First pass at multi-database for read replica using Rails native adapter (#25693)

Co-authored-by: emilweth <7402764+emilweth@users.noreply.github.com>

app/controllers/api/v1/timelines/home_controller.rb

@@ -6,11 +6,14 @@ class Api::V1::Timelines::HomeController < Api::BaseController
   after_action :insert_pagination_headers, unless: -> { @statuses.empty? }
 
   def show
-    @statuses = load_statuses
+    ApplicationRecord.connected_to(role: :read, prevent_writes: true) do
+      @statuses = load_statuses
+      @relationships = StatusRelationshipsPresenter.new(@statuses, current_user&.account_id)
+    end
 
     render json: @statuses,
            each_serializer: REST::StatusSerializer,
-           relationships: StatusRelationshipsPresenter.new(@statuses, current_user&.account_id),
+           relationships: @relationships,
            status: account_home_feed.regenerating? ? 206 : 200
   end
 

app/workers/feed_insert_worker.rb

@@ -4,19 +4,23 @@ class FeedInsertWorker
   include Sidekiq::Worker
 
   def perform(status_id, id, type = 'home', options = {})
-    @type      = type.to_sym
-    @status    = Status.find(status_id)
-    @options   = options.symbolize_keys
+    ApplicationRecord.connected_to(role: :primary) do
+      @type      = type.to_sym
+      @status    = Status.find(status_id)
+      @options   = options.symbolize_keys
 
-    case @type
-    when :home, :tags
-      @follower = Account.find(id)
-    when :list
-      @list     = List.find(id)
-      @follower = @list.account
+      case @type
+      when :home, :tags
+        @follower = Account.find(id)
+      when :list
+        @list     = List.find(id)
+        @follower = @list.account
+      end
     end
 
-    check_and_insert
+    ApplicationRecord.connected_to(role: :read, prevent_writes: true) do
+      check_and_insert
+    end
   rescue ActiveRecord::RecordNotFound
     true
   end