refactor(tvix): move castore into tvix-castore crate r/6629

This splits the pure content-addressed layers from tvix-store into a
`castore` crate, and only leaves PathInfo related things, as well as the
CLI entrypoint in the tvix-store crate.

Notable changes:
 - `fixtures` and `utils` had to be moved out of the `test` cfg, so they
   can be imported from tvix-store.
 - Some ad-hoc fixtures in the test were moved to proper fixtures in the
   same step.
 - The protos are now created by a (more static) recipe in the protos/
   directory.

The (now two) golang targets are commented out, as it's not possible to
update them properly in the same CL. This will be done by a followup CL
once this is merged (and whitby deployed)

Bug: https://b.tvl.fyi/issues/301

Change-Id: I8d675d4bf1fb697eb7d479747c1b1e3635718107
Reviewed-on: https://cl.tvl.fyi/c/depot/+/9370
Reviewed-by: tazjin <tazjin@tvl.su>
Reviewed-by: flokli <flokli@flokli.de>
Autosubmit: flokli <flokli@flokli.de>
Tested-by: BuildkiteCI
Reviewed-by: Connor Brewster <cbrewster@hey.com>

1 files changed, 36 insertions, 0 deletions

diff --git a/tvix/castore/src/directoryservice/from_addr.rs b/tvix/castore/src/directoryservice/from_addr.rs
new file mode 100644
index 000000000000..776cf061096c
--- /dev/null
+++ b/tvix/castore/src/directoryservice/from_addr.rs
@@ -0,0 +1,36 @@
+use std::sync::Arc;
+use url::Url;
+
+use super::{DirectoryService, GRPCDirectoryService, MemoryDirectoryService, SledDirectoryService};
+
+/// Constructs a new instance of a [DirectoryService] from an URI.
+///
+/// The following URIs are supported:
+/// - `memory:`
+///   Uses a in-memory implementation.
+/// - `sled:`
+///   Uses a in-memory sled implementation.
+/// - `sled:///absolute/path/to/somewhere`
+///   Uses sled, using a path on the disk for persistency. Can be only opened
+///   from one process at the same time.
+/// - `grpc+unix:///absolute/path/to/somewhere`
+///   Connects to a local tvix-store gRPC service via Unix socket.
+/// - `grpc+http://host:port`, `grpc+https://host:port`
+///    Connects to a (remote) tvix-store gRPC service.
+pub fn from_addr(uri: &str) -> Result<Arc<dyn DirectoryService>, crate::Error> {
+    let url = Url::parse(uri)
+        .map_err(|e| crate::Error::StorageError(format!("unable to parse url: {}", e)))?;
+
+    Ok(if url.scheme() == "memory" {
+        Arc::new(MemoryDirectoryService::from_url(&url)?)
+    } else if url.scheme() == "sled" {
+        Arc::new(SledDirectoryService::from_url(&url)?)
+    } else if url.scheme().starts_with("grpc+") {
+        Arc::new(GRPCDirectoryService::from_url(&url)?)
+    } else {
+        Err(crate::Error::StorageError(format!(
+            "unknown scheme: {}",
+            url.scheme()
+        )))?
+    })
+}