refactor discovery

cmd/order/main.go

@@ -27,6 +27,7 @@ import (
 	"git.k6n.net/mats/go-cart-actor/pkg/order"
 	ordermcp "git.k6n.net/mats/go-cart-actor/pkg/order/mcp"
 	"git.k6n.net/mats/go-cart-actor/pkg/outbox"
+	"git.k6n.net/mats/go-cart-actor/pkg/proxy"
 	messages "git.k6n.net/mats/go-cart-actor/proto/order"
 	"git.k6n.net/mats/platform/config"
 	"git.k6n.net/mats/platform/rabbit"
@@ -36,6 +37,9 @@ import (
 	"google.golang.org/protobuf/proto"
 )
 
+var podIp = os.Getenv("POD_IP")
+var name = os.Getenv("POD_NAME")
+
 type server struct {
 	pool                  *actor.SimpleGrainPool[order.OrderGrain]
 	applier               *orderedApplier
@@ -66,8 +70,13 @@ func main() {
 	order.RegisterMutations(reg)
 	storage := actor.NewDiskStorage[order.OrderGrain](dataDir, reg)
 
+	hostname := podIp
+	if hostname == "" {
+		hostname = "order-1"
+	}
+
 	pool, err := actor.NewSimpleGrainPool(actor.GrainPoolConfig[order.OrderGrain]{
-		Hostname: "order-1",
+		Hostname: hostname,
 		Spawn: func(ctx context.Context, id uint64) (actor.Grain[order.OrderGrain], error) {
 			g := order.NewOrderGrain(id, time.Now())
 			// Replay any persisted history so the resident grain is current.
@@ -76,8 +85,8 @@ func main() {
 			}
 			return g, nil
 		},
-		SpawnHost: func(string) (actor.Host[order.OrderGrain], error) {
-			return nil, fmt.Errorf("order service is single-node")
+		SpawnHost: func(host string) (actor.Host[order.OrderGrain], error) {
+			return proxy.NewRemoteHost[order.OrderGrain](host)
 		},
 		Destroy:  func(actor.Grain[order.OrderGrain]) error { return nil },
 		TTL:      time.Hour,
@@ -95,6 +104,15 @@ func main() {
 		log.Fatalf("create pool: %v", err)
 	}
 
+	controlPlaneConfig := actor.DefaultServerConfig()
+	grpcSrv, err := actor.NewControlServer[order.OrderGrain](controlPlaneConfig, pool)
+	if err != nil {
+		log.Fatalf("Error starting control plane gRPC server: %v\n", err)
+	}
+	defer grpcSrv.GracefulStop()
+
+	UseDiscovery(pool)
+
 	applier := &orderedApplier{pool: pool, storage: storage}
 	provider := selectProvider(logger)