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test_server.py
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test_server.py
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#!/usr/bin/env python3
import socket
import types
import selectors
sel = selectors.DefaultSelector()
def accept_wrapper(sock):
conn, addr = sock.accept() # Should be ready to read
print('accepted connection from', addr)
conn.setblocking(False)
data = types.SimpleNamespace(addr=addr, inb=b"", outb=b"")
events = selectors.EVENT_READ | selectors.EVENT_WRITE
sel.register(conn, events, data=data)
def service_connection(key, mask):
sock = key.fileobj
data = key.data
if mask & selectors.EVENT_READ:
recv_data = sock.recv(1024) # Should be ready to read
if recv_data:
data.outb += recv_data
else:
print('closing connection to', data.addr)
sel.unregister(sock)
sock.close()
if mask & selectors.EVENT_WRITE:
if data.outb:
print('echoing', repr(data.outb), 'to', data.addr)
sent = sock.send(data.outb) # Should be ready to write
data.outb = data.outb[sent:]
host = '127.0.0.1' # Standard loopback interface address (localhost)
port = 65432 # Port to listen on (non-privileged ports are > 1023)
lsock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
lsock.bind((host, port))
lsock.listen()
print('listening on', (host, port))
lsock.setblocking(False)
sel.register(lsock, selectors.EVENT_READ, data=None)
while True:
events = sel.select(timeout=None)
for key, mask in events:
if key.data is None:
accept_wrapper(key.fileobj)
else:
service_connection(key, mask)