library/src/test/java/org/apache/apex/malhar/lib/io/HttpJsonChunksInputOperatorTest.java

/**
 * 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.apex.malhar.lib.io;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.net.URI;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.codehaus.jettison.json.JSONException;
import org.codehaus.jettison.json.JSONObject;
import org.eclipse.jetty.server.Handler;
import org.eclipse.jetty.server.Request;
import org.eclipse.jetty.server.Server;
import org.eclipse.jetty.server.handler.AbstractHandler;
import org.junit.Assert;
import org.junit.Test;

import org.apache.apex.malhar.lib.testbench.CollectorTestSink;
import org.apache.commons.io.IOUtils;

/**
 * Functional test for {@linkcom.datatorrent.lib.io.HttpJsonChunksInputOperator }.
 */
public class HttpJsonChunksInputOperatorTest
{
  @SuppressWarnings({ "rawtypes", "unchecked" })
  @Test
  public void testHttpInputModule() throws Exception
  {

    final List<String> receivedMessages = new ArrayList<String>();
    Handler handler = new AbstractHandler()
    {
      int responseCount = 0;

      @Override
      public void handle(String string, Request rq, HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException
      {
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        IOUtils.copy(request.getInputStream(), bos);
        receivedMessages.add(new String(bos.toByteArray()));
        response.setContentType("application/json");
        response.setStatus(HttpServletResponse.SC_OK);
        response.setHeader("Transfer-Encoding", "chunked");
        try {
          JSONObject json = new JSONObject();
          json.put("responseId", "response" + ++responseCount);
          byte[] bytes = json.toString().getBytes();
          response.getOutputStream().println(bytes.length);
          response.getOutputStream().write(bytes);
          response.getOutputStream().println();
          response.getOutputStream().println(0);
          response.getOutputStream().flush();
        } catch (JSONException e) {
          response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, "Error generating response: " + e.toString());
        }

        ((Request)request).setHandled(true);
      }
    };

    Server server = new Server(0);
    server.setHandler(handler);
    server.start();

    String url = "http://localhost:" + server.getConnectors()[0].getLocalPort() + "/somecontext";
    final AbstractHttpInputOperator operator = new HttpJsonChunksInputOperator();

    CollectorTestSink sink = new CollectorTestSink();

    operator.outputPort.setSink(sink);
    operator.setUrl(new URI(url));

    operator.setup(null);
    operator.activate(null);

    int timeoutMillis = 3000;
    while (sink.collectedTuples.isEmpty() && timeoutMillis > 0) {
      operator.emitTuples();
      timeoutMillis -= 20;
      Thread.sleep(20);
    }

    Assert.assertTrue("tuple emitted", sink.collectedTuples.size() > 0);

    Map<String, String> tuple = (Map<String, String>)sink.collectedTuples.get(0);
    Assert.assertEquals("", tuple.get("responseId"), "response1");

    operator.deactivate();
    operator.teardown();
    server.stop();

  }
}