Function processChunk

src/js/app/utils/processFileChunked.js:144–238

        chunk.status === ChunkStatus.QUEUED || chunk.status === ChunkStatus.ERROR;

    const processChunk = chunk => {
        // processing is paused, wait here
        if (state.aborted) return;

        // get next chunk to process
        chunk = chunk || chunks.find(canProcessChunk);

        // no more chunks to process
        if (!chunk) {
            // all done?
            if (chunks.every(chunk => chunk.status === ChunkStatus.COMPLETE)) {
                completeProcessingChunks();
            }

            // no chunk to handle
            return;
        }

        // now processing this chunk
        chunk.status = ChunkStatus.PROCESSING;
        chunk.progress = null;

        // allow parsing of formdata
        const ondata = chunkServer.ondata || (fd => fd);
        const onerror = chunkServer.onerror || (res => null);
        const onload = chunkServer.onload || (() => {});

        // send request object
        const requestUrl = buildURL(apiUrl, chunkServer.url, state.serverId);

        const headers =
            typeof chunkServer.headers === 'function'
                ? chunkServer.headers(chunk)
                : {
                      ...chunkServer.headers,
                      'Content-Type': 'application/offset+octet-stream',
                      'Upload-Offset': chunk.offset,
                      'Upload-Length': file.size,
                      'Upload-Name': file.name,
                  };

        const request = (chunk.request = sendRequest(ondata(chunk.data), requestUrl, {
            ...chunkServer,
            headers,
        }));

        request.onload = xhr => {
            // allow hooking into request result
            onload(xhr, chunk.index, chunks.length);

            // done!
            chunk.status = ChunkStatus.COMPLETE;

            // remove request reference
            chunk.request = null;

            // start processing more chunks
            processChunks();