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/*
* Copyright 2010-2013 Ning, Inc.
* Copyright 2014 Groupon, Inc
* Copyright 2014 The Billing Project, LLC
*
* The Billing Project 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.killbill.billing.osgi.pluginconf;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import javax.annotation.Nullable;
import javax.inject.Inject;
import org.killbill.billing.osgi.api.config.PluginConfig;
import org.killbill.billing.osgi.api.config.PluginJavaConfig;
import org.killbill.billing.osgi.api.config.PluginLanguage;
import org.killbill.billing.osgi.api.config.PluginRubyConfig;
import org.killbill.billing.osgi.config.OSGIConfig;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.ObjectMapper;
public class PluginFinder {
static final String SELECTED_VERSION_LINK_NAME = "SET_DEFAULT";
static final String TMP_DIR_NAME = "tmp";
static final String DISABLED_FILE_NAME = "disabled.txt"; // See similar definition in KillbillActivatorBase
static final String IDENTIFIERS_FILE_NAME = "plugin_identifiers.json";
private final Logger logger = LoggerFactory.getLogger(PluginFinder.class);
private final OSGIConfig osgiConfig;
private final Map> allPlugins;
private final Map identifiers;
private final ObjectMapper mapper;
@Inject
public PluginFinder(final OSGIConfig osgiConfig) {
this.osgiConfig = osgiConfig;
this.mapper = new ObjectMapper();
this.allPlugins = new HashMap>();
this.identifiers = new HashMap();
}
public List getLatestJavaPlugins() throws PluginConfigException, IOException {
return getLatestPluginForLanguage(PluginLanguage.JAVA);
}
public List getLatestRubyPlugins() throws PluginConfigException, IOException {
return getLatestPluginForLanguage(PluginLanguage.RUBY);
}
public List getVersionsForPlugin(final String lookupName, @Nullable final String version) throws PluginConfigException, IOException {
loadPluginsIfRequired(false);
final List result = new LinkedList();
for (final String pluginName : allPlugins.keySet()) {
if (pluginName.equals(lookupName)) {
for (final PluginConfig cur : allPlugins.get(pluginName)) {
if (version == null || cur.getVersion().equals(version)) {
result.add(cur);
}
}
}
}
return result;
}
public String getPluginVersionSelectedForStart(final String pluginName) {
final LinkedList pluginConfigs = allPlugins.get(pluginName);
return pluginConfigs != null && !pluginConfigs.isEmpty() ? pluginConfigs.get(0).getVersion() : null;
}
public Map> getAllPlugins() {
return allPlugins;
}
public void reloadPlugins() throws PluginConfigException, IOException {
loadPluginsIfRequired(true);
}
public PluginIdentifier resolvePluginKey(final String pluginKey) {
return identifiers.get(pluginKey);
}
private List getLatestPluginForLanguage(final PluginLanguage pluginLanguage) throws PluginConfigException, IOException {
loadPluginsIfRequired(false);
final List result = new LinkedList();
for (final String pluginName : allPlugins.keySet()) {
@SuppressWarnings("unchecked") final T plugin = (T) allPlugins.get(pluginName).get(0);
if (pluginLanguage != plugin.getPluginLanguage()) {
continue;
}
result.add(plugin);
}
return result;
}
private void loadPluginsIfRequired(final boolean reloadPlugins) throws PluginConfigException, IOException {
synchronized (allPlugins) {
if (!reloadPlugins && !allPlugins.isEmpty()) {
return;
}
allPlugins.clear();
readPluginIdentifiers();
loadPluginsForLanguage(PluginLanguage.RUBY);
loadPluginsForLanguage(PluginLanguage.JAVA);
// Order for each plugin based on DefaultPluginConfig sort method:
// (order first based on SELECTED_VERSION_LINK_NAME and then decreasing version number)
//
final Iterator pluginNamesIterator = allPlugins.keySet().iterator();
while (pluginNamesIterator.hasNext()) {
final String pluginName = pluginNamesIterator.next();
final LinkedList versionsForPlugin = allPlugins.get(pluginName);
// If all entries were disabled or the SELECTED_VERSION_LINK_NAME was disabled we end up with nothing, it is as if the plugin did not exist
if (versionsForPlugin.isEmpty()) {
pluginNamesIterator.remove();
continue;
}
Collections.sort(versionsForPlugin);
// Make sure first entry is set with isSelectedForStart = true
final PluginConfig firstValue = versionsForPlugin.removeFirst();
final PluginConfig newFirstValue = firstValue.getPluginLanguage() == PluginLanguage.RUBY ?
new DefaultPluginRubyConfig((DefaultPluginRubyConfig) firstValue, true) :
new DefaultPluginJavaConfig((DefaultPluginJavaConfig) firstValue, true);
versionsForPlugin.addFirst(newFirstValue);
}
}
}
private void readPluginIdentifiers() {
final String identifierFileName = osgiConfig.getRootInstallationDir() + "/plugins/" + IDENTIFIERS_FILE_NAME;
final File identifierFile = new File(identifierFileName);
if (!identifierFile.exists() || !identifierFile.isFile()) {
logger.warn("File non existent: Skipping parsing of " + IDENTIFIERS_FILE_NAME);
return;
}
try {
identifiers.clear();
final Map map = mapper.readValue(identifierFile, new TypeReference>() {});
identifiers.putAll(map);
} catch (final IOException e) {
logger.warn("Exception when parsing " + IDENTIFIERS_FILE_NAME + ":", e);
return;
}
}
private String resolveVersionToStartLink(final File pluginVersionsRoot) throws IOException {
final File selectedVersionLink = new File(pluginVersionsRoot + "/" + SELECTED_VERSION_LINK_NAME);
if (selectedVersionLink.exists() && selectedVersionLink.isDirectory()) {
return selectedVersionLink.getCanonicalFile().getName();
}
return null;
}
private void loadPluginsForLanguage(final PluginLanguage pluginLanguage) throws PluginConfigException, IOException {
final String rootDirPath = osgiConfig.getRootInstallationDir() + "/plugins/" + pluginLanguage.toString().toLowerCase();
final File rootDir = new File(rootDirPath);
if (!rootDir.exists() || !rootDir.isDirectory()) {
logger.warn("Configuration root dir {} is not a valid directory", rootDirPath);
return;
}
final File[] files = rootDir.listFiles();
if (files == null) {
return;
}
for (final File curPlugin : files) {
// Skip any non directory entry
if (!curPlugin.isDirectory()) {
logger.warn("Skipping entry {} in directory {}", curPlugin.getName(), rootDir.getAbsolutePath());
continue;
}
final String pluginName = curPlugin.getName();
final File[] filesInDir = curPlugin.listFiles();
if (filesInDir == null) {
continue;
}
final String versionToStart = resolveVersionToStartLink(curPlugin);
LinkedList curPluginVersionlist = allPlugins.get(pluginName);
if (curPluginVersionlist == null) {
curPluginVersionlist = new LinkedList();
allPlugins.put(pluginName, curPluginVersionlist);
}
for (final File curVersion : filesInDir) {
// Skip any non directory entry
if (!curVersion.isDirectory()) {
logger.warn("Skipping entry {} in directory {}", curPlugin.getName(), rootDir.getAbsolutePath());
continue;
}
final String version = curVersion.getName();
// Skip the symlink 'SELECTED_VERSION_LINK_NAME' if exists
if (SELECTED_VERSION_LINK_NAME.equals(version)) {
continue;
}
final boolean isVersionToStartLink = versionToStart != null && versionToStart.equals(version);
final PluginConfig plugin;
try {
plugin = extractPluginConfig(pluginLanguage, pluginName, version, curVersion, isVersionToStartLink);
} catch (final PluginConfigException e) {
logger.warn("Skipping plugin {}: {}", pluginName, e.getMessage());
continue;
}
// Add the entry if this is not marked as 'disabled'
if (!plugin.isDisabled()) {
curPluginVersionlist.add(plugin);
logger.info("Adding plugin {} ", plugin.getPluginVersionnedName());
}
}
}
}
private String findPluginKey(final String pluginName, final PluginLanguage pluginLanguage) {
for (final String key : identifiers.keySet()) {
final PluginIdentifier value = identifiers.get(key);
if (value.getPluginName().equals(pluginName) && value.getLanguage().equalsIgnoreCase(pluginLanguage.name())) {
return key;
}
}
return null;
}
private PluginConfig extractPluginConfig(final PluginLanguage pluginLanguage, final String pluginName, final String pluginVersion, final File pluginVersionDir, final boolean isVersionToStartLink) throws PluginConfigException {
final PluginConfig result;
Properties props = null;
try {
final File[] files = pluginVersionDir.listFiles();
if (files == null) {
throw new PluginConfigException("Unable to list files in " + pluginVersionDir.getAbsolutePath());
}
for (final File cur : files) {
if (cur.isFile() && cur.getName().equals(osgiConfig.getOSGIKillbillPropertyName())) {
props = readPluginConfigurationFile(cur);
}
if (props != null) {
break;
}
}
if (pluginLanguage == PluginLanguage.RUBY && props == null) {
throw new PluginConfigException("Invalid plugin configuration file for " + pluginName + "-" + pluginVersion);
}
} catch (final IOException e) {
throw new PluginConfigException("Failed to read property file for " + pluginName + "-" + pluginVersion, e);
}
final String pluginKey = findPluginKey(pluginName, pluginLanguage);
switch (pluginLanguage) {
case RUBY:
result = new DefaultPluginRubyConfig(pluginKey, pluginName, pluginVersion, pluginVersionDir, props, isVersionToStartLink, isPluginDisabled(pluginVersionDir));
break;
case JAVA:
result = new DefaultPluginJavaConfig(pluginKey, pluginName, pluginVersion, pluginVersionDir, (props == null) ? new Properties() : props, isVersionToStartLink, isPluginDisabled(pluginVersionDir));
break;
default:
throw new RuntimeException("Unknown plugin language " + pluginLanguage);
}
return result;
}
private boolean isPluginDisabled(final File pluginVersionDir) {
final File disabledFile = new File(pluginVersionDir + "/" + TMP_DIR_NAME + "/" + DISABLED_FILE_NAME);
return disabledFile.isFile();
}
private Properties readPluginConfigurationFile(final File config) throws IOException {
final Properties props = new Properties();
final BufferedReader br = new BufferedReader(new FileReader(config));
String line;
while ((line = br.readLine()) != null) {
final String[] parts = line.split("\\s*=\\s*");
final String key = parts[0];
final String value = parts[1];
props.put(key, value);
}
br.close();
return props;
}
}
