2 # this is for django objects only
3 #from django.core import serializers
4 from django.http import HttpResponse, HttpResponseForbidden
6 #from manifold.manifoldquery import ManifoldQuery
7 from manifold.core.query import Query
8 from manifold.manifoldapi import ManifoldAPI
9 from manifold.manifoldresult import ManifoldException
14 # add artificial delay in s
18 # pretend the server only returns - empty lists to 'get' requests - this is to mimick
19 # misconfigurations or expired credentials or similar corner case situations
23 # turn this on if you want the fastest possible (locally cached) feedback
24 # beware that this is very rough though...
28 # this view is what the javascript talks to when it sends a query
32 # static/js/manifold.js
33 def proxy (request,format):
34 """the view associated with /manifold/proxy/
35 with the query passed using POST"""
38 if request.method != 'POST':
39 print "manifoldproxy.api: unexpected method %s -- exiting"%request.method
41 # we only support json for now
42 # if needed in the future we should probably cater for
43 # format_in : how is the query encoded in POST
44 # format_out: how to serve the results
46 print "manifoldproxy.proxy: unexpected format %s -- exiting"%format
49 # translate incoming POST request into a query object
50 if debug: print 'manifoldproxy.proxy: request.POST',request.POST
51 manifold_query = Query()
52 #manifold_query = ManifoldQuery()
53 manifold_query.fill_from_POST(request.POST)
54 offline_filename="offline-%s-%s.json"%(manifold_query.action,manifold_query.object)
55 # retrieve session for request
56 manifold_api_session_auth = request.session['manifold']['auth']
57 if debug_empty and manifold_query.action.lower()=='get':
58 json_answer=json.dumps({'code':0,'value':[]})
59 print "By-passing : debug_empty & 'get' request : returning a fake empty list"
60 return HttpResponse (json_answer, mimetype="application/json")
61 ### patch : return the latest one..
63 # if that won't work then we'll try to update anyways
65 with (file(offline_filename,"r")) as f:
67 print "By-passing : using contents from %s"%offline_filename
68 return HttpResponse (json_answer, mimetype="application/json")
72 print "Could not run in offline mode, PROCEEDING"
76 manifold_api= ManifoldAPI(auth=manifold_api_session_auth)
77 if debug: print '===> manifoldproxy.proxy: sending to backend', manifold_query
78 # for the benefit of the python code, manifoldAPI raises an exception if something is wrong
79 # however in this case we want to propagate the complete manifold result to the js world
81 answer=manifold_api.send_manifold_query (manifold_query)
82 except ManifoldException, manifold_result:
83 answer=manifold_result
85 print "ANSWER IN PROXY", answer
86 print answer.ok_value()
89 print '<=== manifoldproxy.proxy: received from backend with code', answer['code']
92 value=answer.ok_value()
93 if isinstance (value, list): print "result is a list with %d entries"%len(value)
94 elif isinstance (value, dict): print "result is a dict with keys %s"%value.keys()
95 else: print "result is other (type=%s) : %s"%(type(value),value)
96 json_answer=json.dumps(answer)
97 # if in debug mode we save this so we can use offline mode later
99 with (file(offline_filename,"w")) as f:
101 # this is an artificial delay added for debugging purposes only
103 print "Adding additional artificial delay",debug_spin
105 time.sleep(debug_spin)
106 return HttpResponse (json_answer, mimetype="application/json")
110 traceback.print_exc()
113 # see CSRF_FAILURE_VIEW in settings.py
114 # the purpose of redefining this was to display the failure reason somehow
115 # this however turns out disappointing/not very informative
116 failure_answer=[ "csrf_failure" ]
117 def csrf_failure(request, reason=""):
118 print "CSRF failure with reason '%s'"%reason
119 return HttpResponseForbidden (json.dumps (failure_answer), mimetype="application/json")