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小练习，python真的要多练习。
根据需求完成haproxy.conf配置文件的查询，新建，删除等操作。
需求：
1、查
输入：www.oldboy.org 获取当前backend下的所有记录2、新建
输入： arg = { 'bakend': 'www.oldboy.org', 'record':{ 'server': '100.1.7.9', 'weight': 20, 'maxconn': 30 } }3、删除
输入： arg = { 'bakend': 'www.oldboy.org', 'record':{ 'server': '100.1.7.9', 'weight': 20, 'maxconn': 30 } }
配置文件：
global
log 127.0.0.1 local2 daemon maxconn 256 log 127.0.0.1 local2 info defaults log global mode http timeout connect 5000ms timeout client 50000ms timeout server 50000ms option dontlognulllisten stats :8888
stats enable stats uri /admin stats auth admin:1234frontend oldboy.org
bind 0.0.0.0:80 option httplog option httpclose option forwardfor log global acl www hdr_reg(host) -i www.oldboy.org use_backend www.oldboy.org if wwwbackend www.oldboy.org
server 100.1.7.9 100.1.7.9 weight 20 maxconn 3000
代码：
#!/usr/bin/env python# _*_coding:utf-8_*_''' * Created on 2018/8/27 * @author: SJ'''import os#查询def select(domain): result_list = [] #存放查询的结果 select_flag = False #定义查询结果标志位False with open('haproxy.conf','r',encoding='utf-8') as f: for line in f: # if 语句顺序进行，当前条件判断完，进入下一判断 if line.strip()=='backend %s' % domain: #找到backend www.oldboy.org flag = True continue if line.strip().startswith('backend '): #找到下一个 backend www.xxx.com部分结束.截取其中部分 flag = False if flag == True: #截取其中部分 result_list.append(line.strip()) print(result_list) if result_list==[]: print('对不起，您查询的网址不存在!') else: return result_list#新增def add(info): arg = eval(info) #将输入的字符串转变为字典 # 根据key值调用value,并赋值 backend_title = arg.get('backend') context_title = 'backend %s' %(backend_title) record_title = arg['record'] context_record = 'server %s %s weight %s maxconn %s' % (record_title['server'],record_title['server'],record_title['weight'],record_title['maxconn']) find_flag =False #设置新增标志位 with open('haproxy.conf','r',encoding='utf-8') as f: for line in f: if line.strip()=='backend %s' % backend_title: find_flag =True continue if find_flag == True: print('已经存在!') if line.strip().startswith('backend'): flag = False else: with open('haproxy.conf','r',encoding='utf-8') as f ,\ open('haproxy.conf_new','w+',encoding='utf-8') as f_new: for line in f: f_new.write(line) #复制原始一份文件 f_new.write('\n'+context_title+'\n') new_backend = ' '*8+context_record+'\n' #赋值 f_new.write(new_backend) #写入文件 print('新建成功！') #将原始文件删除 os.rename('configuration','configuration.bak') os.rename('configuration.bak','configuration') os.remove('configuration.bak')#删除def delete(dict_info): del_backend = dict_info['backend'] #抓取value del_record= dict_info['record'] #抓取value context_title = 'backend %s' % (del_backend) context_record='server %s %s weight %s maxconn %s' %(del_record['server'],del_record['server'],del_record['weight'],del_record['maxconn']) fetch_list = select(del_backend) if not fetch_list: return else: if context_record not in fetch_list: print('你输入的信息不存在！') return else: fetch_list.remove(context_record) with open('haproxy.conf','r') as read_obj,\ open('haproxy.conf.new','w') as write_obj: flag =False has_write = False for line in read_obj: if line.strip()==context_title: flag = True continue if flag and line.startswith('backend '): flag=False if flag == True: if not has_write: print(fetch_list) for new_line in fetch_list: temp = '%s%s\n' % (' '*8,new_line) write_obj.write(temp) has_write = True else: write_obj.write(line) os.rename('configuration','configuration.bak') os.rename('configuration.bak','configuration') os.remove('configuration.bak') print('已经删除!') 转载地址：http://bblof.baihongyu.com/