feat: initial scaffold of unibus message bus (membership service + client lib + demo peers)

2026-06-03 19:47:32 +02:00
commit cd02a52191
22 changed files with 2888 additions and 0 deletions
@@ -0,0 +1,71 @@
+// Command worker is a demo peer: it creates (or joins) a cleartext room and
+// publishes an incrementing counter once per second, to both stdout and the
+// bus. It demonstrates that a process is a first-class bus peer, uniform with
+// the human chat client.
+package main
+
+import (
+	"flag"
+	"fmt"
+	"log"
+	"os"
+	"os/signal"
+	"syscall"
+	"time"
+
+	"github.com/enmanuel/unibus/pkg/client"
+	"github.com/enmanuel/unibus/pkg/room"
+)
+
+func main() {
+	var (
+		natsURL = flag.String("nats-url", "nats://127.0.0.1:4222", "NATS url")
+		ctrlURL = flag.String("ctrl-url", "http://127.0.0.1:8420", "membershipd control-plane url")
+		roomSub = flag.String("room", "proc.test.ticks", "room subject to publish to")
+		idFile  = flag.String("id-file", "./local_files/worker.id", "identity file path")
+	)
+	flag.Parse()
+
+	log.SetFlags(log.LstdFlags | log.Lmsgprefix)
+	log.SetPrefix("[worker] ")
+
+	id, err := client.LoadOrCreateIdentity(*idFile)
+	if err != nil {
+		log.Fatalf("identity: %v", err)
+	}
+	c, err := client.New(*natsURL, *ctrlURL, id)
+	if err != nil {
+		log.Fatalf("connect: %v", err)
+	}
+	defer c.Close()
+	log.Printf("endpoint: %s", c.Endpoint().ID)
+
+	// Create the room; if it already exists we cannot recreate it under a known
+	// id (rooms get fresh ULIDs), so for the demo each worker run owns its room.
+	roomID, err := c.CreateRoom(*roomSub, room.ModeNATS)
+	if err != nil {
+		log.Fatalf("create room: %v", err)
+	}
+	log.Printf("room %q -> %s (subject %s, cleartext)", *roomSub, roomID, *roomSub)
+
+	stop := make(chan os.Signal, 1)
+	signal.Notify(stop, syscall.SIGINT, syscall.SIGTERM)
+
+	ticker := time.NewTicker(1 * time.Second)
+	defer ticker.Stop()
+	n := 0
+	for {
+		select {
+		case <-ticker.C:
+			n++
+			payload := fmt.Sprintf("tick %d @ %s", n, time.Now().UTC().Format(time.RFC3339))
+			fmt.Println(payload)
+			if err := c.Publish(roomID, []byte(payload)); err != nil {
+				log.Printf("publish: %v", err)
+			}
+		case <-stop:
+			log.Printf("stopping after %d ticks", n)
+			return
+		}
+	}
+}