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

tools/pq/cli/backend.go

@@ -0,0 +1,32 @@
+package cli
+
+import (
+	"context"
+
+	"github.com/pkg/errors"
+)
+
+type BackendConfig struct {
+	Topic    string
+	RawTopic string
+}
+
+func (c BackendConfig) Validate() error {
+	if c.Topic == "" && c.RawTopic == "" {
+		return errors.New("topic or raw topic must be provided")
+	}
+
+	if c.Topic != "" && c.RawTopic != "" {
+		return errors.New("only one of topic or raw topic must be provided")
+	}
+
+	return nil
+}
+
+type BackendConstructor func(ctx context.Context, cfg BackendConfig) (Backend, error)
+
+type Backend interface {
+	AllMessages(ctx context.Context) ([]Message, error)
+	Requeue(ctx context.Context, msg Message) error
+	Ack(ctx context.Context, msg Message) error
+}