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# Author: Matt Giuca, Will Grant
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"""Database utilities and content classes.
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Database Classes and Utilities for Storm ORM
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This module provides all of the classes which map to database tables.
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It also provides miscellaneous utility functions for database interaction.
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from storm.locals import create_database, Store, Int, Unicode, DateTime, \
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Reference, ReferenceSet, Bool, Storm, Desc
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from storm.expr import Select, Max
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from storm.exceptions import NotOneError, IntegrityError
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from ivle.worksheet.rst import rst
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__all__ = ['get_store',
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'Subject', 'Semester', 'Offering', 'Enrolment',
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'ProjectSet', 'Project', 'ProjectGroup', 'ProjectGroupMembership',
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'Assessed', 'ProjectSubmission', 'ProjectExtension',
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'Exercise', 'Worksheet', 'WorksheetExercise',
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'ExerciseSave', 'ExerciseAttempt',
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'TestCase', 'TestSuite', 'TestSuiteVar'
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'AlreadyEnrolledError'
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def _kwarg_init(self, **kwargs):
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% (self.__class__.__name__, k))
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setattr(self, k, v)
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def get_conn_string(config):
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"""Create a Storm connection string to the IVLE database
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@param config: The IVLE configuration.
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if config['database']['username']:
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clusterstr += config['database']['username']
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if config['database']['password']:
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clusterstr += ':' + config['database']['password']
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host = config['database']['host'] or 'localhost'
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port = config['database']['port'] or 5432
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clusterstr += '%s:%d' % (host, port)
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return "postgres://%s/%s" % (clusterstr, config['database']['name'])
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def get_store(config):
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"""Create a Storm store connected to the IVLE database.
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@param config: The IVLE configuration.
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return Store(create_database(get_conn_string(config)))
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def get_conn_string():
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Returns the Storm connection string, generated from the conf file.
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return "postgres://%s:%s@%s:%d/%s" % (ivle.conf.db_user,
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ivle.conf.db_password, ivle.conf.db_host, ivle.conf.db_port,
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Open a database connection and transaction. Return a storm.store.Store
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instance connected to the configured IVLE database.
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return Store(create_database(get_conn_string()))
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"""An IVLE user account."""
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Represents an IVLE user.
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__storm_table__ = "login"
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id = Int(primary=True, name="loginid")
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passhash = Unicode()
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pass_exp = DateTime()
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'''A sanely ordered list of all of the user's enrolments.'''
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return self._get_enrolments(False)
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def get_projects(self, offering=None, active_only=True):
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"""Find projects that the user can submit.
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This will include projects for offerings in which the user is
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enrolled, as long as the project is not in a project set which has
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groups (ie. if maximum number of group members is 0).
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@param active_only: Whether to only search active offerings.
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@param offering: An optional offering to restrict the search to.
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return Store.of(self).find(Project,
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Project.project_set_id == ProjectSet.id,
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ProjectSet.max_students_per_group == None,
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ProjectSet.offering_id == Offering.id,
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(offering is None) or (Offering.id == offering.id),
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Semester.id == Offering.semester_id,
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(not active_only) or (Semester.state == u'current'),
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Enrolment.offering_id == Offering.id,
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Enrolment.user_id == self.id)
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def hash_password(password):
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"""Hash a password with MD5."""
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return hashlib.md5(password).hexdigest()
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return md5.md5(password).hexdigest()
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def get_by_login(cls, store, login):
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"""Find a user in a store by login name."""
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Get the User from the db associated with a given store and
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return store.find(cls, cls.login == unicode(login)).one()
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def get_permissions(self, user):
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"""Determine privileges held by a user over this object.
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If the user requesting privileges is this user or an admin,
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they may do everything. Otherwise they may do nothing.
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if user and user.admin or user is self:
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return set(['view_public', 'view', 'edit', 'submit_project'])
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return set(['view_public'])
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# SUBJECTS AND ENROLMENTS #
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class Subject(Storm):
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"""A subject (or course) which is run in some semesters."""
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__storm_table__ = "subject"
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id = Int(primary=True, name="subjectid")
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def __repr__(self):
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return "<%s '%s'>" % (type(self).__name__, self.short_name)
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def get_permissions(self, user):
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"""Determine privileges held by a user over this object.
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If the user requesting privileges is an admin, they may edit.
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Otherwise they may only read.
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def active_offerings(self):
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"""Find active offerings for this subject.
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Return a sequence of currently active offerings for this subject
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(offerings whose semester.state is "current"). There should be 0 or 1
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elements in this sequence, but it's possible there are more.
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return self.offerings.find(Offering.semester_id == Semester.id,
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Semester.state == u'current')
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def offering_for_semester(self, year, semester):
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"""Get the offering for the given year/semester, or None.
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@param year: A string representation of the year.
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@param semester: A string representation of the semester.
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return self.offerings.find(Offering.semester_id == Semester.id,
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Semester.year == unicode(year),
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Semester.semester == unicode(semester)).one()
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class Semester(Storm):
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"""A semester in which subjects can be run."""
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__storm_table__ = "semester"
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id = Int(primary=True, name="semesterid")
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semester = Unicode()
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offerings = ReferenceSet(id, 'Offering.semester_id')
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enrolments = ReferenceSet(id,
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'Offering.semester_id',
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'Enrolment.offering_id')
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__init__ = _kwarg_init
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project_sets = ReferenceSet(id, 'ProjectSet.offering_id')
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worksheets = ReferenceSet(id,
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'Worksheet.offering_id',
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__init__ = _kwarg_init
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def __repr__(self):
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return "<%s %r in %r>" % (type(self).__name__, self.subject,
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def enrol(self, user, role=u'student'):
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"""Enrol a user in this offering.
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Enrolments handle both the staff and student cases. The role controls
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the privileges granted by this enrolment.
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enrolment = Store.of(self).find(Enrolment,
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Enrolment.user_id == user.id,
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Enrolment.offering_id == self.id).one()
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if enrolment is None:
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enrolment = Enrolment(user=user, offering=self)
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self.enrolments.add(enrolment)
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enrolment.active = True
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enrolment.role = role
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def unenrol(self, user):
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'''Unenrol a user from this offering.'''
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enrolment = Store.of(self).find(Enrolment,
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Enrolment.user_id == user.id,
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Enrolment.offering_id == self.id).one()
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Store.of(enrolment).remove(enrolment)
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def get_permissions(self, user):
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enrolment = self.get_enrolment(user)
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if enrolment or user.admin:
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if (enrolment and enrolment.role in (u'tutor', u'lecturer')) \
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# XXX Bug #493945 -- should tutors have these permissions?
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# Potentially move into the next category (lecturer & admin)
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perms.add('enrol') # Can see enrolment screen at all
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perms.add('enrol_student') # Can enrol students
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if (enrolment and enrolment.role in (u'lecturer')) or user.admin:
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perms.add('enrol_tutor') # Can enrol tutors
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perms.add('enrol_lecturer') # Can enrol lecturers
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def get_enrolment(self, user):
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"""Find the user's enrolment in this offering."""
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enrolment = self.enrolments.find(user=user).one()
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def get_members_by_role(self, role):
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return Store.of(self).find(User,
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Enrolment.user_id == User.id,
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Enrolment.offering_id == self.id,
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Enrolment.role == role
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).order_by(User.login)
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return self.get_members_by_role(u'student')
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def enrol(self, user):
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'''Enrol a user in this offering.'''
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# We'll get a horrible database constraint violation error if we try
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# to add a second enrolment.
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if Store.of(self).find(Enrolment,
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Enrolment.user_id == user.id,
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Enrolment.offering_id == self.id).count() == 1:
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raise AlreadyEnrolledError()
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e = Enrolment(user=user, offering=self, active=True)
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self.enrolments.add(e)
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class Enrolment(Storm):
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"""An enrolment of a user in an offering.
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This represents the roles of both staff and students.
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__storm_table__ = "enrolment"
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__storm_primary__ = "user_id", "offering_id"
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return "<%s %d in %r>" % (type(self).__name__, self.id,
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def get_permissions(self, user):
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return self.offering.get_permissions(user)
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return self.max_students_per_group is not None
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"""Get the entities (groups or users) assigned to submit this project.
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This will be a Storm ResultSet.
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#If its a solo project, return everyone in offering
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return self.project_groups
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return self.offering.students
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class Project(Storm):
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"""A student project for which submissions can be made."""
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__storm_table__ = "project"
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id = Int(name="projectid", primary=True)
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short_name = Unicode()
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synopsis = Unicode()
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project_set_id = Int(name="projectsetid")
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project_set = Reference(project_set_id, ProjectSet.id)
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deadline = DateTime()
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assesseds = ReferenceSet(id, 'Assessed.project_id')
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submissions = ReferenceSet(id,
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'Assessed.project_id',
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'ProjectSubmission.assessed_id')
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__init__ = _kwarg_init
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def __repr__(self):
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return "<%s '%s' in %r>" % (type(self).__name__, self.short_name,
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return "<%s '%s' in %r>" % (type(self).__name__, self.synopsis,
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self.project_set.offering)
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def can_submit(self, principal):
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return (self in principal.get_projects() and
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self.deadline > datetime.datetime.now())
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def submit(self, principal, path, revision, who):
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"""Submit a Subversion path and revision to a project.
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@param principal: The owner of the Subversion repository, and the
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entity on behalf of whom the submission is being made
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@param path: A path within that repository to submit.
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@param revision: The revision of that path to submit.
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@param who: The user who is actually making the submission.
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if not self.can_submit(principal):
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raise Exception('cannot submit')
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a = Assessed.get(Store.of(self), principal, self)
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ps = ProjectSubmission()
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ps.revision = revision
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ps.date_submitted = datetime.datetime.now()
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def get_permissions(self, user):
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return self.project_set.offering.get_permissions(user)
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def latest_submissions(self):
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"""Return the latest submission for each Assessed."""
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return Store.of(self).find(ProjectSubmission,
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Assessed.project_id == self.id,
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ProjectSubmission.assessed_id == Assessed.id,
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ProjectSubmission.date_submitted == Select(
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Max(ProjectSubmission.date_submitted),
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ProjectSubmission.assessed_id == Assessed.id,
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tables=ProjectSubmission
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class ProjectGroup(Storm):
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"""A group of students working together on a project."""
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__storm_table__ = "project_group"
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id = Int(name="groupid", primary=True)
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return "<%s %s in %r>" % (type(self).__name__, self.name,
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self.project_set.offering)
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def display_name(self):
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"""Returns the "nice name" of the user or group."""
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def short_name(self):
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"""Returns the database "identifier" name of the user or group."""
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def get_projects(self, offering=None, active_only=True):
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'''Find projects that the group can submit.
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This will include projects in the project set which owns this group,
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unless the project set disallows groups (in which case none will be
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@param active_only: Whether to only search active offerings.
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@param offering: An optional offering to restrict the search to.
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return Store.of(self).find(Project,
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Project.project_set_id == ProjectSet.id,
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ProjectSet.id == self.project_set.id,
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ProjectSet.max_students_per_group != None,
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ProjectSet.offering_id == Offering.id,
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(offering is None) or (Offering.id == offering.id),
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Semester.id == Offering.semester_id,
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(not active_only) or (Semester.state == u'current'))
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def get_permissions(self, user):
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if user.admin or user in self.members:
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return set(['submit_project'])
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class ProjectGroupMembership(Storm):
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"""A student's membership in a project group."""
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__storm_table__ = "group_member"
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__storm_primary__ = "user_id", "project_group_id"
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return "<%s %r in %r>" % (type(self).__name__, self.user,
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self.project_group)
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class Assessed(Storm):
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"""A composite of a user or group combined with a project.
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Each project submission and extension refers to an Assessed. It is the
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sole specifier of the repository and project.
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__storm_table__ = "assessed"
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id = Int(name="assessedid", primary=True)
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user_id = Int(name="loginid")
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user = Reference(user_id, User.id)
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project_group_id = Int(name="groupid")
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project_group = Reference(project_group_id, ProjectGroup.id)
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project_id = Int(name="projectid")
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project = Reference(project_id, Project.id)
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extensions = ReferenceSet(id, 'ProjectExtension.assessed_id')
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submissions = ReferenceSet(id, 'ProjectSubmission.assessed_id')
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return "<%s %r in %r>" % (type(self).__name__,
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self.user or self.project_group, self.project)
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"""True if the Assessed is a group, False if it is a user."""
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return self.project_group is not None
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return self.project_group or self.user
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def get(cls, store, principal, project):
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"""Find or create an Assessed for the given user or group and project.
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@param principal: The user or group.
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@param project: The project.
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if t not in (User, ProjectGroup):
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raise AssertionError('principal must be User or ProjectGroup')
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(t is User) or (cls.project_group_id == principal.id),
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(t is ProjectGroup) or (cls.user_id == principal.id),
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Project.id == project.id).one()
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a.project_group = principal
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class ProjectExtension(Storm):
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"""An extension granted to a user or group on a particular project.
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The user or group and project are specified by the Assessed.
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__storm_table__ = "project_extension"
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id = Int(name="extensionid", primary=True)
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assessed_id = Int(name="assessedid")
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assessed = Reference(assessed_id, Assessed.id)
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deadline = DateTime()
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approver_id = Int(name="approver")
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approver = Reference(approver_id, User.id)
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class ProjectSubmission(Storm):
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"""A submission from a user or group repository to a particular project.
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The content of a submission is a single path and revision inside a
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repository. The repository is that owned by the submission's user and
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group, while the path and revision are explicit.
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The user or group and project are specified by the Assessed.
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__storm_table__ = "project_submission"
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id = Int(name="submissionid", primary=True)
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assessed_id = Int(name="assessedid")
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assessed = Reference(assessed_id, Assessed.id)
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submitter_id = Int(name="submitter")
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submitter = Reference(submitter_id, User.id)
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date_submitted = DateTime()
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# WORKSHEETS AND EXERCISES #
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class Exercise(Storm):
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"""An exercise for students to complete in a worksheet.
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An exercise may be present in any number of worksheets.
739
__storm_table__ = "exercise"
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id = Unicode(primary=True, name="identifier")
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description = Unicode()
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worksheet_exercises = ReferenceSet(id,
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'WorksheetExercise.exercise_id')
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# Note: Table "problem" is called "Exercise" in the Object layer, since
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# it's called that everywhere else.
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__storm_table__ = "problem"
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id = Int(primary=True, name="problemid")
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name = Unicode(name="identifier")
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worksheets = ReferenceSet(id,
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'WorksheetExercise.exercise_id',
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test_suites = ReferenceSet(id,
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'TestSuite.exercise_id',
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__init__ = _kwarg_init
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def __repr__(self):
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388
return "<%s %s>" % (type(self).__name__, self.name)
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def get_permissions(self, user):
773
elif u'lecturer' in set((e.role for e in user.active_enrolments)):
776
elif u'tutor' in set((e.role for e in user.active_enrolments)):
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def get_description(self):
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"""Return the description interpreted as reStructuredText."""
784
return rst(self.description)
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"""Deletes the exercise, providing it has no associated worksheets."""
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if (self.worksheet_exercises.count() > 0):
789
raise IntegrityError()
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for suite in self.test_suites:
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Store.of(self).remove(self)
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def get_by_name(cls, store, name):
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Get the Exercise from the db associated with a given store and name.
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If the exercise is not in the database, creates it and inserts it
397
ex = store.find(cls, cls.name == unicode(name)).one()
400
ex = Exercise(name=unicode(name))
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class Worksheet(Storm):
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"""A worksheet with exercises for students to complete.
797
Worksheets are owned by offerings.
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__storm_table__ = "worksheet"
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id = Int(primary=True, name="worksheetid")
803
offering_id = Int(name="offeringid")
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identifier = Unicode()
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# XXX subject is not linked to a Subject object. This is a property of
410
# the database, and will be refactored.
412
name = Unicode(name="identifier")
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assessable = Bool()
811
attempts = ReferenceSet(id, "ExerciseAttempt.worksheetid")
812
offering = Reference(offering_id, 'Offering.id')
814
all_worksheet_exercises = ReferenceSet(id,
416
exercises = ReferenceSet(id,
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'WorksheetExercise.worksheet_id',
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'WorksheetExercise.exercise_id',
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# Use worksheet_exercises to get access to the WorksheetExercise objects
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# binding worksheets to exercises. This is required to access the
423
worksheet_exercises = ReferenceSet(id,
815
424
'WorksheetExercise.worksheet_id')
817
# Use worksheet_exercises to get access to the *active* WorksheetExercise
818
# objects binding worksheets to exercises. This is required to access the
822
def worksheet_exercises(self):
823
return self.all_worksheet_exercises.find(active=True)
825
426
__init__ = _kwarg_init
827
428
def __repr__(self):
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429
return "<%s %s>" % (type(self).__name__, self.name)
830
def remove_all_exercises(self):
831
"""Remove all exercises from this worksheet.
431
# XXX Refactor this - make it an instance method of Subject rather than a
432
# class method of Worksheet. Can't do that now because Subject isn't
433
# linked referentially to the Worksheet.
435
def get_by_name(cls, store, subjectname, worksheetname):
437
Get the Worksheet from the db associated with a given store, subject
438
name and worksheet name.
440
return store.find(cls, cls.subject == unicode(subjectname),
441
cls.name == unicode(worksheetname)).one()
443
def remove_all_exercises(self, store):
445
Remove all exercises from this worksheet.
833
446
This does not delete the exercises themselves. It just removes them
834
447
from the worksheet.
836
store = Store.of(self)
837
for ws_ex in self.all_worksheet_exercises:
838
if ws_ex.saves.count() > 0 or ws_ex.attempts.count() > 0:
839
raise IntegrityError()
840
449
store.find(WorksheetExercise,
841
450
WorksheetExercise.worksheet == self).remove()
843
def get_permissions(self, user):
844
return self.offering.get_permissions(user)
847
"""Returns the xml of this worksheet, converts from rst if required."""
848
if self.format == u'rst':
849
ws_xml = rst(self.data)
855
"""Deletes the worksheet, provided it has no attempts on any exercises.
857
Returns True if delete succeeded, or False if this worksheet has
858
attempts attached."""
859
for ws_ex in self.all_worksheet_exercises:
860
if ws_ex.saves.count() > 0 or ws_ex.attempts.count() > 0:
861
raise IntegrityError()
863
self.remove_all_exercises()
864
Store.of(self).remove(self)
866
452
class WorksheetExercise(Storm):
867
"""A link between a worksheet and one of its exercises.
869
These may be marked optional, in which case the exercise does not count
870
for marking purposes. The sequence number is used to order the worksheet
874
__storm_table__ = "worksheet_exercise"
876
id = Int(primary=True, name="ws_ex_id")
453
__storm_table__ = "worksheet_problem"
454
__storm_primary__ = "worksheet_id", "exercise_id"
878
456
worksheet_id = Int(name="worksheetid")
879
457
worksheet = Reference(worksheet_id, Worksheet.id)
880
exercise_id = Unicode(name="exerciseid")
458
exercise_id = Int(name="problemid")
881
459
exercise = Reference(exercise_id, Exercise.id)
882
460
optional = Bool()
886
saves = ReferenceSet(id, "ExerciseSave.ws_ex_id")
887
attempts = ReferenceSet(id, "ExerciseAttempt.ws_ex_id")
889
462
__init__ = _kwarg_init
891
464
def __repr__(self):
892
465
return "<%s %s in %s>" % (type(self).__name__, self.exercise.name,
893
self.worksheet.identifier)
895
def get_permissions(self, user):
896
return self.worksheet.get_permissions(user)
899
468
class ExerciseSave(Storm):
900
"""A potential exercise solution submitted by a user for storage.
902
This is not an actual tested attempt at an exercise, it's just a save of
906
__storm_table__ = "exercise_save"
907
__storm_primary__ = "ws_ex_id", "user_id"
909
ws_ex_id = Int(name="ws_ex_id")
910
worksheet_exercise = Reference(ws_ex_id, "WorksheetExercise.id")
470
Represents a potential solution to an exercise that a user has submitted
471
to the server for storage.
472
A basic ExerciseSave is just the current saved text for this exercise for
473
this user (doesn't count towards their attempts).
474
ExerciseSave may be extended with additional semantics (such as
477
__storm_table__ = "problem_save"
478
__storm_primary__ = "exercise_id", "user_id", "date"
480
exercise_id = Int(name="problemid")
481
exercise = Reference(exercise_id, Exercise.id)
912
482
user_id = Int(name="loginid")
913
483
user = Reference(user_id, User.id)
914
484
date = DateTime()
921
491
self.exercise.name, self.user.login, self.date.strftime("%c"))
923
493
class ExerciseAttempt(ExerciseSave):
924
"""An attempt at solving an exercise.
926
This is a special case of ExerciseSave, used when the user submits a
927
candidate solution. Like an ExerciseSave, it constitutes exercise solution
930
In addition, it contains information about the result of the submission:
932
- complete - True if this submission was successful, rendering this
933
exercise complete for this user in this worksheet.
934
- active - True if this submission is "active" (usually true).
935
Submissions may be de-activated by privileged users for
936
special reasons, and then they won't count (either as a
937
penalty or success), but will still be stored.
940
__storm_table__ = "exercise_attempt"
941
__storm_primary__ = "ws_ex_id", "user_id", "date"
495
An ExerciseAttempt is a special case of an ExerciseSave. Like an
496
ExerciseSave, it constitutes exercise solution data that the user has
497
submitted to the server for storage.
498
In addition, it contains additional information about the submission.
499
complete - True if this submission was successful, rendering this exercise
500
complete for this user.
501
active - True if this submission is "active" (usually true). Submissions
502
may be de-activated by privileged users for special reasons, and then
503
they won't count (either as a penalty or success), but will still be
506
__storm_table__ = "problem_attempt"
507
__storm_primary__ = "exercise_id", "user_id", "date"
943
509
# The "text" field is the same but has a different name in the DB table
944
510
# for some reason.
945
511
text = Unicode(name="attempt")
946
512
complete = Bool()
949
def get_permissions(self, user):
950
return set(['view']) if user is self.user else set()
952
class TestSuite(Storm):
953
"""A container to group an exercise's test cases.
955
The test suite contains some information on how to test. The function to
956
test, variables to set and stdin data are stored here.
959
__storm_table__ = "test_suite"
960
__storm_primary__ = "exercise_id", "suiteid"
963
exercise_id = Unicode(name="exerciseid")
964
description = Unicode()
968
exercise = Reference(exercise_id, Exercise.id)
969
test_cases = ReferenceSet(suiteid, 'TestCase.suiteid', order_by="seq_no")
970
variables = ReferenceSet(suiteid, 'TestSuiteVar.suiteid', order_by='arg_no')
973
"""Delete this suite, without asking questions."""
974
for vaariable in self.variables:
976
for test_case in self.test_cases:
978
Store.of(self).remove(self)
980
class TestCase(Storm):
981
"""A container for actual tests (see TestCasePart), inside a test suite.
983
It is the lowest level shown to students on their pass/fail status."""
985
__storm_table__ = "test_case"
986
__storm_primary__ = "testid", "suiteid"
990
suite = Reference(suiteid, "TestSuite.suiteid")
993
test_default = Unicode() # Currently unused - only used for file matching.
996
parts = ReferenceSet(testid, "TestCasePart.testid")
998
__init__ = _kwarg_init
1001
for part in self.parts:
1003
Store.of(self).remove(self)
1005
class TestSuiteVar(Storm):
1006
"""A variable used by an exercise test suite.
1008
This may represent a function argument or a normal variable.
1011
__storm_table__ = "suite_variable"
1012
__storm_primary__ = "varid"
1016
var_name = Unicode()
1017
var_value = Unicode()
1018
var_type = Unicode()
1021
suite = Reference(suiteid, "TestSuite.suiteid")
1023
__init__ = _kwarg_init
1026
Store.of(self).remove(self)
1028
class TestCasePart(Storm):
1029
"""An actual piece of code to test an exercise solution."""
1031
__storm_table__ = "test_case_part"
1032
__storm_primary__ = "partid"
1037
part_type = Unicode()
1038
test_type = Unicode()
1040
filename = Unicode()
1042
test = Reference(testid, "TestCase.testid")
1044
__init__ = _kwarg_init
1047
Store.of(self).remove(self)