org.apache.flume.source.http.BLOBHandler Maven / Gradle / Ivy
/*
* 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.flume.source.http;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import org.apache.commons.io.IOUtils;
import org.apache.commons.io.output.ByteArrayOutputStream;
import org.apache.flume.Context;
import org.apache.flume.Event;
import org.apache.flume.conf.LogPrivacyUtil;
import org.apache.flume.event.EventBuilder;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.google.common.base.Preconditions;
/**
*
* BLOBHandler for HTTPSource that accepts any binary stream of data as event.
*
*/
public class BLOBHandler implements HTTPSourceHandler {
private static final Logger LOG = LoggerFactory.getLogger(BLOBHandler.class);
private String commaSeparatedHeaders;
private String[] mandatoryHeaders;
public static final String MANDATORY_PARAMETERS = "mandatoryParameters";
public static final String DEFAULT_MANDATORY_PARAMETERS = "";
public static final String PARAMETER_SEPARATOR = ",";
/**
* {@inheritDoc}
*/
@SuppressWarnings("unchecked")
@Override
public List getEvents(HttpServletRequest request) throws Exception {
Map headers = new HashMap();
InputStream inputStream = request.getInputStream();
Map parameters = request.getParameterMap();
for (String parameter : parameters.keySet()) {
String value = parameters.get(parameter)[0];
if (LOG.isDebugEnabled() && LogPrivacyUtil.allowLogRawData()) {
LOG.debug("Setting Header [Key, Value] as [{},{}] ", parameter, value);
}
headers.put(parameter, value);
}
for (String header : mandatoryHeaders) {
Preconditions.checkArgument(headers.containsKey(header),
"Please specify " + header + " parameter in the request.");
}
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
try {
IOUtils.copy(inputStream, outputStream);
LOG.debug("Building an Event with stream of size -- {}", outputStream.size());
Event event = EventBuilder.withBody(outputStream.toByteArray(), headers);
event.setHeaders(headers);
List eventList = new ArrayList();
eventList.add(event);
return eventList;
} finally {
outputStream.close();
inputStream.close();
}
}
@Override
public void configure(Context context) {
this.commaSeparatedHeaders = context.getString(MANDATORY_PARAMETERS,
DEFAULT_MANDATORY_PARAMETERS);
this.mandatoryHeaders = commaSeparatedHeaders.split(PARAMETER_SEPARATOR);
}
}