tvl-depot/tvix/store
Florian Klink e41b5ae3f0 refactor(tvix/store): infer more types
We don't need to explicitly describe the type of the task itself,
describing the return type of the async closure is sufficient.

Also, use io::Result<_> instead of Result<_, io::Error>.

Change-Id: I9ab3f990eb49929b0aea335b2bb07da392ab631f
Reviewed-on: https://cl.tvl.fyi/c/depot/+/9267
Tested-by: BuildkiteCI
Reviewed-by: tazjin <tazjin@tvl.su>
Autosubmit: flokli <flokli@flokli.de>
2023-09-05 20:41:41 +00:00
..
docs docs(tvix/store): various improvements 2023-07-07 09:48:32 +00:00
protos docs(tvix/store): update rpc_pathinfo.proto comments 2023-09-03 10:01:40 +00:00
src refactor(tvix/store): infer more types 2023-09-05 20:41:41 +00:00
build.rs feat(tvix/store/proto): use Bytes instead of Vec<u8> 2023-07-22 09:03:02 +00:00
Cargo.toml chore(tvix/store): drop walkdir workaround for symlinks at root 2023-09-05 15:19:43 +00:00
default.nix chore(tvix/store): drop separate bin package 2023-03-14 22:23:10 +00:00
README.md docs(tvix/store): drop nar-bridge references 2023-06-09 15:33:14 +00:00

//tvix/store

This contains the code hosting the tvix-store.

For the local store, Nix realizes files on the filesystem in /nix/store (and maintains some metadata in a SQLite database). For "remote stores", it communicates this metadata in NAR (Nix ARchive) and NARInfo format.

Compared to the Nix model, tvix-store stores data on a much more granular level than that, which provides more deduplication possibilities, and more granular copying.

However, enough information is preserved to still be able to render NAR and NARInfo when needed.

More Information

Check the protos/ subfolder for the definition of the exact RPC methods and messages.

Interacting with the GRPC service manually

The shell environment in //tvix provides evans, which is an interactive REPL-based gPRC client.

You can use it to connect to a tvix-store and call the various RPC methods.

$ cargo run -- daemon &
$ evans --host localhost --port 8000 -r repl
  ______
 |  ____|
 | |__    __   __   __ _   _ __    ___
 |  __|   \ \ / /  / _. | | '_ \  / __|
 | |____   \ V /  | (_| | | | | | \__ \
 |______|   \_/    \__,_| |_| |_| |___/

 more expressive universal gRPC client


tvix.store.v1@localhost:8000> service BlobService

tvix.store.v1.BlobService@localhost:8000> call Put --bytes-from-file
data (TYPE_BYTES) => /run/current-system/system
{
  "digest": "KOM3/IHEx7YfInAnlJpAElYezq0Sxn9fRz7xuClwNfA="
}

tvix.store.v1.BlobService@localhost:8000> call Get --bytes-as-base64
digest (TYPE_BYTES) => KOM3/IHEx7YfInAnlJpAElYezq0Sxn9fRz7xuClwNfA=
{
  "data": "eDg2XzY0LWxpbnV4"
}

$ echo eDg2XzY0LWxpbnV4 | base64 -d
x86_64-linux

Thanks to tvix-store providing gRPC Server Reflection (with reflection feature), you don't need to point evans to the .proto files.