chibi_rpc

Type first minimal RPC library for Deno.

Usage

The instruction here is assuming it to be used with Fresh.
Change the POST endpoint part if you use this with other framework.

Add import mapping

deno.json

"imports":{
  "chibi_rpc": "https://deno.land/x/chibi_rpc@0.1.0/mod.ts",
}

First, set import map entry. This is not required but recommended.

Rpc call signature definition

rpc_types.ts

export type RpcSignatures = {
  greet: ({ message: string }) => Promise<{ resMessage: string }>;
}

Define a type for rpc functions set.
Each function for rpc call takes one object argument and returns a promise object.

Server rpc router

rpc_router.ts

import { ServerRpcRouter } from "chibi_rpc/types.ts";

export const appRpcRouter: ServerRpcRouter<
  AppRpcSignatures
> = {
  async greet({ message }) {
    console.log("greet", message);
    return { resMessage: message + " world " };
  },
}

Provide a server handler satisfying the rpc signature.

Post handler

routes/api/rpc/[op].ts

import { handleServerRpc } from "chibi_rpc/server.ts";

export const handler = {
  POST: (async (req, ctx) => {
    const op = ctx.params.op;
    const buf = await req.arrayBuffer();
    const text = new TextDecoder().decode(buf);
    const payload = await JSON.parse(text);
    const result = await handleServerRpc(
      appRpcRouter,
      op,
      payload,
      {},
      false
    );
    return Response.json(result);
  }
);

Create post endpoint.

Client instance

import { createRpcClient } from "chibi_rpc/client.ts";

export const rpcClient = createRpcClient<AppRpcSignatures>("/api/rpc");

Create client instance.
This rpc client instance is referenced from anywhere within frontend code.

Invoke it

const res = await rpcClient.greet({ message: "hello" });
console.log(res);   //hello world

That’s all. Have a nice development!

License

MIT