Merge branch 'repository-archive-worker' into 'master'

Archive repositories in background worker.

Depends on https://gitlab.com/gitlab-org/gitlab_git/merge_requests/17 being merged, a new `gitlab_git` being released and this MR's `Gemfile.lock` being updated..

See private issue https://dev.gitlab.org/gitlab/gitlabhq/issues/2173.

To do after this is merged: Update https://gitlab.com/gitlab-org/omnibus-gitlab/blob/master/files/gitlab-cookbooks/gitlab/templates/default/sv-sidekiq-run.erb in omnibus.

See merge request !436

14 files changed, 360 insertions, 20 deletions

diff --git a/CHANGELOG b/CHANGELOG
index 6e963fe965d..268e14d08b0 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -54,6 +54,7 @@ v 7.10.0 (unreleased)
   - Don't leak private group existence by redirecting from namespace controller to group controller.
   - Ability to skip some items from backup (database, respositories or uploads)
   - Fix "Hello @username." references not working by no longer allowing usernames to end in period.
+  - Archive repositories in background worker.
 
 
 v 7.9.2
diff --git a/Gemfile b/Gemfile
index e767aec5053..0dd285d0fdd 100644
--- a/Gemfile
+++ b/Gemfile
@@ -122,6 +122,7 @@ gem 'slim'
 gem 'sinatra', require: nil
 gem 'sidekiq', '~> 3.3'
 gem 'sidetiq', '0.6.3'
+gem 'sidekiq-limit_fetch'
 
 # HTTP requests
 gem "httparty"
diff --git a/Gemfile.lock b/Gemfile.lock
index ed8663b358b..c6ecdb4db0a 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -547,6 +547,8 @@ GEM
       json
       redis (>= 3.0.6)
       redis-namespace (>= 1.3.1)
+    sidekiq-limit_fetch (2.4.1)
+      sidekiq (>= 2.6.5, < 4.0)
     sidetiq (0.6.3)
       celluloid (>= 0.14.1)
       ice_cube (= 0.11.1)
@@ -769,6 +771,7 @@ DEPENDENCIES
   settingslogic
   shoulda-matchers (~> 2.7.0)
   sidekiq (~> 3.3)
+  sidekiq-limit_fetch
   sidetiq (= 0.6.3)
   simplecov
   sinatra
diff --git a/Procfile b/Procfile
index a0ab4a734a4..799b92729fa 100644
--- a/Procfile
+++ b/Procfile
@@ -1,2 +1,2 @@
 web: bundle exec unicorn_rails -p ${PORT:="3000"} -E ${RAILS_ENV:="development"} -c ${UNICORN_CONFIG:="config/unicorn.rb"}
-worker: bundle exec sidekiq -q post_receive -q mailer -q system_hook -q project_web_hook -q gitlab_shell -q common -q default
+worker: bundle exec sidekiq -q post_receive -q mailer -q archive_repo -q system_hook -q project_web_hook -q gitlab_shell -q common -q default
diff --git a/app/controllers/projects/repositories_controller.rb b/app/controllers/projects/repositories_controller.rb
index cbb888b25e8..96defb0c721 100644
--- a/app/controllers/projects/repositories_controller.rb
+++ b/app/controllers/projects/repositories_controller.rb
@@ -11,18 +11,18 @@ class Projects::RepositoriesController < Projects::ApplicationController
   end
 
   def archive
-    unless can?(current_user, :download_code, @project)
-      render_404 and return
+    begin
+      file_path = ArchiveRepositoryService.new(@project, params[:ref], params[:format]).execute
+    rescue
+      return head :not_found
     end
 
-    file_path = ArchiveRepositoryService.new.execute(@project, params[:ref], params[:format])
-
     if file_path
       # Send file to user
       response.headers["Content-Length"] = File.open(file_path).size.to_s
       send_file file_path
     else
-      render_404
+      redirect_to request.fullpath
     end
   end
 end
diff --git a/app/models/repository.rb b/app/models/repository.rb
index 77765cae1a0..72769498872 100644
--- a/app/models/repository.rb
+++ b/app/models/repository.rb
@@ -267,6 +267,9 @@ class Repository
   # Remove archives older than 2 hours
   def clean_old_archives
     repository_downloads_path = Gitlab.config.gitlab.repository_downloads_path
+
+    return unless File.directory?(repository_downloads_path)
+
     Gitlab::Popen.popen(%W(find #{repository_downloads_path} -not -path #{repository_downloads_path} -mmin +120 -delete))
   end
 
diff --git a/app/services/archive_repository_service.rb b/app/services/archive_repository_service.rb
index 8823f6fdc67..e1b41527d8d 100644
--- a/app/services/archive_repository_service.rb
+++ b/app/services/archive_repository_service.rb
@@ -1,14 +1,62 @@
 class ArchiveRepositoryService
-  def execute(project, ref, format)
-    storage_path = Gitlab.config.gitlab.repository_downloads_path
+  attr_reader :project, :ref, :format
 
-    unless File.directory?(storage_path)
-      FileUtils.mkdir_p(storage_path)
+  def initialize(project, ref, format)
+    format ||= 'tar.gz'
+    @project, @ref, @format = project, ref, format.downcase
+  end
+
+  def execute(options = {})
+    project.repository.clean_old_archives
+
+    raise "No archive file path" unless file_path
+
+    return file_path if archived?
+
+    unless archiving?
+      RepositoryArchiveWorker.perform_async(project.id, ref, format)
     end
 
-    format ||= 'tar.gz'
-    repository = project.repository
-    repository.clean_old_archives
-    repository.archive_repo(ref, storage_path, format.downcase)
+    archived = wait_until_archived(options[:timeout] || 5.0)
+
+    file_path if archived
+  end
+
+  private
+
+  def storage_path
+    Gitlab.config.gitlab.repository_downloads_path
+  end
+
+  def file_path
+    @file_path ||= project.repository.archive_file_path(ref, storage_path, format)
+  end
+
+  def pid_file_path
+    @pid_file_path ||= project.repository.archive_pid_file_path(ref, storage_path, format)
+  end
+
+  def archived?
+    File.exist?(file_path)
+  end
+
+  def archiving?
+    File.exist?(pid_file_path)
+  end
+
+  def wait_until_archived(timeout = 5.0)
+    return archived? if timeout == 0.0
+    
+    t1 = Time.now
+
+    begin
+      sleep 0.1
+
+      success = archived?
+
+      t2 = Time.now
+    end until success || t2 - t1 >= timeout
+
+    success
   end
 end
diff --git a/app/workers/repository_archive_worker.rb b/app/workers/repository_archive_worker.rb
new file mode 100644
index 00000000000..021c1139568
--- /dev/null
+++ b/app/workers/repository_archive_worker.rb
@@ -0,0 +1,43 @@
+class RepositoryArchiveWorker
+  include Sidekiq::Worker
+
+  sidekiq_options queue: :archive_repo
+
+  attr_accessor :project, :ref, :format
+
+  def perform(project_id, ref, format)
+    @project = Project.find(project_id)
+    @ref, @format = ref, format.downcase
+
+    repository = project.repository
+
+    repository.clean_old_archives
+
+    return unless file_path
+    return if archived? || archiving?
+
+    repository.archive_repo(ref, storage_path, format)
+  end
+
+  private
+
+  def storage_path
+    Gitlab.config.gitlab.repository_downloads_path
+  end
+
+  def file_path
+    @file_path ||= project.repository.archive_file_path(ref, storage_path, format)
+  end
+
+  def pid_file_path
+    @pid_file_path ||= project.repository.archive_pid_file_path(ref, storage_path, format)
+  end
+
+  def archived?
+    File.exist?(file_path)
+  end
+
+  def archiving?
+    File.exist?(pid_file_path)
+  end
+end
diff --git a/bin/background_jobs b/bin/background_jobs
index 59a51c5c868..a041a4b0433 100755
--- a/bin/background_jobs
+++ b/bin/background_jobs
@@ -37,7 +37,7 @@ start_no_deamonize()
 
 start_sidekiq()
 {
-  bundle exec sidekiq -q post_receive -q mailer -q system_hook -q project_web_hook -q gitlab_shell -q common -q default -e $RAILS_ENV -P $sidekiq_pidfile $@ >> $sidekiq_logfile 2>&1
+  bundle exec sidekiq -q post_receive -q mailer -q archive_repo -q system_hook -q project_web_hook -q gitlab_shell -q common -q default -e $RAILS_ENV -P $sidekiq_pidfile $@ >> $sidekiq_logfile 2>&1
 }
 
 load_ok()
diff --git a/config/initializers/4_sidekiq.rb b/config/initializers/4_sidekiq.rb
index e856499732e..da2e8a08b07 100644
--- a/config/initializers/4_sidekiq.rb
+++ b/config/initializers/4_sidekiq.rb
@@ -25,3 +25,5 @@ Sidekiq.configure_client do |config|
     namespace: 'resque:gitlab'
   }
 end
+
+Sidekiq::Queue["archive_repo"].limit = 2
diff --git a/lib/api/repositories.rb b/lib/api/repositories.rb
index b259914a01c..1fbf3dca3c6 100644
--- a/lib/api/repositories.rb
+++ b/lib/api/repositories.rb
@@ -133,10 +133,11 @@ module API
         authorize! :download_code, user_project
 
         begin
-          file_path = ArchiveRepositoryService.new.execute(
-              user_project,
-              params[:sha],
-              params[:format])
+          file_path = ArchiveRepositoryService.new(
+            user_project,
+            params[:sha],
+            params[:format]
+          ).execute
         rescue
           not_found!('File')
         end
@@ -149,7 +150,7 @@ module API
           env['api.format'] = :binary
           present data
         else
-          not_found!('File')
+          redirect request.fullpath
         end
       end
 
diff --git a/spec/controllers/projects/repositories_controller_spec.rb b/spec/controllers/projects/repositories_controller_spec.rb
new file mode 100644
index 00000000000..91856ed0cc0
--- /dev/null
+++ b/spec/controllers/projects/repositories_controller_spec.rb
@@ -0,0 +1,65 @@
+require "spec_helper"
+
+describe Projects::RepositoriesController do
+  let(:project) { create(:project) }
+  let(:user)    { create(:user) }
+
+  describe "GET archive" do
+    before do
+      sign_in(user)
+      project.team << [user, :developer]
+
+      allow(ArchiveRepositoryService).to receive(:new).and_return(service)
+    end
+
+    let(:service) { ArchiveRepositoryService.new(project, "master", "zip") }
+
+    it "executes ArchiveRepositoryService" do
+      expect(ArchiveRepositoryService).to receive(:new).with(project, "master", "zip")
+      expect(service).to receive(:execute)
+
+      get :archive, namespace_id: project.namespace.path, project_id: project.path, ref: "master", format: "zip"
+    end
+
+    context "when the service raises an error" do
+
+      before do
+        allow(service).to receive(:execute).and_raise("Archive failed")
+      end
+
+      it "renders Not Found" do
+        get :archive, namespace_id: project.namespace.path, project_id: project.path, ref: "master", format: "zip"
+
+        expect(response.status).to eq(404)
+      end
+    end
+
+    context "when the service doesn't return a path" do
+
+      before do
+        allow(service).to receive(:execute).and_return(nil)
+      end
+
+      it "reloads the page" do
+        get :archive, namespace_id: project.namespace.path, project_id: project.path, ref: "master", format: "zip"
+
+        expect(response).to redirect_to(archive_namespace_project_repository_path(project.namespace, project, ref: "master", format: "zip"))
+      end
+    end
+
+    context "when the service returns a path" do
+
+      let(:path) { Rails.root.join("spec/fixtures/dk.png").to_s }
+
+      before do
+        allow(service).to receive(:execute).and_return(path)
+      end
+
+      it "sends the file" do
+        get :archive, namespace_id: project.namespace.path, project_id: project.path, ref: "master", format: "zip"
+
+        expect(response.body).to eq(File.binread(path))
+      end
+    end
+  end
+end
diff --git a/spec/services/archive_repository_service_spec.rb b/spec/services/archive_repository_service_spec.rb
new file mode 100644
index 00000000000..f168a913976
--- /dev/null
+++ b/spec/services/archive_repository_service_spec.rb
@@ -0,0 +1,93 @@
+require 'spec_helper'
+
+describe ArchiveRepositoryService do
+  let(:project) { create(:project) }
+  subject { ArchiveRepositoryService.new(project, "master", "zip") }
+
+  describe "#execute" do
+    it "cleans old archives" do
+      expect(project.repository).to receive(:clean_old_archives)
+
+      subject.execute(timeout: 0.0)
+    end
+
+    context "when the repository doesn't have an archive file path" do
+      before do
+        allow(project.repository).to receive(:archive_file_path).and_return(nil)
+      end
+
+      it "raises an error" do
+        expect {
+          subject.execute(timeout: 0.0)
+        }.to raise_error
+      end
+    end
+
+    context "when the repository has an archive file path" do
+      let(:file_path)     { "/archive.zip" }
+      let(:pid_file_path) { "/archive.zip.pid" }
+
+      before do
+        allow(project.repository).to receive(:archive_file_path).and_return(file_path)
+        allow(project.repository).to receive(:archive_pid_file_path).and_return(pid_file_path)
+      end
+
+      context "when the archive file already exists" do
+        before do
+          allow(File).to receive(:exist?).with(file_path).and_return(true)
+        end
+
+        it "returns the file path" do
+          expect(subject.execute(timeout: 0.0)).to eq(file_path)
+        end
+      end
+
+      context "when the archive file doesn't exist yet" do
+        before do
+          allow(File).to receive(:exist?).with(file_path).and_return(false)
+          allow(File).to receive(:exist?).with(pid_file_path).and_return(true)
+        end
+
+        context "when the archive pid file doesn't exist yet" do
+          before do
+            allow(File).to receive(:exist?).with(pid_file_path).and_return(false)
+          end
+
+          it "queues the RepositoryArchiveWorker" do
+            expect(RepositoryArchiveWorker).to receive(:perform_async)
+
+            subject.execute(timeout: 0.0)
+          end
+        end
+
+        context "when the archive pid file already exists" do
+          it "doesn't queue the RepositoryArchiveWorker" do
+            expect(RepositoryArchiveWorker).not_to receive(:perform_async)
+
+            subject.execute(timeout: 0.0)
+          end
+        end
+
+        context "when the archive file exists after a little while" do
+          before do
+            Thread.new do
+              sleep 0.1
+              allow(File).to receive(:exist?).with(file_path).and_return(true)
+            end
+          end
+
+          it "returns the file path" do
+            expect(subject.execute(timeout: 0.2)).to eq(file_path)
+          end
+        end
+
+        context "when the archive file doesn't exist after the timeout" do
+          it "returns nil" do
+            expect(subject.execute(timeout: 0.0)).to eq(nil)
+          end
+        end
+      end
+    end
+  end
+end
+
diff --git a/spec/workers/repository_archive_worker_spec.rb b/spec/workers/repository_archive_worker_spec.rb
new file mode 100644
index 00000000000..c2362058cfd
--- /dev/null
+++ b/spec/workers/repository_archive_worker_spec.rb
@@ -0,0 +1,80 @@
+require 'spec_helper'
+
+describe RepositoryArchiveWorker do
+  let(:project) { create(:project) }
+  subject { RepositoryArchiveWorker.new }
+
+  before do
+    allow(Project).to receive(:find).and_return(project)
+  end
+
+  describe "#perform" do
+    it "cleans old archives" do
+      expect(project.repository).to receive(:clean_old_archives)
+
+      subject.perform(project.id, "master", "zip")
+    end
+
+    context "when the repository doesn't have an archive file path" do
+      before do
+        allow(project.repository).to receive(:archive_file_path).and_return(nil)
+      end
+
+      it "doesn't archive the repo" do
+        expect(project.repository).not_to receive(:archive_repo)
+
+        subject.perform(project.id, "master", "zip")
+      end
+    end
+
+    context "when the repository has an archive file path" do
+      let(:file_path)     { "/archive.zip" }
+      let(:pid_file_path) { "/archive.zip.pid" }
+
+      before do
+        allow(project.repository).to receive(:archive_file_path).and_return(file_path)
+        allow(project.repository).to receive(:archive_pid_file_path).and_return(pid_file_path)
+      end
+
+      context "when the archive file already exists" do
+        before do
+          allow(File).to receive(:exist?).with(file_path).and_return(true)
+        end
+
+        it "doesn't archive the repo" do
+          expect(project.repository).not_to receive(:archive_repo)
+
+          subject.perform(project.id, "master", "zip")
+        end
+      end
+
+      context "when the archive file doesn't exist yet" do
+        before do
+          allow(File).to receive(:exist?).with(file_path).and_return(false)
+          allow(File).to receive(:exist?).with(pid_file_path).and_return(true)
+        end
+
+        context "when the archive pid file doesn't exist yet" do
+          before do
+            allow(File).to receive(:exist?).with(pid_file_path).and_return(false)
+          end
+
+          it "archives the repo" do
+            expect(project.repository).to receive(:archive_repo)
+
+            subject.perform(project.id, "master", "zip")
+          end
+        end
+
+        context "when the archive pid file already exists" do
+          it "doesn't archive the repo" do
+            expect(project.repository).not_to receive(:archive_repo)
+
+            subject.perform(project.id, "master", "zip")
+          end
+        end
+      end
+    end
+  end
+end
+