Client implementation GetRawChanges

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

lib/gitlab/git/raw_diff_change.rb

@@ -6,7 +6,15 @@ module Gitlab
       attr_reader :blob_id, :blob_size, :old_path, :new_path, :operation
       def initialize(raw_change)
-        parse(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

@@ -581,19 +581,30 @@ 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)
-        result = []
-        circuit_breaker.perform do
-          Open3.pipeline_r(git_diff_cmd(old_rev, new_rev), format_git_cat_file_script, git_cat_file_cmd) do |last_stdout, wait_threads|
-            last_stdout.each_line { |line| result << ::Gitlab::Git::RawDiffChange.new(line.chomp!) }
-            if wait_threads.any? { |waiter| !waiter.value&.success? }
-              raise ::Gitlab::Git::Repository::GitError, "Unabled to obtain changes between #{old_rev} and #{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
+              Open3.pipeline_r(git_diff_cmd(old_rev, new_rev), format_git_cat_file_script, git_cat_file_cmd) do |last_stdout, wait_threads|
+                last_stdout.each_line { |line| result << ::Gitlab::Git::RawDiffChange.new(line.chomp!) }
+                if wait_threads.any? { |waiter| !waiter.value&.success? }
+                  raise ::Gitlab::Git::Repository::GitError, "Unabled to obtain changes between #{old_rev} and #{new_rev}"
+                end
+              end
             end
+
+            result
           end
         end
-
-        result
+      rescue ArgumentError => e
+        raise Gitlab::Git::Repository::GitError.new(e)
       end
       # Returns the SHA of the most recent common ancestor of +from+ and +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

@@ -1068,41 +1068,51 @@ describe Gitlab::Git::Repository, seed_helper: true do
   end
   describe '#raw_changes_between' do
-    let(:old_rev) { }
-    let(:new_rev) { }
-    let(:changes) { repository.raw_changes_between(old_rev, new_rev) }
-    context 'initial commit' do
-      let(:old_rev) { Gitlab::Git::BLANK_SHA }
-      let(:new_rev) { '1a0b36b3cdad1d2ee32457c102a8c0b7056fa863' }
-      it 'returns the changes' do
-        expect(changes).to be_present
-        expect(changes.size).to eq(3)
+    shared_examples 'raw changes' do
+      let(:old_rev) { }
+      let(:new_rev) { }
+      let(:changes) { repository.raw_changes_between(old_rev, new_rev) }
+      context 'initial commit' do
+        let(:old_rev) { Gitlab::Git::BLANK_SHA }
+        let(:new_rev) { '1a0b36b3cdad1d2ee32457c102a8c0b7056fa863' }
+        it 'returns the changes' do
+          expect(changes).to be_present
+          expect(changes.size).to eq(3)
+        end
       end
-    end
-    context 'with an invalid rev' do
-      let(:old_rev) { 'foo' }
-      let(:new_rev) { 'bar' }
-      it 'returns an error' do
-        expect { changes }.to raise_error(Gitlab::Git::Repository::GitError)
+      context 'with an invalid rev' do
+        let(:old_rev) { 'foo' }
+        let(:new_rev) { 'bar' }
+        it 'returns an error' do
+          expect { changes }.to raise_error(Gitlab::Git::Repository::GitError)
+        end
       end
-    end
-    context 'with valid revs' do
-      let(:old_rev) { 'fa1b1e6c004a68b7d8763b86455da9e6b23e36d6' }
-      let(:new_rev) { '4b4918a572fa86f9771e5ba40fbd48e1eb03e2c6' }
-      it 'returns the changes' do
-        expect(changes.size).to eq(9)
-        expect(changes.first.operation).to eq(:modified)
-        expect(changes.first.new_path).to eq('.gitmodules')
-        expect(changes.last.operation).to eq(:added)
-        expect(changes.last.new_path).to eq('files/lfs/picture-invalid.png')
+      context 'with valid revs' do
+        let(:old_rev) { 'fa1b1e6c004a68b7d8763b86455da9e6b23e36d6' }
+        let(:new_rev) { '4b4918a572fa86f9771e5ba40fbd48e1eb03e2c6' }
+        it 'returns the changes' do
+          expect(changes.size).to eq(9)
+          expect(changes.first.operation).to eq(:modified)
+          expect(changes.first.new_path).to eq('.gitmodules')
+          expect(changes.last.operation).to eq(:added)
+          expect(changes.last.new_path).to eq('files/lfs/picture-invalid.png')
+        end
       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

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