fix: Add workflow failures before hooks run. Fixes #8882

USERS.md

@@ -83,6 +83,7 @@ Currently, the following organizations are **officially** using Argo Workflows:
 1. [H2O.ai](https://h2o.ai/)
 1. [Habx](https://www.habx.com/)
 1. [Helio](https://helio.exchange)
+1. [Hemisphere Digital](https://hemisphere.digital)
 1. [HOVER](https://hover.to)
 1. [HSBC](https://hsbc.com)
 1. [IBM](https://ibm.com)

workflow/controller/hooks_test.go

@@ -6,8 +6,10 @@ import (
 	"testing"
 
 	"github.com/stretchr/testify/assert"
+	apiv1 "k8s.io/api/core/v1"
 
 	wfv1 "github.com/argoproj/argo-workflows/v3/pkg/apis/workflow/v1alpha1"
+	"github.com/argoproj/argo-workflows/v3/workflow/common"
 )
 
 func TestExecuteWfLifeCycleHook(t *testing.T) {
@@ -324,7 +326,7 @@ spec:
     parameters:
     - name: message
       value: test
-  entrypoint: main	
+  entrypoint: main
   workflowTemplateRef:
     name: workflow-template-whalesay-template
 status:
@@ -932,3 +934,56 @@ status:
 	node := woc.wf.Status.Nodes.FindByDisplayName("lifecycle-hook-fh7t4.hooks.Failed")
 	assert.NotNil(t, node)
 }
+
+func TestWfHookHasFailures(t *testing.T) {
+	wf := wfv1.MustUnmarshalWorkflow(`
+apiVersion: argoproj.io/v1alpha1
+kind: Workflow
+metadata:
+  name: hook-failures
+  namespace: argo
+spec:
+  entrypoint: intentional-fail
+  hooks:
+    failure:
+      expression: workflow.status == "Failed"
+      template: message
+      arguments:
+        parameters:
+          - name: message
+            value: |
+              Workflow {{ workflow.name }} {{ workflow.status }} {{ workflow.failures }}
+  templates:
+    - name: intentional-fail
+      container:
+        image: alpine:latest
+        command: [sh, -c]
+        args: ["echo intentional failure; exit 1"]
+    - name: message
+      inputs:
+        parameters:
+          - name: message
+      script:
+        image: alpine:latest
+        command: [sh]
+        source: |
+          echo {{ inputs.parameters.message }}
+`)
+
+	cancel, controller := newController(wf)
+	defer cancel()
+
+	ctx := context.Background()
+	woc := newWorkflowOperationCtx(wf, controller)
+	woc.operate(ctx)
+	makePodsPhase(ctx, woc, apiv1.PodFailed)
+
+	woc = newWorkflowOperationCtx(woc.wf, controller)
+	woc.operate(ctx)
+	node := woc.wf.Status.Nodes.FindByDisplayName("hook-failures.hooks.failure")
+	assert.NotNil(t, node)
+	assert.Contains(t,
+		woc.globalParams[common.GlobalVarWorkflowFailures],
+		`[{\"displayName\":\"hook-failures\",\"message\":\"Pod failed\",\"templateName\":\"intentional-fail\",\"phase\":\"Failed\",\"podName\":\"hook-failures\"`,
+	)
+}

workflow/controller/operator.go

@@ -367,6 +367,28 @@ func (woc *wfOperationCtx) operate(ctx context.Context) {
 
 	woc.globalParams[common.GlobalVarWorkflowStatus] = string(workflowStatus)
 
+	var failures []failedNodeStatus
+	for _, node := range woc.wf.Status.Nodes {
+		if node.Phase == wfv1.NodeFailed || node.Phase == wfv1.NodeError {
+			failures = append(failures,
+				failedNodeStatus{
+					DisplayName:  node.DisplayName,
+					Message:      node.Message,
+					TemplateName: node.TemplateName,
+					Phase:        string(node.Phase),
+					PodName:      node.ID,
+					FinishedAt:   node.FinishedAt,
+				})
+		}
+	}
+	failedNodeBytes, err := json.Marshal(failures)
+	if err != nil {
+		woc.log.Errorf("Error marshalling failed nodes list: %+v", err)
+		// No need to return here
+	}
+	// This strconv.Quote is necessary so that the escaped quotes are not removed during parameter substitution
+	woc.globalParams[common.GlobalVarWorkflowFailures] = strconv.Quote(string(failedNodeBytes))
+
 	err = woc.executeWfLifeCycleHook(ctx, tmplCtx)
 	if err != nil {
 		woc.markNodeError(node.Name, err)
@@ -381,28 +403,6 @@ func (woc *wfOperationCtx) operate(ctx context.Context) {
 
 	var onExitNode *wfv1.NodeStatus
 	if woc.execWf.Spec.HasExitHook() && woc.GetShutdownStrategy().ShouldExecute(true) {
-		var failures []failedNodeStatus
-		for _, node := range woc.wf.Status.Nodes {
-			if node.Phase == wfv1.NodeFailed || node.Phase == wfv1.NodeError {
-				failures = append(failures,
-					failedNodeStatus{
-						DisplayName:  node.DisplayName,
-						Message:      node.Message,
-						TemplateName: node.TemplateName,
-						Phase:        string(node.Phase),
-						PodName:      node.ID,
-						FinishedAt:   node.FinishedAt,
-					})
-			}
-		}
-		failedNodeBytes, err := json.Marshal(failures)
-		if err != nil {
-			woc.log.Errorf("Error marshalling failed nodes list: %+v", err)
-			// No need to return here
-		}
-		// This strconv.Quote is necessary so that the escaped quotes are not removed during parameter substitution
-		woc.globalParams[common.GlobalVarWorkflowFailures] = strconv.Quote(string(failedNodeBytes))
-
 		woc.log.Infof("Running OnExit handler: %s", woc.execWf.Spec.OnExit)
 		onExitNodeName := common.GenerateOnExitNodeName(woc.wf.ObjectMeta.Name)
 		exitHook := woc.execWf.Spec.GetExitHook(woc.execWf.Spec.Arguments)