webwork | Execute Web Workers without external files | Architecture library
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Execute Web Workers without external files
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QUESTION
According to MDN, File
objects can be passed to Web Workers and they are properly cloned using the structured cloning algorithm. So far, so good. And this works in all browsers I've tested:
ANSWER
Answered 2021-May-30 at 23:26The File interface has its own serialization steps, which are not the ones of Javascript objects. So yes, your custom properties are lost because these steps don't include grabbing own properties.
Set serialized.[[SnapshotState]] to value’s snapshot state.
Set serialized.[[ByteSequence]] to value’s underlying byte sequence.
Set serialized.[[Name]] to the value of value’s name attribute.
Set serialized.[[LastModified]] to the value of value’s lastModified attribute.
QUESTION
I picked up Perl about a week ago and am now creating problems in WebWorK to help students practice their derivative skills. I would like to print out a table of questions and corresponding answer boxes in the least labor intensive way possible, since these questions will be mass produced.
Up to this point, I have been manually inputting the required code, and a lot of copy-pasting has been required. An example of the current structure is as follows:
...ANSWER
Answered 2021-May-26 at 17:55The TEXT()
function expects a list of values. Your for loop appears in this parameter list, where it is not useful, because it does not evaluate to a list of values.
Create the values before you call the TEXT()
function:
QUESTION
First of all, I know this topic looks really similar to this other topic talking about extending Express Request object using Typescript
Basically, I try to do the same thing but with Polka this time
Has anyone managed to do this?
The path I followed is similar to this
At project root lever I created this folder structure :
...ANSWER
Answered 2021-May-17 at 20:34I settled with first casting IncomingMessage
to Request
.
QUESTION
I am trying to implement a in browser raster drawing plugin for the leaflet library that that extends the leaflets GridLayer api. Essentially for every tile there is function createTile
that returns a canvas with some drawing on it. and leaflet shows the tile in correct position.
ANSWER
Answered 2021-May-16 at 01:48This a known bug: https://crbug.com/1202481
The issue appears when too many OffscreenCanvases are sent to the Worker serially.
The workaround is then to batch send all these OffscreenCanvases in a single call to postMessage()
.
In your code you could achieve this by storing all the objects to be sent and use a simple debouncing strategy using a 0 timeout to send them all at once:
QUESTION
For this service worker I am working on I have managed to get it working but am now looking to expand upon it. The idea would be for there to be separate mock data used dependant on whether it is the UK or US version of the website.
This is how it worked originally,
TestMode.ts:
...ANSWER
Answered 2021-May-10 at 09:26In case anyone else has the same issue as me. Check how your webpack config is setup, I had added a separate part to the config for the service worker and forgot ad:
QUESTION
I need some help with finding a memory leak in a small, Browser / WebWorker JavaScript. I tracked it down into this little piece of code:
...ANSWER
Answered 2021-Apr-19 at 02:00For the ImageBitmap to release its bitmap data the most efficient way, you have to call its .close()
method once you're done with it.
But actually, you don't need this scaleImage
function. createImageBitmap()
has a resizeHeight
option, and if you use it without the resizeWidth
one, you'll resize your image by keeping the aspect-ratio exacty like you are doing in your function, except that it won't need to assign the bitmap twice.
Once you have this resized ImageBitmap, you can transfer it to a BitmapRenderingContext (which will internally close()
the original ImageBitmap) and call the transferToBlob()
from that renderer.
This should be lighter for your computer.
QUESTION
function buildBlobUrl(func) {
let blobUrl = URL.createObjectURL(new Blob(['(',
func.toString(),
')()'
], {
type: 'application/javascript'
}));
return blobUrl;
}
function webWorkerFunction() {
let audio = new Audio();
}
let blobUrl = buildBlobUrl(webWorkerFunction);
let webWorker = new Worker(blobUrl);
...ANSWER
Answered 2021-Apr-16 at 02:58The Audio
constructor does return an HTMLAudioElement
DOM Element, and Web Workers don't have access to the DOM, we thus can't create DOM Elements from there.
And since we still can't really have a BaseAudioContext in a Worker either, there is no true alternative to playing this media 100% from the Worker.
QUESTION
I have a Cloudflare Worker that presents a registration form, accepts input from the user that is posted back to the Worker which then sends that on to an Node HTTP API elsewhere (DigitalOcean if that matters) that inserts the data into a MongoDB (though it could be any database). I control the code in both the CF-Worker and the API.
I am looking for the best way to secure this. I am currently figuring to include a pre-shared secret key in the API call request headers and I have locked down what this particular API can do with database access control. Is there an additional way for me to confirm that only the CF Webworker can call the API?
If this is obvious to some I apologize. I have always been of the mind that unless you are REALY good at security it is best to consult those who are.
...ANSWER
Answered 2021-Apr-14 at 11:20You can research OAuth2.0 standard. That is authorization standard for third party clients. Here is link: https://oauth.net/2/
This solution is the most professional.There are other less secure ways to do it, but easier to implement. Password and username, x-api-key, etc..
It sounds to me that you can also block all IPs and allow only requests from that specific domain name (CF Worker)
QUESTION
I am getting back error websocket: close sent when I try to send data from my server side to client side(dashboard page). The error happen when I navigate to home page and back to dashboard page. Everything works fine initially with the Dashboard Page
My dashboard page code
ANSWER
Answered 2021-Apr-12 at 20:18The basic strategy for dealing with navigation away from the page, page close or errors is this: The client creates the websocket connection on page load. The server expects client connections to come and go and cleans up resources when the client connection errors.
Here's why you get the error 'websocket: close sent': When the user navigates away from the page, the browser sends a close message to the server as part of the websocket closing handshake. The Gorilla package responds to the close message by sending another close message back to the client. From that point on, the server cannot send messages on the connection. The connection returns an error from write methods after the close message is sent.
Close messages are returned as errors from the websocket read methods. To fix the problem, modify the code to handle errors in general. There's no need to handle the closing handshake specifically.
Here's the updated code. The wsEndpoint
function creates a channel for the reader to signal the writer that the reader is done. The defer ws.Close()
statement is removed because the reader and writer goroutines will take responsibility for closing the connection.
QUESTION
Currently, I have set up a Vite 2 project with monaco-editor
as a dependency.
Whenever I am trying to use it says that the workers are not imported.
...ANSWER
Answered 2021-Jan-30 at 09:26With the latest release (2.0.0-beta.59
) it is fixed.
You can now add the environment workers without any further configuration (ref: https://github.com/vitejs/vite/discussions/1791)
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