app.py
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import logging
from os import path
import sqlite3
import bcrypt
import test
import database
# ============================================================================
# Application
# ============================================================================
class App(object):
def __init__(self, filename, conf):
# online = {
# uid1: {
# 'student': {'number': 123, 'name': john},
# 'test': ...
# }
# uid2: {...}
# }
logger.info('============= Running perguntations =============')
self.online = dict() # {uid: {'student':{}}}
self.allowed = set([]) # '0' is hardcoded to allowed elsewhere FIXME
self.testfactory = test.TestFactory(filename, conf=conf)
self.db = database.Database(self.testfactory['database']) # FIXME
try:
n = self.db.get_count_students()
except sqlite3.OperationalError as e:
logger.critical('Database not usable {}.'.format(self.db.db))
raise e
else:
logger.info('Database has {} students registered.'.format(n))
def exit(self):
logger.critical('----------- !!! Server terminated !!! -----------')
def login(self, uid, try_pw):
if uid not in self.allowed and uid != '0':
# not allowed
logger.warning('Student {}: not allowed to login.'.format(uid))
return False
student = self.db.get_student(uid)
if student is None:
# not found
logger.warning('Student {}: not found in database.'.format(uid))
return False
# uid found in database
name, pw = student
if pw == '':
# update password on first login
hashed_pw = bcrypt.hashpw(try_pw.encode('utf-8'), bcrypt.gensalt())
self.db.update_password(uid, hashed_pw)
logger.warning('Student {}: first login, password updated.'.format(uid))
elif bcrypt.hashpw(try_pw.encode('utf-8'), pw) != pw:
# wrong password
logger.info('Student {}: wrong password.'.format(uid))
return False
# success
self.allowed.discard(uid)
if uid in self.online:
logger.warning('Student {}: already logged in.'.format(uid))
else:
self.online[uid] = {'student': {'name': name, 'number': uid}}
logger.info('Student {}: logged in.'.format(uid))
return True
def logout(self, uid):
if uid not in self.online:
# this should never happen
logger.error('Student {}: tried to logout, but is not logged in.'.format(uid))
return False
else:
logger.info('Student {}: logged out.'.format(uid))
del self.online[uid]
return True
def generate_test(self, uid):
if uid in self.online:
logger.info('Student {}: generating new test.'.format(uid))
student_id = self.online[uid]['student']
self.online[uid]['test'] = self.testfactory.generate(student_id)
return self.online[uid]['test']
else:
logger.error('Student {}: offline, can''t generate test'.format(uid))
return None
def correct_test(self, uid, ans):
t = self.online[uid]['test']
t.update_answers(ans)
grade = t.correct()
logger.info('Student {0}: finished with {1} points.'.format(uid, grade))
if t['save_answers']:
fname = ' -- '.join((t['student']['number'], t['ref'], str(t['finish_time']))) + '.json'
fpath = path.abspath(path.join(t['answers_dir'], fname))
t.save_json(fpath)
self.db.save_test(t)
self.db.save_questions(t)
return grade
# --- helpers (getters)
def get_student_name(self, uid):
return self.online[uid]['student']['name']
def get_test(self, uid, default=None):
return self.online[uid].get('test', default)
def get_test_qtypes(self, uid):
return {q['ref']:q['type'] for q in self.online[uid]['test']['questions']}
def get_student_grades_from_all_tests(self, uid):
return self.db.get_student_grades_from_all_tests(uid)
# def get_student_grades_from_test(self, uid, testid):
# return self.db.get_student_grades_from_test(uid, testid)
# def get_online_students(self):
# # list of ('uid', 'name', 'start_time') sorted by start time
# return sorted(
# ((k, v['student']['name'], str(v.get('test', {}).get('start_time', '---'))) for k,v in self.online.items() if k != '0'),
# key=lambda k: k[2] # sort key
# )
def get_online_students(self):
# {'123': '2016-12-02 12:04:12.344243', ...}
return [(k, v['student']['name'], str(v.get('test', {}).get('start_time', '---'))) for k,v in self.online.items() if k != '0']
def get_offline_students(self):
# list of ('uid', 'name') sorted by number
return sorted((s[:2] for s in self.db.get_all_students() if s[0] not in self.online), key=lambda k: k[0])
def get_all_students(self):
# list of ('uid', 'name') sorted by number
return sorted((s[:2] for s in self.db.get_all_students() if s[0] != '0'), key=lambda k: k[0])
def get_students_state(self):
# {'123': {'name': 'John', 'start_time':'', 'grades':[10.2, 13.1], ...}}
d = {}
for s in self.db.get_all_students():
uid, name, pw = s
if uid == '0':
continue
d[uid] = {'name': name}
d[uid]['allowed'] = uid in self.allowed
d[uid]['online'] = uid in self.online
d[uid]['start_time'] = self.online.get(uid, {}).get('test', {}).get('start_time','')
d[uid]['password_defined'] = pw != ''
d[uid]['grades'] = self.db.get_student_grades_from_test(uid, self.testfactory['ref'])
return d
# def get_this_students_grades(self):
# # list of ('uid', 'name') sorted by number
# return self.db.get_students_grades(self.testfactory['ref'])
def get_allowed_students(self):
# set of 'uid' allowed to login
return self.allowed
# --- helpers (change state)
def allow_student(self, uid):
self.allowed.add(uid)
logger.info('Student {}: allowed to login.'.format(uid))
def deny_student(self, uid):
self.allowed.discard(uid)
logger.info('Student {}: denied to login'.format(uid))
def reset_password(self, uid):
self.db.reset_password(uid)
logger.info('Student {}: password reset to ""'.format(uid))
# ============================================================================
ch = logging.StreamHandler()
ch.setLevel(logging.INFO)
ch.setFormatter(logging.Formatter('%(asctime)s | %(name)-10s | %(levelname)-8s | %(message)s'))
logger = logging.getLogger(__name__)
logger.setLevel(logging.INFO)
logger.addHandler(ch)