python網絡基礎之單程序單線程實作非堵塞的http伺服器

用單程序/單線程我們可以實作一個傳回網頁頁面的http伺服器，其中主要的是把堵塞變為非堵塞 套接字.setblocking(False)，來實作一個長連接配接

import socket
import re
import time


def main():
    # 建立套接字
    socket_tcp = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    socket_tcp.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
    # 綁定本地資訊
    socket_tcp.bind(("", 7899))
    # 監聽 listen
    socket_tcp.listen(128)
    # 把堵塞變為非堵塞
    socket_tcp.setblocking(False)
    # 建立空清單以存儲使用者
    client_list = list()

    while True:
        # time.sleep(0.5)
        try:

            # 拆包accept，等待客戶來連接配接
            new_socket, add_socket = socket_tcp.accept()
            # 為連接配接進來的客戶服務
        except Exception as ret:
            # print("沒有使用者連接配接")
            pass
        else:
            # print("有使用者連接配接")
            # 伺服器接收浏覽器請求
            new_socket.setblocking(False)
            # 将連接配接到的使用者添加到清單中
            client_list.append(new_socket)
        # 對清單進行周遊
        for client_sock in client_list:
            # 處理異常
            try:
                # 周遊到的使用者進行接受資訊
                requese = client_sock.recv(1024).decode("utf-8")
            except Exception as ret:
                # print("客戶沒有發送請求")
                pass
            else:
                # 如果已接受到資訊
                if requese:
                    # print("客戶已發送請求")
                    #對接受到的資訊進行拆分，以定制規則
                    requess = requese.splitlines()
                    # print(requese)
                    print(requess)

                    file_name = "     "
                    res = re.match(r"[^/]+(/[^ ]*)", requess[0])

                    if res:
                        file_name = res.group(1)
                        if file_name == "/":
                            file_name = "/index.html"

                    """伺服器響應浏覽器"""
                    try:
                        file = open("./html" + file_name, "rb")
                    except:
                        respont = "HTTP/1.1 404 NOT FOUND \r\n"
                        respont += "\r\n"
                        respont += "<h1 style = 'color:red'>NOT FOUND 此目錄</h1>"
                        client_sock.send(respont.encode("gbk"))
                    else:
                        file_content = file.read()
                        file.close()

                        # 響應頭HTTP/1.1 200 OK
                        respont = "HTTP/1.1 200 OK \r\n"

                        # 接受body的長度去實作長連接配接的http
                        respont += "Content-Length:%d\r\n" % len(file_content)
                        respont += "\r\n"

                        client_sock.send(respont.encode("utf-8"))

                        # 響應body
                        client_sock.send(file_content)
                else:

                    # 關閉套接字
                    client_sock.close()
                    client_list.remove(client_sock)

    # 關閉套接字
    socket_tcp.close()


if __name__ == '__main__':
    main()