/*
* 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.hadoop.chukwa.datacollection.adaptor;
import org.apache.hadoop.chukwa.ChunkImpl;
import org.apache.hadoop.chukwa.datacollection.ChunkReceiver;
import org.apache.hadoop.chukwa.inputtools.plugin.ExecPlugin;
import org.apache.log4j.Logger;
import org.apache.log4j.helpers.ISO8601DateFormat;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.*;
/**
* Runs a command inside chukwa. Takes as params the interval in seconds at
* which to run the command, and the path and args to execute.
*
* Interval is optional, and defaults to 5 seconds.
*
* Example usage: add
* org.apache.hadoop.chukwa.datacollection.adaptor.ExecAdaptor Ps 2 /bin/ps aux
* 0
*
*/
public class ExecAdaptor extends AbstractAdaptor {
static class EmbeddedExec extends ExecPlugin {
String cmd;
public EmbeddedExec(String c) {
cmd = c;
}
@Override
public String getCmde() {
return cmd;
}
}
EmbeddedExec exec;
static final boolean FAKE_LOG4J_HEADER = true;
static final boolean SPLIT_LINES = false;
static Logger log = Logger.getLogger(ExecAdaptor.class);
class RunToolTask extends TimerTask {
public void run() {
log.info("calling exec");
JSONObject o = exec.execute();
try {
if (o.getInt("status") == exec.statusKO)
deregisterAndStop(false);
// FIXME: downstream customers would like timestamps here.
// Doing that efficiently probably means cutting out all the
// excess buffer copies here, and appending into an OutputBuffer.
byte[] data;
if (FAKE_LOG4J_HEADER) {
StringBuilder result = new StringBuilder();
ISO8601DateFormat dateFormat = new org.apache.log4j.helpers.ISO8601DateFormat();
result.append(dateFormat.format(new java.util.Date()));
result.append(" INFO org.apache.hadoop.chukwa.");
result.append(type);
result.append("= ");
result.append(o.getString("exitValue"));
result.append(": ");
result.append(o.getString("stdout"));
data = result.toString().getBytes();
} else {
String stdout = o.getString("stdout");
data = stdout.getBytes();
}
sendOffset += data.length;
ChunkImpl c = new ChunkImpl(ExecAdaptor.this.type, "results from "
+ cmd, sendOffset, data, ExecAdaptor.this);
if (SPLIT_LINES) {
ArrayList<Integer> carriageReturns = new ArrayList<Integer>();
for (int i = 0; i < data.length; ++i)
if (data[i] == '\n')
carriageReturns.add(i);
c.setRecordOffsets(carriageReturns);
} // else we get default one record
//We can't replay exec data, so we might as well commit to it now.
control.reportCommit(ExecAdaptor.this, sendOffset);
dest.add(c);
} catch (JSONException e) {
log.warn(e);
} catch (InterruptedException e) {
;
}
}
};
String cmd;
final java.util.Timer timer;
long period = 5 * 1000;
volatile long sendOffset = 0;
public ExecAdaptor() {
timer = new java.util.Timer();
}
@Override
public String getCurrentStatus() {
return type + " " + period + " " + cmd;
}
@Override
@Deprecated
/**
* use shutdown(AdaptorShutdownPolicy shutdownPolicy)
*/
public void hardStop() throws AdaptorException {
shutdown(AdaptorShutdownPolicy.HARD_STOP);
}
@Override
@Deprecated
/**
* use shutdown(AdaptorShutdownPolicy shutdownPolicy)
*/
public long shutdown() throws AdaptorException {
return shutdown(AdaptorShutdownPolicy.GRACEFULLY);
}
@Override
public long shutdown(AdaptorShutdownPolicy shutdownPolicy)
throws AdaptorException {
log.info("Enter Shutdown:" + shutdownPolicy.name()+ " - ObjectId:" + this);
switch(shutdownPolicy) {
case HARD_STOP :
timer.cancel();
exec.stop();
break;
case GRACEFULLY :
case WAIT_TILL_FINISHED :
try {
timer.cancel();
exec.waitFor();
} catch (InterruptedException e) {
}
break;
}
log.info("Exist Shutdown:" + shutdownPolicy.name()+ " - ObjectId:" + this);
return sendOffset;
}
@Override
public void start(long offset) throws AdaptorException {
this.sendOffset = offset;
this.exec = new EmbeddedExec(cmd);
TimerTask execTimer = new RunToolTask();
timer.schedule(execTimer, 0L, period);
}
@Override
public String parseArgs(String status) {
int spOffset = status.indexOf(' ');
if (spOffset > 0) {
try {
period = Integer.parseInt(status.substring(0, spOffset));
cmd = status.substring(spOffset + 1);
} catch (NumberFormatException e) {
log.warn("ExecAdaptor: sample interval "
+ status.substring(0, spOffset) + " can't be parsed");
cmd = status;
}
} else
cmd = status;
return cmd;
}
}