09.小实战03

# 查询
def serach(str):
    with open("ha.cnf", ‘r‘) as f:
        flag = False
        for line in f:
            if flag == True:
                return line
                break
            if line.strip() == "backend %s" % str:
                flag = True
    return False

# 插入
def insert(str):
    istr = eval(str)  # 将字符串转字典
    if serach(istr[‘backend‘]) == False:
        with open("ha.cnf", "a") as f:
            f.write(‘‘‘\nbackend %s \n\t\tserver %s weight %s maxconn %s‘‘‘ % (istr[‘backend‘], istr[‘server‘], istr[‘weight‘], istr[‘maxconn‘]))
    else:
        print("this line have exist!")

# 删除
def delete(str):
    if serach(str) != False:
        with open("ha.cnf", "r") as f, open("ha.temp", "w") as ftemp:
            flag = False
            for line in f:
                if line.strip() == "backend %s" % str:
                    flag = True
                else:
                    if flag != True:
                        ftemp.write(line)
                    else:
                        flag = False

# 选择操作
select = input("please select:\n 1.search 2.insert 3.delete\n")

if select == "1":
    node = input("\nnode:")
    a = serach(node)
    print(a)
elif select == "2":
    insert("{‘backend‘: ‘www.baidu.com‘, ‘server‘: ‘1.1.1.1‘, ‘weight‘: ‘20‘, ‘maxconn‘: ‘3000‘}")
elif select == "3":
    a = input("\nnode:")
    delete(a)