How to catch something when downloading is interruppted?

[liuxiaoy]

    let task = RNFetchBlob.config({
        path : path
    }).fetch('POST', url, {
        'Content-Type': 'octet-stream'
    });
    task.progress(progressCallback);// listen to download progress event
    task.then((response) => {
        if (response.respInfo.status >= 200 && response.respInfo.status < 300) {
            callback(null, response.path());
        } else
            callback({error: 'fail', message: 'Server Exception ' + response.respInfo.status || ''});
    }).catch(e => {
        console.log(e);
        callback({error: 'fail', message: '当前网络无法访问'});
    });

when the downloading task is interruppted or canceled,it will run to " callback(null, response.path());" always.

[wkh237]

@liuxiaoy , thanks fro reporting this issue. Does it happen on both Android and IOS ?

[liuxiaoy]

@wkh237 Sorry! I have only try it on android.

[wkh237]

@liuxiaoy , I've setup some tests on this issue but unfortunately still not be able to replicate the problem you addressed.

The behavior was just as expected, catch block executed upon timeout, socket close, and server unreachable. Could you provide a more detailed test case?

[liuxiaoy]

@wkh237
step1:RNFetchBlobReq.java
...
case FileStorage:
try {
// In order to write response data to destPath we have to invoke this method.
// It uses customized response body which is able to report download progress
// and write response data to destination path.
resp.body().bytes();
} catch (Exception ignored) {
// ignored.printStackTrace();
}
...
step2:ResponseBody.java in okhttp-3.4.1.sources.jar
...
public final byte[] bytes() throws IOException {
long contentLength = contentLength();
if (contentLength > Integer.MAX_VALUE) {
throw new IOException("Cannot buffer entire body for content length: " + contentLength);
}

BufferedSource source = source();
byte[] bytes;
try {
  bytes = source.readByteArray();
} finally {
  Util.closeQuietly(source);
}
if (contentLength != -1 && contentLength != bytes.length) {
  throw new IOException("Content-Length and stream length disagree");
}
return bytes;

}
...
step3:RealBufferedSource.java in okio-1.9.0-sources.jar
...
@OverRide
public byte[] readByteArray() throws IOException {
buffer.writeAll(source);
return buffer.readByteArray();
}
...

If the downloading task was canceled or interrupered,it will run to " throw new IOException("Content-Length and stream length disagree");" on step2. But the Exception ignored is ignored on step1. At last it seems like the task success in javascript.

[liuxiaoy]

"react-native-fetch-blob": "^0.10.0",
"react": "^15.4.1",
"react-native": "^0.39.0",

[wkh237]

Okay, I can replicate it now, this only happens when interrupting a request which downloads data to storage, will look into this issue.