package com.linkedin.databus2.core.container.request;
/*
*
* Copyright 2013 LinkedIn Corp. All rights reserved
*
* Licensed 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.
*
*/
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.charset.Charset;
import java.util.Formatter;
import java.util.concurrent.ExecutorService;
import org.jboss.netty.handler.codec.http.HttpResponseStatus;
import com.linkedin.databus2.core.container.request.DatabusRequest;
import com.linkedin.databus2.core.container.request.RequestProcessingException;
import com.linkedin.databus2.core.container.request.RequestProcessor;
import com.linkedin.databus.core.DatabusComponentStatus;
/** Implements simple container health-check REST interface */
public class ContainerAdminRequestProcessor implements RequestProcessor
{
private final ExecutorService _executorService;
private final DatabusComponentStatus _status;
private final String _normalizedPath;
private final String _statusPath;
public ContainerAdminRequestProcessor(ExecutorService executorService,
DatabusComponentStatus status,
String healthcheckPath)
{
_executorService = executorService;
int slashIdx = healthcheckPath.indexOf('/');
_normalizedPath = -1 == slashIdx ? "" :
normalizePath(healthcheckPath.substring(slashIdx));
_statusPath = 0 == _normalizedPath.length() ? "status" : _normalizedPath + "/status";
_status = status;
}
@Override
public DatabusRequest process(DatabusRequest request) throws IOException,
RequestProcessingException
{
String path = request.getParams().getProperty(DatabusRequest.PATH_PARAM_NAME);
String normPath = normalizePath(path);
if (null == normPath)
{
if (0 == _normalizedPath.length()) returnPlainStatus(request);
else throw new RequestProcessingException("expected admin sub-command");
}
else if (_normalizedPath.equals(normPath)) returnPlainStatus(request);
else if (_statusPath.equals(normPath)) returnComponentStatus(request);
else throw new RequestProcessingException("unknown admin sub-command:" + normPath);
return null;
}
public static String extractCommandRoot(String path)
{
int slashIndex = path.indexOf('/');
return -1 == slashIndex ? path : path.substring(0, slashIndex);
}
private static String normalizePath(String path)
{
if (null == path) return null;
int startIdx = 0;
for (; startIdx < path.length() && path.charAt(startIdx) == '/'; ++startIdx);
int endIdx = path.length() - 1;
for (; endIdx >=0 && path.charAt(endIdx) == '/'; --endIdx);
return path.substring(startIdx, endIdx + 1);
}
private void returnComponentStatus(DatabusRequest request) throws IOException
{
Formatter fmt = new Formatter();
fmt.format("{\"status\":\"%s\",\"message\":\"%s\"}\n", _status.getStatus().toString(),
_status.getMessage());
fmt.flush();
request.getResponseContent().write(ByteBuffer.wrap(fmt.toString().getBytes(Charset.defaultCharset())));
}
@Override
public ExecutorService getExecutorService()
{
return _executorService;
}
private void returnPlainStatus(DatabusRequest request) throws IOException
{
String statusString;
HttpResponseStatus statusCode;
if (null != _status && _status.getStatus() != DatabusComponentStatus.Status.RUNNING)
{
statusString = "BAD\n";
statusCode = HttpResponseStatus.SERVICE_UNAVAILABLE;
}
else
{
statusString = "GOOD\n";
statusCode = HttpResponseStatus.OK;
}
request.getResponseContent().setResponseCode(statusCode);
request.getResponseContent().write(ByteBuffer.wrap(statusString.getBytes(Charset.defaultCharset())));
}
}