fix: closing the Client also closes the broker

* The error was also previously unhandled. For shared connections an error will be returned by the broker itself because the sharedConnection bool is also set on the client. This also means we can get rid of the sharedConnection flag on the Scheduler itself and let it work internally.

scheduler.go

@@ -44,9 +44,6 @@ type Scheduler struct {
 	// to avoid using cron.EntryID as the public API of
 	// the Scheduler.
 	idmap map[string]cron.EntryID
-	// When a Scheduler has been created with an existing Redis connection, we do
-	// not want to close it.
-	sharedConnection bool
 }
 
 const defaultHeartbeatInterval = 10 * time.Second
@@ -65,7 +62,6 @@ func NewScheduler(r RedisConnOpt, opts *SchedulerOpts) *Scheduler {
 
 	scheduler.rdb = rdb
 	scheduler.client = &Client{broker: rdb, sharedConnection: false}
-	scheduler.sharedConnection = false
 
 	return scheduler
 }
@@ -78,7 +74,6 @@ func NewSchedulerFromRedisClient(c redis.UniversalClient, opts *SchedulerOpts) *
 
 	scheduler.rdb = rdb.NewRDB(c)
 	scheduler.client = NewClientFromRedisClient(c)
-	scheduler.sharedConnection = true
 
 	return scheduler
 }
@@ -309,9 +304,6 @@ func (s *Scheduler) Shutdown() {
 	if err := s.client.Close(); err != nil {
 		s.logger.Errorf("Failed to close redis client connection: %v", err)
 	}
-	if !s.sharedConnection {
-		s.rdb.Close()
-	}
 	s.logger.Info("Scheduler stopped")
 }