Web动态服务器-基本实现

文件结构

├── web_server.py├── web│ └── my_web.py└── html └── index.html .....

web/my_web.py

import timedef application(environ, start_response): status = '200 OK' response_headers = [('Content-Type', 'text/html')] start_response(status, response_headers) return str(environ) + '==Hello world from a simple WSGI application!--->%s\n' % time.ctime()

web_server.py

import selectimport timeimport socketimport sysimport reimport multiprocessingclass WSGIServer(object): """定义一个WSGI服务器的类""" def __init__(self, port, documents_root, app): # 1. 创建套接字 self.server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM) # 2. 绑定本地信息 self.server_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) self.server_socket.bind(("", port)) # 3. 变为监听套接字 self.server_socket.listen(128) # 设定资源文件的路径 self.documents_root = documents_root # 设定web框架可以调用的函数(对象) self.app = app def run_forever(self): """运行服务器""" # 等待对方链接 while True: new_socket, new_addr = self.server_socket.accept() # 创建一个新的进程来完成这个客户端的请求任务 new_socket.settimeout(3) # 3s new_process = multiprocessing.Process(target=self.deal_with_request, args=(new_socket,)) new_process.start() new_socket.close() def deal_with_request(self, client_socket): """以长链接的方式，为这个浏览器服务器""" while True: try: request = client_socket.recv(1024).decode("utf-8") except Exception as ret: print("========>", ret) client_socket.close() return # 判断浏览器是否关闭 if not request: client_socket.close() return request_lines = request.splitlines() for i, line in enumerate(request_lines): print(i, line) # 提取请求的文件(index.html) # GET /a/b/c/d/e/index.html HTTP/1.1 ret = re.match(r"([^/]*)([^ ]+)", request_lines[0]) if ret: print("正则提取数据:", ret.group(1)) print("正则提取数据:", ret.group(2)) file_name = ret.group(2) if file_name == "/": file_name = "/index.html" # 如果不是以py结尾的文件，认为是普通的文件 if not file_name.endswith(".py"): # 读取文件数据 try: f = open(self.documents_root+file_name, "rb") except: response_body = "file not found, 请输入正确的url" response_header = "HTTP/1.1 404 not found\r\n" response_header += "Content-Type: text/html; charset=utf-8\r\n" response_header += "Content-Length: %d\r\n" % (len(response_body)) response_header += "\r\n" response = response_header + response_body # 将header返回给浏览器 client_socket.send(response.encode('utf-8')) else: content = f.read() f.close() response_body = content response_header = "HTTP/1.1 200 OK\r\n" response_header += "Content-Length: %d\r\n" % (len(response_body)) response_header += "\r\n" # 将header返回给浏览器 client_socket.send(response_header.encode('utf-8') + response_body) # 以.py结尾的文件，就认为是浏览需要动态的页面 else: # 准备一个字典，里面存放需要传递给web框架的数据 env = {} # 存web返回的数据 response_body = self.app(env, self.set_response_headers) # 合并header和body response_header = "HTTP/1.1 {status}\r\n".format(status=self.headers[0]) response_header += "Content-Type: text/html; charset=utf-8\r\n" response_header += "Content-Length: %d\r\n" % len(response_body) for temp_head in self.headers[1]: response_header += "{0}:{1}\r\n".format(*temp_head) response = response_header + "\r\n" response += response_body client_socket.send(response.encode('utf-8')) def set_response_headers(self, status, headers): """这个方法，会在 web框架中被默认调用""" response_header_default = [ ("Data", time.ctime()), ("Server", "ItCast-python mini web server") ] # 将状态码/相应头信息存储起来 # [字符串, [xxxxx, xxx2]] self.headers = [status, response_header_default + headers]# 设置静态资源访问的路径g_static_document_root = "./html"# 设置动态资源访问的路径g_dynamic_document_root = "./web"def main(): """控制web服务器整体""" # python3 xxxx.py 7890 if len(sys.argv) == 3: # 获取web服务器的port port = sys.argv[1] if port.isdigit(): port = int(port) # 获取web服务器需要动态资源时，访问的web框架名字 web_frame_module_app_name = sys.argv[2] else: print("运行方式如: python3 xxx.py 7890 my_web_frame_name:application") return print("http服务器使用的port:%s" % port) # 将动态路径即存放py文件的路径，添加到path中，这样python就能够找到这个路径了 sys.path.append(g_dynamic_document_root) ret = re.match(r"([^:]*):(.*)", web_frame_module_app_name) if ret: # 获取模块名 web_frame_module_name = ret.group(1) # 获取可以调用web框架的应用名称 app_name = ret.group(2) # 导入web框架的主模块 web_frame_module = __import__(web_frame_module_name) # 获取那个可以直接调用的函数(对象) app = getattr(web_frame_module, app_name)  # print(app) # for test # 启动http服务器 http_server = WSGIServer(port, g_static_document_root, app) # 运行http服务器 http_server.run_forever()if __name__ == "__main__": main()

1. 打开终端，输入以下命令开始服务器

python3 web_server.py my_web:application

2. 打开浏览器