Function hasJSONRPCIDFieldRec

expr/http_endpoint.go:1194–1230

hasJSONRPCIDFieldRec walks the attribute graph looking for the jsonrpc:id meta while guarding against cycles that may occur with recursive user types.

(attr *AttributeExpr, seen map[*AttributeExpr]struct{}, seenUT map[string]struct{})

// hasJSONRPCIDFieldRec walks the attribute graph looking for the jsonrpc:id meta
// while guarding against cycles that may occur with recursive user types.
func hasJSONRPCIDFieldRec(attr *AttributeExpr, seen map[*AttributeExpr]struct{}, seenUT map[string]struct{}) bool {
	if attr == nil || attr.Type == Empty {
		return false
	}
	if _, ok := seen[attr]; ok {
		return false
	}
	seen[attr] = struct{}{}

	// Check if this attribute itself has the jsonrpc:id meta tag
	if attr.Meta != nil {
		if _, hasID := attr.Meta["jsonrpc:id"]; hasID {
			return true
		}
	}

	// For object types, check all nested attributes
	if obj := AsObject(attr.Type); obj != nil {
		for _, nat := range *obj {
			if hasJSONRPCIDFieldRec(nat.Attribute, seen, seenUT) {
				return true
			}
		}
	}

	// For user types, check the underlying attribute (guarding for recursion)
	if ut, ok := attr.Type.(UserType); ok {
		if ut != nil {
			if _, ok := seenUT[ut.ID()]; ok {
				return false
			}
			seenUT[ut.ID()] = struct{}{}
			return hasJSONRPCIDFieldRec(ut.Attribute(), seen, seenUT)
		}
	}
	return false
}