515 lines
18 KiB
Python
515 lines
18 KiB
Python
import datetime
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import dateutil
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import dateutil.parser
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import json
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import logging
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import traceback
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import re
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import StringIO
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from datetime import timedelta
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from lxml import etree
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from x_module import XModule, XModuleDescriptor
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from progress import Progress
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from capa.capa_problem import LoncapaProblem
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from capa.responsetypes import StudentInputError
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log = logging.getLogger("mitx.courseware")
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#-----------------------------------------------------------------------------
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TIMEDELTA_REGEX = re.compile(r'^((?P<days>\d+?) day(?:s?))?(\s)?((?P<hours>\d+?) hour(?:s?))?(\s)?((?P<minutes>\d+?) minute(?:s)?)?(\s)?((?P<seconds>\d+?) second(?:s)?)?$')
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def only_one(lst, default="", process=lambda x: x):
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"""
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If lst is empty, returns default
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If lst has a single element, applies process to that element and returns it
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Otherwise, raises an exeception
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"""
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if len(lst) == 0:
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return default
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elif len(lst) == 1:
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return process(lst[0])
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else:
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raise Exception('Malformed XML')
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def parse_timedelta(time_str):
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"""
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time_str: A string with the following components:
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<D> day[s] (optional)
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<H> hour[s] (optional)
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<M> minute[s] (optional)
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<S> second[s] (optional)
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Returns a datetime.timedelta parsed from the string
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"""
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parts = TIMEDELTA_REGEX.match(time_str)
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if not parts:
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return
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parts = parts.groupdict()
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time_params = {}
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for (name, param) in parts.iteritems():
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if param:
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time_params[name] = int(param)
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return timedelta(**time_params)
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class ComplexEncoder(json.JSONEncoder):
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def default(self, obj):
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if isinstance(obj, complex):
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return "{real:.7g}{imag:+.7g}*j".format(real=obj.real, imag=obj.imag)
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return json.JSONEncoder.default(self, obj)
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class ModuleDescriptor(XModuleDescriptor):
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pass
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class Module(XModule):
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''' Interface between capa_problem and x_module. Originally a hack
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meant to be refactored out, but it seems to be serving a useful
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prupose now. We can e.g .destroy and create the capa_problem on a
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reset.
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'''
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id_attribute = "filename"
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@classmethod
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def get_xml_tags(c):
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return ["problem"]
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def get_state(self):
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state = self.lcp.get_state()
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state['attempts'] = self.attempts
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return json.dumps(state)
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def get_score(self):
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return self.lcp.get_score()
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def max_score(self):
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return self.lcp.get_max_score()
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def get_progress(self):
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''' For now, just return score / max_score
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'''
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d = self.get_score()
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score = d['score']
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total = d['total']
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if total > 0:
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return Progress(score, total)
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return None
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def get_html(self):
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return self.system.render_template('problem_ajax.html', {
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'id': self.item_id,
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'ajax_url': self.ajax_url,
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})
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def get_problem_html(self, encapsulate=True):
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'''Return html for the problem. Adds check, reset, save buttons
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as necessary based on the problem config and state.'''
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html = self.lcp.get_html()
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content = {'name': self.name,
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'html': html,
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'weight': self.weight,
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}
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# We using strings as truthy values, because the terminology of the check button
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# is context-specific.
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check_button = "Grade" if self.max_attempts else "Check"
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reset_button = True
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save_button = True
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# If we're after deadline, or user has exhausted attempts,
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# question is read-only.
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if self.closed():
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check_button = False
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reset_button = False
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save_button = False
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# User submitted a problem, and hasn't reset. We don't want
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# more submissions.
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if self.lcp.done and self.rerandomize == "always":
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check_button = False
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save_button = False
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# Only show the reset button if pressing it will show different values
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if self.rerandomize != 'always':
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reset_button = False
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# User hasn't submitted an answer yet -- we don't want resets
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if not self.lcp.done:
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reset_button = False
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# We don't need a "save" button if infinite number of attempts and non-randomized
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if self.max_attempts is None and self.rerandomize != "always":
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save_button = False
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# Check if explanation is available, and if so, give a link
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explain = ""
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if self.lcp.done and self.explain_available == 'attempted':
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explain = self.explanation
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if self.closed() and self.explain_available == 'closed':
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explain = self.explanation
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if len(explain) == 0:
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explain = False
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context = {'problem': content,
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'id': self.item_id,
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'check_button': check_button,
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'reset_button': reset_button,
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'save_button': save_button,
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'answer_available': self.answer_available(),
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'ajax_url': self.ajax_url,
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'attempts_used': self.attempts,
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'attempts_allowed': self.max_attempts,
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'explain': explain,
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'progress': self.get_progress(),
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}
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html = self.system.render_template('problem.html', context)
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if encapsulate:
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html = '<div id="problem_{id}" class="problem" data-url="{ajax_url}">'.format(
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id=self.item_id, ajax_url=self.ajax_url) + html + "</div>"
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return html
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def __init__(self, system, xml, item_id, state=None):
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XModule.__init__(self, system, xml, item_id, state)
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self.attempts = 0
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self.max_attempts = None
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dom2 = etree.fromstring(xml)
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self.explanation = "problems/" + only_one(dom2.xpath('/problem/@explain'),
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default="closed")
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# TODO: Should be converted to: self.explanation=only_one(dom2.xpath('/problem/@explain'), default="closed")
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self.explain_available = only_one(dom2.xpath('/problem/@explain_available'))
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display_due_date_string = only_one(dom2.xpath('/problem/@due'))
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if len(display_due_date_string) > 0:
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self.display_due_date = dateutil.parser.parse(display_due_date_string)
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#log.debug("Parsed " + display_due_date_string + " to " + str(self.display_due_date))
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else:
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self.display_due_date = None
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grace_period_string = only_one(dom2.xpath('/problem/@graceperiod'))
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if len(grace_period_string) >0 and self.display_due_date:
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self.grace_period = parse_timedelta(grace_period_string)
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self.close_date = self.display_due_date + self.grace_period
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#log.debug("Then parsed " + grace_period_string + " to closing date" + str(self.close_date))
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else:
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self.grace_period = None
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self.close_date = self.display_due_date
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self.max_attempts = only_one(dom2.xpath('/problem/@attempts'))
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if len(self.max_attempts) > 0:
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self.max_attempts = int(self.max_attempts)
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else:
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self.max_attempts = None
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self.show_answer = only_one(dom2.xpath('/problem/@showanswer'))
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if self.show_answer == "":
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self.show_answer = "closed"
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self.rerandomize = only_one(dom2.xpath('/problem/@rerandomize'))
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if self.rerandomize == "" or self.rerandomize=="always" or self.rerandomize=="true":
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self.rerandomize="always"
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elif self.rerandomize=="false" or self.rerandomize=="per_student":
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self.rerandomize="per_student"
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elif self.rerandomize=="never":
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self.rerandomize="never"
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else:
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raise Exception("Invalid rerandomize attribute "+self.rerandomize)
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if state!=None:
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state=json.loads(state)
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if state!=None and 'attempts' in state:
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self.attempts=state['attempts']
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# TODO: Should be: self.filename=only_one(dom2.xpath('/problem/@filename'))
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self.filename= "problems/"+only_one(dom2.xpath('/problem/@filename'))+".xml"
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self.name=only_one(dom2.xpath('/problem/@name'))
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self.weight=only_one(dom2.xpath('/problem/@weight'))
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if self.rerandomize == 'never':
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seed = 1
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elif self.rerandomize == "per_student" and hasattr(system, 'id'):
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seed = system.id
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else:
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seed = None
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try:
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fp = self.filestore.open(self.filename)
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except Exception,err:
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log.exception('[courseware.capa.capa_module.Module.init] error %s: cannot open file %s' % (err,self.filename))
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if self.DEBUG:
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# create a dummy problem instead of failing
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fp = StringIO.StringIO('<problem><text><font color="red" size="+2">Problem file %s is missing</font></text></problem>' % self.filename)
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fp.name = "StringIO"
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else:
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raise
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try:
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self.lcp=LoncapaProblem(fp, self.item_id, state, seed = seed, system=self.system)
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except Exception,err:
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msg = '[courseware.capa.capa_module.Module.init] error %s: cannot create LoncapaProblem %s' % (err,self.filename)
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log.exception(msg)
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if self.DEBUG:
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msg = '<p>%s</p>' % msg.replace('<','<')
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msg += '<p><pre>%s</pre></p>' % traceback.format_exc().replace('<','<')
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# create a dummy problem with error message instead of failing
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fp = StringIO.StringIO('<problem><text><font color="red" size="+2">Problem file %s has an error:</font>%s</text></problem>' % (self.filename,msg))
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fp.name = "StringIO"
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self.lcp=LoncapaProblem(fp, self.item_id, state, seed = seed, system=self.system)
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else:
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raise
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def handle_ajax(self, dispatch, get):
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'''
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This is called by courseware.module_render, to handle an AJAX call.
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"get" is request.POST.
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Returns a json dictionary:
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{ 'progress_changed' : True/False,
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'progress' : 'none'/'in_progress'/'done',
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<other request-specific values here > }
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'''
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handlers = {
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'problem_get': self.get_problem,
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'problem_check': self.check_problem,
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'problem_reset': self.reset_problem,
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'problem_save': self.save_problem,
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'problem_show': self.get_answer,
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}
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if dispatch not in handlers:
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return 'Error'
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before = self.get_progress()
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d = handlers[dispatch](get)
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after = self.get_progress()
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d.update({
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'progress_changed' : after != before,
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'progress_status' : Progress.to_js_status_str(after),
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})
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return json.dumps(d, cls=ComplexEncoder)
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def closed(self):
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''' Is the student still allowed to submit answers? '''
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if self.attempts == self.max_attempts:
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return True
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if self.close_date is not None and datetime.datetime.utcnow() > self.close_date:
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return True
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return False
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def answer_available(self):
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''' Is the user allowed to see an answer?
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'''
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if self.show_answer == '':
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return False
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if self.show_answer == "never":
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return False
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if self.show_answer == 'attempted':
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return self.attempts > 0
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if self.show_answer == 'answered':
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return self.lcp.done
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if self.show_answer == 'closed':
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return self.closed()
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if self.show_answer == 'always':
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return True
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raise self.system.exception404 #TODO: Not 404
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def get_answer(self, get):
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'''
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For the "show answer" button.
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TODO: show answer events should be logged here, not just in the problem.js
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Returns the answers: {'answers' : answers}
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'''
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if not self.answer_available():
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raise self.system.exception404
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else:
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answers = self.lcp.get_question_answers()
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return {'answers' : answers}
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# Figure out if we should move these to capa_problem?
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def get_problem(self, get):
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''' Return results of get_problem_html, as a simple dict for json-ing.
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{ 'html': <the-html> }
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Used if we want to reconfirm we have the right thing e.g. after
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several AJAX calls.
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'''
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return {'html' : self.get_problem_html(encapsulate=False)}
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@staticmethod
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def make_dict_of_responses(get):
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'''Make dictionary of student responses (aka "answers")
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get is POST dictionary.
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'''
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answers = dict()
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for key in get:
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# e.g. input_resistor_1 ==> resistor_1
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_, _, name = key.partition('_')
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answers[name] = get[key]
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return answers
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def check_problem(self, get):
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''' Checks whether answers to a problem are correct, and
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returns a map of correct/incorrect answers:
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{'success' : bool,
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'contents' : html}
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'''
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event_info = dict()
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event_info['state'] = self.lcp.get_state()
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event_info['filename'] = self.filename
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answers = self.make_dict_of_responses(get)
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event_info['answers'] = answers
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# Too late. Cannot submit
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if self.closed():
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event_info['failure'] = 'closed'
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self.tracker('save_problem_check_fail', event_info)
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# TODO (vshnayder): probably not 404?
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raise self.system.exception404
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# Problem submitted. Student should reset before checking
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# again.
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if self.lcp.done and self.rerandomize == "always":
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event_info['failure'] = 'unreset'
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self.tracker('save_problem_check_fail', event_info)
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raise self.system.exception404
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try:
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old_state = self.lcp.get_state()
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lcp_id = self.lcp.problem_id
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correct_map = self.lcp.grade_answers(answers)
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except StudentInputError as inst:
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# TODO (vshnayder): why is this line here?
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self.lcp = LoncapaProblem(self.filestore.open(self.filename),
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id=lcp_id, state=old_state, system=self.system)
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traceback.print_exc()
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return {'success': inst.message}
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except:
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# TODO: why is this line here?
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self.lcp = LoncapaProblem(self.filestore.open(self.filename),
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id=lcp_id, state=old_state, system=self.system)
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traceback.print_exc()
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raise Exception,"error in capa_module"
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# TODO: Dead code... is this a bug, or just old?
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return {'success':'Unknown Error'}
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self.attempts = self.attempts + 1
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self.lcp.done = True
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# success = correct if ALL questions in this problem are correct
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success = 'correct'
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for answer_id in correct_map:
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if not correct_map.is_correct(answer_id):
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success = 'incorrect'
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event_info['correct_map'] = correct_map.get_dict() # log this in the tracker
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event_info['success'] = success
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self.tracker('save_problem_check', event_info)
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try:
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html = self.get_problem_html(encapsulate=False) # render problem into HTML
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except Exception,err:
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log.error('failed to generate html')
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raise
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return {'success': success,
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'contents': html,
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}
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def save_problem(self, get):
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'''
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Save the passed in answers.
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Returns a dict { 'success' : bool, ['error' : error-msg]},
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with the error key only present if success is False.
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'''
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event_info = dict()
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event_info['state'] = self.lcp.get_state()
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event_info['filename'] = self.filename
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answers = self.make_dict_of_responses(get)
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event_info['answers'] = answers
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# Too late. Cannot submit
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if self.closed():
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event_info['failure'] = 'closed'
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self.tracker('save_problem_fail', event_info)
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return {'success': False,
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'error': "Problem is closed"}
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# Problem submitted. Student should reset before saving
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# again.
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if self.lcp.done and self.rerandomize == "always":
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event_info['failure'] = 'done'
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self.tracker('save_problem_fail', event_info)
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return {'success' : False,
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'error' : "Problem needs to be reset prior to save."}
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self.lcp.student_answers = answers
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# TODO: should this be save_problem_fail? Looks like success to me...
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self.tracker('save_problem_fail', event_info)
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return {'success': True}
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def reset_problem(self, get):
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''' Changes problem state to unfinished -- removes student answers,
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and causes problem to rerender itself.
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Returns problem html as { 'html' : html-string }.
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'''
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event_info = dict()
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event_info['old_state'] = self.lcp.get_state()
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event_info['filename'] = self.filename
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if self.closed():
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event_info['failure'] = 'closed'
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self.tracker('reset_problem_fail', event_info)
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return "Problem is closed"
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if not self.lcp.done:
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event_info['failure'] = 'not_done'
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self.tracker('reset_problem_fail', event_info)
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return "Refresh the page and make an attempt before resetting."
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self.lcp.do_reset()
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if self.rerandomize == "always":
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# reset random number generator seed (note the self.lcp.get_state() in next line)
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self.lcp.seed=None
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self.lcp = LoncapaProblem(self.filestore.open(self.filename),
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self.item_id, self.lcp.get_state(), system=self.system)
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event_info['new_state'] = self.lcp.get_state()
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self.tracker('reset_problem', event_info)
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return {'html' : self.get_problem_html(encapsulate=False)}
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