werkzeug实现简单Python web框架（3）：添加动态路由

完整代码：
https://github.com/yangzhezjgs/Light/tree/master/webapp

借助werkzeug原生的Map,Rule来添加动态路由支持
修改了 __init__函数和add_url_rule，dispatch_request函数

import osfrom werkzeug.wrappers import BaseRequest, BaseResponsefrom werkzeug.exceptions import HTTPException, MethodNotAllowed, \     NotImplemented, NotFoundfrom werkzeug.routing import Map, Rulefrom werkzeug.serving import run_simplefrom jinja2 import Environment, FileSystemLoaderdef render_template(template_name, **context):    template_path = os.path.join(os.getcwd(), 'templates')    jinja_env = Environment(loader=FileSystemLoader(template_path),autoescape=True)    text = jinja_env.get_template(template_name).render(context)    return textclass Request(BaseRequest):    """Encapsulates a request."""class Response(BaseResponse):    """Encapsulates a response."""class View(object):    """Baseclass for our views."""    def __init__(self):        self.methods_meta = {            'GET': self.GET,            'POST': self.POST,            'PUT': self.PUT,            'DELETE': self.DELETE,        }    def GET(self):        raise MethodNotAllowed()    POST = DELETE = PUT = GET    def HEAD(self):        return self.GET()    def dispatch_request(self, request, *args, **options):        if request.method in self.methods_meta:            return self.methods_meta[request.method](request, *args, **options)        else:            return '<h1>Unknown or unsupported require method</h1>'    @classmethod    def get_func(cls):        def func(*args, **kwargs):            obj = func.view_class()            return obj.dispatch_request(*args, **kwargs)        func.view_class = cls        return funcclass WebApp(object):    """    An interface to a web.py like application.  It works like the web.run    function in web.py    """    def __init__(self):        self.url_map = Map()        self.view_function = {}    def wsgi_app(self,environ,start_response):        req = Request(environ)        response = self.dispatch_request(req)        if response:            response = Response(response,content_type='text/html; charset=UTF-8')        else:            response = Response('<h1>404 Source Not Found<h1>', content_type='text/html; charset=UTF-8', status=404)        return response(environ, start_response)    def __call__(self,environ,start_response):        return self.wsgi_app(environ,start_response)    def dispatch_request(self,req):        adapter = self.url_map.bind_to_environ(req.environ)        try:            endpoint, values = adapter.match()            return self.view_function[endpoint](req, **values)        except HTTPException as e:            return e    def add_url_rule(self,urls):         for url in urls:             rule = Rule(url['url'],endpoint=str(url['view']))             self.url_map.add(rule)             self.view_function[str(url['view'])]=url['view'].get_func()    def run(self, port=5000, ip='', debug=False):        run_simple(ip, port, self, use_debugger=debug, use_reloader=True)

测试用例：

from webapp import WebApp,View,render_templateclass Index(View):    def GET(self,request):        return render_template("index.html",name="world")class Test(View):    def GET(self,request,my_rule):        return "test ",my_ruleurls = [{    'url':'/',    'view':Index},{   'url':'/test/<my_rule>',   'view':Test}] if __name__ == '__main__':    app = WebApp()    app.add_url_rule(urls)    app.run()