Backport of 12014-incremental-es-wiki-updates

Bringing in the DB migration and some light changes for CE classes

app/services/git/wiki_push_service.rb

+# frozen_string_literal: true
+
+module Git
+  class WikiPushService < ::BaseService
+    def execute
+      # This is used in EE
+    end
+  end
+end

app/workers/post_receive.rb

@@ -30,15 +30,17 @@ class PostReceive
 
   private
 
+  def identify_user(post_received)
+    post_received.identify.tap do |user|
+      log("Triggered hook for non-existing user \"#{post_received.identifier}\"") unless user
+    end
+  end
+
   def process_project_changes(post_received)
     changes = []
     refs = Set.new
-    @user = post_received.identify
-
-    unless @user
-      log("Triggered hook for non-existing user \"#{post_received.identifier}\"")
-      return false
-    end
+    user = identify_user(post_received)
+    return false unless user
 
     post_received.enum_for(:changes_refs).with_index do |(oldrev, newrev, ref), index|
       service_klass =
@@ -51,7 +53,7 @@ class PostReceive
       if service_klass
         service_klass.new(
           post_received.project,
-          @user,
+          user,
           oldrev: oldrev,
           newrev: newrev,
           ref: ref,
@@ -64,7 +66,7 @@ class PostReceive
       refs << ref
     end
 
-    after_project_changes_hooks(post_received, @user, refs.to_a, changes)
+    after_project_changes_hooks(post_received, user, refs.to_a, changes)
   end
 
   def after_project_changes_hooks(post_received, user, refs, changes)
@@ -76,6 +78,11 @@ class PostReceive
     post_received.project.touch(:last_activity_at, :last_repository_updated_at)
     post_received.project.wiki.repository.expire_statistics_caches
     ProjectCacheWorker.perform_async(post_received.project.id, [], [:wiki_size])
+
+    user = identify_user(post_received)
+    return false unless user
+
+    ::Git::WikiPushService.new(post_received.project, user, changes: post_received.enum_for(:changes_refs)).execute
   end
 
   def log(message)

db/migrate/20190607205656_add_wiki_columns_to_index_status.rb

+# frozen_string_literal: true
+
+class AddWikiColumnsToIndexStatus < ActiveRecord::Migration[5.1]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  def change
+    add_column :index_statuses, :last_wiki_commit, :binary
+    add_column :index_statuses, :wiki_indexed_at, :datetime_with_timezone
+  end
+end

db/schema.rb

@@ -1572,6 +1572,8 @@ ActiveRecord::Schema.define(version: 20190613030606) do
     t.string "last_commit"
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
+    t.binary "last_wiki_commit"
+    t.datetime_with_timezone "wiki_indexed_at"
     t.index ["project_id"], name: "index_index_statuses_on_project_id", unique: true, using: :btree
   end