switch to go vendoring

vendor/github.com/go-micro/plugins/v4/registry/kubernetes/LICENSE

@@ -0,0 +1,191 @@
+
+                                 Apache License
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+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
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+   END OF TERMS AND CONDITIONS
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+   Copyright 2015 Asim Aslam.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
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+   limitations under the License.

vendor/github.com/go-micro/plugins/v4/registry/kubernetes/README.md

@@ -0,0 +1,66 @@
+# Kubernetes Registry Plugin for micro
+This is a plugin for go-micro that allows you to use Kubernetes as a registry.
+
+
+## Overview
+This registry plugin makes use of Annotations and Labels on a Kubernetes pod
+to build a service discovery mechanism.
+
+
+## RBAC
+If your Kubernetes cluster has RBAC enabled, a role and role binding
+will need to be created to allow this plugin to `list` and `patch` pods.
+
+A cluster role can be used to specify the `list` and `patch`
+requirements, while a role binding per namespace can be used to apply
+the cluster role. The example RBAC configs below assume your Micro-based
+services are running in the `test` namespace, and the pods that contain
+the services are using the `micro-services` service account.
+
+```
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRole
+metadata:
+  name: micro-registry
+rules:
+- apiGroups:
+  - ""
+  resources:
+  - pods
+  verbs:
+  - list
+  - patch
+  - watch
+```
+
+```
+apiVersion: rbac.authorization.k8s.io/v1
+kind: RoleBinding
+metadata:
+  name: micro-registry
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: ClusterRole
+  name: micro-registry
+subjects:
+- kind: ServiceAccount
+  name: micro-services
+  namespace: test
+```
+
+
+## Gotchas
+* Registering/Deregistering relies on the HOSTNAME Environment Variable, which inside a pod
+is the place where it can be retrieved from. (This needs improving)
+
+
+## Connecting to the Kubernetes API
+### Within a pod
+If the `--registry_address` flag is omitted, the plugin will securely connect to
+the Kubernetes API using the pods "Service Account". No extra configuration is necessary.
+
+Find out more about service accounts here. http://kubernetes.io/docs/user-guide/accessing-the-cluster/
+
+### Outside of Kubernetes
+Some functions of the plugin should work, but its not been heavily tested.
+Currently no TLS support.

vendor/github.com/go-micro/plugins/v4/registry/kubernetes/client/api/request.go

@@ -0,0 +1,220 @@
+// Package api ...
+package api
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"net/url"
+
+	"github.com/go-micro/plugins/v4/registry/kubernetes/client/watch"
+)
+
+// Request is used to construct a http request for the k8s API.
+type Request struct {
+	client    *http.Client
+	header    http.Header
+	params    url.Values
+	method    string
+	host      string
+	namespace string
+
+	resource     string
+	resourceName *string
+	body         io.Reader
+
+	err error
+}
+
+// Params is the object to pass in to set parameters
+// on a request.
+type Params struct {
+	LabelSelector map[string]string
+	Watch         bool
+}
+
+// Options ...
+type Options struct {
+	Host        string
+	Namespace   string
+	BearerToken *string
+	Client      *http.Client
+}
+
+// NewRequest creates a k8s api request.
+func NewRequest(opts *Options) *Request {
+	req := Request{
+		header:    make(http.Header),
+		params:    make(url.Values),
+		client:    opts.Client,
+		namespace: opts.Namespace,
+		host:      opts.Host,
+	}
+
+	if opts.BearerToken != nil {
+		req.SetHeader("Authorization", "Bearer "+*opts.BearerToken)
+	}
+
+	return &req
+}
+
+// verb sets method.
+func (r *Request) verb(method string) *Request {
+	r.method = method
+	return r
+}
+
+// Get request.
+func (r *Request) Get() *Request {
+	return r.verb("GET")
+}
+
+// Post request.
+func (r *Request) Post() *Request {
+	return r.verb("POST")
+}
+
+// Put request.
+func (r *Request) Put() *Request {
+	return r.verb("PUT")
+}
+
+// Patch request
+// https://github.com/kubernetes/kubernetes/blob/master/docs/devel/api-conventions.md#patch-operations
+func (r *Request) Patch() *Request {
+	return r.verb("PATCH").SetHeader("Content-Type", "application/strategic-merge-patch+json")
+}
+
+// Delete request.
+func (r *Request) Delete() *Request {
+	return r.verb("DELETE")
+}
+
+// Namespace is to set the namespace to operate on.
+func (r *Request) Namespace(s string) *Request {
+	r.namespace = s
+	return r
+}
+
+// Resource is the type of resource the operation is
+// for, such as "services", "endpoints" or "pods".
+func (r *Request) Resource(s string) *Request {
+	r.resource = s
+	return r
+}
+
+// Name is for targeting a specific resource by id.
+func (r *Request) Name(s string) *Request {
+	r.resourceName = &s
+	return r
+}
+
+// Body pass in a body to set, this is for POST, PUT
+// and PATCH requests.
+func (r *Request) Body(in interface{}) *Request {
+	b := new(bytes.Buffer)
+	if err := json.NewEncoder(b).Encode(&in); err != nil {
+		r.err = err
+		return r
+	}
+
+	r.body = b
+
+	return r
+}
+
+// Params isused to set parameters on a request.
+func (r *Request) Params(p *Params) *Request {
+	for k, v := range p.LabelSelector {
+		// create new key=value pair
+		value := fmt.Sprintf("%s=%s", k, v)
+		// check if there's an existing value
+		if label := r.params.Get("labelSelector"); len(label) > 0 {
+			value = fmt.Sprintf("%s,%s", label, value)
+		}
+		// set and overwrite the value
+		r.params.Set("labelSelector", value)
+	}
+
+	return r
+}
+
+// SetHeader sets a header on a request with
+// a `key` and `value`.
+func (r *Request) SetHeader(key, value string) *Request {
+	r.header.Add(key, value)
+	return r
+}
+
+// request builds the http.Request from the options.
+func (r *Request) request() (*http.Request, error) {
+	url := fmt.Sprintf("%s/api/v1/namespaces/%s/%s/", r.host, r.namespace, r.resource)
+
+	// append resourceName if it is present
+	if r.resourceName != nil {
+		url += *r.resourceName
+	}
+
+	// append any query params
+	if len(r.params) > 0 {
+		url += "?" + r.params.Encode()
+	}
+
+	// build request
+	req, err := http.NewRequest(r.method, url, r.body)
+	if err != nil {
+		return nil, err
+	}
+
+	// set headers on request
+	req.Header = r.header
+
+	return req, nil
+}
+
+// Do builds and triggers the request.
+func (r *Request) Do() *Response {
+	if r.err != nil {
+		return &Response{
+			err: r.err,
+		}
+	}
+
+	req, err := r.request()
+	if err != nil {
+		return &Response{
+			err: err,
+		}
+	}
+
+	res, err := r.client.Do(req)
+	if err != nil {
+		return &Response{
+			err: err,
+		}
+	}
+
+	// return res, err
+	return newResponse(res, err)
+}
+
+// Watch builds and triggers the request, but will watch instead of return
+// an object.
+func (r *Request) Watch() (watch.Watch, error) {
+	if r.err != nil {
+		return nil, r.err
+	}
+
+	r.params.Set("watch", "true")
+
+	req, err := r.request()
+	if err != nil {
+		return nil, err
+	}
+
+	w, err := watch.NewBodyWatcher(req, r.client)
+
+	return w, err
+}

vendor/github.com/go-micro/plugins/v4/registry/kubernetes/client/api/response.go

@@ -0,0 +1,90 @@
+package api
+
+import (
+	"encoding/json"
+	"io"
+	"net/http"
+
+	"github.com/pkg/errors"
+	log "go-micro.dev/v4/logger"
+)
+
+// Errors ...
+var (
+	ErrNoPodName = errors.New("no pod name provided")
+	ErrNotFound  = errors.New("pod not found")
+	ErrDecode    = errors.New("error decoding")
+	ErrOther     = errors.New("unspecified error occurred in k8s registry")
+)
+
+// Response ...
+type Response struct {
+	res *http.Response
+	err error
+}
+
+// Error returns an error.
+func (r *Response) Error() error {
+	return r.err
+}
+
+// StatusCode returns status code for response.
+func (r *Response) StatusCode() int {
+	return r.res.StatusCode
+}
+
+// Decode decodes body into `data`.
+func (r *Response) Decode(data interface{}) error {
+	if r.err != nil {
+		return r.err
+	}
+
+	var err error
+	defer func() {
+		nerr := r.res.Body.Close()
+		if err != nil {
+			err = nerr
+		}
+	}()
+
+	decoder := json.NewDecoder(r.res.Body)
+
+	if err := decoder.Decode(&data); err != nil {
+		return errors.Wrap(ErrDecode, err.Error())
+	}
+
+	return r.err
+}
+
+func newResponse(r *http.Response, err error) *Response {
+	resp := &Response{
+		res: r,
+		err: err,
+	}
+
+	if err != nil {
+		return resp
+	}
+
+	// Check if request is successful.
+	s := resp.res.StatusCode
+	if s == http.StatusOK || s == http.StatusCreated || s == http.StatusNoContent {
+		return resp
+	}
+
+	if resp.res.StatusCode == http.StatusNotFound {
+		resp.err = ErrNotFound
+		return resp
+	}
+
+	log.Errorf("K8s: request failed with code %v", resp.res.StatusCode)
+
+	b, err := io.ReadAll(resp.res.Body)
+	if err == nil {
+		log.Errorf("K8s: request failed with body: %s", string(b))
+	}
+
+	resp.err = ErrOther
+
+	return resp
+}

vendor/github.com/go-micro/plugins/v4/registry/kubernetes/client/client.go

@@ -0,0 +1,142 @@
+// Package client is the kubernetes registry client.
+package client
+
+import (
+	"crypto/tls"
+	"errors"
+	"net/http"
+	"os"
+	"path"
+
+	"go-micro.dev/v4/logger"
+
+	"github.com/go-micro/plugins/v4/registry/kubernetes/client/api"
+	"github.com/go-micro/plugins/v4/registry/kubernetes/client/watch"
+)
+
+var (
+	serviceAccountPath = "/var/run/secrets/kubernetes.io/serviceaccount"
+
+	// ErrReadNamespace error when failed to read namespace.
+	ErrReadNamespace = errors.New("could not read namespace from service account secret")
+)
+
+// Client ...
+type client struct {
+	opts *api.Options
+}
+
+// NewClientByHost sets up a client by host.
+func NewClientByHost(host string) Kubernetes {
+	tr := &http.Transport{
+		TLSClientConfig: &tls.Config{
+			//nolint:gosec
+			InsecureSkipVerify: true,
+		},
+		DisableCompression: true,
+	}
+
+	c := &http.Client{
+		Transport: tr,
+	}
+
+	return &client{
+		opts: &api.Options{
+			Client:    c,
+			Host:      host,
+			Namespace: "default",
+		},
+	}
+}
+
+// NewClientInCluster should work similarly to the official api
+// NewInClient by setting up a client configuration for use within
+// a k8s pod.
+func NewClientInCluster() Kubernetes {
+	host := "https://" + os.Getenv("KUBERNETES_SERVICE_HOST") + ":" + os.Getenv("KUBERNETES_SERVICE_PORT")
+
+	s, err := os.Stat(serviceAccountPath)
+	if err != nil {
+		logger.Fatal(err)
+	}
+
+	if s == nil || !s.IsDir() {
+		logger.Fatal(errors.New("no k8s service account found"))
+	}
+
+	t, err := os.ReadFile(path.Join(serviceAccountPath, "token"))
+	if err != nil {
+		logger.Fatal(err)
+	}
+
+	token := string(t)
+
+	ns, err := detectNamespace()
+	if err != nil {
+		logger.Fatal(err)
+	}
+
+	crt, err := CertPoolFromFile(path.Join(serviceAccountPath, "ca.crt"))
+	if err != nil {
+		logger.Fatal(err)
+	}
+
+	c := &http.Client{
+		Transport: &http.Transport{
+			TLSClientConfig: &tls.Config{
+				RootCAs:    crt,
+				MinVersion: tls.VersionTLS12,
+			},
+			DisableCompression: true,
+		},
+	}
+
+	return &client{
+		opts: &api.Options{
+			Client:      c,
+			Host:        host,
+			Namespace:   ns,
+			BearerToken: &token,
+		},
+	}
+}
+
+// ListPods ...
+func (c *client) ListPods(labels map[string]string) (*PodList, error) {
+	var pods PodList
+	err := api.NewRequest(c.opts).Get().Resource("pods").Params(&api.Params{LabelSelector: labels}).Do().Decode(&pods)
+
+	return &pods, err
+}
+
+// UpdatePod ...
+func (c *client) UpdatePod(name string, p *Pod) (*Pod, error) {
+	var pod Pod
+	err := api.NewRequest(c.opts).Patch().Resource("pods").Name(name).Body(p).Do().Decode(&pod)
+
+	return &pod, err
+}
+
+// WatchPods ...
+func (c *client) WatchPods(labels map[string]string) (watch.Watch, error) {
+	return api.NewRequest(c.opts).Get().Resource("pods").Params(&api.Params{LabelSelector: labels}).Watch()
+}
+
+func detectNamespace() (string, error) {
+	nsPath := path.Join(serviceAccountPath, "namespace")
+
+	// Make sure it's a file and we can read it
+	if s, err := os.Stat(nsPath); err != nil {
+		return "", err
+	} else if s.IsDir() {
+		return "", ErrReadNamespace
+	}
+
+	// Read the file, and cast to a string
+	ns, err := os.ReadFile(path.Clean(nsPath))
+	if err != nil {
+		return string(ns), err
+	}
+
+	return string(ns), nil
+}

vendor/github.com/go-micro/plugins/v4/registry/kubernetes/client/kubernetes.go

@@ -0,0 +1,35 @@
+package client
+
+import "github.com/go-micro/plugins/v4/registry/kubernetes/client/watch"
+
+// Kubernetes ...
+type Kubernetes interface {
+	ListPods(labels map[string]string) (*PodList, error)
+	UpdatePod(podName string, pod *Pod) (*Pod, error)
+	WatchPods(labels map[string]string) (watch.Watch, error)
+}
+
+// PodList ...
+type PodList struct {
+	Items []Pod `json:"items"`
+}
+
+// Pod is the top level item for a pod.
+type Pod struct {
+	Metadata *Meta   `json:"metadata"`
+	Status   *Status `json:"status"`
+}
+
+// Meta ...
+type Meta struct {
+	Name              string             `json:"name,omitempty"`
+	Labels            map[string]*string `json:"labels,omitempty"`
+	Annotations       map[string]*string `json:"annotations,omitempty"`
+	DeletionTimestamp string             `json:"deletionTimestamp,omitempty"`
+}
+
+// Status ...
+type Status struct {
+	PodIP string `json:"podIP"`
+	Phase string `json:"phase"`
+}

vendor/github.com/go-micro/plugins/v4/registry/kubernetes/client/utils.go

@@ -0,0 +1,87 @@
+package client
+
+import (
+	"crypto/x509"
+	"encoding/pem"
+	"os"
+	"path/filepath"
+
+	"github.com/pkg/errors"
+)
+
+// COPIED FROM
+// https://github.com/kubernetes/kubernetes/blob/7a725418af4661067b56506faabc2d44c6d7703a/pkg/util/crypto/crypto.go
+
+// CertPoolFromFile returns an x509.CertPool containing the certificates in
+// the given PEM-encoded file. Returns an error if the file could not be read,
+// a certificate could not be parsed, or if the file does not contain any certificates.
+func CertPoolFromFile(filename string) (*x509.CertPool, error) {
+	certs, err := certificatesFromFile(filename)
+	if err != nil {
+		return nil, err
+	}
+
+	pool := x509.NewCertPool()
+	for _, cert := range certs {
+		pool.AddCert(cert)
+	}
+
+	return pool, nil
+}
+
+// certificatesFromFile returns the x509.Certificates contained in the given
+// PEM-encoded file. Returns an error if the file could not be read, a
+// certificate could not be parsed, or if the file does not contain any certificates.
+func certificatesFromFile(file string) ([]*x509.Certificate, error) {
+	if len(file) == 0 {
+		return nil, errors.New("error reading certificates from an empty filename")
+	}
+
+	pemBlock, err := os.ReadFile(filepath.Clean(file))
+	if err != nil {
+		return nil, err
+	}
+
+	certs, err := CertsFromPEM(pemBlock)
+	if err != nil {
+		return nil, errors.Wrapf(err, "error reading %s", file)
+	}
+
+	return certs, nil
+}
+
+// CertsFromPEM returns the x509.Certificates contained in the given PEM-encoded
+// byte array. Returns an error if a certificate could not be parsed, or if the
+// data does not contain any certificates.
+func CertsFromPEM(pemCerts []byte) ([]*x509.Certificate, error) {
+	ok := false
+	certs := []*x509.Certificate{}
+
+	for len(pemCerts) > 0 {
+		var block *pem.Block
+		block, pemCerts = pem.Decode(pemCerts)
+
+		if block == nil {
+			break
+		}
+
+		// Only use PEM "CERTIFICATE" blocks without extra headers
+		if block.Type != "CERTIFICATE" || len(block.Headers) != 0 {
+			continue
+		}
+
+		cert, err := x509.ParseCertificate(block.Bytes)
+		if err != nil {
+			return certs, err
+		}
+
+		certs = append(certs, cert)
+		ok = true
+	}
+
+	if !ok {
+		return certs, errors.New("could not read any certificates")
+	}
+
+	return certs, nil
+}

vendor/github.com/go-micro/plugins/v4/registry/kubernetes/client/watch/body.go

@@ -0,0 +1,104 @@
+package watch
+
+import (
+	"bufio"
+	"context"
+	"encoding/json"
+	"net/http"
+	"sync/atomic"
+	"time"
+
+	"github.com/pkg/errors"
+)
+
+// bodyWatcher scans the body of a request for chunks.
+type bodyWatcher struct {
+	ctx     context.Context
+	stop    context.CancelFunc
+	results chan Event
+	res     *http.Response
+	req     *http.Request
+}
+
+// Changes returns the results channel.
+func (wr *bodyWatcher) ResultChan() <-chan Event {
+	return wr.results
+}
+
+// Stop cancels the request.
+func (wr *bodyWatcher) Stop() {
+	select {
+	case <-wr.ctx.Done():
+		return
+	default:
+		wr.stop()
+		close(wr.results)
+	}
+}
+
+func (wr *bodyWatcher) stream() {
+	reader := bufio.NewReader(wr.res.Body)
+
+	// ignore first few messages from stream,
+	// as they are usually old.
+	var ignore atomic.Bool
+
+	go func() {
+		<-time.After(time.Second)
+		ignore.Store(false)
+	}()
+
+	go func() {
+		//nolint:errcheck
+		defer wr.res.Body.Close()
+
+		for {
+			// Read a line
+			b, err := reader.ReadBytes('\n')
+			if err != nil {
+				break
+			}
+
+			// Ignore for the first second
+			if ignore.Load() {
+				continue
+			}
+
+			// Send the event
+			var event Event
+			if err := json.Unmarshal(b, &event); err != nil {
+				continue
+			}
+			wr.results <- event
+		}
+
+		// stop the watcher
+		wr.Stop()
+	}()
+}
+
+// NewBodyWatcher creates a k8s body watcher for a given http request.
+func NewBodyWatcher(req *http.Request, client *http.Client) (Watch, error) {
+	ctx, cancel := context.WithCancel(context.Background())
+
+	req = req.WithContext(ctx)
+
+	//nolint:bodyclose
+	res, err := client.Do(req)
+	if err != nil {
+		cancel()
+		return nil, errors.Wrap(err, "body watcher failed to make http request")
+	}
+
+	wr := &bodyWatcher{
+		ctx:     ctx,
+		results: make(chan Event),
+		stop:    cancel,
+		req:     req,
+		res:     res,
+	}
+
+	go wr.stream()
+
+	return wr, nil
+}

vendor/github.com/go-micro/plugins/v4/registry/kubernetes/client/watch/watch.go

@@ -0,0 +1,27 @@
+// Package watch implements the k8s watcher.
+package watch
+
+import "encoding/json"
+
+// Watch ...
+type Watch interface {
+	Stop()
+	ResultChan() <-chan Event
+}
+
+// EventType defines the possible types of events.
+type EventType string
+
+// EventTypes used.
+const (
+	Added    EventType = "ADDED"
+	Modified EventType = "MODIFIED"
+	Deleted  EventType = "DELETED"
+	Error    EventType = "ERROR"
+)
+
+// Event represents a single event to a watched resource.
+type Event struct {
+	Type   EventType       `json:"type"`
+	Object json.RawMessage `json:"object"`
+}

vendor/github.com/go-micro/plugins/v4/registry/kubernetes/kubernetes.go

@@ -0,0 +1,321 @@
+// Package kubernetes provides a kubernetes registry
+package kubernetes
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+	"regexp"
+	"strings"
+	"time"
+
+	"go-micro.dev/v4/registry"
+	"go-micro.dev/v4/util/cmd"
+
+	"github.com/pkg/errors"
+
+	"github.com/go-micro/plugins/v4/registry/kubernetes/client"
+)
+
+type kregistry struct {
+	client  client.Kubernetes
+	timeout time.Duration
+	options registry.Options
+}
+
+var (
+	// used on pods as labels & services to select
+	// eg: svcSelectorPrefix+"svc.name"
+	svcSelectorPrefix = "micro.mu/selector-"
+	svcSelectorValue  = "service"
+
+	labelTypeKey          = "micro.mu/type"
+	labelTypeValueService = "service"
+
+	// used on k8s services to scope a serialized
+	// micro service by pod name.
+	annotationServiceKeyPrefix = "micro.mu/service-"
+
+	// Pod status.
+	podRunning = "Running"
+
+	// label name regex.
+	labelRe = regexp.MustCompilePOSIX("[-A-Za-z0-9_.]")
+)
+
+// Err are all package errors.
+var (
+	ErrNoHostname   = errors.New("failed to get podname from HOSTNAME variable")
+	ErrNoNodesFound = errors.New("you must provide at least one node")
+)
+
+// podSelector.
+var podSelector = map[string]string{
+	labelTypeKey: labelTypeValueService,
+}
+
+func init() {
+	cmd.DefaultRegistries["kubernetes"] = NewRegistry
+}
+
+func configure(k *kregistry, opts ...registry.Option) error {
+	for _, o := range opts {
+		o(&k.options)
+	}
+
+	// get first host
+	var host string
+	if len(k.options.Addrs) > 0 && len(k.options.Addrs[0]) > 0 {
+		host = k.options.Addrs[0]
+	}
+
+	if k.options.Timeout == 0 {
+		k.options.Timeout = time.Second * 1
+	}
+
+	// if no hosts setup, assume InCluster
+	var c client.Kubernetes
+	if len(host) == 0 {
+		c = client.NewClientInCluster()
+	} else {
+		c = client.NewClientByHost(host)
+	}
+
+	k.client = c
+	k.timeout = k.options.Timeout
+
+	return nil
+}
+
+// serviceName generates a valid service name for k8s labels.
+func serviceName(name string) string {
+	aname := make([]byte, len(name))
+
+	for i, r := range []byte(name) {
+		if !labelRe.Match([]byte{r}) {
+			aname[i] = '_'
+			continue
+		}
+
+		aname[i] = r
+	}
+
+	return string(aname)
+}
+
+// Init allows reconfig of options.
+func (c *kregistry) Init(opts ...registry.Option) error {
+	return configure(c, opts...)
+}
+
+// Options returns the registry Options.
+func (c *kregistry) Options() registry.Options {
+	return c.options
+}
+
+// Register sets a service selector label and an annotation with a
+// serialized version of the service passed in.
+func (c *kregistry) Register(s *registry.Service, opts ...registry.RegisterOption) error {
+	if len(s.Nodes) == 0 {
+		return ErrNoNodesFound
+	}
+
+	svcName := s.Name
+
+	// TODO: grab podname from somewhere better than this.
+	podName, err := getPodName()
+	if err != nil {
+		return errors.Wrap(err, "failed to register")
+	}
+
+	// encode micro service
+	b, err := json.Marshal(s)
+	if err != nil {
+		return err
+	}
+
+	svc := string(b)
+
+	pod := &client.Pod{
+		Metadata: &client.Meta{
+			Labels: map[string]*string{
+				labelTypeKey:                             &labelTypeValueService,
+				svcSelectorPrefix + serviceName(svcName): &svcSelectorValue,
+			},
+			Annotations: map[string]*string{
+				annotationServiceKeyPrefix + serviceName(svcName): &svc,
+			},
+		},
+	}
+
+	if _, err := c.client.UpdatePod(podName, pod); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// Deregister nils out any things set in Register.
+func (c *kregistry) Deregister(s *registry.Service, opts ...registry.DeregisterOption) error {
+	if len(s.Nodes) == 0 {
+		return ErrNoNodesFound
+	}
+
+	svcName := s.Name
+
+	// TODO: grab podname from somewhere better than env var.
+	podName, err := getPodName()
+	if err != nil {
+		return errors.Wrap(err, "failed to deregister")
+	}
+
+	pod := &client.Pod{
+		Metadata: &client.Meta{
+			Labels: map[string]*string{
+				svcSelectorPrefix + serviceName(svcName): nil,
+			},
+			Annotations: map[string]*string{
+				annotationServiceKeyPrefix + serviceName(svcName): nil,
+			},
+		},
+	}
+
+	if _, err := c.client.UpdatePod(podName, pod); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// GetService will get all the pods with the given service selector,
+// and build services from the annotations.
+func (c *kregistry) GetService(name string, opts ...registry.GetOption) ([]*registry.Service, error) {
+	pods, err := c.client.ListPods(map[string]string{
+		svcSelectorPrefix + serviceName(name): svcSelectorValue,
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	if len(pods.Items) == 0 {
+		return nil, registry.ErrNotFound
+	}
+
+	// svcs mapped by version
+	svcs := make(map[string]*registry.Service)
+
+	// loop through items
+	for _, pod := range pods.Items {
+		if pod.Status.Phase != podRunning || pod.Metadata.DeletionTimestamp != "" {
+			continue
+		}
+		// get serialized service from annotation
+		svcStr, ok := pod.Metadata.Annotations[annotationServiceKeyPrefix+serviceName(name)]
+		if !ok {
+			continue
+		}
+
+		var svc registry.Service
+
+		// unmarshal service string
+		err := json.Unmarshal([]byte(*svcStr), &svc)
+		if err != nil {
+			return nil, fmt.Errorf("could not unmarshal service '%s' from pod annotation", name)
+		}
+
+		// merge up pod service & ip with versioned service.
+		vs, ok := svcs[svc.Version]
+		if !ok {
+			svcs[svc.Version] = &svc
+			continue
+		}
+
+		vs.Nodes = append(vs.Nodes, svc.Nodes...)
+	}
+
+	list := make([]*registry.Service, 0, len(svcs))
+	for _, val := range svcs {
+		list = append(list, val)
+	}
+
+	return list, nil
+}
+
+// ListServices will list all the service names.
+func (c *kregistry) ListServices(opts ...registry.ListOption) ([]*registry.Service, error) {
+	pods, err := c.client.ListPods(podSelector)
+	if err != nil {
+		return nil, err
+	}
+
+	// svcs mapped by name+version
+	svcs := make(map[string]*registry.Service)
+
+	for _, pod := range pods.Items {
+		if pod.Status.Phase != podRunning || pod.Metadata.DeletionTimestamp != "" {
+			continue
+		}
+
+		for k, v := range pod.Metadata.Annotations {
+			if !strings.HasPrefix(k, annotationServiceKeyPrefix) {
+				continue
+			}
+
+			// we have to unmarshal the annotation itself since the
+			// key is encoded to match the regex restriction.
+			var svc registry.Service
+			if err := json.Unmarshal([]byte(*v), &svc); err != nil {
+				continue
+			}
+
+			s, ok := svcs[svc.Name+svc.Version]
+			if !ok {
+				svcs[svc.Name+svc.Version] = &svc
+				continue
+			}
+
+			// append to service:version nodes
+			s.Nodes = append(s.Nodes, svc.Nodes...)
+		}
+	}
+
+	i := 0
+	list := make([]*registry.Service, len(svcs))
+
+	for _, s := range svcs {
+		list[i] = s
+		i++
+	}
+
+	return list, nil
+}
+
+// Watch returns a kubernetes watcher.
+func (c *kregistry) Watch(opts ...registry.WatchOption) (registry.Watcher, error) {
+	return newWatcher(c, opts...)
+}
+
+func (c *kregistry) String() string {
+	return "kubernetes"
+}
+
+// NewRegistry creates a kubernetes registry.
+func NewRegistry(opts ...registry.Option) registry.Registry {
+	k := &kregistry{
+		options: registry.Options{},
+	}
+
+	//nolint:errcheck,gosec
+	configure(k, opts...)
+
+	return k
+}
+
+func getPodName() (string, error) {
+	podName := os.Getenv("HOSTNAME")
+	if len(podName) == 0 {
+		return "", ErrNoHostname
+	}
+
+	return podName, nil
+}

vendor/github.com/go-micro/plugins/v4/registry/kubernetes/watcher.go

@@ -0,0 +1,264 @@
+package kubernetes
+
+import (
+	"encoding/json"
+	"errors"
+	"strings"
+	"sync"
+
+	"go-micro.dev/v4/logger"
+	"go-micro.dev/v4/registry"
+
+	"github.com/go-micro/plugins/v4/registry/kubernetes/client"
+	"github.com/go-micro/plugins/v4/registry/kubernetes/client/watch"
+)
+
+var (
+	deleteAction = "delete"
+)
+
+type k8sWatcher struct {
+	registry *kregistry
+	watcher  watch.Watch
+	next     chan *registry.Result
+
+	sync.RWMutex
+	pods map[string]*client.Pod
+}
+
+// build a cache of pods when the watcher starts.
+func (k *k8sWatcher) updateCache() ([]*registry.Result, error) {
+	podList, err := k.registry.client.ListPods(podSelector)
+	if err != nil {
+		return nil, err
+	}
+
+	var results []*registry.Result
+
+	for _, p := range podList.Items {
+		// Copy to new var as p gets overwritten by the loop
+		pod := p
+		rslts := k.buildPodResults(&pod, nil)
+		results = append(results, rslts...)
+
+		k.Lock()
+		k.pods[pod.Metadata.Name] = &pod
+		k.Unlock()
+	}
+
+	return results, nil
+}
+
+// look through pod annotations, compare against cache if present
+// and return a list of results to send down the wire.
+func (k *k8sWatcher) buildPodResults(pod *client.Pod, cache *client.Pod) []*registry.Result {
+	var results []*registry.Result
+
+	ignore := make(map[string]bool)
+
+	if pod.Metadata != nil {
+		results, ignore = podBuildResult(pod, cache)
+	}
+
+	// loop through cache annotations to find services
+	// not accounted for above, and "delete" them.
+	if cache != nil && cache.Metadata != nil {
+		for annKey, annVal := range cache.Metadata.Annotations {
+			if ignore[annKey] {
+				continue
+			}
+
+			// check this annotation kv is a service notation
+			if !strings.HasPrefix(annKey, annotationServiceKeyPrefix) {
+				continue
+			}
+
+			rslt := &registry.Result{Action: deleteAction}
+
+			// unmarshal service notation from annotation value
+			if err := json.Unmarshal([]byte(*annVal), &rslt.Service); err != nil {
+				continue
+			}
+
+			results = append(results, rslt)
+		}
+	}
+
+	return results
+}
+
+// handleEvent will taken an event from the k8s pods API and do the correct
+// things with the result, based on the local cache.
+func (k *k8sWatcher) handleEvent(event watch.Event) {
+	var pod client.Pod
+	if err := json.Unmarshal([]byte(event.Object), &pod); err != nil {
+		logger.Error("K8s Watcher: Couldnt unmarshal event object from pod")
+		return
+	}
+
+	//nolint:exhaustive
+	switch event.Type {
+	// Pod was modified
+	case watch.Modified:
+		k.RLock()
+		cache := k.pods[pod.Metadata.Name]
+		k.RUnlock()
+
+		// service could have been added, edited or removed.
+		var results []*registry.Result
+
+		if pod.Status.Phase == podRunning {
+			results = k.buildPodResults(&pod, cache)
+		} else {
+			// passing in cache might not return all results
+			results = k.buildPodResults(&pod, nil)
+		}
+
+		for _, result := range results {
+			// pod isnt running
+			if pod.Status.Phase != podRunning || pod.Metadata.DeletionTimestamp != "" {
+				result.Action = deleteAction
+			}
+			k.next <- result
+		}
+
+		k.Lock()
+		k.pods[pod.Metadata.Name] = &pod
+		k.Unlock()
+
+		return
+
+	// Pod was deleted
+	// passing in cache might not return all results
+	case watch.Deleted:
+		results := k.buildPodResults(&pod, nil)
+
+		for _, result := range results {
+			result.Action = deleteAction
+			k.next <- result
+		}
+
+		k.Lock()
+		delete(k.pods, pod.Metadata.Name)
+		k.Unlock()
+
+		return
+	}
+}
+
+// Next will block until a new result comes in.
+func (k *k8sWatcher) Next() (*registry.Result, error) {
+	r, ok := <-k.next
+	if !ok {
+		return nil, errors.New("result chan closed")
+	}
+
+	return r, nil
+}
+
+// Stop will cancel any requests, and close channels.
+func (k *k8sWatcher) Stop() {
+	k.watcher.Stop()
+
+	select {
+	case <-k.next:
+		return
+	default:
+		close(k.next)
+	}
+}
+
+func newWatcher(kr *kregistry, opts ...registry.WatchOption) (registry.Watcher, error) {
+	var wo registry.WatchOptions
+	for _, o := range opts {
+		o(&wo)
+	}
+
+	selector := podSelector
+	if len(wo.Service) > 0 {
+		selector = map[string]string{
+			svcSelectorPrefix + serviceName(wo.Service): svcSelectorValue,
+		}
+	}
+
+	// Create watch request
+	watcher, err := kr.client.WatchPods(selector)
+	if err != nil {
+		return nil, err
+	}
+
+	k := &k8sWatcher{
+		registry: kr,
+		watcher:  watcher,
+		next:     make(chan *registry.Result),
+		pods:     make(map[string]*client.Pod),
+	}
+
+	// update cache, but dont emit changes
+	if _, err := k.updateCache(); err != nil {
+		return nil, err
+	}
+
+	// range over watch request changes, and invoke
+	// the update event
+	go func() {
+		for event := range watcher.ResultChan() {
+			k.handleEvent(event)
+		}
+
+		k.Stop()
+	}()
+
+	return k, nil
+}
+
+func podBuildResult(pod *client.Pod, cache *client.Pod) ([]*registry.Result, map[string]bool) {
+	results := make([]*registry.Result, 0, len(pod.Metadata.Annotations))
+	ignore := make(map[string]bool)
+
+	for annKey, annVal := range pod.Metadata.Annotations {
+		// check this annotation kv is a service notation
+		if !strings.HasPrefix(annKey, annotationServiceKeyPrefix) {
+			continue
+		}
+
+		if annVal == nil {
+			continue
+		}
+
+		// ignore when we check the cached annotations
+		// as we take care of it here
+		ignore[annKey] = true
+
+		// compare against cache.
+		var (
+			cacheExists bool
+			cav         *string
+		)
+
+		if cache != nil && cache.Metadata != nil {
+			cav, cacheExists = cache.Metadata.Annotations[annKey]
+			if cacheExists && cav != nil && cav == annVal {
+				// service notation exists and is identical -
+				// no change result required.
+				continue
+			}
+		}
+
+		rslt := &registry.Result{}
+		if cacheExists {
+			rslt.Action = "update"
+		} else {
+			rslt.Action = "create"
+		}
+
+		// unmarshal service notation from annotation value
+		if err := json.Unmarshal([]byte(*annVal), &rslt.Service); err != nil {
+			continue
+		}
+
+		results = append(results, rslt)
+	}
+
+	return results, ignore
+}