backend

type Backend interface {
	// GetKeys returns a list of keys for a given path
	GetKeys(bucket []string) ([]string, error)
	// CreateVal creates value with a given TTL and key in the bucket
	// if the value already exists, it must return trace.AlreadyExistsError
	CreateVal(bucket []string, key string, val []byte, ttl time.Duration) error
	// UpsertVal updates or inserts value with a given TTL into a bucket
	// ForeverTTL for no TTL
	UpsertVal(bucket []string, key string, val []byte, ttl time.Duration) error
	// GetVal return a value for a given key in the bucket
	GetVal(path []string, key string) ([]byte, error)
	// DeleteKey deletes a key in a bucket
	DeleteKey(bucket []string, key string) error
	// DeleteBucket deletes the bucket by a given path
	DeleteBucket(path []string, bkt string) error
	// AcquireLock grabs a lock that will be released automatically in TTL
	AcquireLock(token string, ttl time.Duration) error
	// ReleaseLock forces lock release before TTL
	ReleaseLock(token string) error
	// Close releases the resources taken up by this backend
	Close() error
	// Clock returns clock used by this backend
	Clock() clockwork.Clock
}

type Config struct {
	// Type can be "bolt" or "etcd" or "dynamodb"
	Type string `yaml:"type,omitempty"`

	// Params is a generic key/value property bag which allows arbitrary
	// falues to be passed to backend
	Params Params `yaml:",inline"`
}

type Item struct {
	// Key is an item key
	Key string
	// Value is an item value
	Value []byte
}

type ItemsGetter interface {
	// GetItems returns a list of items - key value pairs
	GetItems(bucket []string) ([]Item, error)
}

type JSONCodec struct {
	Backend
}

type NameFunc func() string

type NewFunc func(Params) (Backend, error)

type Params map[string]interface{}