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.net.URI;
  import java.util.List;
  
  import joptsimple.OptionParser;
  import joptsimple.OptionSet;
  import joptsimple.OptionSpec;
  
  import org.apache.avro.Protocol;
  import org.apache.avro.Schema;
  import org.apache.avro.Protocol.Message;
  import org.apache.avro.generic.GenericDatumWriter;
  import org.apache.avro.io.DatumWriter;
  import org.apache.avro.io.EncoderFactory;
  import org.apache.avro.io.JsonEncoder;
  import org.apache.avro.ipc.Ipc;
  import org.apache.avro.ipc.generic.GenericRequestor;
  
  /**
   * Sends a single RPC message.
   */
  public class RpcSendTool implements Tool {
    @Override
    public String getName() {
      return "rpcsend";
    }
  
    @Override
    public String getShortDescription() {
      return "Sends a single RPC message.";
    }
  
    @Override
    public int run(InputStream in, PrintStream out, PrintStream err, List<String> args) throws Exception {
      OptionParser p = new OptionParser();
      OptionSpec<String> file = p.accepts("file", "Data file containing request parameters.").withRequiredArg()
          .ofType(String.class);
      OptionSpec<String> data = p.accepts("data", "JSON-encoded request parameters.").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);
      Message message = protocol.getMessages().get(messageName);
      if (message == null) {
        err.println(String.format("No message named '%s' found in protocol '%s'.", messageName, protocol));
        return 1;
      }
  
      Object datum;
      if (data.value(opts) != null) {
        datum = Util.jsonToGenericDatum(message.getRequest(), data.value(opts));
      } else if (file.value(opts) != null) {
        datum = Util.datumFromFile(message.getRequest(), file.value(opts));
      } else {
        err.println("One of -data or -file must be specified.");
        return 1;
      }
  
      GenericRequestor client = new GenericRequestor(protocol, Ipc.createTransceiver(uri));
      Object response = client.request(message.getName(), datum);
      dumpJson(out, message.getResponse(), response);
      return 0;
    }
  
    private void dumpJson(PrintStream out, Schema schema, Object datum) throws IOException {
      DatumWriter<Object> writer = new GenericDatumWriter<>(schema);
      JsonEncoder jsonEncoder = EncoderFactory.get().jsonEncoder(schema, out, true);
      writer.write(datum, jsonEncoder);
      jsonEncoder.flush();
      out.println();
      out.flush();
    }
  
  }
  