FS.mount() throws an error when trying to mount local files with WORKERFS #328
Comments
|
Here is a reprex = https://github.com/ColinFay/webr-mount-reprex |
|
Same happens if I try to reproduce the code from the documentation, using fetch : const { WebR } = require('webr');
const webR = new WebR();
(async () => {
await webR.init();
// Create mountpoint
await webR.FS.mkdir('/data')
// Download image data
const data = await fetch('https://raw.githubusercontent.com/ColinFay/webr-mount-reprex/main/iris.data');
const metadata = await fetch('https://raw.githubusercontent.com/ColinFay/webr-mount-reprex/main/iris.js.metadata');
// Mount image data
const options = {
packages: [{
blob: await data.blob(),
metadata: await metadata.json(),
}],
}
await webR.FS.mount("WORKERFS", options, '/data');
})(); |
|
Thank you for reporting this and for the example, I can reproduce the bug at my end. It looks like the issue is specific to using the In the meantime, I know it might not be quite what you had in mind, but you should be able to use the alternative First, write the data you're interested in to disk in a new directory, $ mkdir data
$ Rscript -e 'write.csv(iris, "data/iris.csv")'Then, mount the new directory with const { WebR } = require('webr');
const webR = new WebR();
(async () => {
await webR.init();
await webR.FS.mkdir('/data');
await webR.FS.mount("NODEFS", { root: './data' }, '/data');
await webR.evalRVoid("print(head(read.csv('/data/iris.csv')))")
process.exit(1);
})(); |
|
Yeah this is what I've been doing so far (see https://colinfay.me/rethinking-packages-and-functions-preloading-in-webr-0.2.2/ for ex) but I want to package some stuff into a node module, and I feel like it would be better to upload the |
Instead, use our own `mountImageData()` function to create VFS nodes for each file in the VFS metadata package. TODO: This currently handles only metadata given in the form of the `packages` property. Emscripten supports additional `files` and `blobs` properties, and in the future we should also support those here. Fixes #328.
|
As of 4655e96, to be included in the next release of webR, mounting Note that in your original test script, the argument of const data = new Blob([
fs.readFileSync(
path.join(__dirname, 'iris.data')
)
]);It should also work when passing the Here is essentially the test script I've been using. Once we cut a new release of webR and it hits npm you should be able to try it out for yourself. const fs = require('fs');
const path = require('path');
const { WebR } = require('webr');
const webR = new WebR();
(async () => {
await webR.init();
const data = new Blob([
fs.readFileSync(
path.join(__dirname, 'iris.data')
)
])
const metadata = JSON.parse(
fs.readFileSync(
path.join(__dirname, 'iris.js.metadata')
)
);
await webR.FS.mkdir('/data');
const options = {
packages: [{
blob: data,
metadata: metadata,
}],
}
await webR.FS.mount("WORKERFS", options, '/data');
await webR.evalRVoid("print(file.info('/data/iris.csv'))")
await webR.evalRVoid("print(head(read.csv('/data/iris.csv')))")
process.exit(1);
})(); |
Following the example from https://docs.r-wasm.org/webr/latest/mounting.html#javascript-api
Here is a reprex.
Step 1, using the
ghcr.io/r-wasm/webrimage :Step 2, move to a node js script and try to load from disk
Even if both
dataandmetadataareconsole.loged, the process throws an error :I've tried using
But get the same result
The text was updated successfully, but these errors were encountered: