interfaces

type Application interface {
	AllUnits() ([]Unit, error)
	Constraints() (constraints.Value, error)
	IsPrincipal() bool
}

type BackendModel interface {
	Config() (*config.Config, error)
	ModelTag() names.ModelTag
	Cloud() (cloud.Cloud, error)
	CloudCredential() (state.Credential, bool, error)
	CloudRegion() string
	ControllerUUID() string
	Type() state.ModelType
}

type BackendState interface {
	AddCharmMetadata(state.CharmInfo) (*state.Charm, error)
	AllCharms() ([]*state.Charm, error)
	Application(string) (Application, error)
	Charm(curl *charm.URL) (*state.Charm, error)
	ControllerConfig() (controller.Config, error)
	ControllerTag() names.ControllerTag
	UpdateUploadedCharm(info state.CharmInfo) (services.UploadedCharm, error)
	PrepareCharmUpload(curl *charm.URL) (services.UploadedCharm, error)
	Machine(string) (Machine, error)
	state.MongoSessioner
	ModelUUID() string
	ModelConstraints() (constraints.Value, error)
}

type Downloader interface {
	DownloadAndStore(charmURL *charm.URL, requestedOrigin corecharm.Origin, macaroons macaroon.Slice, force bool) (corecharm.Origin, error)
}

type Machine interface {
	HardwareCharacteristics() (*instance.HardwareCharacteristics, error)
	Constraints() (constraints.Value, error)
}

type Unit interface {
	AssignedMachineId() (string, error)
}