Client implementation GetRawChanges

Part of https://gitlab.com/gitlab-org/gitaly/issues/1138

lib/gitlab/git/raw_diff_change.rb

@@ -6,8 +6,16 @@ module Gitlab
       attr_reader :blob_id, :blob_size, :old_path, :new_path, :operation
 
       def initialize(raw_change)
+        if raw_change.is_a?(Gitaly::GetRawChangesResponse::RawChange)
+          @blob_id = raw_change.blob_id
+          @blob_size = raw_change.size
+          @old_path = raw_change.old_path.presence
+          @new_path = raw_change.new_path.presence
+          @operation = raw_change.operation&.downcase || :unknown
+        else
           parse(raw_change)
         end
+      end
 
       private
 

lib/gitlab/git/repository.rb

@@ -581,6 +581,13 @@ module Gitlab
       # old_rev and new_rev are commit ID's
       # the result of this method is an array of Gitlab::Git::RawDiffChange
       def raw_changes_between(old_rev, new_rev)
+        gitaly_migrate(:raw_changes_between) do |is_enabled|
+          if is_enabled
+            gitaly_repository_client.raw_changes_between(old_rev, new_rev)
+              .each_with_object([]) do |msg, arr|
+              msg.raw_changes.each { |change| arr << ::Gitlab::Git::RawDiffChange.new(change) }
+            end
+          else
             result = []
 
             circuit_breaker.perform do
@@ -595,6 +602,10 @@ module Gitlab
 
             result
           end
+        end
+      rescue ArgumentError => e
+        raise Gitlab::Git::Repository::GitError.new(e)
+      end
 
       # Returns the SHA of the most recent common ancestor of +from+ and +to+
       def merge_base(from, to)

lib/gitlab/gitaly_client/repository_service.rb

@@ -293,6 +293,12 @@ module Gitlab
         response = GitalyClient.call(@storage, :repository_service, :calculate_checksum, request)
         response.checksum.presence
       end
+
+      def raw_changes_between(from, to)
+        request = Gitaly::GetRawChangesRequest.new(repository: @gitaly_repo, from_revision: from, to_revision: to)
+
+        GitalyClient.call(@storage, :repository_service, :get_raw_changes, request)
+      end
     end
   end
 end

spec/lib/gitlab/git/repository_spec.rb

@@ -1068,6 +1068,7 @@ describe Gitlab::Git::Repository, seed_helper: true do
   end
 
   describe '#raw_changes_between' do
+    shared_examples 'raw changes' do
       let(:old_rev) { }
       let(:new_rev) { }
       let(:changes) { repository.raw_changes_between(old_rev, new_rev) }
@@ -1105,6 +1106,15 @@ describe Gitlab::Git::Repository, seed_helper: true do
       end
     end
 
+    context 'when gitaly is enabled' do
+      it_behaves_like 'raw changes'
+    end
+
+    context 'when gitaly is disabled', :disable_gitaly do
+      it_behaves_like 'raw changes'
+    end
+  end
+
   describe '#merge_base' do
     shared_examples '#merge_base' do
       where(:from, :to, :result) do

spec/lib/gitlab/gitaly_client/repository_service_spec.rb

@@ -167,4 +167,15 @@ describe Gitlab::GitalyClient::RepositoryService do
       client.create_from_snapshot('http://example.com?wiki=1', 'Custom xyz')
     end
   end
+
+  describe '#raw_changes_between' do
+    it 'sends a create_repository_from_snapshot message' do
+      expect_any_instance_of(Gitaly::RepositoryService::Stub)
+        .to receive(:get_raw_changes)
+        .with(gitaly_request_with_path(storage_name, relative_path), kind_of(Hash))
+        .and_return(double)
+
+      client.raw_changes_between('deadbeef', 'deadpork')
+    end
+  end
 end