Python实现简易web服务器

1、请自行了解 HTTP协议（点击跳转）

2、创建Socket服务，监听指定IP和端口

3、以阻塞方式等待客户端连接

4、读取客户端请求数据并进行解析

5、准备服务器运行上下文

6、处理客户端请求数据

7、根据用户请求路径读取文件

8、返回响应结果给客户端

9、程序入口

10、目录结构

11、运行

python wsgiserver.py app:run

12、源码

a.wsgiserver.py文件

#encoding:utf-8import socket import StringIO import sys import loggingfrom datetime import datetime logger = logging.getLogger(__name__) class WSGIServer(object):    address_family = socket.AF_INET    socket_type = socket.SOCK_STREAM    request_queue_size = 30    recv_size = 1024    def __init__(self, server_address):        self._listen_socket = _listen_socket = socket.socket(self.address_family,                                                         self.socket_type)       _listen_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR,1)       _listen_socket.bind(server_address)         _listen_socket.listen(self.request_queue_size)           _host, _port = _listen_socket.getsockname()        self._server_name = socket.getfqdn(_host)        self._server_port = _port        self._headers_set = []        self._application = None        self._client = None        self._request_data = None        self._request_method = None        self._path = None        self._request_version = None        self._start_response = None    def set_application(self, application):        self._application = application    def server_forever(self):            _listen_socket = self._listen_socket        logger.info(listen on %s:%s, self._server_name, self._server_port)      while 1:                  try:                self._client, _addr = _listen_socket.accept()                self._handle_request(_addr)            except KeyboardInterrupt as e:                logger.info(interrupt)                break            except BaseException as e:                logger.error(e)    def _handle_request(self, client_addr):        self._request_data = _request_data = self._client.recv(self.recv_size)        self._parse_request_data(_request_data)              _env = self._get_environment(client_addr)          _result = self._application(_env, self.start_response)        self._finish_response(_result)    def _parse_request_data(self, request_data):            _request_line = str(request_data.splitlines()[0]).rstrip(\r\n)        (self._request_method, self._path, self._request_version) = _request_line.split()    def _get_environment(self, client_addr):            _env = {}                _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        _env[REQUEST_METHOD] = self._request_method.upper()                _env[PATH_INFO] = self._path        _env[SERVER_NAME] = self._server_name        _env[SERVER_PORT] = self._server_port        _env[HTTP_CLIENT_IP] = client_addr[0]        logger.info(%s %s %s %s, _env[HTTP_CLIENT_IP], datetime.now().strftime(%Y-%m-%d %H:%M:%S), _env[REQUEST_METHOD], _env[PATH_INFO])        return _env    def start_response(self, status, response_headers, exc_info=None):            _server_headers = [            (Date, Sun, 7 Jun 2015 23:07:04 GMT),            (Server, WSGIServer 0.1)            ]        self._headers_set = [status, response_headers + _server_headers]    def _finish_response(self, result):            _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        self._client.sendall(_response)        self._client.close() def make_server(server_address, application):    server = WSGIServer(server_address)    server.set_application(application)    return server            if __name__ == __main__:    logging.basicConfig(level=logging.DEBUG)    server_addr= (0.0.0.0, 43002)    app_path = sys.argv[1]    module, application = app_path.split(:)    module = __import__(module)    application = getattr(module, application)    httpd = make_server(server_addr, application)    httpd.server_forever()

b.app.py文件

#encoding:utf-8import osclass PageNotFoundException(BaseException):    passdef render(filename, dirname=html):    _path = os.path.join(dirname, filename)    if os.path.exists(_path):           with open(_path, rb) as handler:                 return handler.read()                  raise PageNotFoundException(file not found:%s % _path)   def run(env, start_response):    _path = env.get(PATH_INFO)    response =    try:        _path = index.html if _path == / else _path[1:]        if _path.endswith(.css):            start_response(200 OK, [(Content-Type, text/css)])        elif _path.endswith(.js):           start_response(200 OK, [(Content-Type, text/javascript)]        elif _path.endswith(.html):            start_response(200 OK, [(Content-Type, text/html)])        else:            start_response(200 OK, [(Content-Type, text/plain), (Content-Disposition, attachment; filename=%s % os.path.basename(_path))])        response = render(_path)    except PageNotFoundException as e:        response = render(404.html)            return [response, \r\n]

 

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