support $INPUT_REMAP_FILE

src/device/input/input.go

@@ -12,7 +12,7 @@ type Input interface {
 
 func New(ctx context.Context) Input {
 	foo := randomCharFromRange('a', 'g')
-	if p, ok := os.LookupEnv("INPUT_RANDOM_WEIGHT_FILE"); ok {
+	if p, ok := os.LookupEnv("INPUT_RANDOM_WEIGHT_FILE"); ok && len(p) > 0 {
 		foo = randomCharFromWeightFile(p)
 	}
 	var result Input = NewRandom(foo)
@@ -22,5 +22,8 @@ func New(ctx context.Context) Input {
 	if os.Getenv("INPUT_BUFFERED") == "true" {
 		result = NewBuffered(ctx, result)
 	}
+	if p, ok := os.LookupEnv("INPUT_REMAP_FILE"); ok && len(p) > 0 {
+		result = NewRemapFromFile(result, p)
+	}
 	return result
 }