コード例 #1
0
ファイル: deploy.go プロジェクト: pmatulis/juju
// AddUnits starts n units of the given service using the specified placement
// directives to allocate the machines.
func AddUnits(st *state.State, svc *state.Service, n int, placement []*instance.Placement) ([]*state.Unit, error) {
	units := make([]*state.Unit, n)
	// Hard code for now till we implement a different approach.
	policy := state.AssignCleanEmpty
	// All units should have the same networks as the service.
	networks, err := svc.Networks()
	if err != nil {
		return nil, errors.Errorf("cannot get service %q networks", svc.Name())
	}
	// TODO what do we do if we fail half-way through this process?
	for i := 0; i < n; i++ {
		unit, err := svc.AddUnit()
		if err != nil {
			return nil, errors.Annotatef(err, "cannot add unit %d/%d to service %q", i+1, n, svc.Name())
		}
		// Are there still placement directives to use?
		if i > len(placement)-1 {
			if err := st.AssignUnit(unit, policy); err != nil {
				return nil, errors.Trace(err)
			}
			units[i] = unit
			continue
		}
		if err := st.AssignUnitWithPlacement(unit, placement[i], networks); err != nil {
			return nil, errors.Annotatef(err, "adding new machine to host unit %q", unit.Name())
		}
		units[i] = unit
	}
	return units, nil
}