logs should return for non existent services (#1906)

runtime/kubernetes/kubernetes.go

@@ -364,6 +364,7 @@ func (k *kubernetes) Logs(s *runtime.Service, options ...runtime.LogsOption) (ru
 			for _, record := range records {
 				kstream.Chan() <- record
 			}
+			kstream.Stop()
 		}()
 		return kstream, nil
 	}

runtime/kubernetes/logs.go

@@ -9,6 +9,7 @@ import (
 	"strconv"
 	"time"
 
+	"github.com/micro/go-micro/v3/errors"
 	"github.com/micro/go-micro/v3/runtime"
 	"github.com/micro/go-micro/v3/util/kubernetes/client"
 	"github.com/micro/go-micro/v3/util/log"
@@ -105,6 +106,9 @@ func (k *klog) Read() ([]runtime.LogRecord, error) {
 	if err != nil {
 		return nil, err
 	}
+	if len(pods) == 0 {
+		return nil, errors.NotFound("runtime.logs", "no such service")
+	}
 
 	var records []runtime.LogRecord