/**
* 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.utils;
import backtype.storm.Config;
import backtype.storm.multilang.ISerializer;
import backtype.storm.multilang.BoltMsg;
import backtype.storm.multilang.NoOutputException;
import backtype.storm.multilang.ShellMsg;
import backtype.storm.multilang.SpoutMsg;
import backtype.storm.task.TopologyContext;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.Serializable;
import java.util.List;
import java.util.Map;
import org.apache.commons.io.IOUtils;
import org.apache.log4j.Logger;
public class ShellProcess implements Serializable {
public static Logger LOG = Logger.getLogger(ShellProcess.class);
public static Logger ShellLogger;
private Process _subprocess;
private InputStream processErrorStream;
private String[] command;
public ISerializer serializer;
public Number pid;
public String componentName;
public ShellProcess(String[] command) {
this.command = command;
}
public Number launch(Map conf, TopologyContext context) {
ProcessBuilder builder = new ProcessBuilder(command);
builder.directory(new File(context.getCodeDir()));
ShellLogger = Logger.getLogger(context.getThisComponentId());
this.componentName = context.getThisComponentId();
this.serializer = getSerializer(conf);
try {
_subprocess = builder.start();
processErrorStream = _subprocess.getErrorStream();
serializer.initialize(_subprocess.getOutputStream(), _subprocess.getInputStream());
this.pid = serializer.connect(conf, context);
} catch (IOException e) {
throw new RuntimeException(
"Error when launching multilang subprocess\n"
+ getErrorsString(), e);
} catch (NoOutputException e) {
throw new RuntimeException(e + getErrorsString() + "\n");
}
return this.pid;
}
private ISerializer getSerializer(Map conf) {
//get factory class name
String serializer_className = (String)conf.get(Config.TOPOLOGY_MULTILANG_SERIALIZER);
LOG.info("Storm multilang serializer: " + serializer_className);
ISerializer serializer = null;
try {
//create a factory class
Class klass = Class.forName(serializer_className);
//obtain a serializer object
Object obj = klass.newInstance();
serializer = (ISerializer)obj;
} catch(Exception e) {
throw new RuntimeException("Failed to construct multilang serializer from serializer " + serializer_className, e);
}
return serializer;
}
public void destroy() {
_subprocess.destroy();
}
public ShellMsg readShellMsg() throws IOException {
try {
return serializer.readShellMsg();
} catch (NoOutputException e) {
throw new RuntimeException(e + getErrorsString() + "\n");
}
}
public void writeBoltMsg(BoltMsg msg) throws IOException {
serializer.writeBoltMsg(msg);
// Log any info sent on the error stream
logErrorStream();
}
public void writeSpoutMsg(SpoutMsg msg) throws IOException {
serializer.writeSpoutMsg(msg);
// Log any info sent on the error stream
logErrorStream();
}
public void writeTaskIds(List<Integer> taskIds) throws IOException {
serializer.writeTaskIds(taskIds);
// Log any info sent on the error stream
logErrorStream();
}
public void logErrorStream() {
try {
while (processErrorStream.available() > 0) {
int bufferSize = processErrorStream.available();
byte[] errorReadingBuffer = new byte[bufferSize];
processErrorStream.read(errorReadingBuffer, 0, bufferSize);
ShellLogger.info(new String(errorReadingBuffer));
}
} catch (Exception e) {
}
}
public String getErrorsString() {
if (processErrorStream != null) {
try {
return IOUtils.toString(processErrorStream);
} catch (IOException e) {
return "(Unable to capture error stream)";
}
} else {
return "";
}
}
/**
*
* @return pid, if the process has been launched, null otherwise.
*/
public Number getPid() {
return this.pid;
}
/**
*
* @return the name of component.
*/
public String getComponentName() {
return this.componentName;
}
/**
*
* @return exit code of the process if process is terminated, -1 if process is not started or terminated.
*/
public int getExitCode() {
try {
return this._subprocess != null ? this._subprocess.exitValue() : -1;
} catch(IllegalThreadStateException e) {
return -1;
}
}
public String getProcessInfoString() {
return String.format("pid:%s, name:%s", pid, componentName);
}
public String getProcessTerminationInfoString() {
return String.format(" exitCode:%s, errorString:%s ", getExitCode(), getErrorsString());
}
}