select多并发socket例子：
#_*_coding:utf-8_*_
__author__ = 'Alex Li' import select
import socket
import sys
import queue server = socket.socket()
server.setblocking(0) server_addr = ('localhost',10000) print('starting up on %s port %s' % server_addr)
server.bind(server_addr) server.listen(5) inputs = [server, ] #自己也要监测呀,因为server本身也是个fd
outputs = [] message_queues = {} while True:
print("waiting for next event...") readable, writeable, exeptional = select.select(inputs,outputs,inputs) #如果没有任何fd就绪,那程序就会一直阻塞在这里 for s in readable: #每个s就是一个socket if s is server: #别忘记,上面我们server自己也当做一个fd放在了inputs列表里,传给了select,如果这个s是server,代表server这个fd就绪了,
#就是有活动了, 什么情况下它才有活动? 当然 是有新连接进来的时候 呀
#新连接进来了,接受这个连接
conn, client_addr = s.accept()
print("new connection from",client_addr)
conn.setblocking(0)
inputs.append(conn) #为了不阻塞整个程序,我们不会立刻在这里开始接收客户端发来的数据, 把它放到inputs里, 下一次loop时,这个新连接
#就会被交给select去监听,如果这个连接的客户端发来了数据 ,那这个连接的fd在server端就会变成就续的,select就会把这个连接返回,返回到
#readable 列表里,然后你就可以loop readable列表,取出这个连接,开始接收数据了, 下面就是这么干 的 message_queues[conn] = queue.Queue() #接收到客户端的数据后,不立刻返回 ,暂存在队列里,以后发送 else: #s不是server的话,那就只能是一个 与客户端建立的连接的fd了
#客户端的数据过来了,在这接收
data = s.recv(1024)
if data:
print("收到来自[%s]的数据:" % s.getpeername()[0], data)
message_queues[s].put(data) #收到的数据先放到queue里,一会返回给客户端
if s not in outputs:
outputs.append(s) #为了不影响处理与其它客户端的连接 , 这里不立刻返回数据给客户端 else:#如果收不到data代表什么呢? 代表客户端断开了呀
print("客户端断开了",s) if s in outputs:
outputs.remove(s) #清理已断开的连接 inputs.remove(s) #清理已断开的连接 del message_queues[s] ##清理已断开的连接 for s in writeable:
try :
next_msg = message_queues[s].get_nowait() except queue.Empty:
print("client [%s]" %s.getpeername()[0], "queue is empty..")
outputs.remove(s) else:
print("sending msg to [%s]"%s.getpeername()[0], next_msg)
s.send(next_msg.upper()) for s in exeptional:
print("handling exception for ",s.getpeername())
inputs.remove(s)
if s in outputs:
outputs.remove(s)
s.close() del message_queues[s]
select socket server
#_*_coding:utf-8_*_
__author__ = 'Alex Li' import socket
import sys messages = [ b'This is the message. ',
b'It will be sent ',
b'in parts.',
]
server_address = ('localhost', 10000) # Create a TCP/IP socket
socks = [ socket.socket(socket.AF_INET, socket.SOCK_STREAM),
socket.socket(socket.AF_INET, socket.SOCK_STREAM),
] # Connect the socket to the port where the server is listening
print('connecting to %s port %s' % server_address)
for s in socks:
s.connect(server_address) for message in messages: # Send messages on both sockets
for s in socks:
print('%s: sending "%s"' % (s.getsockname(), message) )
s.send(message) # Read responses on both sockets
for s in socks:
data = s.recv(1024)
print( '%s: received "%s"' % (s.getsockname(), data) )
if not data:
print(sys.stderr, 'closing socket', s.getsockname() )
select socket client
selectors模块
This module allows high-level and efficient I/O multiplexing, built upon the select module primitives. Users are encouraged to use this module instead, unless they want precise control over the OS-level primitives used.
import selectors
import socket sel = selectors.DefaultSelector() def accept(sock, mask):
conn, addr = sock.accept() # Should be ready
print('accepted', conn, 'from', addr)
conn.setblocking(False)
sel.register(conn, selectors.EVENT_READ, read) def read(conn, mask):
data = conn.recv(1000) # Should be ready
if data:
print('echoing', repr(data), 'to', conn)
conn.send(data) # Hope it won't block
else:
print('closing', conn)
sel.unregister(conn)
conn.close() sock = socket.socket()
sock.bind(('localhost', 10000))
sock.listen(100)
sock.setblocking(False)
sel.register(sock, selectors.EVENT_READ, accept) while True:
events = sel.select()
for key, mask in events:
callback = key.data
callback(key.fileobj, mask)
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import selectors
import socket
sel = selectors.DefaultSelector()
def accept(sock, mask):
conn, addr = sock.accept() # Should be ready
print('accepted', conn, 'from', addr)
conn.setblocking(False)
sel.register(conn, selectors.EVENT_READ, read)
def read(conn, mask):
data = conn.recv(1000) # Should be ready
if data:
print('echoing', repr(data), 'to', conn)
conn.send(data) # Hope it won't block
else:
print('closing', conn)
sel.unregister(conn)
conn.close()
sock = socket.socket()
sock.bind(('localhost', 10000))
sock.listen(100)
sock.setblocking(False)
sel.register(sock, selectors.EVENT_READ, accept)while True:
events = sel.select()
for key, mask in events:
callback = key.data
callback(key.fileobj, mask)
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