码迷,mamicode.com
首页 > 其他好文 > 详细

WSGI服务器实践二--实践一个基本功能的WSGI服务器

时间:2016-09-12 17:18:50      阅读:213      评论:0      收藏:0      [点我收藏+]

标签:

由于各种PYTHON框架都实现了WSGI接口,所以,通用性很广的。

在调试过程过,有一个字母拼错,搞了一个小时。

看来PYTHON自带的编辑器没有高亮,不爽。

在有提示的编辑器里一看就看了来啦。。:)

webserver.py

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)
        # Active
        listen_socket.listen(self.request_queue_size)
        # Get server host name and port
        host, port = self.listen_socket.getsockname()[0:2]
        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(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 requst data
        env = self.get_environ()

        # It‘s time to call our application callable and get
        # back a result that will become HTTP response body
        print self.application: ********************, self.application
        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_onfo=None):
        # Add necessary server headers
        server_headers = [
            (Date, Tue, 31 Mar 2015 12:54:48 GMT),
            (Server, WSGIServer 02),
            ]
        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) = ‘‘, 8888

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

wsgiapp.py

def app(environ, start_response):
    """ A barebones WSGI application.
    This is a starting point for you 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]

运行命令:

python webserver.py wsgiapp:app

结果:

技术分享

WSGI服务器实践二--实践一个基本功能的WSGI服务器

标签:

原文地址:http://www.cnblogs.com/aguncn/p/5865349.html

(0)
(0)
   
举报
评论 一句话评论(0
登录后才能评论!
© 2014 mamicode.com 版权所有  联系我们:gaon5@hotmail.com
迷上了代码!