Merge branch 'zj-feature-flag-default-on-catfile-cache' into 'master'

Feature flag default on catfile cache

Closes gitaly#1712

See merge request gitlab-org/gitlab-ce!29556

(cherry picked from commit 14d46afd9b3ee7482fa8be7bc6782b19e960ce45)

968674e4 Move Gitaly feature flag logic to Feature::Gitaly
4dfaaf40 Turn on Cat-File cache by default

3 files changed, 35 insertions, 20 deletions

diff --git a/lib/feature/gitaly.rb b/lib/feature/gitaly.rb
new file mode 100644
index 00000000000..d7a8f8a0b9e
--- /dev/null
+++ b/lib/feature/gitaly.rb
@@ -0,0 +1,31 @@
+# frozen_string_literal: true
+
+require 'set'
+
+class Feature
+  class Gitaly
+    # Server feature flags should use '_' to separate words.
+    # CATFILE_CACHE sets an incorrect example
+    CATFILE_CACHE = 'catfile-cache'.freeze
+
+    SERVER_FEATURE_FLAGS = [CATFILE_CACHE].freeze
+    DEFAULT_ON_FLAGS = Set.new([CATFILE_CACHE]).freeze
+
+    class << self
+      def enabled?(feature_flag)
+        return false unless Feature::FlipperFeature.table_exists?
+
+        default_on = DEFAULT_ON_FLAGS.include?(feature_flag)
+        Feature.enabled?("gitaly_#{feature_flag}", default_enabled: default_on)
+      rescue ActiveRecord::NoDatabaseError
+        false
+      end
+
+      def server_feature_flags
+        SERVER_FEATURE_FLAGS.map do |f|
+          ["gitaly-feature-#{f.tr('_', '-')}", enabled?(f).to_s]
+        end.to_h
+      end
+    end
+  end
+end
diff --git a/lib/gitlab/gitaly_client.rb b/lib/gitlab/gitaly_client.rb
index e683d4e5bbe..47976389af6 100644
--- a/lib/gitlab/gitaly_client.rb
+++ b/lib/gitlab/gitaly_client.rb
@@ -31,10 +31,6 @@ module Gitlab
     MAXIMUM_GITALY_CALLS = 30
     CLIENT_NAME = (Sidekiq.server? ? 'gitlab-sidekiq' : 'gitlab-web').freeze
 
-    SERVER_FEATURE_CATFILE_CACHE = 'catfile-cache'.freeze
-    # Server feature flags should use '_' to separate words.
-    SERVER_FEATURE_FLAGS = [SERVER_FEATURE_CATFILE_CACHE].freeze
-
     MUTEX = Mutex.new
 
     define_histogram :gitaly_controller_action_duration_seconds do
@@ -223,9 +219,9 @@ module Gitlab
       metadata['call_site'] = feature.to_s if feature
       metadata['gitaly-servers'] = address_metadata(remote_storage) if remote_storage
       metadata['x-gitlab-correlation-id'] = Labkit::Correlation::CorrelationId.current_id if Labkit::Correlation::CorrelationId.current_id
-      metadata['gitaly-session-id'] = session_id if feature_enabled?(SERVER_FEATURE_CATFILE_CACHE)
+      metadata['gitaly-session-id'] = session_id if Feature::Gitaly.enabled?(Feature::Gitaly::CATFILE_CACHE)
 
-      metadata.merge!(server_feature_flags)
+      metadata.merge!(Feature::Gitaly.server_feature_flags)
 
       result = { metadata: metadata }
 
@@ -244,12 +240,6 @@ module Gitlab
       Gitlab::SafeRequestStore[:gitaly_session_id] ||= SecureRandom.uuid
     end
 
-    def self.server_feature_flags
-      SERVER_FEATURE_FLAGS.map do |f|
-        ["gitaly-feature-#{f.tr('_', '-')}", feature_enabled?(f).to_s]
-      end.to_h
-    end
-
     def self.token(storage)
       params = Gitlab.config.repositories.storages[storage]
       raise "storage not found: #{storage.inspect}" if params.nil?
@@ -257,12 +247,6 @@ module Gitlab
       params['gitaly_token'].presence || Gitlab.config.gitaly['token']
     end
 
-    def self.feature_enabled?(feature_name)
-      Feature::FlipperFeature.table_exists? && Feature.enabled?("gitaly_#{feature_name}")
-    rescue ActiveRecord::NoDatabaseError
-      false
-    end
-
     # Ensures that Gitaly is not being abuse through n+1 misuse etc
     def self.enforce_gitaly_request_limits(call_site)
       # Only count limits in request-response environments (not sidekiq for example)
@@ -295,7 +279,7 @@ module Gitlab
       # check if the limit is being exceeded while testing in those environments
       # In that case we can use a feature flag to indicate that we do want to
       # enforce request limits.
-      return true if feature_enabled?('enforce_requests_limits')
+      return true if Feature::Gitaly.enabled?('enforce_requests_limits')
 
       !(Rails.env.production? || ENV["GITALY_DISABLE_REQUEST_LIMITS"])
     end
diff --git a/lib/gitlab/gitaly_client/storage_settings.rb b/lib/gitlab/gitaly_client/storage_settings.rb
index 78ef6bfc0ec..7d1206e551b 100644
--- a/lib/gitlab/gitaly_client/storage_settings.rb
+++ b/lib/gitlab/gitaly_client/storage_settings.rb
@@ -34,7 +34,7 @@ module Gitlab
       def self.disk_access_denied?
         return false if rugged_enabled?
 
-        !temporarily_allowed?(ALLOW_KEY) && GitalyClient.feature_enabled?(DISK_ACCESS_DENIED_FLAG)
+        !temporarily_allowed?(ALLOW_KEY) && Feature::Gitaly.enabled?(DISK_ACCESS_DENIED_FLAG)
       rescue
         false # Err on the side of caution, don't break gitlab for people
       end