micro/runtime/kubernetes/kubernetes.go

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// Package kubernetes implements kubernetes micro runtime
package kubernetes
import (
"fmt"
"sync"
"time"
"github.com/micro/go-micro/runtime"
"github.com/micro/go-micro/util/kubernetes/client"
"github.com/micro/go-micro/util/log"
)
// action to take on runtime service
type action int
const (
start action = iota
update
stop
)
type kubernetes struct {
sync.RWMutex
// options configure runtime
options runtime.Options
// indicates if we're running
running bool
// used to stop the runtime
closed chan bool
// client is kubernetes client
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client client.Client
}
// getService queries kubernetes for micro service
// NOTE: this function is not thread-safe
func (k *kubernetes) getService(labels map[string]string) ([]*runtime.Service, error) {
// get the service status
serviceList := new(client.ServiceList)
r := &client.Resource{
Kind: "service",
Value: serviceList,
}
// get the service from k8s
if err := k.client.Get(r, labels); err != nil {
return nil, err
}
// get the deployment status
depList := new(client.DeploymentList)
d := &client.Resource{
Kind: "deployment",
Value: depList,
}
// get the deployment from k8s
if err := k.client.Get(d, labels); err != nil {
return nil, err
}
// service map
svcMap := make(map[string]*runtime.Service)
// collect info from kubernetes service
for _, kservice := range serviceList.Items {
// name of the service
name := kservice.Metadata.Labels["name"]
// version of the service
version := kservice.Metadata.Labels["version"]
// save as service
svcMap[name+version] = &runtime.Service{
Name: name,
Version: version,
Metadata: make(map[string]string),
}
// copy annotations metadata into service metadata
for k, v := range kservice.Metadata.Annotations {
svcMap[name+version].Metadata[k] = v
}
}
// collect additional info from kubernetes deployment
for _, kdep := range depList.Items {
// name of the service
name := kdep.Metadata.Labels["name"]
// versio of the service
version := kdep.Metadata.Labels["version"]
// access existing service map based on name + version
if svc, ok := svcMap[name+version]; ok {
// we're expecting our own service name in metadata
if _, ok := kdep.Metadata.Annotations["name"]; !ok {
continue
}
// set the service name, version and source
// based on existing annotations we stored
svc.Name = kdep.Metadata.Annotations["name"]
svc.Version = kdep.Metadata.Annotations["version"]
svc.Source = kdep.Metadata.Annotations["source"]
// delete from metadata
delete(kdep.Metadata.Annotations, "name")
delete(kdep.Metadata.Annotations, "version")
delete(kdep.Metadata.Annotations, "source")
// copy all annotations metadata into service metadata
for k, v := range kdep.Metadata.Annotations {
svc.Metadata[k] = v
}
// parse out deployment status and inject into service metadata
if len(kdep.Status.Conditions) > 0 {
status := kdep.Status.Conditions[0].Type
// pick the last known condition type and mark the service status with it
log.Debugf("Runtime setting %s service deployment status: %v", name, status)
svc.Metadata["status"] = status
}
// parse out deployment build
if build, ok := kdep.Spec.Template.Metadata.Annotations["build"]; ok {
buildTime, err := time.Parse(time.RFC3339, build)
if err != nil {
log.Debugf("Runtime failed parsing build time for %s: %v", name, err)
continue
}
svc.Metadata["build"] = fmt.Sprintf("%d", buildTime.Unix())
continue
}
// if no build annotation is found, set it to current time
svc.Metadata["build"] = fmt.Sprintf("%d", time.Now().Unix())
}
}
// collect all the services and return
services := make([]*runtime.Service, 0, len(serviceList.Items))
for _, service := range svcMap {
services = append(services, service)
}
return services, nil
}
// run runs the runtime management loop
func (k *kubernetes) run(events <-chan runtime.Event) {
t := time.NewTicker(time.Second * 10)
defer t.Stop()
for {
select {
case <-t.C:
// TODO: figure out what to do here
// - do we even need the ticker for k8s services?
case event := <-events:
// NOTE: we only handle Update events for now
log.Debugf("Runtime received notification event: %v", event)
switch event.Type {
case runtime.Update:
// only process if there's an actual service
// we do not update all the things individually
if len(event.Service) == 0 {
continue
}
// format the name
name := client.Format(event.Service)
// set the default labels
labels := map[string]string{
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"micro": k.options.Type,
"name": name,
}
if len(event.Version) > 0 {
labels["version"] = event.Version
}
// get the deployment status
deployed := new(client.DeploymentList)
// get the existing service rather than creating a new one
err := k.client.Get(&client.Resource{
Kind: "deployment",
Value: deployed,
}, labels)
if err != nil {
log.Debugf("Runtime update failed to get service %s: %v", event.Service, err)
continue
}
// technically we should not receive multiple versions but hey ho
for _, service := range deployed.Items {
// check the name matches
if service.Metadata.Name != name {
continue
}
// update build time annotation
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if service.Spec.Template.Metadata.Annotations == nil {
service.Spec.Template.Metadata.Annotations = make(map[string]string)
}
// check the existing build timestamp
if build, ok := service.Spec.Template.Metadata.Annotations["build"]; ok {
buildTime, err := time.Parse(time.RFC3339, build)
if err == nil && !event.Timestamp.After(buildTime) {
continue
}
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}
// update the build time
service.Spec.Template.Metadata.Annotations["build"] = event.Timestamp.Format(time.RFC3339)
log.Debugf("Runtime updating service: %s deployment: %s", event.Service, service.Metadata.Name)
if err := k.client.Update(deploymentResource(&service)); err != nil {
log.Debugf("Runtime failed to update service %s: %v", event.Service, err)
continue
}
}
}
case <-k.closed:
log.Debugf("Runtime stopped")
return
}
}
}
// Init initializes runtime options
func (k *kubernetes) Init(opts ...runtime.Option) error {
k.Lock()
defer k.Unlock()
for _, o := range opts {
o(&k.options)
}
return nil
}
// Creates a service
func (k *kubernetes) Create(s *runtime.Service, opts ...runtime.CreateOption) error {
k.Lock()
defer k.Unlock()
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options := runtime.CreateOptions{
Type: k.options.Type,
}
for _, o := range opts {
o(&options)
}
// quickly prevalidate the name and version
name := s.Name
if len(s.Version) > 0 {
name = name + "-" + s.Version
}
// format as we'll format in the deployment
name = client.Format(name)
// create new kubernetes micro service
service := newService(s, options)
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// start the service
return service.Start(k.client)
}
// Read returns all instances of given service
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func (k *kubernetes) Read(opts ...runtime.ReadOption) ([]*runtime.Service, error) {
k.Lock()
defer k.Unlock()
// set the default labels
labels := map[string]string{
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"micro": k.options.Type,
}
var options runtime.ReadOptions
for _, o := range opts {
o(&options)
}
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if len(options.Service) > 0 {
labels["name"] = client.Format(options.Service)
}
// add version to labels if a version has been supplied
if len(options.Version) > 0 {
labels["version"] = options.Version
}
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if len(options.Type) > 0 {
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labels["micro"] = options.Type
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}
return k.getService(labels)
}
// List the managed services
func (k *kubernetes) List() ([]*runtime.Service, error) {
k.Lock()
defer k.Unlock()
labels := map[string]string{
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"micro": k.options.Type,
}
log.Debugf("Runtime listing all micro services")
return k.getService(labels)
}
// Update the service in place
func (k *kubernetes) Update(s *runtime.Service) error {
// create new kubernetes micro service
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service := newService(s, runtime.CreateOptions{
Type: k.options.Type,
})
// update build time annotation
service.kdeploy.Spec.Template.Metadata.Annotations["build"] = time.Now().Format(time.RFC3339)
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return service.Update(k.client)
}
// Delete removes a service
func (k *kubernetes) Delete(s *runtime.Service) error {
k.Lock()
defer k.Unlock()
// create new kubernetes micro service
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service := newService(s, runtime.CreateOptions{
Type: k.options.Type,
})
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return service.Stop(k.client)
}
// Start starts the runtime
func (k *kubernetes) Start() error {
k.Lock()
defer k.Unlock()
// already running
if k.running {
return nil
}
// set running
k.running = true
k.closed = make(chan bool)
var events <-chan runtime.Event
if k.options.Notifier != nil {
var err error
events, err = k.options.Notifier.Notify()
if err != nil {
// TODO: should we bail here?
log.Debugf("Runtime failed to start update notifier")
}
}
go k.run(events)
return nil
}
// Stop shuts down the runtime
func (k *kubernetes) Stop() error {
k.Lock()
defer k.Unlock()
if !k.running {
return nil
}
select {
case <-k.closed:
return nil
default:
close(k.closed)
// set not running
k.running = false
// stop the notifier too
if k.options.Notifier != nil {
return k.options.Notifier.Close()
}
}
return nil
}
// String implements stringer interface
func (k *kubernetes) String() string {
return "kubernetes"
}
// NewRuntime creates new kubernetes runtime
func NewRuntime(opts ...runtime.Option) runtime.Runtime {
// get default options
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options := runtime.Options{
// Create labels with type "micro": "service"
Type: "service",
}
// apply requested options
for _, o := range opts {
o(&options)
}
// kubernetes client
client := client.NewClusterClient()
return &kubernetes{
options: options,
closed: make(chan bool),
client: client,
}
}