fix: don't load entire archived workflow into memory in list APIs

persist/sqldb/workflow_archive.go

@@ -8,7 +8,9 @@ import (
 	log "github.com/sirupsen/logrus"
 	"github.com/upper/db/v4"
 	"google.golang.org/grpc/codes"
+	v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/labels"
+	"k8s.io/apimachinery/pkg/types"
 
 	wfv1 "github.com/argoproj/argo-workflows/v3/pkg/apis/workflow/v1alpha1"
 	sutils "github.com/argoproj/argo-workflows/v3/server/utils"
@@ -30,6 +32,9 @@ type archivedWorkflowMetadata struct {
 	Phase       wfv1.WorkflowPhase `db:"phase"`
 	StartedAt   time.Time          `db:"startedat"`
 	FinishedAt  time.Time          `db:"finishedat"`
+	Labels      string             `db:"labels,omitempty"`
+	Annotations string             `db:"annotations,omitempty"`
+	Progress    string             `db:"progress,omitempty"`
 }
 
 type archivedWorkflowRecord struct {
@@ -142,7 +147,7 @@ func (r *workflowArchive) ArchiveWorkflow(wf *wfv1.Workflow) error {
 }
 
 func (r *workflowArchive) ListWorkflows(namespace string, name string, namePrefix string, minStartedAt, maxStartedAt time.Time, labelRequirements labels.Requirements, limit int, offset int) (wfv1.Workflows, error) {
-	var archivedWfs []archivedWorkflowRecord
+	var archivedWfs []archivedWorkflowMetadata
 
 	// If we were passed 0 as the limit, then we should load all available archived workflows
 	// to match the behavior of the `List` operations in the Kubernetes API
@@ -151,8 +156,13 @@ func (r *workflowArchive) ListWorkflows(namespace string, name string, namePrefi
 		offset = -1
 	}
 
+	selectQuery, err := selectArchivedWorkflowQuery(r.dbType)
+	if err != nil {
+		return nil, err
+	}
+
 	selector := r.session.SQL().
-		Select("workflow").
+		Select(selectQuery).
 		From(archiveTableName).
 		Where(r.clusterManagedNamespaceAndInstanceID()).
 		And(namespaceEqual(namespace)).
@@ -161,7 +171,7 @@ func (r *workflowArchive) ListWorkflows(namespace string, name string, namePrefi
 		And(startedAtFromClause(minStartedAt)).
 		And(startedAtToClause(maxStartedAt))
 
-	selector, err := labelsClause(selector, r.dbType, labelRequirements)
+	selector, err = labelsClause(selector, r.dbType, labelRequirements)
 	if err != nil {
 		return nil, err
 	}
@@ -174,16 +184,35 @@ func (r *workflowArchive) ListWorkflows(namespace string, name string, namePrefi
 		return nil, err
 	}
 
-	wfs := make(wfv1.Workflows, 0)
-	for _, archivedWf := range archivedWfs {
-		wf := wfv1.Workflow{}
-		err = json.Unmarshal([]byte(archivedWf.Workflow), &wf)
-		if err != nil {
-			log.WithFields(log.Fields{"workflowUID": archivedWf.UID, "workflowName": archivedWf.Name}).Errorln("unable to unmarshal workflow from database")
-		} else {
-			// For backward compatibility, we should label workflow retrieved from DB as Persisted.
-			wf.ObjectMeta.Labels[common.LabelKeyWorkflowArchivingStatus] = "Persisted"
-			wfs = append(wfs, wf)
+	wfs := make(wfv1.Workflows, len(archivedWfs))
+	for i, md := range archivedWfs {
+		labels := make(map[string]string)
+		if err := json.Unmarshal([]byte(md.Labels), &labels); err != nil {
+			return nil, err
+		}
+		// For backward compatibility, we should label workflow retrieved from DB as Persisted.
+		labels[common.LabelKeyWorkflowArchivingStatus] = "Persisted"
+
+		annotations := make(map[string]string)
+		if err := json.Unmarshal([]byte(md.Annotations), &annotations); err != nil {
+			return nil, err
+		}
+
+		wfs[i] = wfv1.Workflow{
+			ObjectMeta: v1.ObjectMeta{
+				Name:              md.Name,
+				Namespace:         md.Namespace,
+				UID:               types.UID(md.UID),
+				CreationTimestamp: v1.Time{Time: md.StartedAt},
+				Labels:            labels,
+				Annotations:       annotations,
+			},
+			Status: wfv1.WorkflowStatus{
+				Phase:      md.Phase,
+				StartedAt:  v1.Time{Time: md.StartedAt},
+				FinishedAt: v1.Time{Time: md.FinishedAt},
+				Progress:   wfv1.Progress(md.Progress),
+			},
 		}
 	}
 	return wfs, nil
@@ -347,3 +376,13 @@ func (r *workflowArchive) DeleteExpiredWorkflows(ttl time.Duration) error {
 	log.WithFields(log.Fields{"rowsAffected": rowsAffected}).Info("Deleted archived workflows")
 	return nil
 }
+
+func selectArchivedWorkflowQuery(t dbType) (*db.RawExpr, error) {
+	switch t {
+	case MySQL:
+		return db.Raw("name, namespace, uid, phase, startedat, finishedat, coalesce(workflow->>'$.metadata.labels', '{}') as labels,coalesce(workflow->>'$.metadata.annotations', '{}') as annotations, coalesce(workflow->>'$.status.progress', '') as progress"), nil
+	case Postgres:
+		return db.Raw("name, namespace, uid, phase, startedat, finishedat, coalesce((workflow::json)->'metadata'->>'labels', '{}') as labels, coalesce((workflow::json)->'metadata'->>'annotations', '{}') as annotations, coalesce((workflow::json)->'status'->>'progress', '') as progress"), nil
+	}
+	return nil, fmt.Errorf("unsupported db type %s", t)
+}