Running WebAssembly on Google Apps Script

Question

I am attempting to run WebAssembly on the new V8 Google Apps Script runtime, and it appears to be supported, however it seems that async functions are terminated after they return a Promise.

let wasm= new Uint8Array([/* snip */]).buffer
function add(a,b) {
  return((async()=>{
  console.log("running function...")
  results=await WebAssembly.instantiate(wasm)
  return results.instance.exports.add(a,b)
})());
}
function test(){
  add(2,3).then(console.log).catch(console.error)
}

when I run test "running function..." is logged, then nothing. No errors, no results. I have confirmed that WebAssembly.instantiate returns a Promise. Does anyone know what is going on, or is this something to ask Google about?

Update:

Created a issue at https://issuetracker.google.com/issues/153828715

Make sure your snip is a valid module. If so, Create a issue in issuetracker. See tag info page for more details. — TheMaster
– TheMaster, Commented Apr 13, 2020 at 16:17

TheAddonDepot · Accepted Answer · 2022-05-10 18:06:02Z

5

Refactored the sample script you provided on issue tracker and got it to work from the GAS editor (maybe Google changed something since you've posted this issue). GAS is synchronous but you can still use async/await as follows:


async function testWasm() {
    let bytes = new Uint8Array([0,97,115,109,1,0,0,0,1,7,1,96,2,127,127,1,127,3,2,1,0,7,7,1,3,97,100,100,0,0,10,9,1,7,0,32,0,32,1,106,11,0,28,4,110,97,109,101,1,6,1,0,3,97,100,100,2,13,1,0,2,0,3,108,104,115,1,3,114,104,115]);
    
    let { 
        instance: { 
            exports: { 
                add 
            }
        }
    } = await WebAssembly.instantiate(bytes);

    console.log(add(2,3));
}

answered May 10, 2022 at 18:06

TheAddonDepot

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Comments

Iamblichus · Accepted Answer · 2020-04-14 13:33:12Z

3

Asynchronous functionalities don't seem to be fully supported in V8 yet. There is actually an open Issue Tracker regarding this. You can click the star on the top left of the page to keep track of this issue.

In any case, please be aware that there is no explicit statement in the official documentation referring to the availability of these functionalities in V8. It just states that you can use keywords like async in your code, but it doesn't mention what functionality you will get if you use that.

Reference:

edited Apr 14, 2020 at 13:33

answered Apr 14, 2020 at 7:26

Iamblichus

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Comments

smcjones · Accepted Answer · 2024-09-24 15:00:38Z

1

This is a bit late, but make sure your functions are async all the way up to the top level.

Note the change before function add below:

let wasm= new Uint8Array([/* snip */]).buffer
async function add(a,b) {
  console.log("running function...")
  results=await WebAssembly.instantiate(wasm)
  return results.instance.exports.add(a,b)
}
function test(){
  add(2,3).then(console.log).catch(console.error)
}

answered Sep 24, 2024 at 15:00

smcjones

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