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/*
* Copyright 2022 predic8 GmbH, www.predic8.com
*
* Licensed 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 com.predic8.membrane.core.lang.javascript;
import com.predic8.membrane.core.lang.*;
import org.graalvm.polyglot.*;
import org.slf4j.*;
import java.util.*;
import java.util.concurrent.*;
import java.util.function.*;
public class GraalVMJavascriptSupport extends LanguageSupport {
private static final Logger log = LoggerFactory.getLogger(GraalVMJavascriptSupport.class);
private abstract static class GraalVMJavascriptExecutorPool extends ScriptExecutorPool {
// Permissions are needed to access the Java Host from Javascript e.g. access to Exchange
private static final Context context = Context.newBuilder()
.allowHostAccess(HostAccess.ALL)
.allowHostClassLookup(s -> true)
.allowPolyglotAccess(PolyglotAccess.ALL).build();
private final String javascriptCode;
private GraalVMJavascriptExecutorPool(ExecutorService executorService, String expression) {
this.javascriptCode = expression;
init(executorService);
}
@Override
protected Object invoke(Source source, Map parameters) {
try {
synchronized (context) {
parameters.forEach((key, value) -> context.getBindings("js").putMember(key, value));
// Eval caches the compiled script internally. No need to call parse and try to
// cache it in Membrane.
Value js = context.eval(source);
if (js.isHostObject())
return js.asHostObject();
return js;
}
} catch (PolyglotException e) {
if (e.isSyntaxError()) {
SourceSection location = e.getSourceLocation();
log.warn("Syntax error compiling Javascript at {} line {} position {}", location.getSource(), location.getStartLine(), location.getCharIndex());
log.warn("Location " + location);
} else {
log.warn("");
}
throw e;
} catch (Exception e) {
log.error("Error compiling script:", e);
throw new RuntimeException("Error compiling script:", e);
}
}
@Override
protected Source createOneScript() {
return Source.create("js", javascriptCode);
}
}
@Override
public Function