使用python更新haproxy配置文件

 1 global       
 2         log 127.0.0.1 local2
 3         daemon
 4         maxconn 256
 5         log 127.0.0.1 local2 info
 6 defaults
 7         log global
 8         mode http
 9         timeout connect 5000ms
10         timeout client 50000ms
11         timeout server 50000ms
12         option  dontlognull
13 
14 listen stats :8888
15         stats enable
16         stats uri       /admin
17         stats auth      admin:1234
18 
19 frontend oldboy.org
20         bind 0.0.0.0:80
21         option httplog
22         option httpclose
23         option  forwardfor
24         log global
25         acl www hdr_reg(host) -i www.oldboy.org
26         use_backend www.oldboy.org if www
27 
28 backend www.oldboy.org
29         server 100.1.7.9 100.1.7.9 weight 20 maxconn 3000
30 
31 backend buy.oldboy.org
32         server 100.1.7.90 100.1.7.90 weight 20 maxconn 3000
33 原配置文件

 1 # -*- coding:utf-8 -*-
 2 def fetch(backend):
 3     result = []
 4     with open(‘ha.conf‘, ‘r‘) as f:
 5         flag = False
 6         for line in f:
 7             if line.strip().startswith(‘backend‘) and line.strip() == "backend " + backend:
 8                 flag = True
 9                 continue
10             if flag and line.strip().startswith(‘backend‘):
11                 break
12             if flag and line.strip():
13                 result.append(line.strip())
14 
15     return result
16 def add(backend,record):
17     record_list = fetch(backend)
18     #print (type(record_list))
19     if not record_list:
20     #1、无backend时，将旧文件全部复制到新文件中，再将查询的记录添加入新文件。
21         with open(‘ha.conf‘, ‘r‘) as old,open(‘newha.conf‘,‘w‘) as new:
22             for line in old:
23                 new.write(line)
24                 #复制
25             new.write(‘\nbackend ‘ + backend + ‘\n‘)
26             new.write(‘ ‘ * 8 + record + ‘\n‘)
27             #此两行为添加新记录（未查找到的）
28     else:
29         if record in record_list:
30         #backend存在，record也存在
31             pass
32         else:
33         #backend存在，record不存在
34             record_list.append(record)
35             #将输入的不存在的record添加入record_list
36             with open(‘ha.conf‘, ‘r‘) as old, open(‘newha.conf‘, ‘w‘) as new:
37                 flag = False
38                 for line in old:
39                     if line.strip().startswith(‘backend‘) and line.strip() == "backend " + backend:
40                         flag = True
41                         new.write(line)
42                         #将查找到的backend写入新文件
43                         for new_line in record_list:
44                             new.write(‘ ‘ * 8 + new_line + ‘\n‘)
45                             #将新记录写入新文件
46                     if flag and line.strip().startswith(‘backend‘):
47                     #下一个backend，此时flas为True
48                         flag = False
49                         #将flag重置为False
50                         new.write(line)
51                         #仅为写入其他backend文件
52                         continue
53                         #防止重复写入
54                     if line.strip() and not flag:
55                         new.write(line)
56 ret = add("www.oldboy.org",‘server 222.2.2.2 222.2.2.2 weight 22 maxconn 2222‘)