Merge branch 'if-64257-active_session_lookup_key_cleanup' into 'master'

Rake task to cleanup expired ActiveSession lookup keys

See merge request gitlab-org/gitlab-ce!30668

app/models/active_session.rb

@@ -93,12 +93,12 @@ class ActiveSession
   end
 
   def self.list_sessions(user)
-    sessions_from_ids(session_ids_for_user(user))
+    sessions_from_ids(session_ids_for_user(user.id))
   end
 
-  def self.session_ids_for_user(user)
+  def self.session_ids_for_user(user_id)
     Gitlab::Redis::SharedState.with do |redis|
-      redis.smembers(lookup_key_name(user.id))
+      redis.smembers(lookup_key_name(user_id))
     end
   end
 
@@ -129,7 +129,7 @@ class ActiveSession
   end
 
   def self.cleaned_up_lookup_entries(redis, user)
-    session_ids = session_ids_for_user(user)
+    session_ids = session_ids_for_user(user.id)
     entries = raw_active_session_entries(session_ids, user.id)
 
     # remove expired keys.

changelogs/unreleased/64257-active_session_lookup_key_cleanup.yml

+---
+title: Rake task to cleanup expired ActiveSession lookup keys
+merge_request: 30668
+author:
+type: performance

doc/raketasks/cleanup.md

@@ -137,3 +137,13 @@ level with `NICENESS`. Below are the valid levels, but consult
 - `1` or `Realtime`
 - `2` or `Best-effort` (default)
 - `3` or `Idle`
+
+## Remove expired ActiveSession lookup keys
+
+```
+# omnibus-gitlab
+sudo gitlab-rake gitlab:cleanup:sessions:active_sessions_lookup_keys
+
+# installation from source
+bundle exec rake gitlab:cleanup:sessions:active_sessions_lookup_keys RAILS_ENV=production
+```

lib/tasks/gitlab/cleanup.rake

@@ -127,6 +127,58 @@ namespace :gitlab do
       end
     end
 
+    namespace :sessions do
+      desc "GitLab | Cleanup | Sessions | Clean ActiveSession lookup keys"
+      task active_sessions_lookup_keys: :gitlab_environment do
+        session_key_pattern = "#{Gitlab::Redis::SharedState::USER_SESSIONS_LOOKUP_NAMESPACE}:*"
+        last_save_check = Time.at(0)
+        wait_time = 10.seconds
+        cursor = 0
+        total_users_scanned = 0
+
+        Gitlab::Redis::SharedState.with do |redis|
+          begin
+            cursor, keys = redis.scan(cursor, match: session_key_pattern)
+            total_users_scanned += keys.count
+
+            if last_save_check < Time.now - 1.second
+              while redis.info('persistence')['rdb_bgsave_in_progress'] == '1'
+                puts "BGSAVE in progress, waiting #{wait_time} seconds"
+                sleep(wait_time)
+              end
+              last_save_check = Time.now
+            end
+
+            keys.each do |key|
+              user_id = key.split(':').last
+
+              lookup_key_count = redis.scard(key)
+
+              session_ids = ActiveSession.session_ids_for_user(user_id)
+              entries = ActiveSession.raw_active_session_entries(session_ids, user_id)
+              session_ids_and_entries = session_ids.zip(entries)
+
+              inactive_session_ids = session_ids_and_entries.map do |session_id, session|
+                session_id if session.nil?
+              end.compact
+
+              redis.pipelined do |conn|
+                inactive_session_ids.each do |session_id|
+                  conn.srem(key, session_id)
+                end
+              end
+
+              if inactive_session_ids
+                puts "deleted #{inactive_session_ids.count} out of #{lookup_key_count} lookup keys for User ##{user_id}"
+              end
+            end
+          end while cursor.to_i != 0
+
+          puts "--- All done! Total number of scanned users: #{total_users_scanned}"
+        end
+      end
+    end
+
     def remove?
       ENV['REMOVE'] == 'true'
     end

spec/models/active_session_spec.rb

@@ -114,7 +114,7 @@ RSpec.describe ActiveSession, :clean_gitlab_redis_shared_state do
         redis.sadd("session:lookup:user:gitlab:#{user.id}", session_ids)
       end
 
-      expect(ActiveSession.session_ids_for_user(user)).to eq(session_ids)
+      expect(ActiveSession.session_ids_for_user(user.id)).to eq(session_ids)
     end
   end
 

spec/tasks/gitlab/cleanup_rake_spec.rb

@@ -185,4 +185,34 @@ describe 'gitlab:cleanup rake tasks' do
       end
     end
   end
+
+  context 'sessions' do
+    describe 'gitlab:cleanup:sessions:active_sessions_lookup_keys', :clean_gitlab_redis_shared_state do
+      subject(:rake_task) { run_rake_task('gitlab:cleanup:sessions:active_sessions_lookup_keys') }
+
+      let!(:user) { create(:user) }
+      let(:existing_session_id) { '5' }
+
+      before do
+        Gitlab::Redis::SharedState.with do |redis|
+          redis.set("session:user:gitlab:#{user.id}:#{existing_session_id}",
+                    Marshal.dump(true))
+          redis.sadd("session:lookup:user:gitlab:#{user.id}", (1..10).to_a)
+        end
+      end
+
+      it 'runs the task without errors' do
+        expect { rake_task }.not_to raise_error
+      end
+
+      it 'removes expired active session lookup keys' do
+        Gitlab::Redis::SharedState.with do |redis|
+          lookup_key = "session:lookup:user:gitlab:#{user.id}"
+          expect { subject }.to change { redis.scard(lookup_key) }.from(10).to(1)
+          expect(redis.smembers("session:lookup:user:gitlab:#{user.id}")).to(
+            eql([existing_session_id]))
+        end
+      end
+    end
+  end
 end