@Override
public HttpResponse toNettyResponse(Message message, NettyHttpConfiguration configuration)
throws Exception {
LOG.trace("toNettyResponse: {}", message);
// the message body may already be a Netty HTTP response
if (message.getBody() instanceof HttpResponse) {
return (HttpResponse) message.getBody();
}
// the response code is 200 for OK and 500 for failed
boolean failed = message.getExchange().isFailed();
int defaultCode = failed ? 500 : 200;
int code = message.getHeader(Exchange.HTTP_RESPONSE_CODE, defaultCode, int.class);
HttpResponse response =
new DefaultHttpResponse(HttpVersion.HTTP_1_1, HttpResponseStatus.valueOf(code));
LOG.trace("HTTP Status Code: {}", code);
TypeConverter tc = message.getExchange().getContext().getTypeConverter();
// append headers
// must use entrySet to ensure case of keys is preserved
for (Map.Entry<String, Object> entry : message.getHeaders().entrySet()) {
String key = entry.getKey();
Object value = entry.getValue();
// use an iterator as there can be multiple values. (must not use a delimiter)
final Iterator<?> it = ObjectHelper.createIterator(value, null);
while (it.hasNext()) {
String headerValue = tc.convertTo(String.class, it.next());
if (headerValue != null
&& headerFilterStrategy != null
&& !headerFilterStrategy.applyFilterToCamelHeaders(
key, headerValue, message.getExchange())) {
LOG.trace("HTTP-Header: {}={}", key, headerValue);
response.headers().add(key, headerValue);
}
}
}
Object body = message.getBody();
Exception cause = message.getExchange().getException();
// support bodies as native Netty
ChannelBuffer buffer;
// if there was an exception then use that as body
if (cause != null) {
if (configuration.isTransferException()) {
// we failed due an exception, and transfer it as java serialized object
ByteArrayOutputStream bos = new ByteArrayOutputStream();
ObjectOutputStream oos = new ObjectOutputStream(bos);
oos.writeObject(cause);
oos.flush();
IOHelper.close(oos, bos);
// the body should be the serialized java object of the exception
body = ChannelBuffers.copiedBuffer(bos.toByteArray());
// force content type to be serialized java object
message.setHeader(
Exchange.CONTENT_TYPE, NettyHttpConstants.CONTENT_TYPE_JAVA_SERIALIZED_OBJECT);
} else {
// we failed due an exception so print it as plain text
StringWriter sw = new StringWriter();
PrintWriter pw = new PrintWriter(sw);
cause.printStackTrace(pw);
// the body should then be the stacktrace
body = ChannelBuffers.copiedBuffer(sw.toString().getBytes());
// force content type to be text/plain as that is what the stacktrace is
message.setHeader(Exchange.CONTENT_TYPE, "text/plain");
}
// and mark the exception as failure handled, as we handled it by returning it as the response
ExchangeHelper.setFailureHandled(message.getExchange());
}
if (body instanceof ChannelBuffer) {
buffer = (ChannelBuffer) body;
} else {
// try to convert to buffer first
buffer = message.getBody(ChannelBuffer.class);
if (buffer == null) {
// fallback to byte array as last resort
byte[] data = message.getBody(byte[].class);
if (data != null) {
buffer = ChannelBuffers.copiedBuffer(data);
} else {
// and if byte array fails then try String
String str;
if (body != null) {
str = message.getMandatoryBody(String.class);
} else {
str = "";
}
buffer = ChannelBuffers.copiedBuffer(str.getBytes());
}
}
}
if (buffer != null) {
response.setContent(buffer);
// We just need to reset the readerIndex this time
if (buffer.readerIndex() == buffer.writerIndex()) {
buffer.setIndex(0, buffer.writerIndex());
}
// TODO How to enable the chunk transport
int len = buffer.readableBytes();
// set content-length
response.headers().set(HttpHeaders.Names.CONTENT_LENGTH, len);
LOG.trace("Content-Length: {}", len);
}
// set the content type in the response.
String contentType = MessageHelper.getContentType(message);
if (contentType != null) {
// set content-type
response.headers().set(HttpHeaders.Names.CONTENT_TYPE, contentType);
LOG.trace("Content-Type: {}", contentType);
}
// configure connection to accordingly to keep alive configuration
// favor using the header from the message
String connection = message.getHeader(HttpHeaders.Names.CONNECTION, String.class);
// Read the connection header from the exchange property
if (connection == null) {
connection = message.getExchange().getProperty(HttpHeaders.Names.CONNECTION, String.class);
}
if (connection == null) {
// fallback and use the keep alive from the configuration
if (configuration.isKeepAlive()) {
connection = HttpHeaders.Values.KEEP_ALIVE;
} else {
connection = HttpHeaders.Values.CLOSE;
}
}
response.headers().set(HttpHeaders.Names.CONNECTION, connection);
// Just make sure we close the channel when the connection value is close
if (connection.equalsIgnoreCase(HttpHeaders.Values.CLOSE)) {
message.setHeader(NettyConstants.NETTY_CLOSE_CHANNEL_WHEN_COMPLETE, true);
}
LOG.trace("Connection: {}", connection);
return response;
}
