一，程序要求
对后台的数据（以一个文件为例）实现简单的增删改查功能，语句的语法为提示信息的示例
二，代码部分
#! /usr/bin/env python # -*- coding: utf-8 -*- # __author__ = "Jiang Feng" # Date: 2018/12/28 import os def file_processing(backend_data, type, res = None): if type == 'grep': with open('aaa', 'r') as read_f: results = [] tag = False for read_line in read_f: if read_line.strip() == backend_data: tag = True continue if tag and read_line.strip().startswith('backend'): break if tag: results.append(read_line.strip()) return results elif type == 'change': with open('aaa','r') as read_f ,open('aaa_new','w') as write_f: tag = False for read_line in read_f: if read_line.strip() == backend_data: write_f.write(read_line) tag = True for server in res: server = ' ' * 8 + server server = '%s\n' % server write_f.write(server) continue if tag and read_line.startswith('backend'): tag = False if not tag: write_f.write(read_line) os.rename('aaa', 'aaa.bak') os.rename('aaa_new', 'aaa') os.remove('aaa.bak') return '数据已经修改完成' def add(data): backend = data[0]['backend'] backend_data = 'backend %s' % backend adddata = data[0]['server'] add_list = grep(backend) if adddata in add_list: print('你想要添加的数据已经存在') else: add_list.append(adddata) return file_processing(backend_data, type='change', res=add_list) def remove(data): backend = data[0]['backend'] backend_data = 'backend %s'%backend rmdata = data[0]['server'] remove_list = grep(backend) if rmdata in remove_list: remove_list.remove(rmdata) return file_processing(backend_data, type='change', res=remove_list) else: print('你想要修改的数据不存在') def change(data): backend = data[0]['backend'] backend_data = 'backend %s'%backend old_data = data[0]['server'] new_data = data[1]['server'] grep_list = grep(backend) if not new_data or old_data not in grep_list: print('你想要修改的数据不存在') else: index = grep_list.index(old_data) grep_list[index] = new_data return file_processing(backend_data, type='change', res=grep_list) def grep(data): backend_data = 'backend %s' %data return file_processing(backend_data, type='grep') if __name__ == '__main__': tip = ''' 欢迎使用:请根据提示输入数字 1:增(例：[{'backend':'www.baidu2.com','server':'server 2.2.2.9 2.2.2.9 weight 20 maxconn 4000'}]) 2:删(例：[{'backend':'www.baidu2.com','server':'server 2.2.2.9 2.2.2.9 weight 20 maxconn 4000'}]) 3:改[{'backend':'www.baidu1.com','server':'server 10.10.10.1 10.10.10.1 weight 22 maxconn 2000'},\ {'backend':'www.baidu1.com','server':'server 10.10.10.1 10.10.10.1 weight 22 maxconn 22222'}] 4:查(例：www.baidu1.com) 5:退出 ''' msg = { '1': add, '2': remove, '3': change, '4': grep, } while True: print(tip) choice = input('请输入你的选项：') if not choice: continue if choice == '5': break data = input('请输入代码：') if choice != '4': data = eval(data) res = msg[choice](data) print(res)
三，文件中的变量
backend:为了使用查询，获得查询功能返回的列表
backend_data：为了与后台数据进行判断
file_processing：文件处理函数，为了实现程序的解耦性四，附上仿制的后台数据
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 dontlognull listen stats :8888 stats enable stats uri /admin stats auth admin:1234 frontend www.baidu.com 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 www backend www.baidu.com backend www.baidu1.com server 101.1000.7.9 101.1000.7.9 weight 20 maxconn 30 server 10.10.10.1 10.10.10.1 weight 22 maxconn 2000 server 2.2.2.5 2.2.2.5 weight 20 maxcoon 3333 server 2.2.2.7 2.2.2.7 weight 20 maxcoon 3333 backend www.baidu2.com server 3.3.3.3 3.3.3.3 weight 20 maxconn 3000 server 2.2.22.221 2.2.22.221 weight 20 maxconn 3333 backend www.baidu3.com server 10.10.0.10 10.10.0.10 weight 9999 maxconn 33333333333 server 2.2.2.111 2.2.2.111 weight 20 maxconn 3333
测试的示例代码：
增：[{'backend':'www.baidu2.com','server':'server 2.2.2.9 2.2.2.9 weight 20 maxconn 4000'}]
删例：[{'backend':'www.baidu2.com','server':'server 2.2.2.9 2.2.2.9 weight 20 maxconn 4000'}]
改：[{'backend':'www.baidu1.com','server':'server 10.10.10.1 10.10.10.1 weight 22 maxconn 2000'},{'backend':'www.baidu1.com','server':'server 10.10.10.1 10.10.10.1 weight 22 maxconn 22222'}]
查：www.baidu1.com