[BUG:] Memory leak and application crash RNFetchBlob.fs.readStream

[nikolaytsigvintsev]

Hi !

Problem:

 Memory leak and application crash

System:

react-native: 0.59.9
react: 16.9.0
react-native-fs: 2.14.1
iPad: 12.1
Xcode: 11.0

I can’t understand why there is a memory leak and application crash when reading a large file using the read() function

Example test code:

onReadAssets = async () => {
const url = ${node.asset.url} // <—— Large file
await RNFetchBlob.fs.readStream(${node.asset.url}, 'base64', 16777216, 500) // 16MB chunk,
        .then((stream) => {
          stream.open()
          let i = 0
          stream.onData((chunk) => {
            console.log('<------ Send chunk', i++)
          })
          stream.onEnd(() => {
          })
        })
}

Video report:

https://www.dropbox.com/s/2zfmua0tqhar9o7/Screen%20Recording%202019-10-25%20at%2017.21.40.mov?dl=0

The same problems:

itinance/react-native-fs#785
facebook/react-native#26972

Thanks !