final ChannelPipeline pipeline = Channels.pipeline();
final ServletOutputStream out = res.getOutputStream();
final OutboundConnectionHandler handler = new OutboundConnectionHandler(out);
pipeline.addLast("handler", handler);
Channel channel = channelFactory.newChannel(pipeline);
ChannelFuture future = channel.connect(remoteAddress).awaitUninterruptibly();
if (!future.isSuccess()) {
if (logger.isWarnEnabled()) {
Throwable cause = future.getCause();
logger.warn("Endpoint unavailable: " + cause.getMessage(), cause);
}
res.sendError(HttpServletResponse.SC_SERVICE_UNAVAILABLE);
return;
}
ChannelFuture lastWriteFuture = null;
try {
res.setStatus(HttpServletResponse.SC_OK);
res.setHeader(HttpHeaders.Names.CONTENT_TYPE, "application/octet-stream");
res.setHeader(HttpHeaders.Names.CONTENT_TRANSFER_ENCODING, HttpHeaders.Values.BINARY);
// Initiate chunked encoding by flushing the headers.
out.flush();
PushbackInputStream in =
new PushbackInputStream(req.getInputStream());
while (channel.isConnected()) {
ChannelBuffer buffer;
try {
buffer = read(in);
} catch (EOFException e) {
break;
}
if (buffer == null) {
break;
}
lastWriteFuture = channel.write(buffer);
}
} finally {
if (lastWriteFuture == null) {
channel.close();
} else {
lastWriteFuture.addListener(ChannelFutureListener.CLOSE);
}
}
}