18 12 `12 WSGI 协议

Posted 2021-01-26 fromlantianwei

所谓wsig 协议  就是把web框架 和服务器进行分开  然后通过 wisg协议 进行连接  这样子可以随时替换web框架  或者 更换服务器 解耦 (现在学的内容里 静态连接一般是放在服务器里  而动态连接是放在web框架  不知道这句有没有错)

 

举个例子

下面是一个服务器 通过wsig 与web框架进行连接

import socket
import re
import multiprocessing
import time
import mini_frame


class WSGIServer(object):
    def __init__(self):
        # 1. 创建套接字
        self.tcp_server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        self.tcp_server_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)

        # 2. 绑定
        self.tcp_server_socket.bind(("", 7890))

        # 3. 变为监听套接字
        self.tcp_server_socket.listen(128)

    def service_client(self, new_socket):
        """为这个客户端返回数据"""

        # 1. 接收浏览器发送过来的请求 ，即http请求  
        # GET / HTTP/1.1
        # .....
        request = new_socket.recv(1024).decode("utf-8")
        # print(">>>"*50)
        # print(request)

        request_lines = request.splitlines()
        print("")
        print(">"*20)
        print(request_lines)

        # GET /index.html HTTP/1.1
        # get post put del
        file_name = ""
        ret = re.match(r"[^/]+(/[^ ]*)", request_lines[0])
        if ret:
            file_name = ret.group(1)
            # print("*"*50, file_name)
            if file_name == "/":
                file_name = "/index.html"

        # 2. 返回http格式的数据，给浏览器
        # 2.1 如果请求的资源不是以.py结尾，那么就认为是静态资源（html/css/js/png，jpg等）
        if not file_name.endswith(".py"):
            try:
                f = open("./html" + file_name, "rb")
            except:
                response = "HTTP/1.1 404 NOT FOUND
"
                response += "
"
                response += "------file not found-----"
                new_socket.send(response.encode("utf-8"))
            else:
                html_content = f.read()
                f.close()
                # 2.1 准备发送给浏览器的数据---header
                response = "HTTP/1.1 200 OK
"
                response += "
"
                # 2.2 准备发送给浏览器的数据---boy
                # response += "hahahhah"

                # 将response header发送给浏览器
                new_socket.send(response.encode("utf-8"))
                # 将response body发送给浏览器
                new_socket.send(html_content)
        else:
            # 2.2 如果是以.py结尾，那么就认为是动态资源的请求

            env = dict()  # 这个字典中存放的是web服务器要传递给 web框架的数据信息
            env[‘PATH_INFO‘] = file_name
            # {"PATH_INFO": "/index.py"}
            body = mini_frame.application(env, self.set_response_header)

            header = "HTTP/1.1 %s
" % self.status

            for temp in self.headers:
                header += "%s:%s
" % (temp[0], temp[1])

            header += "
"

            response = header+body
            # 发送response给浏览器
            new_socket.send(response.encode("utf-8"))


        # 关闭套接
        new_socket.close()

    def set_response_header(self, status, headers):
        self.status = status
        self.headers = [("server", "mini_web v8.8")]
        self.headers += headers
        

    def run_forever(self):
        """用来完成整体的控制"""

        while True:
            # 4. 等待新客户端的链接
            new_socket, client_addr = self.tcp_server_socket.accept()

            # 5. 为这个客户端服务
            p = multiprocessing.Process(target=self.service_client, args=(new_socket,))
            p.start()

            new_socket.close()


        # 关闭监听套接字
        self.tcp_server_socket.close()


def main():
    """控制整体，创建一个web 服务器对象，然后调用这个对象的run_forever方法运行"""
    wsgi_server = WSGIServer()
    wsgi_server.run_forever()


if __name__ == "__main__":
    main()

下面是通过

def index():
    return "这是主页"

def login():
    return "这是登录页面"

def application(env, start_response):
    start_response(‘200 OK‘, [(‘Content-Type‘, ‘text/html;charset=utf-8‘)])
    
    file_name = env[‘PATH_INFO‘]
    # file_name = "/index.py"

    if file_name == "/index.py":
        return index()
    elif file_name == "/login.py":
        return login()
    else:
        return ‘Hello World! 我爱你中国....‘