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@ -2,7 +2,7 @@ |
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# kate: space-indent on; indent-width 4; replace-tabs on; |
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""" |
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* Copyright (C) 2010, Michael "Svedrin" Ziegler <diese-addy@funzt-halt.net> |
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* Copyright (C) 200, Michael "Svedrin" Ziegler <diese-addy@funzt-halt.net> |
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* |
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* Mumble-Django is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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@ -18,8 +18,16 @@ |
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import simplejson |
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import inspect |
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import functools |
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import traceback |
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from sys import stderr |
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from django.http import HttpResponse |
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from django.conf import settings |
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from django.conf.urls.defaults import patterns |
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from django.core.urlresolvers import reverse |
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from django.utils.datastructures import MultiValueDictKeyError |
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from django.views.decorators.csrf import csrf_exempt |
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def getname( cls_or_name ): |
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if type(cls_or_name) not in ( str, unicode ): |
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@ -27,66 +35,165 @@ def getname( cls_or_name ): |
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return cls_or_name |
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class Provider( object ): |
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def __init__( self, base_url ): |
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self.base_url = base_url |
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self.classes = {} |
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def register_instance( self, cls_or_name, instance ): |
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name = getname(cls_or_name) |
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if name not in self.classes: |
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raise KeyError(name) |
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self.classes[ name ][0] = instance |
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return instance |
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""" Provider for Ext.Direct. This class handles building API information and |
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routing requests to the appropriate functions, and serializing their |
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response and exceptions - if any. |
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Instantiation: |
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>>> EXT_JS_PROVIDER = Provider( [name="Ext.app.REMOTING_API"] ) |
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After instantiating the Provider, register functions to it like so: |
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>>> @EXT_JS_PROVIDER.register_method("myclass") |
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def myview( request, possibly, some, other, arguments ): |
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" does something with all those args and returns something " |
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return 13.37 |
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Note that those views **MUST NOT** return an HttpResponse but simply |
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the plain result, as the Provider will build a response from whatever |
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your view returns! |
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To be able to access the Provider, include its URLs in an arbitrary |
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URL pattern, like so: |
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>>> from views import EXT_JS_PROVIDER # import our provider instance |
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>>> urlpatterns = patterns( |
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# other patterns go here |
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( r'api/', include(EXT_DIRECT_PROVIDER.urls) ), |
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) |
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This way, the Provider will define the URLs "api/api.js" and "api/router". |
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If you then access the "api/api.js" URL, you will get a response such as: |
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Ext.app.REMOTING_API = { # Ext.app.REMOTING_API is from Provider.name |
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"url": "/mumble/api/router", |
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"type": "remoting", |
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"actions": {"myclass": [{"name": "myview", "len": 4}]} |
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} |
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You can then use this code in ExtJS to define the Provider there. |
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""" |
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def __init__( self, name="Ext.app.REMOTING_API" ): |
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self.name = name |
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self.classes = {} |
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def register_method( self, cls_or_name ): |
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""" Return a function that takes a method as an argument and adds that to cls_or_name. """ |
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print "REGMETHOD", cls_or_name |
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clsname = getname(cls_or_name) |
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if clsname not in self.classes: |
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self.classes[clsname] = ( None, {} ) |
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self.classes[clsname] = {} |
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return functools.partial( self._register_method, cls_or_name ) |
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def _register_method( self, cls_or_name, method ): |
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print "REGREALMETHOD", cls_or_name, method |
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self.classes[ getname(cls_or_name) ][1][ method.__name__ ] = method |
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""" Actually registers the given function as a method of cls_or_name. """ |
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self.classes[ getname(cls_or_name) ][ method.__name__ ] = method |
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return method |
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def get_api( self, name="Ext.app.REMOTING_API" ): |
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@csrf_exempt |
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def get_api( self, request ): |
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""" Introspect the methods and get a JSON description of this API. """ |
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actdict = {} |
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for clsname in self.classes: |
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actdict[clsname] = [] |
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for methodname in self.classes[clsname][1]: |
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for methodname in self.classes[clsname]: |
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actdict[clsname].append( { |
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"name": methodname, |
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"len": len( inspect.getargspec( self.classes[clsname][1][methodname] ).args ) |
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"len": len( inspect.getargspec( self.classes[clsname][methodname] ).args ) - 1 |
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} ) |
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return "%s = %s" % ( name, simplejson.dumps({ |
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"url": ("%s/router" % self.base_url), |
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return HttpResponse( "%s = %s;" % ( self.name, simplejson.dumps({ |
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"url": reverse( self.request ), |
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"type": "remoting", |
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"actions": actdict |
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})) |
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})), mimetype="text/javascript" ) |
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@csrf_exempt |
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def request( self, request ): |
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cls = request.POST['extAction'] |
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methname = request.POST['extMethod'] |
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data = request.POST['extData'] |
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rtype = request.POST['extType'] |
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tid = request.POST['extTID'] |
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if cls not in self.classes: |
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raise KeyError(cls) |
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if methname not in self.classes[cls][1]: |
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raise KeyError(methname) |
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result = self.classes[cls][1][methname]( *data, request=request ) |
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return HttpResponse( simplejson.dumps({ |
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"type": rtype, |
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"tid": tid, |
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"action": cls, |
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"method": methname, |
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"result": result |
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})) |
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""" Implements the Router part of the Ext.Direct specification. |
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It handles decoding requests, calling the appropriate function (if |
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found) and encoding the response / exceptions. |
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""" |
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try: |
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rawjson = [{ |
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'action': request.POST['extAction'], |
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'method': request.POST['extMethod'], |
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'data': request.POST['extData'], |
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'type': request.POST['extType'], |
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'tid': request.POST['extTID'], |
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}] |
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except (MultiValueDictKeyError, KeyError): |
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rawjson = simplejson.loads( request.raw_post_data ) |
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if not isinstance( rawjson, list ): |
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rawjson = [rawjson] |
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responses = [] |
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for reqinfo in rawjson: |
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cls, methname, data, rtype, tid = (reqinfo['action'], |
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reqinfo['method'], |
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reqinfo['data'], |
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reqinfo['type'], |
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reqinfo['tid']) |
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if cls not in self.classes: |
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responses.append({ |
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'type': 'exception', |
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'message': 'no such action', |
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'where': cls, |
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"tid": tid, |
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}) |
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continue |
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if methname not in self.classes[cls]: |
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responses.append({ |
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'type': 'exception', |
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'message': 'no such method', |
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'where': methname, |
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"tid": tid, |
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}) |
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continue |
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try: |
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if data: |
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result = self.classes[cls][methname]( request, *data ) |
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else: |
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result = self.classes[cls][methname]( request ) |
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except Exception, err: |
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errinfo = { |
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'type': 'exception', |
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"tid": tid, |
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} |
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if settings.DEBUG: |
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traceback.print_exc( file=stderr ) |
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errinfo['message'] = unicode(err) |
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errinfo['where'] = '\n'.join(traceback.format_exception()) |
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else: |
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errinfo['message'] = 'Sorry, an error occurred.' |
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errinfo['where'] = '' |
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responses.append(errinfo) |
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else: |
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responses.append({ |
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"type": rtype, |
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"tid": tid, |
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"action": cls, |
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"method": methname, |
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"result": result |
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}) |
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if len(responses) == 1: |
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return HttpResponse( simplejson.dumps( responses[0] ), mimetype="text/javascript" ) |
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else: |
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return HttpResponse( simplejson.dumps( responses ), mimetype="text/javascript" ) |
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@property |
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def urls(self): |
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""" Return the URL patterns. """ |
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return patterns('', |
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(r'api.js$', self.get_api ), |
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(r'router/?', self.request ), |
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) |
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Michael Ziegler
15 years ago