前几天写了一下 nginx + webpy + fastcgi cache 配置详解，光配置还是不够的，启用缓存之后还需要purge缓存，今天分享下如何使用python来purge nginx的缓存。

#!/usr/bin/env python
# coding: utf-8

import socket
from config import configParser,logger
import re
from urlparse import urlparse

__author__ = 'outofmemory.cn'

purgeHost = 'outofmemory.cn'

purgeIP = '127.0.0.1'
purgePort = 80

def purge(url):
    urlParts = urlparse(url)
    page = '%s%s%s' % (urlParts.path, ('?' if urlParts.query else ''), urlParts.query or '')
    s = None
    try:
        logger.info('purge %s' %(url,))
        s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        s.connect((purgeIP, purgePort))
        s.send('GET /purge/' + page +' HTTP/1.1\nHost:' + purgeHost + '\n\n')
        data = s.recv(1024)
        ###检查是否有“404 Not Found” 或 "Successful purge" 字符串
        success = "Successful purge"
        found = "404 Not Found"
        if re.search(success,data):
            #purge success
            return 0
        elif re.search(found,data):
            #print "该页面没有被缓存<br>"
            return 1
        else:
            #print "未知错误...<br>"
            logger.error('nginx purge url response:%s' % (data,))
            return -1
    except Exception,ex:
        logger.error('nginx purge error : %s' % (ex,))
        return -1
    finally:
        if s: s.close()

这段代码使用socket来purge缓存，需要指定连接的IP和端口。这是因为在配置时指定了允许访问的IP地址，其他地址拒绝访问。