feat: exporter api, json exporter

internal/adapters/json/json.go

@@ -0,0 +1,34 @@
+package json
+
+import (
+	"context"
+	"encoding/json"
+	"github.com/abelith/spellbook/internal/adapters/exporter"
+	"github.com/abelith/spellbook/internal/models"
+	"io"
+)
+
+func init() {
+	exporter.Register("jsonl", &JsonlExporter{})
+}
+
+type JsonlExporter struct{}
+
+func (je *JsonlExporter) Export(ctx context.Context, ch <-chan models.Spell, w io.Writer) error {
+	encoder := json.NewEncoder(w)
+
+	for {
+		select {
+		case <-ctx.Done():
+			return ctx.Err()
+		case spell, ok := <-ch:
+			if !ok {
+				return nil
+			}
+
+			if err := encoder.Encode(&spell); err != nil {
+				return err
+			}
+		}
+	}
+}