1 files changed, 57 insertions, 0 deletions
diff --git a/lib/gitlab/hashed_storage/migrator.rb b/lib/gitlab/hashed_storage/migrator.rb
new file mode 100644
index 00000000000..9251ed654cd
--- /dev/null
+++ b/lib/gitlab/hashed_storage/migrator.rb
@@ -0,0 +1,57 @@
+module Gitlab
+  module HashedStorage
+    # Hashed Storage Migrator
+    #
+    # This is responsible for scheduling and flagging projects
+    # to be migrated from Legacy to Hashed storage, either one by one or in bulk.
+    class Migrator
+      BATCH_SIZE = 100
+
+      # Schedule a range of projects to be bulk migrated with #bulk_migrate asynchronously
+      #
+      # @param [Object] start first project id for the range
+      # @param [Object] finish last project id for the range
+      def bulk_schedule(start, finish)
+        StorageMigratorWorker.perform_async(start, finish)
+      end
+
+      # Start migration of projects from specified range
+      #
+      # Flagging a project to be migrated is a synchronous action,
+      # but the migration runs through async jobs
+      #
+      # @param [Object] start first project id for the range
+      # @param [Object] finish last project id for the range
+      def bulk_migrate(start, finish)
+        projects = build_relation(start, finish)
+
+        projects.with_route.find_each(batch_size: BATCH_SIZE) do |project|
+          migrate(project)
+        end
+      end
+
+      # Flag a project to me migrated
+      #
+      # @param [Object] project that will be migrated
+      def migrate(project)
+        Rails.logger.info "Starting storage migration of #{project.full_path} (ID=#{project.id})..."
+
+        project.migrate_to_hashed_storage!
+      rescue => err
+        Rails.logger.error("#{err.message} migrating storage of #{project.full_path} (ID=#{project.id}), trace - #{err.backtrace}")
+      end
+
+      private
+
+      def build_relation(start, finish)
+        relation = Project
+        table = Project.arel_table
+
+        relation = relation.where(table[:id].gteq(start)) if start
+        relation = relation.where(table[:id].lteq(finish)) if finish
+
+        relation
+      end
+    end
+  end
+end