const (
	StorageTypeUnset = ""
	StorageTypeETCD2 = "etcd2"
	StorageTypeETCD3 = "etcd3"

	DefaultCompactInterval      = 5 * time.Minute
	DefaultDBMetricPollInterval = 30 * time.Second
	DefaultEventsHistoryWindow  = 75 * time.Second
	DefaultHealthcheckTimeout   = 2 * time.Second
	DefaultReadinessTimeout     = 2 * time.Second
)

type Config struct {
	// Type defines the type of storage backend. Default ("") is "etcd3".
	Type string
	// Prefix is the prefix to all keys passed to storage.Interface methods.
	Prefix string
	// Transport holds all connection related info, i.e. equal TransportConfig means equal servers we talk to.
	Transport TransportConfig

	Codec runtime.Codec
	// EncodeVersioner is the same groupVersioner used to build the
	// storage encoder. Given a list of kinds the input object might belong
	// to, the EncodeVersioner outputs the gvk the object will be
	// converted to before persisted in etcd.
	EncodeVersioner runtime.GroupVersioner
	// Transformer allows the value to be transformed prior to persisting into etcd.
	Transformer value.Transformer

	// CompactionInterval is an interval of requesting compaction from apiserver.
	// If the value is 0, no compaction will be issued.
	CompactionInterval time.Duration
	// CountMetricPollPeriod specifies how often should count metric be updated
	CountMetricPollPeriod time.Duration
	// DBMetricPollInterval specifies how often should storage backend metric be updated.
	DBMetricPollInterval time.Duration
	// EventsHistoryWindow specifies minimum history duration that storage is keeping.
	EventsHistoryWindow time.Duration
	// HealthcheckTimeout specifies the timeout used when checking health
	HealthcheckTimeout time.Duration
	// ReadycheckTimeout specifies the timeout used when checking readiness
	ReadycheckTimeout time.Duration

	LeaseManagerConfig etcd3.LeaseManagerConfig

	// StorageObjectCountTracker is used to keep track of the total
	// number of objects in the storage per resource.
	StorageObjectCountTracker flowcontrolrequest.StorageObjectCountTracker
}

type ConfigForResource struct {
	// Config is the resource-independent configuration
	Config

	// GroupResource is the relevant one
	GroupResource schema.GroupResource
}

type TransportConfig struct {
	// ServerList is the list of storage servers to connect with.
	ServerList []string
	// TLS credentials
	KeyFile       string
	CertFile      string
	TrustedCAFile string
	// function to determine the egress dialer. (i.e. konnectivity server dialer)
	EgressLookup egressselector.Lookup
	// The TracerProvider can add tracing the connection
	TracerProvider oteltrace.TracerProvider
}