Add the ability for input types to have their own state

and add in a handler for ungraded responses via xqueue

common/lib/capa/capa/capa_problem.py

@@ -111,6 +111,7 @@ class LoncapaProblem(object):
         if self.system is None:
             raise Exception()
         self.seed = seed
+        self.input_state = None
 
         if state:
             if 'seed' in state:
@@ -121,11 +122,16 @@ class LoncapaProblem(object):
                 self.correct_map.set_dict(state['correct_map'])
             if 'done' in state:
                 self.done = state['done']
+            if 'input_state' in state:
+                self.input_state = state['input_state']
 
         # TODO: Does this deplete the Linux entropy pool? Is this fast enough?
         if not self.seed:
             self.seed = struct.unpack('i', os.urandom(4))[0]
 
+        if not self.input_state:
+            self.input_state = {}
+
         # Convert startouttext and endouttext to proper <text></text>
         problem_text = re.sub("startouttext\s*/", "text", problem_text)
         problem_text = re.sub("endouttext\s*/", "/text", problem_text)
@@ -188,6 +194,7 @@ class LoncapaProblem(object):
         return {'seed': self.seed,
                 'student_answers': self.student_answers,
                 'correct_map': self.correct_map.get_dict(),
+                'input_state': self.input_state,
                 'done': self.done}
 
     def get_max_score(self):
@@ -237,6 +244,19 @@ class LoncapaProblem(object):
         self.correct_map.set_dict(cmap.get_dict())
         return cmap
 
+    def ungraded_response(self, xqueue_msg, queuekey):
+        '''
+        Handle any responses from the xqueue that are not related to grading
+
+        Does not return any value
+        '''
+        # check against each inputtype
+        for the_input in self.inputs.values():
+            # if the input type has an xqueue_response function, pass in the values
+            if hasattr(the_input, 'ungraded_response'):
+                the_input.ungraded_response(xqueue_msg, queuekey)
+
+
     def is_queued(self):
         '''
         Returns True if any part of the problem has been submitted to an external queue
@@ -527,11 +547,15 @@ class LoncapaProblem(object):
             value = ""
             if self.student_answers and problemid in self.student_answers:
                 value = self.student_answers[problemid]
+            
+            if input_id not in self.input_state:
+                self.input_state[input_id] = {}
 
             # do the rendering
             state = {'value': value,
                    'status': status,
                    'id': input_id,
+                   'input_state': self.input_state[input_id],
                    'feedback': {'message': msg,
                                 'hint': hint,
                                 'hintmode': hintmode, }}

common/lib/capa/capa/inputtypes.py

@@ -134,6 +134,8 @@ class InputTypeBase(object):
                       * 'id' -- the id of this input, typically
                                 "{problem-location}_{response-num}_{input-num}"
                       * 'status' (answered, unanswered, unsubmitted)
+                      * 'input_state' -- dictionary containing any inputtype-specific state
+                                        that has been preserved
                       * 'feedback' (dictionary containing keys for hints, errors, or other
                          feedback from previous attempt.  Specifically 'message', 'hint',
                          'hintmode'.  If 'hintmode' is 'always', the hint is always displayed.)
@@ -160,6 +162,7 @@ class InputTypeBase(object):
         self.msg = feedback.get('message', '')
         self.hint = feedback.get('hint', '')
         self.hintmode = feedback.get('hintmode', None)
+        self.input_state = state.get('input_state', {})
 
         # put hint above msg if it should be displayed
         if self.hintmode == 'always':
@@ -643,8 +646,11 @@ class MatlabInput(CodeInput):
         self.queue_len = 0
         self.queuename = 'matlab'
         # Flag indicating that the problem has been queued, 'msg' is length of
+        self.queue_msg = None
         # queue
         if self.status == 'incomplete':
+            if 'queue_msg' in self.input_state:
+                self.queue_msg = self.input_state['queue_msg']
             self.status = 'queued'
             self.queue_len = self.msg
             self.msg = self.submitted_msg
@@ -652,13 +658,47 @@ class MatlabInput(CodeInput):
 
 
     def handle_ajax(self, dispatch, get):
+        ''' Handle AJAX calls directed to this input'''
         if dispatch == 'plot':
-            return self.plot_data(get)
-        elif dispatch == 'xqueue_response':
-            # render the response
-            pass
+            return self._plot_data(get)
 
-    def plot_data(self, get):
+    def ungraded_response(self, queue_msg, queuekey):
+        ''' Handle any XQueue responses that have to be saved and rendered '''
+        # check the queuekey against the saved queuekey
+        if('queuestate' in self.input_state and self.input_state['queuestate'] == 'queued' 
+                and self.input_state['queuekey'] == queuekey):
+            msg = _parse_message(queue_msg)
+            # save the queue message so that it can be rendered later
+            self.input_state['queue_msg'] = msg
+            self.input_state['queued'] = 'dequeued'
+
+    def _extra_context(self):
+        ''' Set up additional context variables'''
+        extra_context = {'queue_len': self.queue_len}
+        if self.queue_msg is not None:
+            extra_context['queue_msg'] = self.queue_msg
+        else:
+            extra_context['queue_msg'] = ''
+        return extra_context
+
+    def _parse_data(self, queue_msg):
+        '''
+        takes a queue_msg returned from the queue and parses it and returns
+        whatever is stored in msg
+        returns string msg
+        '''
+        try:
+            result = json.loads(queue_msg)
+        except (TypeError, ValueError):
+            log.error("External message should be a JSON serialized dict."
+                    " Received queue_msg = %s" % queue_msg)
+            raise
+        # TODO: needs more error checking
+        msg = result['msg']
+        return msg
+
+
+    def _plot_data(self, get):
         ''' send data via xqueue to the mathworks backend'''
         # only send data if xqueue exists
         if self.system.xqueue is not None:
@@ -668,7 +708,7 @@ class MatlabInput(CodeInput):
             # construct xqueue headers
             qinterface = self.system.xqueue['interface']
             qtime = datetime.strftime(datetime.now(), xqueue_interface.dateformat)
-            callback_url = self.system.xqueue['construct_callback']('input_ajax')
+            callback_url = self.system.xqueue['construct_callback']('ungraded_response')
             anonymous_student_id = self.system.anonymous_student_id
             queuekey = xqueue_interface.make_hashkey(str(self.system.seed) + qtime +
                                                      anonymous_student_id +
@@ -678,6 +718,10 @@ class MatlabInput(CodeInput):
                     lms_key = queuekey,
                     queue_name = self.queuename)
 
+            # save the input state
+            self.input_state['queuekey'] = queuekey
+            self.input_state['queuestate'] = 'queued'
+
 
             # construct xqueue body
             student_info = {'anonymous_student_id': anonymous_student_id,

common/lib/capa/capa/templates/matlabinput.html

@@ -29,6 +29,9 @@
   <div class="external-grader-message">
     ${msg|n}
   </div>
+  <div class="external-grader-message">
+    ${queue_msg|n}
+  </div>
 
   <div class="plot-button">
           <input type="button" name="plot-button" value="Plot" />

common/lib/capa/capa/tests/test_inputtypes.py

@@ -344,6 +344,35 @@ class MatlabTest(unittest.TestCase):
                    'mode': self.mode,
                    'rows': self.rows,
                    'cols': self.cols,
+                   'queue_msg': '',
+                   'linenumbers': 'true',
+                   'hidden': '',
+                   'tabsize': int(self.tabsize),
+                   'queue_len': '3',
+                   }
+
+        self.assertEqual(context, expected)
+
+
+    def test_rendering_with_state(self):
+        state = {'value': 'print "good evening"',
+                 'status': 'incomplete',
+                 'input_state': {'queue_msg': 'message'},
+                 'feedback': {'message': '3'}, }
+        elt = etree.fromstring(self.xml)
+
+        input_class = lookup_tag('matlabinput')
+        the_input = self.input_class(test_system, elt, state)
+        context = the_input._get_render_context()
+
+        expected = {'id': 'prob_1_2',
+                    'value': 'print "good evening"',
+                   'status': 'queued',
+                   'msg': self.input_class.submitted_msg,
+                   'mode': self.mode,
+                   'rows': self.rows,
+                   'cols': self.cols,
+                   'queue_msg': 'message',
                    'linenumbers': 'true',
                    'hidden': '',
                    'tabsize': int(self.tabsize),
@@ -358,8 +387,9 @@ class MatlabTest(unittest.TestCase):
 
         test_system.xqueue['interface'].send_to_queue.assert_called_with(header=ANY, body=ANY)
         
-
         self.assertTrue(response['success'])
+        self.assertTrue(self.the_input.input_state['queuekey'] is not None)
+        self.assertEqual(self.the_input.input_state['queuestate'], 'queued')
 
 
 

common/lib/xmodule/xmodule/capa_module.py

@@ -93,6 +93,7 @@ class CapaFields(object):
     rerandomize = Randomization(help="When to rerandomize the problem", default="always", scope=Scope.settings)
     data = String(help="XML data for the problem", scope=Scope.content)
     correct_map = Object(help="Dictionary with the correctness of current student answers", scope=Scope.student_state, default={})
+    input_state = Object(help="Dictionary for maintaining the state of inputtypes", scope=Scope.student_state, default={})
     student_answers = Object(help="Dictionary with the current student responses", scope=Scope.student_state)
     done = Boolean(help="Whether the student has answered the problem", scope=Scope.student_state)
     display_name = String(help="Display name for this module", scope=Scope.settings)
@@ -188,6 +189,7 @@ class CapaModule(CapaFields, XModule):
             'done': self.done,
             'correct_map': self.correct_map,
             'student_answers': self.student_answers,
+            'input_state': self.input_state,
             'seed': self.seed,
         }
 
@@ -195,6 +197,7 @@ class CapaModule(CapaFields, XModule):
         lcp_state = self.lcp.get_state()
         self.done = lcp_state['done']
         self.correct_map = lcp_state['correct_map']
+        self.input_state = lcp_state['input_state']
         self.student_answers = lcp_state['student_answers']
         self.seed = lcp_state['seed']
 
@@ -443,7 +446,8 @@ class CapaModule(CapaFields, XModule):
             'problem_save': self.save_problem,
             'problem_show': self.get_answer,
             'score_update': self.update_score,
-            'input_ajax': self.lcp.handle_input_ajax
+            'input_ajax': self.lcp.handle_input_ajax,
+            'ungraded_response': self.handle_ungraded_response
             }
 
         if dispatch not in handlers:
@@ -537,6 +541,17 @@ class CapaModule(CapaFields, XModule):
 
         return dict()  # No AJAX return is needed
 
+    def handle_ungraded_response(self, get):
+        '''
+        Get the XQueue response
+        '''
+        queuekey = get['queuekey']
+        score_msg = get['xqueue_body']
+        # pass along the xqueue message to the problem
+        self.lcp.ungraded_response(score_msg, queuekey)
+
+        self.set_state_from_lcp()
+
     def get_answer(self, get):
         '''
         For the "show answer" button.