[同步脚本]mysql-elasticsearch同步
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!/usr/bin/env python
# coding=utf-8
import sys
sys.path.append(‘/Users/cangyufu/work_jbkj/elabels-flask‘)
from modules.utils.commons import app, redispool, db_master, db_slave
from sqlalchemy import text
import os
import datetime
import time
from service.myelasticsearch.index import es
from modules.utils.mysqldb import db_obj_dict
import datetime
CONST_SLEEP = 3
WORK_INDEX = ‘test‘
#https://stackoverflow.com/questions/136168/get-last-n-lines-of-a-file-with-python-similar-to-tail
def tail(f, lines=1):
total_lines_wanted = lines
BLOCK_SIZE = 1024
f.seek(0, 2)
block_end_byte = f.tell()
lines_to_go = total_lines_wanted
block_number = -1
blocks = [] # blocks of size BLOCK_SIZE, in reverse order starting
# from the end of the file
while lines_to_go > 0 and block_end_byte > 0:
if (block_end_byte - BLOCK_SIZE > 0):
# read the last block we haven‘t yet read
f.seek(block_number*BLOCK_SIZE, 2)
blocks.append(f.read(BLOCK_SIZE))
else:
# file too small, start from begining
f.seek(0,0)
# only read what was not read
blocks.append(f.read(block_end_byte))
lines_found = blocks[-1].count(‘\n‘)
lines_to_go -= lines_found
block_end_byte -= BLOCK_SIZE
block_number -= 1
all_read_text = ‘‘.join(reversed(blocks))
return ‘\n‘.join(all_read_text.splitlines()[-total_lines_wanted:])
def is_file_exists(filename):
if not os.path.isfile(filename):
file = open(filename, ‘wb‘)
file.write("1970-01-01 00:00:00\n")
file.close()
#传入要监控的表名
def sync_main(*args):
for table in args:
try:
callable(globals()[‘monitor_‘+table])
except Exception:
raise Exception(‘lack function monitor_{}‘.format(table))
for table in args:
filename = ‘‘.join([‘monitor_‘, table, ‘.txt‘])
locals()[table+‘path‘] = os.path.join(os.path.dirname(__file__), filename)
is_file_exists(locals()[table+‘path‘])
locals()[table+‘file‘] = open(locals()[table+‘path‘], ‘rb+‘)
try:
print "begin"
while True:
count = 0
for table in args:
print ‘handleing ‘+table
last_time = tail(locals()[table+‘file‘], 1)
update_time = globals()[‘monitor_‘+table](last_time)
print update_time
if update_time == last_time:
count += 1
continue
locals()[table + ‘file‘].write(update_time+‘\n‘)
locals()[table + ‘file‘].flush()
if count == len(args):
time.sleep(CONST_SLEEP)
except Exception, e:
print e
raise e
finally:
for table in args:
locals()[table + ‘file‘].close()
########################################################################################################################
#
# 如果要监控哪个表，必须要实现 函数 monitor_table_name，比如要监控table1表，就必须要实现monitor_table1函数，
# 传入参数为开始更新的起始时间，初始化时候为1970-01-01 00:00:00，返回更新到的最新的时间
#
########################################################################################################################
def monitor_table1(last_time):
pass
return last_time
def monitor_table2(last_time):
pass
return last_time
def trans_date_time(dt):
return datetime.datetime.strptime(dt, "%Y-%m-%d %H:%M:%S")
sync_main(‘table1‘,‘table2‘)
[同步脚本]mysql-elasticsearch同步
标签：同步 lines 开始 pat ast 网上 too and was
本文系统来源：http://www.cnblogs.com/fcyworld/p/7436093.html
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