39 lines
871 B
Python
39 lines
871 B
Python
import random
|
|
import threading
|
|
|
|
csprng = random.SystemRandom()
|
|
|
|
sessions_lock = threading.Lock()
|
|
max_sessions = 1024
|
|
sessions = {}
|
|
|
|
def new_session(userid):
|
|
"""Creates a new session and returns its ID"""
|
|
with sessions_lock:
|
|
while True:
|
|
sessionid = csprng.randrange(2 << 256)
|
|
|
|
# Check that the ID is unique
|
|
if sessionid not in sessions:
|
|
break
|
|
|
|
# Do we have too many sessions?
|
|
# TODO: Implement the limit per-user
|
|
if len(sessions) >= max_sessions:
|
|
# Yes, drop a random one
|
|
# TODO: Have some LRU thing here
|
|
delete_id = random.choice(list(sessions.keys()))
|
|
del sessions[delete_id]
|
|
|
|
sessions[sessionid] = userid
|
|
|
|
return sessionid
|
|
|
|
def get_userid(sessionid):
|
|
"""Returns the user associated with session ID
|
|
Returns None if no user was found"""
|
|
with sessions_lock:
|
|
if sessionid in sessions:
|
|
return sessions[sessionid]
|
|
|
|
return None
|