第三周：HAproxy配置文件操作

作业

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

#Author xq
import os
import shutil
import time

def f_new(f_src):
    print(" 开始执行新建函数".center(60,‘*‘))
    f_input = open(‘../db/HAproxyNew‘, ‘w‘)
    with open(f_src,‘r‘,encoding=‘utf-8‘) as f_output:
        for line in f_output:
            if  line.lstrip().startswith(‘backend‘) == True:
                continue
            elif  line.lstrip().startswith(‘server‘) == True:
                continue
            else:
                f_input.write(line)
    f_input.close()
    return None

def f_dic(filename):
    backend_dic={}
    server_dic={}
    server_list=[]
    with open(filename,‘r+‘,encoding=‘utf-8‘) as f_src:
        for line in f_src:
            line=line.strip()
            if line.startswith(‘backend‘) == True:
                backend_name = line.split()[1]
            #    backend_list.append(backend_name)
                server_list = []
            elif line.startswith(‘server‘) == True:
                server_dic[‘server‘] = line.split()[1]
                server_dic[‘weight‘] = line.split()[3]
                server_dic[‘maxconn‘] = line.split()[5]
                server_list.append(server_dic.copy())
                backend_dic[backend_name] = server_list
    return backend_dic

def f_backend_list(backend_dic):
    backend_list=[]
    for k in backend_dic.keys():
        backend_name=k
        backend_list.append(backend_name)
    return  backend_list

def backend_list_show(backend_list,backend_dic):
    print("backend列表如下".center(60,‘*‘))
    backend_show_dict = {}
    for k,v in enumerate(backend_list):
        print(k,v)
        backend_show_dict[k] = v
    return backend_show_dict

def server_show(backend_show_dict,backend_dic,choice):
    print("查询结果如下".center(60,‘*‘))
    show_name=backend_show_dict[int(choice)]
    #print(backend_dic.values())
    print("backend",show_name)
    print(‘\tserver‘,backend_dic[show_name][0][‘server‘],end=‘ ‘)
    print(‘\tweight‘,backend_dic[show_name][0][‘weight‘],end=‘ ‘)
    print(‘\tmaxconn‘,backend_dic[show_name][0][‘maxconn‘],end=‘ ‘)
    print("\n",end=‘ ‘)

def backend_insert(backend_dic):
    print("增加结果如下".center(60,‘*‘))
    while True:
        i_choice=input("继续增加backend节点：y;  退出：q;")
        if i_choice == ‘y‘:
            backend_new={}
            server_list=[]
            backend_name_new=input("请输入增加的backend名称：")
            backend_new[‘server‘]=input("请输入%s下新增server值："%backend_name_new)
            backend_new[‘weight‘]=input("请输入%s下新增weight值："%backend_name_new)
            backend_new[‘maxconn‘]=input("请输入%s下新增maxconn值："%backend_name_new)
            if backend_name_new in backend_dic.keys():
                print("节点已存在")
                #if backend_new[‘server‘] in backend_dic.values():
                    #print(backend_dic[backend_name_new][0][k])
                if backend_new[‘server‘] == backend_dic[backend_name_new][0][‘server‘]:
                    print(‘IP已存在，只修改weight、maxconn的值‘)
                    backend_dic[backend_name_new][0][‘weight‘]=backend_new[‘weight‘]
                    backend_dic[backend_name_new][0][‘maxconn‘]=backend_new[‘maxconn‘]
            else:
                print("新增的server信息如下:\n%s"%backend_new)
                server_list.append(backend_new.copy())
                backend_dic[backend_name_new]=server_list
        elif i_choice == ‘q‘:
            break
        else :
            print("输入错误，请重新输入")
            continue
    print("新增操作后，字典内容",backend_dic)
    return

def backend_del(backend_show_dict,backend_dic,choice):
    print("删除结果如下".center(60,‘*‘))
    show_name=backend_show_dict[int(choice)]
    while True:
        del_choice=input("删除此backend名称：y;  删除此backend下的server信息:s； 退出：q;")
        if del_choice == ‘y‘:
            del backend_dic[show_name]
            break
        elif del_choice == ‘s‘:
            for k in backend_dic[show_name][0].keys():
                print(k, backend_dic[show_name][0][k])
                option=input("进行选择，删除:y; 跳过：p；退出：q;")
                if option == ‘y‘:
                    print(backend_dic[show_name][0])
                    backend_dic[show_name][0][k]=‘‘
                    continue
                elif option == ‘p‘:
                    continue
                elif option == ‘q‘:
                    break
                else:
                    print("输入错误，请重新输入")
                    continue
            break
        elif del_choice == ‘q‘:
            break
        else:
            print("输入错误，请重新输入")
            continue
    print("\n删除后，字典内容：",backend_dic)
    return backend_dic

def backend_update(backend_show_dict,backend_dic,choice):
    print("输入修改内容".center(60,‘*‘))
    show_name=backend_show_dict[int(choice)]
    old_name=backend_show_dict[int(choice)]
    print("backend",show_name)
    while True:
        g=input("修改此backend名称,修改：y;跳过：p;")
        if g == ‘y‘:
            backend_name_new=input("请输入新的backend名称：")
            print("修改backend名称前，字典内容",backend_dic)
            backend_dic[backend_name_new]=backend_dic.pop(old_name)# pop()如果为空则默认为-1最后一项。dict2.pop(‘name‘)删除并返回键为“name”的条目
            show_name=backend_name_new
            print("修改backend名称后，字典内容",backend_dic)
            break
        elif g == ‘p‘:
            break
        else:
            print("输入的选项格式错误，请重新输入")
            continue
    next=input("继续修改server的值，继续：y;返回：任意键;")
    if next == ‘y‘:
        for k in backend_dic[show_name][0].keys():
            print(k, backend_dic[show_name][0][k])
            option=input("进行选择，修改:y; 跳过：p；")
            if option == ‘y‘:
                backend_dic[show_name][0][k]=input("请输入新的值%s："%k)
                continue
            elif option == ‘p‘:
                continue
            else:
                print("输入的选项格式错误，请重新输入")
                continue
    else:
        print("此backend:%s修改完成"%show_name)
    print("更新后的字典：",backend_dic)
    return

def  f_Writeback(backend_dic,f_target) :
    print(" 开始执行回写函数".center(60,‘*‘))
    print(‘打印配置文件backend节点内容‘.center(50,‘-‘))
    with open(f_target,‘a+‘,encoding=‘utf-8‘) as f_input:
        for key in backend_dic.keys():
            print("\nbackend",key,file=f_input)
            print(‘\tserver‘,backend_dic[key][0][‘server‘],end=‘ ‘,file=f_input)
            print(‘\tweight‘,backend_dic[key][0][‘weight‘],end=‘ ‘,file=f_input)
            print(‘\tmaxconn‘,backend_dic[key][0][‘maxconn‘],end=‘ ‘,file=f_input)
        print("\n",end=‘ ‘)
    return None

#主程序开始
print("主程序开始，请输入您要对配置文件进行的操作".center(60,‘*‘))
b=f_dic(‘../db/HAproxy‘)
while True:
    choice = input("i:查询；o:操作（增加、删除、修改）；q:退出；请输入您的选择：")
    a=f_backend_list(b)
    if choice == ‘i‘:
        print("查询操作界面".center(100,‘#‘))
        c=backend_list_show(a,b)
        choice=input("展示此backend的server信息，请选择序号:")
        server_show(c,b,choice)
        continue
    elif choice == ‘q‘:
        f_new(‘../db/HAproxy‘)
        f_Writeback(b,‘../db/HAproxyNew‘)
        if (os.path.exists(‘../db/HAproxy‘)):
            print("文件存在，进行删除")
            os.remove(‘../db/HAproxy‘)
        os.rename(‘../db/HAproxyNew‘,‘../db/HAproxy‘)
        exit()
    elif choice == ‘o‘:
        shutil.copyfile(‘../db/HAproxy‘,‘../db/‘+‘HAproxy‘+time.strftime(‘%Y-%m-%d‘,time.localtime(time.time())))
        #输入选择
        print("请选择操作内容")
        while True:
            choice_operation = input("a:新增；u:更新；d:删除；请选择您要进行的操作：")
            if choice_operation == ‘a‘:
                print("新增操作界面".center(100,‘#‘))
                print("请输入新增内容")
                backend_insert(b)
                break
            elif choice_operation == ‘u‘:
                print("更新操作界面".center(100,‘#‘))
                c=backend_list_show(a,b)
                choice=input("请选择您要修改的backend节点:")
                backend_update(c,b,choice)
                break
            elif choice_operation == ‘d‘:
                print("删除操作界面".center(100,‘#‘))
                c=backend_list_show(a,b)#调用展示列表函数
                choice=input("请选择您要进行删除操作的backend序号:")
                backend_del(c,b,choice)
                break
            else:
                print("输入的选项格式错误，请重新输入")
                continue
        continue
    else:
        print("输入的选项格式错误，请重新输入")
        continue