utils: use the ParseDuration function of prometheus model (#163)

go.mod

@@ -9,6 +9,7 @@ require (
 	github.com/google/go-cmp v0.6.0
 	github.com/google/uuid v1.6.0
 	github.com/prometheus/client_golang v1.20.4
+	github.com/prometheus/common v0.59.1
 	go.opentelemetry.io/contrib/propagators/b3 v1.28.0
 	go.opentelemetry.io/otel v1.28.0
 	go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc v1.28.0
@@ -33,7 +34,6 @@ require (
 	github.com/klauspost/compress v1.17.10 // indirect
 	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
 	github.com/prometheus/client_model v0.6.1 // indirect
-	github.com/prometheus/common v0.59.1 // indirect
 	github.com/prometheus/procfs v0.15.1 // indirect
 	go.opentelemetry.io/proto/otlp v1.3.1 // indirect
 	golang.org/x/net v0.29.0 // indirect

utils/decode.go

@@ -10,6 +10,7 @@ import (
 
 	"github.com/go-viper/mapstructure/v2"
 	"github.com/google/uuid"
+	"github.com/prometheus/common/model"
 )
 
 var (
@@ -902,20 +903,20 @@ func DecodeNullableDuration(value any) (*time.Duration, error) {
 	case *time.Duration:
 		result = *v
 	case string:
-		dur, err := time.ParseDuration(v)
+		dur, err := model.ParseDuration(v)
 		if err != nil {
 			return nil, err
 		}
-		result = dur
+		result = time.Duration(dur)
 	case *string:
 		if IsNil(v) {
 			return nil, nil
 		}
-		dur, err := time.ParseDuration(*v)
+		dur, err := model.ParseDuration(*v)
 		if err != nil {
 			return nil, err
 		}
-		result = dur
+		result = time.Duration(dur)
 	default:
 		i64, err := DecodeNullableInt[int64](v)
 		if err != nil {

utils/decode_test.go

@@ -324,10 +324,10 @@ func TestDecodeDuration(t *testing.T) {
 
 		invalidStr := "test"
 		_, err = DecodeDuration(invalidStr)
-		assert.ErrorContains(t, err, "time: invalid duration \"test\"")
+		assert.ErrorContains(t, err, "not a valid duration string: \"test\"")
 
 		_, err = DecodeDuration(&invalidStr)
-		assert.ErrorContains(t, err, "time: invalid duration \"test\"")
+		assert.ErrorContains(t, err, "not a valid duration string: \"test\"")
 
 		var nilStr *string
 		nilValue, err := DecodeNullableDuration(nilStr)