| /* |
| * 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 |
| * |
| * https://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)); |
| |
| try (Transceiver 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<>()).build(); |
| |
| DatumWriter<HandshakeRequest> handshakeWriter = new SpecificDatumWriter<>(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.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)); |
| |
| } |
| return 0; |
| } |
| } |