eventlet绿化和patch原理
说明
eventlet是一个必备工具,经常用,绿化原理有点忘记了,重新复习一遍.
三个主要问题
1. 绿化的原理是什么?
2. 绿化怎么管理?
3. 绿化怎么引入?
绿化原理
利用select/epolls/kqueue等操作系统提供的非阻塞操作,将阻塞改为非阻塞.
引用管理
eventlet在import之后,将模块中的属性绿化.
用一小段代码来查看看
import sys import eventlet # eventlet.monkey_patch() httplib2 = eventlet.import_patched('httplib2') print(httplib2) print(httplib2.socket) print("================") for k,v in sys.modules.items(): if "socket" in k: print(k, v) # 打印内容 <module 'httplib2' from 'D:\\workspace\\venv\\xxx\\lib\\site-packages\\httplib2\\__init__.py'> <module 'eventlet.green.socket' from 'D:\\workspace\\venv\\xxx\\lib\\site-packages\\eventlet\\green\\socket.py'> ================ _socket <module '_socket' from 'c:\\python\\python36\\DLLs\\_socket.pyd'> socket <module 'socket' from 'c:\\python\\python36\\lib\\socket.py'> __original_module_socket <module 'socket' from 'c:\\python\\python36\\lib\\socket.py'> # 说明了什么? 绿化只是替换httplib2模块中的引用属性socket。并未改变sys.modules中的属性
引入绿化方法一:直接import
from eventlet.green import socket
引入绿化方法二:eventlet.import_patch
1.好处: 能绿化模块内部的系统模块
2.只能绿化os, select, socket, thread, time, psycopy, MySQLdb, bultines, subprocess
3.如果是import threading,不会自动绿化, 需要from eventlet.green import threading
import eventlet httplib2 = eventlet.import_patched('httplib2') print(httplib2) print(httplib2.socket) # 打印 <module 'httplib2' from 'D:\\workspace\\venv\\autumn-secs\\lib\\site-packages\\httplib2\\__init__.py'> <module 'eventlet.green.socket' from 'D:\\workspace\\venv\\autumn-secs\\lib\\site-packages\\eventlet\\green\\socket.py'>
引入绿化方法三:eventlet.monkey_patch
1.与import_patch不同,会直接修改sys.modules
2.但是也只能绿化os,select等等几个模块,其它模块需要用直接引用绿化
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