done from {batch_record_table} order by id desc limit 1'.format(
date_format=self._date_format.replace(":%M", ":%i"),
batch_record_table=self._batch_record_table,
)
batch_info = self._mysqldb.find(sql)
if batch_info is None:
raise Exception("查询批次信息失败")
if batch_info:
self._batch_date_cache, total_count, done_count, is_done = batch_info[
0] # 更新self._batch_date_cache, 防止新批次已经开始了，但self._batch_date_cache还是原来的批次时间
log.info("《%s》 批次时间%s 批次进度 %s/%s 完成状态 %d" % (
self._batch_name,
self._batch_date_cache,
done_count,
total_count,
is_done,
))
os.environ[
"batch_date"] = self._batch_date_cache # 更新BatchParser里边的批次时间
if is_done: # 检查任务表中是否有没做的任务 若有则is_done 为 False
# 比较耗时 加锁防止多进程同时查询
with RedisLock(
key=self._spider_name,
timeout=3600,
wait_timeout=0,
redis_cli=RedisDB().get_redis_obj(),
) as lock:
if lock.locked:
log.info("批次表标记已完成，正在检查任务表是否有未完成的任务")
sql = "select 1 from %s where (%s = 0 or %s=2)%s limit 1" % (
self._task_table,
self._task_state,
self._task_state,
self._task_condition_prefix_and,
)
tasks = self._mysqldb.find(sql) # [(1,)] / []
if tasks:
log.info("检测到任务表中有未完成任务，等待任务下发")
is_done = False
# 更新batch_record 表的is_done 状态，减少查询任务表的次数
sql = 'update {batch_record_table} set is_done = 0 where batch_date = "{batch_date}"'.format(
batch_record_table=self._batch_record_table,
batch_date=self._batch_date_cache,
)
self._mysqldb.update(sql)
else:
log.info("任务表中任务均已完成，爬虫结束")
else:
log.info("批次表标记已完成，其他爬虫进程正在检查任务表是否有未完成的任务，本进程跳过检查，继续等待")
is_done = False
return is_done
def run(self):
"""
@summary: 重写run方法 检查mysql中的任务是否做完， 做完停止
---------
---------
@result:
"""
try:
self.create_batch_record_table()
if not self._parsers: # 不是add_parser 模式
self._parsers.append(self)
self._start()
while True:
if (
self.task_is_done() and self.all_thread_is_done()
): # redis全部的任务已经做完 并且mysql中的任务已经做完（检查各个线程all_thread_is_done，防止任务没做完，就更新任务状态，导致程序结束的情况）
if not self._is_notify_end:
self.spider_end()
self.record_spider_state(
spider_type=2,
state=1,
batch_date=self._batch_date_cache,
spider_end_time=tools.get_current_date(),
batch_interval=self._batch_interval,
)
self._is_notify_end = True
if self._auto_stop_when_spider_done:
self._stop_all_thread()
break
else:
self._is_notify_end = False
self.check_task_status()
tools.delay_time(10) # 10秒钟检查一次爬虫状态
except Exception as e:
msg = "《%s》主线程异常 爬虫结束 exception: %s" % (self._batch_name, e)
log.error(msg)
self.send_msg(msg)
os._exit(137) # 使退出码为35072 方便爬虫管理器重启
@classmethod
def to_DebugBatchSpider(cls, *args, **kwargs):
# DebugBatchSpider 继承 cls
DebugBatchSpider.__bases__ = (cls, )
DebugBatchSpider.__name__ = cls.__name__
return DebugBatchSpider(*args, **kwargs)
class Scheduler(threading.Thread):
__custom_setting__ = {}
def __init__(
self,
redis_key=None,
thread_count=None,
begin_callback=None,
end_callback=None,
delete_keys=(),
keep_alive=None,
auto_start_requests=None,
batch_interval=0,
wait_lock=True,
task_table=None,
**kwargs,
):
"""
@summary: 调度器
---------
@param redis_key: 爬虫request及item存放redis中的文件夹
@param thread_count: 线程数，默认为配置文件中的线程数
@param begin_callback: 爬虫开始回调函数
@param end_callback: 爬虫结束回调函数
@param delete_keys: 爬虫启动时删除的key，类型: 元组/bool/string。 支持正则
@param keep_alive: 爬虫是否常驻，默认否
@param auto_start_requests: 爬虫是否自动添加任务
@param batch_interval: 抓取时间间隔 默认为0 天为单位 多次启动时，只有当前时间与第一次抓取结束的时间间隔大于指定的时间间隔时，爬虫才启动
@param wait_lock: 下发任务时否等待锁，若不等待锁，可能会存在多进程同时在下发一样的任务，因此分布式环境下请将该值设置True
@param task_table: 任务表， 批次爬虫传递
---------
@result:
"""
super(Scheduler, self).__init__()
for key, value in self.__class__.__custom_setting__.items():
if key == "AUTO_STOP_WHEN_SPIDER_DONE": # 兼容老版本的配置
setattr(setting, "KEEP_ALIVE", not value)
else:
setattr(setting, key, value)
self._redis_key = redis_key or setting.REDIS_KEY
if not self._redis_key:
raise Exception(
"""
redis_key 为redis中存放request与item的目录。不能为空，
可在setting中配置，如 REDIS_KEY = 'test'
或spider初始化时传参, 如 TestSpider(redis_key='test')
"""
)
self._request_buffer = RequestBuffer(redis_key)
self._item_buffer = ItemBuffer(redis_key, task_table)
self._collector = Collector(redis_key)
self._parsers = []
self._parser_controls = []
self._parser_control_obj = ParserControl
# 兼容老版本的参数
if "auto_stop_when_spider_done" in kwargs:
self._keep_alive = not kwargs.get("auto_stop_when_spider_done")
else:
self._keep_alive = (
keep_alive if keep_alive is not None else setting.KEEP_ALIVE
)
self._auto_start_requests = (
auto_start_requests
if auto_start_requests is not None
else setting.SPIDER_AUTO_START_REQUESTS
)
self._batch_interval = batch_interval
self._begin_callback = (
begin_callback
if begin_callback
else lambda: log.info("\n********** feapder begin **********")
)
self._end_callback = (
end_callback
if end_callback
else lambda: log.info("\n********** feapder end **********")
)
if thread_count:
setattr(setting, "SPIDER_THREAD_COUNT", thread_count)
self._thread_count = setting.SPIDER_THREAD_COUNT
self._spider_name = redis_key
self._project_name = redis_key.split(":")[0]
self._tab_spider_status = setting.TAB_SPIDER_STATUS.format(redis_key=redis_key)
self._tab_requests = setting.TAB_REQUESTS.format(redis_key=redis_key)
self._tab_failed_requests = setting.TAB_FAILED_REQUESTS.format(
redis_key=redis_key
)
self._is_notify_end = False # 是否已经通知结束
self._last_task_count = 0 # 最近一次任务数量
self._last_check_task_count_time = 0
self._redisdb = RedisDB()
self._project_total_state_table = "{}_total_state".format(self._project_name)
self._is_exist_project_total_state_table = False
# Request 缓存设置
Request.cached_redis_key = redis_key
Request.cached_expire_time = setting.RESPONSE_CACHED_EXPIRE_TIME
delete_keys = delete_keys or setting.DELETE_KEYS
if delete_keys:
self.delete_tables(delete_keys)
self._last_check_task_status_time = 0
self.wait_lock = wait_lock
self.init_metrics()
# 重置丢失的任务
self.reset_task()
def init_metrics(self):
"""
初始化打点系统
"""
metrics.init(**setting.METRICS_OTHER_ARGS)
def add_parser(self, parser, **kwargs):
parser = parser(**kwargs) # parser 实例化
if isinstance(parser, BaseParser):
self._parsers.append(parser)
else:
raise ValueError("类型错误，爬虫需继承feapder.BaseParser或feapder.BatchParser")
def run(self):
if not self.is_reach_next_spider_time():
return
self._start()
while True:
try:
self.heartbeat()
if self.all_thread_is_done():
if not self._is_notify_end:
self.spider_end() # 跑完一轮
self.record_spider_state(
spider_type=1,
state=1,
spider_end_time=tools.get_current_date(),
batch_interval=self._batch_interval,
)
self._is_notify_end = True
if not self._keep_alive:
self._stop_all_thread()
break
else:
self._is_notify_end = False
self.check_task_status()
except Exception as e:
log.exception(e)
tools.delay_time(1) # 1秒钟检查一次爬虫状态
def __add_task(self):
# 启动parser 的 start_requests
self.spider_begin() # 不自动结束的爬虫此处只能执行一遍
self.record_spider_state(
spider_type=1,
state=0,
batch_date=tools.get_current_date(),
spider_start_time=tools.get_current_date(),
batch_interval=self._batch_interval,
)
# 判断任务池中属否还有任务，若有接着抓取
todo_task_count = self._collector.get_requests_count()
if todo_task_count:
log.info("检查到有待做任务 %s 条，不重下发新任务，将接着上回异常终止处继续抓取" % todo_task_count)
else:
for parser in self._parsers:
results = parser.start_requests()
# 添加request到请求队列，由请求队列统一入库
if results and not isinstance(results, Iterable):
raise Exception("%s.%s返回值必须可迭代" % (parser.name, "start_requests"))
result_type = 1
for result in results or []:
if isinstance(result, Request):
result.parser_name = result.parser_name or parser.name
self._request_buffer.put_request(result)
result_type = 1
elif isinstance(result, Item):
self._item_buffer.put_item(result)
result_type = 2
elif callable(result): # callbale的request可能是更新数据库操作的函数
if result_type == 1:
self._request_buffer.put_request(result)
else:
self._item_buffer.put_item(result)
else:
raise TypeError(
"start_requests yield result type error, expect Request、Item、callback func, bug get type: {}".format(
type(result)
)
)
self._request_buffer.flush()
self._item_buffer.flush()
def _start(self):
# 启动request_buffer
self._request_buffer.start()
# 启动item_buffer
self._item_buffer.start()
# 启动collector
self._collector.start()
# 启动parser control
for i in range(self._thread_count):
parser_control = self._parser_control_obj(
self._collector,
self._redis_key,
self._request_buffer,
self._item_buffer,
)
for parser in self._parsers:
parser_control.add_parser(parser)
parser_control.start()
self._parser_controls.append(parser_control)
# 下发任务 因为时间可能比较长，放到最后面
if setting.RETRY_FAILED_REQUESTS:
# 重设失败的任务, 不用加锁，原子性操作
handle_failed_requests = HandleFailedRequests(self._redis_key)
handle_failed_requests.reput_failed_requests_to_requests()
# 下发新任务
if self._auto_start_requests: # 自动下发
if self.wait_lock:
# 将添加任务处加锁，防止多进程之间添加重复的任务
with RedisLock(key=self._spider_name) as lock:
if lock.locked:
self.__add_task()
else:
self.__add_task()
def all_thread_is_done(self):
# 降低偶然性, 因为各个环节不是并发的，很有可能当时状态为假，但检测下一条时该状态为真。一次检测很有可能遇到这种偶然性
for i in range(3):
# 检测 collector 状态
if (
self._collector.is_collector_task()
or self._collector.get_requests_count() > 0
):
return False
# 检测 parser_control 状态
for parser_control in self._parser_controls:
if not parser_control.is_not_task():
return False
# 检测 item_buffer 状态
if (
self._item_buffer.get_items_count() > 0
or self._item_buffer.is_adding_to_db()
):
return False
# 检测 request_buffer 状态
if (
self._request_buffer.get_requests_count() > 0
or self._request_buffer.is_adding_to_db()
):
return False
tools.delay_time(1)
return True
@tools.run_safe_model("check_task_status")
def check_task_status(self):
"""
检查任务状态 预警
"""
# 每分钟检查一次
now_time = time.time()
if now_time - self._last_check_task_status_time > 60:
self._last_check_task_status_time = now_time
else:
return
# 检查失败任务数量 超过1000 报警，
failed_count = self._redisdb.zget_count(self._tab_failed_requests)
if failed_count > setting.WARNING_FAILED_COUNT:
# 发送报警
msg = "《%s》爬虫当前失败任务数：%s, 请检查爬虫是否正常" % (self._spider_name, failed_count)
log.error(msg)
self.send_msg(
msg,
level="error",
message_prefix="《%s》爬虫当前失败任务数报警" % (self._spider_name),
)
# parser_control实时统计已做任务数及失败任务数，若成功率<0.5 则报警
(
failed_task_count,
success_task_count,
total_task_count,
) = ParserControl.get_task_status_count()
total_count = success_task_count + failed_task_count
if total_count > 0:
task_success_rate = success_task_count / total_count
if task_success_rate < 0.5:
# 发送报警
msg = "《%s》爬虫当前任务成功数%s, 失败数%s, 成功率 %.2f, 请检查爬虫是否正常" % (
self._spider_name,
success_task_count,
failed_task_count,
task_success_rate,
)
log.error(msg)
self.send_msg(
msg,
level="error",
message_prefix="《%s》爬虫当前任务成功率报警" % (self._spider_name),
)
# 判断任务数是否变化
current_time = tools.get_current_timestamp()
if (
current_time - self._last_check_task_count_time
> setting.WARNING_CHECK_TASK_COUNT_INTERVAL
):
if self._last_task_count and self._last_task_count == total_task_count:
# 发送报警
msg = "《{}》爬虫任务停滞 {}，请检查爬虫是否正常".format(
self._spider_name,
tools.format_seconds(
current_time - self._last_check_task_count_time
),
)
log.error(msg)
self.send_msg(
msg,
level="error",
message_prefix="《{}》爬虫任务停滞".format(self._spider_name),
)
else:
self._last_task_count = total_task_count
self._last_check_task_count_time = current_time
# 检查入库失败次数
if self._item_buffer.export_falied_times > setting.EXPORT_DATA_MAX_FAILED_TIMES:
msg = "《{}》爬虫导出数据失败，失败次数：{}， 请检查爬虫是否正常".format(
self._spider_name, self._item_buffer.export_falied_times
)
log.error(msg)
self.send_msg(
msg, level="error", message_prefix="《%s》爬虫导出数据失败" % (self._spider_name)
)
def delete_tables(self, delete_tables_list):
if isinstance(delete_tables_list, bool):
delete_tables_list = [self._redis_key + "*"]
elif not isinstance(delete_tables_list, (list, tuple)):
delete_tables_list = [delete_tables_list]
for delete_tab in delete_tables_list:
if not delete_tab.startswith(self._redis_key):
delete_tab = self._redis_key + delete_tab
tables = self._redisdb.getkeys(delete_tab)
for table in tables:
log.debug("正在删除key %s" % table)
self._redisdb.clear(table)
def _stop_all_thread(self):
self._request_buffer.stop()
self._item_buffer.stop()
# 停止 collector
self._collector.stop()
# 停止 parser_controls
for parser_control in self._parser_controls:
parser_control.stop()
self._started.clear()
def send_msg(self, msg, level="debug", message_prefix=""):
# log.debug("发送报警 level:{} msg{}".format(level, msg))
tools.send_msg(msg=msg, level=level, message_prefix=message_prefix)
def spider_begin(self):
"""
@summary: start_monitor_task 方式启动，此函数与spider_end不在同一进程内，变量不可共享
---------
---------
@result:
"""
if self._begin_callback:
self._begin_callback()
for parser in self._parsers:
parser.start_callback()
# 记录开始时间
if not self._redisdb.hexists(self._tab_spider_status, SPIDER_START_TIME_KEY):
current_timestamp = tools.get_current_timestamp()
self._redisdb.hset(
self._tab_spider_status, SPIDER_START_TIME_KEY, current_timestamp
)
# 发送消息
self.send_msg("《%s》爬虫开始" % self._spider_name)
def spider_end(self):
self.record_end_time()
if self._end_callback:
self._end_callback()
for parser in self._parsers:
if not self._keep_alive:
parser.close()
parser.end_callback()
if not self._keep_alive:
# 关闭webdirver
if Request.webdriver_pool:
Request.webdriver_pool.close()
# 关闭打点
metrics.close()
else:
metrics.flush()
# 计算抓取时长
data = self._redisdb.hget(
self._tab_spider_status, SPIDER_START_TIME_KEY, is_pop=True
)
if data:
begin_timestamp = int(data)
spand_time = tools.get_current_timestamp() - begin_timestamp
msg = "《%s》爬虫结束，耗时 %s" % (
self._spider_name,
tools.format_seconds(spand_time),
)
log.info(msg)
self.send_msg(msg)
if self._keep_alive:
log.info("爬虫不自动结束， 等待下一轮任务...")
else:
self.delete_tables(self._tab_spider_status)
def record_end_time(self):
# 记录结束时间
if self._batch_interval:
current_timestamp = tools.get_current_timestamp()
self._redisdb.hset(
self._tab_spider_status, SPIDER_END_TIME_KEY, current_timestamp
)
def is_reach_next_spider_time(self):
if not self._batch_interval:
return True
last_spider_end_time = self._redisdb.hget(
self._tab_spider_status, SPIDER_END_TIME_KEY
)
if last_spider_end_time:
last_spider_end_time = int(last_spider_end_time)
current_timestamp = tools.get_current_timestamp()
time_interval = current_timestamp - last_spider_end_time
if time_interval < self._batch_interval * 86400:
log.info(
"上次运行结束时间为 {} 与当前时间间隔 为 {}, 小于规定的抓取时间间隔 {}。爬虫不执行，退出～".format(
tools.timestamp_to_date(last_spider_end_time),
tools.format_seconds(time_interval),
tools.format_seconds(self._batch_interval * 86400),
)
)
return False
return True
def record_spider_state(
self,
spider_type,
state,
batch_date=None,
spider_start_time=None,
spider_end_time=None,
batch_interval=None,
):
pass
def join(self, timeout=None):
"""
重写线程的join
"""
if not self._started.is_set():
return
super().join()
def heartbeat(self):
self._redisdb.hset(
self._tab_spider_status, HEARTBEAT_TIME_KEY, tools.get_current_timestamp()
)
def have_alive_spider(self, heartbeat_interval=10):
heartbeat_time = self._redisdb.hget(self._tab_spider_status, HEARTBEAT_TIME_KEY)
if heartbeat_time:
heartbeat_time = int(heartbeat_time)
current_timestamp = tools.get_current_timestamp()
if current_timestamp > heartbeat_time + heartbeat_interval:
return True
return False
def reset_task(self, heartbeat_interval=10):
"""
重置丢失的任务
Returns:
"""
if self.have_alive_spider(heartbeat_interval=heartbeat_interval):
current_timestamp = tools.get_current_timestamp()
datas = self._redisdb.zrangebyscore_set_score(
self._tab_requests,
priority_min=current_timestamp,
priority_max=current_timestamp + setting.REQUEST_LOST_TIMEOUT,
score=300,
count=None,
)
lose_count = len(datas)
if lose_count:
log.info("重置丢失任务完毕，共{}条".format(len(datas)))