Update project statistics when some snippet events happens

In this update with update the snippet and project statistics
after a git operation is performed on the snippet repository
or when the snippet is deleted.

app/services/snippets/destroy_service.rb

@@ -27,6 +27,11 @@ module Snippets
 
       attempt_destroy!
 
+      # Update project statistics if the snippet is a Project one
+      if snippet.project_id
+        ProjectCacheWorker.perform_async(snippet.project_id, [], [:snippets_size])
+      end
+
       ServiceResponse.success(message: 'Snippet was deleted.')
     rescue DestroyError
       service_response_error('Failed to remove snippet repository.', 400)

app/services/snippets/update_statistics_service.rb

+# frozen_string_literal: true
+
+module Snippets
+  class UpdateStatisticsService
+    attr_reader :snippet
+
+    def initialize(snippet)
+      @snippet = snippet
+    end
+
+    def execute
+      unless snippet.repository_exists?
+        return ServiceResponse.error(message: 'Invalid snippet repository', http_status: 400)
+      end
+
+      snippet.repository.expire_statistics_caches
+      statistics.refresh!
+
+      # Update project statistics if the snippet is a Project one
+      if snippet.project_id
+        ProjectCacheWorker.perform_async(snippet.project_id, [], [:snippets_size])
+      end
+
+      ServiceResponse.success(message: 'Snippet statistics successfully updated.')
+    end
+
+    private
+
+    def statistics
+      @statistics ||= snippet.statistics || snippet.build_statistics
+    end
+  end
+end

app/workers/post_receive.rb

@@ -79,7 +79,7 @@ class PostReceive # rubocop:disable Scalability/IdempotentWorker
     return false unless user
 
     expire_caches(post_received, snippet.repository)
-    snippet.repository.expire_statistics_caches
+    Snippets::UpdateStatisticsService.new(snippet).execute
   end
 
   # Expire the repository status, branch, and tag cache once per push.

changelogs/unreleased/fj-223701-update-snippets-statistics-after-post-receive.yml

+---
+title: Update snippet and project statistics after certain events
+merge_request: 35340
+author:
+type: changed

spec/services/snippets/destroy_service_spec.rb

@@ -105,6 +105,13 @@ RSpec.describe Snippets::DestroyService do
 
         it_behaves_like 'a successful destroy'
         it_behaves_like 'deletes the snippet repository'
+
+        it 'schedules a project cache update for snippet_size' do
+          expect(ProjectCacheWorker).to receive(:perform_async)
+                                          .with(snippet.project_id, [], [:snippets_size])
+
+          subject
+        end
       end
 
       context 'when user is not able to admin_project_snippet' do
@@ -122,6 +129,12 @@ RSpec.describe Snippets::DestroyService do
 
         it_behaves_like 'a successful destroy'
         it_behaves_like 'deletes the snippet repository'
+
+        it 'does not schedule a project cache update' do
+          expect(ProjectCacheWorker).not_to receive(:perform_async)
+
+          subject
+        end
       end
 
       context 'when user is not able to admin_personal_snippet' do

spec/services/snippets/update_statistics_service_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Snippets::UpdateStatisticsService do
+  describe '#execute' do
+    subject { described_class.new(snippet).execute }
+
+    shared_examples 'updates statistics' do
+      it 'returns a successful response' do
+        expect(subject).to be_success
+      end
+
+      it 'expires statistics cache' do
+        expect(snippet.repository).to receive(:expire_statistics_caches)
+
+        subject
+      end
+
+      it 'schedules project cache worker based on type' do
+        if snippet.project_id
+          expect(ProjectCacheWorker).to receive(:perform_async)
+                                          .with(snippet.project_id, [], [:snippets_size])
+        else
+          expect(ProjectCacheWorker).not_to receive(:perform_async)
+        end
+
+        subject
+      end
+
+      context 'when snippet statistics does not exist' do
+        it 'creates snippet statistics' do
+          snippet.statistics.delete
+          snippet.reload
+
+          expect do
+            subject
+          end.to change(SnippetStatistics, :count).by(1)
+
+          expect(snippet.statistics.commit_count).not_to be_zero
+          expect(snippet.statistics.file_count).not_to be_zero
+          expect(snippet.statistics.repository_size).not_to be_zero
+        end
+      end
+
+      context 'when snippet statistics exists' do
+        it 'updates snippet statistics' do
+          expect(snippet.statistics.commit_count).to be_zero
+          expect(snippet.statistics.file_count).to be_zero
+          expect(snippet.statistics.repository_size).to be_zero
+
+          subject
+
+          expect(snippet.statistics.commit_count).not_to be_zero
+          expect(snippet.statistics.file_count).not_to be_zero
+          expect(snippet.statistics.repository_size).not_to be_zero
+        end
+      end
+
+      context 'when snippet does not have a repository' do
+        it 'returns an error response' do
+          expect(snippet).to receive(:repository_exists?).and_return(false)
+
+          expect(subject).to be_error
+        end
+      end
+    end
+
+    context 'with PersonalSnippet' do
+      let!(:snippet) { create(:personal_snippet, :repository) }
+
+      it_behaves_like 'updates statistics'
+    end
+
+    context 'with ProjectSnippet' do
+      let!(:snippet) { create(:project_snippet, :repository) }
+
+      it_behaves_like 'updates statistics'
+    end
+  end
+end

spec/workers/post_receive_spec.rb

@@ -428,7 +428,12 @@ RSpec.describe PostReceive do
           it 'expires the status cache' do
             expect(snippet.repository).to receive(:empty?).and_return(true)
             expect(snippet.repository).to receive(:expire_status_cache)
-            expect(snippet.repository).to receive(:expire_statistics_caches)
+
+            perform
+          end
+
+          it 'updates snippet statistics' do
+            expect(Snippets::UpdateStatisticsService).to receive(:new).with(snippet).and_call_original
 
             perform
           end