🚀 @cc-ts/crpc

Type-safe RPC for ComputerCraft that speaks TRPC!

What is CRPC?

CRPC is a TypeScript RPC framework specifically designed for ComputerCraft that maintains compatibility with tRPC. It enables end-to-end typesafe APIs between ComputerCraft computers and either other computers or external tRPC servers.

Think of it as tRPC's quirky cousin who lives in Minecraft! 🎮

✨ Features

• 🔐 Full end-to-end type safety
• 🤝 Compatible with tRPC servers via WebSocket
• 🖥️ Native ComputerCraft Rednet support
• 📡 Built-in subscriptions support
• 🔌 Multiple transport options

🚀 Quick Start

bun add @cc-ts/crpc
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🎯 Define Your Router

import { initCRPC } from "@cc-ts/crpc";

const t = initCRPC.create();

const appRouter = t.router({
    greeting: t.procedure.input(z.string()).query((opts) => {
        return `Hello ${opts.input}!`;
    }),

    counter: t.procedure.subscription((opts) => {
        return observable<number>((observer) => {
            let count = 0;
            const timer = setInterval(() => {
                observer.next(count++);
            }, 1000);

            return () => clearInterval(timer);
        });
    }),
});

export type AppRouter = typeof appRouter;
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🖥️ Create a Server

Rednet Server

import { createRednetCRPCServer } from "@cc-ts/crpc/adapter/rednet";

// Open modem
peripheral.find("modem", (name) => {
    rednet.open(name);
});

// Create server
createRednetCRPCServer({
    router: appRouter,
});

print("CRPC Server running!");
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📱 Create a Client

Rednet Client

import { createCRPCClient } from "@cc-ts/crpc";
import { RednetCRPCTransport } from "@cc-ts/crpc/client/transports/rednet";

// Open modem
peripheral.find("modem", (name) => {
    rednet.open(name);
});

const client = createCRPCClient<AppRouter>({
    transport: new RednetCRPCTransport({
        recipient: 1, // Computer ID to connect to
    }),
});

// Make type-safe calls!
const greeting = await client.greeting.query("CRPC");
print(greeting); // "Hello CRPC!"

// Subscribe to updates
client.counter.subscribe(undefined, {
    onData: (count) => {
        print(`Count: ${count}`);
    },
});
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WebSocket Client (connect to tRPC server)

import { createCRPCClient } from "@cc-ts/crpc";
import { WebSocketCRPCTransport } from "@cc-ts/crpc/client/transports/websocket";

const transport = new WebSocketCRPCTransport({
    url: "ws://localhost:3000",
    reconnect: true,
    keepAliveTimeout: 10_000,
    maxReconnectAttempts: "infinite",
});

const client = createCRPCClient<AppRouter>({
    transport,
});

// Same API as Rednet client!
const greeting = await client.greeting.query("CRPC");
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🔧 Advanced Usage

Error Handling

try {
    await client.greeting.query("");
} catch (err) {
    if (err instanceof CRPCClientError) {
        print("Something went wrong:", err.message);
    }
}
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Custom Context

interface Context {
    user?: {
        id: string;
        name: string;
    };
}

const t = initCRPC.context<Context>().create();

const appRouter = t.router({
    me: t.procedure.query(({ ctx }) => {
        return ctx.user;
    }),
});
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Middleware

const authMiddleware = t.middleware(({ next, ctx }) => {
    if (!ctx.user) {
        throw new CRPCError({
            code: "UNAUTHORIZED",
            message: "Must be logged in",
        });
    }
    return next();
});

const protectedProcedure = t.procedure.use(authMiddleware);
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📚 Learn More

• tRPC Documentation - Most concepts apply to CRPC too!
• ComputerCraft Documentation - Learn about the platform
• TypeScript Documentation

🤝 Contributing

Contributions are welcome! Feel free to:

1. Fork the repository
2. Create your feature branch (git checkout -b feature/amazing-feature)
3. Commit your changes (git commit -m 'Add some amazing feature')
4. Push to the branch (git push origin feature/amazing-feature)
5. Open a Pull Request

🙏 Acknowledgments

• tRPC - For the amazing foundation this project builds upon
• ComputerCraft - For making Minecraft programming fun
• The TypeScript team - For giving us amazing type-safety

Made with ❤️ for the ComputerCraft community