Golang Machine.Units方法代碼示例

// machineTags returns machine-specific tags to set on the instance.
func (p *ProvisionerAPI) machineTags(m *state.Machine, jobs []multiwatcher.MachineJob) (map[string]string, error) {
	// Names of all units deployed to the machine.
	//
	// TODO(axw) 2015-06-02 #1461358
	// We need a worker that periodically updates
	// instance tags with current deployment info.
	units, err := m.Units()
	if err != nil {
		return nil, errors.Trace(err)
	}
	unitNames := make([]string, 0, len(units))
	for _, unit := range units {
		if !unit.IsPrincipal() {
			continue
		}
		unitNames = append(unitNames, unit.Name())
	}
	sort.Strings(unitNames)

	cfg, err := p.st.EnvironConfig()
	if err != nil {
		return nil, errors.Trace(err)
	}
	machineTags := instancecfg.InstanceTags(cfg, jobs)
	if len(unitNames) > 0 {
		machineTags[tags.JujuUnitsDeployed] = strings.Join(unitNames, " ")
	}
	return machineTags, nil
}

// commonServiceInstances returns instances with
// services in common with the specified machine.
func commonServiceInstances(st *state.State, m *state.Machine) ([]instance.Id, error) {
	units, err := m.Units()
	if err != nil {
		return nil, err
	}
	instanceIdSet := make(set.Strings)
	for _, unit := range units {
		if !unit.IsPrincipal() {
			continue
		}
		instanceIds, err := state.ServiceInstances(st, unit.ApplicationName())
		if err != nil {
			return nil, err
		}
		for _, instanceId := range instanceIds {
			instanceIdSet.Add(string(instanceId))
		}
	}
	instanceIds := make([]instance.Id, instanceIdSet.Size())
	// Sort values to simplify testing.
	for i, instanceId := range instanceIdSet.SortedValues() {
		instanceIds[i] = instance.Id(instanceId)
	}
	return instanceIds, nil
}

func (p *ProvisionerAPI) machineEndpointBindings(m *state.Machine) (map[string]string, error) {
	units, err := m.Units()
	if err != nil {
		return nil, errors.Trace(err)
	}

	spacesNamesToProviderIds, err := p.allSpaceNamesToProviderIds()
	if err != nil {
		return nil, errors.Trace(err)
	}

	var combinedBindings map[string]string
	processedServicesSet := set.NewStrings()
	for _, unit := range units {
		if !unit.IsPrincipal() {
			continue
		}
		service, err := unit.Application()
		if err != nil {
			return nil, errors.Trace(err)
		}
		if processedServicesSet.Contains(service.Name()) {
			// Already processed, skip it.
			continue
		}
		bindings, err := service.EndpointBindings()
		if err != nil {
			return nil, errors.Trace(err)
		}
		processedServicesSet.Add(service.Name())

		if len(bindings) == 0 {
			continue
		}
		if combinedBindings == nil {
			combinedBindings = make(map[string]string)
		}

		for endpoint, spaceName := range bindings {
			if spaceName == "" {
				// Skip unspecified bindings, as they won't affect the instance
				// selected for provisioning.
				continue
			}

			spaceProviderId, nameKnown := spacesNamesToProviderIds[spaceName]
			if nameKnown {
				combinedBindings[endpoint] = spaceProviderId
			} else {
				// Technically, this can't happen in practice, as we're
				// validating the bindings during service deployment.
				return nil, errors.Errorf("unknown space %q with no provider ID specified for endpoint %q", spaceName, endpoint)
			}
		}
	}
	return combinedBindings, nil
}