Kubernetes Router (#2036)

router/kubernetes/kubernetes.go

@@ -0,0 +1,113 @@
+// Package kubernetes is a kubernetes router which uses the service name and network to route
+package kubernetes
+
+import (
+	"fmt"
+
+	"github.com/micro/go-micro/v3/router"
+)
+
+// NewRouter returns an initialized kubernetes router
+func NewRouter(opts ...router.Option) router.Router {
+	options := router.DefaultOptions()
+	for _, o := range opts {
+		o(&options)
+	}
+	return &kubernetes{options}
+}
+
+type kubernetes struct {
+	options router.Options
+}
+
+func (k *kubernetes) Init(opts ...router.Option) error {
+	for _, o := range opts {
+		o(&k.options)
+	}
+	return nil
+}
+
+func (k *kubernetes) Options() router.Options {
+	return k.options
+}
+
+func (k *kubernetes) Table() router.Table {
+	return new(table)
+}
+
+func (k *kubernetes) Lookup(service string, opts ...router.LookupOption) ([]router.Route, error) {
+	options := router.NewLookup(opts...)
+	if len(options.Network) == 0 {
+		options.Network = "micro"
+	}
+
+	address := fmt.Sprintf("%v.%v.svc.cluster.local:8080", service, options.Network)
+
+	return []router.Route{
+		router.Route{
+			Service: service,
+			Address: address,
+			Gateway: options.Gateway,
+			Network: options.Network,
+			Router:  options.Router,
+		},
+	}, nil
+}
+
+// Watch will return a noop watcher
+func (k *kubernetes) Watch(opts ...router.WatchOption) (router.Watcher, error) {
+	return &watcher{
+		events: make(chan *router.Event),
+	}, nil
+}
+
+func (k *kubernetes) Close() error {
+	return nil
+}
+
+func (k *kubernetes) String() string {
+	return "kubernetes"
+}
+
+// watcher is a noop implementation
+type watcher struct {
+	events chan *router.Event
+}
+
+// Next is a blocking call that returns watch result
+func (w *watcher) Next() (*router.Event, error) {
+	e := <-w.events
+	return e, nil
+}
+
+// Chan returns event channel
+func (w *watcher) Chan() (<-chan *router.Event, error) {
+	return w.events, nil
+}
+
+// Stop stops watcher
+func (w *watcher) Stop() {
+	return
+}
+
+type table struct{}
+
+// Create new route in the routing table
+func (t *table) Create(router.Route) error {
+	return nil
+}
+
+// Delete existing route from the routing table
+func (t *table) Delete(router.Route) error {
+	return nil
+}
+
+// Update route in the routing table
+func (t *table) Update(router.Route) error {
+	return nil
+}
+
+// Read is for querying the table
+func (t *table) Read(...router.ReadOption) ([]router.Route, error) {
+	return []router.Route{}, nil
+}