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from __future__ import with_statement
from rpyc import Service, async_
from rpyc.utils.server import ThreadedServer
from threading import RLock
USERS_DB = {
"foo": "bar",
"spam": "bacon",
"eggs": "viking",
}
broadcast_lock = RLock()
tokens = set()
class UserToken(object):
def __init__(self, name, callback):
self.name = name
self.stale = False
self.callback = callback
self.broadcast(f"* Hello {self.name} *")
tokens.add(self)
def exposed_say(self, message):
if self.stale:
raise ValueError("User token is stale")
self.broadcast(f"[{self.name}] {message}")
def exposed_logout(self):
if self.stale:
return
self.stale = True
self.callback = None
tokens.discard(self)
self.broadcast(f"* Goodbye {self.name} *")
def broadcast(self, text):
global tokens
stale = set()
with broadcast_lock:
for tok in tokens:
try:
tok.callback(text)
except Exception:
stale.add(tok)
tokens -= stale
class ChatService(Service):
def on_connect(self, conn):
self.token = None
def on_disconnect(self, conn):
if self.token:
self.token.exposed_logout()
def exposed_login(self, username, password, callback):
if self.token and not self.token.stale:
raise ValueError("already logged in")
if username in USERS_DB and password == USERS_DB[username]:
self.token = UserToken(username, async_(callback))
return self.token
else:
raise ValueError("wrong username or password")
if __name__ == "__main__":
t = ThreadedServer(ChatService, port=19912)
t.start()
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