Mini web framework: adding routes in decorator mode | dark horse programmer

Learning goals

• You can know how to add routes in decorator mode

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1. Add a route using a decorator with parameters

We have already implemented the routing list , But every time you add a route, you need to add it manually , Next, we want to complete the automatic addition of routes , It can be realized by decorator , When decorating a processing function with a decorator, we need to know that the decorated function is associated with the request path , That is to say, the decorator needs to receive one url Parameters , So the decorator we define is a decorator with parameters .

Sample code :

"""miniweb frame , Responsible for processing dynamic resource requests """
import time

#  Define routing list 
route_list = []


#  Decorator with parameters 
def route(path):
    #  Decorator 
    def decorator(func):
        #  When executing the decorator to decorate the specified function , Add paths and functions to the routing list 
        route_list.append((path, func))

        def inner():
            #  Execute the specified function 
            return func()

        return inner
    #  Return to the decorator 
    return decorator


#  Get home page data 
@route("/index.html")
def index():
    #  Response state 
    status = "200 OK";
    #  Response head 
    response_header = [("Server", "PWS2.0")]

    #  Open template file , Reading data 
    with open("template/index.html", "r") as file:
        file_data = file.read()

    #  Processed data ,  Query from database 
    data = time.ctime()
    #  Replace the template in the template file 
    result = file_data.replace("{%content%}", data)

    return status, response_header, result


#  Get personal center data 
@route("/center.html")
def center():
    #  Response state 
    status = "200 OK";
    #  Response head 
    response_header = [("Server", "PWS2.0")]

    #  Open template file , Reading data 
    with open("template/center.html", "r") as file:
        file_data = file.read()

    #  Processed data ,  Query from database 
    data = time.ctime()
    #  Replace the template in the template file 
    result = file_data.replace("{%content%}", data)

    return status, response_header, result


#  Dynamic resource not found 
def not_found():
    #  Response state 
    status = "404 Not Found";
    #  Response head 
    response_header = [("Server", "PWS2.0")]
    #  Processed data 
    data = "not found"

    return status, response_header, data


#  Handle dynamic resource requests 
def handle_request(env):
    #  Get the dynamic request resource path 
    request_path = env["request_path"]
    print(" Dynamic resource request received :", request_path)
    #  Traverse the routing list , Select the function to execute 
    for path, func in route_list:
        if request_path == path:
            result = func()
            return result
    else:
        #  Dynamic resource not found 
        result = not_found()
        return result

2. Summary

• Decorate the handler with a decorator with parameters , And complete the function of adding routes .

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