org.evosuite.utils.ExternalProcessHandler Maven / Gradle / Ivy
/**
* Copyright (C) 2010-2017 Gordon Fraser, Andrea Arcuri and EvoSuite
* contributors
*
* This file is part of EvoSuite.
*
* EvoSuite is free software: you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation, either version 3.0 of the License, or
* (at your option) any later version.
*
* EvoSuite is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with EvoSuite. If not, see logger */
protected static final Logger logger = LoggerFactory.getLogger(ExternalProcessHandler.class);
protected ServerSocket server;
protected Process process;
protected String[] last_command;
protected Thread output_printer;
protected Thread error_printer;
protected Thread message_handler;
protected Socket connection;
protected ObjectOutputStream out;
protected ObjectInputStream in;
protected Object final_result;
/** Constant WAITING_FOR_DATA */
protected static final Object WAITING_FOR_DATA = "waiting_for_data_"
+ System.currentTimeMillis();
protected Thread processKillHook;
protected Thread clientRunningOnThread;
protected volatile CountDownLatch latch;
protected String base_dir = System.getProperty("user.dir");
private String hsErrFile;
/**
*
* Constructor for ExternalProcessHandler.
*
*/
public ExternalProcessHandler() {
}
/**
* Only for debug reasons.
* @param ms
*/
public void stopAndWaitForClientOnThread(long ms){
if(clientRunningOnThread != null && clientRunningOnThread.isAlive()){
clientRunningOnThread.interrupt();
}
long start = System.currentTimeMillis();
while( (System.currentTimeMillis() - start) < ms) { //to avoid miss it in case of interrupt
if(clientRunningOnThread != null && clientRunningOnThread.isAlive()){
try {
clientRunningOnThread.join(ms - (System.currentTimeMillis() - start));
break;
} catch (InterruptedException e) {
}
} else {
break;
}
}
if( clientRunningOnThread != null && clientRunningOnThread.isAlive()) {
throw new AssertionError( "clientRunningOnThread is alive even after waiting "+ms+"ms");
}
}
/**
*
* setBaseDir
*
*
* @param base_dir
* a {@link java.lang.String} object.
*/
public void setBaseDir(String base_dir) {
this.base_dir = base_dir;
}
/**
*
* startProcess
*
*
* @param command
* an array of {@link java.lang.String} objects.
* @return a boolean.
*/
public boolean startProcess(String[] command) {
if(! Properties.IS_RUNNING_A_SYSTEM_TEST) {
logger.debug("Going to start process with command: " + Arrays.toString(command).replace(",", " "));
}
List formatted = new LinkedList<>();
for(String s : command){
String token = s.trim();
if(!token.isEmpty()){
formatted.add(token);
}
}
hsErrFile = "hs_err_EvoSuite_client_p"+getServerPort()+"_t"+System.currentTimeMillis();
String option = "-XX:ErrorFile="+hsErrFile;
formatted.add(1,option); // add it after the first "java" command
return startProcess(formatted.toArray(new String[0]), null);
}
protected boolean didClientJVMCrash(){
return new File(hsErrFile).exists();
}
protected String getAndDeleteHsErrFile(){
if(!didClientJVMCrash()){
return null;
}
StringBuffer buffer = new StringBuffer();
File file = new File(hsErrFile);
file.deleteOnExit();
try(Scanner in = new Scanner(file);) {
while(in.hasNextLine()){
String row = in.nextLine();
//do not read the full file, just the header
if(row.startsWith("#")){
buffer.append(row+"\n");
} else {
break; //end of the header
}
}
} catch (FileNotFoundException e) {
//shouldn't really happen
logger.error("Error while reading "+file.getAbsolutePath() + ": "+e.getMessage());
return null;
}
return buffer.toString();
}
public String getProcessState(){
if(process == null){
return "null";
}
try{
return "Terminated with exit status "+process.exitValue();
} catch(IllegalThreadStateException e){
return "Still running";
}
}
/**
*
* startProcess
*
*
* @param command
* an array of {@link java.lang.String} objects.
* @param population_data
* a {@link java.lang.Object} object.
* @return a boolean.
*/
protected boolean startProcess(String[] command, Object population_data) {
if (process != null) {
logger.warn("Already running an external process");
return false;
}
latch = new CountDownLatch(1);
final_result = WAITING_FOR_DATA;
//the following thread is important to make sure that the external process is killed
//when current process ends
processKillHook = new Thread() {
@Override
public void run() {
killProcess();
closeServer();
}
};
Runtime.getRuntime().addShutdownHook(processKillHook);
// now start the process
if (!Properties.CLIENT_ON_THREAD) {
File dir = new File(base_dir);
ProcessBuilder builder = new ProcessBuilder(command);
builder.directory(dir);
builder.redirectErrorStream(false);
try {
process = builder.start();
} catch (IOException e) {
logger.error("Failed to start external process", e);
return false;
}
//FIXME: shouldn't it be deprecated???
startExternalProcessPrinter();
} else {
/*
* Here we run client on a thread instead of process.
* NOTE: this should only be done for debugging, ie in
* JUnit files created for testing EvoSuite.
*/
clientRunningOnThread = new Thread() {
@Override
public void run() {
/*
* NOTE: the handling of the parameters "-D" should be handled
* directly in JUnit by setting the different values in Properties
*/
ClientProcess.main(new String[0]);
}
};
clientRunningOnThread.setName("client");
clientRunningOnThread.start();
Sandbox.addPrivilegedThread(clientRunningOnThread);
}
startSignalHandler();
last_command = command;
return true;
}
/**
*
* killProcess
*
*/
public void killProcess() {
try {
Runtime.getRuntime().removeShutdownHook(processKillHook);
} catch (Exception e) { /* do nothing. this can happen if shutdown is in progress */
}
/*
* TODO: use RMI to 'gracefully' stop the client
*/
if (process != null) {
try {
//be sure streamers are closed, otherwise process might hang on Windows
process.getOutputStream().close();
process.getInputStream().close();
process.getErrorStream().close();
} catch (Exception t){
logger.error("Failed to close process stream: "+t.toString());
}
process.destroy();
}
process = null;
if (clientRunningOnThread != null && clientRunningOnThread.isAlive()) {
clientRunningOnThread.interrupt();
}
clientRunningOnThread = null;
if (output_printer != null && output_printer.isAlive())
output_printer.interrupt();
output_printer = null;
if (error_printer != null && error_printer.isAlive())
error_printer.interrupt();
error_printer = null;
if (message_handler != null && message_handler.isAlive()) {
message_handler.interrupt();
}
message_handler = null;
}
/**
*
* getServerPort
*
*
* @return a int.
*/
public int getServerPort() {
return MasterServices.getInstance().getRegistryPort();
}
/**
*
* openServer
*
*
* @return a int.
*/
public int openServer() {
boolean started = MasterServices.getInstance().startRegistry();
if(!started){
logger.error("Not possible to start RMI registry");
return -1;
}
try {
MasterServices.getInstance().registerServices();
} catch (RemoteException e) {
logger.error("Failed to start RMI services",e);
return -1;
}
return MasterServices.getInstance().getRegistryPort();
/*
if (server == null) {
try {
server = new ServerSocket();
server.setSoTimeout(10000);
server.bind(null);
return server.getLocalPort();
} catch (Exception e) {
logger.error("Not possible to start TCP server", e);
}
}
return -1;
*/
}
/**
*
* closeServer
*
*/
public void closeServer() {
MasterServices.getInstance().stopServices();
}
/**
*
* startExternalProcessPrinter
*
*/
protected void startExternalProcessPrinter() {
if (output_printer == null || !output_printer.isAlive()) {
output_printer = new Thread() {
@Override
public void run() {
try {
BufferedReader proc_in = new BufferedReader(
new InputStreamReader(process.getInputStream()));
int data = 0;
while (data != -1 && !isInterrupted()) {
data = proc_in.read();
if (data != -1 && Properties.PRINT_TO_SYSTEM) {
System.out.print((char) data);
}
}
} catch (Exception e) {
if(MasterServices.getInstance().getMasterNode() == null)
return;
boolean finished = true;
for(ClientState state : MasterServices.getInstance().getMasterNode().getCurrentState()) {
if(state != ClientState.DONE) {
finished = false;
break;
}
}
if(!finished)
logger.error("Exception while reading output of client process. "
+ e.getMessage());
else
logger.debug("Exception while reading output of client process. "
+ e.getMessage());
}
}
};
output_printer.start();
}
if (error_printer == null || !error_printer.isAlive()) {
error_printer = new Thread() {
@Override
public void run() {
try {
BufferedReader proc_in = new BufferedReader(
new InputStreamReader(process.getErrorStream()));
int data = 0;
String errorLine ="";
while (data != -1 && !isInterrupted()) {
data = proc_in.read();
if (data != -1 && Properties.PRINT_TO_SYSTEM) {
System.err.print((char) data);
errorLine += (char) data;
if((char)data == '\n'){
logger.error(errorLine);
errorLine = "";
}
}
}
} catch (Exception e) {
if(MasterServices.getInstance().getMasterNode() == null)
return;
boolean finished = true;
for(ClientState state : MasterServices.getInstance().getMasterNode().getCurrentState()) {
if(state != ClientState.DONE) {
finished = false;
break;
}
}
if(!finished)
logger.error("Exception while reading output of client process. "
+ e.getMessage());
else
logger.debug("Exception while reading output of client process. "
+ e.getMessage());
}
}
};
error_printer.start();
}
if (Properties.SHOW_PROGRESS &&
(Properties.LOG_LEVEL==null ||
(!Properties.LOG_LEVEL.equals("info")
&& !Properties.LOG_LEVEL.equals("debug")
&& !Properties.LOG_LEVEL.equals("trace"))
)
) {
ConsoleProgressBar.startProgressBar();
}
}
/**
*
* startExternalProcessMessageHandler
*
*/
protected void startExternalProcessMessageHandler() {
if (message_handler != null && message_handler.isAlive())
return;
message_handler = new Thread() {
@Override
public void run() {
boolean read = true;
while (read && !isInterrupted()) {
String message = null;
Object data = null;
try {
message = (String) in.readObject();
data = in.readObject();
logger.debug("Received msg: " + message);
logger.debug("Received data: " + data);
} catch (Exception e) {
/*
* TODO: this parts need to be improved.
* An exception here is most likely due to the client crashing.
* If there is still enough budget (this might not be trivial to check,
* eg it could be fine for time, but not number of fitness evaluations), then
* we should try to re-start based on the partial info received so far, eg
* the best solutions found so far which was sent to master
*/
logger.error("Class "
+ Properties.TARGET_CLASS
+ ". Error when reading message. Likely the client has crashed. Error message: "
+ e.getMessage());
message = Messages.FINISHED_COMPUTATION;
data = null;
}
if (message.equals(Messages.FINISHED_COMPUTATION)) {
LoggingUtils.getEvoLogger().info("* Computation finished");
read = false;
killProcess();
final_result = data;
latch.countDown();
} else if (message.equals(Messages.NEED_RESTART)) {
//now data represent the current generation
LoggingUtils.getEvoLogger().info("* Restarting client process");
killProcess();
/*
* TODO: this will need to be changed, to take into account
* a possible reduced budget
*/
startProcess(last_command, data);
} else {
killProcess();
logger.error("Class " + Properties.TARGET_CLASS
+ ". Error, received invalid message: ", message);
return;
}
}
}
};
message_handler.start();
}
/**
*
* startSignalHandler
*
*/
protected void startSignalHandler() {
Signal.handle(new Signal("INT"), new SignalHandler() {
private boolean interrupted = false;
@Override
public void handle(Signal arg0) {
if (interrupted)
System.exit(0);
try {
interrupted = true;
if (process != null)
process.waitFor();
} catch (InterruptedException e) {
logger.warn("",e);
}
}
});
}
/**
*
* waitForResult
*
*
* @param timeout
* a int.
* @return a {@link java.lang.Object} object.
*/
public TestGenerationResult waitForResult(int timeout) {
try {
long start = System.currentTimeMillis();
Set clients = MasterServices.getInstance().getMasterNode().getClientsOnceAllConnected(timeout);
if(clients==null){
logger.error("Could not access client process");
return TestGenerationResultBuilder.buildErrorResult("Could not access client process");
}
for(ClientNodeRemote client : clients){
long passed = System.currentTimeMillis() - start;
long remaining = timeout - passed;
if(remaining <=0 ){ remaining = 1;}
boolean finished = client.waitUntilFinished(remaining);
if(!finished){
/*
* TODO what to do here? Try to stop the the client through RMI?
* Or check in which state it is, and based on that decide if giving more time?
*/
logger.error("Class "+ Properties.TARGET_CLASS+". Clients have not finished yet, although a timeout occurred.\n"+MasterServices.getInstance().getMasterNode().getSummaryOfClientStatuses());
}
}
} catch (InterruptedException e) {
} catch(RemoteException e){
String msg = "Class "+ Properties.TARGET_CLASS+". Lost connection with clients.\n"+MasterServices.getInstance().getMasterNode().getSummaryOfClientStatuses();
if(didClientJVMCrash()){
String err = getAndDeleteHsErrFile();
msg += "The JVM of the client process crashed:\n"+err;
logger.error(msg);
} else {
logger.error(msg, e);
}
}
killProcess();
LoggingUtils.getEvoLogger().info("* Computation finished");
return null; //TODO refactoring
/*
try {
latch.await(timeout, TimeUnit.MILLISECONDS);
} catch (InterruptedException e) {
logger.warn("Class "
+ Properties.TARGET_CLASS
+ ". Thread interrupted while waiting for results from client process",
e);
}
return final_result;
*/
}
}