Adds publisher for RabbitMQ

lib/outboxable/rabbitmq/publisher.rb

@@ -0,0 +1,37 @@
+module Outboxable
+  module RabbitMq
+    class Publisher
+      def initialize(resource:)
+        @resource = resource
+      end
+    
+      def to_envelope(resource:)
+        # throw not implemented method error
+        raise NotImplementedError, "Please implement the to_envelope method in your own module" 
+      end
+    
+      def publish
+        confirmed = nil
+    
+        Outboxable::Connection.instance.channel.with do |channel|
+          channel.confirm_select
+    
+          # Declare a exchange
+          exchange = channel.topic(@resource.exchange, durable: true)
+    
+          # Publish the CloudEvent resource to the exchange
+          exchange.publish(to_envelope(resource: @resource), routing_key: @resource.routing_key, headers: @resource.try(:headers) || {})
+    
+          # Wait for confirmation
+          confirmed = channel.wait_for_confirms
+        end
+    
+        return unless confirmed
+    
+        @resource.reload
+        @resource.increment_attempt
+        @resource.update(status: :published, retry_at: nil)
+      end
+    end
+  end
+end