6b474724ac
By transparently proxying between the XModuleDescriptor and the XModule, and between their runtimes, we can make them act as a single class, so that we can swap in an actual XBlock instead.
189 lines
7.6 KiB
Python
189 lines
7.6 KiB
Python
"""
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Functions that can are used to modify XBlock fragments for use in the LMS and Studio
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"""
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import datetime
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import json
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import logging
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import static_replace
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from django.conf import settings
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from django.utils.timezone import UTC
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from mitxmako.shortcuts import render_to_string
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from xblock.fragment import Fragment
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from xmodule.seq_module import SequenceModule
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from xmodule.vertical_module import VerticalModule
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log = logging.getLogger(__name__)
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def wrap_fragment(fragment, new_content):
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"""
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Returns a new Fragment that has `new_content` and all
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as its content, and all of the resources from fragment
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"""
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wrapper_frag = Fragment(content=new_content)
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wrapper_frag.add_frag_resources(fragment)
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return wrapper_frag
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def wrap_xmodule(template, block, view, frag, context): # pylint: disable=unused-argument
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"""
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Wraps the results of get_html in a standard <section> with identifying
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data so that the appropriate javascript module can be loaded onto it.
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get_html: An XModule.get_html method or an XModuleDescriptor.get_html method
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module: An XModule
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template: A template that takes the variables:
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content: the results of get_html,
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display_name: the display name of the xmodule, if available (None otherwise)
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class_: the module class name
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module_name: the js_module_name of the module
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"""
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# If XBlock generated this class, then use the first baseclass
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# as the name (since that's the original, unmixed class)
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class_name = getattr(block, 'unmixed_class', block.__class__).__name__
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template_context = {
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'content': frag.content,
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'display_name': block.display_name,
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'class_': class_name,
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'module_name': block.js_module_name,
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}
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return wrap_fragment(frag, render_to_string(template, template_context))
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def replace_jump_to_id_urls(course_id, jump_to_id_base_url, block, view, frag, context): # pylint: disable=unused-argument
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"""
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This will replace a link between courseware in the format
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/jump_to/<id> with a URL for a page that will correctly redirect
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This is similar to replace_course_urls, but much more flexible and
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durable for Studio authored courses. See more comments in static_replace.replace_jump_to_urls
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course_id: The course_id in which this rewrite happens
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jump_to_id_base_url:
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A app-tier (e.g. LMS) absolute path to the base of the handler that will perform the
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redirect. e.g. /courses/<org>/<course>/<run>/jump_to_id. NOTE the <id> will be appended to
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the end of this URL at re-write time
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output: a new :class:`~xblock.fragment.Fragment` that modifies `frag` with
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content that has been update with /jump_to links replaced
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"""
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return wrap_fragment(frag, static_replace.replace_jump_to_id_urls(frag.content, course_id, jump_to_id_base_url))
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def replace_course_urls(course_id, block, view, frag, context): # pylint: disable=unused-argument
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"""
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Updates the supplied module with a new get_html function that wraps
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the old get_html function and substitutes urls of the form /course/...
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with urls that are /courses/<course_id>/...
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"""
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return wrap_fragment(frag, static_replace.replace_course_urls(frag.content, course_id))
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def replace_static_urls(data_dir, block, view, frag, context, course_id=None, static_asset_path=''): # pylint: disable=unused-argument
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"""
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Updates the supplied module with a new get_html function that wraps
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the old get_html function and substitutes urls of the form /static/...
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with urls that are /static/<prefix>/...
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"""
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return wrap_fragment(frag, static_replace.replace_static_urls(
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frag.content,
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data_dir,
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course_id,
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static_asset_path=static_asset_path
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))
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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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q = """SELECT courseware_studentmodule.grade,
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COUNT(courseware_studentmodule.student_id)
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FROM courseware_studentmodule
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WHERE courseware_studentmodule.module_id=%s
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GROUP BY courseware_studentmodule.grade"""
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# Passing module_id this way prevents sql-injection.
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cursor.execute(q, [module_id])
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grades = list(cursor.fetchall())
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grades.sort(key=lambda x: x[0]) # Add ORDER BY to sql query?
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if len(grades) >= 1 and grades[0][0] is None:
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return []
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return grades
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def add_histogram(user, block, view, frag, context): # pylint: disable=unused-argument
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"""
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Updates the supplied module with a new get_html function that wraps
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the output of the old get_html function with additional information
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for admin users only, including a histogram of student answers and the
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definition of the xmodule
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Does nothing if module is a SequenceModule or a VerticalModule.
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"""
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# TODO: make this more general, eg use an XModule attribute instead
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if isinstance(block, (SequenceModule, VerticalModule)):
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return frag
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block_id = block.id
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if block.has_score:
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histogram = grade_histogram(block_id)
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render_histogram = len(histogram) > 0
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else:
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histogram = None
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render_histogram = False
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if settings.MITX_FEATURES.get('ENABLE_LMS_MIGRATION'):
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[filepath, filename] = getattr(block, 'xml_attributes', {}).get('filename', ['', None])
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osfs = block.system.filestore
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if filename is not None and osfs.exists(filename):
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# if original, unmangled filename exists then use it (github
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# doesn't like symlinks)
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filepath = filename
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data_dir = osfs.root_path.rsplit('/')[-1]
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giturl = block.giturl or 'https://github.com/MITx'
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edit_link = "%s/%s/tree/master/%s" % (giturl, data_dir, filepath)
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else:
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edit_link = False
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# Need to define all the variables that are about to be used
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giturl = ""
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data_dir = ""
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source_file = block.source_file # source used to generate the problem XML, eg latex or word
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# useful to indicate to staff if problem has been released or not
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# TODO (ichuang): use _has_access_descriptor.can_load in lms.courseware.access, instead of now>mstart comparison here
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now = datetime.datetime.now(UTC())
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is_released = "unknown"
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mstart = block.start
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if mstart is not None:
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is_released = "<font color='red'>Yes!</font>" if (now > mstart) else "<font color='green'>Not yet</font>"
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staff_context = {'fields': [(name, field.read_from(block)) for name, field in block.fields.items()],
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'xml_attributes': getattr(block, 'xml_attributes', {}),
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'location': block.location,
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'xqa_key': block.xqa_key,
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'source_file': source_file,
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'source_url': '%s/%s/tree/master/%s' % (giturl, data_dir, source_file),
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'category': str(block.__class__.__name__),
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# Template uses element_id in js function names, so can't allow dashes
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'element_id': block.location.html_id().replace('-', '_'),
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'edit_link': edit_link,
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'user': user,
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'xqa_server': settings.MITX_FEATURES.get('USE_XQA_SERVER', 'http://xqa:server@content-qa.mitx.mit.edu/xqa'),
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'histogram': json.dumps(histogram),
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'render_histogram': render_histogram,
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'block_content': frag.content,
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'is_released': is_released,
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}
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return wrap_fragment(frag, render_to_string("staff_problem_info.html", staff_context))
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