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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.container.core.config;
import com.yahoo.collections.PredicateSplit;
import com.yahoo.config.FileReference;
import com.yahoo.container.Container;
import com.yahoo.filedistribution.fileacquirer.FileAcquirer;
import com.yahoo.osgi.Osgi;
import org.osgi.framework.Bundle;
import org.osgi.framework.wiring.BundleRevision;
import java.io.File;
import java.util.Arrays;
import java.util.HashSet;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.TimeUnit;
import java.util.logging.Logger;
import static com.yahoo.collections.PredicateSplit.partition;
import static com.yahoo.container.core.BundleLoaderProperties.DISK_BUNDLE_PREFIX;
/**
* Manages the set of installed 3rd-party component bundles.
*
* @author Tony Vaagenes
*/
public class BundleLoader {
private final List<Bundle> initialBundles;
private final Map<FileReference, List<Bundle>> reference2Bundles = new LinkedHashMap<>();
private final Logger log = Logger.getLogger(BundleLoader.class.getName());
private final Osgi osgi;
public BundleLoader(Osgi osgi) {
this.osgi = osgi;
initialBundles = Arrays.asList(osgi.getBundles());
}
private List<Bundle> obtainBundles(FileReference reference, FileAcquirer fileAcquirer) throws InterruptedException {
File file = fileAcquirer.waitFor(reference, 7, TimeUnit.DAYS);
return osgi.install(file.getAbsolutePath());
}
/**
* @return the number of bundles installed by this call.
*/
private int install(List<FileReference> references) {
Set<FileReference> bundlesToInstall = new HashSet<>(references);
bundlesToInstall.removeAll(reference2Bundles.keySet());
PredicateSplit<FileReference> bundlesToInstall_isDisk = partition(bundlesToInstall, BundleLoader::isDiskBundle);
installBundlesFromDisk(bundlesToInstall_isDisk.trueValues);
installBundlesFromFileDistribution(bundlesToInstall_isDisk.falseValues);
startBundles();
return bundlesToInstall.size();
}
private static boolean isDiskBundle(FileReference fileReference) {
return fileReference.value().startsWith(DISK_BUNDLE_PREFIX);
}
private void installBundlesFromDisk(List<FileReference> bundlesToInstall) {
for (FileReference reference : bundlesToInstall) {
try {
installBundleFromDisk(reference);
}
catch(Exception e) {
throw new RuntimeException("Could not install bundle '" + reference + "'", e);
}
}
}
private void installBundlesFromFileDistribution(List<FileReference> bundlesToInstall) {
if (!bundlesToInstall.isEmpty()) {
FileAcquirer fileAcquirer = Container.get().getFileAcquirer();
boolean hasFileDistribution = (fileAcquirer != null);
if (hasFileDistribution) {
installWithFileDistribution(bundlesToInstall, fileAcquirer);
} else {
log.warning("Can't retrieve bundles since file distribution is disabled.");
}
}
}
private void installBundleFromDisk(FileReference reference) {
assert(reference.value().startsWith(DISK_BUNDLE_PREFIX));
String referenceFileName = reference.value().substring(DISK_BUNDLE_PREFIX.length());
log.info("Installing bundle from disk with reference '" + reference.value() + "'");
File file = new File(referenceFileName);
if ( ! file.exists()) {
throw new IllegalArgumentException("Reference '" + reference.value() + "' not found on disk.");
}
List<Bundle> bundles = osgi.install(file.getAbsolutePath());
reference2Bundles.put(reference, bundles);
}
private void installWithFileDistribution(List<FileReference> bundlesToInstall, FileAcquirer fileAcquirer) {
for (FileReference reference : bundlesToInstall) {
try {
log.info("Installing bundle with reference '" + reference.value() + "'");
List<Bundle> bundles = obtainBundles(reference, fileAcquirer);
reference2Bundles.put(reference, bundles);
}
catch(Exception e) {
throw new RuntimeException("Could not install bundle '" + reference + "'", e);
}
}
}
//all bundles must have been started first to ensure correct package resolution.
private void startBundles() {
for (List<Bundle> bundles : reference2Bundles.values()) {
for (Bundle bundle : bundles) {
try {
if (!isFragment(bundle))
bundle.start();
} catch(Exception e) {
throw new RuntimeException("Could not start bundle '" + bundle.getSymbolicName() + "'", e);
}
}
}
}
// The OSGi APIs are just getting worse...
private boolean isFragment(Bundle bundle) {
BundleRevision bundleRevision = bundle.adapt(BundleRevision.class);
if (bundleRevision == null)
throw new NullPointerException("Null bundle revision means that bundle has probably been uninstalled: " +
bundle.getSymbolicName() + ":" + bundle.getVersion());
return (bundleRevision.getTypes() & BundleRevision.TYPE_FRAGMENT) != 0;
}
/**
* Returns the number of uninstalled bundles
*/
private int retainOnly(List<FileReference> newReferences) {
Set<Bundle> bundlesToRemove = new HashSet<>(Arrays.asList(osgi.getBundles()));
for (FileReference fileReferenceToKeep: newReferences) {
if (reference2Bundles.containsKey(fileReferenceToKeep))
bundlesToRemove.removeAll(reference2Bundles.get(fileReferenceToKeep));
}
bundlesToRemove.removeAll(initialBundles);
for (Bundle bundle : bundlesToRemove) {
log.info("Removing bundle '" + bundle.toString() + "'");
osgi.uninstall(bundle);
}
Set<FileReference> fileReferencesToRemove = new HashSet<>(reference2Bundles.keySet());
fileReferencesToRemove.removeAll(newReferences);
for (FileReference fileReferenceToRemove : fileReferencesToRemove) {
reference2Bundles.remove(fileReferenceToRemove);
}
return bundlesToRemove.size();
}
public synchronized int use(List<FileReference> bundles) {
int removedBundles = retainOnly(bundles);
int installedBundles = install(bundles);
startBundles();
log.info(removedBundles + " bundles were removed, and " + installedBundles + " bundles were installed.");
log.info(installedBundlesMessage());
return removedBundles + installedBundles;
}
private String installedBundlesMessage() {
StringBuilder sb = new StringBuilder("Installed bundles: {" );
for (Bundle b : osgi.getBundles())
sb.append("[" + b.getBundleId() + "]" + b.getSymbolicName() + ":" + b.getVersion() + ", ");
sb.setLength(sb.length() - 2);
sb.append("}");
return sb.toString();
}
}
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