chore(tvix/store/protos): add PathInfoService::CalculateNAR() r/5525

Expose the NAR calculation to a separate `CalculateNAR` method, which
responds with the NAR size and sha256 hash.

Contrary to what cl/7618 and cl/7620 initially did, don't add different
other request types.

In the CalculateNARResponse message, there's now some duplication in the
(optional) `narinfo` field of a PathInfo, but I'm not entirely sure if
we want to drop the fields from there yet.

Change-Id: Id797c56e17efedac115fbd43de9dfde9fa1db140
Reviewed-on: https://cl.tvl.fyi/c/depot/+/7663
Reviewed-by: tazjin <tazjin@tvl.su>
Tested-by: BuildkiteCI

3 files changed, 222 insertions, 39 deletions

diff --git a/tvix/store/protos/rpc_pathinfo.pb.go b/tvix/store/protos/rpc_pathinfo.pb.go
index f535dab56a..0b05f2a70c 100644
--- a/tvix/store/protos/rpc_pathinfo.pb.go
+++ b/tvix/store/protos/rpc_pathinfo.pb.go
@@ -97,6 +97,67 @@ type GetPathInfoRequest_ByOutputHash struct {
 
 func (*GetPathInfoRequest_ByOutputHash) isGetPathInfoRequest_ByWhat() {}
 
+// CalculateNARResponse is the response returned by the CalculateNAR request.
+//
+// It contains the size of the NAR representation (in bytes), and the sha56
+// digest.
+type CalculateNARResponse struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// This size of the NAR file, in bytes.
+	NarSize uint32 `protobuf:"varint,1,opt,name=nar_size,json=narSize,proto3" json:"nar_size,omitempty"`
+	// The sha256 of the NAR file representation.
+	NarSha256 []byte `protobuf:"bytes,2,opt,name=nar_sha256,json=narSha256,proto3" json:"nar_sha256,omitempty"`
+}
+
+func (x *CalculateNARResponse) Reset() {
+	*x = CalculateNARResponse{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_tvix_store_protos_rpc_pathinfo_proto_msgTypes[1]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *CalculateNARResponse) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*CalculateNARResponse) ProtoMessage() {}
+
+func (x *CalculateNARResponse) ProtoReflect() protoreflect.Message {
+	mi := &file_tvix_store_protos_rpc_pathinfo_proto_msgTypes[1]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use CalculateNARResponse.ProtoReflect.Descriptor instead.
+func (*CalculateNARResponse) Descriptor() ([]byte, []int) {
+	return file_tvix_store_protos_rpc_pathinfo_proto_rawDescGZIP(), []int{1}
+}
+
+func (x *CalculateNARResponse) GetNarSize() uint32 {
+	if x != nil {
+		return x.NarSize
+	}
+	return 0
+}
+
+func (x *CalculateNARResponse) GetNarSha256() []byte {
+	if x != nil {
+		return x.NarSha256
+	}
+	return nil
+}
+
 var File_tvix_store_protos_rpc_pathinfo_proto protoreflect.FileDescriptor
 
 var file_tvix_store_protos_rpc_pathinfo_proto_rawDesc = []byte{
@@ -110,19 +171,28 @@ var file_tvix_store_protos_rpc_pathinfo_proto_rawDesc = []byte{
 	0x0e, 0x62, 0x79, 0x5f, 0x6f, 0x75, 0x74, 0x70, 0x75, 0x74, 0x5f, 0x68, 0x61, 0x73, 0x68, 0x18,
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+	0x74, 0x6f, 0x72, 0x65, 0x76, 0x31, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
@@ -137,18 +207,22 @@ func file_tvix_store_protos_rpc_pathinfo_proto_rawDescGZIP() []byte {
 	return file_tvix_store_protos_rpc_pathinfo_proto_rawDescData
 }
 
-var file_tvix_store_protos_rpc_pathinfo_proto_msgTypes = make([]protoimpl.MessageInfo, 1)
+var file_tvix_store_protos_rpc_pathinfo_proto_msgTypes = make([]protoimpl.MessageInfo, 2)
 var file_tvix_store_protos_rpc_pathinfo_proto_goTypes = []interface{}{
-	(*GetPathInfoRequest)(nil), // 0: tvix.store.v1.GetPathInfoRequest
-	(*PathInfo)(nil),           // 1: tvix.store.v1.PathInfo
+	(*GetPathInfoRequest)(nil),   // 0: tvix.store.v1.GetPathInfoRequest
+	(*CalculateNARResponse)(nil), // 1: tvix.store.v1.CalculateNARResponse
+	(*PathInfo)(nil),             // 2: tvix.store.v1.PathInfo
+	(*Node)(nil),                 // 3: tvix.store.v1.Node
 }
 var file_tvix_store_protos_rpc_pathinfo_proto_depIdxs = []int32{
 	0, // 0: tvix.store.v1.PathInfoService.Get:input_type -> tvix.store.v1.GetPathInfoRequest
-	1, // 1: tvix.store.v1.PathInfoService.Put:input_type -> tvix.store.v1.PathInfo
-	1, // 2: tvix.store.v1.PathInfoService.Get:output_type -> tvix.store.v1.PathInfo
-	1, // 3: tvix.store.v1.PathInfoService.Put:output_type -> tvix.store.v1.PathInfo
-	2, // [2:4] is the sub-list for method output_type
-	0, // [0:2] is the sub-list for method input_type
+	2, // 1: tvix.store.v1.PathInfoService.Put:input_type -> tvix.store.v1.PathInfo
+	3, // 2: tvix.store.v1.PathInfoService.CalculateNAR:input_type -> tvix.store.v1.Node
+	2, // 3: tvix.store.v1.PathInfoService.Get:output_type -> tvix.store.v1.PathInfo
+	2, // 4: tvix.store.v1.PathInfoService.Put:output_type -> tvix.store.v1.PathInfo
+	1, // 5: tvix.store.v1.PathInfoService.CalculateNAR:output_type -> tvix.store.v1.CalculateNARResponse
+	3, // [3:6] is the sub-list for method output_type
+	0, // [0:3] is the sub-list for method input_type
 	0, // [0:0] is the sub-list for extension type_name
 	0, // [0:0] is the sub-list for extension extendee
 	0, // [0:0] is the sub-list for field type_name
@@ -173,6 +247,18 @@ func file_tvix_store_protos_rpc_pathinfo_proto_init() {
 				return nil
 			}
 		}
+		file_tvix_store_protos_rpc_pathinfo_proto_msgTypes[1].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*CalculateNARResponse); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
 	}
 	file_tvix_store_protos_rpc_pathinfo_proto_msgTypes[0].OneofWrappers = []interface{}{
 		(*GetPathInfoRequest_ByOutputHash)(nil),
@@ -183,7 +269,7 @@ func file_tvix_store_protos_rpc_pathinfo_proto_init() {
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_tvix_store_protos_rpc_pathinfo_proto_rawDesc,
 			NumEnums:      0,
-			NumMessages:   1,
+			NumMessages:   2,
 			NumExtensions: 0,
 			NumServices:   1,
 		},
diff --git a/tvix/store/protos/rpc_pathinfo.proto b/tvix/store/protos/rpc_pathinfo.proto
index f9710f5722..f37794c291 100644
--- a/tvix/store/protos/rpc_pathinfo.proto
+++ b/tvix/store/protos/rpc_pathinfo.proto
@@ -9,23 +9,42 @@ import "tvix/store/protos/pathinfo.proto";
 option go_package = "code.tvl.fyi/tvix/store/protos;storev1";
 
 service PathInfoService {
-    // Get retrieves a PathInfo object, by using the lookup parameters in
-    // GetPathInfoRequest.
-    // If the PathInfo object contains a DirectoryNode, it needs to be looked
-    // up separately via the DirectoryService, which is purely
-    // content-addressed.
+    // Return a PathInfo message, identified by the decoded nixbase32 part
+    // of a Nix output path.
+    //
+    // To substitute /nix/store/xm35nga2g20mz5sm5l6n8v3bdm86yj83-
+    // cowsay-3.04 the bytes in the request would be
+    // nixbase32dec("xm35nga2g20mz5sm5l6n8v3bdm86yj83").
     rpc Get(GetPathInfoRequest) returns (PathInfo);
 
     // Put uploads a PathInfo object to the remote end. It MUST not return
     // until the PathInfo object has been written on the the remote end.
+    //
     // The remote end MAY check if a potential DirectoryNode has already been
     // uploaded.
+    //
     // Uploading clients SHOULD obviously not steer other machines to try to
     // substitute before from the remote end before having finished uploading
     // PathInfo, Directories and Blobs.
     // The returned PathInfo object MAY contain additional narinfo signatures,
     // but is otherwise left untouched.
     rpc Put(PathInfo) returns (PathInfo);
+
+
+    // Calculate the NAR representation of the contents specified by the
+    // root_node. The calculation SHOULD be cached server-side for subsequent
+    // requests.
+    //
+    // All references (to blobs or Directory messages) MUST already exist in
+    // the store.
+    //
+    // The method can be used to produce a Nix fixed-output path, which
+    // contains the (compressed) sha256 of the NAR content representation in
+    // the root_node name (suffixed with the name).
+    //
+    // It can also be used to calculate arbitrary NAR hashes of output paths,
+    // in case a legacy Nix Binary Cache frontend is provided.
+    rpc CalculateNAR(Node) returns (CalculateNARResponse);
 }
 
 // GetPathInfoRequest describes the lookup parameters that can be used to
@@ -38,7 +57,17 @@ message GetPathInfoRequest {
       // /nix/store/xm35nga2g20mz5sm5l6n8v3bdm86yj83-cowsay-3.04
       // this field would contain nixbase32dec("xm35nga2g20mz5sm5l6n8v3bdm86yj83").
       bytes by_output_hash = 1;
+    };
+}
+
+// CalculateNARResponse is the response returned by the CalculateNAR request.
+//
+// It contains the size of the NAR representation (in bytes), and the sha56
+// digest.
+message CalculateNARResponse {
+    // This size of the NAR file, in bytes.
+    uint32 nar_size = 1;
 
-      // placeholder: by_drv and output name?
-    }
+    // The sha256 of the NAR file representation.
+    bytes nar_sha256 = 2;
 }
diff --git a/tvix/store/protos/rpc_pathinfo_grpc.pb.go b/tvix/store/protos/rpc_pathinfo_grpc.pb.go
index b94d24dc5b..a69820e358 100644
--- a/tvix/store/protos/rpc_pathinfo_grpc.pb.go
+++ b/tvix/store/protos/rpc_pathinfo_grpc.pb.go
@@ -22,22 +22,39 @@ const _ = grpc.SupportPackageIsVersion7
 //
 // For semantics around ctx use and closing/ending streaming RPCs, please refer to https://pkg.go.dev/google.golang.org/grpc/?tab=doc#ClientConn.NewStream.
 type PathInfoServiceClient interface {
-	// Get retrieves a PathInfo object, by using the lookup parameters in
-	// GetPathInfoRequest.
-	// If the PathInfo object contains a DirectoryNode, it needs to be looked
-	// up separately via the DirectoryService, which is purely
-	// content-addressed.
+	// Return a PathInfo message, identified by the decoded nixbase32 part
+	// of a Nix output path.
+	//
+	// To substitute /nix/store/xm35nga2g20mz5sm5l6n8v3bdm86yj83-
+	// cowsay-3.04 the bytes in the request would be
+	// nixbase32dec("xm35nga2g20mz5sm5l6n8v3bdm86yj83").
 	Get(ctx context.Context, in *GetPathInfoRequest, opts ...grpc.CallOption) (*PathInfo, error)
 	// Put uploads a PathInfo object to the remote end. It MUST not return
 	// until the PathInfo object has been written on the the remote end.
+	//
 	// The remote end MAY check if a potential DirectoryNode has already been
 	// uploaded.
+	//
 	// Uploading clients SHOULD obviously not steer other machines to try to
 	// substitute before from the remote end before having finished uploading
 	// PathInfo, Directories and Blobs.
 	// The returned PathInfo object MAY contain additional narinfo signatures,
 	// but is otherwise left untouched.
 	Put(ctx context.Context, in *PathInfo, opts ...grpc.CallOption) (*PathInfo, error)
+	// Calculate the NAR representation of the contents specified by the
+	// root_node. The calculation SHOULD be cached server-side for subsequent
+	// requests.
+	//
+	// All references (to blobs or Directory messages) MUST already exist in
+	// the store.
+	//
+	// The method can be used to produce a Nix fixed-output path, which
+	// contains the (compressed) sha256 of the NAR content representation in
+	// the root_node name (suffixed with the name).
+	//
+	// It can also be used to calculate arbitrary NAR hashes of output paths,
+	// in case a legacy Nix Binary Cache frontend is provided.
+	CalculateNAR(ctx context.Context, in *Node, opts ...grpc.CallOption) (*CalculateNARResponse, error)
 }
 
 type pathInfoServiceClient struct {
@@ -66,26 +83,52 @@ func (c *pathInfoServiceClient) Put(ctx context.Context, in *PathInfo, opts ...g
 	return out, nil
 }
 
+func (c *pathInfoServiceClient) CalculateNAR(ctx context.Context, in *Node, opts ...grpc.CallOption) (*CalculateNARResponse, error) {
+	out := new(CalculateNARResponse)
+	err := c.cc.Invoke(ctx, "/tvix.store.v1.PathInfoService/CalculateNAR", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
 // PathInfoServiceServer is the server API for PathInfoService service.
 // All implementations must embed UnimplementedPathInfoServiceServer
 // for forward compatibility
 type PathInfoServiceServer interface {
-	// Get retrieves a PathInfo object, by using the lookup parameters in
-	// GetPathInfoRequest.
-	// If the PathInfo object contains a DirectoryNode, it needs to be looked
-	// up separately via the DirectoryService, which is purely
-	// content-addressed.
+	// Return a PathInfo message, identified by the decoded nixbase32 part
+	// of a Nix output path.
+	//
+	// To substitute /nix/store/xm35nga2g20mz5sm5l6n8v3bdm86yj83-
+	// cowsay-3.04 the bytes in the request would be
+	// nixbase32dec("xm35nga2g20mz5sm5l6n8v3bdm86yj83").
 	Get(context.Context, *GetPathInfoRequest) (*PathInfo, error)
 	// Put uploads a PathInfo object to the remote end. It MUST not return
 	// until the PathInfo object has been written on the the remote end.
+	//
 	// The remote end MAY check if a potential DirectoryNode has already been
 	// uploaded.
+	//
 	// Uploading clients SHOULD obviously not steer other machines to try to
 	// substitute before from the remote end before having finished uploading
 	// PathInfo, Directories and Blobs.
 	// The returned PathInfo object MAY contain additional narinfo signatures,
 	// but is otherwise left untouched.
 	Put(context.Context, *PathInfo) (*PathInfo, error)
+	// Calculate the NAR representation of the contents specified by the
+	// root_node. The calculation SHOULD be cached server-side for subsequent
+	// requests.
+	//
+	// All references (to blobs or Directory messages) MUST already exist in
+	// the store.
+	//
+	// The method can be used to produce a Nix fixed-output path, which
+	// contains the (compressed) sha256 of the NAR content representation in
+	// the root_node name (suffixed with the name).
+	//
+	// It can also be used to calculate arbitrary NAR hashes of output paths,
+	// in case a legacy Nix Binary Cache frontend is provided.
+	CalculateNAR(context.Context, *Node) (*CalculateNARResponse, error)
 	mustEmbedUnimplementedPathInfoServiceServer()
 }
 
@@ -99,6 +142,9 @@ func (UnimplementedPathInfoServiceServer) Get(context.Context, *GetPathInfoReque
 func (UnimplementedPathInfoServiceServer) Put(context.Context, *PathInfo) (*PathInfo, error) {
 	return nil, status.Errorf(codes.Unimplemented, "method Put not implemented")
 }
+func (UnimplementedPathInfoServiceServer) CalculateNAR(context.Context, *Node) (*CalculateNARResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method CalculateNAR not implemented")
+}
 func (UnimplementedPathInfoServiceServer) mustEmbedUnimplementedPathInfoServiceServer() {}
 
 // UnsafePathInfoServiceServer may be embedded to opt out of forward compatibility for this service.
@@ -148,6 +194,24 @@ func _PathInfoService_Put_Handler(srv interface{}, ctx context.Context, dec func
 	return interceptor(ctx, in, info, handler)
 }
 
+func _PathInfoService_CalculateNAR_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(Node)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(PathInfoServiceServer).CalculateNAR(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/tvix.store.v1.PathInfoService/CalculateNAR",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(PathInfoServiceServer).CalculateNAR(ctx, req.(*Node))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
 // PathInfoService_ServiceDesc is the grpc.ServiceDesc for PathInfoService service.
 // It's only intended for direct use with grpc.RegisterService,
 // and not to be introspected or modified (even as a copy)
@@ -163,6 +227,10 @@ var PathInfoService_ServiceDesc = grpc.ServiceDesc{
 			MethodName: "Put",
 			Handler:    _PathInfoService_Put_Handler,
 		},
+		{
+			MethodName: "CalculateNAR",
+			Handler:    _PathInfoService_CalculateNAR_Handler,
+		},
 	},
 	Streams:  []grpc.StreamDesc{},
 	Metadata: "tvix/store/protos/rpc_pathinfo.proto",