/**
* Flush the response contents to the output channel
*
* @param channel Channel to be used
*/
private void writeResponse(Channel channel) {
// Convert the response content to a ChannelBuffer.
ByteBuf buf = copiedBuffer(responseContent.toString(), CharsetUtil.UTF_8);
responseContent.setLength(0);
// Decide whether to close the connection or not.
boolean close =
HttpHeaders.Values.CLOSE.equalsIgnoreCase(request.headers().get(CONNECTION))
|| request.getProtocolVersion().equals(HttpVersion.HTTP_1_0)
&& !HttpHeaders.Values.KEEP_ALIVE.equalsIgnoreCase(
request.headers().get(CONNECTION));
// Build the response object.
FullHttpResponse response =
new DefaultFullHttpResponse(HttpVersion.HTTP_1_1, HttpResponseStatus.OK, buf);
response.headers().set(CONTENT_TYPE, "application/json; charset=UTF-8");
if (!close) {
// There's no need to add 'Content-Length' header
// if this is the last response.
response.headers().set(CONTENT_LENGTH, buf.readableBytes());
}
try {
// Write the response.
ChannelFuture future = channel.writeAndFlush(response);
// Close the connection after the write operation is done if necessary.
if (close) {
future.addListener(ChannelFutureListener.CLOSE);
}
} catch (Exception e) {
logger.error("{}", e);
}
}
/** {@inheritDoc} */
@Override
public void channelRead0(ChannelHandlerContext ctx, HttpObject msg) throws Exception {
if (msg instanceof HttpRequest) {
HttpRequest request = this.request = (HttpRequest) msg;
trackingType = setTrackingType(request);
}
if (msg instanceof HttpContent) {
// New chunk is received
HttpContent chunk = (HttpContent) msg;
requestContent.append(chunk.content().toString(Charset.defaultCharset()));
if (chunk instanceof LastHttpContent) {
// All chunks have been received
ResultTO resultTO = submitPayload(requestContent.toString());
responseContent.append(gson.toJson(resultTO));
writeResponse(ctx.channel());
reset();
}
}
}
@Override
public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
messageReceiveCount++;
if (msg instanceof HttpResponse) {
try {
HttpResponse response = (HttpResponse) msg;
StringBuilder sb = new StringBuilder();
if (LOG.isDebugEnabled()) {
sb.append("STATUS: ")
.append(response.getStatus())
.append(", VERSION: ")
.append(response.getProtocolVersion())
.append(", HEADER: ");
}
if (!response.headers().names().isEmpty()) {
for (String name : response.headers().names()) {
for (String value : response.headers().getAll(name)) {
if (LOG.isDebugEnabled()) {
sb.append(name).append(" = ").append(value);
}
if (this.length == -1 && name.equals("Content-Length")) {
this.length = Long.parseLong(value);
}
}
}
}
if (LOG.isDebugEnabled()) {
LOG.debug(sb.toString());
}
if (response.getStatus().code() == HttpResponseStatus.NO_CONTENT.code()) {
LOG.warn("There are no data corresponding to the request");
length = 0;
return;
} else if (response.getStatus().code() != HttpResponseStatus.OK.code()) {
LOG.error(response.getStatus().reasonPhrase());
state = TajoProtos.FetcherState.FETCH_FAILED;
return;
}
} catch (Exception e) {
LOG.error(e.getMessage(), e);
} finally {
ReferenceCountUtil.release(msg);
}
}
if (msg instanceof HttpContent) {
try {
HttpContent httpContent = (HttpContent) msg;
ByteBuf content = httpContent.content();
if (content.isReadable()) {
content.readBytes(fc, content.readableBytes());
}
if (msg instanceof LastHttpContent) {
if (raf != null) {
fileLen = file.length();
}
finishTime = System.currentTimeMillis();
if (state != TajoProtos.FetcherState.FETCH_FAILED) {
state = TajoProtos.FetcherState.FETCH_FINISHED;
}
IOUtils.cleanup(LOG, fc, raf);
}
} catch (Exception e) {
LOG.error(e.getMessage(), e);
} finally {
ReferenceCountUtil.release(msg);
}
}
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
logger.warn(responseContent.toString(), cause);
ctx.channel().close();
}