use super::PathInfoService;
use crate::{blobservice::BlobService, directoryservice::DirectoryService, proto};
use std::sync::Arc;
use tokio::net::UnixStream;
use tonic::{transport::Channel, Code, Status};
/// Connects to a (remote) tvix-store PathInfoService over gRPC.
#[derive(Clone)]
pub struct GRPCPathInfoService {
/// A handle into the active tokio runtime. Necessary to spawn tasks.
tokio_handle: tokio::runtime::Handle,
/// The internal reference to a gRPC client.
/// Cloning it is cheap, and it internally handles concurrent requests.
grpc_client: proto::path_info_service_client::PathInfoServiceClient<Channel>,
}
impl GRPCPathInfoService {
/// construct a [GRPCPathInfoService] from a [proto::path_info_service_client::PathInfoServiceClient].
/// panics if called outside the context of a tokio runtime.
pub fn from_client(
grpc_client: proto::path_info_service_client::PathInfoServiceClient<Channel>,
) -> Self {
Self {
tokio_handle: tokio::runtime::Handle::current(),
grpc_client,
}
}
}
impl PathInfoService for GRPCPathInfoService {
/// Constructs a [GRPCPathInfoService] from the passed [url::Url]:
/// - scheme has to match `grpc+*://`.
/// 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.
/// The blob_service and directory_service arguments are ignored, because the gRPC service already provides answers to these questions.
fn from_url(
url: &url::Url,
_blob_service: Arc<dyn BlobService>,
_directory_service: Arc<dyn DirectoryService>,
) -> Result<Self, crate::Error> {
// Start checking for the scheme to start with grpc+.
match url.scheme().strip_prefix("grpc+") {
None => Err(crate::Error::StorageError("invalid scheme".to_string())),
Some(rest) => {
if rest == "unix" {
if url.host_str().is_some() {
return Err(crate::Error::StorageError(
"host may not be set".to_string(),
));
}
let path = url.path().to_string();
let channel = tonic::transport::Endpoint::try_from("http://[::]:50051") // doesn't matter
.unwrap()
.connect_with_connector_lazy(tower::service_fn(
move |_: tonic::transport::Uri| UnixStream::connect(path.clone()),
));
let grpc_client =
proto::path_info_service_client::PathInfoServiceClient::new(channel);
Ok(Self::from_client(grpc_client))
} else {
// ensure path is empty, not supported with gRPC.
if !url.path().is_empty() {
return Err(crate::Error::StorageError(
"path may not be set".to_string(),
));
}
// clone the uri, and drop the grpc+ from the scheme.
// Recreate a new uri with the `grpc+` prefix dropped from the scheme.
// We can't use `url.set_scheme(rest)`, as it disallows
// setting something http(s) that previously wasn't.
let url = {
let url_str = url.to_string();
let s_stripped = url_str.strip_prefix("grpc+").unwrap();
url::Url::parse(s_stripped).unwrap()
};
let channel = tonic::transport::Endpoint::try_from(url.to_string())
.unwrap()
.connect_lazy();
let grpc_client =
proto::path_info_service_client::PathInfoServiceClient::new(channel);
Ok(Self::from_client(grpc_client))
}
}
}
}
fn get(&self, digest: [u8; 20]) -> Result<Option<proto::PathInfo>, crate::Error> {
// Get a new handle to the gRPC client.
let mut grpc_client = self.grpc_client.clone();
let task: tokio::task::JoinHandle<Result<proto::PathInfo, Status>> =
self.tokio_handle.spawn(async move {
let path_info = grpc_client
.get(proto::GetPathInfoRequest {
by_what: Some(proto::get_path_info_request::ByWhat::ByOutputHash(
digest.to_vec().into(),
)),
})
.await?
.into_inner();
Ok(path_info)
});
match self.tokio_handle.block_on(task)? {
Ok(path_info) => Ok(Some(path_info)),
Err(e) if e.code() == Code::NotFound => Ok(None),
Err(e) => Err(crate::Error::StorageError(e.to_string())),
}
}
fn put(&self, path_info: proto::PathInfo) -> Result<proto::PathInfo, crate::Error> {
// Get a new handle to the gRPC client.
let mut grpc_client = self.grpc_client.clone();
let task: tokio::task::JoinHandle<Result<proto::PathInfo, Status>> =
self.tokio_handle.spawn(async move {
let path_info = grpc_client.put(path_info).await?.into_inner();
Ok(path_info)
});
self.tokio_handle
.block_on(task)?
.map_err(|e| crate::Error::StorageError(e.to_string()))
}
fn calculate_nar(
&self,
root_node: &proto::node::Node,
) -> Result<(u64, [u8; 32]), crate::Error> {
// Get a new handle to the gRPC client.
let mut grpc_client = self.grpc_client.clone();
let root_node = root_node.clone();
let task: tokio::task::JoinHandle<Result<_, Status>> =
self.tokio_handle.spawn(async move {
let path_info = grpc_client
.calculate_nar(proto::Node {
node: Some(root_node),
})
.await?
.into_inner();
Ok(path_info)
});
let resp = self
.tokio_handle
.block_on(task)?
.map_err(|e| crate::Error::StorageError(e.to_string()))?;
let nar_sha256: [u8; 32] = resp
.nar_sha256
.to_vec()
.try_into()
.map_err(|_e| crate::Error::StorageError("invalid digest length".to_string()))?;
Ok((resp.nar_size, nar_sha256))
}
}
#[cfg(test)]
mod tests {
use std::sync::Arc;
use std::thread;
use tempfile::TempDir;
use tokio::net::UnixListener;
use tokio::task;
use tokio::time;
use tokio_stream::wrappers::UnixListenerStream;
use crate::pathinfoservice::MemoryPathInfoService;
use crate::proto::GRPCPathInfoServiceWrapper;
use crate::tests::fixtures;
use crate::tests::utils::gen_blob_service;
use crate::tests::utils::gen_directory_service;
use super::GRPCPathInfoService;
use super::PathInfoService;
/// This uses the wrong scheme
#[test]
fn test_invalid_scheme() {
let url = url::Url::parse("http://foo.example/test").expect("must parse");
assert!(
GRPCPathInfoService::from_url(&url, gen_blob_service(), gen_directory_service())
.is_err()
);
}
/// This uses the correct scheme for a unix socket.
/// The fact that /path/to/somewhere doesn't exist yet is no problem, because we connect lazily.
#[tokio::test]
async fn test_valid_unix_path() {
let url = url::Url::parse("grpc+unix:///path/to/somewhere").expect("must parse");
assert!(
GRPCPathInfoService::from_url(&url, gen_blob_service(), gen_directory_service())
.is_ok()
);
}
/// This uses the correct scheme for a unix socket,
/// but sets a host, which is unsupported.
#[tokio::test]
async fn test_invalid_unix_path_with_domain() {
let url =
url::Url::parse("grpc+unix://host.example/path/to/somewhere").expect("must parse");
assert!(
GRPCPathInfoService::from_url(&url, gen_blob_service(), gen_directory_service())
.is_err()
);
}
/// This uses the correct scheme for a HTTP server.
/// The fact that nothing is listening there is no problem, because we connect lazily.
#[tokio::test]
async fn test_valid_http() {
let url = url::Url::parse("grpc+http://localhost").expect("must parse");
assert!(
GRPCPathInfoService::from_url(&url, gen_blob_service(), gen_directory_service())
.is_ok()
);
}
/// This uses the correct scheme for a HTTPS server.
/// The fact that nothing is listening there is no problem, because we connect lazily.
#[tokio::test]
async fn test_valid_https() {
let url = url::Url::parse("grpc+https://localhost").expect("must parse");
assert!(
GRPCPathInfoService::from_url(&url, gen_blob_service(), gen_directory_service())
.is_ok()
);
}
/// This uses the correct scheme, but also specifies
/// an additional path, which is not supported for gRPC.
/// The fact that nothing is listening there is no problem, because we connect lazily.
#[tokio::test]
async fn test_invalid_http_with_path() {
let url = url::Url::parse("grpc+https://localhost/some-path").expect("must parse");
assert!(
GRPCPathInfoService::from_url(&url, gen_blob_service(), gen_directory_service())
.is_err()
);
}
/// This uses the correct scheme for a unix socket, and provides a server on the other side.
#[tokio::test]
async fn test_valid_unix_path_ping_pong() {
let tmpdir = TempDir::new().unwrap();
let path = tmpdir.path().join("daemon");
// let mut join_set = JoinSet::new();
// prepare a client
let client = {
let mut url = url::Url::parse("grpc+unix:///path/to/somewhere").expect("must parse");
url.set_path(path.to_str().unwrap());
GRPCPathInfoService::from_url(&url, gen_blob_service(), gen_directory_service())
.expect("must succeed")
};
let path_copy = path.clone();
// Spin up a server, in a thread far away, which spawns its own tokio runtime,
// and blocks on the task.
thread::spawn(move || {
// Create the runtime
let rt = tokio::runtime::Runtime::new().unwrap();
// Get a handle from this runtime
let handle = rt.handle();
let task = handle.spawn(async {
let uds = UnixListener::bind(path_copy).unwrap();
let uds_stream = UnixListenerStream::new(uds);
// spin up a new server
let mut server = tonic::transport::Server::builder();
let router = server.add_service(
crate::proto::path_info_service_server::PathInfoServiceServer::new(
GRPCPathInfoServiceWrapper::from(Arc::new(MemoryPathInfoService::new(
gen_blob_service(),
gen_directory_service(),
))
as Arc<dyn PathInfoService>),
),
);
router.serve_with_incoming(uds_stream).await
});
handle.block_on(task)
});
// wait for the socket to be created
{
let mut socket_created = false;
for _try in 1..20 {
if path.exists() {
socket_created = true;
break;
}
tokio::time::sleep(time::Duration::from_millis(20)).await;
}
assert!(
socket_created,
"expected socket path to eventually get created, but never happened"
);
}
let pi = task::spawn_blocking(move || {
client
.get(fixtures::DUMMY_OUTPUT_HASH.to_vec().try_into().unwrap())
.expect("must not be error")
})
.await
.expect("must not be err");
assert!(pi.is_none());
}
}
