loaders

type Initializer func() TargetLoader

type Option func(TargetLoader)

type TargetLoader interface {
	// Init initializes the target loader given the config, logger and options
	Init(ctx context.Context, cfg map[string]interface{}, l *log.Logger, opts ...Option) error
	// RunOnce runs the loader only once, returning a map of target configs
	RunOnce(ctx context.Context) (map[string]*types.TargetConfig, error)
	// Start starts the target loader, running periodic polls or a long watch.
	// It returns a channel of TargetOperation from which the function caller can
	// receive the added/removed target configs
	Start(context.Context) chan *TargetOperation
	// RegsiterMetrics registers the loader metrics with the provided registry
	RegisterMetrics(*prometheus.Registry)
	// WithActions passes the actions configuration to the target loader
	WithActions(map[string]map[string]interface{})
	// WithTargetsDefaults passes a callback function that sets the target config defaults
	WithTargetsDefaults(func(tc *types.TargetConfig) error)
}

type TargetOperation struct {
	Add map[string]*types.TargetConfig
	Del []string
}