expose BulkExportRelationships service controller logic

so that it can be used without the grpc server

pkg/services/v1/services.go

@@ -0,0 +1,17 @@
+package v1
+
+import (
+	"context"
+
+	v1 "github.com/authzed/authzed-go/proto/authzed/api/v1"
+
+	servicesv1 "github.com/authzed/spicedb/internal/services/v1"
+	"github.com/authzed/spicedb/pkg/datastore"
+)
+
+// BulkExport implements the BulkExportRelationships API functionality. Given a datastore.Datastore, it will
+// export stream via the sender all relationships matched by the incoming request.
+// If no cursor is provided, it will fallback to the provided revision.
+func BulkExport(ctx context.Context, ds datastore.Datastore, batchSize uint64, req *v1.BulkExportRelationshipsRequest, fallbackRevision datastore.Revision, sender func(response *v1.BulkExportRelationshipsResponse) error) error {
+	return servicesv1.BulkExport(ctx, ds, batchSize, req, fallbackRevision, sender)
+}