snapshot of https://github.com/ThreeDotsLabs/watermill.git (master, 2026-09-15; blobs > 131072B omitted)

_examples/pubsubs/sqlite-zombiezen/main.go

@@ -0,0 +1,70 @@
+// Sources for https://watermill.io/docs/getting-started/
+package main
+
+import (
+	"context"
+	"log"
+	"time"
+
+	"github.com/ThreeDotsLabs/watermill"
+	"github.com/ThreeDotsLabs/watermill-sqlite/wmsqlitezombiezen"
+	"github.com/ThreeDotsLabs/watermill/message"
+	_ "modernc.org/sqlite"
+	"zombiezen.com/go/sqlite"
+)
+
+func main() {
+	logger := watermill.NewStdLogger(false, false)
+
+	// &cache=shared is critical, see: https://github.com/zombiezen/go-sqlite/issues/92#issuecomment-2052330643
+	// connectionDSN := "file:db.sqlite3?journal_mode=WAL&busy_timeout=1000&secure_delete=true&foreign_keys=true&cache=shared"
+	connectionDSN := "file:ephemeral?mode=memory&cache=shared"
+	conn, err := sqlite.OpenConn(connectionDSN)
+	if err != nil {
+		panic(err)
+	}
+	defer conn.Close()
+
+	publisher, err := wmsqlitezombiezen.NewPublisher(conn, wmsqlitezombiezen.PublisherOptions{
+		InitializeSchema: true,
+		Logger:           logger,
+	})
+	if err != nil {
+		panic(err)
+	}
+
+	subscriber, err := wmsqlitezombiezen.NewSubscriber(connectionDSN, wmsqlitezombiezen.SubscriberOptions{
+		InitializeSchema: true,
+		Logger:           logger,
+	})
+	if err != nil {
+		panic(err)
+	}
+
+	messages, err := subscriber.Subscribe(context.Background(), "example_topic")
+	if err != nil {
+		panic(err)
+	}
+
+	go process(messages)
+	publishMessages(publisher)
+}
+
+func publishMessages(publisher message.Publisher) {
+	for {
+		msg := message.NewMessage(watermill.NewUUID(), []byte(`{"message": "Hello from ZombieZen!"}`))
+
+		if err := publisher.Publish("example_topic", msg); err != nil {
+			panic(err)
+		}
+
+		time.Sleep(time.Second)
+	}
+}
+
+func process(messages <-chan *message.Message) {
+	for msg := range messages {
+		log.Printf("ZombieZen received message: %s, payload: %s", msg.UUID, string(msg.Payload))
+		msg.Ack()
+	}
+}