Пример #1
0
// processMachine retrieves version and status information for the given machine.
// It also returns deprecated legacy status information.
func processMachine(machine *state.Machine) (out params.AgentStatus, compat params.AgentStatus) {
	out.Life = processLife(machine)

	if t, err := machine.AgentTools(); err == nil {
		out.Version = t.Version.Number.String()
	}

	populateStatusFromGetter(&out, machine)
	compat = out

	if out.Err != nil {
		return
	}
	if out.Status == params.StatusPending {
		// The status is pending - there's no point
		// in enquiring about the agent liveness.
		return
	}
	agentAlive, err := machine.AgentPresence()
	if err != nil {
		return
	}

	if machine.Life() != state.Dead && !agentAlive {
		// The agent *should* be alive but is not. Set status to
		// StatusDown and munge Info to indicate the previous status and
		// info. This is unfortunately making presentation decisions
		// on behalf of the client (crappy).
		//
		// This is munging is only being left in place for
		// compatibility with older clients.  TODO: At some point we
		// should change this so that Info left alone. API version may
		// help here.
		//
		// Better yet, Status shouldn't be changed here in the API at
		// all! Status changes should only happen in State. One
		// problem caused by this is that this status change won't be
		// seen by clients using a watcher because it didn't happen in
		// State.
		if out.Info != "" {
			compat.Info = fmt.Sprintf("(%s: %s)", out.Status, out.Info)
		} else {
			compat.Info = fmt.Sprintf("(%s)", out.Status)
		}
		compat.Status = params.StatusDown
	}

	return
}