/*
Copyright (c) 2012 LinkedIn Corp.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package com.linkedin.d2.balancer.clients;
import java.net.URI;
import java.util.Map;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.linkedin.d2.balancer.LoadBalancerClient;
import com.linkedin.d2.balancer.util.LoadBalancerUtil;
import com.linkedin.jersey.api.uri.UriBuilder;
import com.linkedin.common.callback.Callback;
import com.linkedin.r2.message.Request;
import com.linkedin.r2.message.RequestContext;
import com.linkedin.r2.message.rest.RestRequest;
import com.linkedin.r2.message.rest.RestResponse;
import com.linkedin.r2.message.rpc.RpcRequest;
import com.linkedin.r2.message.rpc.RpcResponse;
import com.linkedin.r2.transport.common.bridge.client.TransportClient;
import com.linkedin.r2.transport.common.bridge.common.TransportCallback;
import com.linkedin.common.util.None;
import static com.linkedin.d2.discovery.util.LogUtil.debug;
public class RewriteClient implements LoadBalancerClient
{
private static final Logger _log = LoggerFactory.getLogger(TrackerClient.class);
private final String _serviceName;
private final URI _uri;
private final TransportClient _wrappedClient;
public RewriteClient(String serviceName, URI uri, TransportClient wrappedClient)
{
_serviceName = serviceName;
_uri = uri;
_wrappedClient = wrappedClient;
debug(_log, "created rewrite client: ", this);
}
@Override
public void restRequest(RestRequest request,
RequestContext requestContext,
Map<String, String> wireAttrs,
TransportCallback<RestResponse> callback)
{
_wrappedClient.restRequest(rewriteRequest(request),
requestContext,
wireAttrs,
callback);
}
@Override
@Deprecated
@SuppressWarnings("deprecation")
public void rpcRequest(RpcRequest request,
RequestContext requestContext,
Map<String, String> wireAttrs,
TransportCallback<RpcResponse> callback)
{
_wrappedClient.rpcRequest(rewriteRequest(request),
requestContext,
wireAttrs,
callback);
}
@Override
public void shutdown(Callback<None> callback)
{
_wrappedClient.shutdown(callback);
}
public TransportClient getWrappedClient()
{
return _wrappedClient;
}
@SuppressWarnings("unchecked")
private <M extends Request> M rewriteRequest(M req)
{
return (M)req.requestBuilder().setURI(rewriteUri(req.getURI())).build();
}
private URI rewriteUri(URI uri)
{
assert _serviceName.equals(LoadBalancerUtil.getServiceNameFromUri(uri));
String path = LoadBalancerUtil.getRawPathFromUri(uri);
UriBuilder builder = UriBuilder.fromUri(_uri);
if (path != null)
{
builder.path(path);
}
builder.replaceQuery(uri.getRawQuery());
builder.fragment(uri.getRawFragment());
URI rewrittenUri = builder.build();
debug(_log, "rewrite uri ", uri, " -> ", rewrittenUri);
return rewrittenUri;
}
@Override
public URI getUri()
{
return _uri;
}
public String getServiceName()
{
return _serviceName;
}
@Override
public String toString()
{
return "RewriteClient [_serviceName=" + _serviceName + ", _uri=" + _uri
+ ", _wrappedClient=" + _wrappedClient + "]";
}
}