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use url::Url;
use crate::{proto::blob_service_client::BlobServiceClient, Error};
use super::{
BlobService, GRPCBlobService, MemoryBlobService, ObjectStoreBlobService,
SimpleFilesystemBlobService, SledBlobService,
};
/// Constructs a new instance of a [BlobService] from an URI.
///
/// The following schemes are supported by the following services:
/// - `memory://` ([MemoryBlobService])
/// - `sled://` ([SledBlobService])
/// - `grpc+*://` ([GRPCBlobService])
/// - `simplefs://` ([SimpleFilesystemBlobService])
///
/// See their `from_url` methods for more details about their syntax.
pub async fn from_addr(uri: &str) -> Result<Box<dyn BlobService>, crate::Error> {
let url = Url::parse(uri)
.map_err(|e| crate::Error::StorageError(format!("unable to parse url: {}", e)))?;
let blob_service: Box<dyn BlobService> = match url.scheme() {
"memory" => {
// memory doesn't support host or path in the URL.
if url.has_host() || !url.path().is_empty() {
return Err(Error::StorageError("invalid url".to_string()));
}
Box::<MemoryBlobService>::default()
}
"sled" => {
// sled doesn't support host, and a path can be provided (otherwise
// it'll live in memory only).
if url.has_host() {
return Err(Error::StorageError("no host allowed".to_string()));
}
if url.path() == "/" {
return Err(Error::StorageError(
"cowardly refusing to open / with sled".to_string(),
));
}
// TODO: expose other parameters as URL parameters?
Box::new(if url.path().is_empty() {
SledBlobService::new_temporary().map_err(|e| Error::StorageError(e.to_string()))?
} else {
SledBlobService::new(url.path()).map_err(|e| Error::StorageError(e.to_string()))?
})
}
scheme if scheme.starts_with("grpc+") => {
// schemes starting with grpc+ go to the GRPCPathInfoService.
// That's normally grpc+unix for unix sockets, and grpc+http(s) for the HTTP counterparts.
// - In the case of unix sockets, there must be a path, but may not be a host.
// - In the case of non-unix sockets, there must be a host, but no path.
// Constructing the channel is handled by tvix_castore::channel::from_url.
let client = BlobServiceClient::new(crate::tonic::channel_from_url(&url).await?);
Box::new(GRPCBlobService::from_client(client))
}
"simplefs" => {
if url.path().is_empty() {
return Err(Error::StorageError("Invalid filesystem path".to_string()));
}
Box::new(SimpleFilesystemBlobService::new(url.path().into()).await?)
}
scheme if scheme.starts_with("objectstore+") => {
// We need to convert the URL to string, strip the prefix there, and then
// parse it back as url, as Url::set_scheme() rejects some of the transitions we want to do.
let trimmed_url = {
let s = url.to_string();
Url::parse(s.strip_prefix("objectstore+").unwrap()).unwrap()
};
Box::new(
ObjectStoreBlobService::parse_url(&trimmed_url)
.map_err(|e| Error::StorageError(e.to_string()))?,
)
}
scheme => {
return Err(crate::Error::StorageError(format!(
"unknown scheme: {}",
scheme
)))
}
};
Ok(blob_service)
}
#[cfg(test)]
mod tests {
use super::from_addr;
use lazy_static::lazy_static;
use tempfile::TempDir;
use test_case::test_case;
lazy_static! {
static ref TMPDIR_SLED_1: TempDir = TempDir::new().unwrap();
static ref TMPDIR_SLED_2: TempDir = TempDir::new().unwrap();
}
/// This uses an unsupported scheme.
#[test_case("http://foo.example/test", false; "unsupported scheme")]
/// This configures sled in temporary mode.
#[test_case("sled://", true; "sled valid temporary")]
/// This configures sled with /, which should fail.
#[test_case("sled:///", false; "sled invalid root")]
/// This configures sled with a host, not path, which should fail.
#[test_case("sled://foo.example", false; "sled invalid host")]
/// This configures sled with a valid path path, which should succeed.
#[test_case(&format!("sled://{}", &TMPDIR_SLED_1.path().to_str().unwrap()), true; "sled valid path")]
/// This configures sled with a host, and a valid path path, which should fail.
#[test_case(&format!("sled://foo.example{}", &TMPDIR_SLED_2.path().to_str().unwrap()), false; "sled invalid host with valid path")]
/// This correctly sets the scheme, and doesn't set a path.
#[test_case("memory://", true; "memory valid")]
/// This sets a memory url host to `foo`
#[test_case("memory://foo", false; "memory invalid host")]
/// This sets a memory url path to "/", which is invalid.
#[test_case("memory:///", false; "memory invalid root path")]
/// This sets a memory url path to "/foo", which is invalid.
#[test_case("memory:///foo", false; "memory invalid root path foo")]
/// Correct scheme to connect to a unix socket.
#[test_case("grpc+unix:///path/to/somewhere", true; "grpc valid unix socket")]
/// Correct scheme for unix socket, but setting a host too, which is invalid.
#[test_case("grpc+unix://host.example/path/to/somewhere", false; "grpc invalid unix socket and host")]
/// Correct scheme to connect to localhost, with port 12345
#[test_case("grpc+http://[::1]:12345", true; "grpc valid IPv6 localhost port 12345")]
/// Correct scheme to connect to localhost over http, without specifying a port.
#[test_case("grpc+http://localhost", true; "grpc valid http host without port")]
/// Correct scheme to connect to localhost over http, without specifying a port.
#[test_case("grpc+https://localhost", true; "grpc valid https host without port")]
/// Correct scheme to connect to localhost over http, but with additional path, which is invalid.
#[test_case("grpc+http://localhost/some-path", false; "grpc valid invalid host and path")]
/// An example for object store (Memory)
#[test_case("objectstore+memory:///", true; "objectstore valid memory url")]
/// An example for object store (File)
#[test_case("objectstore+file:///foo/bar", true; "objectstore valid file url")] // ??
/// An example for object store (S3)
#[test_case("objectstore+s3://bucket/path", true; "objectstore valid s3 url")]
/// An example for object store (GCS)
#[test_case("objectstore+gs://bucket/path", true; "objectstore valid gcs url")]
#[tokio::test]
async fn test_from_addr_tokio(uri_str: &str, exp_succeed: bool) {
if exp_succeed {
from_addr(uri_str).await.expect("should succeed");
} else {
assert!(from_addr(uri_str).await.is_err(), "should fail");
}
}
}
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