Handle game chats and write them into the log

Players sometimes say things in the game chat, which I would be
interested in at least becoming aware of.

src/Game.ts

@@ -26,6 +26,7 @@ export class Game extends EventEmitter<Events> {
     state: GoEngineConfig;
     opponent_evenodd: null | number;
     greeted: boolean;
+    startup_timestamp: number;
     bot?: Bot;
     using_opening_bot: boolean = false;
     ending_bot?: Bot;
@@ -56,6 +57,7 @@ export class Game extends EventEmitter<Events> {
         this.verbose = trace.debug.bind(null, `[game ${game_id}]`);
         this.warn = trace.warn.bind(null, `[game ${game_id}]`);
         this.error = trace.error.bind(null, `[game ${game_id}]`);
+        this.startup_timestamp = Date.now();
         this.state = null;
         this.opponent_evenodd = null;
         this.greeted = false;
@@ -226,6 +228,7 @@ export class Game extends EventEmitter<Events> {
                 // Try to connect again, to get the server to send the gamedata over.
                 socket.send("game/connect", {
                     game_id: game_id,
+                    chat: true,
                 });
                 return;
             }
@@ -341,8 +344,23 @@ export class Game extends EventEmitter<Events> {
             socket.off(`game/${game_id}/move`, on_move);
         });
 
+        socket.send("chat/join", {
+            channel: `game-${game_id}`,
+        });
+        const on_chat = (d) => {
+            // If the bot is down for a while, we will miss those chats, rather
+            // than to reiterate all the chats on all the ongoing games.
+            handleChatLine(game_id, d.line, this.startup_timestamp);
+        };
+        socket.on(`game/${game_id}/chat`, on_chat);
+        this.on("disconnecting", () => {
+            socket.off(`game/${game_id}/chat`, on_chat);
+        });
+
+        trace.log("connecting");
         socket.send("game/connect", {
             game_id: game_id,
+            chat: true,
         });
 
         /*
@@ -827,6 +845,20 @@ export class Game extends EventEmitter<Events> {
     }
 }
 
+export function handleChatLine(game_id: string, line: any, cutoff_timestamp: number) {
+    if (typeof line.body !== "string") {
+        return;
+    }
+    if (line.username === config.username) {
+        return;
+    }
+    if (line.date < cutoff_timestamp) {
+        return;
+    }
+
+    trace.log(`[game ${game_id}] Game chat from ${line.username}: ${line.body}`);
+}
+
 function num2char(num: number): string {
     if (num === -1) {
         return ".";

src/main.ts

@@ -6,7 +6,7 @@ import { config, config_event_emitter, TimeControlRanges } from "./config";
 import { socket } from "./socket";
 import { trace } from "./trace";
 import { post, api1 } from "./util";
-import { Game } from "./Game";
+import { Game, handleChatLine } from "./Game";
 import { bot_pools } from "./pools";
 import { JGOFTimeControl } from "goban/src/JGOF";
 import { Speed } from "./types";
@@ -65,6 +65,7 @@ interface RejectionDetails {
 class Main {
     notification_connect_interval: ReturnType<typeof setInterval>;
     connected_games: { [game_id: string]: Game };
+    connected_finished_games: { [game_id: string]: boolean };
 
     //games_by_player: { [player_id: string]: Game[] };
     connected: boolean;
@@ -77,6 +78,7 @@ class Main {
 
     constructor() {
         this.connected_games = {};
+        this.connected_finished_games = {};
         //this.games_by_player = {}; // Keep track of connected games per player
         this.connected = false;
 
@@ -329,6 +331,47 @@ class Main {
                 }
                 break;
 
+            case "lateChatReceivedInGame":
+                {
+                    this.deleteNotification(notification);
+                    const game_id = notification.game_id;
+                    if (game_id in this.connected_finished_games) {
+                        break;
+                    }
+
+                    trace.debug(`Connecting to ${game_id} to receive late chats`);
+                    socket.send("chat/join", {
+                        channel: `game-${game_id}`,
+                    });
+                    const on_chat = (chat) => {
+                        handleChatLine(game_id, chat.line, notification.timestamp - 1);
+                    };
+                    socket.on(`game/${game_id}/chat`, on_chat);
+
+                    // Connecting to a game from outside Game deserves a little
+                    // bit of care, but I think it should be OK, because
+                    // lateChatReceivedInGame implies the game is over, so we
+                    // should not be getting in the way of anything here.
+                    //
+                    // We could connect to the game as we usually do, but this
+                    // would confuse the logic there that expects to handle an
+                    // unfinished game.
+                    this.connected_finished_games[game_id] = true;
+                    socket.send("game/connect", {
+                        game_id: game_id,
+                        chat: true,
+                    });
+                    setTimeout(() => {
+                        trace.debug(`Disconnecting from ${game_id} (chats)`);
+                        delete this.connected_finished_games[game_id];
+                        socket.send("game/disconnect", {
+                            game_id: game_id,
+                        });
+                        socket.off(`game/${game_id}/chat`, on_chat);
+                    }, 5000);
+                }
+                break;
+
             default:
                 {
                     if (!(notification.type in ignorable_notifications)) {