internal

type ConnPool interface {
	// Conn returns a ClientConn from the pool.
	//
	// Conns aren't returned to the pool.
	Conn() *grpc.ClientConn

	// Num returns the number of connections in the pool.
	//
	// It will always return the same value.
	Num() int

	// Close closes every ClientConn in the pool.
	//
	// The error returned by Close may be a single error or multiple errors.
	Close() error

	// ConnPool implements grpc.ClientConnInterface to enable it to be used directly with generated proto stubs.
	grpc.ClientConnInterface
}

type DialSettings struct {
	Endpoint                      string
	DefaultEndpoint               string
	DefaultEndpointTemplate       string
	DefaultMTLSEndpoint           string
	Scopes                        []string
	DefaultScopes                 []string
	EnableJwtWithScope            bool
	TokenSource                   oauth2.TokenSource
	Credentials                   *google.Credentials
	CredentialsFile               string // if set, Token Source is ignored.
	CredentialsJSON               []byte
	InternalCredentials           *google.Credentials
	UserAgent                     string
	APIKey                        string
	Audiences                     []string
	DefaultAudience               string
	HTTPClient                    *http.Client
	GRPCDialOpts                  []grpc.DialOption
	GRPCConn                      *grpc.ClientConn
	GRPCConnPool                  ConnPool
	GRPCConnPoolSize              int
	NoAuth                        bool
	TelemetryDisabled             bool
	ClientCertSource              func(*tls.CertificateRequestInfo) (*tls.Certificate, error)
	CustomClaims                  map[string]interface{}
	SkipValidation                bool
	ImpersonationConfig           *impersonate.Config
	EnableDirectPath              bool
	EnableDirectPathXds           bool
	AllowNonDefaultServiceAccount bool
	DefaultUniverseDomain         string
	UniverseDomain                string
	AllowHardBoundTokens          []string
	Logger                        *slog.Logger
	// Google API system parameters. For more information please read:
	// https://cloud.google.com/apis/docs/system-parameters
	QuotaProject  string
	RequestReason string

	// New Auth library Options
	AuthCredentials      *auth.Credentials
	EnableNewAuthLibrary bool

	// TODO(b/372244283): Remove after b/358175516 has been fixed
	EnableAsyncRefreshDryRun func()
}