1 files changed, 47 insertions, 0 deletions
diff --git a/internal/praefect/walkrepos.go b/internal/praefect/walkrepos.go
new file mode 100644
index 000000000..1f321a4c7
--- /dev/null
+++ b/internal/praefect/walkrepos.go
@@ -0,0 +1,47 @@
+package praefect
+
+import (
+	"fmt"
+
+	"gitlab.com/gitlab-org/gitaly/v16/internal/gitaly/storage"
+	"gitlab.com/gitlab-org/gitaly/v16/internal/praefect/datastore"
+	"gitlab.com/gitlab-org/gitaly/v16/internal/structerr"
+	"gitlab.com/gitlab-org/gitaly/v16/proto/go/gitalypb"
+	"google.golang.org/grpc"
+)
+
+// WalkReposHandler implements an interceptor for the WalkRepos RPC, invoked when calling
+// through Praefect. Instead of walking the storage directory in the filesystem, this Praefect
+// implementation queries the database for all known repositories in the given virtual storage.
+// As a consequence, the modification_time parameter can't be populated in the response.
+func WalkReposHandler(rs datastore.RepositoryStore) grpc.StreamHandler {
+	return func(srv interface{}, stream grpc.ServerStream) error {
+		sendRepo := func(relPath string) error {
+			return stream.SendMsg(&gitalypb.WalkReposResponse{
+				RelativePath: relPath,
+			})
+		}
+
+		var req gitalypb.WalkReposRequest
+		if err := stream.RecvMsg(&req); err != nil {
+			return fmt.Errorf("receive request: %w", err)
+		}
+
+		if req.StorageName == "" {
+			return structerr.NewInvalidArgument("%w", storage.ErrStorageNotSet)
+		}
+
+		repos, err := rs.ListRepositoryPaths(stream.Context(), req.StorageName)
+		if err != nil {
+			return structerr.NewInternal("list repository paths: %w", err)
+		}
+
+		for _, repo := range repos {
+			if err := sendRepo(repo); err != nil {
+				return structerr.NewInternal("send repository path: %w", err)
+			}
+		}
+
+		return nil
+	}
+}