Commit be8a320b authored by Oswaldo Ferreira's avatar Oswaldo Ferreira

Use persisted diff data instead fetching Git on discussions

Today, when fetching diffs of a note, we always go to Gitaly in order to diff between commits and return the diff of each discussion note. With this change we avoid doing that for notes on the "current version" of the MR.
parent 5af7fd59
......@@ -54,7 +54,20 @@ class DiffNote < Note
end
def diff_file
@diff_file ||= self.original_position.diff_file(self.project.repository)
@diff_file ||=
begin
if created_at_diff?(noteable.diff_refs)
# We're able to use the already persisted diffs (Postgres) if we're
# presenting a "current version" of the MR discussion diff.
# So no need to make an extra Gitaly diff request for it.
# As an extra benefit, the returned `diff_file` already
# has `highlighted_diff_lines` data set from Redis on
# `Diff::FileCollection::MergeRequestDiff`.
noteable.diffs(paths: original_position.paths, expanded: true).diff_files.first
else
original_position.diff_file(self.project.repository)
end
end
end
def diff_line
......
---
title: Use persisted diff data instead fetching Git on discussions
merge_request:
author:
type: performance
......@@ -36,6 +36,8 @@ module Gitlab
private
def decorate_diff!(diff)
return diff if diff.is_a?(File)
Gitlab::Diff::File.new(diff, repository: project.repository, diff_refs: diff_refs, fallback_diff_refs: fallback_diff_refs)
end
end
......
......@@ -85,12 +85,35 @@ describe DiffNote do
end
describe "#diff_file" do
it "returns the correct diff file" do
diff_file = subject.diff_file
context 'when the discussion was created in the diff' do
it 'returns correct diff file' do
diff_file = subject.diff_file
expect(diff_file.old_path).to eq(position.old_path)
expect(diff_file.new_path).to eq(position.new_path)
expect(diff_file.diff_refs).to eq(position.diff_refs)
expect(diff_file.old_path).to eq(position.old_path)
expect(diff_file.new_path).to eq(position.new_path)
expect(diff_file.diff_refs).to eq(position.diff_refs)
end
end
context 'when discussion is outdated or not created in the diff' do
let(:diff_refs) { project.commit(sample_commit.id).diff_refs }
let(:position) do
Gitlab::Diff::Position.new(
old_path: "files/ruby/popen.rb",
new_path: "files/ruby/popen.rb",
old_line: nil,
new_line: 14,
diff_refs: diff_refs
)
end
it 'returns the correct diff file' do
diff_file = subject.diff_file
expect(diff_file.old_path).to eq(position.old_path)
expect(diff_file.new_path).to eq(position.new_path)
expect(diff_file.diff_refs).to eq(position.diff_refs)
end
end
end
......
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