129 lines
4.9 KiB
Python
129 lines
4.9 KiB
Python
import logging
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from lxml import etree
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from django.http import Http404
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from django.conf import settings
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from mitxmako.shortcuts import render_to_string
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from fs.osfs import OSFS
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from models import StudentModule
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import track.views
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import courseware.modules
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log = logging.getLogger("mitx.courseware")
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class I4xSystem(object):
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def __init__(self, ajax_url, track_function, render_function, filestore=None):
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self.ajax_url = ajax_url
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self.track_function = track_function
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self.filestore = OSFS(settings.DATA_DIR)
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self.render_function = render_function
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self.exception404 = Http404
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def object_cache(cache, user, module_type, module_id):
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# We don't look up on user -- all queries include user
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# Additional lookup would require a DB hit the way Django
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# is broken.
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for o in cache:
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if o.module_type == module_type and \
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o.module_id == module_id:
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return o
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return None
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def make_track_function(request):
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''' We want the capa problem (and other modules) to be able to
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track/log what happens inside them without adding dependencies on
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Django or the rest of the codebase. We do this by passing a
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tracking function to them. This generates a closure for each request
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that gives a clean interface on both sides.
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'''
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def f(event_type, event):
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return track.views.server_track(request, event_type, event, page='x_module')
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return f
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def grade_histogram(module_id):
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''' Print out a histogram of grades on a given problem.
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Part of staff member debug info.
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'''
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from django.db import connection
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cursor = connection.cursor()
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cursor.execute("select courseware_studentmodule.grade,COUNT(courseware_studentmodule.student_id) from courseware_studentmodule where courseware_studentmodule.module_id=%s group by courseware_studentmodule.grade", [module_id])
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grades = list(cursor.fetchall())
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grades.sort(key=lambda x:x[0]) # Probably not necessary
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if (len(grades) == 1 and grades[0][0] == None):
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return []
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return grades
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def render_x_module(user, request, xml_module, module_object_preload):
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''' Generic module for extensions. This renders to HTML. '''
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# Check if problem has an instance in DB
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module_type=xml_module.tag
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module_class=courseware.modules.get_module_class(module_type)
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module_id=xml_module.get('id') #module_class.id_attribute) or ""
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# Grab state from database
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smod = object_cache(module_object_preload,
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user,
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module_type,
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module_id)
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if not smod: # If nothing in the database...
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state=None
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else:
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state = smod.state
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# Create a new instance
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ajax_url = settings.MITX_ROOT_URL + '/modx/'+module_type+'/'+module_id+'/'
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system = I4xSystem(track_function = make_track_function(request),
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render_function = lambda x: render_module(user, request, x, module_object_preload),
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ajax_url = ajax_url,
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filestore = None
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)
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instance=module_class(system,
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etree.tostring(xml_module),
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module_id,
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state=state)
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# If instance wasn't already in the database, and this
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# isn't a guest user, create it
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if not smod and user.is_authenticated():
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smod=StudentModule(student=user,
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module_type = module_type,
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module_id=module_id,
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state=instance.get_state())
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smod.save()
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module_object_preload.append(smod)
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# Grab content
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content = instance.get_html()
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init_js = instance.get_init_js()
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destory_js = instance.get_destroy_js()
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# special extra information about each problem, only for users who are staff
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if user.is_staff:
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histogram = grade_histogram(module_id)
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render_histogram = len(histogram) > 0
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content=content+render_to_string("staff_problem_info.html", {'xml':etree.tostring(xml_module),
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'module_id' : module_id,
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'render_histogram' : render_histogram})
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if render_histogram:
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init_js = init_js+render_to_string("staff_problem_histogram.js", {'histogram' : histogram,
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'module_id' : module_id})
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content = {'content':content,
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"destroy_js":destory_js,
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'init_js':init_js,
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'type':module_type}
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return content
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def render_module(user, request, module, module_object_preload):
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''' Generic dispatch for internal modules. '''
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if module==None :
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return {"content":""}
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return render_x_module(user, request, module, module_object_preload)
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