prysm-pulse/sharding/interfaces.go

package sharding

import (
	cli "gopkg.in/urfave/cli.v1"
)

// Service defines items that can be registered into a sharding client.
//
// life-cycle management is delegated to the sharding client. The service is allowed to
// initialize itself upon creation, but no goroutines should be spun up outside of the
// Start method.
type Service interface {
	// Start is called after all services have been constructed and the networking
	// layer was also initialized to spawn any goroutines required by the service.
	Start() error

	// Stop terminates all goroutines belonging to the service, blocking until they
	// are all terminated.
	Stop() error
}

// ServiceConstructor defines the callback passed in when registering a service
// to a sharding node.
type ServiceConstructor func(ctx *cli.Context) (Service, error)