參考：https://ruslanspivak.com/lsbaws-part1/

簡單的WSGI server

server程序 webserver.py

# Tested with Python 2.7.9, Linux & Mac OS X

import socket

import StringIO

import sys

class WSGIServer(object):

address_family = socket.AF_INET

socket_type = socket.SOCK_STREAM

request_queue_size = 1

def __init__(self, server_address):

# Create a listening socket

self.listen_socket = listen_socket = socket.socket(

self.address_family,

self.socket_type

)

# Allow to reuse the same address

listen_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)

# Bind

listen_socket.bind(server_address)

# Activate

listen_socket.listen(self.request_queue_size)

# Get server host name and port

host, port = self.listen_socket.getsockname()[:2]

self.server_name = socket.getfqdn(host)

self.server_port = port

# Return headers set by Web framework/Web application

self.headers_set = []

def set_app(self, application):

self.application = application

def serve_forever(self):

listen_socket = self.listen_socket

while True:

# New client connection

self.client_connection, client_address = listen_socket.accept()

# Handle one request and close the client connection. Then

# loop over to wait for another client connection

self.handle_one_request()

def handle_one_request(self):

self.request_data = request_data = self.client_connection.recv(40960)

#self.request_data = request_data = self.client_connection.recv(1024)

# Print formatted request data a la 'curl -v'

print(''.join(

'< {line}\n'.format(line=line)

for line in request_data.splitlines()

))

self.parse_request(request_data)

# Construct environment dictionary using request data

env = self.get_environ()

# It's time to call our application callable and get

# back a result that will become HTTP response body

result = self.application(env, self.start_response)

# Construct a response and send it back to the client

self.finish_response(result)

def parse_request(self, text):

request_line = text.splitlines()[0]

request_line = request_line.rstrip('\r\n')

# Break down the request line into components

(self.request_method,? # GET

self.path,??????????? # /hello

self.request_version? # HTTP/1.1

) = request_line.split()

def get_environ(self):

env = {}

# The following code snippet does not follow PEP8 conventions

# but it's formatted the way it is for demonstration purposes

# to emphasize the required variables and their values

#

# Required WSGI variables

env['wsgi.version']????? = (1, 0)

env['wsgi.url_scheme']?? = 'http'

env['wsgi.input']??????? = StringIO.StringIO(self.request_data)

env['wsgi.errors']?????? = sys.stderr

env['wsgi.multithread']? = False

env['wsgi.multiprocess'] = False

env['wsgi.run_once']???? = False

# Required CGI variables

env['REQUEST_METHOD']??? = self.request_method??? # GET

env['PATH_INFO']???????? = self.path????????????? # /hello

env['SERVER_NAME']?????? = self.server_name?????? # localhost

env['SERVER_PORT']?????? = str(self.server_port)? # 8888

return env

def start_response(self, status, response_headers, exc_info=None):

# Add necessary server headers

server_headers = [

('Date', 'Tue, 31 Mar 2015 12:54:48 GMT'),

('Server', 'WSGIServer 0.2'),

]

self.headers_set = [status, response_headers + server_headers]

# To adhere to WSGI specification the start_response must return

# a 'write' callable. We simplicity's sake we'll ignore that detail

# for now.

# return self.finish_response

def finish_response(self, result):

try:

status, response_headers = self.headers_set

response = 'HTTP/1.1 {status}\r\n'.format(status=status)

for header in response_headers:

response += '{0}: {1}\r\n'.format(*header)

response += '\r\n'

for data in result:

response += data

# Print formatted response data a la 'curl -v'

print(''.join(

'> {line}\n'.format(line=line)

for line in response.splitlines()

))

self.client_connection.sendall(response)

finally:

self.client_connection.close()

SERVER_ADDRESS = (HOST, PORT) = '', 9091

def make_server(server_address, application):

server = WSGIServer(server_address)

server.set_app(application)

return server

if __name__ == '__main__':

if len(sys.argv) < 2:

sys.exit('Provide a WSGI application object as module:callable')

app_path = sys.argv[1]

module, application = app_path.split(':')

module = __import__(module)

application = getattr(module, application)

httpd = make_server(SERVER_ADDRESS, application)

print('WSGIServer: Serving HTTP on port {port} ...\n'.format(port=PORT))

httpd.serve_forever()

應用 test.py

def app(environ, start_response):

"""A barebones WSGI application.

This is a starting point for your own Web framework :)

"""

status = '200 OK'

response_headers = [('Content-Type', 'text/plain')]

start_response(status, response_headers)

return ['Hello world from a simple WSGI application!\n']

運行

python webserver.py test:app

測試

在瀏覽器地址欄輸入

http://192.168.3.106:9091/hello

注意:server端口設置9091，在server里可以更改

總結

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