Revert "Don't use the redis set cache yet"

This reverts commit 034f0340.

app/models/repository.rb

@@ -249,13 +249,13 @@ class Repository
   def branch_exists?(branch_name)
     return false unless raw_repository
 
-    branch_names.include?(branch_name)
+    branch_names_include?(branch_name)
   end
 
   def tag_exists?(tag_name)
     return false unless raw_repository
 
-    tag_names.include?(tag_name)
+    tag_names_include?(tag_name)
   end
 
   def ref_exists?(ref)
@@ -559,10 +559,10 @@ class Repository
   end
 
   delegate :branch_names, to: :raw_repository
-  cache_method :branch_names, fallback: []
+  cache_method_as_redis_set :branch_names, fallback: []
 
   delegate :tag_names, to: :raw_repository
-  cache_method :tag_names, fallback: []
+  cache_method_as_redis_set :tag_names, fallback: []
 
   delegate :branch_count, :tag_count, :has_visible_content?, to: :raw_repository
   cache_method :branch_count, fallback: 0

changelogs/unreleased/64251-branch-name-set-cache.yml

+---
+title: Cache branch and tag names as Redis sets
+merge_request: 30476
+author:
+type: performance

spec/models/repository_spec.rb

@@ -1223,36 +1223,66 @@ describe Repository do
   end
 
   describe '#branch_exists?' do
-    it 'uses branch_names' do
-      allow(repository).to receive(:branch_names).and_return(['foobar'])
+    let(:branch) { repository.root_ref }
 
-      expect(repository.branch_exists?('foobar')).to eq(true)
-      expect(repository.branch_exists?('master')).to eq(false)
+    subject { repository.branch_exists?(branch) }
+
+    it 'delegates to branch_names when the cache is empty' do
+      repository.expire_branches_cache
+
+      expect(repository).to receive(:branch_names).and_call_original
+      is_expected.to eq(true)
+    end
+
+    it 'uses redis set caching when the cache is filled' do
+      repository.branch_names # ensure the branch name cache is filled
+
+      expect(repository)
+        .to receive(:branch_names_include?)
+        .with(branch)
+        .and_call_original
+
+      is_expected.to eq(true)
     end
   end
 
   describe '#tag_exists?' do
-    it 'uses tag_names' do
-      allow(repository).to receive(:tag_names).and_return(['foobar'])
+    let(:tag) { repository.tags.first.name }
+
+    subject { repository.tag_exists?(tag) }
+
+    it 'delegates to tag_names when the cache is empty' do
+      repository.expire_tags_cache
+
+      expect(repository).to receive(:tag_names).and_call_original
+      is_expected.to eq(true)
+    end
+
+    it 'uses redis set caching when the cache is filled' do
+      repository.tag_names # ensure the tag name cache is filled
+
+      expect(repository)
+        .to receive(:tag_names_include?)
+        .with(tag)
+        .and_call_original
 
-      expect(repository.tag_exists?('foobar')).to eq(true)
-      expect(repository.tag_exists?('master')).to eq(false)
+      is_expected.to eq(true)
     end
   end
 
-  describe '#branch_names', :use_clean_rails_memory_store_caching do
+  describe '#branch_names', :clean_gitlab_redis_cache do
     let(:fake_branch_names) { ['foobar'] }
 
     it 'gets cached across Repository instances' do
       allow(repository.raw_repository).to receive(:branch_names).once.and_return(fake_branch_names)
 
-      expect(repository.branch_names).to eq(fake_branch_names)
+      expect(repository.branch_names).to match_array(fake_branch_names)
 
       fresh_repository = Project.find(project.id).repository
       expect(fresh_repository.object_id).not_to eq(repository.object_id)
 
       expect(fresh_repository.raw_repository).not_to receive(:branch_names)
-      expect(fresh_repository.branch_names).to eq(fake_branch_names)
+      expect(fresh_repository.branch_names).to match_array(fake_branch_names)
     end
   end