/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.avro.tool;
import org.apache.avro.Protocol;
import org.apache.avro.io.BinaryEncoder;
import org.apache.avro.io.DatumReader;
import org.apache.avro.io.DatumWriter;
import org.apache.avro.io.DecoderFactory;
import org.apache.avro.io.EncoderFactory;
import org.apache.avro.ipc.HandshakeRequest;
import org.apache.avro.ipc.HandshakeResponse;
import org.apache.avro.ipc.Ipc;
import org.apache.avro.ipc.MD5;
import org.apache.avro.ipc.Transceiver;
import org.apache.avro.specific.SpecificDatumReader;
import org.apache.avro.specific.SpecificDatumWriter;
import org.apache.avro.util.ByteBufferInputStream;
import org.apache.avro.util.ByteBufferOutputStream;
import java.io.InputStream;
import java.io.PrintStream;
import java.net.URI;
import java.nio.ByteBuffer;
import java.util.LinkedHashMap;
import java.util.List;
/**
* Tool to grab the protocol from a remote running service.
*/
public class RpcProtocolTool implements Tool {
@Override
public String getName() {
return "rpcprotocol";
}
@Override
public String getShortDescription() {
return "Output the protocol of a RPC service";
}
@Override
public int run(InputStream in, PrintStream out, PrintStream err, List<String> args) throws Exception {
if (args.size() != 1) {
err.println("Usage: uri");
return 1;
}
URI uri = URI.create(args.get(0));
Transceiver transceiver = null;
try {
transceiver = Ipc.createTransceiver(uri);
// write an empty HandshakeRequest
HandshakeRequest rq = HandshakeRequest.newBuilder()
.setClientHash(new MD5(new byte[16]))
.setServerHash(new MD5(new byte[16]))
.setClientProtocol(null)
.setMeta(new LinkedHashMap<String, ByteBuffer>())
.build();
DatumWriter<HandshakeRequest> handshakeWriter = new SpecificDatumWriter<HandshakeRequest>(HandshakeRequest.class);
ByteBufferOutputStream byteBufferOutputStream = new ByteBufferOutputStream();
BinaryEncoder encoder = EncoderFactory.get().binaryEncoder(byteBufferOutputStream, null);
handshakeWriter.write(rq, encoder);
encoder.flush();
// send it and get the response
List<ByteBuffer> response = transceiver.transceive(byteBufferOutputStream.getBufferList());
// parse the response
ByteBufferInputStream byteBufferInputStream = new ByteBufferInputStream(response);
DatumReader<HandshakeResponse> handshakeReader = new SpecificDatumReader<HandshakeResponse>(HandshakeResponse.class);
HandshakeResponse handshakeResponse = handshakeReader.read(null, DecoderFactory.get().binaryDecoder(byteBufferInputStream, null));
Protocol p = Protocol.parse(handshakeResponse.getServerProtocol());
// finally output the protocol
out.println(p.toString(true));
} finally {
if( transceiver != null )
transceiver.close();
}
return 0;
}
}