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https://github.com/plexusorg/Plex-FAWE.git
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Merge pull request #400 from sk89q/bugfix/timed-calc
Attach a configurable timeout to expression evaluation
This commit is contained in:
commit
9f43963379
@ -137,6 +137,9 @@ history:
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size: 15
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expiration: 10
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calculation:
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timeout: 100
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wand-item: minecraft:wooden_axe
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shell-save-type:
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no-double-slash: false
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@ -127,6 +127,7 @@ public abstract class LocalConfiguration {
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public String navigationWand = ItemTypes.COMPASS.getId();
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public int navigationWandMaxDistance = 50;
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public int scriptTimeout = 3000;
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public int calculationTimeout = 100;
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public Set<String> allowedDataCycleBlocks = new HashSet<>();
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public String saveDir = "schematics";
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public String scriptsDir = "craftscripts";
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@ -19,6 +19,8 @@
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package com.sk89q.worldedit.internal.expression;
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import com.google.common.util.concurrent.ThreadFactoryBuilder;
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import com.sk89q.worldedit.WorldEdit;
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import com.sk89q.worldedit.internal.expression.lexer.Lexer;
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import com.sk89q.worldedit.internal.expression.lexer.tokens.Token;
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import com.sk89q.worldedit.internal.expression.parser.Parser;
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@ -34,6 +36,13 @@ import java.util.HashMap;
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import java.util.List;
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import java.util.Map;
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import java.util.Stack;
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import java.util.concurrent.Callable;
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import java.util.concurrent.ExecutionException;
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import java.util.concurrent.ExecutorService;
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import java.util.concurrent.Executors;
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import java.util.concurrent.Future;
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import java.util.concurrent.TimeUnit;
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import java.util.concurrent.TimeoutException;
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/**
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* Compiles and evaluates expressions.
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@ -69,6 +78,11 @@ import java.util.Stack;
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public class Expression {
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private static final ThreadLocal<Stack<Expression>> instance = new ThreadLocal<>();
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private static final ExecutorService evalThread = Executors.newCachedThreadPool(
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new ThreadFactoryBuilder()
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.setDaemon(true)
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.setNameFormat("worldedit-expression-eval-%d")
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.build());
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private final Map<String, RValue> variables = new HashMap<>();
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private final String[] variableNames;
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@ -113,15 +127,36 @@ public class Expression {
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((Variable) invokable).value = values[i];
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}
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Future<Double> result = evalThread.submit(new Callable<Double>() {
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@Override
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public Double call() throws Exception {
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pushInstance();
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try {
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return root.getValue();
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} catch (ReturnException e) {
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return e.getValue();
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} finally {
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popInstance();
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}
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}
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});
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try {
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return result.get(WorldEdit.getInstance().getConfiguration().calculationTimeout, TimeUnit.MILLISECONDS);
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} catch (InterruptedException e) {
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Thread.currentThread().interrupt();
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throw new RuntimeException(e);
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} catch (ExecutionException e) {
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Throwable cause = e.getCause();
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if (cause instanceof ReturnException) {
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return ((ReturnException) cause).getValue();
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}
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if (cause instanceof RuntimeException) {
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throw (RuntimeException) cause;
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}
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throw new RuntimeException(cause);
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} catch (TimeoutException e) {
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result.cancel(true);
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throw new EvaluationException(-1, "Calculations exceeded time limit.");
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}
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}
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public void optimize() throws EvaluationException {
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root = root.optimize();
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@ -146,20 +181,20 @@ public class Expression {
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}
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private void pushInstance() {
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Stack<Expression> foo = instance.get();
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if (foo == null) {
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instance.set(foo = new Stack<>());
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Stack<Expression> threadLocalExprStack = instance.get();
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if (threadLocalExprStack == null) {
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instance.set(threadLocalExprStack = new Stack<>());
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}
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foo.push(this);
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threadLocalExprStack.push(this);
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}
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private void popInstance() {
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Stack<Expression> foo = instance.get();
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Stack<Expression> threadLocalExprStack = instance.get();
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foo.pop();
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threadLocalExprStack.pop();
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if (foo.isEmpty()) {
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if (threadLocalExprStack.isEmpty()) {
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instance.set(null);
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}
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}
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@ -50,6 +50,9 @@ public class For extends Node {
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if (iterations > 256) {
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throw new EvaluationException(getPosition(), "Loop exceeded 256 iterations.");
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}
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if (Thread.interrupted()) {
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throw new EvaluationException(getPosition(), "Calculations exceeded time limit.");
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}
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++iterations;
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try {
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@ -53,6 +53,9 @@ public class SimpleFor extends Node {
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if (iterations > 256) {
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throw new EvaluationException(getPosition(), "Loop exceeded 256 iterations.");
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}
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if (Thread.interrupted()) {
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throw new EvaluationException(getPosition(), "Calculations exceeded time limit.");
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}
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++iterations;
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try {
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@ -49,6 +49,9 @@ public class While extends Node {
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if (iterations > 256) {
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throw new EvaluationException(getPosition(), "Loop exceeded 256 iterations.");
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}
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if (Thread.interrupted()) {
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throw new EvaluationException(getPosition(), "Calculations exceeded time limit.");
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}
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++iterations;
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try {
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@ -66,6 +69,9 @@ public class While extends Node {
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if (iterations > 256) {
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throw new EvaluationException(getPosition(), "Loop exceeded 256 iterations.");
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}
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if (Thread.interrupted()) {
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throw new EvaluationException(getPosition(), "Calculations exceeded time limit.");
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}
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++iterations;
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try {
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@ -109,6 +109,7 @@ public class PropertiesConfiguration extends LocalConfiguration {
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navigationWandMaxDistance = getInt("nav-wand-distance", navigationWandMaxDistance);
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navigationUseGlass = getBool("nav-use-glass", navigationUseGlass);
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scriptTimeout = getInt("scripting-timeout", scriptTimeout);
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calculationTimeout = getInt("calculation-timeout", calculationTimeout);
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saveDir = getString("schematic-save-dir", saveDir);
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scriptsDir = getString("craftscript-dir", scriptsDir);
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butcherDefaultRadius = getInt("butcher-default-radius", butcherDefaultRadius);
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@ -105,6 +105,8 @@ public class YAMLConfiguration extends LocalConfiguration {
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scriptTimeout = config.getInt("scripting.timeout", scriptTimeout);
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scriptsDir = config.getString("scripting.dir", scriptsDir);
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calculationTimeout = config.getInt("calculation.timeout", calculationTimeout);
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saveDir = config.getString("saving.dir", saveDir);
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allowSymlinks = config.getBoolean("files.allow-symbolic-links", false);
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@ -22,15 +22,33 @@ package com.sk89q.worldedit.internal.expression;
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import static java.lang.Math.atan2;
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import static java.lang.Math.sin;
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import static org.junit.Assert.assertEquals;
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import static org.junit.Assert.assertTrue;
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import static org.junit.Assert.fail;
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import org.junit.Before;
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import org.junit.Test;
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import org.mockito.Mockito;
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import com.sk89q.worldedit.LocalConfiguration;
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import com.sk89q.worldedit.WorldEdit;
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import com.sk89q.worldedit.extension.platform.Platform;
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import com.sk89q.worldedit.internal.expression.lexer.LexerException;
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import com.sk89q.worldedit.internal.expression.parser.ParserException;
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import com.sk89q.worldedit.internal.expression.runtime.EvaluationException;
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import com.sk89q.worldedit.internal.expression.runtime.ExpressionEnvironment;
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import org.junit.Test;
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public class ExpressionTest {
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@Before
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public void setup() {
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Platform mockPlat = Mockito.mock(Platform.class);
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Mockito.when(mockPlat.getConfiguration()).thenReturn(new LocalConfiguration() {
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@Override
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public void load() {
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}
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});
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WorldEdit.getInstance().getPlatformManager().register(mockPlat);
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}
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@Test
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public void testEvaluate() throws ExpressionException {
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// check
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@ -162,6 +180,16 @@ public class ExpressionTest {
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assertEquals(1, simpleEval("!queryRel(3,4,5,100,200)"), 0);
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}
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@Test
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public void testTimeout() throws Exception {
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try {
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simpleEval("for(i=0;i<256;i++){for(j=0;j<256;j++){for(k=0;k<256;k++){for(l=0;l<256;l++){ln(pi)}}}}");
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fail("Loop was not stopped.");
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} catch (EvaluationException e) {
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assertTrue(e.getMessage().contains("Calculations exceeded time limit"));
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}
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}
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private double simpleEval(String expressionString) throws ExpressionException {
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final Expression expression = compile(expressionString);
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