摘要：目前來說文章亮點就是解耦做的還行，有一定的可擴展性簡單的仿實現路由分發規定應用程序需要是一個可調用的對象可調用對象接收兩個參數可調用對象要返回一個值，這個值是可迭代的。

最近web服務器知識，中間懶癌犯了，斷了一兩天后思路有點接不上來，手頭上也有其他事情要做，先簡單的總結下學習進度，很多重要的功能都沒跑通，目前flask只是簡單實現路由分顯示不同的結果，cgi可以根據不同的靜態資源或者py腳本文件路徑顯示不同的結果。目前來說文章亮點就是解耦做的還行，有一定的可擴展性

from wsgiref.simple_server import make_server


""""
WSGI規定：
1. 應用程序需要是一個可調用的對象
2. 可調用對象接收兩個參數
3.可調用對象要返回一個值，這個值是可迭代的。
具體參考附錄一，pep-0333標準
"""
class SimServer(object):
    def __init__(self):
        self.url_map = {}
    
    def __call__(self, environ, start_response):
        status = u"200 OK"
        response_headers = [("Content-type", "text/plain")]
        start_response(status, response_headers)
        data=self.dispatch_request(environ)
        return [data.encode("utf-8"),]
    
    def run(self, ip=None, host=None):
        if not ip:
            ip = ""
        if not host:
            host = 8080
        httpd = make_server(ip, host, self)
        httpd.serve_forever()
    
    #路由裝飾器
    def route(self, rule):  
        def decorator(f):  
            self.url_map[rule.lstrip("/")] = f
            return f
        
        return decorator
    
    #路由的分發
    def dispatch_request(self, request):
        print(request)
        path = request.get("PATH_INFO", "").lstrip("/")
        print(path)
        return self.url_map[path]()  # 從url_map中找到對應的處理函數，并調用



#創建一個app
app=SimServer()

@app.route("/index")
def index():
    return  "hello world"


@app.route("/login")
def login():
    return "please login"

if __name__=="__main__":
    app.run()


if __name__=="__main__":
    app.run()

handler.py

import os
import subprocess

class BaseHandler(object):
    """Parent for case handlers."""
    
    def handle_file(self, handler, full_path):
        try :
            with open(full_path, "rb") as reader:
                content = reader.read()
            handler.send_content(content)
        except IOError as msg:
            msg = ""{0}" cannot be read: {1}".format(full_path, msg)
            handler.handle_error(msg)
    
    def index_path(self, handler):
        return os.path.join(handler.full_path, "index.html")
    
    def test(self, handler):
        assert False, "Not implemented."
    
    def act(self, handler):
        assert False, "Not implemented."

#處理首頁
class Case_directory_idnex_file(BaseHandler):
    def test(self, handler):
        return (os.path.isdir(handler.full_path) and
                os.path.isfile(self.index_path(handler)))
    
    def act(self, handler):
        self.handle_file(handler, self.index_path(handler))
    

#處理普通html文件
class Case_existing_file(BaseHandler):
    def test(self, handler):
        return os.path.isfile((handler.full_path))
    
    def act(self, handler):
        self.handle_file(handler,handler.full_path)

#處理python腳本        
class Case_cgi_file(BaseHandler):
    def run_cgi(self, handler):
        print("dfs")
        print(handler.full_path)
        data=subprocess.getoutput(["python",handler.full_path])
        print("data={}".format(data))
        #python3默認使用unicode，需要encode("utf-8")
        return handler.send_content(data.encode("utf-8"))
        
    def test(self,handler):
        return os.path.isfile(handler.full_path) and 
               handler.full_path.endswith(".py")
    def act(self,handler):
        self.run_cgi(handler)
        

requestHandler.py

from http.server import BaseHTTPRequestHandler,HTTPServer
import os
from simpleServer.handler import *


class RequestHandler(BaseHTTPRequestHandler):
    Cases = [Case_cgi_file(),Case_directory_idnex_file(),Case_existing_file() ,]
    
    # How to display an error.
    Error_Page = """
        
        
        
Error accessing {path}
        
{msg}
        
        
        """
    
    # Classify and handle request.
    def do_GET(self):
        try:
            # 使用join會有問題，目前還沒搞清楚+可以，join會有問題
            self.full_path = os.getcwd()+self.path
            # Figure out how to handle it.
            print("cases{}".format(self.Cases))
            for case in self.Cases:
                if case.test(self):
                    case.act(self)
                    break
        
        # 處理異常
        except Exception as msg:
            print(msg)
            self.handle_error(msg)
    
    # Handle unknown objects.
    def handle_error(self, msg):
        content = self.Error_Page.format(path=self.path, msg=msg)
        self.send_content(content.encode("utf-8"), 404)
    
    # Send actual content.
    def send_content(self, content, status=200):
        self.send_response(status)
        self.send_header("Content-type", "text/html")
        self.send_header("Content-Length", str(len(content)))
        self.end_headers()
        self.wfile.write(content)

if __name__=="__main__":
    severAddress=("",8000)
    server=HTTPServer(severAddress,RequestHandler)
    server.serve_forever()

1, pyton：pep-0333
2, flask作者博客文章：getting-started-with-wsgi
3, 自己寫一個 wsgi 服務器運行 Django 、Tornado 等框架應用
4, 500L:a-simple-web-server
5, python wsgi簡介
6, 從零開始搭建論壇（二）：Web服務器網關接口
7, python的 WSGI 簡介
8，本文github源碼