无法在cherryPy中一起添加多个应用程序 [英] Unable to add more than one applications together in cherryPy

问题描述

当我这样做并尝试访问"/api"时，cherryPy会抛出"TypeError:'ApiStringGenerator'对象不可调用"错误

When I do this and try to access "/api" than cherryPy throws "TypeError: 'ApiStringGenerator' object is not callable" error

'''
Created on Jan 11, 2016

@author: ankurjat
'''
import cherrypy
import random
import string
import os

conf = {'/': {'tools.sessions.on': True,
              'tools.staticdir.root': os.path.abspath(os.getcwd())},
        '/static': {'tools.staticdir.on': True,
                    'tools.staticdir.dir': './resources'},
        '/api': {'request.dispatch':  cherrypy.dispatch.MethodDispatcher(),
                 'tools.sessions.on': True,
                 'tools.response_headers.on': True,
                 'tools.response_headers.headers': [('Content-Type', 'text/plain')]}
            }


class ApiStringGenerator(object):
    exposed = True

    @cherrypy.tools.accept(media='text/plain')
    def GET(self, length=8):
        value = cherrypy.session['mystring']
        return value

    def POST(self, length=8):
        value = ''.join(random.sample(string.hexdigits, int(length)))
        cherrypy.session['mystring'] = value
        return value

    def PUT(self, value):
        cherrypy.session['mystring'] = value

    def DELETE(self):
        cherrypy.session.pop('mystring', None)


class StringGenerator(object):
    @cherrypy.expose
    def index(self):
        return file('templates/index.html')


if __name__ == '__main__':
    cherrypy.tree.mount(ApiStringGenerator(), '/api', conf)
    cherrypy.tree.mount(StringGenerator(), '/', conf)

    cherrypy.engine.start()
    cherrypy.engine.block()

但是当我更改下面的行

cherrypy.tree.mount(ApiStringGenerator(), '/api', conf)
cherrypy.tree.mount(StringGenerator(), '/', conf)

cherrypy.engine.start()
cherrypy.engine.block()

通过代码

webapp = StringGenerator()
webapp.api = ApiStringGenerator()
cherrypy.quickstart(webapp, '/', conf)

然后没有错误，一切正常.请帮忙.

Then no error and everything works fine. Please help.

推荐答案

问题是cherrypy中的配置是相对于安装点的.

The problem is that the configuration in cherrypy is relative to the mountpoint.

因此，当您在安装点/api 中的/api 中配置 MethodDispatcher 时.您正在激活/api/api 中的 MethodDispatcher ，并且在/api 中使用的调度程序是默认调度程序，因此尝试调用对象，因为该对象具有 exposed 属性，但不能调用.这是默认调度程序的行为.

So when you are configuring the MethodDispatcher in /api inside the mount point /api. You are activating the MethodDispatcher inside /api/api and the dispatcher that's gets used in /api it's the default one, hence trying to call the object because the object has the exposed attribute but it's not callable. Which is the behavior of the default dispatcher.

如果您想这样做:

cherrypy.tree.mount(ApiStringGenerator(), '/api', conf)

该配置必须相对于/api :

 {'/': {'request.dispatch':  cherrypy.dispatch.MethodDispatcher(),
        'tools.sessions.on': True,
        'tools.response_headers.on': True,
        'tools.response_headers.headers': [('Content-Type',  'text/plain')]}}

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