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Truffle is a multi-language framework for executing dynamic languages
that achieves high performance when combined with Graal.
/*
* Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* The Universal Permissive License (UPL), Version 1.0
*
* Subject to the condition set forth below, permission is hereby granted to any
* person obtaining a copy of this software, associated documentation and/or
* data (collectively the "Software"), free of charge and under any and all
* copyright rights in the Software, and any and all patent rights owned or
* freely licensable by each licensor hereunder covering either (i) the
* unmodified Software as contributed to or provided by such licensor, or (ii)
* the Larger Works (as defined below), to deal in both
*
* (a) the Software, and
*
* (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
* one is included with the Software each a "Larger Work" to which the Software
* is contributed by such licensors),
*
* without restriction, including without limitation the rights to copy, create
* derivative works of, display, perform, and distribute the Software and make,
* use, sell, offer for sale, import, export, have made, and have sold the
* Software and the Larger Work(s), and to sublicense the foregoing rights on
* either these or other terms.
*
* This license is subject to the following condition:
*
* The above copyright notice and either this complete permission notice or at a
* minimum a reference to the UPL must be included in all copies or substantial
* portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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*/
package com.oracle.truffle.polyglot;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.lang.ref.Reference;
import java.lang.ref.WeakReference;
import java.nio.file.Paths;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.concurrent.TimeUnit;
import org.graalvm.polyglot.io.ProcessHandler;
final class ProcessHandlers {
private ProcessHandlers() {
throw new IllegalStateException("Instance is not allowed");
}
static ProcessHandler newDefaultProcessHandler() {
return new DefaultProcessHandler();
}
static boolean isDefault(ProcessHandler handler) {
return handler instanceof DefaultProcessHandler;
}
static Process decorate(PolyglotLanguageContext owner, List cmd, Process process,
OutputStream out, OutputStream err) {
ProcessDecorator decorator = new ProcessDecorator(owner, cmd.get(0), process, out, err);
synchronized (owner.context) {
owner.context.subProcesses.add(decorator);
}
return decorator;
}
private static final class DefaultProcessHandler implements ProcessHandler {
@Override
public Process start(ProcessCommand command) throws IOException {
ProcessBuilder builder = new ProcessBuilder(command.getCommand()).redirectErrorStream(command.isRedirectErrorStream()).redirectInput(
translateRedirect(command.getInputRedirect())).redirectOutput(translateRedirect(command.getOutputRedirect())).redirectError(translateRedirect(command.getErrorRedirect()));
Map env = builder.environment();
env.clear();
env.putAll(command.getEnvironment());
String cwd = command.getDirectory();
if (cwd != null) {
builder.directory(Paths.get(cwd).toFile());
}
return builder.start();
}
private static java.lang.ProcessBuilder.Redirect translateRedirect(ProcessHandler.Redirect redirect) {
if (redirect == Redirect.PIPE) {
return java.lang.ProcessBuilder.Redirect.PIPE;
} else if (redirect == Redirect.INHERIT) {
return java.lang.ProcessBuilder.Redirect.INHERIT;
} else {
throw new IllegalStateException("Unsupported redirect: " + redirect);
}
}
}
static final class ProcessDecorator extends Process {
private final Reference owner;
private final String command;
private final Process delegate;
private final Thread outCopier;
private final Thread errCopier;
private ProcessDecorator(
PolyglotLanguageContext owner,
String command,
Process delegate,
OutputStream out,
OutputStream err) {
Objects.requireNonNull(owner, "Owner must be non null");
Objects.requireNonNull(command, "Command muset be non null");
Objects.requireNonNull(delegate, "Delegate must be non null.");
this.owner = new WeakReference<>(owner);
this.command = command;
this.delegate = delegate;
this.outCopier = out == null ? null : new CopierThread(createThreadName(owner, command, "stdout"), delegate.getInputStream(), out);
this.errCopier = err == null ? null : new CopierThread(createThreadName(owner, command, "stderr"), delegate.getErrorStream(), err);
if (outCopier != null) {
outCopier.start();
}
if (errCopier != null) {
errCopier.start();
}
}
PolyglotLanguageContext getOwner() {
return owner.get();
}
String getCommand() {
return command;
}
@Override
public OutputStream getOutputStream() {
return delegate.getOutputStream();
}
@Override
public InputStream getInputStream() {
if (outCopier == null) {
return delegate.getInputStream();
}
return null;
}
@Override
public InputStream getErrorStream() {
if (errCopier == null) {
return delegate.getErrorStream();
}
return null;
}
@Override
public int waitFor() throws InterruptedException {
int res = delegate.waitFor();
waitForCopiers();
removeFromActiveSubProcesses();
return res;
}
@Override
public int exitValue() {
int result = delegate.exitValue();
removeFromActiveSubProcesses();
return result;
}
@Override
public void destroy() {
delegate.destroy();
}
@Override
public Process destroyForcibly() {
Process result = delegate.destroyForcibly();
assert result == delegate;
return this;
}
@Override
public boolean isAlive() {
boolean result = delegate.isAlive();
if (!result) {
removeFromActiveSubProcesses();
}
return result;
}
@Override
public boolean waitFor(long timeout, TimeUnit unit) throws InterruptedException {
boolean res = delegate.waitFor(timeout, unit);
if (res) {
waitForCopiers();
removeFromActiveSubProcesses();
}
return res;
}
private void waitForCopiers() throws InterruptedException {
if (outCopier != null) {
outCopier.join();
}
if (errCopier != null) {
errCopier.join();
}
}
private void removeFromActiveSubProcesses() {
PolyglotLanguageContext languageContext = owner.get();
if (languageContext != null) {
synchronized (languageContext.context) {
languageContext.context.subProcesses.remove(this);
}
}
}
private static String createThreadName(PolyglotLanguageContext creator, String command, String suffix) {
return "Polyglot-" + creator.language.getId() + "-" + command + "-" + suffix;
}
}
private static final class CopierThread extends Thread {
private static final int BUFSIZE = 8192;
private final InputStream in;
private final OutputStream out;
private final byte[] buffer;
CopierThread(String name, InputStream in, OutputStream out) {
Objects.requireNonNull(name, "Name must be non null.");
Objects.requireNonNull(in, "In must be non null.");
Objects.requireNonNull(out, "Out must be non null.");
setName(name);
this.in = in;
this.out = out;
this.buffer = new byte[BUFSIZE];
}
@Override
public void run() {
try {
while (true) {
if (isInterrupted()) {
return;
}
int read = in.read(buffer, 0, buffer.length);
if (read == -1) {
return;
}
out.write(buffer, 0, read);
}
} catch (IOException e) {
}
}
}
}