Merge branch 'cache-refactor' into 'master'

Cache `#can_be_resolved_in_ui?` git operations

Closes gitaly#1051

See merge request gitlab-org/gitlab-ce!17589

5 files changed, 158 insertions, 103 deletions

diff --git a/spec/lib/gitlab/conflict/file_collection_spec.rb b/spec/lib/gitlab/conflict/file_collection_spec.rb
index 5944ce8049a..c93912db411 100644
--- a/spec/lib/gitlab/conflict/file_collection_spec.rb
+++ b/spec/lib/gitlab/conflict/file_collection_spec.rb
@@ -10,6 +10,38 @@ describe Gitlab::Conflict::FileCollection do
     end
   end
 
+  describe '#cache' do
+    it 'specifies a custom namespace with the merge request commit ids' do
+      our_commit = merge_request.source_branch_head.raw
+      their_commit = merge_request.target_branch_head.raw
+      custom_namespace = "#{our_commit.id}:#{their_commit.id}"
+
+      expect(file_collection.send(:cache).namespace).to include(custom_namespace)
+    end
+  end
+
+  describe '#can_be_resolved_in_ui?' do
+    it 'returns true if conflicts for this collection can be resolved in the UI' do
+      expect(file_collection.can_be_resolved_in_ui?).to be true
+    end
+
+    it "returns false if conflicts for this collection can't be resolved in the UI" do
+      expect(file_collection).to receive(:files).and_raise(Gitlab::Git::Conflict::Resolver::ConflictSideMissing)
+
+      expect(file_collection.can_be_resolved_in_ui?).to be false
+    end
+
+    it 'caches the result' do
+      expect(file_collection).to receive(:files).twice.and_call_original
+
+      expect(file_collection.can_be_resolved_in_ui?).to be true
+
+      expect(file_collection).not_to receive(:files)
+
+      expect(file_collection.can_be_resolved_in_ui?).to be true
+    end
+  end
+
   describe '#default_commit_message' do
     it 'matches the format of the git CLI commit message' do
       expect(file_collection.default_commit_message).to eq(<<EOM.chomp)
diff --git a/spec/lib/gitlab/repository_cache_adapter_spec.rb b/spec/lib/gitlab/repository_cache_adapter_spec.rb
new file mode 100644
index 00000000000..85971f2a7ef
--- /dev/null
+++ b/spec/lib/gitlab/repository_cache_adapter_spec.rb
@@ -0,0 +1,76 @@
+require 'spec_helper'
+
+describe Gitlab::RepositoryCacheAdapter do
+  let(:project) { create(:project, :repository) }
+  let(:repository) { project.repository }
+  let(:cache) { repository.send(:cache) }
+
+  describe '#cache_method_output', :use_clean_rails_memory_store_caching do
+    let(:fallback) { 10 }
+
+    context 'with a non-existing repository' do
+      let(:project) { create(:project) } # No repository
+
+      subject do
+        repository.cache_method_output(:cats, fallback: fallback) do
+          repository.cats_call_stub
+        end
+      end
+
+      it 'returns the fallback value' do
+        expect(subject).to eq(fallback)
+      end
+
+      it 'avoids calling the original method' do
+        expect(repository).not_to receive(:cats_call_stub)
+
+        subject
+      end
+    end
+
+    context 'with a method throwing a non-existing-repository error' do
+      subject do
+        repository.cache_method_output(:cats, fallback: fallback) do
+          raise Gitlab::Git::Repository::NoRepository
+        end
+      end
+
+      it 'returns the fallback value' do
+        expect(subject).to eq(fallback)
+      end
+
+      it 'does not cache the data' do
+        subject
+
+        expect(repository.instance_variable_defined?(:@cats)).to eq(false)
+        expect(cache.exist?(:cats)).to eq(false)
+      end
+    end
+
+    context 'with an existing repository' do
+      it 'caches the output' do
+        object = double
+
+        expect(object).to receive(:number).once.and_return(10)
+
+        2.times do
+          val = repository.cache_method_output(:cats) { object.number }
+
+          expect(val).to eq(10)
+        end
+
+        expect(repository.send(:cache).exist?(:cats)).to eq(true)
+        expect(repository.instance_variable_get(:@cats)).to eq(10)
+      end
+    end
+  end
+
+  describe '#expire_method_caches' do
+    it 'expires the caches of the given methods' do
+      expect(cache).to receive(:expire).with(:readme)
+      expect(cache).to receive(:expire).with(:gitignore)
+
+      repository.expire_method_caches(%i(readme gitignore))
+    end
+  end
+end
diff --git a/spec/lib/gitlab/repository_cache_spec.rb b/spec/lib/gitlab/repository_cache_spec.rb
new file mode 100644
index 00000000000..fc259cf1208
--- /dev/null
+++ b/spec/lib/gitlab/repository_cache_spec.rb
@@ -0,0 +1,50 @@
+require 'spec_helper'
+
+describe Gitlab::RepositoryCache do
+  let(:backend) { double('backend').as_null_object }
+  let(:project) { create(:project) }
+  let(:repository) { project.repository }
+  let(:namespace) { "#{repository.full_path}:#{project.id}" }
+  let(:cache) { described_class.new(repository, backend: backend) }
+
+  describe '#cache_key' do
+    subject { cache.cache_key(:foo) }
+
+    it 'includes the namespace' do
+      expect(subject).to eq "foo:#{namespace}"
+    end
+
+    context 'with a given namespace' do
+      let(:extra_namespace) { 'my:data' }
+      let(:cache) do
+        described_class.new(repository, extra_namespace: extra_namespace,
+                                        backend: backend)
+      end
+
+      it 'includes the full namespace' do
+        expect(subject).to eq "foo:#{namespace}:#{extra_namespace}"
+      end
+    end
+  end
+
+  describe '#expire' do
+    it 'expires the given key from the cache' do
+      cache.expire(:foo)
+      expect(backend).to have_received(:delete).with("foo:#{namespace}")
+    end
+  end
+
+  describe '#fetch' do
+    it 'fetches the given key from the cache' do
+      cache.fetch(:bar)
+      expect(backend).to have_received(:fetch).with("bar:#{namespace}")
+    end
+
+    it 'accepts a block' do
+      p = -> {}
+
+      cache.fetch(:baz, &p)
+      expect(backend).to have_received(:fetch).with("baz:#{namespace}", &p)
+    end
+  end
+end
diff --git a/spec/lib/repository_cache_spec.rb b/spec/lib/repository_cache_spec.rb
deleted file mode 100644
index 8b0c7254b5e..00000000000
--- a/spec/lib/repository_cache_spec.rb
+++ /dev/null
@@ -1,34 +0,0 @@
-require 'spec_helper'
-
-describe RepositoryCache do
-  let(:project) { create(:project) }
-  let(:backend) { double('backend').as_null_object }
-  let(:cache) { described_class.new('example', project.id, backend) }
-
-  describe '#cache_key' do
-    it 'includes the namespace' do
-      expect(cache.cache_key(:foo)).to eq "foo:example:#{project.id}"
-    end
-  end
-
-  describe '#expire' do
-    it 'expires the given key from the cache' do
-      cache.expire(:foo)
-      expect(backend).to have_received(:delete).with("foo:example:#{project.id}")
-    end
-  end
-
-  describe '#fetch' do
-    it 'fetches the given key from the cache' do
-      cache.fetch(:bar)
-      expect(backend).to have_received(:fetch).with("bar:example:#{project.id}")
-    end
-
-    it 'accepts a block' do
-      p = -> {}
-
-      cache.fetch(:baz, &p)
-      expect(backend).to have_received(:fetch).with("baz:example:#{project.id}", &p)
-    end
-  end
-end
diff --git a/spec/models/repository_spec.rb b/spec/models/repository_spec.rb
index 93a61c6ea71..5bc972bca14 100644
--- a/spec/models/repository_spec.rb
+++ b/spec/models/repository_spec.rb
@@ -2169,15 +2169,6 @@ describe Repository do
     end
   end
 
-  describe '#expire_method_caches' do
-    it 'expires the caches of the given methods' do
-      expect_any_instance_of(RepositoryCache).to receive(:expire).with(:readme)
-      expect_any_instance_of(RepositoryCache).to receive(:expire).with(:gitignore)
-
-      repository.expire_method_caches(%i(readme gitignore))
-    end
-  end
-
   describe '#expire_all_method_caches' do
     it 'expires the caches of all methods' do
       expect(repository).to receive(:expire_method_caches)
@@ -2323,66 +2314,6 @@ describe Repository do
     end
   end
 
-  describe '#cache_method_output', :use_clean_rails_memory_store_caching do
-    let(:fallback) { 10 }
-
-    context 'with a non-existing repository' do
-      let(:project) { create(:project) } # No repository
-
-      subject do
-        repository.cache_method_output(:cats, fallback: fallback) do
-          repository.cats_call_stub
-        end
-      end
-
-      it 'returns the fallback value' do
-        expect(subject).to eq(fallback)
-      end
-
-      it 'avoids calling the original method' do
-        expect(repository).not_to receive(:cats_call_stub)
-
-        subject
-      end
-    end
-
-    context 'with a method throwing a non-existing-repository error' do
-      subject do
-        repository.cache_method_output(:cats, fallback: fallback) do
-          raise Gitlab::Git::Repository::NoRepository
-        end
-      end
-
-      it 'returns the fallback value' do
-        expect(subject).to eq(fallback)
-      end
-
-      it 'does not cache the data' do
-        subject
-
-        expect(repository.instance_variable_defined?(:@cats)).to eq(false)
-        expect(repository.send(:cache).exist?(:cats)).to eq(false)
-      end
-    end
-
-    context 'with an existing repository' do
-      it 'caches the output' do
-        object = double
-
-        expect(object).to receive(:number).once.and_return(10)
-
-        2.times do
-          val = repository.cache_method_output(:cats) { object.number }
-
-          expect(val).to eq(10)
-        end
-
-        expect(repository.send(:cache).exist?(:cats)).to eq(true)
-        expect(repository.instance_variable_get(:@cats)).to eq(10)
-      end
-    end
-  end
-
   describe '#refresh_method_caches' do
     it 'refreshes the caches of the given types' do
       expect(repository).to receive(:expire_method_caches)