/**
* 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 org.jooby.internal.assets;
import static java.util.Objects.requireNonNull;
import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.StandardWatchEventKinds;
import java.nio.file.WatchEvent.Kind;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.atomic.AtomicBoolean;
import org.jooby.MediaType;
import org.jooby.Request;
import org.jooby.Response;
import org.jooby.Route;
import org.jooby.assets.AssetCompiler;
import org.jooby.assets.AssetException;
import org.jooby.assets.AssetProblem;
import org.jooby.internal.URLAsset;
import com.google.common.collect.Lists;
import com.typesafe.config.Config;
import javaslang.control.Try;
public class LiveCompiler implements Route.Handler {
private final Config conf;
private final AssetCompiler compiler;
private final Map<String, AssetException> errors = new ConcurrentHashMap<>();
private final Watcher watcher;
private final AtomicBoolean firstRun = new AtomicBoolean(true);
private Path basedir;
public LiveCompiler(final Config conf, final AssetCompiler compiler) throws IOException {
this.conf = requireNonNull(conf, "Config is required.");
this.compiler = requireNonNull(compiler, "Asset compiler is required.");
this.basedir = Paths.get("public");
this.watcher = new Watcher(this::onChange, basedir);
}
private void onChange(final Kind<?> kind, final Path path) {
File outputdir = new File(conf.getString("application.tmpdir"), "__public_");
outputdir.mkdirs();
String filename = Route.normalize(Try.of(() -> path.subpath(1, path.getNameCount()).toString())
.getOrElse(path.toString()));
try {
boolean firstRun = this.firstRun.compareAndSet(true, false);
if (!firstRun && !path.equals(basedir)) {
if (!compiler.contains(path.toString())) {
return;
}
}
if (kind == StandardWatchEventKinds.ENTRY_DELETE) {
errors.remove(filename);
} else {
if (Files.isDirectory(path)) {
errors.clear();
compiler.build(conf.getString("application.env"), outputdir);
} else {
MediaType type = MediaType.byPath(path).orElse(MediaType.octetstream);
compiler.build(new URLAsset(path.toUri().toURL(), filename, type));
errors.remove(filename);
}
}
} catch (AssetException ex) {
String localname = ex.getProblems().stream()
.findFirst()
.map(AssetProblem::getFilename)
.orElse(filename);
errors.put(localname, rewrite(ex));
} catch (Exception ex) {
AssetException assetEx = rewrite(new AssetException("compiler",
new AssetProblem(filename, -1, -1, ex.getMessage(), null), ex));
errors.put(filename, assetEx);
}
}
/**
* Add a virtual/fake stacktrace element with the offending file, useful for whoops.
*
* @param ex Stack trace to rewrite.
* @return Same exception with new stacktrace.
*/
private AssetException rewrite(final AssetException ex) {
List<StackTraceElement> stacktrace = Lists.newArrayList(ex.getStackTrace());
List<AssetProblem> problems = ex.getProblems();
AssetProblem head = problems.get(0);
stacktrace.add(0,
new StackTraceElement(head.getFilename(), "", head.getFilename(), head.getLine()));
ex.setStackTrace(stacktrace.toArray(new StackTraceElement[stacktrace.size()]));
return ex;
}
@Override
public void handle(final Request req, final Response rsp) throws Throwable {
if (req.param("assets.sync").isSet()) {
onChange(StandardWatchEventKinds.ENTRY_MODIFY, basedir);
}
if (errors.size() > 0) {
throw errors.values().iterator().next();
}
}
public void start() {
watcher.start();
}
public void stop() throws Exception {
watcher.stop();
}
}