GenericWebhookResource.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
 *
 *   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.streams.dropwizard;

import org.apache.streams.core.StreamsDatum;
import org.apache.streams.core.StreamsProvider;
import org.apache.streams.core.StreamsResultSet;
import org.apache.streams.jackson.StreamsJacksonMapper;
import org.apache.streams.util.ComponentUtils;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.node.ObjectNode;
import com.google.common.base.Splitter;
import org.joda.time.DateTime;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.math.BigInteger;
import java.util.Queue;
import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.concurrent.locks.ReadWriteLock;
import java.util.concurrent.locks.ReentrantReadWriteLock;
import java.util.regex.Pattern;
import javax.annotation.Resource;
import javax.ws.rs.Consumes;
import javax.ws.rs.POST;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.HttpHeaders;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;

/**
 * GenericWebhookResource provides basic webhook connectivity.
 *
 * <p/>
 * Add processors / persistWriters that read from "GenericWebhookResource" to
 * consume data posted to streams.
 */
@Resource
@Path("/streams/webhooks")
@Produces(MediaType.APPLICATION_JSON)
@Consumes(MediaType.APPLICATION_JSON)
public class GenericWebhookResource implements StreamsProvider {

  public static final String STREAMS_ID = "GenericWebhookResource";

  public GenericWebhookResource() {
  }

  private static final Logger log = LoggerFactory
      .getLogger(GenericWebhookResource.class);

  private static ObjectMapper mapper = StreamsJacksonMapper.getInstance();

  protected Queue<StreamsDatum> providerQueue = new ConcurrentLinkedQueue<>();

  protected final ReadWriteLock lock = new ReentrantReadWriteLock();

  private static Pattern newLinePattern = Pattern.compile("(\\r\\n?|\\n)", Pattern.MULTILINE);

  @Override
  public String getId() {
    return STREAMS_ID;
  }

  /**
   * push a String json datum into a stream.
   * @param headers HttpHeaders
   * @param body String json
   * @return Response
   */
  @POST
  @Path("json")
  public Response json(@Context HttpHeaders headers,
                       String body) {

    ObjectNode response = mapper.createObjectNode();
    int responseCode = Response.Status.BAD_REQUEST.getStatusCode();

    try {
      ObjectNode item = mapper.readValue(body, ObjectNode.class);

      StreamsDatum datum = new StreamsDatum(body);

      lock.writeLock().lock();
      ComponentUtils.offerUntilSuccess(datum, providerQueue);
      lock.writeLock().unlock();

      Boolean success = true;

      response.put("success", success);

      responseCode = Response.Status.OK.getStatusCode();

    } catch (Exception ex) {
      log.warn(ex.toString(), ex);

      Boolean success = false;

      response.put("success", success);
      responseCode = Response.Status.BAD_REQUEST.getStatusCode();

    } finally {
      return Response.status(responseCode).entity(response).build();
    }
  }

  /**
   * push multiple String json datums into a stream.
   * @param headers HttpHeaders
   * @param body String json
   * @return Response
   */
  @POST
  @Path("json_new_line")
  public Response json_new_line(@Context HttpHeaders headers,
                                String body) {

    ObjectNode response = mapper.createObjectNode();
    int responseCode = Response.Status.BAD_REQUEST.getStatusCode();

    if (body.equalsIgnoreCase("{}")) {

      Boolean success = true;

      response.put("success", success);
      responseCode = Response.Status.OK.getStatusCode();
      return Response.status(responseCode).entity(response).build();
    }

    try {

      for (String line : Splitter.on(newLinePattern).split(body)) {
        ObjectNode item = mapper.readValue(line, ObjectNode.class);

        StreamsDatum datum = new StreamsDatum(item);

        lock.writeLock().lock();
        ComponentUtils.offerUntilSuccess(datum, providerQueue);
        lock.writeLock().unlock();

      }

      Boolean success = true;

      response.put("success", success);
      responseCode = Response.Status.OK.getStatusCode();

    } catch (Exception ex) {
      log.warn(ex.toString(), ex);

      Boolean success = false;

      response.put("success", success);
      responseCode = Response.Status.BAD_REQUEST.getStatusCode();

    } finally {
      return Response.status(responseCode).entity(response).build();

    }

  }

  /**
   * push multiple ObjectNode json datums into a stream.
   * @param headers HttpHeaders
   * @param body String json
   * @return Response
   */
  @POST
  @Path("json_meta")
  public Response json_meta(@Context HttpHeaders headers,
                            String body) {

    ObjectNode response = mapper.createObjectNode();
    int responseCode = Response.Status.BAD_REQUEST.getStatusCode();

    if (body.equalsIgnoreCase("{}")) {

      Boolean success = true;

      response.put("success", success);
      responseCode = Response.Status.OK.getStatusCode();

      return Response.status(responseCode).entity(response).build();
    }

    try {

      GenericWebhookData objectWrapper = mapper.readValue(body, GenericWebhookData.class);

      for ( ObjectNode item : objectWrapper.getData()) {

        StreamsDatum datum = new StreamsDatum(item);

        lock.writeLock().lock();
        ComponentUtils.offerUntilSuccess(datum, providerQueue);
        lock.writeLock().unlock();
      }

      Boolean success = true;

      response.put("success", success);
      responseCode = Response.Status.OK.getStatusCode();

    } catch (Exception ex) {
      log.warn(ex.toString(), ex);

      Boolean success = false;

      response.put("success", success);
      responseCode = Response.Status.BAD_REQUEST.getStatusCode();
    } finally {
      return Response.status(responseCode).entity(response).build();
    }

  }

  @Override
  public void startStream() {
  }

  @Override
  public StreamsResultSet readCurrent() {

    StreamsResultSet current;

    lock.writeLock().lock();
    current = new StreamsResultSet(new ConcurrentLinkedQueue<>(providerQueue));
    providerQueue.clear();
    lock.writeLock().unlock();

    return current;

  }

  @Override
  public StreamsResultSet readNew(BigInteger sequence) {
    return null;
  }

  @Override
  public StreamsResultSet readRange(DateTime start, DateTime end) {
    return null;
  }

  @Override
  public boolean isRunning() {
    return true;
  }

  @Override
  public void prepare(Object configurationObject) {

  }

  @Override
  public void cleanUp() {

  }

}