Golang labels.Nothing函数代码示例

// NodeSelectorRequirementsAsSelector converts the []NodeSelectorRequirement api type into a struct that implements
// labels.Selector.
func NodeSelectorRequirementsAsSelector(nsm []NodeSelectorRequirement) (labels.Selector, error) {
	if len(nsm) == 0 {
		return labels.Nothing(), nil
	}
	selector := labels.NewSelector()
	for _, expr := range nsm {
		var op labels.Operator
		switch expr.Operator {
		case NodeSelectorOpIn:
			op = labels.InOperator
		case NodeSelectorOpNotIn:
			op = labels.NotInOperator
		case NodeSelectorOpExists:
			op = labels.ExistsOperator
		case NodeSelectorOpDoesNotExist:
			op = labels.DoesNotExistOperator
		case NodeSelectorOpGt:
			op = labels.GreaterThanOperator
		case NodeSelectorOpLt:
			op = labels.LessThanOperator
		default:
			return nil, fmt.Errorf("%q is not a valid node selector operator", expr.Operator)
		}
		r, err := labels.NewRequirement(expr.Key, op, sets.NewString(expr.Values...))
		if err != nil {
			return nil, err
		}
		selector = selector.Add(*r)
	}
	return selector, nil
}

func TestLabelSelectorAsSelector(t *testing.T) {
	matchLabels := map[string]string{"foo": "bar"}
	matchExpressions := []LabelSelectorRequirement{{
		Key:      "baz",
		Operator: LabelSelectorOpIn,
		Values:   []string{"qux", "norf"},
	}}
	mustParse := func(s string) labels.Selector {
		out, e := labels.Parse(s)
		if e != nil {
			panic(e)
		}
		return out
	}
	tc := []struct {
		in        *LabelSelector
		out       labels.Selector
		expectErr bool
	}{
		{in: nil, out: labels.Nothing()},
		{in: &LabelSelector{}, out: labels.Everything()},
		{
			in:  &LabelSelector{MatchLabels: matchLabels},
			out: mustParse("foo in (bar)"),
		},
		{
			in:  &LabelSelector{MatchExpressions: matchExpressions},
			out: mustParse("baz in (norf,qux)"),
		},
		{
			in:  &LabelSelector{MatchLabels: matchLabels, MatchExpressions: matchExpressions},
			out: mustParse("foo in (bar),baz in (norf,qux)"),
		},
		{
			in: &LabelSelector{
				MatchExpressions: []LabelSelectorRequirement{{
					Key:      "baz",
					Operator: LabelSelectorOpExists,
					Values:   []string{"qux", "norf"},
				}},
			},
			expectErr: true,
		},
	}

	for i, tc := range tc {
		out, err := LabelSelectorAsSelector(tc.in)
		if err == nil && tc.expectErr {
			t.Errorf("[%v]expected error but got none.", i)
		}
		if err != nil && !tc.expectErr {
			t.Errorf("[%v]did not expect error but got: %v", i, err)
		}
		if !reflect.DeepEqual(out, tc.out) {
			t.Errorf("[%v]expected:\n\t%+v\nbut got:\n\t%+v", i, tc.out, out)
		}
	}
}

func (d *MasterNode) Check() types.DiagnosticResult {
	r := types.NewDiagnosticResult(MasterNodeName)

	nodes, err := d.KubeClient.Nodes().List(api.ListOptions{LabelSelector: labels.Nothing()})
	if err != nil {
		r.Error("DClu3002", err, fmt.Sprintf(clientErrorGettingNodes, err))
		return r
	}

	// Provide the actual net.LookupHost as the DNS resolver:
	serverIps, err := resolveServerIP(d.ServerUrl, net.LookupHost)
	if err != nil {
		r.Error("DClu3007", err, "Error resolving servers IP")
		return r
	}

	return searchNodesForIP(nodes.Items, serverIps)
}

// LabelSelectorAsSelector converts the LabelSelector api type into a struct that implements
// labels.Selector
func LabelSelectorAsSelector(ps *LabelSelector) (labels.Selector, error) {
	if ps == nil {
		return labels.Nothing(), nil
	}
	if len(ps.MatchLabels)+len(ps.MatchExpressions) == 0 {
		return labels.Everything(), nil
	}
	selector := labels.LabelSelector{}
	for k, v := range ps.MatchLabels {
		req, err := labels.NewRequirement(k, labels.InOperator, sets.NewString(v))
		if err != nil {
			return nil, err
		}
		selector = append(selector, *req)
	}
	for _, expr := range ps.MatchExpressions {
		var op labels.Operator
		switch expr.Operator {
		case LabelSelectorOpIn:
			op = labels.InOperator
		case LabelSelectorOpNotIn:
			op = labels.NotInOperator
		case LabelSelectorOpExists:
			op = labels.ExistsOperator
		case LabelSelectorOpDoesNotExist:
			op = labels.DoesNotExistOperator
		default:
			return nil, fmt.Errorf("%q is not a valid pod selector operator", expr.Operator)
		}
		req, err := labels.NewRequirement(expr.Key, op, sets.NewString(expr.Values...))
		if err != nil {
			return nil, err
		}
		selector = append(selector, *req)
	}
	sort.Sort(labels.ByKey(selector))
	return selector, nil
}

// LabelSelectorAsSelector converts the LabelSelector api type into a struct that implements
// labels.Selector
// Note: This function should be kept in sync with the selector methods in pkg/labels/selector.go
func LabelSelectorAsSelector(ps *LabelSelector) (labels.Selector, error) {
	if ps == nil {
		return labels.Nothing(), nil
	}
	if len(ps.MatchLabels)+len(ps.MatchExpressions) == 0 {
		return labels.Everything(), nil
	}
	selector := labels.NewSelector()
	for k, v := range ps.MatchLabels {
		r, err := labels.NewRequirement(k, selection.Equals, []string{v})
		if err != nil {
			return nil, err
		}
		selector = selector.Add(*r)
	}
	for _, expr := range ps.MatchExpressions {
		var op selection.Operator
		switch expr.Operator {
		case LabelSelectorOpIn:
			op = selection.In
		case LabelSelectorOpNotIn:
			op = selection.NotIn
		case LabelSelectorOpExists:
			op = selection.Exists
		case LabelSelectorOpDoesNotExist:
			op = selection.DoesNotExist
		default:
			return nil, fmt.Errorf("%q is not a valid pod selector operator", expr.Operator)
		}
		r, err := labels.NewRequirement(expr.Key, op, append([]string(nil), expr.Values...))
		if err != nil {
			return nil, err
		}
		selector = selector.Add(*r)
	}
	return selector, nil
}

func (r *replicationController) Selector() labels.Selector {
	if r.Spec.Selector == nil {
		return labels.Nothing()
	}
	return labels.SelectorFromSet(labels.Set(r.Spec.Selector))
}

func TestNodeSelectorRequirementsAsSelector(t *testing.T) {
	matchExpressions := []NodeSelectorRequirement{{
		Key:      "foo",
		Operator: NodeSelectorOpIn,
		Values:   []string{"bar", "baz"},
	}}
	mustParse := func(s string) labels.Selector {
		out, e := labels.Parse(s)
		if e != nil {
			panic(e)
		}
		return out
	}
	tc := []struct {
		in        []NodeSelectorRequirement
		out       labels.Selector
		expectErr bool
	}{
		{in: nil, out: labels.Nothing()},
		{in: []NodeSelectorRequirement{}, out: labels.Nothing()},
		{
			in:  matchExpressions,
			out: mustParse("foo in (baz,bar)"),
		},
		{
			in: []NodeSelectorRequirement{{
				Key:      "foo",
				Operator: NodeSelectorOpExists,
				Values:   []string{"bar", "baz"},
			}},
			expectErr: true,
		},
		{
			in: []NodeSelectorRequirement{{
				Key:      "foo",
				Operator: NodeSelectorOpGt,
				Values:   []string{"1.1"},
			}},
			out: mustParse("foo>1.1"),
		},
		{
			in: []NodeSelectorRequirement{{
				Key:      "bar",
				Operator: NodeSelectorOpLt,
				Values:   []string{"7.1"},
			}},
			out: mustParse("bar<7.1"),
		},
	}

	for i, tc := range tc {
		out, err := NodeSelectorRequirementsAsSelector(tc.in)
		if err == nil && tc.expectErr {
			t.Errorf("[%v]expected error but got none.", i)
		}
		if err != nil && !tc.expectErr {
			t.Errorf("[%v]did not expect error but got: %v", i, err)
		}
		if !reflect.DeepEqual(out, tc.out) {
			t.Errorf("[%v]expected:\n\t%+v\nbut got:\n\t%+v", i, tc.out, out)
		}
	}
}

func main() {
	cmd, consulOpts := flags.ParseWithConsulOptions()
	client := kp.NewConsulClient(consulOpts)
	logger := logging.NewLogger(logrus.Fields{})
	dsstore := dsstore.NewConsul(client, 3, &logger)
	applicator := labels.NewConsulApplicator(client, 3)

	switch cmd {
	case CmdCreate:
		minHealth, err := strconv.Atoi(*createMinHealth)
		if err != nil {
			log.Fatalf("Invalid value for minimum health, expected integer: %v", err)
		}
		name := ds_fields.ClusterName(*createName)

		manifest, err := manifest.FromPath(*createManifest)
		if err != nil {
			log.Fatalf("%s", err)
		}

		podID := manifest.ID()

		if *createTimeout <= time.Duration(0) {
			log.Fatalf("Timeout must be a positive non-zero value, got '%v'", *createTimeout)
		}

		selectorString := *createSelector
		if *createEverywhere {
			selectorString = klabels.Everything().String()
		} else if selectorString == "" {
			selectorString = klabels.Nothing().String()
			log.Fatal("Explicit everything selector not allowed, please use the --everwhere flag")
		}
		selector, err := parseNodeSelectorWithPrompt(klabels.Nothing(), selectorString, applicator)
		if err != nil {
			log.Fatalf("Error occurred: %v", err)
		}

		if err = confirmMinheathForSelector(minHealth, selector, applicator); err != nil {
			log.Fatalf("Error occurred: %v", err)
		}

		ds, err := dsstore.Create(manifest, minHealth, name, selector, podID, *createTimeout)
		if err != nil {
			log.Fatalf("err: %v", err)
		}
		fmt.Printf("%v has been created in consul", ds.ID)
		fmt.Println()

	case CmdGet:
		id := ds_fields.ID(*getID)
		ds, _, err := dsstore.Get(id)
		if err != nil {
			log.Fatalf("err: %v", err)
		}
		bytes, err := json.Marshal(ds)
		if err != nil {
			logger.WithError(err).Fatalln("Unable to marshal daemon set as JSON")
		}
		fmt.Printf("%s", bytes)

	case CmdList:
		dsList, err := dsstore.List()
		if err != nil {
			log.Fatalf("err: %v", err)
		}
		podID := types.PodID(*listPod)
		for _, ds := range dsList {
			if *listPod == "" || podID == ds.PodID {
				fmt.Printf("%s/%s:%s\n", ds.PodID, ds.Name, ds.ID)
			}
		}

	case CmdEnable:
		id := ds_fields.ID(*enableID)

		mutator := func(ds ds_fields.DaemonSet) (ds_fields.DaemonSet, error) {
			if !ds.Disabled {
				return ds, util.Errorf("Daemon set has already been enabled")
			}
			ds.Disabled = false
			return ds, nil
		}

		_, err := dsstore.MutateDS(id, mutator)
		if err != nil {
			log.Fatalf("err: %v", err)
		}
		fmt.Printf("The daemon set '%s' has been successfully enabled in consul", id.String())
		fmt.Println()

	case CmdDisable:
		id := ds_fields.ID(*disableID)

		mutator := func(ds ds_fields.DaemonSet) (ds_fields.DaemonSet, error) {
			if ds.Disabled {
				return ds, util.Errorf("Daemon set has already been disabled")
			}
			ds.Disabled = true
			return ds, nil
//.........这里部分代码省略.........

func (s *service) Selector() labels.Selector {
	if s.Spec.Selector == nil {
		return labels.Nothing()
	}
	return labels.SelectorFromSet(labels.Set(s.Spec.Selector))
}