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 = []
defhandle_one_request(self): request_data = self.client_connection.recv(1024) self.request_data = request_data = request_data.decode('utf-8') # Print formatted request data a la 'curl -v' print(''.join( f'< {line}\n'for line in request_data.splitlines() ))
self.parse_request(request_data)
# 把原始的HTTP请求变成dict字典 env = self.get_environ()
# 这里就是WSGI协议部分 # 传入包含请求信息的dict对象和回调函数start_response result = self.application(env, self.start_response)
# Construct a response and send it back to the client self.finish_response(result)
defparse_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()
defget_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'] = io.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
defstart_response(self, status, response_headers, exc_info=None): # Add necessary server headers server_headers = [ ('Date', 'Mon, 15 Jul 2019 5:54:48 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
deffinish_response(self, result): try: status, response_headers = self.headers_set response = f'HTTP/1.1 {status}\r\n' for header in response_headers: response += '{0}: {1}\r\n'.format(*header) response += '\r\n' for data in result: response += data.decode('utf-8') # Print formatted response data a la 'curl -v' print(''.join( f'> {line}\n'for line in response.splitlines() )) response_bytes = response.encode() self.client_connection.sendall(response_bytes) finally: self.client_connection.close()
SERVER_ADDRESS = (HOST, PORT) = '', 8888
defmake_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') # 获取python my_wsgi_server.py后面的第一个参数 app_path = sys.argv[1] module, application = app_path.split(':') # myapp module = __import__(module) # myapp.application application = getattr(module, application) # 创建http服务器 httpd = make_server(SERVER_ADDRESS, application) print(f'WSGIServer: Serving HTTP on port {PORT} ...\n')
