python编辑大文思路。
先通过f.open对象readline找到需要编辑开始和结束的字节数。
再通过mmap加偏移量映射这部分文件然后写回。
ucloud的登录图片比较简单，还是能实现自动登录的。
由于ucloud的数据库是备份全库的，所以需要编辑ucloud的数据库文件，将mysql库删除再倒入本地数据库，这就需要编辑大文件并修改，于是就有了上面的python编辑大文件。
导入的时候，可以用sed把所有imnndb替换为MyISAM加速导入
下面上代码（部分参数和url与ucloud机房有关，比如1001是ucloud A机房） 需要安装pyocr
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#!/usr/bin/python
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# -*- coding: UTF-8 -*-
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import urllib
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import urllib2
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import cookielib
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import shutil
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import os
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import sys
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import re
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import subprocess
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import pyocr
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import json
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import Image
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import time
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#import pdb
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import mmap
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import pwd
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def open_mainpage():
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#打开登录页面,初始化opener
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url_main_page = ''
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cj = cookielib.LWPCookieJar()
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opener = urllib2.build_opener(urllib2.HTTPCookieProcessor(cj))
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urllib2.install_opener(opener)
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res = urllib2.Request(url_main_page)
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req = opener.open(res)
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return opener, req.read()
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def get_lt_code(main_pages):
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#从登录页面获取LT code，这是登录时需要post的一个value
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filter_lt = re.compile('LT-[A-Za-z0-9]{20,40}')
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page_text = main_pages.strip()
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if filter_lt.search(page_text,re.X) is not None:
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return filter_lt.search(page_text).group(0)
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else:
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#print main_pages
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return ''
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def get_verification_code(opener, verification_code_file = 'D:\\Downloads\\1.png'):
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#获取验证码文件，并用pyocr解析验证码
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url_verification_code = '/verification_code'
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res = urllib2.Request(url_verification_code)
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req = opener.open(res)
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try:
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if os.path.isfile(verification_code_file):os.remove(verification_code_file)
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with open(verification_code_file, 'wb') as fp:
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shutil.copyfileobj(req, fp)
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except:
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return None
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tools = pyocr.get_available_tools()[:]
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if len(tools) == 0:
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print("No OCR tool found")
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return None
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print("Using [%s] to get key from image" % (tools[0].get_name()))
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verification_code = tools[1].image_to_string(Image.open(verification_code_file))
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return str(verification_code)
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def post_login(opener, post_data):
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url_login = ''
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for i in range(5):
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post_data['verify_code'] = get_verification_code(opener, '/tmp/1.png')
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if post_data['verify_code'] is None:
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continue
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res = urllib2.Request(url_login, urllib.urlencode(post_data))
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req = opener.open(res)
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json_response = json.loads(req.read())
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if json_response['ret_code'] == 0:
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return True
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else:
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print json_response['ret_code']
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#print json_response['error_message']
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if i == 4:
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return False
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continue
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def page_db(opener):
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#切换到dbbackup页面
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url_db = ''
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headers = {'User-Agent' : 'Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.2; Win64; x64; Trident/6.0)'}
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res = urllib2.Request(url_db, headers = headers)
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req = opener.open(res)
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#print req.read()
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def get_db_list(opener=None, db_name_list=None):
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#获取db列表
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if db_name_list is None:
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return None
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db_list = None
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#先查询本地db列表文件，如果存在不再去ucloud获取db列表
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try:
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f = open('./db.list')
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db_list_text = f.readlines()
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f.close()
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db_list = json.loads(db_list_text[0].strip())['data']
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except Exception,e:
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print 'error',e
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return None
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#不存在本地db列表，去ucloud获取
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if db_list is None or type(db_list) != type([]):
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list_url = '%d' % int(time.time()*1000)
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print 'list not ok! get url [%s]' % list_url
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try:
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#pdb.set_trace()
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res = urllib2.Request(list_url)
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req = opener.open(res)
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#print 'req is ',req.read().strip()
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json_text = req.read()
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db_list = json.loads(json_text.strip())['data']
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try:
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f = open('./db.list','w')
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f.writelines(json_text)
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f.close()
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except Exception, e:
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print 'wtfffff',e
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pass
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except Exception,e:
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print 'error open db_list url', e
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if db_list is None or type(db_list) != type([]):
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return None
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db_dict = {}
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for db in db_list:
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if db['instance_name'] in db_name_list:
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db_dict[db['instance_name']] = {}
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db_dict[db['instance_name']]['db_id'] = db['db_id']
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db_dict[db['instance_name']]['ip'] = db['virtual_ip']
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db_dict[db['instance_name']]['port'] = db['port']
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return db_dict
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def get_down_url(opener, db_dict):
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#获取db文件下载地址
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for instance_name in db_dict.keys():
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api_get_download_id = '%s&use_session=yes&format=json®ion_id=1001&zone_id=1&_=%d' % (db_dict[instance_name]['db_id'],int(time.time()*1000))
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api_get_download = ''
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#print api_get_download_id
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back_list = None
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try:
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#pdb.set_trace()
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res = urllib2.Request(api_get_download_id)
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req = opener.open(res)
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#print 'req is ',req.read().strip()
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json_text = req.read()
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back_list = json.loads(json_text.strip())['data']
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except Exception, e:
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print 'error open get download api',e
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if back_list is None:
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return None
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post_data = {'backup_id':0, 'use_session':'yes', 'format':'json', 'region_id':1001, 'zone_id':1}
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#print back_list[0],back_list[0].keys()
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if back_list[0]['dbid'] == db_dict[instance_name]['db_id']:
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post_data['backup_id'] = back_list[0]['id']
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#pdb.set_trace()
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headers = {'User-Agent' : 'Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.2; Win64; x64; Trident/6.0)',
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'X-Requested-With': 'XMLHttpRequest',
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'Referer': '',
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'Content-Type': 'application/x-www-form-urlencoded; charset=UTF-8'}
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res = urllib2.Request(api_get_download, urllib.urlencode(post_data), headers = headers)
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req = opener.open(res)
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down_md5 = req.read()
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#print len(down_md5)
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if len(down_md5) == 40:
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down_url = '%s' % down_md5
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db_dict[instance_name]['down_url'] = down_url
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def down_file_by_wget(db_dict):
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#使用wget下载db文件
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try:
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shutil.rmtree('./tmp')
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except:
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pass
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time.sleep(5)
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for instance_name in db_dict.keys():
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if 'down_url' in db_dict[instance_name].keys():
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command = '/usr/bin/wget -q %s -O ./%s.tgz' % (db_dict[instance_name]['down_url'], instance_name)
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down_process = subprocess.Popen(command,shell=True)
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down_process.wait()
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#print 'finsh download file %s,start untar' % instance_name
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command = '/bin/tar -xf %s.tgz -C ./' % (instance_name)
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#print command
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untar_process = subprocess.Popen(command,shell=True)
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untar_process.wait()
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#print 'untar finsh'
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def import_db(db_dict, max_serach_num=800,max_mysqldb_len=30):
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#将sql文件编辑修改后倒入本地数据库
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page_size = 4096
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return_value = {'code':0, 'reason':'import database success'}
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sql_files = os.listdir('./tmp/')
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if len(sql_files) != len(db_dict.keys()):
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print 'error'
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for file_name in sql_files:
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full_file_path = './tmp/' + file_name
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# delte system database mysql from sql file
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f = open(full_file_path,'r+')
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count_len = 0
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start_len = 0
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end_len = 0
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for i in range(max_serach_num):
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line = f.readline()
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count_len += len(line)
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#获取创建mysql数据库的起始位置
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if line[0:28] == "-- Current Database: `mysql`":
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print 'fine mysql len is ' + str(count_len)
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start_len = count_len
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#获取创建mysql数据库的结束位置
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if line[0:40] == "-- Dumping routines for database 'mysql'":
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end_len = count_len
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break
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if i == max_serach_num - 1:
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return_value['code'] = 1
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return_value['reason'] = 'find mysql databse start or end line fail over max'
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return return_value
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if not end_len > start_len:
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return_value['code'] = 1
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return_value['reason'] = 'find mysql databse start or end line fail'
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return return_value
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#偏移量必须是pagesize的整数倍，补全下偏移量
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completion_pagesize = start_len % page_size
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print 'cp size is %d ' % completion_pagesize
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start_len = start_len - completion_pagesize
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mmap_len = end_len - start_len
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#映射数据库文件 创建mysql的文件断
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map = mmap.mmap(f.fileno(), length=mmap_len, access = mmap.ACCESS_WRITE, offset=start_len)
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mark_start = 0
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mark_end = 0
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for i in range(max_mysqldb_len):
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mark = map.tell()
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line = map.readline()
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print line
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if line[0:28] == "-- Current Database: `mysql`":
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#创建位置标记
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mark_start = mark
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if line[0:40] == "-- Dumping routines for database 'mysql'":
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#结束位置标记
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mark_end = map.tell()
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break
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if i == max_mysqldb_len - 1 :
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return_value['code'] = 1
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return_value['reason'] = 'mysql database too large!'
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#头3字节转为注释符号
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map[mark_start:mark_start+3] = '/*\n'
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#用@填充
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for k in range(mark_start+3, mark_end):
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map[k] = '@'
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#尾3字节添加注释符号
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map[-3:mark_end] = '*/\n'
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map.flush()
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f.close()
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print 'delete databae mysql.mysql finsh!!'
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# change innodb to myisam
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command = "/bin/sed -i s/^\)\ ENGINE=InnoDB/\)\ ENGINE=MyISAM/ %s" % full_file_path
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print command
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sed_process = subprocess.Popen(command,shell=True)
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sed_process.wait()
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# import sql file
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command = '/usr/bin/mysql -uroot -S /var/lib/mysql/mysql_tmp.sock < %s' % full_file_path
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import_process = subprocess.Popen(command,shell=True)
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import_process.wait()
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return return_value
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def main():
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curuid = os.getuid()
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user_info = pwd.getpwuid(curuid)
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home_dir = user_info[5]
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user_name = user_info[0]
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crontab_dir = home_dir + '/crontab_shell/'
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try:
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os.chdir(crontab_dir)
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# print os.getcwd()
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except:
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return None
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#return None
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post_data = {}
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post_data['username'] = '帐号'
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post_data['password'] = '密码'
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post_data['verify_code'] = ''
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post_data['lt'] = ''
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post_data['service'] = ''
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global_openr = None
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global_openr, main_pages = open_mainpage()
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post_data['lt'] = get_lt_code(main_pages)
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if not post_login(global_openr, post_data):
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print 'get login faile'
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sys.exit(1)
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page_db(global_openr)
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db_name_list = ('your db 1','your db 2')
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db_dict = get_db_list(global_openr, db_name_list)
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get_down_url(global_openr, db_dict)
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print 'down load db file from ucloud'
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down_file_by_wget(db_dict)
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print 'download finsh start import db file'
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print import_db(db_dict, 5000, 5000)
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if __name__ == '__main__':
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main()
pyorc需要安装下列东西,自己打包编译
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