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fix(realtime): send the access token on every join and push it on every session change - #2037
The first channel join had no access token, because the token was only stored after the first set_auth() from the heartbeat.
A new session token reached the joined channels only through the heartbeat loop, up to a full heartbeat interval later.
A token that changed while a join was pending was never sent to that channel. The channel was not joined yet when the token was pushed, and was marked up to date afterwards.
Now every join carries the current token. On every session change, including INITIAL_SESSION, AsyncClient sends the token to the joined channels right away.
Builds on #2034, which made AsyncClient.realtime one cached RealtimeClient.
Changes
realtime
RealtimeChannel.subscribe() awaits the token callback after connecting. The join then carries the current token, and channels that are already joined get it too.
A token passed as set_auth(token) is kept: the callback no longer replaces it on joins, heartbeats and reconnects, until set_auth() is called without a token. Before, the heartbeat replaced it with the callback token within one interval, and with the callback now awaited on every join, a channel joined after set_auth(user_jwt) would have used the callback token instead. supabase-js behaves the same way, with its manually set token.
The heartbeat no longer logs "no token callback was registered" on every beat for a client without a callback.
After a join completes, the channel is sent the client's token if it changed during the join. If that send fails, the failure is logged and subscribe() still returns the join reply, since the server has already joined the channel. The lost connection surfaces to the readers of the channel. If subscribe() is cancelled during that send, the channel is closed and left like a cancelled join.
set_auth() sends tokens in the order of the calls. A lock covers both the token callback and the sends, so concurrent calls and the heartbeat cannot leave a channel on an older token.
set_auth() without a token, when the callback returns none, now keeps the current token and no longer logs "no token callback was registered". The docstring describes what None does.
supabase
AsyncClient._set_access_token starts a task that calls realtime.set_auth(), but only when realtime was already created, so an auth event never creates the realtime client. set_auth() reads the current token through the callback, so a task that runs late never sends a token that a later auth event replaced. The tasks are kept in a set until they finish, a failure is logged as a warning, and aclose() cancels the ones still pending. The next heartbeat sends the token again, since last_token is only updated after a successful send.
Docs and matrix
The realtime and supabase READMEs say when the token is sent.
client.authentication_integration.cross_client_token_sync is now implemented, verified through the SupabaseClient.with_token symbol already registered there. Third-party auth is still not_implemented, so Supabase Auth is the only source of the token.
The note on realtime.configuration.access_token_callback says that the callback is also awaited on every join.
Tests
New src/realtime/tests/test_access_token.py: the first join and every later join carry the current token, set_auth() sends to joined channels right away, a token set during a pending join is sent once the join completes, a failed send after the join is logged without failing the subscribe, a subscribe cancelled during that send leaves the channel, a token passed to set_auth() is kept on joins and heartbeats until set_auth() is called without one, concurrent set_auth() calls are applied in order, and a callback that returns no token keeps the current one.
src/supabase/tests/_async/test_client.py: every session event and SIGNED_OUT send the token to realtime right away, auth events do not create the realtime client, a failed send is logged, and aclose() cancels a pending token update.
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Summary
Summary by CodeRabbit
New Features
Realtime channels now receive the current access token when they join and are updated when authentication changes, including sign-in, session refresh, and sign-out.
Token updates are handled in order, including changes that occur while a channel is joining. Failed channel updates are logged without interrupting the update process.
Documentation
Updated realtime guidance to describe token handling during channel joins and authentication changes.
Realtime token callbacks now run for channel joins, and successful joins check for a newer stored token. RealtimeClient serializes token updates and sends changed tokens to joined channels. AsyncClient schedules realtime token updates after access-token changes when realtime is initialized, tracks those tasks, and cancels pending tasks during shutdown. Tests cover token propagation, pending joins, concurrent updates, auth events, failures, and shutdown.
supabase/supabase-py#1940: Changes when AsyncRealtimeChannel.subscribe() settles; this PR sends an updated token after a pending join completes.
supabase/supabase-py#2034: Changes RealtimeClient connection ownership and channel-join behavior used by this PR’s token propagation.
Change: Bug fix
Merge Risk: Low · up to 3be17
Realtime now sends the current token on every join and on session changes. In a rare case, a joined channel could keep an outdated token if the token changed during a pending join and the post-join send failed. This is bounded and unlikely, but worth a retry or follow-up.
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Actionable comments posted: 2
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Inline comments:
Review comments at @src/realtime/src/realtime/channel.py:
- Line 273: Make the token catch-up in subscribe() cancellation-safe: if waiting
for the auth lock or sending the token is cancelled, clean up the join so the
channel is not left JOINED or registered, then propagate cancellation. Guard
cleanup against the current subscribe attempt so it cannot alter a newer
attempt; preserve the existing behavior when _send_token_if_changed completes.
Review comments at @src/realtime/src/realtime/client.py:
- Line 432: Update the post-join token handling in subscribe() so a failed send
remains pending and is retried even when the auth callback returns the same
token, or propagate the failure and clean up the subscription instead of
reporting success. Preserve set_auth()’s pending-token behavior until the
channel receives the update.
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src/realtime/README.md
src/realtime/src/realtime/channel.py
src/realtime/src/realtime/client.py
src/realtime/tests/test_access_token.py
src/supabase/README.md
src/supabase/src/supabase/client.py
src/supabase/tests/_async/test_client.py
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…2038)
## What
Realtime was handed a copy of the access token that the client keeps in
its `Authorization` header. That copy is only as fresh as the last auth
event, so after a missed auto refresh, for example when the process was
suspended or `auto_refresh_token` is off, realtime connected and joined
with an expired token until the next `TOKEN_REFRESHED` event.
`AsyncClient` now pulls the token from Auth on demand, the way
supabase-js, supabase-swift and supabase-flutter do: the callback it
gives realtime reads the session through `auth.get_session()`, which
refreshes an expiring session first. Realtime awaits that callback when
it connects, on every channel join and on every heartbeat.
Builds on #2037, which made realtime await the callback on every join
and push the token on every session change.
## Changes
### `supabase`
- `AsyncClient._realtime_access_token` returns the access token of
`auth.get_session()`. Without a session, or on a `with_token()` client
that has no auth, it returns the `Authorization` token of the client,
the API key by default, as before.
- A refresh that fails raises from `subscribe()`, so a channel is never
joined with a token that is known to be stale.
### `realtime`
- The heartbeat loop now logs a token callback that raises and keeps the
connection and the current token, instead of dying silently. Before, an
exception from the callback ended the heartbeat task, and the server
dropped the socket once the heartbeats stopped. A closed connection
still fails the connection as before. The log names only the type of the
error, since its message can contain a credential. The supabase client
logs a failed token push to realtime the same way.
### Docs and matrix
- The realtime README and the `token_callback` docstring say what
happens when the callback raises.
- The supabase README and the notes of
`client.authentication_integration.cross_client_token_sync` and
`realtime.configuration.access_token_callback` describe where the token
comes from.
## Out of scope
- A third-party `access_token` callback on the top-level client is
SDK-111. The pull callback is the hook it will plug into.
- The realtime client still uses the same token for the `apikey` query
parameter of the socket URL and for the channel joins. supabase-js sends
the API key in the URL and the user token in the joins. That split is a
separate change.
## Tests
- `src/supabase/tests/_async/test_client.py`: the realtime callback
returns the token of `auth.get_session()` rather than the header, falls
back to the `Authorization` token without a session, and lets a failed
refresh raise.
- `src/realtime/tests/test_access_token.py`: a callback that raises
fails `subscribe()` without a join, and a callback that starts raising
after the connect keeps the heartbeat running and is logged.
Closes SDK-1785
Closes#1210
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What
Realtime could run with an outdated token:
set_auth()from the heartbeat.Now every join carries the current token. On every session change, including
INITIAL_SESSION,AsyncClientsends the token to the joined channels right away.Builds on #2034, which made
AsyncClient.realtimeone cachedRealtimeClient.Changes
realtimeRealtimeChannel.subscribe()awaits the token callback after connecting. The join then carries the current token, and channels that are already joined get it too.set_auth(token)is kept: the callback no longer replaces it on joins, heartbeats and reconnects, untilset_auth()is called without a token. Before, the heartbeat replaced it with the callback token within one interval, and with the callback now awaited on every join, a channel joined afterset_auth(user_jwt)would have used the callback token instead. supabase-js behaves the same way, with its manually set token.subscribe()still returns the join reply, since the server has already joined the channel. The lost connection surfaces to the readers of the channel. Ifsubscribe()is cancelled during that send, the channel is closed and left like a cancelled join.set_auth()sends tokens in the order of the calls. A lock covers both the token callback and the sends, so concurrent calls and the heartbeat cannot leave a channel on an older token.set_auth()without a token, when the callback returns none, now keeps the current token and no longer logs "no token callback was registered". The docstring describes whatNonedoes.supabaseAsyncClient._set_access_tokenstarts a task that callsrealtime.set_auth(), but only whenrealtimewas already created, so an auth event never creates the realtime client.set_auth()reads the current token through the callback, so a task that runs late never sends a token that a later auth event replaced. The tasks are kept in a set until they finish, a failure is logged as a warning, andaclose()cancels the ones still pending. The next heartbeat sends the token again, sincelast_tokenis only updated after a successful send.Docs and matrix
client.authentication_integration.cross_client_token_syncis nowimplemented, verified through theSupabaseClient.with_tokensymbol already registered there. Third-party auth is stillnot_implemented, so Supabase Auth is the only source of the token.realtime.configuration.access_token_callbacksays that the callback is also awaited on every join.Tests
src/realtime/tests/test_access_token.py: the first join and every later join carry the current token,set_auth()sends to joined channels right away, a token set during a pending join is sent once the join completes, a failed send after the join is logged without failing the subscribe, a subscribe cancelled during that send leaves the channel, a token passed toset_auth()is kept on joins and heartbeats untilset_auth()is called without one, concurrentset_auth()calls are applied in order, and a callback that returns no token keeps the current one.src/supabase/tests/_async/test_client.py: every session event andSIGNED_OUTsend the token to realtime right away, auth events do not create the realtime client, a failed send is logged, andaclose()cancels a pending token update.Closes SDK-2748
Supersedes SDK-1323