upgradeseries

type AgentService interface {
	Running() (bool, error)
	Start() error
	Stop() error
}

type Config struct {
	// FacadeFactory is used to acquire back-end state with
	// the input tag context.
	FacadeFactory func(names.Tag) Facade

	// Logger is the logger for this worker.
	Logger Logger

	// Tag is the current machine tag.
	Tag names.Tag

	// ServiceAccess provides access to the local init system.
	Service ServiceAccess

	// UpgraderFactory is a factory method that will return an upgrader capable
	// of handling service and agent binary manipulation for a
	// runtime-determined target OS series.
	UpgraderFactory func(string) (Upgrader, error)
}

type Facade interface {
	// Getters
	WatchUpgradeSeriesNotifications() (watcher.NotifyWatcher, error)
	MachineStatus() (model.UpgradeSeriesStatus, error)
	UnitsPrepared() ([]names.UnitTag, error)
	UnitsCompleted() ([]names.UnitTag, error)
	TargetSeries() (string, error)

	// Setters
	StartUnitCompletion(reason string) error
	SetMachineStatus(status model.UpgradeSeriesStatus, reason string) error
	FinishUpgradeSeries(string) error
	PinMachineApplications() (map[string]error, error)
	UnpinMachineApplications() (map[string]error, error)
}

type Logger interface {
	Debugf(message string, args ...interface{})
	Infof(message string, args ...interface{})
	Warningf(message string, args ...interface{})
	Errorf(message string, args ...interface{})
}

type ManifoldConfig struct {
	AgentName     string
	APICallerName string

	Logger    Logger
	NewFacade func(base.APICaller, names.Tag) Facade
	NewWorker func(Config) (worker.Worker, error)
}

type ServiceAccess interface {
	// ListServices returns a slice of service
	// names known by the local init system.
	ListServices() ([]string, error)

	// DiscoverService returns a service implementation
	// based on the input service name and config.
	DiscoverService(string) (AgentService, error)
}

type Upgrader interface {
	PerformUpgrade() error
}