Return error if queue name is empty when enqueueing

client.go

@@ -115,7 +115,11 @@ type option struct {
 	uniqueTTL time.Duration
 }
 
-func composeOptions(opts ...Option) option {
+// composeOptions merges user provided options into the default options
+// and returns the composed option.
+// It also validates the user provided options and returns an error if any of
+// the user provided options fail the validations.
+func composeOptions(opts ...Option) (option, error) {
 	res := option{
 		retry:    defaultMaxRetry,
 		queue:    base.DefaultQueueName,
@@ -127,7 +131,11 @@ func composeOptions(opts ...Option) option {
 		case retryOption:
 			res.retry = int(opt)
 		case queueOption:
-			res.queue = string(opt)
+			trimmed := strings.TrimSpace(string(opt))
+			if len(trimmed) == 0 {
+				return option{}, fmt.Errorf("queue name must contain one or more characters")
+			}
+			res.queue = trimmed
 		case timeoutOption:
 			res.timeout = time.Duration(opt)
 		case deadlineOption:
@@ -138,7 +146,7 @@ func composeOptions(opts ...Option) option {
 			// ignore unexpected option
 		}
 	}
-	return res
+	return res, nil
 }
 
 const (
@@ -239,7 +247,10 @@ func (c *Client) enqueueAt(t time.Time, task *Task, opts ...Option) (*Result, er
 	if defaults, ok := c.opts[task.Type]; ok {
 		opts = append(defaults, opts...)
 	}
-	opt := composeOptions(opts...)
+	opt, err := composeOptions(opts...)
+	if err != nil {
+		return nil, err
+	}
 	deadline := noDeadline
 	if !opt.deadline.IsZero() {
 		deadline = opt.deadline
@@ -266,7 +277,6 @@ func (c *Client) enqueueAt(t time.Time, task *Task, opts ...Option) (*Result, er
 		Timeout:   int64(timeout.Seconds()),
 		UniqueKey: uniqueKey,
 	}
-	var err error
 	now := time.Now()
 	if t.Before(now) || t.Equal(now) {
 		err = c.enqueue(msg, opt.uniqueTTL)

client_test.go

@@ -463,6 +463,36 @@ func TestClientEnqueueIn(t *testing.T) {
 	}
 }
 
+func TestClientEnqueueError(t *testing.T) {
+	r := setup(t)
+	client := NewClient(getRedisConnOpt(t))
+
+	task := NewTask("send_email", map[string]interface{}{"to": "customer@gmail.com", "from": "merchant@example.com"})
+
+	tests := []struct {
+		desc string
+		task *Task
+		opts []Option
+	}{
+		{
+			desc: "With empty queue name",
+			task: task,
+			opts: []Option{
+				Queue(""),
+			},
+		},
+	}
+
+	for _, tc := range tests {
+		h.FlushDB(t, r)
+
+		_, err := client.Enqueue(tc.task, tc.opts...)
+		if err == nil {
+			t.Errorf("%s; client.Enqueue(task, opts...) did not return non-nil error", tc.desc)
+		}
+	}
+}
+
 func TestClientDefaultOptions(t *testing.T) {
 	r := setup(t)