摘要：目前来说文章亮点就是解耦做的还行，有一定的可扩展性简单的仿实现路由分发规定应用程序需要是一个可调用的对象可调用对象接收两个参数可调用对象要返回一个值，这个值是可迭代的。

最近web服务器知识，中间懒癌犯了，断了一两天后思路有点接不上来，手头上也有其他事情要做，先简单的总结下学习进度，很多重要的功能都没跑通，目前flask只是简单实现路由分显示不同的结果，cgi可以根据不同的静态资源或者py脚本文件路径显示不同的结果。目前来说文章亮点就是解耦做的还行，有一定的可扩展性

from wsgiref.simple_server import make_server


""""
WSGI规定：
1. 应用程序需要是一个可调用的对象
2. 可调用对象接收两个参数
3.可调用对象要返回一个值，这个值是可迭代的。
具体参考附录一，pep-0333标准
"""
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()
    
    #路由装饰器
    def route(self, rule):  
        def decorator(f):  
            self.url_map[rule.lstrip("/")] = f
            return f
        
        return decorator
    
    #路由的分发
    def dispatch_request(self, request):
        print(request)
        path = request.get("PATH_INFO", "").lstrip("/")
        print(path)
        return self.url_map[path]()  # 从url_map中找到对应的处理函数，并调用



#创建一个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."

#处理首页
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))
    

#处理普通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)

#处理python脚本        
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默认使用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会有问题，目前还没搞清楚+可以，join会有问题
            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
        
        # 处理异常
        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, 自己写一个 wsgi 服务器运行 Django 、Tornado 等框架应用
4, 500L:a-simple-web-server
5, python wsgi简介
6, 从零开始搭建论坛（二）：Web服务器网关接口
7, python的 WSGI 简介
8，本文github源码