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//! Experimental RPC support.
use anyhow::Result;
use arti_rpcserver::{RpcMgr, RpcSession};
use futures::task::SpawnExt;
use std::{path::Path, sync::Arc};
use arti_client::TorClient;
use tor_rtcompat::Runtime;
cfg_if::cfg_if! {
if #[cfg(all(feature="tokio", not(target_os="windows")))] {
use tokio_crate::net::UnixListener ;
use tokio_util::compat::{TokioAsyncReadCompatExt, TokioAsyncWriteCompatExt};
} else if #[cfg(all(feature="async-std", not(target_os="windows")))] {
use async_std::os::unix::net::UnixListener;
} else if #[cfg(target_os="windows")] {
compile_error!("Sorry, no windows support for RPC yet.");
// TODO RPC: Tokio has a named pipe API; AsyncStd should let us construct
// one via FromRawHandle.
} else {
compile_error!("You need to have tokio or async-std.");
}
}
/// Run an RPC listener task to accept incoming connections at the Unix
/// socket address of `path`.
pub(crate) fn launch_rpc_listener<R: Runtime>(
runtime: &R,
path: impl AsRef<Path>,
client: TorClient<R>,
) -> Result<Arc<RpcMgr>> {
// TODO RPC: there should be an error return instead.
// TODO RPC: Maybe the UnixListener functionality belongs in tor-rtcompat?
// But I certainly don't want to make breaking changes there if we can help
// it.
let listener = UnixListener::bind(path)?;
let rpc_mgr =
RpcMgr::new(move |_auth| RpcSession::new_with_client(Arc::new(client.isolated_client())));
let rt_clone = runtime.clone();
let rpc_mgr_clone = rpc_mgr.clone();
// TODO: Using spawn in this way makes it hard to report whether we
// succeeded or not. This is something we should fix when we refactor
// our service-launching code.
runtime.spawn(async {
let result = run_rpc_listener(rt_clone, listener, rpc_mgr_clone).await;
if let Err(e) = result {
tracing::warn!("RPC manager quit with an error: {}", e);
}
})?;
Ok(rpc_mgr)
}
/// Backend function to implement an RPC listener: runs in a loop.
async fn run_rpc_listener<R: Runtime>(
runtime: R,
listener: UnixListener,
rpc_mgr: Arc<RpcMgr>,
) -> Result<()> {
loop {
let (stream, _addr) = listener.accept().await?;
// TODO RPC: Perhaps we should have rpcmgr hold the client reference?
let connection = rpc_mgr.new_connection();
let (input, output) = stream.into_split();
#[cfg(feature = "tokio")]
let (input, output) = (input.compat(), output.compat_write());
runtime.spawn(async {
let result = connection.run(input, output).await;
if let Err(e) = result {
tracing::warn!("RPC session ended with an error: {}", e);
}
})?;
}
}
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