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liweijian

•Created by liweijian on 6/30/2023 in #general-help

How to make `wrangler dev` run in background?

I wanna to create a wasm demo for internal usage: https://developers.cloudflare.com/workers/platform/webassembly/javascript/ I can run by wrangler dev in terminal, but need to keep the terminal. Is there any way to make it run in ubuntu's background?

2 replies

CDCloudflare Developers

•Created by liweijian on 6/30/2023 in #general-help

got `errno: -32` when `wrangler dev`

I'm using $ wrangler init to init a project, change the code of worker.ts, and run with wrangler dev, OS: Ubuntu 20.04 Node.js v18.16.0 Got error:

$ wrangler dev
 ...
[mf:wrn] The latest compatibility date supported by the installed Cloudflare Workers Runtime is "2023-05-18",
but you've requested "2023-06-30". Falling back to "2023-05-18"...
...
│ [b] open a browser, [d] open Devtools, [l] turn off local mode, [c] clear console, [x] to exit                                       │
...
/home/ubuntu/.nvm/versions/node/v18.16.0/lib/node_modules/wrangler/wrangler-dist/cli.js:30632
            throw a;
            ^

Error: write EPIPE
    at afterWriteDispatched (node:internal/stream_base_commons:160:15)
    at writeGeneric (node:internal/stream_base_commons:151:3)
    at Socket._writeGeneric (node:net:930:11)
    at Socket._write (node:net:942:8)
    at writeOrBuffer (node:internal/streams/writable:392:12)
    at _write (node:internal/streams/writable:333:10)
    at Writable.write (node:internal/streams/writable:337:10)
    at Runtime.updateConfig (/home/ubuntu/.nvm/versions/node/v18.16.0/lib/node_modules/wrangler/node_modules/miniflare/dist/src/index.js:5125:26)
    at async #assembleAndUpdateConfig (/home/ubuntu/.nvm/versions/node/v18.16.0/lib/node_modules/wrangler/node_modules/miniflare/dist/src/index.js:9140:23)
    at async #init (/home/ubuntu/.nvm/versions/node/v18.16.0/lib/node_modules/wrangler/node_modules/miniflare/dist/src/index.js:8902:5)
Emitted 'error' event on Socket instance at:
    at emitErrorNT (node:internal/streams/destroy:151:8)
    at emitErrorCloseNT (node:internal/streams/destroy:116:3)
    at process.processTicksAndRejections (node:internal/process/task_queues:82:21) {
  errno: -32,
  code: 'EPIPE',
  syscall: 'write'
}

Node.js v18.16.0

$ wrangler dev
 ...
[mf:wrn] The latest compatibility date supported by the installed Cloudflare Workers Runtime is "2023-05-18",
but you've requested "2023-06-30". Falling back to "2023-05-18"...
...
│ [b] open a browser, [d] open Devtools, [l] turn off local mode, [c] clear console, [x] to exit                                       │
...
/home/ubuntu/.nvm/versions/node/v18.16.0/lib/node_modules/wrangler/wrangler-dist/cli.js:30632
            throw a;
            ^

Error: write EPIPE
    at afterWriteDispatched (node:internal/stream_base_commons:160:15)
    at writeGeneric (node:internal/stream_base_commons:151:3)
    at Socket._writeGeneric (node:net:930:11)
    at Socket._write (node:net:942:8)
    at writeOrBuffer (node:internal/streams/writable:392:12)
    at _write (node:internal/streams/writable:333:10)
    at Writable.write (node:internal/streams/writable:337:10)
    at Runtime.updateConfig (/home/ubuntu/.nvm/versions/node/v18.16.0/lib/node_modules/wrangler/node_modules/miniflare/dist/src/index.js:5125:26)
    at async #assembleAndUpdateConfig (/home/ubuntu/.nvm/versions/node/v18.16.0/lib/node_modules/wrangler/node_modules/miniflare/dist/src/index.js:9140:23)
    at async #init (/home/ubuntu/.nvm/versions/node/v18.16.0/lib/node_modules/wrangler/node_modules/miniflare/dist/src/index.js:8902:5)
Emitted 'error' event on Socket instance at:
    at emitErrorNT (node:internal/streams/destroy:151:8)
    at emitErrorCloseNT (node:internal/streams/destroy:116:3)
    at process.processTicksAndRejections (node:internal/process/task_queues:82:21) {
  errno: -32,
  code: 'EPIPE',
  syscall: 'write'
}

Node.js v18.16.0

2 replies

CDCloudflare Developers

•Created by liweijian on 5/24/2023 in #workers-help

How to import javascript function from Wasm?

I'm trying to import a javascript function from Wasm. For the worker.ts, I defined a function consoleLog:

import mod from '../build/out.wasm';

const importObject = {
  imports: {
    consoleLog: (arg: number) => {
      console.log(`Hello from JavaScript: ${arg}`);
    },
  },
};

const instance = await WebAssembly.instantiate(mod, importObject);

export default {
  async fetch() {
    const retval = instance.exports.add100(2, 5);
    return new Response(`Success: ${retval}`);
  },
};

import mod from '../build/out.wasm';

const importObject = {
  imports: {
    consoleLog: (arg: number) => {
      console.log(`Hello from JavaScript: ${arg}`);
    },
  },
};

const instance = await WebAssembly.instantiate(mod, importObject);

export default {
  async fetch() {
    const retval = instance.exports.add100(2, 5);
    return new Response(`Success: ${retval}`);
  },
};

And I'm using AssemblyScript for the Wasm side:

declare function consoleLog(arg0: i32): void;

export function add100(a: i32, b: i32): i32 {  
  // consoleLog(100);
  return a + b + 100;
}

declare function consoleLog(arg0: i32): void;

export function add100(a: i32, b: i32): i32 {  
  // consoleLog(100);
  return a + b + 100;
}

Since I commented the //consoleLog(100); out, it works well after compile:

asc assembly/index.ts --outFile build/out.wasm --optimize

asc assembly/index.ts --outFile build/out.wasm --optimize

However, when I un-commented it as:

declare function consoleLog(arg0: i32): void;

export function add100(a: i32, b: i32): i32 {  
  consoleLog(100);
  return a + b + 100;
}

declare function consoleLog(arg0: i32): void;

export function add100(a: i32, b: i32): i32 {  
  consoleLog(100);
  return a + b + 100;
}

I got an error after asc:

service core:user:wasm102: Uncaught Error: No such module "bea1e1adde3b4c3c5cbc0842c823a3c93a930163-out.wasm".
  imported from "worker.js"
✘ [ERROR] MiniflareCoreError [ERR_RUNTIME_FAILURE]: The Workers runtime failed to start. There is likely additional logging output above.

service core:user:wasm102: Uncaught Error: No such module "bea1e1adde3b4c3c5cbc0842c823a3c93a930163-out.wasm".
  imported from "worker.js"
✘ [ERROR] MiniflareCoreError [ERR_RUNTIME_FAILURE]: The Workers runtime failed to start. There is likely additional logging output above.

Just wondering what's the appropriate way to import javascript function from Wasm?

2 replies

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