content: /*
   * 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 java.io.IOException;
  import java.io.InputStream;
  import java.io.PrintStream;
  import java.io.File;
  import java.util.List;
  import java.util.concurrent.CountDownLatch;
  import java.net.URI;
  
  import joptsimple.OptionParser;
  import joptsimple.OptionSet;
  import joptsimple.OptionSpec;
  
  import org.apache.avro.AvroRemoteException;
  import org.apache.avro.Protocol;
  import org.apache.avro.Protocol.Message;
  import org.apache.avro.generic.GenericDatumWriter;
  import org.apache.avro.io.EncoderFactory;
  import org.apache.avro.io.JsonEncoder;
  import org.apache.avro.ipc.Ipc;
  import org.apache.avro.ipc.Server;
  import org.apache.avro.ipc.generic.GenericResponder;
  
  /**
   * Receives one RPC call and responds. (The moral equivalent of "netcat".)
   */
  public class RpcReceiveTool implements Tool {
    private PrintStream out;
    private Object response;
    /** Used to communicate between server thread (responder) and run() */
    private CountDownLatch latch;
    private Message expectedMessage;
    Server server;
  
    @Override
    public String getName() {
      return "rpcreceive";
    }
  
    @Override
    public String getShortDescription() {
      return "Opens an RPC Server and listens for one message.";
    }
  
    private class SinkResponder extends GenericResponder {
  
      public SinkResponder(Protocol local) {
        super(local);
      }
  
      @Override
      public Object respond(Message message, Object request) throws AvroRemoteException {
        if (!message.equals(expectedMessage)) {
          out.println(
              String.format("Expected message '%s' but received '%s'.", expectedMessage.getName(), message.getName()));
          latch.countDown();
          throw new IllegalArgumentException("Unexpected message.");
        }
        out.print(message.getName());
        out.print("\t");
        try {
          JsonEncoder jsonEncoder = EncoderFactory.get().jsonEncoder(message.getRequest(), out);
          GenericDatumWriter<Object> writer = new GenericDatumWriter<>(message.getRequest());
          writer.write(request, jsonEncoder);
          jsonEncoder.flush();
          out.flush();
        } catch (IOException e) {
          throw new RuntimeException(e);
        }
        out.println();
        new Thread(() -> {
          try {
            Thread.sleep(1000);
          } catch (InterruptedException e) {
          }
          latch.countDown();
        }).start();
        return response;
      }
    }
  
    @Override
    public int run(InputStream in, PrintStream out, PrintStream err, List<String> args) throws Exception {
      // Split up into two functions for easier testing.
      int r = run1(in, out, err, args);
      if (r != 0) {
        return r;
      }
      return run2(err);
    }
  
    int run1(InputStream in, PrintStream out, PrintStream err, List<String> args) throws Exception {
      OptionParser p = new OptionParser();
      OptionSpec<String> file = p.accepts("file", "Data file containing response datum.").withRequiredArg()
          .ofType(String.class);
      OptionSpec<String> data = p.accepts("data", "JSON-encoded response datum.").withRequiredArg().ofType(String.class);
      OptionSet opts = p.parse(args.toArray(new String[0]));
      args = (List<String>) opts.nonOptionArguments();
  
      if (args.size() != 3) {
        err.println("Usage: uri protocol_file message_name (-data d | -file f)");
        p.printHelpOn(err);
        return 1;
      }
  
      URI uri = new URI(args.get(0));
      Protocol protocol = Protocol.parse(new File(args.get(1)));
      String messageName = args.get(2);
      expectedMessage = protocol.getMessages().get(messageName);
      if (expectedMessage == null) {
        err.println(String.format("No message named '%s' found in protocol '%s'.", messageName, protocol));
        return 1;
      }
      if (data.value(opts) != null) {
        this.response = Util.jsonToGenericDatum(expectedMessage.getResponse(), data.value(opts));
      } else if (file.value(opts) != null) {
        this.response = Util.datumFromFile(expectedMessage.getResponse(), file.value(opts));
      } else {
        err.println("One of -data or -file must be specified.");
        return 1;
      }
  
      this.out = out;
  
      latch = new CountDownLatch(1);
      server = Ipc.createServer(new SinkResponder(protocol), uri);
      server.start();
      out.println("Port: " + server.getPort());
      return 0;
    }
  
    int run2(PrintStream err) throws InterruptedException {
      latch.await();
      err.println("Closing server.");
      server.close();
      return 0;
    }
  
  }
  