instance method `stream_from`

Ruby on Rails 6.1.7.10

Since v5.2.8.1

Available in: v5.2.8.1 v6.0.6 v6.1.7.10 v7.0.10 v7.1.6 v7.2.3 v8.0.4 v8.1.2

Compare with:

stream_from(broadcasting, callback = nil, coder: nil, &block)

Start streaming from the named broadcasting pubsub queue. Optionally, you can pass a callback that’ll be used instead of the default of just transmitting the updates straight to the subscriber. Pass coder: ActiveSupport::JSON to decode messages as JSON before passing to the callback. Defaults to coder: nil which does no decoding, passes raw messages.

Parameters

broadcasting req
callback opt = nil
coder key = nil
block block

Source

# File actioncable/lib/action_cable/channel/streams.rb, line 76
      def stream_from(broadcasting, callback = nil, coder: nil, &block)
        broadcasting = String(broadcasting)

        # Don't send the confirmation until pubsub#subscribe is successful
        defer_subscription_confirmation!

        # Build a stream handler by wrapping the user-provided callback with
        # a decoder or defaulting to a JSON-decoding retransmitter.
        handler = worker_pool_stream_handler(broadcasting, callback || block, coder: coder)
        streams[broadcasting] = handler

        connection.server.event_loop.post do
          pubsub.subscribe(broadcasting, handler, lambda do
            ensure_confirmation_sent
            logger.info "#{self.class.name} is streaming from #{broadcasting}"
          end)
        end
      end

Defined in actioncable/lib/action_cable/channel/streams.rb line 76 · View on GitHub · Improve this page · Find usages on GitHub

Defined in ActionCable::Channel::Streams

Signature

Parameters