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rails--rails/actioncable/CHANGELOG.md
Dan Spinosa 6d7c12274e
Client ensures subscribe command is confirmed. (#41581) 
A SubscriptionGuarantor maintains a set of pending subscriptions,
resending the subscribe command unless and until the subscription
is confirmed or rejected by the server or cancelled client-side.

A race condition in the ActionCable server - where an unsubscribe
is sent, followed rapidly by a subscribe, but handled in the reverse
order - necessitates this enhancement.  Indeed, the subscriptions created
and torn down by Turbo Streams amplifies the existence of this race
condition.
2021-09-26 10:06:27 -07:00

1.9 KiB
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  • The Action Cable client now ensures successful channel subscriptions:

    • The client maintains a set of pending subscriptions until either the server confirms the subscription or the channel is torn down.
    • Rectifies the race condition where an unsubscribe is rapidly followed by a subscribe (on the same channel identifier) and the requests are handled out of order by the ActionCable server, thereby ignoring the subscribe command.

    Daniel Spinosa

Rails 7.0.0.alpha2 (September 15, 2021)

  • No changes.

Rails 7.0.0.alpha1 (September 15, 2021)

  • Compile ESM package that can be used directly in the browser as actioncable.esm.js.

    DHH

  • Move action_cable.js to actioncable.js to match naming convention used for other Rails frameworks, and use JS console to communicate the deprecation.

    DHH

  • Stop transpiling the UMD package generated as actioncable.js and drop the IE11 testing that relied on that.

    DHH

  • Truncate broadcast logging messages.

    J Smith

  • OpenSSL constants are now used for Digest computations.

    Dirkjan Bussink

  • The Action Cable client now includes safeguards to prevent a "thundering herd" of client reconnects after server connectivity loss:

    • The client will wait a random amount between 1x and 3x of the stale threshold after the server's last ping before making the first reconnection attempt.
    • Subsequent reconnection attempts now use exponential backoff instead of logarithmic backoff. To allow the delay between reconnection attempts to increase slowly at first, the default exponentiation base is < 2.
    • Random jitter is applied to each delay between reconnection attempts.

    Jonathan Hefner

Please check 6-1-stable for previous changes.