Revert to tokio.

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Cargo.toml

 serde_json = "1.0"
 dirs = "2.0"
 byteorder = "1.3"
-async-std = "1.0"
-async-tungstenite = { version = "0.3", features = ["async-std-runtime"] }
-futures = "0.3"
+tokio = { version = "0.2", features = ["fs", "io-util", "macros", "net", "stream", "tcp"] }
+futures = "0.3.1"
+futures-tokio-compat = { git = "https://github.com/mgottschlag/futures-tokio-compat.git" }
+async-tungstenite = { version = "0.3", features = ["tokio-runtime"] }
 env_logger = "0.7"
 log = "0.4"
+inotify-sys = "0.1"

src/bin/client.rs

 use std::io;
 use std::sync::{Arc, Mutex};
 
-use async_std::os::unix::net::{UnixListener, UnixStream};
-use async_std::prelude::*;
-use async_std::task;
+use tokio::net::{UnixListener, UnixStream};
+use tokio::stream::StreamExt;
+use tokio::io::{AsyncWriteExt, AsyncReadExt};
 
 use twfss::{Database, SynchronizedDirectory};
 
     format!("{}/client.db", data_dir())
 }
 
-fn main() {
-    task::block_on(run());
-}
-
-async fn run() {
+#[tokio::main]
+async fn main() {
     // Create the data directories if necessary.
     create_dir_all(config_dir()).unwrap();
     create_dir_all(data_dir()).unwrap();
 
     // Listen for CLI commands.
     // TODO: Graceful shutdown on errors.
-    let listener = UnixListener::bind(cli::socket_path()).await.unwrap();
+    let mut listener = UnixListener::bind(cli::socket_path()).unwrap();
     let mut incoming = listener.incoming();
     while let Some(stream) = incoming.next().await {
         match stream {
                     Err(e) => {
                         // Log error and try to send it to the stream.
                         // TODO
-                        write!(stream, "Error: {:?}", e).await.ok();
+                        stream.write_all(format!("Error: {:?}", e).as_bytes()).await.ok();
                     }
                 };
             }

src/bin/server.rs

-use async_std::net::{SocketAddr, TcpListener, TcpStream};
-use async_std::task;
+use std::net::SocketAddr;
+
 use async_tungstenite::accept_async;
-use futures::{SinkExt, StreamExt};
 use log::*;
+use tokio::net::{TcpListener, TcpStream};
+use tokio::stream::StreamExt;
+use futures_tokio_compat::Compat;
+use futures::sink::SinkExt;
 
 fn config_dir() -> String {
     format!(
     format!("{}/server.db", data_dir())
 }
 
-fn main() {
-    task::block_on(run());
-}
-
-async fn run() {
+#[tokio::main]
+async fn main() {
     env_logger::init();
 
     // Read configuration.
 
     // Start the websocket server and listen for connections.
     let addr = "127.0.0.1:1199";
-    let listener = TcpListener::bind(&addr).await.unwrap();
+    let mut listener = TcpListener::bind(&addr)
+        .await
+        .expect("cannot bind to server port");
+    let mut incoming = listener.incoming();
     info!("Listening on {}.", addr);
 
-    while let Ok((stream, _)) = listener.accept().await {
+    while let Some(Ok(stream)) = incoming.next().await {
         let peer = stream
             .peer_addr()
             .expect("connected streams should have a peer address");
 
-        async_std::task::spawn(accept_connection(peer, stream));
+        tokio::spawn(accept_connection(peer, stream));
     }
 }
 
+// TODO: Robust error handling.
+
 async fn accept_connection(peer: SocketAddr, stream: TcpStream) {
-    let mut ws_stream = accept_async(stream).await.expect("Failed to accept");
+    let mut ws_stream = accept_async(Compat::new(stream)).await.expect("Failed to accept");
 
     info!("New WebSocket connection from {}.", peer);