RNFetchBlob.fs.exists crashes if the file not exist in the gallery (content://) on android

[jonathangreco]

Hi

I've an issue about the RNFetchBlob.fs.exists() method.

Context :

• I've an app that record some videos
• this app stores recorded video using the CameraRoll component.
• Videos are stored in the gallery (content://media/external/video/media/296)

I've tested two things :

• The video exist in the gallery
• The video does not exist (remove manually by the user)

The code :

async componentDidMount() {
    const {scene} = this.props;
// scene.film is the uri like content://media/external/video/media/296 (android only at the moment)
    if (scene.film) {
      RNFetchBlob.fs.exists(scene.film)
        .then((exist) => {
          console.log(`file ${exist ? '' : 'not'} exists`)
        })
        .catch((err) => { console.log(err) });

      this.setState({jsx: this.renderFilm(scene)});
    } else {
      this.setState({jsx: this.renderImage()});
    }
  }

Version:

"react-native": "0.56.0",
"rn-fetch-blob": "^0.10.12"

The issue

If the file exist, everything works and console log print :

If the file has been removed the app crashes and shutdown.
This behaviour have been tested on android 7.0, API 24 the device is : SM-T580

[jonathangreco]

It would be nice if someone can reproduce the bug, to confirm it.

Also, if my issue is not clear please tell me.

This bug is really annoying as there is no workaround yet, I didn't found any.

[jonathangreco]

Hi is this resolved ?

[zibs]

I came across this just now too @jonathangreco -- essentially .exists() crashes the android application, but I'm actually able to still base64 it, I just don't check it's existence first, which feels sad.

[jonathangreco]

@zibs Thanks I still have this issue now and I just use an ugly workaround like this :

// if it's not exist, catch method will know about it :)
  await RNFS.stat(item.uri).then((stat) => {
        // Yolooooooooooooo
      })
        .catch(() => {
          this.doSomthingfalse);
        });

Well like you see here even RNFS can't make a proper exist method (it's not handle the content:// return always false)

[DevAelius]

_method = () => {
RNFetchBlob.fs.exists('/storage/emulated/0/Download/' + 'download.jpeg')
.then((fileisThere) => {
console.log('status', fileisThere)
fileisThere ?
console.log('ok') :
console.log('!=ok')

  }).catch((err) => {
    console.log(err)
  })

}

[tmaly1980]

I'm getting crashes with RNFetchBlob.fs.exists as well, and I'm not sure why. Is using stat() the best workaround?

[tmaly1980]

@DevAelius What is your comment about?

[jonathangreco]

Since I used stats I was able to make the trick and never crashed. My App is in production and all light are green ;)

What version of react-native do you use ?

[tmaly1980]

@jonathangreco I'm using RN 0.60.5, though I've finally found my problem (slightly different issue):

#469

[dbilgin]

Using stat() fails to return the correct value for content: files on android. @tmaly1980's fix seems like it would fix this issue.