static void sendRedirect(
final ChannelHandlerContext ctx,
final ChannelEvent e,
final Class<? extends ComponentId> compClass,
final MappingHttpRequest request) {
e.getFuture().cancel();
String redirectUri = null;
if (Topology.isEnabled(compClass)) { // have an enabled service, lets use that
final URI serviceUri = ServiceUris.remote(Topology.lookup(compClass));
redirectUri =
serviceUri.toASCIIString() + request.getServicePath().replace(serviceUri.getPath(), "");
} else if (Topology.isEnabled(
Eucalyptus.class)) { // can't find service info, redirect via clc master
final URI serviceUri = ServiceUris.remote(Topology.lookup(Eucalyptus.class));
redirectUri =
serviceUri.toASCIIString().replace(Eucalyptus.INSTANCE.getServicePath(), "")
+ request.getServicePath().replace(serviceUri.getPath(), "");
}
HttpResponse response = null;
if (redirectUri == null || isRedirectLoop(request, redirectUri)) {
response =
new DefaultHttpResponse(HttpVersion.HTTP_1_1, HttpResponseStatus.SERVICE_UNAVAILABLE);
if (Logs.isDebug()) {
String errorMessage =
"Failed to lookup service for "
+ Components.lookup(compClass).getName()
+ " for path "
+ request.getServicePath()
+ ".\nCurrent state: \n\t"
+ Joiner.on("\n\t").join(Topology.enabledServices());
byte[] errorBytes = Exceptions.string(new ServiceStateException(errorMessage)).getBytes();
response.setContent(ChannelBuffers.wrappedBuffer(errorBytes));
}
} else {
response =
new DefaultHttpResponse(HttpVersion.HTTP_1_1, HttpResponseStatus.TEMPORARY_REDIRECT);
if (request.getQuery() != null) {
redirectUri += "?" + request.getQuery();
}
response.setHeader(HttpHeaders.Names.LOCATION, redirectUri);
}
response.setHeader(HttpHeaders.Names.CONNECTION, HttpHeaders.Values.CLOSE);
if (ctx.getChannel().isConnected()) {
ctx.getChannel().write(response).addListener(ChannelFutureListener.CLOSE);
}
}
@Override
protected void encodeInitialLine(final ChannelBuffer buf, final HttpMessage message)
throws Exception {
final MappingHttpRequest request = (MappingHttpRequest) message;
buf.writeBytes(request.getMethod().toString().getBytes("ASCII"));
buf.writeByte(HttpUtils.SP);
buf.writeBytes(request.getServicePath().getBytes("ASCII"));
buf.writeByte(HttpUtils.SP);
buf.writeBytes(request.getProtocolVersion().toString().getBytes("ASCII"));
buf.writeBytes(HttpUtils.CRLF);
}
private static boolean isRedirectLoop(final MappingHttpRequest request, final String uri) {
final String requestHost = request.getHeader(HttpHeaders.Names.HOST);
final String requestPath = request.getServicePath();
return requestHost != null && requestPath != null && uri.contains(requestHost + requestPath);
}
