1 files changed, 52 insertions, 0 deletions
diff --git a/tvix/castore/protos/rpc_blobstore.proto b/tvix/castore/protos/rpc_blobstore.proto
new file mode 100644
index 0000000000..6ee9a80f0a
--- /dev/null
+++ b/tvix/castore/protos/rpc_blobstore.proto
@@ -0,0 +1,52 @@
+// SPDX-License-Identifier: MIT
+// Copyright © 2022 The Tvix Authors
+syntax = "proto3";
+
+package tvix.castore.v1;
+
+option go_package = "code.tvl.fyi/tvix/castore/protos;castorev1";
+
+service BlobService {
+    // In the future, Stat will expose more metadata about a given blob,
+    // such as more granular chunking, baos.
+    // For now, it's only used to check for the existence of a blob, as asking
+    // this for a non-existing Blob will return a Status::not_found gRPC error.
+    rpc Stat(StatBlobRequest) returns (BlobMeta);
+
+    // Read returns a stream of BlobChunk, which is just a stream of bytes with
+    // the digest specified in ReadBlobRequest.
+    //
+    // The server may decide on whatever chunking it may seem fit as a size for
+    // the individual BlobChunk sent in the response stream.
+    rpc Read(ReadBlobRequest) returns (stream BlobChunk);
+
+    // Put uploads a Blob, by reading a stream of bytes.
+    //
+    // The way the data is chunked up in individual BlobChunk messages sent in
+    // the stream has no effect on how the server ends up chunking blobs up.
+    rpc Put(stream BlobChunk) returns (PutBlobResponse);
+}
+
+message StatBlobRequest {
+    // The blake3 digest of the blob requested
+    bytes digest = 1;
+}
+
+message BlobMeta {
+}
+
+message ReadBlobRequest {
+    // The blake3 digest of the blob or chunk requested
+    bytes digest = 1;
+}
+
+// This represents some bytes of a blob.
+// Blobs are sent in smaller chunks to keep message sizes manageable.
+message BlobChunk {
+    bytes data = 1;
+}
+
+message PutBlobResponse {
+    // The blake3 digest of the data that was sent.
+    bytes digest = 1;
+}