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picker.py
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picker.py
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#!/usr/bin/python
#coding=utf-8
""" Filename: picker.py """
import sys
import threading
import time
import logging
import json
import net
from pylib import util, sql, expath, spider
reload(sys)
sys.setdefaultencoding("utf-8")
CONFIG = None
def check_must_key(p_config, ret):
for key in p_config["must_key"]:
if not ret[key]:
return False
return True
def print_for_test(ret):
print "#"*30
if isinstance(ret, list):
for items in ret:
print "="*20
for key, val in items.items():
print key, val
elif isinstance(ret, dict):
for key, val in ret.items():
print key, val
###################################################################################
### Process Control
###################################################################################
class Picker(threading.Thread):
def __init__(self, num, work_as="crawl"):
threading.Thread.__init__(self)
self._num = num
self._work_as = work_as
self._redis = util.get_redis_client(CONFIG.G_REDIS)
self._sql = sql.Sql(CONFIG.G_MYSQL, CONFIG.G_MAINDB, assoc=True)
util.log_config(CONFIG.G_PICK_LOG)
def _db_had(self, check_list, table_cfg):
self._sql.check_connect()
table = table_cfg["name"]
division = table_cfg["division"]
if division == 16 or division == 256:
ret_dict = {}
list_dict = {}
for md5 in check_list:
flag = md5[-1:] if division == 16 else md5[-2:]
if flag in list_dict:
list_dict[flag].append(md5)
else:
list_dict[flag] = [md5]
for key in list_dict:
has = self._sql.exist(table + key, list_dict[key], "md5")
ret_dict.update(has)
return ret_dict
else:
return self._sql.exist(table, check_list, "md5")
def _html_from_db(self, md5, table_cfg):
self._sql.check_connect()
table = table_cfg["name"]
division = table_cfg["division"]
if division == 16 or division == 256:
flag = md5[-1:] if division == 16 else md5[-2:]
row = self._sql.select(table + flag, ["html"], {"md5":md5}, one=True)
else:
row = self._sql.select(table, ["html"], {"md5":md5}, one=True)
if row:
return row["html"]
else:
return None
def _data2redis_sql(self, sqldata, table_cfg, op_type):
table = table_cfg["name"]
division = table_cfg["division"]
sql.data2redis(self._redis, CONFIG.G_SQL_QUEUE, \
table, op_type, sqldata, "md5", division)
def _pick_state(self, md5, state, table_cfg):
self._data2redis_sql({"md5":md5, "pick_state":state}, table_cfg, "update")
#保存html页面到数据库， 分为详情页和过程页，保存可配置
def _save_html(self, md5, html, d_config):
if CONFIG.G_IFSAVE_HTML == False:
return
dcode = d_config["config"]["default_code"]
html = spider.html2utf8(html, dcode)
item = {"md5":md5, "html":html}
table = CONFIG.G_TABLE_HTML["name"]
division = CONFIG.G_TABLE_HTML["division"]
if not self._db_had(CONFIG.G_TABLE_HTML, {"md5":md5}):
sql.data2redis(self._redis, CONFIG.G_SQL_QUEUE, table,\
"insert", item, "md5", division)
else:
sql.data2redis(self._redis, CONFIG.G_SQL_QUEUE, table,\
"update", item, "md5", division)
def _deal_pick_ret(self, ret, url, md5, table_cfg):
#查内容是否在库里，根据情况执行插入或更新
ret_count = 0
insert_count = 0
update_count = 0
if isinstance(ret, list):
#提取结果是队列的情况
ret_count = len(ret)
check_list = []
for i in range(0, len(ret)):
ret[i]["md5"] = util.md5(ret[i]["url"])
check_list.append(ret[i]["md5"])
check_ret = self._db_had(check_list, table_cfg)
for data in ret:
if data["md5"] in check_ret and self._work_as == "update":
self._data2redis_sql(data, table_cfg, "update")
update_count += 1
else:
self._data2redis_sql(data, table_cfg, "insert")
insert_count += 1
elif isinstance(ret, dict):
#提取结果是字典的情况
ret_count = 1
ret["url"] = url
ret["md5"] = md5
if self._db_had({"md5":md5}, table_cfg):
if self._work_as == "update":
self._data2redis_sql(ret, table_cfg, "update")
update_count += 1
else:
self._data2redis_sql(ret, table_cfg, "insert")
insert_count += 1
if ret:
self._pick_state(md5, CONFIG.G_STATE_PICKED, CONFIG.G_TABLE_LINK)
if self._work_as == "update":
return (update_count, ret_count)
else:
return (insert_count, ret_count)
def _pick(self, d_config, html, task_data, default_code):
md5 = task_data["md5"]
url = task_data["url"]
page_type = task_data["type"]
#根据xpath配置提取html里的信息
p_config = d_config["picker"][page_type]
table_cfg = CONFIG.G_TABLE_INFO
if "table" in p_config:
table_cfg = p_config["table"]
picker = expath.XPath(url, html, default_code)
xpath_config = p_config["path"]
ret = picker.pick(xpath_config)
ret = self.ext_before_db(ret, url, html)
if self._work_as == "test":
print_for_test(ret)
return (0, len(ret))
#检查必需有值的字段是否有值
if not check_must_key(p_config, ret):
self._pick_state(md5, CONFIG.G_STATE_ERROR, CONFIG.G_TABLE_LINK)
return (0, 0)
return self._deal_pick_ret(ret, url, md5, table_cfg)
def ext_before_pick(self, html, url):
#在提取前执行
return html
def ext_before_db(self, ret, url, html):
#在入库前执行
return ret
def _run(self, task_data):
url = task_data["url"]
domain = url.split("/")[2]
d_config = CONFIG.G_SITE[domain]
default_code = d_config["default_code"]
html = None
if CONFIG.G_IFSAVE_HTML == True:
html = self._html_from_db(task_data["md5"], CONFIG.G_TABLE_HTML)
if html:
default_code = "utf-8"
if not html:
(header, html) = net.get(url, d_config=d_config)
if not header["code"] == 200:
self._pick_state(task_data["md5"],\
CONFIG.G_STATE_ERROR, CONFIG.G_TABLE_LINK)
return (CONFIG.G_STATE_NET_ERROR, (0, 0))
self.ext_before_pick(html, url)
count = self._pick(d_config, html, task_data, default_code)
return (CONFIG.G_STATE_PICKED, count)
def run(self):
while True:
url = ""
try:
item = self._redis.rpop(CONFIG.G_PICK_QUEUE)
if not item:
time.sleep(5)
continue
task_data = json.loads(item)
(state, count) = self._run(task_data)
md5 = task_data["md5"]
url = task_data["url"]
if count[1] != 0:
logging.info("[PickOk][%d][%d]:%s %s", \
count[0], count[1], md5, url)
else:
logging.info("[PickFail]: %d %s", state, url)
except Exception, msg:
logging.exception("[PickFail]:[except] " + url)
logging.exception("[PickFail]:[except] " + str(msg))
if "MySQL" in str(msg):
self._sql.check_connect()