Create stub server in Rust using Warp to handle websockets.

.gitignore

@@ -1,3 +1,4 @@
 .cache/
 node_modules/
 dist/
+target/

Cargo.toml

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+[package]
+name = "base2020-server"
+version = "0.1.0"
+authors = ["tangent128 <tangent128@gmail.com>"]
+edition = "2018"
+
+[dependencies]
+anyhow = "1"
+futures = "0.3"
+structopt = "0.3"
+serde = "1"
+tokio = {version = "0.2", features = ["macros"]}
+warp = "0.2"

src/main.rs

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+use anyhow::Result;
+use futures::stream::{FuturesUnordered, StreamExt};
+use std::net::ToSocketAddrs;
+use structopt::StructOpt;
+use warp::{serve, ws, ws::Ws, Filter};
+
+#[derive(StructOpt)]
+/// Server for base2020 lockstep protocol for multiplayer games.
+struct Args {
+    /// The socket address to listen for connections on;
+    /// can be a hostname to bind to multiple hosts at once,
+    /// such as to listen on both IPv4 & IPv6.
+    listen: String,
+}
+
+#[tokio::main]
+async fn main() -> Result<()> {
+    let args = Args::from_args();
+
+    let socket_handler = ws().map(|upgrade: Ws| {
+        upgrade.on_upgrade(|websocket| {
+            async move {
+                drop(websocket);
+            }
+        })
+    });
+
+    let addrs = args.listen.to_socket_addrs()?;
+    let servers = FuturesUnordered::new();
+    for addr in addrs {
+        let (_, server) = serve(socket_handler).try_bind_ephemeral(addr)?;
+        servers.push(server);
+    }
+
+    servers.for_each(|_| async {}).await;
+
+    Ok(())
+}