feat: game lobby service

lobby/internal/adapters/metricsintentpub/publisher.go

@@ -0,0 +1,44 @@
+// Package metricsintentpub wraps a ports.IntentPublisher with the
+// `lobby.notification.publish_attempts` counter from
+// `lobby/README.md` §Observability.
+package metricsintentpub
+
+import (
+	"context"
+
+	"galaxy/lobby/internal/ports"
+	"galaxy/lobby/internal/telemetry"
+	"galaxy/notificationintent"
+)
+
+// Publisher decorates an inner ports.IntentPublisher and increments
+// `lobby.notification.publish_attempts` after each call.
+type Publisher struct {
+	inner     ports.IntentPublisher
+	telemetry *telemetry.Runtime
+}
+
+// New constructs one Publisher around inner. When telemetryRuntime is nil,
+// the wrapper still delegates Publish but does not record metrics.
+func New(inner ports.IntentPublisher, telemetryRuntime *telemetry.Runtime) *Publisher {
+	return &Publisher{inner: inner, telemetry: telemetryRuntime}
+}
+
+// Publish forwards intent to the inner publisher and records the attempt
+// outcome under the frozen `result` attribute (`ok`/`error`).
+func (publisher *Publisher) Publish(ctx context.Context, intent notificationintent.Intent) (string, error) {
+	if publisher == nil || publisher.inner == nil {
+		return "", nil
+	}
+
+	id, err := publisher.inner.Publish(ctx, intent)
+	result := "ok"
+	if err != nil {
+		result = "error"
+	}
+	publisher.telemetry.RecordNotificationPublish(ctx, string(intent.NotificationType), result)
+	return id, err
+}
+
+// Compile-time interface assertion.
+var _ ports.IntentPublisher = (*Publisher)(nil)