From 90ecb13a1772dfdab20a006b421102c0aa584f60 Mon Sep 17 00:00:00 2001
From: Ilion Beyst <ilion.beyst@gmail.com>
Date: Sun, 5 Jun 2022 21:22:38 +0200
Subject: baby steps towards a working bot api

---
 planetwars-server/src/modules/bot_api.rs | 150 ++++++++++++++++++++++++++++---
 1 file changed, 140 insertions(+), 10 deletions(-)

(limited to 'planetwars-server/src/modules')

diff --git a/planetwars-server/src/modules/bot_api.rs b/planetwars-server/src/modules/bot_api.rs
index 1941136..0f1ff82 100644
--- a/planetwars-server/src/modules/bot_api.rs
+++ b/planetwars-server/src/modules/bot_api.rs
@@ -3,27 +3,157 @@ pub mod pb {
 }
 
 use std::net::SocketAddr;
+use std::ops::DerefMut;
+use std::path::PathBuf;
+use std::sync::{Arc, Mutex};
 
+use runner::match_context::{EventBus, PlayerHandle, RequestMessage};
+use runner::match_log::MatchLogger;
+use tokio::sync::{mpsc, oneshot};
+use tokio_stream::wrappers::UnboundedReceiverStream;
 use tonic;
 use tonic::transport::Server;
-use tonic::{Request, Response, Status};
+use tonic::{Request, Response, Status, Streaming};
 
-pub struct BotApiServer {}
+use planetwars_matchrunner as runner;
+
+use crate::db;
+use crate::{ConnectionPool, MAPS_DIR, MATCHES_DIR};
+
+use super::matches::code_bundle_to_botspec;
+
+pub struct BotApiServer {
+    sync_thing: ServerSyncThing,
+}
+
+#[tonic::async_trait]
+impl pb::bot_api_service_server::BotApiService for BotApiServer {
+    type ConnectBotStream = UnboundedReceiverStream<Result<pb::PlayerRequest, Status>>;
+
+    async fn connect_bot(
+        &self,
+        req: Request<Streaming<pb::PlayerRequestResponse>>,
+    ) -> Result<Response<Self::ConnectBotStream>, Status> {
+        println!("bot connected");
+        let stream = req.into_inner();
+        let sync_data = self.sync_thing.streams.lock().unwrap().take().unwrap();
+        sync_data.tx.send(stream).unwrap();
+        Ok(Response::new(UnboundedReceiverStream::new(
+            sync_data.server_messages,
+        )))
+    }
+}
+
+#[derive(Clone)]
+struct ServerSyncThing {
+    streams: Arc<Mutex<Option<SyncThingData>>>,
+}
+
+struct SyncThingData {
+    tx: oneshot::Sender<Streaming<pb::PlayerRequestResponse>>,
+    server_messages: mpsc::UnboundedReceiver<Result<pb::PlayerRequest, Status>>,
+}
+
+impl ServerSyncThing {
+    fn new() -> Self {
+        ServerSyncThing {
+            streams: Arc::new(Mutex::new(None)),
+        }
+    }
+}
+
+struct RemoteBotSpec {
+    sync_thing: ServerSyncThing,
+}
 
 #[tonic::async_trait]
-impl pb::test_service_server::TestService for BotApiServer {
-    async fn greet(&self, req: Request<pb::Hello>) -> Result<Response<pb::HelloResponse>, Status> {
-        Ok(Response::new(pb::HelloResponse {
-            response: format!("hallo {}", req.get_ref().hello_message),
-        }))
+impl runner::BotSpec for RemoteBotSpec {
+    async fn run_bot(
+        &self,
+        player_id: u32,
+        event_bus: Arc<Mutex<EventBus>>,
+        _match_logger: MatchLogger,
+    ) -> Box<dyn PlayerHandle> {
+        let (tx, rx) = oneshot::channel();
+        let (server_msg_snd, server_msg_recv) = mpsc::unbounded_channel();
+        *self.sync_thing.streams.lock().unwrap().deref_mut() = Some(SyncThingData {
+            tx,
+            server_messages: server_msg_recv,
+        });
+
+        let client_messages = rx.await.unwrap();
+        tokio::spawn(handle_bot_messages(player_id, event_bus, client_messages));
+
+        Box::new(RemoteBotHandle {
+            sender: server_msg_snd,
+        })
+    }
+}
+
+async fn handle_bot_messages(
+    player_id: u32,
+    event_bus: Arc<Mutex<EventBus>>,
+    mut messages: Streaming<pb::PlayerRequestResponse>,
+) {
+    while let Some(message) = messages.message().await.unwrap() {
+        let request_id = (player_id, message.request_id as u32);
+        event_bus
+            .lock()
+            .unwrap()
+            .resolve_request(request_id, Ok(message.content));
+    }
+}
+
+struct RemoteBotHandle {
+    sender: mpsc::UnboundedSender<Result<pb::PlayerRequest, Status>>,
+}
+
+impl PlayerHandle for RemoteBotHandle {
+    fn send_request(&mut self, r: RequestMessage) {
+        self.sender
+            .send(Ok(pb::PlayerRequest {
+                request_id: r.request_id as i32,
+                content: r.content,
+            }))
+            .unwrap();
     }
 }
 
-pub async fn run_bot_api() {
-    let server = BotApiServer {};
+async fn run_match(sync_thing: ServerSyncThing, pool: ConnectionPool) {
+    let conn = pool.get().await.unwrap();
+
+    let opponent = db::bots::find_bot_by_name("simplebot", &conn).unwrap();
+    let opponent_code_bundle = db::bots::active_code_bundle(opponent.id, &conn).unwrap();
+
+    let log_file_name = "remote_match.log";
+
+    let remote_bot_spec = RemoteBotSpec { sync_thing };
+
+    let match_config = runner::MatchConfig {
+        map_path: PathBuf::from(MAPS_DIR).join("hex.json"),
+        map_name: "hex".to_string(),
+        log_path: PathBuf::from(MATCHES_DIR).join(&log_file_name),
+        players: vec![
+            runner::MatchPlayer {
+                bot_spec: Box::new(remote_bot_spec),
+            },
+            runner::MatchPlayer {
+                bot_spec: code_bundle_to_botspec(&opponent_code_bundle),
+            },
+        ],
+    };
+
+    runner::run_match(match_config).await;
+}
+
+pub async fn run_bot_api(pool: ConnectionPool) {
+    let sync_thing = ServerSyncThing::new();
+    tokio::spawn(run_match(sync_thing.clone(), pool));
+    let server = BotApiServer { sync_thing };
+
     let addr = SocketAddr::from(([127, 0, 0, 1], 50051));
     Server::builder()
-        .add_service(pb::test_service_server::TestServiceServer::new(server))
+        .add_service(pb::bot_api_service_server::BotApiServiceServer::new(server))
         .serve(addr)
         .await
         .unwrap()
-- 
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