this prevents the copier from sending messages in the buffer to the closed
driver. If the copied took longer than the timeout to drain the buffer, this
aborts the copier read loop and return back so we can cleanup resources
properly.
Signed-off-by: Daniel Dao <dqminh@cloudflare.com>
When using a scanner, log lines over 64K will crash the Copier with
bufio.ErrTooLong. Subsequently, the ioutils.bufReader will grow without
bound as the logs are no longer being flushed to disk.
Signed-off-by: Burke Libbey <burke.libbey@shopify.com>
