SocketServer.py笔记

在模块中定义__all__的作用：
只在from module import *时起作用。对from module import member没有影响。

def _eintr_retry(func, *args):
    """restart a system call interrupted by EINTR"""
    while True:
        try:
            return func(*args)
        except (OSError, select.error) as e:
            if e.args[0] != errno.EINTR:
                raise

BaseServer对外提供一些方法：
__init__
serve_forever
shutdown
handle_request() # if you do not use serve_forever()
fileno() # for select()

TCPServer UnixStreamServer
UDPServer UnixDatagramServer

ForkingMixIn ThreadingMixIn

ForkingTCPServer ForkingUDPServer
ThreadingTCPServer ThreadingUDPServer

BaseRequestHandler handle()
StreamRequestHandler
DatagramRequestHandler
其中StreamRequestHandler提供了rfile, wfile。可以通过读写文件的方式访问socket。

StringIO. This module implements a file-like class, that reads and writes string buffer(also known as memory files).
StringIO.write(‘xxx’)
StringIO.getvalue()