Python学习day3作业-HAproxy配置文件操作

系统管理员 2022-07-14 03:49 157阅读 0赞

# Python days3作业-HAproxy配置文件操作 #

> 作业需求  
> HAproxy配置文件操作  
> 1. 根据用户输入，输出对应的backend下的server信息  
> 2. 可添加backend 和sever信息  
> 3. 可修改backend 和sever信息  
> 4. 可删除backend 和sever信息  
> 5. 操作配置文件前进行备份  
> 6. 添加server信息时，如果ip已经存在则修改;如果backend不存在则创建；若信息与已有信息重复则不操作

*  \[x\] 博客
 *  \[x\] 查询backend下的server信息
 *  \[x\] 添加backend和server信息
 *  \[ \] 修改backend 和sever信息
 *  \[x\] 删除backend和server信息

## 博客地址 ##

[ygqygq2的博客地址][ygqygq2]

## 基本流程图 ##

![基本流程图][20161125232120419]

## 程序代码 ##

#!/usr/bin/env python
    # _*_coding:utf-8_*_
    ''' * Created on 2016/11/7 21:24. * @author: Chinge_Yang. '''
    
    import shutil
    import json
    
    
    def list_function():
        print("Please choice the ID of a action.".center(50, "#"))
        print("【1】.Fetch haproxy.cfg backend infomation.")
        print("【2】.Add haproxy.cfg backend infomation.")
        print("【3】.Delete haproxy.cfg backend infomation.")
        print("End".center(50, "#"))
    
    
    def fetch(backend):
        # 取出backend相关server信息
        result = []  # 定义结果列表
        with open("haproxy.cfg", "r", encoding="utf-8") as f:  # 循环读取文件
            flag = False  # 标记为假
            for line in f:
                # 以backend开头
                line = line.strip()
                if line.startswith("backend") and line == "backend " + backend:
                    flag = True  # 读取到backend开头的信息，标记为真
                    continue
                # 下一个backend开头
                if flag and line.strip().startswith("backend"):
                    flag = False
                    break
                # server信息添加到result列表
                if flag and line.strip():
                    result.append(line.strip())
        return result
    
    
    def writer(backend, record_list):
        with open("haproxy.cfg", "r") as old, open("new.cfg", "w") as new:
            flag = False
            for line in old:
                if line.strip().startswith('backend') and line.strip() == "backend " + backend:
                    flag = True
                    new.write(line)
                    for new_line in record_list:
                        new.write(" " * 4 + new_line + "\n")
                    continue  # 跳到下一次循环，避免下一个backend写二次
    
                if flag and line.strip().startswith("backend"):  # 下一个backend
                    flag = False
                    new.write(line)
                    continue  # 退出此循环，避免server信息二次写入
                if line.strip() and not flag:
                    new.write(line)
    
    
    def add(backend, record):
        global change_flag
        record_list = fetch(backend)  # 查找是否存在记录
        if not record_list:  # backend不存在, record不存在
            with open('haproxy.cfg', 'r') as old, open('new.cfg', 'w') as new:
                for line in old:
                    new.write(line)
                # 添加新记录
                new.write("\nbackend " + backend + "\n")
                new.write(" " * 4 + record + "\n")
            print("\033[32;1mAdd done\033[0m")
            change_flag = True
        else:  # backend存在，record存在
            if record in record_list:
                print("\033[31;1mRecord already in it,Nothing to do!\033[0m")
                change_flag = False
            else:  # backend存在，record不存在
                record_list.append(record)
                writer(backend, record_list)
                print("\033[32;1mAdd done\033[0m")
                change_flag = True
    
    
    def delete(backend, record):
        global change_flag
        record_list = fetch(backend)  # 查找是否存在记录
        if not record_list:  # backend不存在, record不存在
            print("Not match the backend,no need delete!".center(50, "#"))
            change_flag = False
        else:  # backend存在，record存在
            if record in record_list:
                record_list.remove(record)  # 移除元素
                writer(backend, record_list)  # 写入
                print("\033[31;1mDelete done\033[0m")
                change_flag = True
            else:  # backend存在，record不存在
                print("Only match backend,no need delete!".center(50, "#"))
                change_flag = False
        return change_flag
    
    
    def output(servers):
        # 输出指定backend的server信息
        print("Match the server info:".center(50, "#"))
        for server in servers:
            print("\033[32;1m%s\033[0m" % server)
        print("#".center(50, "#"))
    
    
    def input_json():
        # 判断输入，要求为json格式
        continue_flag = False
        while continue_flag is not True:
            backend_record = input("Input backend info(json):").strip()
            try:
                backend_record_dict = json.loads(backend_record)
            except Exception as e:
                print("\033[31;1mInput not a json data type!\033[0m")
                continue
            continue_flag = True
        return backend_record_dict
    
    
    def operate(action):
        global change_flag
        if action == "fetch":
            backend_info = input("Input backend info:").strip()
            result = fetch(backend_info)  # 取出backend信息
            if result:
                output(result)  # 输出获取到的server信息
            else:
                print("\033[31;1mNot a match is found!\033[0m")
        elif action is None:
            print("\033[31;1mNothing to do!\033[0m")
        else:
            backend_record_dict = input_json()  # 要求输入json格式
            for key in backend_record_dict:
                backend = key
                record = backend_record_dict[key]
                if action == "add":
                    add(backend, record)
                elif action == "delete":
                    delete(backend, record)
            if change_flag is True:  # 文件有修改，才进行文件更新
                # 将操作结果生效
                shutil.copy("haproxy.cfg", "old.cfg")
                shutil.copy("new.cfg", "haproxy.cfg")
                result = fetch(backend)
                output(result)  # 输出获取到的server信息
    
    
    def judge_input():
        # 判断输入功能编号，执行相应步骤
        input_info = input("Your input number:").strip()
        if input_info == "1":  # 查询指定backend记录
            action = "fetch"
        elif input_info == "2":  # 添加backend记录
            action = "add"
        elif input_info == "3":  # 删除backend记录
            action = "delete"
        elif input_info == "q" or input_info == "quit":
            exit("Bye,thanks!".center(50, "#"))
        else:
            print("\033[31;1mInput error!\033[0m")
            action = None
        return action
    
    
    def main():
        exit_flag = False
        while exit_flag is not True:
            global change_flag
            change_flag = False
            list_function()
            action = judge_input()
            operate(action)
    
    
    if __name__ == '__main__':
        main()

## HAproxy配置文件操作 ##

### 1.程序说明 ###

实现功能如下

*  \[x\] 查询backend下的server信息
 *  \[x\] 添加backend和server信息
 *  \[ \] 修改backend 和sever信息
 *  \[x\] 删除backend和server信息

### 2.程序测试配置文件 ###

cat haproxy.cfg

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 51cto.com
        bind 0.0.0.0:80
        option httplog
        option httpclose
        option  forwardfor
        log global
        acl www hdr_reg(host) -i test01.example.com
        use_backend test01.example.com if www
    backend test01.example.com
        server 100.1.7.10 100.1.7.10 weight 20 maxconn 3000
    backend test.com
        server 100.1.7.90 100.1.7.90 weight 20 maxconn 3000
        server 100.1.7.66 100.1.7.66 weight 20 maxconn 3000
        server 100.1.7.27 100.1.7.27 weight 20 maxconn 3000
        server 100.1.7.13 100.1.7.13 weight 20 maxconn 3000
    
    backend www.test.com
        server 100.1.7.13 100.1.7.13 weight 20 maxconn 3000

### 3.程序测试 ###

python config\_haproxy.py  
执行结果：

########Please choice the ID of a action.#########
    【1】.Fetch haproxy.cfg backend infomation.
    【2】.Add haproxy.cfg backend infomation.
    【3】.Delete haproxy.cfg backend infomation.
    #######################End######################## Your input number:1 Input backend info:test.com ##############Match the server info:############## server 100.1.7.90 100.1.7.90 weight 20 maxconn 3000 server 100.1.7.66 100.1.7.66 weight 20 maxconn 3000 server 100.1.7.27 100.1.7.27 weight 20 maxconn 3000 ################################################## ########Please choice the ID of a action.#########
    【1】.Fetch haproxy.cfg backend infomation.
    【2】.Add haproxy.cfg backend infomation.
    【3】.Delete haproxy.cfg backend infomation.
    #######################End######################## Your input number:2 Input backend info(json):{"test.com":"testtest.com"} Add done ##############Match the server info:############## server 100.1.7.90 100.1.7.90 weight 20 maxconn 3000 server 100.1.7.66 100.1.7.66 weight 20 maxconn 3000 server 100.1.7.27 100.1.7.27 weight 20 maxconn 3000 testtest.com ################################################## ########Please choice the ID of a action.#########
    【1】.Fetch haproxy.cfg backend infomation.
    【2】.Add haproxy.cfg backend infomation.
    【3】.Delete haproxy.cfg backend infomation.
    #######################End######################## Your input number:1 Input backend info:test.com ##############Match the server info:############## server 100.1.7.90 100.1.7.90 weight 20 maxconn 3000 server 100.1.7.66 100.1.7.66 weight 20 maxconn 3000 server 100.1.7.27 100.1.7.27 weight 20 maxconn 3000 testtest.com ################################################## ########Please choice the ID of a action.#########
    【1】.Fetch haproxy.cfg backend infomation.
    【2】.Add haproxy.cfg backend infomation.
    【3】.Delete haproxy.cfg backend infomation.
    #######################End######################## Your input number:3 Input backend info(json):{"test.com":"testtest.com"} Delete done ##############Match the server info:############## server 100.1.7.90 100.1.7.90 weight 20 maxconn 3000 server 100.1.7.66 100.1.7.66 weight 20 maxconn 3000 server 100.1.7.27 100.1.7.27 weight 20 maxconn 3000 ################################################## ########Please choice the ID of a action.#########
    【1】.Fetch haproxy.cfg backend infomation.
    【2】.Add haproxy.cfg backend infomation.
    【3】.Delete haproxy.cfg backend infomation.
    #######################End######################## Your input number:4 Input error! Nothing to do! ########Please choice the ID of a action.#########
    【1】.Fetch haproxy.cfg backend infomation.
    【2】.Add haproxy.cfg backend infomation.
    【3】.Delete haproxy.cfg backend infomation.
    #######################End######################## Your input number:3 Input backend info(json):d Input not a json data type! Input backend info(json):{"test01.example.com":"server 100.1.7.27 100.1.7.27 weight 20 maxconn 3000"} ########Only match backend,no need delete!######## ########Please choice the ID of a action.#########
    【1】.Fetch haproxy.cfg backend infomation.
    【2】.Add haproxy.cfg backend infomation.
    【3】.Delete haproxy.cfg backend infomation.
    #######################End######################## Your input number:q ###################Bye,thanks!#################### Process finished with exit code 1

[ygqygq2]: http://blog.csdn.net/ygqygq2
[20161125232120419]: /images/20220714/e48a4c4558ab4476b5400ecb48305c73.png