156 lines
3.2 KiB
Go
156 lines
3.2 KiB
Go
package client
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import (
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"bytes"
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"crypto/tls"
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"errors"
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"io/ioutil"
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"net/http"
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"os"
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"path"
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"github.com/micro/go-micro/runtime/kubernetes/client/api"
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"github.com/micro/go-micro/util/log"
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)
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var (
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// path to kubernetes service account token
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serviceAccountPath = "/var/run/secrets/kubernetes.io/serviceaccount"
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// ErrReadNamespace is returned when the names could not be read from service account
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ErrReadNamespace = errors.New("Could not read namespace from service account secret")
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)
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// Client ...
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type client struct {
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opts *api.Options
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}
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// NewClientInCluster creates a Kubernetes client for use from within a k8s pod.
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func NewClientInCluster() *client {
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host := "https://" + os.Getenv("KUBERNETES_SERVICE_HOST") + ":" + os.Getenv("KUBERNETES_SERVICE_PORT")
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s, err := os.Stat(serviceAccountPath)
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if err != nil {
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log.Fatal(err)
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}
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if s == nil || !s.IsDir() {
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log.Fatal(errors.New("service account not found"))
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}
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token, err := ioutil.ReadFile(path.Join(serviceAccountPath, "token"))
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if err != nil {
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log.Fatal(err)
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}
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t := string(token)
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ns, err := detectNamespace()
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if err != nil {
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log.Fatal(err)
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}
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crt, err := CertPoolFromFile(path.Join(serviceAccountPath, "ca.crt"))
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if err != nil {
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log.Fatal(err)
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}
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c := &http.Client{
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Transport: &http.Transport{
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TLSClientConfig: &tls.Config{
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RootCAs: crt,
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},
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DisableCompression: true,
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},
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}
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return &client{
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opts: &api.Options{
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Client: c,
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Host: host,
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Namespace: ns,
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BearerToken: &t,
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},
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}
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}
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func detectNamespace() (string, error) {
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nsPath := path.Join(serviceAccountPath, "namespace")
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// Make sure it's a file and we can read it
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if s, e := os.Stat(nsPath); e != nil {
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return "", e
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} else if s.IsDir() {
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return "", ErrReadNamespace
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}
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// Read the file, and cast to a string
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if ns, e := ioutil.ReadFile(nsPath); e != nil {
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return string(ns), e
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} else {
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return string(ns), nil
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}
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}
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// Create creates new API object
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func (c *client) Create(r *Resource) error {
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b := new(bytes.Buffer)
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if err := renderTemplate(r.Kind, b, r.Value); err != nil {
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return err
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}
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return api.NewRequest(c.opts).
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Post().
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SetHeader("Content-Type", "application/yaml").
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Resource(r.Kind).
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Body(b).
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Do().
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Error()
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}
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// Get queries API objects and stores the result in r
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func (c *client) Get(r *Resource, labels map[string]string) error {
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return api.NewRequest(c.opts).
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Get().
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Resource(r.Kind).
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Params(&api.Params{LabelSelector: labels}).
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Do().
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Into(r.Value)
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}
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// Update updates API object
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func (c *client) Update(r *Resource) error {
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req := api.NewRequest(c.opts).
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Patch().
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SetHeader("Content-Type", "application/strategic-merge-patch+json").
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Resource(r.Kind).
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Name(r.Name)
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switch r.Kind {
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case "service":
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req.Body(r.Value.(*Service))
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case "deployment":
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req.Body(r.Value.(*Deployment))
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default:
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return errors.New("unsupported resource")
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}
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return req.Do().Error()
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}
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// Delete removes API object
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func (c *client) Delete(r *Resource) error {
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return api.NewRequest(c.opts).
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Delete().
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Resource(r.Kind).
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Name(r.Name).
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Do().
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Error()
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}
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// List lists API objects and stores the result in r
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func (c *client) List(r *Resource) error {
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labels := map[string]string{
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"micro": "service",
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}
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return c.Get(r, labels)
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}
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