一个简单的动态web服务器

这个动态web服务器的思路是在静态服务器的基础上添加对URL的判断，如果URL中带有脚本信息，那么服务器会去执行脚本而不是直接返回静态界面

#-*-coding:utf-8-*-
import sys
import re
from socket import *
from multiprocessing import Process

#设置静态文件根目录
HTTP_ROOT_DIR = "./html"

WSGI_PYTHON_DIR = "./wsgipython"

class HTTPServer(object):
    ''''''
    def __init__(self):
        self.tcp_socket = socket(AF_INET, SOCK_STREAM)
        self.tcp_socket.setsockopt(SOL_SOCKET, SO_REUSEADDR, 1)


    def start(self):
        self.tcp_socket.listen(128)
        while True:
            try:
                cli_socket, addrs = self.tcp_socket.accept()
                print("%s  %s:用户已连接" % (addrs[0], addrs[1]))
                p = Process(target=self.handle_client, args=(cli_socket,))
                p.start()
                cli_socket.close()
            except:
                print("服务器已经关闭")
                cli_socket.close()

        tcp_socket.close()

    def start_response(self, status, headers):
        self.response_start = "HTTP/1.1 " + status + "\r\n"
        server_headers = ""
        for header in headers:
            server_headers += "%s: %s\r\n"%header
        self.response_headers = server_headers

    def handle_client(self,cli_socket):
        # 接收数据
        request_data = cli_socket.recv(1024)
        # 解析HTTP报文协议 request_data
        print("requst_data:", request_data)

        # 处理响应数据
        request_lines = request_data.splitlines()
        print(request_lines)
        request_da = request_lines[0]
        # 获取用户想要的请求名
        file_name = re.match(r"\w+ +(/[^ ]*) ", request_da.decode("utf-8")).group(1)

        if file_name.endswith(".py"):
            # 处理py文件
            m = __import__(file_name[1:-3])
            env = {}
            response_body = m.application(env, self.start_response)
            response_start_line = self.response_start
            response_header = self.response_headers

        else:
            # 判定一下特殊情况，字符串写在左侧可以避免把“==”写成“=”时当成赋值语句
            if "/" == file_name:
                file_name = "/index.html"
            # 打开请求文件
            try:
                f = open(HTTP_ROOT_DIR + file_name, "rb")
                file_data = f.read()
                f.close()
            except IOError:
                response_start_line = "HTTP/1.1 404 Not Found\r\n"
                response_header = "Server: My server\r\n"
                response_body = "Not Found"
            else:
                # 构造响应数据
                response_start_line = "HTTP/1.1 200 OK\r\n"
                response_header = "Server: My server\r\n"
                response_body = file_data.decode("utf-8")

        response = response_start_line + response_header + "\r\n" + response_body
        print("response data:", response)

        # 发送数据
        cli_socket.send(bytes(response, "utf-8"))
        # cli_socket.send(response)

        # 关闭套接字
        cli_socket.close()
        print("链接已经断开")

    def bind(self, port):
        self.tcp_socket.bind(port)


def main():
    sys.path.insert(1,WSGI_PYTHON_DIR)
    http_server = HTTPServer()
    http_server.bind(("",8000))
    http_server.start()

if __name__ == '__main__':
    main()