engine

type Engine interface {
	// GetFeatureFlags returns list of features or an empty list otherwise.
	GetFeatureFlags() ([]FeatureFlag, error)
	// GetFeatureFlag returns an specific feature or engine.NotFoundError when it's not found.
	GetFeatureFlag(FeatureFlagKey) (*FeatureFlag, error)
	// UpsertFeatureFlag updates or inserts the feature flag.
	UpsertFeatureFlag(FeatureFlag) error
	// DeleteFeatureFlag deletes an specific feature flag or returns engine.NotFoundError when it's not found.
	DeleteFeatureFlag(FeatureFlagKey) error
}

type FeatureFlag struct {
	Enabled    bool    `json:"enabled"`
	Key        string  `json:"key"`
	Users      []*User `json:"users,omitempty"`
	Percentage uint32  `json:"percentage"`
}

type FeatureFlagKey struct {
	Key string
}

type NotFoundError struct {
	Message string
}

type User struct {
	Id string `json:"id"`
}