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Resonate TypeScript SDK

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An SDK for writing simple and elegant distributed async await applications.

Why Resonate?

Resonate offers a programming model that allows you to build distributed applications using an intuitive paradigm you already know — async await.

What is Distributed Async Await?

Distributed Async Await extends the async await programming model beyond the boundaries of a single process and makes distributed computing a first-class citizen.

Features

Available now:

• retries
• recovery
• schedules
• tracing
• logging
• local promise store
• remote promise store

Coming soon:

• rate limiting
• metrics

Let us know features you would like Resonate to support.

Install

npm install -g ts-node
npm install @resonatehq/sdk
npm install express @types/express

What's New

Schedules! You can now invoke a function on a recurring schedule. Please note, this feature is experimental and bugs are expected. If encountered please let us know.

import { Resonate, Context } from "@resonatehq/sdk";

const resonate = new Resonate();

resonate.schedule("everyMinute", "* * * * *", (ctx: Context) => {
  console.log("every minute", Date.now());
});

resonate.schedule("everyHour", "0 * * * *", (ctx: Context) => {
  console.log("every hour", Date.now());
});

resonate.start();

Getting Started

import { Resonate, Context } from "@resonatehq/sdk";
import express, { Request, Response } from "express";

type User = {
  id: number;
};

type Song = {
  id: number;
  price: number;
};

type Status = {
  charged: boolean;
  granted: boolean;
};

async function purchase(ctx: Context, user: User, song: Song): Promise<Status> {
  const charged = await ctx.run(charge, user, song);
  const granted = await ctx.run(access, user, song);

  return { charged, granted };
}

async function charge(ctx: Context, user: User, song: Song): Promise<boolean> {
  console.log(`Charged user:${user.id} $${song.price}.`);
  return true;
}

async function access(ctx: Context, user: User, song: Song): Promise<boolean> {
  console.log(`Granted user:${user.id} access to song:${song.id}.`);
  return true;
}

// Initialize Resonate app
const resonate = new Resonate();
resonate.register("purchase", purchase);

// Initialize Express app
const app = express();
app.use(express.json())

app.post("/purchase", async (req: Request, res: Response) => {
  const user = { id: req.body?.user ?? 1 };
  const song = { id: req.body?.song ?? 1, price: 1.99 };

  // id uniquely identifies the purchase
  const id = `purchase-${user.id}-${song.id}`;

  try {
    res.send(await resonate.run("purchase", id, user, song));
  } catch (err) {
    res.status(500).send("Could not purchase song");
  }
});

app.listen(3000, () => {
  console.log("Listening on port 3000");
});

Start the server.

ts-node app.ts

And call the endpoint providing a user and song id.

curl \
  -X POST \
  -H 'Content-Type: application/json' \
  -d '{"user": 1, "song": 1}' \
  http://localhost:3000/purchase

See our docs for more detailed information.

Development

npm install
npm run lint
npm test

Contributing

See our contribution guidelines.

License

The Resonate TypeScript SDK is available under the Apache 2.0 License.