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Develop a custom Web framework

Receive dynamic resource requests from the web server and provide the web server with services for processing dynamic resource requests. Determine based on the suffix name of the requested resource path:

If the suffix name of the requested resource path is .html, it is a dynamic resource request, and let the web framework program handle it.

Otherwise it is a static resource request, let the web server program handle it.

1. Develop the main program of the Web server

1. Accept the client HTTP request (the bottom layer is TCP)

# -*- coding: utf-8 -*-
# @File  : My_Web_Server.py
# @author: Flyme awei 
# @email : 1071505897@qq.com
# @Time  : 2022/7/24 21:28


from socket import *
import threading


# 开发自己的Web服务器主类
class MyHttpWebServer(object):

    def __init__(self, port):
        # 创建 HTTP服务的 TCP套接字
        server_socket = socket(AF_INET, SOCK_STREAM)
        # 设置端口号互用,程序退出之后不需要等待,直接释放端口
        server_socket.setsockopt(SOL_SOCKET, SO_REUSEADDR, True)
        # 绑定 ip和 port
        server_socket.bind(('', port))
        # listen使套接字变为了被动连接
        server_socket.listen(128)
        self.server_socket = server_socket

    # 处理请求函数
    @staticmethod  # 静态方法
    def handle_browser_request(new_socket):
        # 接受客户端发来的数据
        recv_data = new_socket.recv(4096)
        # 如果没有数据,那么请求无效,关闭套接字,直接退出
        if len(recv_data) == 0:
            new_socket.close()
            return
            
# 启动服务器,并接受客户端请求
    def start(self):
        # 循环并多线程来接收客户端请求
        while True:
            # accept等待客户端连接
            new_socket, ip_port = self.server_socket.accept()
            print("客户端ip和端口", ip_port)
            # 一个客户端的请求交给一个线程来处理
            sub_thread = threading.Thread(target=MyHttpWebServer.handle_browser_request, args=(new_socket, ))
            # 设置当前线程为守护线程
            sub_thread.setDaemon(True)
            sub_thread.start()  # 启动子线程


# Web 服务器程序的入口
def main():
    web_server = MyHttpWebServer(8080)
    web_server.start()


if __name__ == '__main__':
    main()

2. Determine whether the request is a static resource or a dynamic resource

 # 对接收的字节数据进行转换为字符数据
        request_data = recv_data.decode('utf-8')
        print("浏览器请求的数据:", request_data)
        request_array = request_data.split(' ', maxsplit=2)

        # 得到请求路径
        request_path = request_array[1]
        print("请求的路径是:", request_path)
        if request_path == "/":
            # 如果请求路径为根目录,自动设置为:/index.html
            request_path = "/index.html"
        # 判断是否为:.html 结尾
        if request_path.endswith(".html"):
            "动态资源请求"
           pass
        else:
            "静态资源请求"
            pass

3. How to deal with static resources?

How to use Python to develop a custom web framework

"静态资源请求"
            # 根据请求路径读取/static 目录中的文件数据,相应给客户端
            response_body = None  # 响应主体
            response_header = None  # 响应头的第一行
            response_first_line = None  # 响应头内容
            response_type = 'test/html'  # 默认响应类型
            try:
                # 读取 static目录中相对应的文件数据,rb模式是一种兼容模式,可以打开图片,也可以打开js
                with open('static'+request_path, 'rb') as f:
                    response_body = f.read()
                if request_path.endswith('.jpg'):
                    response_type = 'image/webp'

                response_first_line = 'HTTP/1.1 200 OK'
                response_header = 'Content-Length:' + str(len(response_body)) + '\r\n' + \
                                  'Content-Type: ' + response_type + '; charset=utf-8\r\n' + \
                                  'Date:' + time.strftime('%Y-%m-%d %H:%M:%S', time.localtime()) + '\r\n' + \
                                  'Server: Flyme awei Server\r\n'

            # 浏览器读取的文件可能不存在
            except Exception as e:
                with open('static/404.html', 'rb') as f:
                    response_body = f.read()  # 响应的主体页面内容
                # 响应头
                response_first_line = 'HTTP/1.1 404 Not Found\r\n'
                response_header = 'Content-Length:'+str(len(response_body))+'\r\n' + \
                                  'Content-Type: text/html; charset=utf-8\r\n' + \
                                  'Date:' + time.strftime('%Y-%m-%d %H:%M:%S', time.localtime()) + '\r\n' + \
                                  'Server: Flyme awei Server\r\n'
            # 最后都会执行的代码
            finally:
                # 组成响应数据发送给(客户端)浏览器
                response = (response_first_line + response_header + '\r\n').encode('utf-8') + response_body
                new_socket.send(response)
                # 关闭套接字
                new_socket.close()

How to use Python to develop a custom web framework

Static resource request verification:

How to use Python to develop a custom web framework

4. If dynamic resources How to deal with it

if request_path.endswith(".html"):
            "动态资源请求"
            # 动态资源的处理交给Web框架来处理,需要把请求参数交给Web框架,可能会有多个参数,采用字典结构
            params = {
                'request_path': request_path
            }
            # Web框架处理动态资源请求后,返回一个响应
            response = MyFramework.handle_request(params)
            new_socket.send(response)
            new_socket.close()

5. Close the Web server

new_socket.close()

The total code display of the Web server main framework:

# -*- coding: utf-8 -*-
# @File  : My_Web_Server.py
# @author: Flyme awei 
# @email : 1071505897@qq.com
# @Time  : 2022/7/24 21:28


import sys
import time
from socket import *
import threading
import MyFramework


# 开发自己的Web服务器主类
class MyHttpWebServer(object):

    def __init__(self, port):
        # 创建 HTTP服务的 TCP套接字
        server_socket = socket(AF_INET, SOCK_STREAM)
        # 设置端口号互用,程序退出之后不需要等待,直接释放端口
        server_socket.setsockopt(SOL_SOCKET, SO_REUSEADDR, True)
        # 绑定 ip和 port
        server_socket.bind(('', port))
        # listen使套接字变为了被动连接
        server_socket.listen(128)
        self.server_socket = server_socket

    # 处理请求函数
    @staticmethod  # 静态方法
    def handle_browser_request(new_socket):
        # 接受客户端发来的数据
        recv_data = new_socket.recv(4096)
        # 如果没有数据,那么请求无效,关闭套接字,直接退出
        if len(recv_data) == 0:
            new_socket.close()
            return

        # 对接收的字节数据进行转换为字符数据
        request_data = recv_data.decode('utf-8')
        print("浏览器请求的数据:", request_data)
        request_array = request_data.split(' ', maxsplit=2)

        # 得到请求路径
        request_path = request_array[1]
        print("请求的路径是:", request_path)
        if request_path == "/":
            # 如果请求路径为根目录,自动设置为:/index.html
            request_path = "/index.html"
        # 判断是否为:.html 结尾
        if request_path.endswith(".html"):
            "动态资源请求"
            # 动态资源的处理交给Web框架来处理,需要把请求参数交给Web框架,可能会有多个参数,采用字典结构
            params = {
                'request_path': request_path
            }
            # Web框架处理动态资源请求后,返回一个响应
            response = MyFramework.handle_request(params)
            new_socket.send(response)
            new_socket.close()
        else:
            "静态资源请求"
            # 根据请求路径读取/static 目录中的文件数据,相应给客户端
            response_body = None  # 响应主体
            response_header = None  # 响应头的第一行
            response_first_line = None  # 响应头内容
            response_type = 'test/html'  # 默认响应类型
            try:
                # 读取 static目录中相对应的文件数据,rb模式是一种兼容模式,可以打开图片,也可以打开js
                with open('static'+request_path, 'rb') as f:
                    response_body = f.read()
                if request_path.endswith('.jpg'):
                    response_type = 'image/webp'

                response_first_line = 'HTTP/1.1 200 OK'
                response_header = 'Content-Length:' + str(len(response_body)) + '\r\n' + \
                                  'Content-Type: ' + response_type + '; charset=utf-8\r\n' + \
                                  'Date:' + time.strftime('%Y-%m-%d %H:%M:%S', time.localtime()) + '\r\n' + \
                                  'Server: Flyme awei Server\r\n'

            # 浏览器读取的文件可能不存在
            except Exception as e:
                with open('static/404.html', 'rb') as f:
                    response_body = f.read()  # 响应的主体页面内容
                # 响应头
                response_first_line = 'HTTP/1.1 404 Not Found\r\n'
                response_header = 'Content-Length:'+str(len(response_body))+'\r\n' + \
                                  'Content-Type: text/html; charset=utf-8\r\n' + \
                                  'Date:' + time.strftime('%Y-%m-%d %H:%M:%S', time.localtime()) + '\r\n' + \
                                  'Server: Flyme awei Server\r\n'
            # 最后都会执行的代码
            finally:
                # 组成响应数据发送给(客户端)浏览器
                response = (response_first_line + response_header + '\r\n').encode('utf-8') + response_body
                new_socket.send(response)
                # 关闭套接字
                new_socket.close()

    # 启动服务器,并接受客户端请求
    def start(self):
        # 循环并多线程来接收客户端请求
        while True:
            # accept等待客户端连接
            new_socket, ip_port = self.server_socket.accept()
            print("客户端ip和端口", ip_port)
            # 一个客户端的请求交给一个线程来处理
            sub_thread = threading.Thread(target=MyHttpWebServer.handle_browser_request, args=(new_socket, ))
            # 设置当前线程为守护线程
            sub_thread.setDaemon(True)
            sub_thread.start()  # 启动子线程


# Web 服务器程序的入口
def main():
    web_server = MyHttpWebServer(8080)
    web_server.start()


if __name__ == '__main__':
    main()

2. Develop the main program of the Web framework

1. According to the request path, dynamically respond to the corresponding data

# -*- coding: utf-8 -*-
# @File  : MyFramework.py
# @author: Flyme awei 
# @email : 1071505897@qq.com
# @Time  : 2022/7/25 14:05

import time

# 自定义Web框架


# 处理动态资源请求的函数
def handle_request(parm):
    request_path = parm['request_path']

    if request_path == '/index.html':  # 当前请求路径有与之对应的动态响应,当前框架只开发了 index.html的功能
        response = index()
        return response
    else:
        # 没有动态资源的数据,返回404页面
        return page_not_found()


# 当前 index函数,专门处理index.html的请求
def index():
    # 需求,在页面中动态显示当前系统时间
    data = time.strftime('%Y-%m-%d %H:%M:%S', time.localtime())
    response_body = data
    response_first_line = 'HTTP/1.1 200 OK\r\n'
    response_header = 'Content-Length:' + str(len(response_body)) + '\r\n' + \
                      'Content-Type: text/html; charset=utf-8\r\n' + \
                      'Date:' + time.strftime('%Y-%m-%d %H:%M:%S', time.localtime()) + '\r\n' + \
                      'Server: Flyme awei Server\r\n'
    response = (response_first_line + response_header + '\r\n' + response_body).encode('utf-8')
    return response


def page_not_found():
    with open('static/404.html', 'rb') as f:
        response_body = f.read()  # 响应的主体页面内容
    # 响应头
    response_first_line = 'HTTP/1.1 404 Not Found\r\n'
    response_header = 'Content-Length:' + str(len(response_body)) + '\r\n' + \
                      'Content-Type: text/html; charset=utf-8\r\n' + \
                      'Date:' + time.strftime('%Y-%m-%d %H:%M:%S', time.localtime()) + '\r\n' + \
                      'Server: Flyme awei Server\r\n'

    response = (response_first_line + response_header + '\r\n').encode('utf-8') + response_body
    return response

2. If there is no corresponding response data to the request path, you also need to return the 404 page

How to use Python to develop a custom web framework

3. Use templates to display response content

1. Design a template index.html yourself, and use dynamic data to replace it in some places

<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>首页 - 电影列表</title>
    <link href="/css/bootstrap.min.css" rel="stylesheet">
    <script src="/js/jquery-1.12.4.min.js"></script>
    <script src="/js/bootstrap.min.js"></script>
</head>

<body>
<div class="navbar navbar-inverse navbar-static-top ">
        <div class="container">
        <div class="navbar-header">
                <button class="navbar-toggle" data-toggle="collapse" data-target="#mymenu">
                        <span class="icon-bar"></span>
                        <span class="icon-bar"></span>
                        <span class="icon-bar"></span>
                 </button>
                 <a href="#" class="navbar-brand">电影列表</a>
        </div>
        <div class="collapse navbar-collapse" id="mymenu">
                <ul class="nav navbar-nav">
                        <li class="active"><a href="">电影信息</a></li>
                        <li><a href="">个人中心</a></li>
                </ul>
        </div>
        </div>
</div>
<div class="container">

    <div class="container-fluid">

        <table class="table table-hover">
            <tr>
                    <th>序号</th>
                    <th>名称</th>
                    <th>导演</th>
                    <th>上映时间</th>
                    <th>票房</th>
                    <th>电影时长</th>
                    <th>类型</th>
                    <th>备注</th>
                    <th>删除电影</th>
            </tr>
            {%datas%}
        </table>
    </div>
</div>
</body>
</html>

2. How to replace it and what data to replace

response_body = response_body.replace(&#39;{%datas%}&#39;, data)

How to use Python to develop a custom web framework

4. Develop the routing list function of the framework

1. To develop new action resource functions in the future, you only need:

a , Add a conditional judgment branch

b, Add a special processing function

2. Routing: It is the direct mapping between the requested URL path and the processing function.

3. Routing table

Request path Processing function
/index. html index function
/user_info.html user_info function
# 定义路由表
route_list = {
    (&#39;/index.html&#39;, index),
    (&#39;/user_info.html&#39;, user_info)
}


for path, func in route_list:
    if request_path == path:
        return func()
    else:
        # 没有动态资源的数据,返回404页面
        return page_not_found()

Note : The user's dynamic resource request is completed by traversing the routing table to find the corresponding processing function.

5. Use a decorator to add routes

1. Use a decorator with parameters

# -*- coding: utf-8 -*-
# @File  : My_Web_Server.py
# @author: Flyme awei 
# @email : 1071505897@qq.com
# @Time  : 2022/7/24 21:28


# 定义路由表
route_list = []
# route_list = {
# (&#39;/index.html&#39;, index),
# (&#39;/user_info.html&#39;, user_info)
# }


# 定义一个带参数的装饰器
def route(request_path):  # 参数就是URL请求
    def add_route(func):
        # 添加路由表
        route_list.append((request_path, func))

        @wraps(func)
        def invoke(*args, **kwargs):
            # 调用指定的处理函数,并返回结果
            return func()
        return invoke
    return add_route


# 处理动态资源请求的函数
def handle_request(parm):
    request_path = parm[&#39;request_path&#39;]

    # if request_path == &#39;/index.html&#39;:  # 当前请求路径有与之对应的动态响应,当前框架只开发了 index.html的功能
    #     response = index()
    #     return response
    # elif request_path == &#39;/user_info.html&#39;:  # 个人中心的功能
    #     return user_info()
    # else:
    #     # 没有动态资源的数据,返回404页面
    #     return page_not_found()
    for path, func in route_list:
        if request_path == path:
            return func()
        else:
            # 没有动态资源的数据,返回404页面
            return page_not_found()

2. Add a route based on any processing function Function

@route(&#39;/user_info.html&#39;)

Summary: Using the decorator with parameters, we can automatically add our routes to the routing table.

6. Development case of movie list page

How to use Python to develop a custom web framework

1. Query data

my_web.py

# -*- coding: utf-8 -*-
# @File  : My_Web_Server.py
# @author: Flyme awei 
# @email : 1071505897@qq.com
# @Time  : 2022/7/24 21:28


import socket
import sys
import threading
import time
import MyFramework


# 开发自己的Web服务器主类
class MyHttpWebServer(object):

    def __init__(self, port):
        # 创建HTTP服务器的套接字
        server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        # 设置端口号复用,程序退出之后不需要等待几分钟,直接释放端口
        server_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, True)
        server_socket.bind((&#39;&#39;, port))
        server_socket.listen(128)
        self.server_socket = server_socket

    # 处理浏览器请求的函数
    @staticmethod
    def handle_browser_request(new_socket):
        # 接受客户端发送过来的数据
        recv_data = new_socket.recv(4096)
        # 如果没有收到数据,那么请求无效,关闭套接字,直接退出
        if len(recv_data) == 0:
            new_socket.close()
            return

        # 对接受的字节数据,转换成字符
        request_data = recv_data.decode(&#39;utf-8&#39;)
        print("浏览器请求的数据:", request_data)
        request_array = request_data.split(&#39; &#39;, maxsplit=2)
        # 得到请求路径
        request_path = request_array[1]
        print(&#39;请求路径是:&#39;, request_path)

        if request_path == &#39;/&#39;:  # 如果请求路径为跟目录,自动设置为/index.html
            request_path = &#39;/index.html&#39;

        # 根据请求路径来判断是否是动态资源还是静态资源
        if request_path.endswith(&#39;.html&#39;):
            &#39;&#39;&#39;动态资源的请求&#39;&#39;&#39;
            # 动态资源的处理交给Web框架来处理,需要把请求参数传给Web框架,可能会有多个参数,所有采用字典机构
            params = {
                &#39;request_path&#39;: request_path,
            }
            # Web框架处理动态资源请求之后,返回一个响应
            response = MyFramework.handle_request(params)
            new_socket.send(response)
            new_socket.close()


        else:
            &#39;&#39;&#39;静态资源的请求&#39;&#39;&#39;
            response_body = None  # 响应主体
            response_header = None  # 响应头
            response_first_line = None  # 响应头的第一行
            # 其实就是:根据请求路径读取/static目录中静态的文件数据,响应给客户端
            try:
                # 读取static目录中对应的文件数据,rb模式:是一种兼容模式,可以打开图片,也可以打开js
                with open(&#39;static&#39; + request_path, &#39;rb&#39;) as f:
                    response_body = f.read()
                if request_path.endswith(&#39;.jpg&#39;):
                    response_type = &#39;image/webp&#39;
                response_first_line = &#39;HTTP/1.1 200 OK&#39;
                response_header = &#39;Server: Laoxiao_Server\r\n&#39;

            except Exception as e:  # 浏览器想读取的文件可能不存在
                with open(&#39;static/404.html&#39;, &#39;rb&#39;) as f:
                    response_body = f.read()  # 响应的主体页面内容(字节)
                # 响应头 (字符数据)
                response_first_line = &#39;HTTP/1.1 404 Not Found\r\n&#39;
                response_header = &#39;Server: Laoxiao_Server\r\n&#39;
            finally:
                # 组成响应数据,发送给客户端(浏览器)
                response = (response_first_line + response_header + &#39;\r\n&#39;).encode(&#39;utf-8&#39;) + response_body
                new_socket.send(response)
                new_socket.close()  # 关闭套接字

    # 启动服务器,并且接受客户端的请求
    def start(self):
        # 循环并且多线程来接受客户端的请求
        while True:
            new_socket, ip_port = self.server_socket.accept()
            print("客户端的ip和端口", ip_port)
            # 一个客户端请求交给一个线程来处理
            sub_thread = threading.Thread(target=MyHttpWebServer.handle_browser_request, args=(new_socket,))
            sub_thread.setDaemon(True)  # 设置当前线程为守护线程
            sub_thread.start()  # 子线程要启动


# web服务器程序的入口
def main():
    web_server = MyHttpWebServer(8080)
    web_server.start()


if __name__ == &#39;__main__&#39;:
    main()

MyFramework .py

# -*- coding: utf-8 -*-
# @File  : My_Web_Server.py
# @author: Flyme awei 
# @email : 1071505897@qq.com
# @Time  : 2022/7/24 21:28


import time
from functools import wraps
import pymysql

# 定义路由表
route_list = []


# route_list = {
#     # (&#39;/index.html&#39;,index),
#     # (&#39;/userinfo.html&#39;,user_info)
# }

# 定义一个带参数装饰器
def route(request_path):  # 参数就是URL请求
    def add_route(func):
        # 添加路由到路由表
        route_list.append((request_path, func))

        @wraps(func)
        def invoke(*arg, **kwargs):
            # 调用我们指定的处理函数,并且返回结果
            return func()

        return invoke

    return add_route


# 处理动态资源请求的函数
def handle_request(params):
    request_path = params[&#39;request_path&#39;]

    for path, func in route_list:
        if request_path == path:
            return func()
    else:
        # 没有动态资源的数据,返回404页面
        return page_not_found()
    # if request_path ==&#39;/index.html&#39;: # 当前的请求路径有与之对应的动态响应,当前框架,我只开发了index.html的功能
    #     response = index()
    #     return response
    #
    # elif request_path ==&#39;/userinfo.html&#39;: # 个人中心的功能,user_info.html
    #     return user_info()
    # else:
    #     # 没有动态资源的数据,返回404页面
    #     return page_not_found()


# 当前user_info函数,专门处理userinfo.html的动态请求
@route(&#39;/userinfo.html&#39;)
def user_info():
    # 需求:在页面中动态显示当前系统时间
    date = time.strftime(&#39;%Y-%m-%d %H:%M:%S&#39;, time.localtime())
    # response_body =data

    with open(&#39;template/user_info.html&#39;, &#39;r&#39;, encoding=&#39;utf-8&#39;) as f:
        response_body = f.read()

    response_body = response_body.replace(&#39;{%datas%}&#39;, date)

    response_first_line = &#39;HTTP/1.1 200 OK\r\n&#39;
    response_header = &#39;Server: Laoxiao_Server\r\n&#39;

    response = (response_first_line + response_header + &#39;\r\n&#39; + response_body).encode(&#39;utf-8&#39;)
    return response


# 当前index函数,专门处理index.html的请求
@route(&#39;/index.html&#39;)
def index():
    # 需求:从数据库中取得所有的电影数据,并且动态展示
    # date = time.strftime(&#39;%Y-%m-%d %H:%M:%S&#39;, time.localtime())
    # response_body =data
    # 1、从MySQL中查询数据
    conn = pymysql.connect(host=&#39;localhost&#39;, port=3306, user=&#39;root&#39;, password=&#39;******&#39;, database=&#39;test&#39;, charset=&#39;utf8&#39;)
    cursor = conn.cursor()
    cursor.execute(&#39;select * from t_movies&#39;)
    result = cursor.fetchall()
    # print(result)

    datas = ""
    for row in result:
        datas += &#39;&#39;&#39;<tr>
                <td>%s</td>
                <td>%s</td>
                <td>%s</td>
                <td>%s</td>
                <td>%s 亿人民币</td>
                <td>%s</td>
                <td>%s</td>
                <td>%s</td>
                <td> <input type=&#39;button&#39;  value=&#39;删除&#39;/> </td>
                </tr>
                &#39;&#39;&#39; % row
    print(datas)

    # 把查询的数据,转换成动态内容
    with open(&#39;template/index.html&#39;, &#39;r&#39;, encoding=&#39;utf-8&#39;) as f:
        response_body = f.read()

    response_body = response_body.replace(&#39;{%datas%}&#39;, datas)

    response_first_line = &#39;HTTP/1.1 200 OK\r\n&#39;
    response_header = &#39;Server: Laoxiao_Server\r\n&#39;

    response = (response_first_line + response_header + &#39;\r\n&#39; + response_body).encode(&#39;utf-8&#39;)
    return response


# 处理没有找到对应的动态资源
def page_not_found():
    with open(&#39;static/404.html&#39;, &#39;rb&#39;) as f:
        response_body = f.read()  # 响应的主体页面内容(字节)
    # 响应头 (字符数据)
    response_first_line = &#39;HTTP/1.1 404 Not Found\r\n&#39;
    response_header = &#39;Server: Laoxiao_Server\r\n&#39;
    response = (response_first_line + response_header + &#39;\r\n&#39;).encode(&#39;utf-8&#39;) + response_body
    return response

2. Get dynamic content based on the queried data

How to use Python to develop a custom web framework

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