module ActionCable module Server # Broadcasting is how other parts of your application can send messages to the channel subscribers. As explained in Channel, most of the time, these # broadcastings are streamed directly to the clients subscribed to the named broadcasting. Let's explain with a full-stack example: # # class WebNotificationsChannel < ApplicationCable::Channel # def subscribed # stream_from "web_notifications_#{current_user.id}" # end # end # # # Somewhere in your app this is called, perhaps from a NewCommentJob # ActionCable.server.broadcast \ # "web_notifications_1", { title: 'New things!', body: 'All shit fit for print' } # # # Client-side coffescript which assumes you've already requested the right to send web notifications # App.cable.subscriptions.create "WebNotificationsChannel", # received: (data) -> # new Notification data['title'], body: data['body'] module Broadcasting # Broadcast a hash directly to a named broadcasting. It'll automatically be JSON encoded. def broadcast(broadcasting, message) broadcaster_for(broadcasting).broadcast(message) end # Returns a broadcaster for a named broadcasting that can be reused. Useful when you have a object that # may need multiple spots to transmit to a specific broadcasting over and over. def broadcaster_for(broadcasting) Broadcaster.new(self, broadcasting) end # The redis instance used for broadcasting. Not intended for direct user use. def broadcasting_redis @broadcasting_redis ||= Redis.new(config.redis) end private class Broadcaster attr_reader :server, :broadcasting def initialize(server, broadcasting) @server, @broadcasting = server, broadcasting end def broadcast(message) server.logger.info "[ActionCable] Broadcasting to #{broadcasting}: #{message}" server.broadcasting_redis.publish broadcasting, message.to_json end end end end end