/**
* Provided a cause, returns an error response with the right status and error message.
*
* @param cause the cause of the error.
* @return a {@link FullHttpResponse} with the error message that can be sent to the client.
*/
private FullHttpResponse getErrorResponse(Throwable cause) {
HttpResponseStatus status;
StringBuilder errReason = new StringBuilder();
if (cause instanceof RestServiceException) {
RestServiceErrorCode restServiceErrorCode = ((RestServiceException) cause).getErrorCode();
status = getHttpResponseStatus(ResponseStatus.getResponseStatus(restServiceErrorCode));
if (status == HttpResponseStatus.BAD_REQUEST) {
errReason.append(" [").append(Utils.getRootCause(cause).getMessage()).append("]");
}
} else {
nettyMetrics.internalServerErrorCount.inc();
status = HttpResponseStatus.INTERNAL_SERVER_ERROR;
}
String fullMsg = "Failure: " + status + errReason;
logger.trace("Constructed error response for the client - [{}]", fullMsg);
FullHttpResponse response;
if (request != null && !request.getRestMethod().equals(RestMethod.HEAD)) {
response =
new DefaultFullHttpResponse(
HttpVersion.HTTP_1_1, status, Unpooled.wrappedBuffer(fullMsg.getBytes()));
} else {
// for HEAD, we cannot send the actual body but we need to return what the length would have
// been if this was GET.
// https://www.w3.org/Protocols/rfc2616/rfc2616-sec9.html (Section 9.4)
response = new DefaultFullHttpResponse(HttpVersion.HTTP_1_1, status);
}
HttpHeaders.setDate(response, new GregorianCalendar().getTime());
HttpHeaders.setContentLength(response, fullMsg.length());
HttpHeaders.setHeader(response, HttpHeaders.Names.CONTENT_TYPE, "text/plain; charset=UTF-8");
boolean keepAlive =
request != null
&& !request.getRestMethod().equals(RestMethod.POST)
&& !CLOSE_CONNECTION_ERROR_STATUSES.contains(status);
HttpHeaders.setKeepAlive(response, keepAlive);
return response;
}
