Add Geo::RepositoriesChangedEventStore

app/services/geo/repositories_changed_event_store.rb

+module Geo
+  class RepositoriesChangedEventStore < EventStore
+    self.event_type = :repositories_changed_event
+
+    attr_reader :geo_node
+
+    def initialize(geo_node)
+      @geo_node = geo_node
+    end
+
+    private
+
+    def build_event
+      Geo::RepositoriesChangedEvent.new(geo_node: geo_node)
+    end
+
+    def log_error(message, error)
+      Gitlab::Geo::Logger.error(
+        class: self.class.name,
+        message: message,
+        error: error,
+        geo_node_id: geo_node.id,
+        geo_node_url: geo_node.url)
+    end
+  end
+end

spec/services/geo/repositories_changed_event_store_spec.rb

+require 'spec_helper'
+
+describe Geo::RepositoriesChangedEventStore do
+  let(:geo_node) { create(:geo_node) }
+
+  subject { described_class.new(geo_node) }
+
+  describe '#create' do
+    it 'does not create an event when not running on a primary node' do
+      allow(Gitlab::Geo).to receive(:primary?) { false }
+
+      expect { subject.create }.not_to change(Geo::RepositoriesChangedEvent, :count)
+    end
+
+    it 'creates a repositories changed event when running on a primary node' do
+      allow(Gitlab::Geo).to receive(:primary?) { true }
+
+      expect { subject.create }.to change(Geo::RepositoriesChangedEvent, :count).by(1)
+    end
+  end
+end