Clear message in case of function/pod failure (#1069)

* Clear message in case of function/pod failure
* Added err handling while getting pods
* Using multierror instead of strings

executor/poolmgr/gp.go

@@ -27,6 +27,7 @@ import (
 	"time"
 
 	"github.com/dchest/uniuri"
+	multierror "github.com/hashicorp/go-multierror"
 	"github.com/pkg/errors"
 	apiv1 "k8s.io/api/core/v1"
 	"k8s.io/api/extensions/v1beta1"
@@ -574,9 +575,25 @@ func (gp *GenericPool) waitForReadyPod() error {
 		}
 
 		if time.Since(startTime) > gp.podReadyTimeout {
+			podList, err := gp.kubernetesClient.CoreV1().Pods(gp.namespace).List(metav1.ListOptions{
+				LabelSelector: labels.Set(
+					gp.deployment.Spec.Selector.MatchLabels).AsSelector().String(),
+			})
+			if err != nil {
+				log.Printf("Error getting pod list after timeout waiting for ready pod: %v", err)
+			}
+
+			// Since even single pod is not ready, choosing the first pod to inspect is a good approximation. In future this can be done better
+			pod := podList.Items[0]
+			var multierr *multierror.Error
+			for _, cStatus := range pod.Status.ContainerStatuses {
+				if cStatus.Ready != true {
+					multierr = multierror.Append(multierr, errors.New(fmt.Sprintf("%v: %v", cStatus.State.Waiting.Reason, cStatus.State.Waiting.Message)))
+				}
+			}
 			return errors.Errorf(
-				"Timeout: waited too long for pod of deployment %v in namespace %v to be ready",
+				"Timeout: waited too long for pod of deployment %v in namespace %v to be ready, error: %v",
-				gp.deployment.ObjectMeta.Name, gp.namespace)
+				gp.deployment.ObjectMeta.Name, gp.namespace, multierr)
 		}
 		time.Sleep(1000 * time.Millisecond)
 	}

fission/function.go

@@ -803,7 +803,7 @@ func fnTest(c *cli.Context) error {
 
 	body, err := ioutil.ReadAll(resp.Body)
 	util.CheckErr(err, "read log response from pod")
-	fmt.Printf("Error calling function %s: %d %s", fnName, resp.StatusCode, string(body))
+	fmt.Printf("Error calling function %s: %d; Please try again or fix the error: %s", fnName, resp.StatusCode, string(body))
 	defer resp.Body.Close()
 	err = printPodLogs(c)
 	if err != nil {