修改haproxy配置文件

def search():       #查找域名函数
    """
    1.readlines将内容变成一个列表
    2.找到域名对应的索引
    3.域名接下来几行是具体的服务器信息，利用上面索引循环加1遍历
    """
    url = 'www.oldboy.net'
    url_title = 'backend %s
' % url
    with open('haproxy.txt','r') as f:
        f_read = f.readlines()
        if url_title in f_read:
            index = f_read.index(url_title)
            print(f_read[index])
            index = index + 1
            while index < len(f_read):
                # print(len(f_read))
                if 'weight' in f_read[index] :
                    print(f_read[index])
                    index+=1
                else:
                    break
        else:
            exit('没有此域名')

def modifeild():  #删除
    """
    1.利用上面查找的方法，先把域名对应条目索引取出放在一个列表中
    2.再将老文件内容逐行写入新文件，当索引在上面列表时就忽略不写入,(然后把旧文件删除，新文件改成旧文件名，这部分没写)
    """
    url = 'www.oldboy.ne'
    url_title = 'backend %s
' % url
    index_list = []
    with open('haproxy.txt', 'r') as f,open('haproxynew.txt', 'w+') as fnew:
        f_read = iter(f.readlines())
        if url_title in f_read:
            index = f_read.index(url_title)
            print(f_read[index])
            index_list.append(index)
            print(index_list)
            index = index + 1
            while index < len(f_read):
                # print(len(f_read))
                if 'weight' in f_read[index]:
                    index_list.append(index)
                    print(f_read[index])
                    print(index_list)
                    index += 1
            else:
                for i,line in enumerate(f_read):
                    if i in index_list:
                        pass
                    else:
                        fnew.write(line)
        else:
            exit('没有此域名')

def add():      #新增
    '''"
    首次新增时，域名和服务器信息一起添加，再次添加时，只添加服务器信息
    """
    url = 'www.baidu.com'
    url_title = 'backend www.baidu.com
'
    server = '1.1.1.3'
    weight = '30'
    maxconn = '3000'
    with open('haproxy.txt', 'r+') as f:
        f_read = f.readlines()
        print(f_read)
        if url_title in f_read:
            content = "		server {} {} weight {} maxconn {}
" 
                .format(server, server, weight, maxconn)
            print(content)
            f.write(content)
        else:
            print(url_title)
            f.write('
')
            f.write(url_title)
            content = "		server {} {} weight {} maxconn {}
" 
                .format(server, server, weight, maxconn)
            print(content)
            f.write(content)