/**
* 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 backtype.storm.spout;
import backtype.storm.generated.ShellComponent;
import backtype.storm.metric.api.IMetric;
import backtype.storm.metric.api.rpc.IShellMetric;
import backtype.storm.multilang.ShellMsg;
import backtype.storm.multilang.SpoutMsg;
import backtype.storm.task.TopologyContext;
import backtype.storm.utils.ShellProcess;
import java.util.Map;
import java.util.List;
import java.io.IOException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class ShellSpout implements ISpout {
public static Logger LOG = LoggerFactory.getLogger(ShellSpout.class);
private SpoutOutputCollector _collector;
private String[] _command;
private ShellProcess _process;
private TopologyContext _context;
private SpoutMsg _spoutMsg;
public ShellSpout(ShellComponent component) {
this(component.get_execution_command(), component.get_script());
}
public ShellSpout(String... command) {
_command = command;
}
public void open(Map stormConf, TopologyContext context,
SpoutOutputCollector collector) {
_collector = collector;
_context = context;
_process = new ShellProcess(_command);
Number subpid = _process.launch(stormConf, context);
LOG.info("Launched subprocess with pid " + subpid);
}
public void close() {
_process.destroy();
}
public void nextTuple() {
if (_spoutMsg == null) {
_spoutMsg = new SpoutMsg();
}
_spoutMsg.setCommand("next");
_spoutMsg.setId("");
querySubprocess();
}
public void ack(Object msgId) {
if (_spoutMsg == null) {
_spoutMsg = new SpoutMsg();
}
_spoutMsg.setCommand("ack");
_spoutMsg.setId(msgId);
querySubprocess();
}
public void fail(Object msgId) {
if (_spoutMsg == null) {
_spoutMsg = new SpoutMsg();
}
_spoutMsg.setCommand("fail");
_spoutMsg.setId(msgId);
querySubprocess();
}
private void handleMetrics(ShellMsg shellMsg) {
//get metric name
String name = shellMsg.getMetricName();
if (name.isEmpty()) {
throw new RuntimeException("Receive Metrics name is empty");
}
//get metric by name
IMetric iMetric = _context.getRegisteredMetricByName(name);
if (iMetric == null) {
throw new RuntimeException("Could not find metric by name["+name+"] ");
}
if ( !(iMetric instanceof IShellMetric)) {
throw new RuntimeException("Metric["+name+"] is not IShellMetric, can not call by RPC");
}
IShellMetric iShellMetric = (IShellMetric)iMetric;
//call updateMetricFromRPC with params
Object paramsObj = shellMsg.getMetricParams();
try {
iShellMetric.updateMetricFromRPC(paramsObj);
} catch (RuntimeException re) {
throw re;
} catch (Exception e) {
throw new RuntimeException(e);
}
}
private void querySubprocess() {
try {
_process.writeSpoutMsg(_spoutMsg);
while (true) {
ShellMsg shellMsg = _process.readShellMsg();
String command = shellMsg.getCommand();
if (command == null) {
throw new IllegalArgumentException("Command not found in spout message: " + shellMsg);
}
if (command.equals("sync")) {
return;
} else if (command.equals("log")) {
handleLog(shellMsg);
} else if (command.equals("emit")) {
String stream = shellMsg.getStream();
Long task = shellMsg.getTask();
List<Object> tuple = shellMsg.getTuple();
Object messageId = shellMsg.getId();
if (task == 0) {
List<Integer> outtasks = _collector.emit(stream, tuple, messageId);
if (shellMsg.areTaskIdsNeeded()) {
_process.writeTaskIds(outtasks);
}
} else {
_collector.emitDirect((int) task.longValue(), stream, tuple, messageId);
}
} else if (command.equals("metrics")) {
handleMetrics(shellMsg);
} else {
throw new RuntimeException("Unknown command received: " + command);
}
}
} catch (Exception e) {
String processInfo = _process.getProcessInfoString() + _process.getProcessTerminationInfoString();
throw new RuntimeException(processInfo, e);
}
}
private void handleLog(ShellMsg shellMsg) {
String msg = shellMsg.getMsg();
msg = "ShellLog " + _process.getProcessInfoString() + " " + msg;
ShellMsg.ShellLogLevel logLevel = shellMsg.getLogLevel();
switch (logLevel) {
case TRACE:
LOG.trace(msg);
break;
case DEBUG:
LOG.debug(msg);
break;
case INFO:
LOG.info(msg);
break;
case WARN:
LOG.warn(msg);
break;
case ERROR:
LOG.error(msg);
break;
default:
LOG.info(msg);
break;
}
}
@Override
public void activate() {
}
@Override
public void deactivate() {
}
}