Simplify queue error handling

Don't log errors to Sentry.
Reduce helpers usage in favor of simple http error

internal/helper/helpers.go

@@ -28,18 +28,6 @@ func LogError(r *http.Request, err error) {
 	printError(r, err)
 }
 
-func ServiceUnavailable(w http.ResponseWriter, r *http.Request, err error) {
-	http.Error(w, "Service Unavailable", http.StatusServiceUnavailable)
-	captureRavenError(r, err)
-	printError(r, err)
-}
-
-func TooManyRequests(w http.ResponseWriter, r *http.Request, err error) {
-	http.Error(w, "Too Many Requests", 429) // http.StatusTooManyRequests was added in go1.6
-	captureRavenError(r, err)
-	printError(r, err)
-}
-
 func RequestEntityTooLarge(w http.ResponseWriter, r *http.Request, err error) {
 	http.Error(w, "Request Entity Too Large", http.StatusRequestEntityTooLarge)
 	captureRavenError(r, err)

internal/queueing/requests.go

@@ -7,7 +7,10 @@ import (
 	"gitlab.com/gitlab-org/gitlab-workhorse/internal/helper"
 )
 
-const DefaultTimeout = 30 * time.Second
+const (
+	DefaultTimeout            = 30 * time.Second
+	httpStatusTooManyRequests = 429
+)
 
 // QueueRequests creates a new request queue
 // name specifies the name of queue, used to label Prometheus metrics
@@ -35,10 +38,10 @@ func QueueRequests(name string, h http.Handler, limit, queueLimit uint, queueTim
 			h.ServeHTTP(w, r)
 
 		case ErrTooManyRequests:
-			helper.TooManyRequests(w, r, err)
+			http.Error(w, "Too Many Requests", httpStatusTooManyRequests)
 
 		case ErrQueueingTimedout:
-			helper.ServiceUnavailable(w, r, err)
+			http.Error(w, "Service Unavailable", http.StatusServiceUnavailable)
 
 		default:
 			helper.Fail500(w, r, err)