[React Native] Can currently only create a blob from other Blobs

[hasancanozkan]

Hi, I have a RN application and just want to try parallel programming using hamsters.js. First, I created a demo app to try it with a worker, namely https://github.com/fabriciovergal/react-native-workers. however I am getting a strange error,
What version of the library --> 4.2.0
What operating system are you seeing the issue on? --> Windows
Which platform (and or) browser are you seeing the issue on? React Native on andorid
What is the version of the platform (and or) browser you are seeing the issue on? --> RN 48.0
The code that I wrote simply (i saw this in how the library manages your data) :
initHamsters(){
const startOptions = {
maxThreads: 4,
cache: false,
debug: false,
persistence: false,
Worker: Worker
};
hamsters.init(startOptions);
const params = {
array: [1,2,3,4,5,6,7,8,9,10],
animal: 'Hamster',
};
hamsters.run(params, function() {
if(params.animal === 'Hamster') {
rtn.data.push('Hamsters are awesome');
}
}, function(result) {
console.log(result);
});
}
I have to say that there is not so many worker libraries availalbler for react native, and the one that I found was working, i tried it. However, it has some requirements like using two ports and having index.worker.js and I didnt provide them to run this code. the error is like this :

and as I understand this is a react native error, which doesnt allow to use this library and Worker library.
Any ideas?

[austinksmith]

This is an interesting issue and it seems to revolve around ReactNative not supporting data blobs all of a sudden? In the past data blobs worked fine and unfortunately the library is somewhat reliant on that capability since its the most efficient way to accomplish the functionality I needed, I will have to look into this deeper and possibly even change how data is being passed in the event it's running inside ReactNative. If you know of a external module to make use of DataBlobs within ReactNative please give that a try and let me know if that helps at all. If it's necessary now to use a third party DataBlob plugin then that is unfortunate but at least I can ensure the documentation reflects that.

…

On Tue, Sep 5, 2017 at 1:23 PM, hsncnzkn ***@***.***> wrote: Hi, I have a RN application and just want to try parallel programming using hamsters.js. First, I created a demo app to try it with a worker, namely https://github.com/fabriciovergal/react-native-workers. however I am getting a strange error, What version of the library --> 4.2.0 What operating system are you seeing the issue on? --> Windows Which platform (and or) browser are you seeing the issue on? React Native on andorid What is the version of the platform (and or) browser you are seeing the issue on? --> RN 48.0 The code that I wrote simply (i saw this in how the library manages your data) : initHamsters(){ const startOptions = { maxThreads: 4, cache: false, debug: false, persistence: false, Worker: Worker }; hamsters.init(startOptions); const params = { array: [1,2,3,4,5,6,7,8,9,10], animal: 'Hamster', }; hamsters.run(params, function() { if(params.animal === 'Hamster') { rtn.data.push('Hamsters are awesome'); } }, function(result) { console.log(result); }); } I have to say that there is not so many worker libraries availalbler for react native, and the one that I found was working, i tried it. However, it has some requirements like using two ports and having index.worker.js and I didnt provide them to run this code. the error is like this : [image: img_1313] <https://user-images.githubusercontent.com/15143230/30073766-65465e88-926f-11e7-8aae-4aa135db3672.JPG> and as I understand this is a react native error, which doesnt allow to use this library and Worker library. Any ideas? — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#40>, or mute the thread <https://github.com/notifications/unsubscribe-auth/ACH-I_28KWVC5VByvC_pXS7Kz2gCc1hgks5sfYN7gaJpZM4PNRHq> .

[austinksmith]

Cross referencing this bug report facebook/react-native#16034

[amos80m]

same problem

[austinksmith]

We are still waiting for this to land, looks like it wont be official until 0.53 at the earliest. facebook/react-native#11573

Fortunately the new version of Hamsters.js will include a workaround for this, though it's not ideal it should get us past this issue once and for all.

[satya164]

This is an interesting issue and it seems to revolve around ReactNative not supporting data blobs all of a sudden

FYI React Native never supported Blobs.

[amos80m]

I moved my code to Heroku => post the image file and send it to Firestore.
working 100%

[austinksmith]

@satya164 I can definitively say the library worked flawlessly (Android 4.0+) when I first started developing using ReactNative about a year and a half ago. Blob support was never an issue, whether it really worked or just failed silently the library never had an issue running until recent version of RN were released. Perhaps it has something to do with their push for the new fiber stuff.

There is a solution to this problem but it requires using the external common/wheel.min.js file instead of blobs similarly to how IE10 support works (microsoft security problems)

[austinksmith]

@amos80m You solved the problem within Hamsters.js or the problem within ReactNative? I'm not sure i follow.

[satya164]

It's not related to Fiber. There was no Blob object available earlier. Blob support was added recently, but it's not full-featured yet. If your code had a fallback without blobs, it was probably working, and if not, it was failing silently.

[austinksmith]

Can you give dev branch a try alongside react-native-threads? Just make sure you import the library as laid out below. Apologies for the long delay, next version is a complete ground up rewrite of the library and its taken a long time to get it where I want.

import { Thread } from 'react-native-threads';

and then do this on your library startup

hamsters.init({
  Worker: Thread
});

Please report back your results, I'm nearing completion on the next library version and react native support is important, thanks!

[austinksmith]

I do not have access to any systems that will allow me to test react native support especially for IOS or AppleTV etc. I will need the community to validate this works.

[amos80m]

@austinksmith I created a Node.j.s App that receive images files as post from react native app.
the Node.js App is connected as an Admin to firebase and saving my uploaded images to firestore.
and i can upload as many images and sizes as I need without any issues

[austinksmith]

I've released version 5.0.0 of Hamsters.js, this should resolve any outstanding react native issues but please open a ticket if it does not 👍 thanks!

https://github.com/austinksmith/Hamsters.js/releases/tag/v5.0.0