noctbot/bot/src/rpc.ts

import express from "express";
import { createServer } from "http";
import { ModuleRpcServer } from "rpc_ts/lib/server";
import { ModuleRpcProtocolServer } from "rpc_ts/lib/protocol/server";
import { NoctBotService } from "@shared/rpc/backend";
import { logger } from "./logging";
import { client } from "./client";
import { tryDo } from "@shared/common/async_utils";

const PORT = +(process.env.RPC_PORT ?? "8181");

const app = express();

const handler: ModuleRpcServer.ServiceHandlerFor<typeof NoctBotService> = {
    async getPing({ ping }): Promise<{ text: string }> {
        return { text: `pong: ${ping}` };
    },

    async userInServer({ userId }): Promise<{ exists: boolean }> {
        const res = await tryDo(client.bot.users.fetch(userId));
        if (!res.ok) {
            return { exists: false };
        }
        for (const [_, g] of client.bot.guilds.cache.entries()) {
            const res = await tryDo(g.members.fetch(userId));
            if (res.ok) {
                return { exists: true };
            }
        }
        return { exists: false };
    }
};

app.use(ModuleRpcProtocolServer.registerRpcRoutes(NoctBotService, handler));

export function startRpcServer(): void {
    logger.info(`Starting RPC at *:${PORT}`);
    createServer(app).listen(PORT);
}