jinja2にJSP以上の機能を持たせるRequestHandler、template_nameに基づくHTMLキャッシュ機能

ExHandler

class BaseRequestHandler(webapp2.RequestHandler):
    def dispatch(self):
        # Get a session store for this request.
        self.session_store = sessions.get_store(request=self.request)
        try:
            # Dispatch the request.
            webapp2.RequestHandler.dispatch(self)
        except Exception as e:
            logging.info(e)
            self.redirect(self.uri_for("main"))
        finally:
            # Save all sessions.
            self.session_store.save_sessions(self.response)
    @webapp2.cached_property    
    def jinja2(self):
        """
            @return: jinja2 environment instance
            @rtype: jinja2.Environment 
        """
        return jinja2.get_jinja2(app=self.app)
    @webapp2.cached_property
    def session(self):
        """
            @return: session dictionary(auto-save)
            @rtype: webapp2_extras.sessions.Session
        """
        return self.session_store.get_session()
    def render(self, template_name, template_vars={}):
        # Preset values for the template
        values = {
          'uri_for': self.uri_for,
          'flashes': self.session.get_flashes(),
          'template_name': template_name,
          'handler':self,
          'request':self.request,
          'response':self.response,
          'session':self.session
        }
        
        # Add manually supplied template values
        values.update(template_vars)
        
        # read the template or 404.html
        try:
            self.response.write(self.jinja2.render_template(template_name, **values))
        except TemplateNotFound as e:
            logging.info(e + " %s not found" % template_name)
            self.abort(404)

    def render_str(self, template_name, template_vars={}):
        # Preset values for the template
        values = {
          'uri_for': self.uri_for,
          'flashes': self.session.get_flashes(),
          'template_name': template_name,
          'handler':self,
          'request':self.request,
          'response':self.response,
          'session':self.session
        }
        
        # Add manually supplied template values
        values.update(template_vars)
        
        # read the template or 404.html
        try:
            return self.jinja2.render_template(template_name, **values)#.encode("UTF-8"))
        except TemplateNotFound as e:
            logging.info(e + " %s not found" % template_name)
            return None

    def render_cached(self, template_name, template_vars={}):
        cached_template = memcache.get(template_name)  # @UndefinedVariable
        if cached_template is None:
            cached_template = self.render_str(template_name, template_vars)
            memcache.add(template_name, cached_template)  # @UndefinedVariable
        self.response.write(cached_template)

    def render_str_cached(self, template_name, template_vars={}):
        cached_template = memcache.get(template_name)  # @UndefinedVariable
        if cached_template is None:
            cached_template = self.render_str(template_name, template_vars)
            memcache.add(template_name, cached_template)  # @UndefinedVariable
        return cached_template