workerio

Deno module to translate Worker’s system of messages into Reader and Writer.

This module supports Deno v1.13.0 or later. The Zero-copy ArrayBuffer transfers between workers is supported from Deno 1.14.0.

Note that this package requires Worker.postMessage supports structured clone algorithm.

Note that this package accesses Deno namespace thus Using Deno in worker must be enabled.

Example

Server

import {
  WorkerReader,
  WorkerWriter,
} from "https://deno.land/x/workerio/mod.ts";

const decoder = new TextDecoder();
const encoder = new TextEncoder();

const worker = new Worker(new URL("./worker.ts", import.meta.url).href, {
  type: "module",
  // NOTE:
  // WorkerReader/WorkerWriter need to access 'Deno' namespace.
  deno: {
    namespace: true,
  },
});

const reader = new WorkerReader(worker);
const writer = new WorkerWriter(worker);

await writer.write(encoder.encode("Hello"));
await writer.write(encoder.encode("World"));

for await (const data of Deno.iter(reader)) {
  const text = decoder.decode(data);
  console.log(text);
}

Worker

import {
  WorkerReader,
  WorkerWriter,
} from "https://deno.land/x/workerio/mod.ts";

const decoder = new TextDecoder();
const encoder = new TextEncoder();

async function main(): Promise<void> {
  // deno-lint-ignore no-explicit-any
  const worker = self as any;
  const reader = new WorkerReader(worker);
  const writer = new WorkerWriter(worker);

  for await (const data of Deno.iter(reader)) {
    const text = decoder.decode(data);
    await writer.write(encoder.encode(`!!! ${text} !!!`));
  }
}

main().catch((e) => console.error(e));

Benchmark

You can run benchmark of WorkerReader and WorkerWriter with the following command:

$ deno run --no-check --unstable --allow-read --allow-net ./benchmark/benchmark.ts
===========================================================
Transfer: 1 MiB
N:        5 times
===========================================================
Relaxing 1 sec ...
Start benchmark
1 Reader: 9 [ms] Writer: 0 [ms]
2 Reader: 7 [ms] Writer: 0 [ms]
3 Reader: 6 [ms] Writer: 1 [ms]
4 Reader: 5 [ms] Writer: 1 [ms]
5 Reader: 6 [ms] Writer: 0 [ms]
===========================================================
Reader: Avg. 6.6000 msec (1271.0 Mbps)
Writer: Avg. 0.40000 msec (20972 Mbps)
===========================================================

Use -n to change the number of tries and -size to the size of the buffer (in MB) like:

$ deno run --no-check --unstable --allow-read --allow-net ./benchmark/benchmark.ts -n 3 --size 8
===========================================================
Transfer: 8 MiB
N:        3 times
===========================================================
Relaxing 1 sec ...
Start benchmark
1 Reader: 53 [ms] Writer: 7 [ms]
2 Reader: 43 [ms] Writer: 1 [ms]
3 Reader: 40 [ms] Writer: 1 [ms]
===========================================================
Reader: Avg. 45.333 msec (1480.3 Mbps)
Writer: Avg. 3.0000 msec (22370 Mbps)
===========================================================

See Benchmark for various benchmarks.

License

The code follows MIT license written in LICENSE. Contributors need to agree that any modifications sent in this repository follow the license.