spawn extra compute threads

battlesnake/src/main.rs

@@ -1,11 +1,15 @@
 #![allow(clippy::needless_pass_by_value)]
 
 use enum_iterator::Sequence;
-use log::info;
-use rocket::fairing::AdHoc;
-use rocket::http::Status;
-use rocket::serde::{json::Json, Deserialize};
-use rocket::{get, launch, post, routes};
+use log::{error, info};
+use rocket::{
+    fairing::AdHoc,
+    get,
+    http::Status,
+    launch, post, routes,
+    serde::{json::Json, Deserialize},
+    tokio::task,
+};
 use serde::Serialize;
 use serde_json::Value;
 use std::env;
@@ -208,13 +212,19 @@ fn handle_start(start_req: Json<GameState>) -> Status {
 }
 
 #[post("/move", format = "json", data = "<move_req>")]
-fn handle_move(move_req: Json<GameState>) -> Option<Json<Action>> {
-    let response = logic::get_move(
+async fn handle_move(move_req: Json<GameState>) -> Option<Json<Action>> {
+    let response = task::spawn_blocking(move || {
+        logic::get_move(
             &move_req.game,
             move_req.turn,
             &move_req.board,
             &move_req.you,
-    )?;
+        )
+    })
+    .await
+    .inspect_err(|e| error!("failed to join compute thread: {e}"))
+    .ok()
+    .flatten()?;
 
     Some(Json(response))
 }