refactor(tvix/store/pathinfosvc): add from_addr

Change-Id: I24e822351a837fce2aed568a647d009099ef32ec
Reviewed-on: https://cl.tvl.fyi/c/depot/+/8747
Reviewed-by: tazjin <tazjin@tvl.su>
Autosubmit: flokli <flokli@flokli.de>
Tested-by: BuildkiteCI

tvix/store/src/pathinfoservice/from_addr.rs

@@ -0,0 +1,58 @@
+use std::sync::Arc;
+use url::Url;
+
+use crate::{blobservice::BlobService, directoryservice::DirectoryService};
+
+use super::{GRPCPathInfoService, MemoryPathInfoService, PathInfoService, SledPathInfoService};
+
+/// Constructs a new instance of a [PathInfoService] 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.
+///
+/// As the [PathInfoService] needs to talk to [BlobService] and [DirectoryService],
+/// these also need to be passed in.
+pub fn from_addr(
+    uri: &str,
+    blob_service: Arc<dyn BlobService>,
+    directory_service: Arc<dyn DirectoryService>,
+) -> Result<Arc<dyn PathInfoService>, crate::Error> {
+    let url = Url::parse(uri).map_err(|e| {
+        crate::Error::StorageError(format!("unable to parse url: {}", e.to_string()))
+    })?;
+
+    Ok(if url.scheme() == "memory" {
+        Arc::new(MemoryPathInfoService::from_url(
+            &url,
+            blob_service,
+            directory_service,
+        )?)
+    } else if url.scheme() == "sled" {
+        Arc::new(SledPathInfoService::from_url(
+            &url,
+            blob_service,
+            directory_service,
+        )?)
+    } else if url.scheme().starts_with("grpc+") {
+        Arc::new(GRPCPathInfoService::from_url(
+            &url,
+            blob_service,
+            directory_service,
+        )?)
+    } else {
+        Err(crate::Error::StorageError(format!(
+            "unknown scheme: {}",
+            url.scheme()
+        )))?
+    })
+}