Python简单实现Web服务器

发布时间:2019-09-17 07:43:55编辑:auto阅读(1336)

    import socket
    import re
    import gevent
    from gevent import monkey
    
     monkey.patch_all()# 识别等待时间,让协程切换
    
    def client_handler(client_socket):
        '''接收客户端链接请求,响应对应的的数据'''
        # 接收数据
        request_data = client_socket.recv(4096)
        # 判断是否接收到数据
        if not request_data:
            print("客户端已经断开链接")
            client_socket.close()
            return
    
        # 对接收到的客户端请求数据进行解码
        request_str_data = request_data.decode()
    
        #对请求的报文进行分割,分割出一个请求各行数列表
        data_list = request_str_data.split("\r\n")
    
        # 拿到请求行数据,请求行数据是列表第0个元素
        request_line = data_list[0]
    
        # 通过正则匹配到我们请求的文件路径
        result = re.match(r"\w+\s+(\S+)", request_line)
    
        # 判断匹配的请求文件路径是否存在
        if not result:
            print("请求路径不存在")
            client_socket.close()
            return
        path_info = result.group(1)
        print("用户请求信息%s" % str(path_info))
    
        # 设置请求域名默认跳转首页
        if path_info == "/":
            # 指定首页地址
            path_info = "/index.html"
    
        # 响应头
        response_header = "Server: PWS1.0\r\n"
        try:
            # 响应体,打开客户端请求的数据
            with open("./html" + path_info, "rb") as file:
                file_data = file.read()
        except Exception as e:
            # 构造请求错误响应报文
            response_line = "HTTP/1.1 404 NOT FOUND\r\n"
            response_body = "EROOR!!! %s".center(800) %(e)
    
            # 拼接响应报文
            response_data = response_line + response_header + "\r\n" + response_body
            # 给客户端发送响应报文
            client_socket.send(response_data.encode())
    
        else:
            # 构造请求成功响应报文
            response_line = "HTTP/1.1 200 OK\r\n"
            response_body = file_data
            response_data = (response_line + response_header + "\r\n").encode() + response_body
            # 发送响应报文
            client_socket.send(response_data)
    
        finally:
            # 关闭套接字
    
            client_socket.close()
    
    # 创建主函数,定义套接字
    def main():
        # 创建套接字,指定IP和数据报类型
        server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    
        # 设置端口复用
        server_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, True)
        # 设置绑定,监听,接收链接
        server_socket.bind(("", 4433))
        server_socket.listen(128)
    
        # 服务器是面向多客户,循环接收客户端请求链接
        while True:
            client_socket, client_address = server_socket.accept()
            print("服务端接收到来自%s的链接请求" % str(client_address))
            # 处理链接请求
            # client_handler(client_socket)
            # 创建协程实现多任务
            g1 = gevent.spawn(client_handler, client_socket)
            # 保持主进程存活(阻塞主进程,等待协程g1执行完再退出)
            # g1.join()
    
    # 程序入口
    if __name__ == '__main__':
        main()

    面向对象封装上面代码

    import socket
    import re
    import gevent
    from gevent import monkey
    import sys
    
    monkey.patch_all()# 识别等待时间,让协程切换
    
    class HTTPServer(object):
    
        def __init__(self, port):
            """完成实例对象的初始化操作"""
            # 创建套接字,指定IP和数据报类型
            server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    
            # 设置端口复用
            server_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, True)
            # 设置绑定,监听,接收链接
            server_socket.bind(("", 4433))
            server_socket.listen(128)
    
            # 套接字对象的引用
            self.server_socket = server_socket
    
        # 套接字的链接等待
        def start(self):
            # 服务器是面向多客户,循环接收客户端请求链接
            while True:
                client_socket, client_address = self.server_socket.accept()
                print("服务端接收到来自%s的链接请求" % str(client_address))
                # 处理链接请求
                # client_handler(client_socket)
                # 创建协程实现多任务
                g1 = gevent.spawn(self.client_handler, client_socket)
                # 保持主进程存活(阻塞主进程,等待协程g1执行完再退出)
                #g1.join()
    
        def client_handler(self, client_socket):
            '''接收客户端链接请求,响应对应的的数据'''
            # 接收数据
            request_data = client_socket.recv(4096)
            # 判断是否接收到数据
            if not request_data:
                print("客户端已经断开链接")
                client_socket.close()
                return
    
            # 对接收到的客户端请求数据进行解码
            request_str_data = request_data.decode()
    
            #对请求的报文进行分割,分割出一个请求各行数列表
            data_list = request_str_data.split("\r\n")
    
            # 拿到请求行数据,请求行数据是列表第0个元素
            request_line = data_list[0]
    
            # 通过正则匹配到我们请求的文件路径
            result = re.match(r"\w+\s+(\S+)", request_line)
    
            # 判断匹配的请求文件路径是否存在
            if not result:
                print("请求路径不存在")
                client_socket.close()
                return
            path_info = result.group(1)
            print("用户请求信息%s" % str(path_info))
    
            # 设置请求域名默认跳转首页
            if path_info == "/":
                # 指定首页地址
                path_info = "/index.html"
    
            # 响应头
            response_header = "Server: PWS1.0\r\n"
            try:
                # 响应体,打开客户端请求的数据
                with open("./html" + path_info, "rb") as file:
                    file_data = file.read()
            except Exception as e:
                # 构造请求错误响应报文
                response_line = "HTTP/1.1 404 NOT FOUND\r\n"
                response_body = "EROOR!!! %s".center(800) %(e)
    
                # 拼接响应报文
                response_data = response_line + response_header + "\r\n" + response_body
                # 给客户端发送响应报文
                client_socket.send(response_data.encode())
    
            else:
                # 构造请求成功响应报文
                response_line = "HTTP/1.1 200 OK\r\n"
                response_body = file_data
                response_data = (response_line + response_header + "\r\n").encode() + response_body
                # 发送响应报文
                client_socket.send(response_data)
    
            finally:
                # 关闭套接字
                client_socket.close()
    
    # 创建主函数,定义套接字,设置命令行自定义端口运行
    def main():
            # 判断输入命令参数是否符合要求
        if len(sys.argv) != 2:
            print("正确打开方式: python3 运行程序.py 端口号")
            return
    
        if not sys.argv[1].isdigit():
            print("正确打开方式: python3 运行程序.py 端口号")
            return
    
        port = int(sys.argv[1])
        http_server = HTTPServer(port)
        http_server.start()
    
    # 程序入口
    if __name__ == '__main__':
        main()
    

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