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Groovy: A powerful, dynamic language for the JVM
/*
* 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 groovy.lang;
import groovy.security.GroovyCodeSourcePermission;
import groovy.ui.GroovyMain;
import org.apache.groovy.plugin.GroovyRunner;
import org.apache.groovy.plugin.GroovyRunnerRegistry;
import org.codehaus.groovy.control.CompilationFailedException;
import org.codehaus.groovy.control.CompilerConfiguration;
import org.codehaus.groovy.runtime.InvokerHelper;
import org.codehaus.groovy.runtime.InvokerInvocationException;
import java.io.File;
import java.io.IOException;
import java.io.Reader;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.net.URI;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.security.PrivilegedActionException;
import java.security.PrivilegedExceptionAction;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;
import static org.codehaus.groovy.runtime.InvokerHelper.MAIN_METHOD_NAME;
/**
* Represents a groovy shell capable of running arbitrary groovy scripts
*/
public class GroovyShell extends GroovyObjectSupport {
public static final String DEFAULT_CODE_BASE = "/groovy/shell";
private static final String[] EMPTY_STRING_ARRAY = new String[0];
private final Binding context;
private final AtomicInteger counter = new AtomicInteger(0);
private final CompilerConfiguration config;
private final GroovyClassLoader loader;
public static void main(String[] args) {
GroovyMain.main(args);
}
public GroovyShell() {
this(null, new Binding());
}
public GroovyShell(Binding binding) {
this(null, binding);
}
public GroovyShell(ClassLoader parent, CompilerConfiguration config) {
this(parent, new Binding(), config);
}
public GroovyShell(CompilerConfiguration config) {
this(new Binding(), config);
}
public GroovyShell(Binding binding, CompilerConfiguration config) {
this(null, binding, config);
}
public GroovyShell(ClassLoader parent, Binding binding) {
this(parent, binding, CompilerConfiguration.DEFAULT);
}
public GroovyShell(ClassLoader parent) {
this(parent, new Binding(), CompilerConfiguration.DEFAULT);
}
public GroovyShell(ClassLoader parent, Binding binding, final CompilerConfiguration config) {
if (binding == null) {
throw new IllegalArgumentException("Binding must not be null.");
}
if (config == null) {
throw new IllegalArgumentException("Compiler configuration must not be null.");
}
final ClassLoader parentLoader = (parent!=null)?parent:GroovyShell.class.getClassLoader();
if (parentLoader instanceof GroovyClassLoader
&& ((GroovyClassLoader) parentLoader).hasCompatibleConfiguration(config)) {
this.loader = (GroovyClassLoader) parentLoader;
} else {
this.loader = AccessController.doPrivileged((PrivilegedAction) () -> new GroovyClassLoader(parentLoader,config));
}
this.context = binding;
this.config = config;
}
public void resetLoadedClasses() {
loader.clearCache();
}
/**
* Creates a child shell using a new ClassLoader which uses the parent shell's
* class loader as its parent
*
* @param shell is the parent shell used for the variable bindings and the parent class loader
*/
public GroovyShell(GroovyShell shell) {
this(shell.loader, shell.context);
}
public Binding getContext() {
return context;
}
public GroovyClassLoader getClassLoader() {
return loader;
}
public Object getProperty(String property) {
Object answer = getVariable(property);
if (answer == null) {
answer = super.getProperty(property);
}
return answer;
}
public void setProperty(String property, Object newValue) {
setVariable(property, newValue);
try {
super.setProperty(property, newValue);
} catch (GroovyRuntimeException e) {
// ignore, was probably a dynamic property
}
}
/**
* A helper method which runs the given script file with the given command line arguments
*
* @param scriptFile the file of the script to run
* @param list the command line arguments to pass in
*/
public Object run(File scriptFile, List list) throws CompilationFailedException, IOException {
return run(scriptFile, list.toArray(EMPTY_STRING_ARRAY));
}
/**
* A helper method which runs the given cl script with the given command line arguments
*
* @param scriptText is the text content of the script
* @param fileName is the logical file name of the script (which is used to create the class name of the script)
* @param list the command line arguments to pass in
*/
public Object run(String scriptText, String fileName, List list) throws CompilationFailedException {
return run(scriptText, fileName, list.toArray(EMPTY_STRING_ARRAY));
}
/**
* Runs the given script file name with the given command line arguments
*
* @param scriptFile the file name of the script to run
* @param args the command line arguments to pass in
*/
public Object run(final File scriptFile, String[] args) throws CompilationFailedException, IOException {
String scriptName = scriptFile.getName();
int p = scriptName.lastIndexOf('.');
if (p++ >= 0) {
if (scriptName.substring(p).equals("java")) {
throw new CompilationFailedException(0, null);
}
}
// Get the current context classloader and save it on the stack
final Thread thread = Thread.currentThread();
//ClassLoader currentClassLoader = thread.getContextClassLoader();
class DoSetContext implements PrivilegedAction {
final ClassLoader classLoader;
public DoSetContext(ClassLoader loader) {
classLoader = loader;
}
public Object run() {
thread.setContextClassLoader(classLoader);
return null;
}
}
AccessController.doPrivileged(new DoSetContext(loader));
// Parse the script, generate the class, and invoke the main method. This is a little looser than
// if you are compiling the script because the JVM isn't executing the main method.
Class scriptClass;
try {
scriptClass = AccessController.doPrivileged((PrivilegedExceptionAction) () -> loader.parseClass(scriptFile));
} catch (PrivilegedActionException pae) {
Exception e = pae.getException();
if (e instanceof CompilationFailedException) {
throw (CompilationFailedException) e;
} else if (e instanceof IOException) {
throw (IOException) e;
} else {
throw (RuntimeException) pae.getException();
}
}
return runScriptOrMainOrTestOrRunnable(scriptClass, args);
// Set the context classloader back to what it was.
//AccessController.doPrivileged(new DoSetContext(currentClassLoader));
}
/**
* if (theClass is a Script) {
* run it like a script
* } else if (theClass has a main method) {
* run the main method
* } else if (theClass instanceof GroovyTestCase) {
* use the test runner to run it
* } else if (theClass implements Runnable) {
* if (theClass has a constructor with String[] params)
* instantiate theClass with this constructor and run
* else if (theClass has a no-args constructor)
* instantiate theClass with the no-args constructor and run
* }
*/
private Object runScriptOrMainOrTestOrRunnable(Class scriptClass, String[] args) {
// Always set the "args" property, regardless of what path we take in the code.
// Bad enough to have side effects but worse if their behavior is wonky.
context.setProperty("args", args);
if (scriptClass == null) {
return null;
}
//TODO: This logic mostly duplicates InvokerHelper.createScript. They should probably be unified.
if (Script.class.isAssignableFrom(scriptClass)) {
// treat it just like a script if it is one
try {
Script script = InvokerHelper.newScript(scriptClass, context);
return script.run();
} catch (InstantiationException | InvocationTargetException | IllegalAccessException e) {
// ignore instantiation errors,, try to do main
}
}
try {
// let's find a main method
scriptClass.getMethod(MAIN_METHOD_NAME, String[].class);
// if that main method exist, invoke it
return InvokerHelper.invokeMethod(scriptClass, MAIN_METHOD_NAME, new Object[]{args});
} catch (NoSuchMethodException e) {
// if it implements Runnable, try to instantiate it
if (Runnable.class.isAssignableFrom(scriptClass)) {
return runRunnable(scriptClass, args);
}
GroovyRunnerRegistry runnerRegistry = GroovyRunnerRegistry.getInstance();
for (GroovyRunner runner : runnerRegistry) {
if (runner.canRun(scriptClass, this.loader)) {
return runner.run(scriptClass, this.loader);
}
}
StringBuilder message = new StringBuilder("This script or class could not be run.\n" +
"It should either:\n" +
"- have a main method,\n" +
"- be a JUnit test or extend GroovyTestCase,\n" +
"- implement the Runnable interface,\n" +
"- or be compatible with a registered script runner. Known runners:\n");
if (runnerRegistry.isEmpty()) {
message.append(" * ");
} else {
for (String key : runnerRegistry.keySet()) {
message.append(" * ").append(key).append("\n");
}
}
throw new GroovyRuntimeException(message.toString());
}
}
private static Object runRunnable(Class scriptClass, String[] args) {
Constructor constructor = null;
Runnable runnable = null;
Throwable reason = null;
try {
// first, fetch the constructor taking String[] as parameter
constructor = scriptClass.getConstructor(String[].class);
try {
// instantiate a runnable and run it
runnable = (Runnable) constructor.newInstance(new Object[]{args});
} catch (Throwable t) {
reason = t;
}
} catch (NoSuchMethodException e1) {
try {
// otherwise, find the default constructor
constructor = scriptClass.getConstructor();
try {
// instantiate a runnable and run it
runnable = (Runnable) constructor.newInstance();
} catch (InvocationTargetException ite) {
throw new InvokerInvocationException(ite.getTargetException());
} catch (Throwable t) {
reason = t;
}
} catch (NoSuchMethodException nsme) {
reason = nsme;
}
}
if (constructor != null && runnable != null) {
runnable.run();
} else {
throw new GroovyRuntimeException("This script or class was runnable but could not be run. ", reason);
}
return null;
}
/**
* Runs the given script text with command line arguments
*
* @param scriptText is the text content of the script
* @param fileName is the logical file name of the script (which is used to create the class name of the script)
* @param args the command line arguments to pass in
*/
public Object run(final String scriptText, final String fileName, String[] args) throws CompilationFailedException {
GroovyCodeSource gcs = AccessController.doPrivileged((PrivilegedAction) () -> new GroovyCodeSource(scriptText, fileName, DEFAULT_CODE_BASE));
return run(gcs, args);
}
/**
* Runs the given script source with command line arguments
*
* @param source is the source content of the script
* @param args the command line arguments to pass in
*/
public Object run(GroovyCodeSource source, List args) throws CompilationFailedException {
return run(source, args.toArray(EMPTY_STRING_ARRAY));
}
/**
* Runs the given script source with command line arguments
*
* @param source is the source content of the script
* @param args the command line arguments to pass in
*/
public Object run(GroovyCodeSource source, String[] args) throws CompilationFailedException {
Class scriptClass = parseClass(source);
return runScriptOrMainOrTestOrRunnable(scriptClass, args);
}
/**
* Runs the given script source with command line arguments
*
* @param source is the source content of the script
* @param args the command line arguments to pass in
*/
public Object run(URI source, List args) throws CompilationFailedException, IOException {
return run(new GroovyCodeSource(source), args.toArray(EMPTY_STRING_ARRAY));
}
/**
* Runs the given script source with command line arguments
*
* @param source is the source content of the script
* @param args the command line arguments to pass in
*/
public Object run(URI source, String[] args) throws CompilationFailedException, IOException {
return run(new GroovyCodeSource(source), args);
}
/**
* Runs the given script with command line arguments
*
* @param in the stream reading the script
* @param fileName is the logical file name of the script (which is used to create the class name of the script)
* @param list the command line arguments to pass in
*/
public Object run(final Reader in, final String fileName, List list) throws CompilationFailedException {
return run(in, fileName, list.toArray(EMPTY_STRING_ARRAY));
}
/**
* Runs the given script with command line arguments
*
* @param in the stream reading the script
* @param fileName is the logical file name of the script (which is used to create the class name of the script)
* @param args the command line arguments to pass in
*/
public Object run(final Reader in, final String fileName, String[] args) throws CompilationFailedException {
GroovyCodeSource gcs = AccessController.doPrivileged((PrivilegedAction) () -> new GroovyCodeSource(in, fileName, DEFAULT_CODE_BASE));
Class scriptClass = parseClass(gcs);
return runScriptOrMainOrTestOrRunnable(scriptClass, args);
}
public Object getVariable(String name) {
return context.getVariables().get(name);
}
public void setVariable(String name, Object value) {
context.setVariable(name, value);
}
public void removeVariable(String name) {
context.removeVariable(name);
}
/**
* Evaluates some script against the current Binding and returns the result
*
* @param codeSource
* @throws CompilationFailedException
*/
public Object evaluate(GroovyCodeSource codeSource) throws CompilationFailedException {
Script script = parse(codeSource);
return script.run();
}
/**
* Evaluates some script against the current Binding and returns the result
*
* @param scriptText the text of the script
*/
public Object evaluate(final String scriptText) throws CompilationFailedException {
return evaluate(scriptText, generateScriptName(), DEFAULT_CODE_BASE);
}
/**
* Evaluates some script against the current Binding and returns the result
*
* @param scriptText the text of the script
* @param fileName is the logical file name of the script (which is used to create the class name of the script)
*/
public Object evaluate(String scriptText, String fileName) throws CompilationFailedException {
return evaluate(scriptText, fileName, DEFAULT_CODE_BASE);
}
/**
* Evaluates some script against the current Binding and returns the result.
* The .class file created from the script is given the supplied codeBase
*/
public Object evaluate(final String scriptText, final String fileName, final String codeBase) throws CompilationFailedException {
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
sm.checkPermission(new GroovyCodeSourcePermission(codeBase));
}
GroovyCodeSource gcs = AccessController.doPrivileged((PrivilegedAction) () -> new GroovyCodeSource(scriptText, fileName, codeBase));
return evaluate(gcs);
}
/**
* Evaluates some script against the current Binding and returns the result
*
* @param file is the file of the script (which is used to create the class name of the script)
*/
public Object evaluate(File file) throws CompilationFailedException, IOException {
return evaluate(new GroovyCodeSource(file, config.getSourceEncoding()));
}
/**
* Evaluates some script against the current Binding and returns the result
*
* @param uri is the URI of the script (which is used to create the class name of the script)
*/
public Object evaluate(URI uri) throws CompilationFailedException, IOException {
return evaluate(new GroovyCodeSource(uri));
}
/**
* Evaluates some script against the current Binding and returns the result
*
* @param in the stream reading the script
*/
public Object evaluate(Reader in) throws CompilationFailedException {
return evaluate(in, generateScriptName());
}
/**
* Evaluates some script against the current Binding and returns the result
*
* @param in the stream reading the script
* @param fileName is the logical file name of the script (which is used to create the class name of the script)
*/
public Object evaluate(Reader in, String fileName) throws CompilationFailedException {
Script script = null;
try {
script = parse(in, fileName);
return script.run();
} finally {
if (script != null) {
InvokerHelper.removeClass(script.getClass());
}
}
}
/**
* Parses the given script and returns it ready to be run
*
* @param reader the stream reading the script
* @param fileName is the logical file name of the script (which is used to create the class name of the script)
* @return the parsed script which is ready to be run via {@link Script#run()}
*/
public Script parse(final Reader reader, final String fileName) throws CompilationFailedException {
return parse(new GroovyCodeSource(reader, fileName, DEFAULT_CODE_BASE));
}
/**
* Parses the groovy code contained in codeSource and returns a java class.
*/
private Class parseClass(final GroovyCodeSource codeSource) throws CompilationFailedException {
// Don't cache scripts
return loader.parseClass(codeSource, false);
}
/**
* Parses the given script and returns it ready to be run. When running in a secure environment
* (-Djava.security.manager) codeSource.getCodeSource() determines what policy grants should be
* given to the script.
*
* @param codeSource
* @return ready to run script
*/
public Script parse(final GroovyCodeSource codeSource) throws CompilationFailedException {
return InvokerHelper.createScript(parseClass(codeSource), context);
}
/**
* Parses the given script and returns it ready to be run
*
* @param file is the file of the script (which is used to create the class name of the script)
*/
public Script parse(File file) throws CompilationFailedException, IOException {
return parse(new GroovyCodeSource(file, config.getSourceEncoding()));
}
/**
* Parses the given script and returns it ready to be run
*
* @param uri is the URI of the script (which is used to create the class name of the script)
*/
public Script parse(URI uri) throws CompilationFailedException, IOException {
return parse(new GroovyCodeSource(uri));
}
/**
* Parses the given script and returns it ready to be run
*
* @param scriptText the text of the script
*/
public Script parse(String scriptText) throws CompilationFailedException {
return parse(scriptText, generateScriptName());
}
public Script parse(final String scriptText, final String fileName) throws CompilationFailedException {
GroovyCodeSource gcs = AccessController.doPrivileged((PrivilegedAction) () -> new GroovyCodeSource(scriptText, fileName, DEFAULT_CODE_BASE));
return parse(gcs);
}
/**
* Parses the given script and returns it ready to be run
*
* @param in the stream reading the script
*/
public Script parse(Reader in) throws CompilationFailedException {
return parse(in, generateScriptName());
}
protected String generateScriptName() {
return "Script" + counter.incrementAndGet() + ".groovy";
}
}
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