Runtime Namespace (#1547)

* Add context option to runtime; Add dynamic namespace to kubectl client

* Add namespace runtime arg

* Fixes & Debugging

* Pass options in k8s runtime

* Set namespace on k8s resources

* Additional Logging

* More debugging

* Remove Debugging

* Ensure namespace exists

* Add debugging

* Refactor namespaceExists check

* Fix

* Fix

* Fix

* Fix

* Change the way we check for namespace

* Fix

* Tidying Up

* Fix Test

* Fix merge bugs

* Serialize k8s namespaces

* Add namespace to watch

* Serialize namespace when creating k8s namespace

Co-authored-by: Ben Toogood <ben@micro.mu>
Co-authored-by: Asim Aslam <asim@aslam.me>

debug/log/kubernetes/kubernetes.go

@@ -67,7 +67,7 @@ func (k *klog) getMatchingPods() ([]string, error) {
 	// TODO: specify micro:service
 	// l["micro"] = "service"
 
-	if err := k.client.Get(r, l); err != nil {
+	if err := k.client.Get(r, client.GetLabels(l)); err != nil {
 		return nil, err
 	}
 

runtime/default.go

@@ -335,7 +335,7 @@ func (r *runtime) Read(opts ...ReadOption) ([]*Service, error) {
 }
 
 // Update attemps to update the service
-func (r *runtime) Update(s *Service) error {
+func (r *runtime) Update(s *Service, opts ...UpdateOption) error {
 	r.Lock()
 	service, ok := r.services[serviceKey(s)]
 	r.Unlock()
@@ -350,7 +350,7 @@ func (r *runtime) Update(s *Service) error {
 }
 
 // Delete removes the service from the runtime and stops it
-func (r *runtime) Delete(s *Service) error {
+func (r *runtime) Delete(s *Service, opts ...DeleteOption) error {
 	r.Lock()
 	defer r.Unlock()
 

runtime/kubernetes/kubernetes.go

@@ -6,7 +6,7 @@ import (
 	"sync"
 	"time"
 
-	"github.com/micro/go-micro/v2/logger"
+	log "github.com/micro/go-micro/v2/logger"
 	"github.com/micro/go-micro/v2/runtime"
 	"github.com/micro/go-micro/v2/util/kubernetes/client"
 )
@@ -24,11 +24,48 @@ type kubernetes struct {
 	closed chan bool
 	// client is kubernetes client
 	client client.Client
+	// namespaces which exist
+	namespaces []client.Namespace
+}
+
+// namespaceExists returns a boolean indicating if a namespace exists
+func (k *kubernetes) namespaceExists(name string) (bool, error) {
+	// populate the cache
+	if k.namespaces == nil {
+		namespaceList := new(client.NamespaceList)
+		resource := &client.Resource{Kind: "namespace", Value: namespaceList}
+		if err := k.client.List(resource); err != nil {
+			return false, err
+		}
+		k.namespaces = namespaceList.Items
+	}
+
+	// check if the namespace exists in the cache
+	for _, n := range k.namespaces {
+		if n.Metadata.Name == name {
+			return true, nil
+		}
+	}
+
+	return false, nil
+}
+
+// createNamespace creates a new k8s namespace
+func (k *kubernetes) createNamespace(namespace string) error {
+	ns := client.Namespace{Metadata: &client.Metadata{Name: namespace}}
+	err := k.client.Create(&client.Resource{Kind: "namespace", Value: ns})
+
+	// add to cache
+	if err == nil && k.namespaces != nil {
+		k.namespaces = append(k.namespaces, ns)
+	}
+
+	return err
 }
 
 // getService queries kubernetes for micro service
 // NOTE: this function is not thread-safe
-func (k *kubernetes) getService(labels map[string]string) ([]*service, error) {
+func (k *kubernetes) getService(labels map[string]string, opts ...client.GetOption) ([]*service, error) {
 	// get the service status
 	serviceList := new(client.ServiceList)
 	r := &client.Resource{
@@ -36,8 +73,10 @@ func (k *kubernetes) getService(labels map[string]string) ([]*service, error) {
 		Value: serviceList,
 	}
 
+	opts = append(opts, client.GetLabels(labels))
+
 	// get the service from k8s
-	if err := k.client.Get(r, labels); err != nil {
+	if err := k.client.Get(r, opts...); err != nil {
 		return nil, err
 	}
 
@@ -47,7 +86,7 @@ func (k *kubernetes) getService(labels map[string]string) ([]*service, error) {
 		Kind:  "deployment",
 		Value: depList,
 	}
-	if err := k.client.Get(d, labels); err != nil {
+	if err := k.client.Get(d, opts...); err != nil {
 		return nil, err
 	}
 
@@ -57,7 +96,7 @@ func (k *kubernetes) getService(labels map[string]string) ([]*service, error) {
 		Kind:  "pod",
 		Value: podList,
 	}
-	if err := k.client.Get(p, labels); err != nil {
+	if err := k.client.Get(p, opts...); err != nil {
 		return nil, err
 	}
 
@@ -206,8 +245,8 @@ func (k *kubernetes) run(events <-chan runtime.Event) {
 			// - do we even need the ticker for k8s services?
 		case event := <-events:
 			// NOTE: we only handle Update events for now
-			if logger.V(logger.DebugLevel, logger.DefaultLogger) {
+			if log.V(log.DebugLevel, log.DefaultLogger) {
-				logger.Debugf("Runtime received notification event: %v", event)
+				log.Debugf("Runtime received notification event: %v", event)
 			}
 			switch event.Type {
 			case runtime.Update:
@@ -237,11 +276,11 @@ func (k *kubernetes) run(events <-chan runtime.Event) {
 				err := k.client.Get(&client.Resource{
 					Kind:  "deployment",
 					Value: deployed,
-				}, labels)
+				}, client.GetLabels(labels))
 
 				if err != nil {
-					if logger.V(logger.DebugLevel, logger.DefaultLogger) {
+					if log.V(log.DebugLevel, log.DefaultLogger) {
-						logger.Debugf("Runtime update failed to get service %s: %v", event.Service, err)
+						log.Debugf("Runtime update failed to get service %s: %v", event.Service, err)
 					}
 					continue
 				}
@@ -262,20 +301,20 @@ func (k *kubernetes) run(events <-chan runtime.Event) {
 					// update the build time
 					service.Spec.Template.Metadata.Annotations["updated"] = fmt.Sprintf("%d", event.Timestamp.Unix())
 
-					if logger.V(logger.DebugLevel, logger.DefaultLogger) {
+					if log.V(log.DebugLevel, log.DefaultLogger) {
-						logger.Debugf("Runtime updating service: %s deployment: %s", event.Service, service.Metadata.Name)
+						log.Debugf("Runtime updating service: %s deployment: %s", event.Service, service.Metadata.Name)
 					}
 					if err := k.client.Update(deploymentResource(&service)); err != nil {
-						if logger.V(logger.DebugLevel, logger.DefaultLogger) {
+						if log.V(log.DebugLevel, log.DefaultLogger) {
-							logger.Debugf("Runtime failed to update service %s: %v", event.Service, err)
+							log.Debugf("Runtime failed to update service %s: %v", event.Service, err)
 						}
 						continue
 					}
 				}
 			}
 		case <-k.closed:
-			if logger.V(logger.DebugLevel, logger.DefaultLogger) {
+			if log.V(log.DebugLevel, log.DefaultLogger) {
-				logger.Debugf("Runtime stopped")
+				log.Debugf("Runtime stopped")
 			}
 			return
 		}
@@ -305,7 +344,7 @@ func (k *kubernetes) Logs(s *runtime.Service, options ...runtime.LogsOption) (ru
 		go func() {
 			records, err := klo.Read()
 			if err != nil {
-				logger.Errorf("Failed to get logs for service '%v' from k8s: %v", err)
+				log.Errorf("Failed to get logs for service '%v' from k8s: %v", err)
 				return
 			}
 			// @todo: this might actually not run before podLogStream starts
@@ -371,6 +410,16 @@ func (k *kubernetes) Create(s *runtime.Service, opts ...runtime.CreateOption) er
 		s.Source = k.options.Source
 	}
 
+	// ensure the namespace exists
+	namespace := client.SerializeResourceName(options.Namespace)
+	if exist, err := k.namespaceExists(namespace); err == nil && !exist {
+		if err := k.createNamespace(namespace); err != nil {
+			return err
+		}
+	} else if err != nil {
+		return err
+	}
+
 	// determine the image from the source and options
 	options.Image = k.getImage(s, options)
 
@@ -378,7 +427,7 @@ func (k *kubernetes) Create(s *runtime.Service, opts ...runtime.CreateOption) er
 	service := newService(s, options)
 
 	// start the service
-	return service.Start(k.client)
+	return service.Start(k.client, client.CreateNamespace(options.Namespace))
 }
 
 // Read returns all instances of given service
@@ -423,8 +472,12 @@ func (k *kubernetes) Read(opts ...runtime.ReadOption) ([]*runtime.Service, error
 }
 
 // Update the service in place
-func (k *kubernetes) Update(s *runtime.Service) error {
+func (k *kubernetes) Update(s *runtime.Service, opts ...runtime.UpdateOption) error {
-	// TODO: set the type
+	var options runtime.UpdateOptions
+	for _, o := range opts {
+		o(&options)
+	}
+
 	labels := map[string]string{}
 
 	if len(s.Name) > 0 {
@@ -459,7 +512,7 @@ func (k *kubernetes) Update(s *runtime.Service) error {
 		service.kdeploy.Spec.Template.Metadata.Annotations["updated"] = fmt.Sprintf("%d", time.Now().Unix())
 
 		// update the service
-		if err := service.Update(k.client); err != nil {
+		if err := service.Update(k.client, client.UpdateNamespace(options.Namespace)); err != nil {
 			return err
 		}
 	}
@@ -468,16 +521,22 @@ func (k *kubernetes) Update(s *runtime.Service) error {
 }
 
 // Delete removes a service
-func (k *kubernetes) Delete(s *runtime.Service) error {
+func (k *kubernetes) Delete(s *runtime.Service, opts ...runtime.DeleteOption) error {
+	var options runtime.DeleteOptions
+	for _, o := range opts {
+		o(&options)
+	}
+
 	k.Lock()
 	defer k.Unlock()
 
 	// create new kubernetes micro service
 	service := newService(s, runtime.CreateOptions{
 		Type:      k.options.Type,
+		Namespace: options.Namespace,
 	})
 
-	return service.Stop(k.client)
+	return service.Stop(k.client, client.DeleteNamespace(options.Namespace))
 }
 
 // Start starts the runtime
@@ -500,8 +559,8 @@ func (k *kubernetes) Start() error {
 		events, err = k.options.Scheduler.Notify()
 		if err != nil {
 			// TODO: should we bail here?
-			if logger.V(logger.DebugLevel, logger.DefaultLogger) {
+			if log.V(log.DebugLevel, log.DefaultLogger) {
-				logger.Debugf("Runtime failed to start update notifier")
+				log.Debugf("Runtime failed to start update notifier")
 			}
 		}
 	}

runtime/kubernetes/kubernetes_logs.go

@@ -70,7 +70,7 @@ func (k *klog) getMatchingPods() ([]string, error) {
 	// TODO: specify micro:service
 	// l["micro"] = "service"
 
-	if err := k.client.Get(r, l); err != nil {
+	if err := k.client.Get(r, client.GetLabels(l)); err != nil {
 		return nil, err
 	}
 

runtime/kubernetes/service.go

@@ -30,8 +30,8 @@ func newService(s *runtime.Service, c runtime.CreateOptions) *service {
 	name := client.Format(s.Name)
 	version := client.Format(s.Version)
 
-	kservice := client.NewService(name, version, c.Type)
+	kservice := client.NewService(name, version, c.Type, c.Namespace)
-	kdeploy := client.NewDeployment(name, version, c.Type)
+	kdeploy := client.NewDeployment(name, version, c.Type, c.Namespace)
 
 	// ensure the metadata is set
 	if kdeploy.Spec.Template.Metadata.Annotations == nil {
@@ -112,9 +112,9 @@ func serviceResource(s *client.Service) *client.Resource {
 }
 
 // Start starts the Kubernetes service. It creates new kubernetes deployment and service API objects
-func (s *service) Start(k client.Client) error {
+func (s *service) Start(k client.Client, opts ...client.CreateOption) error {
 	// create deployment first; if we fail, we dont create service
-	if err := k.Create(deploymentResource(s.kdeploy)); err != nil {
+	if err := k.Create(deploymentResource(s.kdeploy), opts...); err != nil {
 		if logger.V(logger.DebugLevel, logger.DefaultLogger) {
 			logger.Debugf("Runtime failed to create deployment: %v", err)
 		}
@@ -126,7 +126,7 @@ func (s *service) Start(k client.Client) error {
 		return err
 	}
 	// create service now that the deployment has been created
-	if err := k.Create(serviceResource(s.kservice)); err != nil {
+	if err := k.Create(serviceResource(s.kservice), opts...); err != nil {
 		if logger.V(logger.DebugLevel, logger.DefaultLogger) {
 			logger.Debugf("Runtime failed to create service: %v", err)
 		}
@@ -143,9 +143,9 @@ func (s *service) Start(k client.Client) error {
 	return nil
 }
 
-func (s *service) Stop(k client.Client) error {
+func (s *service) Stop(k client.Client, opts ...client.DeleteOption) error {
 	// first attempt to delete service
-	if err := k.Delete(serviceResource(s.kservice)); err != nil {
+	if err := k.Delete(serviceResource(s.kservice), opts...); err != nil {
 		if logger.V(logger.DebugLevel, logger.DefaultLogger) {
 			logger.Debugf("Runtime failed to delete service: %v", err)
 		}
@@ -153,7 +153,7 @@ func (s *service) Stop(k client.Client) error {
 		return err
 	}
 	// delete deployment once the service has been deleted
-	if err := k.Delete(deploymentResource(s.kdeploy)); err != nil {
+	if err := k.Delete(deploymentResource(s.kdeploy), opts...); err != nil {
 		if logger.V(logger.DebugLevel, logger.DefaultLogger) {
 			logger.Debugf("Runtime failed to delete deployment: %v", err)
 		}
@@ -166,15 +166,15 @@ func (s *service) Stop(k client.Client) error {
 	return nil
 }
 
-func (s *service) Update(k client.Client) error {
+func (s *service) Update(k client.Client, opts ...client.UpdateOption) error {
-	if err := k.Update(deploymentResource(s.kdeploy)); err != nil {
+	if err := k.Update(deploymentResource(s.kdeploy), opts...); err != nil {
 		if logger.V(logger.DebugLevel, logger.DefaultLogger) {
 			logger.Debugf("Runtime failed to update deployment: %v", err)
 		}
 		s.Status("error", err)
 		return err
 	}
-	if err := k.Update(serviceResource(s.kservice)); err != nil {
+	if err := k.Update(serviceResource(s.kservice), opts...); err != nil {
 		if logger.V(logger.DebugLevel, logger.DefaultLogger) {
 			logger.Debugf("Runtime failed to update service: %v", err)
 		}

runtime/options.go

@@ -1,6 +1,7 @@
 package runtime
 
 import (
+	"context"
 	"io"
 )
 
@@ -66,6 +67,10 @@ type CreateOptions struct {
 	Retries int
 	// Specify the image to use
 	Image string
+	// Namespace to create the service in
+	Namespace string
+	// Specify the context to use
+	Context context.Context
 }
 
 // ReadOptions queries runtime services
@@ -76,6 +81,10 @@ type ReadOptions struct {
 	Version string
 	// Type of service
 	Type string
+	// Namespace the service is running in
+	Namespace string
+	// Specify the context to use
+	Context context.Context
 }
 
 // CreateType sets the type of service to create
@@ -92,6 +101,20 @@ func CreateImage(img string) CreateOption {
 	}
 }
 
+// CreateNamespace sets the namespace
+func CreateNamespace(ns string) CreateOption {
+	return func(o *CreateOptions) {
+		o.Namespace = ns
+	}
+}
+
+// CreateContext sets the context
+func CreateContext(ctx context.Context) CreateOption {
+	return func(o *CreateOptions) {
+		o.Context = ctx
+	}
+}
+
 // WithCommand specifies the command to execute
 func WithCommand(cmd ...string) CreateOption {
 	return func(o *CreateOptions) {
@@ -150,6 +173,66 @@ func ReadType(t string) ReadOption {
 	}
 }
 
+// ReadNamespace sets the namespace
+func ReadNamespace(ns string) ReadOption {
+	return func(o *ReadOptions) {
+		o.Namespace = ns
+	}
+}
+
+// ReadContext sets the context
+func ReadContext(ctx context.Context) ReadOption {
+	return func(o *ReadOptions) {
+		o.Context = ctx
+	}
+}
+
+type UpdateOption func(o *UpdateOptions)
+
+type UpdateOptions struct {
+	// Namespace the service is running in
+	Namespace string
+	// Specify the context to use
+	Context context.Context
+}
+
+// UpdateNamespace sets the namespace
+func UpdateNamespace(ns string) UpdateOption {
+	return func(o *UpdateOptions) {
+		o.Namespace = ns
+	}
+}
+
+// UpdateContext sets the context
+func UpdateContext(ctx context.Context) UpdateOption {
+	return func(o *UpdateOptions) {
+		o.Context = ctx
+	}
+}
+
+type DeleteOption func(o *DeleteOptions)
+
+type DeleteOptions struct {
+	// Namespace the service is running in
+	Namespace string
+	// Specify the context to use
+	Context context.Context
+}
+
+// DeleteNamespace sets the namespace
+func DeleteNamespace(ns string) DeleteOption {
+	return func(o *DeleteOptions) {
+		o.Namespace = ns
+	}
+}
+
+// DeleteContext sets the context
+func DeleteContext(ctx context.Context) DeleteOption {
+	return func(o *DeleteOptions) {
+		o.Context = ctx
+	}
+}
+
 // LogsOption configures runtime logging
 type LogsOption func(o *LogsOptions)
 
@@ -159,6 +242,10 @@ type LogsOptions struct {
 	Count int64
 	// Stream new lines?
 	Stream bool
+	// Namespace the service is running in
+	Namespace string
+	// Specify the context to use
+	Context context.Context
 }
 
 // LogsExistingCount confiures how many existing lines to show
@@ -174,3 +261,17 @@ func LogsStream(stream bool) LogsOption {
 		l.Stream = stream
 	}
 }
+
+// LogsNamespace sets the namespace
+func LogsNamespace(ns string) LogsOption {
+	return func(o *LogsOptions) {
+		o.Namespace = ns
+	}
+}
+
+// LogsContext sets the context
+func LogsContext(ctx context.Context) LogsOption {
+	return func(o *LogsOptions) {
+		o.Context = ctx
+	}
+}

runtime/runtime.go

@@ -24,9 +24,9 @@ type Runtime interface {
 	// Read returns the service
 	Read(...ReadOption) ([]*Service, error)
 	// Update the service in place
-	Update(*Service) error
+	Update(*Service, ...UpdateOption) error
 	// Remove a service
-	Delete(*Service) error
+	Delete(*Service, ...DeleteOption) error
 	// Logs returns the logs for a service
 	Logs(*Service, ...LogsOption) (LogStream, error)
 	// Start starts the runtime

runtime/service/service.go

@@ -30,11 +30,13 @@ func (s *svc) Init(opts ...runtime.Option) error {
 
 // Create registers a service in the runtime
 func (s *svc) Create(svc *runtime.Service, opts ...runtime.CreateOption) error {
-	options := runtime.CreateOptions{}
+	var options runtime.CreateOptions
-	// apply requested options
 	for _, o := range opts {
 		o(&options)
 	}
+	if options.Context == nil {
+		options.Context = context.Background()
+	}
 
 	// set the default source from MICRO_RUNTIME_SOURCE
 	if len(svc.Source) == 0 {
@@ -58,15 +60,23 @@ func (s *svc) Create(svc *runtime.Service, opts ...runtime.CreateOption) error {
 		},
 	}
 
-	if _, err := s.runtime.Create(context.Background(), req); err != nil {
+	if _, err := s.runtime.Create(options.Context, req); err != nil {
 		return err
 	}
 
 	return nil
 }
 
-func (s *svc) Logs(service *runtime.Service, options ...runtime.LogsOption) (runtime.LogStream, error) {
+func (s *svc) Logs(service *runtime.Service, opts ...runtime.LogsOption) (runtime.LogStream, error) {
-	ls, err := s.runtime.Logs(context.Background(), &pb.LogsRequest{
+	var options runtime.LogsOptions
+	for _, o := range opts {
+		o(&options)
+	}
+	if options.Context == nil {
+		options.Context = context.Background()
+	}
+
+	ls, err := s.runtime.Logs(options.Context, &pb.LogsRequest{
 		Service: service.Name,
 		Stream:  true,
 		Count:   10, // @todo pass in actual options
@@ -122,11 +132,13 @@ func (l *serviceLogStream) Stop() error {
 
 // Read returns the service with the given name from the runtime
 func (s *svc) Read(opts ...runtime.ReadOption) ([]*runtime.Service, error) {
-	options := runtime.ReadOptions{}
+	var options runtime.ReadOptions
-	// apply requested options
 	for _, o := range opts {
 		o(&options)
 	}
+	if options.Context == nil {
+		options.Context = context.Background()
+	}
 
 	// runtime service create request
 	req := &pb.ReadRequest{
@@ -137,7 +149,7 @@ func (s *svc) Read(opts ...runtime.ReadOption) ([]*runtime.Service, error) {
 		},
 	}
 
-	resp, err := s.runtime.Read(context.Background(), req)
+	resp, err := s.runtime.Read(options.Context, req)
 	if err != nil {
 		return nil, err
 	}
@@ -157,7 +169,15 @@ func (s *svc) Read(opts ...runtime.ReadOption) ([]*runtime.Service, error) {
 }
 
 // Update updates the running service
-func (s *svc) Update(svc *runtime.Service) error {
+func (s *svc) Update(svc *runtime.Service, opts ...runtime.UpdateOption) error {
+	var options runtime.UpdateOptions
+	for _, o := range opts {
+		o(&options)
+	}
+	if options.Context == nil {
+		options.Context = context.Background()
+	}
+
 	// runtime service create request
 	req := &pb.UpdateRequest{
 		Service: &pb.Service{
@@ -168,7 +188,7 @@ func (s *svc) Update(svc *runtime.Service) error {
 		},
 	}
 
-	if _, err := s.runtime.Update(context.Background(), req); err != nil {
+	if _, err := s.runtime.Update(options.Context, req); err != nil {
 		return err
 	}
 
@@ -176,7 +196,15 @@ func (s *svc) Update(svc *runtime.Service) error {
 }
 
 // Delete stops and removes the service from the runtime
-func (s *svc) Delete(svc *runtime.Service) error {
+func (s *svc) Delete(svc *runtime.Service, opts ...runtime.DeleteOption) error {
+	var options runtime.DeleteOptions
+	for _, o := range opts {
+		o(&options)
+	}
+	if options.Context == nil {
+		options.Context = context.Background()
+	}
+
 	// runtime service create request
 	req := &pb.DeleteRequest{
 		Service: &pb.Service{
@@ -187,7 +215,7 @@ func (s *svc) Delete(svc *runtime.Service) error {
 		},
 	}
 
-	if _, err := s.runtime.Delete(context.Background(), req); err != nil {
+	if _, err := s.runtime.Delete(options.Context, req); err != nil {
 		return err
 	}
 

util/kubernetes/api/request.go

@@ -75,7 +75,9 @@ func (r *Request) Delete() *Request {
 
 // Namespace is to set the namespace to operate on
 func (r *Request) Namespace(s string) *Request {
+	if len(s) > 0 {
 		r.namespace = s
+	}
 	return r
 }
 
@@ -158,6 +160,9 @@ func (r *Request) SetHeader(key, value string) *Request {
 func (r *Request) request() (*http.Request, error) {
 	var url string
 	switch r.resource {
+	case "namespace":
+		// /api/v1/namespaces/
+		url = fmt.Sprintf("%s/api/v1/namespaces/", r.host)
 	case "pod", "service", "endpoint":
 		// /api/v1/namespaces/{namespace}/pods
 		url = fmt.Sprintf("%s/api/v1/namespaces/%s/%ss/", r.host, r.namespace, r.resource)

util/kubernetes/client/client.go

@@ -10,6 +10,7 @@ import (
 	"net/http"
 	"os"
 	"path"
+	"regexp"
 	"strings"
 
 	"github.com/micro/go-micro/v2/logger"
@@ -23,6 +24,8 @@ var (
 	ErrReadNamespace = errors.New("Could not read namespace from service account secret")
 	// DefaultImage is default micro image
 	DefaultImage = "micro/go-micro"
+	// DefaultNamespace is the default k8s namespace
+	DefaultNamespace = "default"
 )
 
 // Client ...
@@ -33,41 +36,28 @@ type client struct {
 // Kubernetes client
 type Client interface {
 	// Create creates new API resource
-	Create(*Resource) error
+	Create(*Resource, ...CreateOption) error
 	// Get queries API resrouces
-	Get(*Resource, map[string]string) error
+	Get(*Resource, ...GetOption) error
 	// Update patches existing API object
-	Update(*Resource) error
+	Update(*Resource, ...UpdateOption) error
 	// Delete deletes API resource
-	Delete(*Resource) error
+	Delete(*Resource, ...DeleteOption) error
 	// List lists API resources
-	List(*Resource) error
+	List(*Resource, ...ListOption) error
 	// Log gets log for a pod
 	Log(*Resource, ...LogOption) (io.ReadCloser, error)
 	// Watch for events
 	Watch(*Resource, ...WatchOption) (Watcher, error)
 }
 
-func detectNamespace() (string, error) {
-	nsPath := path.Join(serviceAccountPath, "namespace")
-
-	// Make sure it's a file and we can read it
-	if s, e := os.Stat(nsPath); e != nil {
-		return "", e
-	} else if s.IsDir() {
-		return "", ErrReadNamespace
-	}
-
-	// Read the file, and cast to a string
-	if ns, e := ioutil.ReadFile(nsPath); e != nil {
-		return string(ns), e
-	} else {
-		return string(ns), nil
-	}
-}
-
 // Create creates new API object
-func (c *client) Create(r *Resource) error {
+func (c *client) Create(r *Resource, opts ...CreateOption) error {
+	var options CreateOptions
+	for _, o := range opts {
+		o(&options)
+	}
+
 	b := new(bytes.Buffer)
 	if err := renderTemplate(r.Kind, b, r.Value); err != nil {
 		return err
@@ -76,18 +66,35 @@ func (c *client) Create(r *Resource) error {
 	return api.NewRequest(c.opts).
 		Post().
 		SetHeader("Content-Type", "application/yaml").
+		Namespace(options.Namespace).
 		Resource(r.Kind).
 		Body(b).
 		Do().
 		Error()
 }
 
+var (
+	nameRegex = regexp.MustCompile("[^a-zA-Z0-9]+")
+)
+
+// SerializeResourceName removes all spacial chars from a string so it
+// can be used as a k8s resource name
+func SerializeResourceName(ns string) string {
+	return nameRegex.ReplaceAllString(ns, "-")
+}
+
 // Get queries API objects and stores the result in r
-func (c *client) Get(r *Resource, labels map[string]string) error {
+func (c *client) Get(r *Resource, opts ...GetOption) error {
+	var options GetOptions
+	for _, o := range opts {
+		o(&options)
+	}
+
 	return api.NewRequest(c.opts).
 		Get().
 		Resource(r.Kind).
-		Params(&api.Params{LabelSelector: labels}).
+		Namespace(options.Namespace).
+		Params(&api.Params{LabelSelector: options.Labels}).
 		Do().
 		Into(r.Value)
 }
@@ -103,7 +110,8 @@ func (c *client) Log(r *Resource, opts ...LogOption) (io.ReadCloser, error) {
 		Get().
 		Resource(r.Kind).
 		SubResource("log").
-		Name(r.Name)
+		Name(r.Name).
+		Namespace(options.Namespace)
 
 	if options.Params != nil {
 		req.Params(&api.Params{Additional: options.Params})
@@ -121,12 +129,18 @@ func (c *client) Log(r *Resource, opts ...LogOption) (io.ReadCloser, error) {
 }
 
 // Update updates API object
-func (c *client) Update(r *Resource) error {
+func (c *client) Update(r *Resource, opts ...UpdateOption) error {
+	var options UpdateOptions
+	for _, o := range opts {
+		o(&options)
+	}
+
 	req := api.NewRequest(c.opts).
 		Patch().
 		SetHeader("Content-Type", "application/strategic-merge-patch+json").
 		Resource(r.Kind).
-		Name(r.Name)
+		Name(r.Name).
+		Namespace(options.Namespace)
 
 	switch r.Kind {
 	case "service":
@@ -143,21 +157,33 @@ func (c *client) Update(r *Resource) error {
 }
 
 // Delete removes API object
-func (c *client) Delete(r *Resource) error {
+func (c *client) Delete(r *Resource, opts ...DeleteOption) error {
+	var options DeleteOptions
+	for _, o := range opts {
+		o(&options)
+	}
+
 	return api.NewRequest(c.opts).
 		Delete().
 		Resource(r.Kind).
 		Name(r.Name).
+		Namespace(options.Namespace).
 		Do().
 		Error()
 }
 
 // List lists API objects and stores the result in r
-func (c *client) List(r *Resource) error {
+func (c *client) List(r *Resource, opts ...ListOption) error {
+	var options ListOptions
+	for _, o := range opts {
+		o(&options)
+	}
+
 	labels := map[string]string{
 		"micro": "service",
 	}
-	return c.Get(r, labels)
+
+	return c.Get(r, GetLabels(labels), GetNamespace(options.Namespace))
 }
 
 // Watch returns an event stream
@@ -183,13 +209,14 @@ func (c *client) Watch(r *Resource, opts ...WatchOption) (Watcher, error) {
 		Get().
 		Resource(r.Kind).
 		Name(r.Name).
+		Namespace(options.Namespace).
 		Params(params)
 
 	return newWatcher(req)
 }
 
 // NewService returns default micro kubernetes service definition
-func NewService(name, version, typ string) *Service {
+func NewService(name, version, typ, namespace string) *Service {
 	if logger.V(logger.TraceLevel, logger.DefaultLogger) {
 		logger.Tracef("kubernetes default service: name: %s, version: %s", name, version)
 	}
@@ -208,7 +235,7 @@ func NewService(name, version, typ string) *Service {
 
 	Metadata := &Metadata{
 		Name:      svcName,
-		Namespace: "default",
+		Namespace: SerializeResourceName(namespace),
 		Version:   version,
 		Labels:    Labels,
 	}
@@ -228,7 +255,7 @@ func NewService(name, version, typ string) *Service {
 }
 
 // NewService returns default micro kubernetes deployment definition
-func NewDeployment(name, version, typ string) *Deployment {
+func NewDeployment(name, version, typ, namespace string) *Deployment {
 	if logger.V(logger.TraceLevel, logger.DefaultLogger) {
 		logger.Tracef("kubernetes default deployment: name: %s, version: %s", name, version)
 	}
@@ -247,7 +274,7 @@ func NewDeployment(name, version, typ string) *Deployment {
 
 	Metadata := &Metadata{
 		Name:        depName,
-		Namespace:   "default",
+		Namespace:   SerializeResourceName(namespace),
 		Version:     version,
 		Labels:      Labels,
 		Annotations: map[string]string{},
@@ -319,11 +346,6 @@ func NewClusterClient() *client {
 	}
 	t := string(token)
 
-	ns, err := detectNamespace()
-	if err != nil {
-		logger.Fatal(err)
-	}
-
 	crt, err := CertPoolFromFile(path.Join(serviceAccountPath, "ca.crt"))
 	if err != nil {
 		logger.Fatal(err)
@@ -342,8 +364,8 @@ func NewClusterClient() *client {
 		opts: &api.Options{
 			Client:      c,
 			Host:        host,
-			Namespace:   ns,
 			BearerToken: &t,
+			Namespace:   DefaultNamespace,
 		},
 	}
 }

util/kubernetes/client/options.go

@@ -1,13 +1,38 @@
 package client
 
+type CreateOptions struct {
+	Namespace string
+}
+
+type GetOptions struct {
+	Namespace string
+	Labels    map[string]string
+}
+type UpdateOptions struct {
+	Namespace string
+}
+type DeleteOptions struct {
+	Namespace string
+}
+type ListOptions struct {
+	Namespace string
+}
+
 type LogOptions struct {
+	Namespace string
 	Params    map[string]string
 }
 
 type WatchOptions struct {
+	Namespace string
 	Params    map[string]string
 }
 
+type CreateOption func(*CreateOptions)
+type GetOption func(*GetOptions)
+type UpdateOption func(*UpdateOptions)
+type DeleteOption func(*DeleteOptions)
+type ListOption func(*ListOptions)
 type LogOption func(*LogOptions)
 type WatchOption func(*WatchOptions)
 
@@ -24,3 +49,59 @@ func WatchParams(p map[string]string) WatchOption {
 		w.Params = p
 	}
 }
+
+// CreateNamespace sets the namespace for creating a resource
+func CreateNamespace(ns string) CreateOption {
+	return func(o *CreateOptions) {
+		o.Namespace = SerializeResourceName(ns)
+	}
+}
+
+// GetNamespace sets the namespace for getting a resource
+func GetNamespace(ns string) GetOption {
+	return func(o *GetOptions) {
+		o.Namespace = SerializeResourceName(ns)
+	}
+}
+
+// GetLabels sets the labels for when getting a resource
+func GetLabels(ls map[string]string) GetOption {
+	return func(o *GetOptions) {
+		o.Labels = ls
+	}
+}
+
+// UpdateNamespace sets the namespace for updating a resource
+func UpdateNamespace(ns string) UpdateOption {
+	return func(o *UpdateOptions) {
+		o.Namespace = SerializeResourceName(ns)
+	}
+}
+
+// DeleteNamespace sets the namespace for deleting a resource
+func DeleteNamespace(ns string) DeleteOption {
+	return func(o *DeleteOptions) {
+		o.Namespace = SerializeResourceName(ns)
+	}
+}
+
+// ListNamespace sets the namespace for listing resources
+func ListNamespace(ns string) ListOption {
+	return func(o *ListOptions) {
+		o.Namespace = SerializeResourceName(ns)
+	}
+}
+
+// LogNamespace sets the namespace for logging a resource
+func LogNamespace(ns string) LogOption {
+	return func(o *LogOptions) {
+		o.Namespace = SerializeResourceName(ns)
+	}
+}
+
+// WatchNamespace sets the namespace for watching a resource
+func WatchNamespace(ns string) WatchOption {
+	return func(o *WatchOptions) {
+		o.Namespace = SerializeResourceName(ns)
+	}
+}

util/kubernetes/client/types.go

@@ -183,3 +183,8 @@ type Template struct {
 type Namespace struct {
 	Metadata *Metadata `json:"metadata,omitempty"`
 }
+
+// NamespaceList
+type NamespaceList struct {
+	Items []Namespace `json:"items"`
+}

util/kubernetes/client/util_test.go

@@ -9,16 +9,17 @@ func TestTemplates(t *testing.T) {
 	name := "foo"
 	version := "123"
 	typ := "service"
+	namespace := "default"
 
 	// Render default service
-	s := NewService(name, version, typ)
+	s := NewService(name, version, typ, namespace)
 	bs := new(bytes.Buffer)
 	if err := renderTemplate(templates["service"], bs, s); err != nil {
 		t.Errorf("Failed to render kubernetes service: %v", err)
 	}
 
 	// Render default deployment
-	d := NewDeployment(name, version, typ)
+	d := NewDeployment(name, version, typ, namespace)
 	bd := new(bytes.Buffer)
 	if err := renderTemplate(templates["deployment"], bd, d); err != nil {
 		t.Errorf("Failed to render kubernetes deployment: %v", err)