Golang errors.NewServiceUnavailable函数代码示例

// ResourceLocation returns a URL to which one can send traffic for the specified service.
func (rs *REST) ResourceLocation(ctx api.Context, id string) (*url.URL, http.RoundTripper, error) {
	// Allow ID as "svcname" or "svcname:port".
	svcName, portStr, valid := util.SplitPort(id)
	if !valid {
		return nil, nil, errors.NewBadRequest(fmt.Sprintf("invalid service request %q", id))
	}

	eps, err := rs.endpoints.GetEndpoints(ctx, svcName)
	if err != nil {
		return nil, nil, err
	}
	if len(eps.Subsets) == 0 {
		return nil, nil, errors.NewServiceUnavailable(fmt.Sprintf("no endpoints available for service %q", svcName))
	}
	// Pick a random Subset to start searching from.
	ssSeed := rand.Intn(len(eps.Subsets))
	// Find a Subset that has the port.
	for ssi := 0; ssi < len(eps.Subsets); ssi++ {
		ss := &eps.Subsets[(ssSeed+ssi)%len(eps.Subsets)]
		for i := range ss.Ports {
			if ss.Ports[i].Name == portStr {
				// Pick a random address.
				ip := ss.Addresses[rand.Intn(len(ss.Addresses))].IP
				port := ss.Ports[i].Port
				// We leave off the scheme ('http://') because we have no idea what sort of server
				// is listening at this endpoint.
				return &url.URL{
					Host: net.JoinHostPort(ip, strconv.Itoa(port)),
				}, nil, nil
			}
		}
	}
	return nil, nil, errors.NewServiceUnavailable(fmt.Sprintf("no endpoints available for service %q", id))
}

// ResourceLocation returns a URL to which one can send traffic for the specified service.
func (rs *REST) ResourceLocation(ctx api.Context, id string) (*url.URL, http.RoundTripper, error) {
	// Allow ID as "svcname", "svcname:port", or "scheme:svcname:port".
	svcScheme, svcName, portStr, valid := util.SplitSchemeNamePort(id)
	if !valid {
		return nil, nil, errors.NewBadRequest(fmt.Sprintf("invalid service request %q", id))
	}

	// If a port *number* was specified, find the corresponding service port name
	if portNum, err := strconv.ParseInt(portStr, 10, 64); err == nil {
		svc, err := rs.registry.GetService(ctx, svcName)
		if err != nil {
			return nil, nil, err
		}
		found := false
		for _, svcPort := range svc.Spec.Ports {
			if svcPort.Port == int(portNum) {
				// use the declared port's name
				portStr = svcPort.Name
				found = true
				break
			}
		}
		if !found {
			return nil, nil, errors.NewServiceUnavailable(fmt.Sprintf("no service port %d found for service %q", portNum, svcName))
		}
	}

	eps, err := rs.endpoints.GetEndpoints(ctx, svcName)
	if err != nil {
		return nil, nil, err
	}
	if len(eps.Subsets) == 0 {
		return nil, nil, errors.NewServiceUnavailable(fmt.Sprintf("no endpoints available for service %q", svcName))
	}
	// Pick a random Subset to start searching from.
	ssSeed := rand.Intn(len(eps.Subsets))
	// Find a Subset that has the port.
	for ssi := 0; ssi < len(eps.Subsets); ssi++ {
		ss := &eps.Subsets[(ssSeed+ssi)%len(eps.Subsets)]
		if len(ss.Addresses) == 0 {
			continue
		}
		for i := range ss.Ports {
			if ss.Ports[i].Name == portStr {
				// Pick a random address.
				ip := ss.Addresses[rand.Intn(len(ss.Addresses))].IP
				port := ss.Ports[i].Port
				return &url.URL{
					Scheme: svcScheme,
					Host:   net.JoinHostPort(ip, strconv.Itoa(port)),
				}, rs.proxyTransport, nil
			}
		}
	}
	return nil, nil, errors.NewServiceUnavailable(fmt.Sprintf("no endpoints available for service %q", id))
}

// TestCreateRetryUnrecoverable ensures that an attempt to create a mapping
// using failing registry update calls will return an error.
func TestCreateRetryUnrecoverable(t *testing.T) {
	rest := &REST{
		strategy: NewStrategy(testDefaultRegistry),
		imageRegistry: &fakeImageRegistry{
			createImage: func(ctx kapi.Context, image *api.Image) error {
				return nil
			},
		},
		imageStreamRegistry: &fakeImageStreamRegistry{
			getImageStream: func(ctx kapi.Context, id string) (*api.ImageStream, error) {
				return validImageStream(), nil
			},
			listImageStreams: func(ctx kapi.Context, options *kapi.ListOptions) (*api.ImageStreamList, error) {
				s := validImageStream()
				return &api.ImageStreamList{Items: []api.ImageStream{*s}}, nil
			},
			updateImageStreamStatus: func(ctx kapi.Context, repo *api.ImageStream) (*api.ImageStream, error) {
				return nil, errors.NewServiceUnavailable("unrecoverable error")
			},
		},
	}
	obj, err := rest.Create(kapi.NewDefaultContext(), validNewMappingWithName())
	if err == nil {
		t.Errorf("expected an error")
	}
	if obj != nil {
		t.Fatalf("expected a nil result")
	}
}

// ResourceLocation returns a URL to which one can send traffic for the specified service.
func (rs *REST) ResourceLocation(ctx api.Context, id string) (*url.URL, http.RoundTripper, error) {
	// Allow ID as "svcname", "svcname:port", or "scheme:svcname:port".
	svcScheme, svcName, portStr, valid := util.SplitSchemeNamePort(id)
	if !valid {
		return nil, nil, errors.NewBadRequest(fmt.Sprintf("invalid service request %q", id))
	}

	eps, err := rs.endpoints.GetEndpoints(ctx, svcName)
	if err != nil {
		return nil, nil, err
	}
	if len(eps.Subsets) == 0 {
		return nil, nil, errors.NewServiceUnavailable(fmt.Sprintf("no endpoints available for service %q", svcName))
	}
	// Pick a random Subset to start searching from.
	ssSeed := rand.Intn(len(eps.Subsets))
	// Find a Subset that has the port.
	for ssi := 0; ssi < len(eps.Subsets); ssi++ {
		ss := &eps.Subsets[(ssSeed+ssi)%len(eps.Subsets)]
		if len(ss.Addresses) == 0 {
			continue
		}
		for i := range ss.Ports {
			if ss.Ports[i].Name == portStr {
				// Pick a random address.
				ip := ss.Addresses[rand.Intn(len(ss.Addresses))].IP
				port := ss.Ports[i].Port
				return &url.URL{
					Scheme: svcScheme,
					Host:   net.JoinHostPort(ip, strconv.Itoa(port)),
				}, rs.proxyTransport, nil
			} else {
				port, err := strconv.ParseInt(portStr, 10, 64)
				if err == nil && int(port) == ss.Ports[i].Port {
					ip := ss.Addresses[rand.Intn(len(ss.Addresses))].IP
					return &url.URL{
						Scheme: svcScheme,
						Host:   net.JoinHostPort(ip, portStr),
					}, rs.proxyTransport, nil
				}
			}
		}
	}
	return nil, nil, errors.NewServiceUnavailable(fmt.Sprintf("no endpoints available for service %q", id))
}