feat(tvix/store): Support listening on UNIX domain sockets r/6653

This adds support for listening on UNIX domain sockets via the
tokio-listener crate. The crate will automatically determine whether to
start a TCP or UNIX domain socket server based on the listen address.

Unfortunately, it's not compatible with tonic right out of the box so I
added some wrapper types to implement the necessary traits to make
things work. We should investigate upstreaming a `tonic` option to the
tokio-listener crate which implements the relevant `tonic` traits.

Example:
```
$ tvix-store daemon -l /run/tvix-store.sock
INFO tvix_store: tvix-store listening on /run/tvix-store.sock

$ tvix-store mount -l /mnt/tvix --blob-service-addr grpc+unix:///run/tvix-store.sock --directory-service-addr grpc+unix:///run/tvix-store.sock --path-info-service-addr grpc+unix:///run/tvix-store.sock

$ ls /mnt/tvix
```

Change-Id: I91c4a4b0c5a177b3b90e6c01a4e5d263130e6bdb
Reviewed-on: https://cl.tvl.fyi/c/depot/+/9429
Tested-by: BuildkiteCI
Reviewed-by: flokli <flokli@flokli.de>
Reviewed-by: raitobezarius <tvl@lahfa.xyz>

1 files changed, 4 insertions, 1 deletions

diff --git a/tvix/store/src/bin/tvix-store.rs b/tvix/store/src/bin/tvix-store.rs
index 813d62cb129a..e80014047ca4 100644
--- a/tvix/store/src/bin/tvix-store.rs
+++ b/tvix/store/src/bin/tvix-store.rs
@@ -17,6 +17,7 @@ use tvix_castore::proto::node::Node;
 use tvix_castore::proto::GRPCBlobServiceWrapper;
 use tvix_castore::proto::GRPCDirectoryServiceWrapper;
 use tvix_castore::proto::NamedNode;
+use tvix_store::listener::ListenerStream;
 use tvix_store::pathinfoservice;
 use tvix_store::proto::path_info_service_server::PathInfoServiceServer;
 use tvix_store::proto::GRPCPathInfoServiceWrapper;
@@ -220,7 +221,9 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
 
             info!("tvix-store listening on {}", listen_address);
 
-            router.serve(listen_address).await?;
+            let listener = ListenerStream::bind(&listen_address).await?;
+
+            router.serve_with_incoming(listener).await?;
         }
         Commands::Import {
             paths,