購物車模擬

需求：

• 根據用戶輸入輸出對應的backend下的
• server信息可添加backend 和
• sever信息可刪除backend 和sever信息
• 添加server信息時,信息與已有信息重復則不操作

說明：

• python版本為3.6
• 增刪查的結果均在haproxy.conf內可以驗證

haproxy.conf配置文件內容：

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 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 www

backend www.oldboy.org
        server 100.1.7.9 weight 20 maxconn 3000
backend www.qq.com
        server 100.1.7.10 weight 20 maxconn 3000
backend www.cnblog.com
        server 100.1.7.14 weight 20 maxconn 3000

代碼：

# /usr/bin/env python
# -*- coding: utf-8 -*-
# AUTHOR:Fio
import os
import json
arg = {
    ‘backend‘: ‘www.yahoo.com‘,
    ‘record‘: {
        ‘ip‘: ‘100.1.7.13‘,
        ‘weight‘: ‘20‘,
        ‘maxconn‘: ‘3000‘
    }
}


def select_info(url):
    flag = False
    with open(‘./haproxy.conf‘, ‘r‘) as conf:
        for line in conf:
            if line.strip().startswith("backend %s" % url):
                flag = True
                continue
            if flag:
                record_info = line.strip()
                flag = False
                print(record_info)


def insert_info(info):
    server_info = eval(info)
    url = server_info[‘backend‘]
    ip = server_info[‘record‘][‘ip‘]
    weight = server_info[‘record‘][‘weight‘]
    maxconn = server_info[‘record‘][‘maxconn‘]
    flag = False
    with open(‘./haproxy.conf‘, ‘r‘) as conf1:
        for line in conf1:
            if line.strip().startswith(‘backend %s‘ % url):
                print("配置已存在")
                flag = False
                break
            else:
                flag = True
                continue
    if flag:
        with open(‘./haproxy.conf‘, ‘a‘) as conf2:
            conf2.write(‘backend ‘ + url + ‘\n‘)
            conf2.write(‘        server %s weight %s maxconn %s\n‘ % (ip, weight, maxconn))
            print("配置%s插入成功" % url)


def delete_info(url):
    flag = False
    with open(‘./haproxy.conf‘, ‘r+‘) as conf1:
        with open(‘./haproxy_tmp.conf‘, ‘w‘) as conf2:
            for line1 in conf1:
                if line1.strip().startswith(‘backend %s‘ % url):
                    conf2.write("")
                    flag = True
                    continue
                elif flag and line1.strip().startswith(‘server‘):
                    conf2.write("")
                    flag = False
                    continue
                else:
                    conf2.write(line1)
                    continue
    os.remove(‘./haproxy.conf‘)
    os.rename(‘./haproxy_tmp.conf‘, ‘./haproxy.conf‘)
    print(‘backend %s內容已刪除‘ % url)


if __name__ == "__main__":
    print(‘‘‘
    ###############################
    #   請選擇操作方法：
    #   1.  查詢
    #   2.  插入
    #   3.  刪除
    ###############################
    ‘‘‘)
    order_num = input("選擇的序號：")
    if order_num == ‘1‘:
        URL = input("請選擇要查詢的域名：")
        select_info(URL)
    elif order_num == ‘2‘:
        INFO = input(‘‘‘請輸入完整的配置,
示例格式({    ‘backend‘: ‘www.yahoo.com‘,    ‘record‘: {        ‘ip‘: ‘100.1.7.13‘,        ‘weight‘: ‘20‘,        ‘maxconn‘: ‘3000‘    }})
：‘‘‘)
        insert_info(INFO)
    elif order_num == ‘3‘:
        URL = input("請輸入要刪除的域名配置：")
        delete_info(URL)
    else:
        print("請輸入正確的序號！")

PYTHON學習第一模塊 Haproxy配置操作