Use proto file name to infer message type

cmd/register/register_util.go

@@ -92,37 +92,74 @@ var projectColumns = []printer.Column{
 	{Header: "Additional Info", JSONPath: "$.Info"},
 }
 
+// Regex to match file name like xxx_1.pb, xxx_2.pb, or xxx_3.pb, and the subgroup catches the number 1, 2 or 3
+// This is used to match proto files created by pyflyte, where xxx_1.pb is a task spec, xxx_2.pb is a workflow spec, and xxx_3.pb is launch plan
+var fnameRegex = regexp.MustCompile(`^.*_(?P<index>[1-3])\.pb$`)
+
+type unMarshalFunc = func(ctx context.Context, fileContents []byte, fname string, errCollection errors2.ErrorCollection) (proto.Message, error)
+
+// Order matters here
+var unMarshalFuncs = []unMarshalFunc{
+	unMarshalTask,
+	unMarshalWorkflow,
+	unMarshalLaunchPlan,
+}
+
 func UnMarshalContents(ctx context.Context, fileContents []byte, fname string) (proto.Message, error) {
-	workflowSpec := &admin.WorkflowSpec{}
 	errCollection := errors2.ErrorCollection{}
-	err := proto.Unmarshal(fileContents, workflowSpec)
-	if err == nil {
-		return workflowSpec, nil
+
+	for _, f := range reorderUnMarshalFuncs(fname) {
+		if m, err := f(ctx, fileContents, fname, errCollection); err == nil {
+			return m, nil
+		}
 	}
 
-	errCollection.Append(fmt.Errorf("as a Workflow: %w", err))
+	return nil, fmt.Errorf("failed unmarshalling file %v. Errors: %w", fname, errCollection.ErrorOrDefault())
+}
 
-	logger.Debugf(ctx, "Failed to unmarshal file %v for workflow type", fname)
-	taskSpec := &admin.TaskSpec{}
-	err = proto.Unmarshal(fileContents, taskSpec)
-	if err == nil {
-		return taskSpec, nil
-	}
+func unMarshalTask(ctx context.Context, fileContents []byte, fname string, errCollection errors2.ErrorCollection) (proto.Message, error) {
+	return unMarshal(ctx, fileContents, fname, errCollection, "Task", "task", &admin.TaskSpec{})
+}
 
-	errCollection.Append(fmt.Errorf("as a Task: %w", err))
+func unMarshalWorkflow(ctx context.Context, fileContents []byte, fname string, errCollection errors2.ErrorCollection) (proto.Message, error) {
+	return unMarshal(ctx, fileContents, fname, errCollection, "Workflow", "workflow", &admin.WorkflowSpec{})
+}
+
+func unMarshalLaunchPlan(ctx context.Context, fileContents []byte, fname string, errCollection errors2.ErrorCollection) (proto.Message, error) {
+	return unMarshal(ctx, fileContents, fname, errCollection, "Launchplan", "launch plan", &admin.LaunchPlan{})
+}
 
-	logger.Debugf(ctx, "Failed to unmarshal file %v for task type", fname)
-	launchPlan := &admin.LaunchPlan{}
-	err = proto.Unmarshal(fileContents, launchPlan)
+func unMarshal(ctx context.Context, fileContents []byte, fname string, errCollection errors2.ErrorCollection, tpe string, typeAlt string, m proto.Message) (proto.Message, error) {
+	err := proto.Unmarshal(fileContents, m)
 	if err == nil {
-		return launchPlan, nil
+		return m, nil
 	}
 
-	errCollection.Append(fmt.Errorf("as a Launchplan: %w", err))
+	errCollection.Append(fmt.Errorf("as a %s type: %w", tpe, err))
+	logger.Debugf(ctx, "Failed to unmarshal file %s for %v type", fname, typeAlt)
+	return nil, err
+}
 
-	logger.Debugf(ctx, "Failed to unmarshal file %v for launch plan type", fname)
-	return nil, fmt.Errorf("failed unmarshalling file %v. Errors: %w", fname, errCollection.ErrorOrDefault())
+func reorderUnMarshalFuncs(fname string) []unMarshalFunc {
+	if match := fnameRegex.FindStringSubmatch(fname); match != nil {
+		indexStr := match[fnameRegex.SubexpIndex("index")]
+		index, err := strconv.Atoi(indexStr)
+		if err != nil {
+			panic(fmt.Sprintf("unexpected error when coverting [%s] to int, file name [%s]", indexStr, fname))
+		}
+
+		var reordered []unMarshalFunc
+		for i, f := range unMarshalFuncs {
+			if i == index-1 {
+				reordered = append([]unMarshalFunc{f}, reordered...)
+			} else {
+				reordered = append(reordered, f)
+			}
+		}
+		return reordered
+	}
 
+	return unMarshalFuncs
 }
 
 func register(ctx context.Context, message proto.Message, cmdCtx cmdCore.CommandContext, dryRun, enableSchedule bool) error {