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service.go
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service.go
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package kubernetes
import (
"encoding/json"
"strings"
"time"
log "github.com/justcy/go-micro/v4/logger"
"github.com/justcy/go-micro/v4/runtime"
"github.com/justcy/go-micro/v4/util/kubernetes/api"
"github.com/justcy/go-micro/v4/util/kubernetes/client"
)
type service struct {
// service to manage
*runtime.Service
// Kubernetes service
kservice *client.Service
// Kubernetes deployment
kdeploy *client.Deployment
// to be used logger
logger log.Logger
}
func parseError(err error) *api.Status {
status := new(api.Status)
json.Unmarshal([]byte(err.Error()), &status)
return status
}
func newService(s *runtime.Service, c runtime.CreateOptions, l log.Logger) *service {
// use pre-formatted name/version
name := client.Format(s.Name)
version := client.Format(s.Version)
kservice := client.NewService(name, version, c.Type, c.Namespace)
kdeploy := client.NewDeployment(name, version, c.Type, c.Namespace)
// ensure the metadata is set
if kdeploy.Spec.Template.Metadata.Annotations == nil {
kdeploy.Spec.Template.Metadata.Annotations = make(map[string]string)
}
// create if non existent
if s.Metadata == nil {
s.Metadata = make(map[string]string)
}
// add the service metadata to the k8s labels, do this first so we
// don't override any labels used by the runtime, e.g. name
for k, v := range s.Metadata {
kdeploy.Metadata.Annotations[k] = v
}
// attach our values to the deployment; name, version, source
kdeploy.Metadata.Annotations["name"] = s.Name
kdeploy.Metadata.Annotations["version"] = s.Version
kdeploy.Metadata.Annotations["source"] = s.Source
// associate owner:group to be later augmented
kdeploy.Metadata.Annotations["owner"] = "micro"
kdeploy.Metadata.Annotations["group"] = "micro"
// update the deployment is a custom source is provided
if len(c.Image) > 0 {
for i := range kdeploy.Spec.Template.PodSpec.Containers {
kdeploy.Spec.Template.PodSpec.Containers[i].Image = c.Image
kdeploy.Spec.Template.PodSpec.Containers[i].Command = []string{}
kdeploy.Spec.Template.PodSpec.Containers[i].Args = []string{}
}
}
// define the environment values used by the container
env := make([]client.EnvVar, 0, len(c.Env))
for _, evar := range c.Env {
evarPair := strings.Split(evar, "=")
env = append(env, client.EnvVar{Name: evarPair[0], Value: evarPair[1]})
}
// if environment has been supplied update deployment default environment
if len(env) > 0 {
kdeploy.Spec.Template.PodSpec.Containers[0].Env = append(kdeploy.Spec.Template.PodSpec.Containers[0].Env, env...)
}
// set the command if specified
if len(c.Command) > 0 {
kdeploy.Spec.Template.PodSpec.Containers[0].Command = c.Command
}
if len(c.Args) > 0 {
kdeploy.Spec.Template.PodSpec.Containers[0].Args = c.Args
}
return &service{
Service: s,
kservice: kservice,
kdeploy: kdeploy,
logger: log.LoggerOrDefault(l),
}
}
func deploymentResource(d *client.Deployment) *client.Resource {
return &client.Resource{
Name: d.Metadata.Name,
Kind: "deployment",
Value: d,
}
}
func serviceResource(s *client.Service) *client.Resource {
return &client.Resource{
Name: s.Metadata.Name,
Kind: "service",
Value: s,
}
}
// Start starts the Kubernetes service. It creates new kubernetes deployment and service API objects.
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), opts...); err != nil {
s.logger.Logf(log.DebugLevel, "Runtime failed to create deployment: %v", err)
s.Status("error", err)
v := parseError(err)
if v.Reason == "AlreadyExists" {
return runtime.ErrAlreadyExists
}
return err
}
// create service now that the deployment has been created
if err := k.Create(serviceResource(s.kservice), opts...); err != nil {
s.logger.Logf(log.DebugLevel, "Runtime failed to create service: %v", err)
s.Status("error", err)
v := parseError(err)
if v.Reason == "AlreadyExists" {
return runtime.ErrAlreadyExists
}
return err
}
s.Status("started", nil)
return nil
}
func (s *service) Stop(k client.Client, opts ...client.DeleteOption) error {
// first attempt to delete service
if err := k.Delete(serviceResource(s.kservice), opts...); err != nil {
s.logger.Logf(log.DebugLevel, "Runtime failed to delete service: %v", err)
s.Status("error", err)
return err
}
// delete deployment once the service has been deleted
if err := k.Delete(deploymentResource(s.kdeploy), opts...); err != nil {
s.logger.Logf(log.DebugLevel, "Runtime failed to delete deployment: %v", err)
s.Status("error", err)
return err
}
s.Status("stopped", nil)
return nil
}
func (s *service) Update(k client.Client, opts ...client.UpdateOption) error {
if err := k.Update(deploymentResource(s.kdeploy), opts...); err != nil {
s.logger.Logf(log.DebugLevel, "Runtime failed to update deployment: %v", err)
s.Status("error", err)
return err
}
if err := k.Update(serviceResource(s.kservice), opts...); err != nil {
s.logger.Logf(log.DebugLevel, "Runtime failed to update service: %v", err)
return err
}
return nil
}
func (s *service) Status(status string, err error) {
s.Metadata["lastStatusUpdate"] = time.Now().Format(time.RFC3339)
if err == nil {
s.Metadata["status"] = status
delete(s.Metadata, "error")
return
}
s.Metadata["status"] = "error"
s.Metadata["error"] = err.Error()
}