/**
* 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.
*/
package com.seyren.core.service.live.server;
import static org.python.google.common.collect.ImmutableSet.*;
import java.io.IOException;
import java.io.InputStream;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.net.Socket;
import java.util.Date;
import java.util.List;
import java.util.concurrent.Executor;
import org.python.core.PyList;
import org.python.core.PyString;
import org.python.core.PyTuple;
import org.python.modules.cPickle;
import org.python.modules.struct;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.google.common.base.Function;
import com.google.common.collect.Lists;
import com.seyren.core.service.live.Metric;
import com.seyren.core.service.live.MetricsTask;
import com.seyren.core.service.schedule.CheckRunnerFactory;
import com.seyren.core.store.ChecksStore;
/**
* See http://graphite.readthedocs.org/en/latest/feeding-carbon.html
*/
public class PickleHandler implements Runnable {
private static final Logger LOGGER = LoggerFactory.getLogger(PickleHandler.class);
private static final String ISO_8859_1 = "ISO-8859-1";
private Socket socket;
private Executor executor;
private ChecksStore checksStore;
private CheckRunnerFactory checkRunnerFactory;
public PickleHandler(Socket socket, Executor executor, ChecksStore checksStore, CheckRunnerFactory checkRunnerFactory) {
this.socket = socket;
this.executor = executor;
this.executor = executor;
this.checksStore = checksStore;
this.checkRunnerFactory = checkRunnerFactory;
}
@Override
public void run() {
LOGGER.debug("Accepted.");
InputStream inputStream = null;
try {
inputStream = socket.getInputStream();
while (true) {
// http://graphite.readthedocs.org/en/latest/feeding-carbon.html
// Send the data over a socket to Carbon’s pickle receiver
// You’ll need to pack your pickled data into a packet containing a simple header:
// payload = pickle.dumps(listOfMetricTuples)
// header = struct.pack("!L", len(payload))
// message = header + payload
// Here, we have to decode this kind of message
BigInteger length = getLength(inputStream);
LOGGER.debug("Pickle length {}", length);
List<Metric> metrics = getMetrics(inputStream, length);
LOGGER.debug("Pickle size: {}", metrics.size());
executor.execute(new MetricsTask(copyOf(metrics), checksStore, checkRunnerFactory));
}
} catch (Exception e) {
LOGGER.warn("An error occurs when decoding pickle message: '{}' (change log level to debug to see stack trace).", e.getMessage());
LOGGER.debug("An error occurs when decoding pickle message: ", e);
} finally {
if (inputStream != null) {
try {
inputStream.close();
} catch (IOException e) {
}
}
}
}
private BigInteger getLength(InputStream inputStream) throws IOException {
byte[] bytes = new byte[4];
inputStream.read(bytes);
String stHeader = new String(bytes, ISO_8859_1);
PyTuple tuple = struct.unpack("!L", stHeader);
return (BigInteger) tuple.get(0);
}
@SuppressWarnings("unchecked")
private List<Metric> getMetrics(InputStream inputStream, BigInteger length) throws IOException {
byte[] bytes = new byte[length.intValue()];
inputStream.read(bytes);
String payload = new String(bytes, ISO_8859_1);
PyString pyString = new PyString(payload);
PyList pyList = (PyList) cPickle.loads(pyString);
return Lists.transform(pyList, new PythonToJava());
}
private static class PythonToJava implements Function<Object, Metric> {
@Override
public Metric apply(Object pyObject) {
PyTuple pyTuple = (PyTuple) pyObject;
Metric metric = new Metric();
metric.setName(pyTuple.get(0).toString());
PyTuple data = ((PyTuple) pyTuple.get(1));
metric.setTimestamp(new Date(((Number) data.get(0)).longValue() * 1000));
metric.setValue(new BigDecimal(((Number) data.get(1)).doubleValue()));
return metric;
}
}
}