Python - Concurrency and Networks(socket module)

Introducing Python
Modern Computing in Simple Packages
(O'Reilly Media)
Bill Lubanovic (著)

開発環境

• OS X Yosemite - Apple (OS)
• Emacs (CUI)、BBEdit - Bare Bones Software, Inc. (GUI) (Text Editor)
• Python 3.4 (プログラミング言語)

Introducing Python: Modern Computing in Simple Packages(Bill Lubanovic (著)、 O'Reilly Media)のChapter 11(Concurrency and Networks)、Things to Do 11.1.を解いてみる。

Things to Do 11.1.

コード(Eacs, BBEdit)

server

#!/usr/bin/env python3
#-*- coding: utf-8 -*-

import datetime
import socket

server_address = ('localhost', 6789)
max_size = 4096

print('Starting the server at', datetime.datetime.now())
print('waiting for a client to call.')
server = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
server.bind(server_address)

while True:
    data, client = server.recvfrom(max_size)
    print('received', data.decode('utf-8'))
    if data == b'time':
        now = datetime.datetime.now()
        server.sendto(datetime.datetime.isoformat(now).encode('utf-8'), client)
    else:
        server.sendto(b'...', client)
server.close()

client

#!/usr/bin/env python3
#-*- coding: utf-8 -*-

import socket

server_address = ('localhost', 6789)
max_size = 4096

client = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)

s = ''
while True:
    s = input()
    if s == 'q':
        break
    client.sendto(s.encode('utf-8'), server_address)
    print('send', s)
    data, server = client.recvfrom(max_size)
    print(data.decode('utf-8'))

client.close()

    

入出力結果(Terminal, IPython)

server

$ ./sample1_server.py
Starting the server at 2015-05-07 12:52:54.901998
waiting for a client to call.
received time
received Hello
received time
  C-c C-cTraceback (most recent call last):
  File "./sample1_server.py", line 16, in <module>
    data, client = server.recvfrom(max_size)
KeyboardInterrupt
$

client

$ ./sample1_client.py 
time
send time
2015-05-07T12:53:01.192030
Hello
send Hello
...
time
send time
2015-05-07T12:53:07.429335
q
$