func (r *fileReader) Read(data []byte) (int, error) {
if r.reader == nil {
// skip blocks as long as our offset is past the end of the current block
for r.offset != 0 && r.index < len(r.blockRefs) && r.offset >= int64(pfsserver.ByteRangeSize(r.blockRef().Range)) {
r.offset -= int64(pfsserver.ByteRangeSize(r.blockRef().Range))
r.index++
}
if r.index == len(r.blockRefs) {
return 0, io.EOF
}
var err error
client := client.APIClient{BlockAPIClient: r.blockClient}
r.reader, err = client.GetBlock(r.blockRef().Block.Hash, uint64(r.offset), uint64(r.size))
if err != nil {
return 0, err
}
r.offset = 0
r.index++
}
size, err := r.reader.Read(data)
if err != nil && err != io.EOF {
return size, err
}
if err == io.EOF {
r.reader = nil
}
r.size -= int64(size)
if r.size == 0 {
return size, io.EOF
}
if r.size < 0 {
return 0, fmt.Errorf("read more than we need; this is likely a bug")
}
return size, nil
}
