feat: Support disable retrieval of label values for certain keys

docs/environment-variables.md

@@ -148,9 +148,10 @@ data:
 
 ## Argo Server
 
-| Name                    | Type     | Default | Description                                                                                                                  |
-|-------------------------|----------|---------|------------------------------------------------------------------------------------------------------------------------------|
-| `FIRST_TIME_USER_MODAL` | `bool`   | `true`  | Show this modal.                                                                                                             |
-| `FEEDBACK_MODAL`        | `bool`   | `true`  | Show this modal.                                                                                                             |
-| `NEW_VERSION_MODAL`     | `bool`   | `true`  | Show this modal.                                                                                                             |
-| `POD_NAMES`             | `string` | `v2`    | Whether to have pod names contain the template name (v2) or be the node id (v1) - should be set the same for Controller      |
+| Name                                       | Type     | Default | Description                                                                                                             |
+|--------------------------------------------|----------|---------|-------------------------------------------------------------------------------------------------------------------------|
+| `DISABLE_VALUE_LIST_RETRIEVAL_KEY_PATTERN` | `string` | `""`    | Disable the retrieval of the list of label values for keys based on this regular expression.                            |
+| `FIRST_TIME_USER_MODAL`                    | `bool`   | `true`  | Show this modal.                                                                                                        |
+| `FEEDBACK_MODAL`                           | `bool`   | `true`  | Show this modal.                                                                                                        |
+| `NEW_VERSION_MODAL`                        | `bool`   | `true`  | Show this modal.                                                                                                        |
+| `POD_NAMES`                                | `string` | `v2`    | Whether to have pod names contain the template name (v2) or be the node id (v1) - should be set the same for Controller |

server/workflowarchive/archived_workflow_server.go

@@ -3,6 +3,8 @@ package workflowarchive
 import (
 	"context"
 	"fmt"
+	"os"
+	"regexp"
 	"sort"
 	"strconv"
 	"strings"
@@ -24,6 +26,8 @@ import (
 	"github.com/argoproj/argo-workflows/v3/workflow/util"
 )
 
+const disableValueListRetrievalKeyPattern = "DISABLE_VALUE_LIST_RETRIEVAL_KEY_PATTERN"
+
 type archivedWorkflowServer struct {
 	wfArchive sqldb.WorkflowArchive
 }
@@ -184,6 +188,15 @@ func (w *archivedWorkflowServer) ListArchivedWorkflowLabelKeys(ctx context.Conte
 	return labelkeys, nil
 }
 
+func matchLabelKeyPattern(key string) bool {
+	pattern, _ := os.LookupEnv(disableValueListRetrievalKeyPattern)
+	if pattern == "" {
+		return false
+	}
+	match, _ := regexp.MatchString(pattern, key)
+	return match
+}
+
 func (w *archivedWorkflowServer) ListArchivedWorkflowLabelValues(ctx context.Context, req *workflowarchivepkg.ListArchivedWorkflowLabelValuesRequest) (*wfv1.LabelValues, error) {
 	options := req.ListOptions
 
@@ -202,6 +215,10 @@ func (w *archivedWorkflowServer) ListArchivedWorkflowLabelValues(ctx context.Con
 	} else {
 		return nil, fmt.Errorf("operation %v is not supported", requirement.Operator())
 	}
+	if matchLabelKeyPattern(key) {
+		log.WithFields(log.Fields{"labelKey": key}).Info("Skipping retrieving the list of values for label key")
+		return &wfv1.LabelValues{Items: []string{}}, nil
+	}
 
 	labels, err := w.wfArchive.ListWorkflowsLabelValues(key)
 	if err != nil {

server/workflowarchive/archived_workflow_server_test.go

@@ -2,6 +2,7 @@ package workflowarchive
 
 import (
 	"context"
+	"os"
 	"testing"
 	"time"
 
@@ -190,6 +191,15 @@ func Test_archivedWorkflowServer(t *testing.T) {
 		resp, err := w.ListArchivedWorkflowLabelValues(ctx, &workflowarchivepkg.ListArchivedWorkflowLabelValuesRequest{ListOptions: &metav1.ListOptions{LabelSelector: "my-key"}})
 		assert.NoError(t, err)
 		assert.Len(t, resp.Items, 2)
+
+		assert.False(t, matchLabelKeyPattern("my-key"))
+		_ = os.Setenv(disableValueListRetrievalKeyPattern, "my-key")
+		assert.True(t, matchLabelKeyPattern("my-key"))
+		assert.False(t, matchLabelKeyPattern("wrong key"))
+		resp, err = w.ListArchivedWorkflowLabelValues(ctx, &workflowarchivepkg.ListArchivedWorkflowLabelValuesRequest{ListOptions: &metav1.ListOptions{LabelSelector: "my-key"}})
+		assert.NoError(t, err)
+		assert.Len(t, resp.Items, 0)
+		_ = os.Unsetenv(disableValueListRetrievalKeyPattern)
 	})
 	t.Run("RetryArchivedWorkflow", func(t *testing.T) {
 		_, err := w.RetryArchivedWorkflow(ctx, &workflowarchivepkg.RetryArchivedWorkflowRequest{Uid: "failed-uid"})