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python-文件操作练习-配置文件读取、修改、删除

文件操作练习:http://www.cnblogs.com/wupeiqi/articles/4950799.html

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 100.1.7.9 100.1.7.9 weight 20 maxconn 3000

backend buy.oldboy.org
        server 100.1.7.90 100.1.7.90 weight 20 maxconn 3000
复制代码

要求:

输出:
    1、获取ha记录
    2、增加ha记录
    3、删除ha记录
 
num = raw_input(‘请输入操作序号:‘)
 
如果用户输入的 1:
    read = raw_input(‘请输入backend:‘)     如输入:www.oldboy.org
    讲配置文件 backend www.oldboy.org 节点下的所有记录获取到,并输入到终端
 
如果用户输入的 2:
    read = raw_input(‘请输入要新加的记录:‘) 如: {"backend": "test.oldboy.org","record":{"server": "100.1.7.9","weight": 20,"maxconn": 30}}
    # 讲read字符串转换成 字典类型
    read_dict = json.loads(read)
 
    backend_title = read_dict[‘backend‘]
    # 去配置文件中找到指定的节点:
    # backend test.oldboy.org
    # 如果已经存在,
        # 则在此节点下添加根据用输入构造出的记录,例如:
            server 100.1.7.9 100.1.7.9 weight 20 maxconn 3000
    # 如果不存在,
        # 则添加backend节点和记录,例如:
    backend test.oldboy.org
        server 100.1.7.9 100.1.7.9 weight 20 maxconn 3000
 
    # (可选)可以再对节点下记录进行判断是否已经存在
 
如果用户输入的 3:
    read = raw_input(‘请输入要删除的记录:‘) 如: {"backend": "test.oldboy.org","record":{"server": "100.1.7.9","weight": 20,"maxconn": 30}}
    # 讲read字符串转换成 字典类型
    read_dict = json.loads(read)
    backend_title = read_dict[‘backend‘]
    #去配置文件中找到指定的节点,并在删除指定记录,如:
    backend test.oldboy.org
         server 100.1.7.10 100.1.7.10 weight 20 maxconn 3000
         server 100.1.7.9 100.1.7.9 weight 20 maxconn 3000   # 删除掉
 
    # (可选)如果backend下所有的记录都已经被删除,那么将当前 backend test.oldboy.org 也删除掉。

参考思路:

http://www.cnblogs.com/wupeiqi/articles/5539371.html

#一行一行读
f=open(xxx)
for line in f:
     print(line)

def fetch(backend):
    result=[]
    with open("ha.conf",r,encoding="utf-8") as f:
        flag = False
        for line in f:
            if line.strip().startwith("backend") and line.strip() == "backend "+backend
                flag = True
                continue
            if flag==True and line.strip().startwith("backend"):
                flag=False
                break
            if flag and line.strip():
                result.append(line.strip())
       return result       
 
def add(backend,record):
    #思路一:
#先检查记录是否存在
    record_list=fetch(backend)
    if not record_list:
        #backend不存在
        with open(ha.conf,r) as old,open("new.conf",w) as new:
            for line in old:
                new.write(line)
            new.write("backend "+backend +"\n")
            new.write(" " * 8 + record + "\n")
    else:
        #backend存在
        #如果记录存在,不用做任何操作,如果不存在,则将记录添加到backend下
        if record in record_list:
            #记录存在
            import shutil
            shutil.copy("ha.conf","new.conf")
            pass
        else:
            #backend存在,record不存在
            record_list.append(record)
            with open(ha.conf,r) as old,open("new.conf",w) as new:
                flag = False
                for line in old:
                    if line.strip().startwith("backend") and line.strip() == "backend "+backend:
                        flag = True
                        new.write(line)
                        for new_line in record_list:
                            new.write(" "*8 + new_line + "\n")
                    if flag and line.strip().startwith("backend")
                        flag = False
                        new.write(line)
                        continue
                     if line.strip() and not flag:
                         new.write(line)

bk= test.oldboy.org
rd="server 100.1.7.10 100.1.7.10 weight 20 maxconn 3000"   
add(bk,rd) 
    #思路二:


s="[11,22,33,44,55]"  #字典的表示法为s = ‘{"k1":"v1"}‘,里面元素如果是字符串的话一定要用双引号
print(type(s),s)
import json
n = json.loads(s) #将一个字符串转换为python的数据类型,[],{}
print(type(n),n)


import json
r = input("input:")
dic=json.loads(r)
bk=dic[beckend]
rd = "server %s %s weight %d maxconn %d" %(dic[record][server],
dic[record][server],dic[record][weight],dic[record][maxconn])

 

python-文件操作练习-配置文件读取、修改、删除