protected String handleRequest(
Channel channel, StreamInput buffer, long requestId, Version version) throws IOException {
final String action = buffer.readString();
final NettyTransportChannel transportChannel =
new NettyTransportChannel(transport, action, channel, requestId, version);
try {
final TransportRequestHandler handler = transportServiceAdapter.handler(action);
if (handler == null) {
throw new ActionNotFoundTransportException(action);
}
final TransportRequest request = handler.newInstance();
request.remoteAddress(
new InetSocketTransportAddress((InetSocketAddress) channel.getRemoteAddress()));
request.readFrom(buffer);
if (handler.executor() == ThreadPool.Names.SAME) {
//noinspection unchecked
handler.messageReceived(request, transportChannel);
} else {
threadPool
.executor(handler.executor())
.execute(new RequestHandler(handler, request, transportChannel, action));
}
} catch (Throwable e) {
try {
transportChannel.sendResponse(e);
} catch (IOException e1) {
logger.warn("Failed to send error message back to client for action [" + action + "]", e);
logger.warn("Actual Exception", e1);
}
}
return action;
}
@Override
public void messageReceived(ChannelHandlerContext ctx, MessageEvent e) throws Exception {
Object m = e.getMessage();
if (!(m instanceof ChannelBuffer)) {
ctx.sendUpstream(e);
return;
}
ChannelBuffer buffer = (ChannelBuffer) m;
int size = buffer.getInt(buffer.readerIndex() - 4);
transportServiceAdapter.received(size + 6);
// we have additional bytes to read, outside of the header
boolean hasMessageBytesToRead = (size - (NettyHeader.HEADER_SIZE - 6)) != 0;
int markedReaderIndex = buffer.readerIndex();
int expectedIndexReader = markedReaderIndex + size;
// netty always copies a buffer, either in NioWorker in its read handler, where it copies to a
// fresh
// buffer, or in the cumlation buffer, which is cleaned each time
StreamInput streamIn = ChannelBufferStreamInputFactory.create(buffer, size);
long requestId = buffer.readLong();
byte status = buffer.readByte();
Version version = Version.fromId(buffer.readInt());
StreamInput wrappedStream;
if (TransportStatus.isCompress(status) && hasMessageBytesToRead && buffer.readable()) {
Compressor compressor = CompressorFactory.compressor(buffer);
if (compressor == null) {
int maxToRead = Math.min(buffer.readableBytes(), 10);
int offset = buffer.readerIndex();
StringBuilder sb =
new StringBuilder("stream marked as compressed, but no compressor found, first [")
.append(maxToRead)
.append("] content bytes out of [")
.append(buffer.readableBytes())
.append("] readable bytes with message size [")
.append(size)
.append("] ")
.append("] are [");
for (int i = 0; i < maxToRead; i++) {
sb.append(buffer.getByte(offset + i)).append(",");
}
sb.append("]");
throw new ElasticsearchIllegalStateException(sb.toString());
}
wrappedStream = CachedStreamInput.cachedHandlesCompressed(compressor, streamIn);
} else {
wrappedStream = CachedStreamInput.cachedHandles(streamIn);
}
wrappedStream.setVersion(version);
if (TransportStatus.isRequest(status)) {
String action = handleRequest(ctx.getChannel(), wrappedStream, requestId, version);
if (buffer.readerIndex() != expectedIndexReader) {
if (buffer.readerIndex() < expectedIndexReader) {
logger.warn(
"Message not fully read (request) for [{}] and action [{}], resetting",
requestId,
action);
} else {
logger.warn(
"Message read past expected size (request) for [{}] and action [{}], resetting",
requestId,
action);
}
buffer.readerIndex(expectedIndexReader);
}
} else {
TransportResponseHandler handler = transportServiceAdapter.remove(requestId);
// ignore if its null, the adapter logs it
if (handler != null) {
if (TransportStatus.isError(status)) {
handlerResponseError(wrappedStream, handler);
} else {
handleResponse(ctx.getChannel(), wrappedStream, handler);
}
} else {
// if its null, skip those bytes
buffer.readerIndex(markedReaderIndex + size);
}
if (buffer.readerIndex() != expectedIndexReader) {
if (buffer.readerIndex() < expectedIndexReader) {
logger.warn(
"Message not fully read (response) for [{}] handler {}, error [{}], resetting",
requestId,
handler,
TransportStatus.isError(status));
} else {
logger.warn(
"Message read past expected size (response) for [{}] handler {}, error [{}], resetting",
requestId,
handler,
TransportStatus.isError(status));
}
buffer.readerIndex(expectedIndexReader);
}
}
wrappedStream.close();
}
@Override
public void writeComplete(ChannelHandlerContext ctx, WriteCompletionEvent e) throws Exception {
transportServiceAdapter.sent(e.getWrittenAmount());
super.writeComplete(ctx, e);
}