|
|
from django.shortcuts import render
|
|
|
from django.http import Http404
|
|
|
import redis
|
|
|
import uuid
|
|
|
from redis_app.utils.index import create_index
|
|
|
# This model only helps us the development part to set rules on objects (we do not use the django model to save objects in it)
|
|
|
from .models import Person
|
|
|
|
|
|
DEFAULT_EXPIRE_TIME = 1200
|
|
|
EXPIRE_REFRESH_TIME = 60
|
|
|
|
|
|
messages = [] # All messages obtained with pub/sub. Will refresh the view every time a message is received
|
|
|
redis_connection = redis.Redis(host='localhost', port=6379, decode_responses=True)
|
|
|
pub_sub = redis_connection.pubsub()
|
|
|
create_index(redis_connection=redis_connection)
|
|
|
|
|
|
def get_uuid4():
|
|
|
return str(uuid.uuid4()).replace('-', '')
|
|
|
|
|
|
def getCoursesFromPerson(person_id):
|
|
|
global redis_connection
|
|
|
course_keys = redis_connection.keys(f"course:*")
|
|
|
courses = []
|
|
|
person = redis_connection.hgetall(f"person:{person_id}")
|
|
|
for key in course_keys:
|
|
|
course_data = redis_connection.hgetall(key)
|
|
|
if person['role'] == "Student":
|
|
|
if person_id in course_data.get('students', '').split(","):
|
|
|
course_id = getCourseId2(course_data['title'], course_data['teacher'])
|
|
|
if course_id == False:
|
|
|
continue
|
|
|
course_data['id'] = course_id.split(":")[1]
|
|
|
courses.append(course_data)
|
|
|
else:
|
|
|
teacher_id = course_data["teacher"]
|
|
|
if teacher_id == person_id:
|
|
|
course_id = getCourseId2(course_data['title'], course_data['teacher'])
|
|
|
if course_id == False:
|
|
|
continue
|
|
|
course_data['id'] = course_id.split(":")[1]
|
|
|
courses.append(course_data)
|
|
|
return courses
|
|
|
|
|
|
def isExpired(course_id):
|
|
|
global redis_connection
|
|
|
ttl = redis_connection.ttl(f"course:{course_id}")
|
|
|
if ttl == -2 or ttl == 0: # If -1, the key has no expiration
|
|
|
return True
|
|
|
return False
|
|
|
|
|
|
def isCourseFull(course):
|
|
|
students = course.get('students', '') # Because it crashes with ['students'], we have to put a default value: '' here
|
|
|
if not students:
|
|
|
return False
|
|
|
|
|
|
try:
|
|
|
places = int(course['places'])
|
|
|
if len(students.split(',')) >= places:
|
|
|
return True
|
|
|
return False
|
|
|
except:
|
|
|
return False
|
|
|
|
|
|
def getPersonId(person_name, person_role):
|
|
|
query = f"@name:{person_name} @role:{person_role}"
|
|
|
results = redis_connection.execute_command('FT.SEARCH', 'idx:persons', query)
|
|
|
if results[0] > 0:
|
|
|
person_key = results[1]
|
|
|
return person_key
|
|
|
return False
|
|
|
|
|
|
def getCourseId2(course_title, course_teacher):
|
|
|
query = f"@title:{course_title} @teacher:{course_teacher}"
|
|
|
results = redis_connection.execute_command('FT.SEARCH', 'idx:courses', query)
|
|
|
if results[0] > 0:
|
|
|
course_key = results[1]
|
|
|
return course_key
|
|
|
return False
|
|
|
|
|
|
def getCourseId(course):
|
|
|
return getCourseId2(course['title'], course['teacher'])
|
|
|
|
|
|
|
|
|
|
|
|
def home(request):
|
|
|
person = request.session.get("person", "")
|
|
|
return render(request, 'home.html', {'person': person})
|
|
|
|
|
|
def isPersonRegisteredToCourse(course, person):
|
|
|
global redis_connection
|
|
|
if not person:
|
|
|
return False
|
|
|
|
|
|
person_id = getPersonId(person["name"], person["role"]).split(":")[1]
|
|
|
if not person_id:
|
|
|
return False
|
|
|
|
|
|
course_id = getCourseId(course)
|
|
|
if not course_id:
|
|
|
return False
|
|
|
|
|
|
course_keys = redis_connection.keys(f"course:*")
|
|
|
for key in course_keys:
|
|
|
course_data = redis_connection.hgetall(key)
|
|
|
if person['role'] == "Student":
|
|
|
if person_id in course_data.get('students', '').split(","):
|
|
|
current_course_id = getCourseId2(course_data['title'], course_data['teacher'])
|
|
|
if current_course_id == False:
|
|
|
continue
|
|
|
if course_id == current_course_id:
|
|
|
return True
|
|
|
return False
|
|
|
|
|
|
def details(request, course_id, error_message=''):
|
|
|
person = request.session.get("person", "")
|
|
|
global redis_connection
|
|
|
if isExpired(course_id):
|
|
|
raise Http404("Course has expired... Get faster next time!")
|
|
|
course = redis_connection.hgetall(f"course:{course_id}")
|
|
|
if not course:
|
|
|
raise Http404("Course does not exist")
|
|
|
course['id'] = course_id
|
|
|
teacher = redis_connection.hgetall(f"person:{course['teacher']}")
|
|
|
if not teacher:
|
|
|
raise Http404("Teacher does not exist")
|
|
|
course['teacher_name'] = teacher['name']
|
|
|
register = isPersonRegisteredToCourse(course, person)
|
|
|
full = isCourseFull(course)
|
|
|
return render(request, 'details.html', {'course': course, 'person': person, 'register': register, 'full': full, 'error_message': error_message})
|
|
|
|
|
|
def register(request):
|
|
|
if request.method == 'POST':
|
|
|
person_name = request.POST['name']
|
|
|
person_role = request.POST['role']
|
|
|
query = f"@name:{person_name} @role:{person_role}"
|
|
|
results = redis_connection.execute_command('FT.SEARCH', 'idx:persons', query)
|
|
|
# First element = number of results
|
|
|
if results[0] > 0:
|
|
|
return render(request, 'register.html', {'person': Person(name="", role=""), "error_message": "This user already exists!"})
|
|
|
person_key = f"person:{get_uuid4()}"
|
|
|
redis_connection.hset(person_key, mapping={
|
|
|
'name': person_name,
|
|
|
'role': person_role
|
|
|
})
|
|
|
|
|
|
|
|
|
request.session["person"] = redis_connection.hgetall(person_key)
|
|
|
return home(request)
|
|
|
|
|
|
return render(request, 'register.html', {'person': Person(name="", role=""), "error_message": "The form has been wrongly filled!"})
|
|
|
|
|
|
def login(request):
|
|
|
if request.method == 'POST':
|
|
|
person_name = request.POST['name']
|
|
|
person_role = request.POST['role']
|
|
|
|
|
|
query = f"@name:{person_name} @role:{person_role}"
|
|
|
results = redis_connection.execute_command('FT.SEARCH', 'idx:persons', query)
|
|
|
if results[0] > 0:
|
|
|
person_key = results[1]
|
|
|
request.session["person"] = redis_connection.hgetall(person_key)
|
|
|
return home(request)
|
|
|
return render(request, 'login.html', {'person': Person(name="", role=""), "error_message": "No user found!"})
|
|
|
|
|
|
return login_form(request)
|
|
|
|
|
|
def register_form(request):
|
|
|
return render(request, 'register.html', {'person': Person(name="", role="")})
|
|
|
|
|
|
def login_form(request):
|
|
|
return render(request, 'login.html', {'person': Person(name="", role="")})
|
|
|
|
|
|
def logout(request):
|
|
|
request.session["person"] = ""
|
|
|
return render(request, 'login.html', {'person': Person(name="", role="")})
|
|
|
|
|
|
def courses(request):
|
|
|
person = request.session.get("person", "")
|
|
|
if person == "":
|
|
|
return render(request, 'login.html', {'person': Person(name="", role=""), "error_message": "You must login!"})
|
|
|
person_id = getPersonId(person["name"], person["role"]).split(":")[1]
|
|
|
|
|
|
courses = getCoursesFromPerson(person_id)
|
|
|
return render(request, 'courses.html', {'person': person, 'courses': courses})
|
|
|
|
|
|
def change_profile(request):
|
|
|
person = request.session.get("person", "")
|
|
|
if person == '':
|
|
|
return render(request, 'login.html', {'person': Person(name="", role=""), "error_message": "You must login!"})
|
|
|
|
|
|
if request.method == 'POST':
|
|
|
person_name = request.POST['name']
|
|
|
person_role = request.POST['role']
|
|
|
|
|
|
person_id = getPersonId(person["name"], person["role"])
|
|
|
if not person_id:
|
|
|
return render(request, 'profile.html', {'person': person, "error_message": "Internal error: No user found!"})
|
|
|
redis_connection.hmset(person_id, mapping={"name": person_name, "role": person_role})
|
|
|
|
|
|
person["name"] = person_name
|
|
|
person["role"] = person_role
|
|
|
request.session["person"] = person
|
|
|
return render(request, 'profile.html', {'person': person})
|
|
|
|
|
|
return login_form(request)
|
|
|
|
|
|
def profile(request):
|
|
|
person = request.session.get("person", "")
|
|
|
if person == '':
|
|
|
return render(request, 'login.html', {'person': Person(name="", role=""), "error_message": "You must login!"})
|
|
|
return render(request, 'profile.html', {'person': person})
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
def delete_course(course_id):
|
|
|
course = redis_connection.hgetall(f"course:{course_id}")
|
|
|
if not course:
|
|
|
return False
|
|
|
redis_connection.delete(f"course:{course_id}")
|
|
|
return True
|
|
|
|
|
|
def delete_course_view(request, course_id):
|
|
|
if isExpired(course_id):
|
|
|
raise Http404("Course has expired... Get faster next time!")
|
|
|
res = delete_course(course_id)
|
|
|
if not res:
|
|
|
return courses(request)
|
|
|
publish(course_id, f"DELETE: Course:{course_id} has been deleted!")
|
|
|
return courses(request)
|
|
|
|
|
|
def create_course(course_title, course_summary, course_level, course_places, course_teacher):
|
|
|
course_id = get_uuid4()
|
|
|
redis_connection.hset(f"course:{course_id}", mapping={
|
|
|
"title": course_title,
|
|
|
"summary": course_summary,
|
|
|
"level": course_level,
|
|
|
"places": course_places,
|
|
|
"teacher": course_teacher
|
|
|
})
|
|
|
redis_connection.expire(f"course:{course_id}", DEFAULT_EXPIRE_TIME)
|
|
|
|
|
|
def update_course(course_id, course_title, course_summary, course_level, course_places, course_teacher):
|
|
|
redis_connection.hset(f"course:{course_id}", mapping={
|
|
|
"title": course_title,
|
|
|
"summary": course_summary,
|
|
|
"level": course_level,
|
|
|
"places": course_places,
|
|
|
"teacher": course_teacher
|
|
|
})
|
|
|
redis_connection.expire(f"course:{course_id}", DEFAULT_EXPIRE_TIME)
|
|
|
publish(course_id, f"UPDATE: Course:{course_id} is now: Title: {course_title}, Summary: {course_summary}, Level: {course_level}, Places: {course_places}, Teacher: {course_teacher}")
|
|
|
|
|
|
def publish_message(request):
|
|
|
person = request.session.get("person", "")
|
|
|
courses_fetched = getCoursesFromPerson(getPersonId(person['name'], person['role']).split(":")[1])
|
|
|
for course in courses_fetched:
|
|
|
course['id'] = getCourseId(course).split(':')[1]
|
|
|
if not courses_fetched:
|
|
|
return courses(request)
|
|
|
return render(request, 'publish_message.html', {'person': person, 'courses': courses_fetched})
|
|
|
|
|
|
def publish_message_form(request):
|
|
|
person = request.session.get("person", "")
|
|
|
global redis_connection
|
|
|
if person == '':
|
|
|
return render(request, 'login.html', {'person': Person(name="", role=""), "error_message": "You must login!"})
|
|
|
if person['role'] == 'Student':
|
|
|
return render(request, 'publish_message.html', {'person': person, "error_message": "The form has been wrongly filled!"})
|
|
|
if request.method == 'POST':
|
|
|
course_id = request.POST['course_id']
|
|
|
message = request.POST['message']
|
|
|
course = redis_connection.hgetall(f'course:{course_id}')
|
|
|
if not course:
|
|
|
raise Http404("Course not found")
|
|
|
publish(course_id, message)
|
|
|
return publish_message(request)
|
|
|
|
|
|
return render(request, 'publish_message.html', {'person': person, "error_message": "The form has been wrongly filled!"})
|
|
|
|
|
|
def create_course_view(request):
|
|
|
person = request.session.get("person", "")
|
|
|
return render(request, 'create.html', {'person': person})
|
|
|
|
|
|
def update_course_view(request, course_id):
|
|
|
person = request.session.get("person", "")
|
|
|
if isExpired(course_id):
|
|
|
raise Http404("Course has expired... Get faster next time!")
|
|
|
course = redis_connection.hgetall(f"course:{course_id}")
|
|
|
if not course:
|
|
|
raise Http404("Course does not exist")
|
|
|
course_id = getCourseId2(course['title'], course['teacher'])
|
|
|
if course_id == False:
|
|
|
raise Http404("Course does not exist")
|
|
|
course['id'] = course_id.split(":")[1]
|
|
|
return render(request, 'update.html', {'person': person, 'course': course})
|
|
|
|
|
|
def create_course_form(request):
|
|
|
person = request.session.get("person", "")
|
|
|
global redis_connection
|
|
|
if person == '':
|
|
|
return render(request, 'login.html', {'person': Person(name="", role=""), "error_message": "You must login!"})
|
|
|
if request.method == 'POST':
|
|
|
course_title = request.POST['title']
|
|
|
course_summary = request.POST['summary']
|
|
|
course_level = request.POST['level']
|
|
|
course_places = request.POST['places']
|
|
|
course_teacher = getPersonId(person['name'], person['role']).split(":")[1]
|
|
|
create_course(course_title, course_summary, course_level, course_places, course_teacher)
|
|
|
return courses(request)
|
|
|
|
|
|
return render(request, 'create.html', {'person': person, "error_message": "The form has been wrongly filled!"})
|
|
|
|
|
|
def update_course_form(request, course_id):
|
|
|
person = request.session.get("person", "")
|
|
|
global redis_connection
|
|
|
if isExpired(course_id):
|
|
|
raise Http404("Course has expired... Get faster next time!")
|
|
|
if person == '':
|
|
|
return render(request, 'login.html', {'person': Person(name="", role=""), "error_message": "You must login!"})
|
|
|
if request.method == 'POST':
|
|
|
course_title = request.POST['title']
|
|
|
course_summary = request.POST['summary']
|
|
|
course_level = request.POST['level']
|
|
|
course_places = request.POST['places']
|
|
|
course_teacher = getPersonId(person['name'], person['role']).split(":")[1]
|
|
|
course = redis_connection.hgetall(f"course:{course_id}")
|
|
|
course["id"] = course_id
|
|
|
course_students = course.get("students", "")
|
|
|
try:
|
|
|
if course_students and len(course_students.split(',')) >= int(course_places):
|
|
|
return render(request, 'update.html', {'person': person, "error_message": "There's too many students registered to decrease the number of places that much!", "course": course})
|
|
|
except:
|
|
|
return render(request, 'update.html', {'person': person, "error_message": "The number of places has not the right format!", "course": course})
|
|
|
update_course(course_id, course_title, course_summary, course_level, course_places, course_teacher)
|
|
|
return courses(request)
|
|
|
|
|
|
return render(request, 'update.html', {'person': person, "error_message": "The form has been wrongly filled!", "course": course})
|
|
|
|
|
|
# Test if places are not limited
|
|
|
def course_register(course_id, person_id):
|
|
|
course = redis_connection.hgetall(f"course:{course_id}")
|
|
|
person = redis_connection.hgetall(f"person:{person_id}")
|
|
|
if not course or not person:
|
|
|
return False
|
|
|
|
|
|
students = course.get('students', '')
|
|
|
if person_id in students.split(','):
|
|
|
return True
|
|
|
|
|
|
try:
|
|
|
places = int(course['places'])
|
|
|
if students != '':
|
|
|
students_nb = len(students.split(','))
|
|
|
if students_nb and students_nb >= places:
|
|
|
return False
|
|
|
except:
|
|
|
return False
|
|
|
|
|
|
if not students:
|
|
|
new_students = person_id
|
|
|
else:
|
|
|
new_students = students + "," + person_id
|
|
|
|
|
|
redis_connection.hset(f"course:{course_id}", "students", new_students)
|
|
|
return True
|
|
|
|
|
|
def course_unregister(course_id, person_id):
|
|
|
course = redis_connection.hgetall(f"course:{course_id}")
|
|
|
person = redis_connection.hgetall(f"person:{person_id}")
|
|
|
if not course or not person:
|
|
|
return False
|
|
|
|
|
|
students = course.get('students', '')
|
|
|
if person_id not in students.split(','):
|
|
|
return True
|
|
|
|
|
|
students_list = students.split(",")
|
|
|
if len(students_list) == 1:
|
|
|
new_students = ""
|
|
|
else:
|
|
|
new_students = ",".join([student for student in students_list if student != person_id])
|
|
|
|
|
|
redis_connection.hset(f"course:{course_id}", "students", new_students)
|
|
|
return True
|
|
|
|
|
|
def course_register_view(request, course_id):
|
|
|
person = request.session.get("person", "")
|
|
|
global redis_connection
|
|
|
if isExpired(course_id):
|
|
|
raise Http404("Course has expired... Get faster next time!")
|
|
|
person_id = getPersonId(person["name"], person["role"]).split(":")[1]
|
|
|
if not person_id:
|
|
|
raise Http404("Person not found")
|
|
|
course = redis_connection.hgetall(f"course:{course_id}")
|
|
|
if not course:
|
|
|
raise Http404("Course not found")
|
|
|
course["id"] = course_id
|
|
|
teacher = redis_connection.hgetall(f"person:{course['teacher']}")
|
|
|
if not teacher:
|
|
|
raise Http404("Teacher does not exist")
|
|
|
course['teacher_name'] = teacher['name']
|
|
|
if course_register(course_id, person_id):
|
|
|
return details(request, course_id)
|
|
|
return details(request, course_id, "Could not register to the course. Try again later.")
|
|
|
|
|
|
def course_unregister_view(request, course_id):
|
|
|
person = request.session.get("person", "")
|
|
|
global redis_connection
|
|
|
if personLoggedIn == "":
|
|
|
return render(request, 'login.html', {'person': Person(name="", role=""), "error_message": "You must login!"})
|
|
|
if isExpired(course_id):
|
|
|
raise Http404("Course has expired... Get faster next time!")
|
|
|
person_id = getPersonId(person["name"], person["role"]).split(":")[1]
|
|
|
if not person_id:
|
|
|
raise Http404("Person not found")
|
|
|
course = redis_connection.hgetall(f"course:{course_id}")
|
|
|
if not course:
|
|
|
raise Http404("Course not found")
|
|
|
course["id"] = course_id
|
|
|
teacher = redis_connection.hgetall(f"person:{course['teacher']}")
|
|
|
if not teacher:
|
|
|
raise Http404("Teacher does not exist")
|
|
|
course['teacher_name'] = teacher['name']
|
|
|
if course_unregister(course_id, person_id):
|
|
|
return details(request, course_id)
|
|
|
return details(request, course_id, "Could not unregister to the course. Try again later.")
|
|
|
|
|
|
def refresh_expire(course_id):
|
|
|
course = redis_connection.hgetall(f"course:{course_id}")
|
|
|
if not course:
|
|
|
return False
|
|
|
ttl = redis_connection.ttl(f"course:{course_id}")
|
|
|
if ttl <= 0:
|
|
|
return False
|
|
|
redis_connection.expire(f"course:{course_id}", ttl + EXPIRE_REFRESH_TIME)
|
|
|
return True
|
|
|
|
|
|
def publish(course_id, message):
|
|
|
global redis_connection
|
|
|
redis_connection.publish(course_id, message)
|
|
|
|
|
|
# Courses is a list of course id to subscribe to
|
|
|
def subscribe(courses_id):
|
|
|
pub_sub.psubscribe(*courses_id)
|
|
|
|
|
|
for message in pub_sub.listen():
|
|
|
if message["type"] != 'pmessage':
|
|
|
continue
|
|
|
send_new_course_notification(message)
|
|
|
|
|
|
def send_new_course_notification(message):
|
|
|
print(message)
|
|
|
|
|
|
def search(keywords):
|
|
|
courses = []
|
|
|
for keyword in keywords.split(' '):
|
|
|
if not keyword: # When the users end his keywords with a ' '
|
|
|
continue
|
|
|
title_query = f"@title:{keyword}"
|
|
|
summary_query = f"@summary:{keyword}"
|
|
|
level_query = f"@level:{keyword}"
|
|
|
teacher_query = f"@teacher:{keyword}"
|
|
|
title_results = redis_connection.execute_command('FT.SEARCH', 'idx:courses', title_query)
|
|
|
summary_results = redis_connection.execute_command('FT.SEARCH', 'idx:courses', summary_query)
|
|
|
level_results = redis_connection.execute_command('FT.SEARCH', 'idx:courses', level_query)
|
|
|
teacher_results = redis_connection.execute_command('FT.SEARCH', 'idx:courses', teacher_query)
|
|
|
for i in range(1, len(title_results), 2):
|
|
|
courses.append(title_results[i])
|
|
|
for i in range(1, len(summary_results), 2):
|
|
|
courses.append(summary_results[i])
|
|
|
for i in range(1, len(level_results), 2):
|
|
|
courses.append(level_results[i])
|
|
|
for i in range(1, len(teacher_results), 2):
|
|
|
courses.append(teacher_results[i])
|
|
|
return courses
|
|
|
|
|
|
def search_view(request):
|
|
|
person = request.session.get("person", "")
|
|
|
return render(request, 'search.html', {'person': person})
|
|
|
|
|
|
def search_form(request):
|
|
|
person = request.session.get("person", "")
|
|
|
global redis_connection
|
|
|
if request.method == 'POST':
|
|
|
keywords = request.POST['keywords']
|
|
|
courses = []
|
|
|
courses_id = search(keywords)
|
|
|
for course_id in courses_id:
|
|
|
course = redis_connection.hgetall(course_id)
|
|
|
if not course:
|
|
|
continue
|
|
|
course['id'] = course_id.split(":")[1]
|
|
|
courses.append(course)
|
|
|
return render(request, 'search.html', {'person': person, 'courses': courses})
|
|
|
|
|
|
return render(request, 'search.html', {'person': person, "error_message": "The form has been wrongly filled!"})
|
|
|
|
|
|
def notifications_view(request):
|
|
|
person = request.session.get("person", "")
|
|
|
global messages
|
|
|
return render(request, 'notifications.html', {'person': person, 'messages': messages})
|
|
|
|
|
|
def notifications(request):
|
|
|
person = request.session.get("person", "")
|
|
|
global messages
|
|
|
if person == "":
|
|
|
return render(request, 'login.html', {'person': Person(name="", role=""), "error_message": "You must login!"})
|
|
|
pub_sub.punsubscribe()
|
|
|
courses_id = [course['id'] for course in getCoursesFromPerson(getPersonId(person['name'], person['role']).split(":")[1])]
|
|
|
if not courses_id:
|
|
|
return courses(request)
|
|
|
pub_sub.psubscribe(*courses_id)
|
|
|
|
|
|
for message in pub_sub.listen():
|
|
|
if message["type"] != 'pmessage':
|
|
|
continue
|
|
|
messages.append(message)
|
|
|
return notifications_view(request)
|
|
|
|
|
|
def clear_notifications(request):
|
|
|
global messages
|
|
|
messages = []
|
|
|
return notifications_view(request)
|
|
|
|
|
|
# Every id is only the number, not the course:number or person:number |
