| // Copyright (C) 2017 The Android Open Source Project |
| // |
| // 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.ericsson.gerrit.plugins.highavailability.peers.jgroups; |
| |
| import com.ericsson.gerrit.plugins.highavailability.Configuration; |
| import com.google.common.base.CharMatcher; |
| import com.google.common.flogger.FluentLogger; |
| import com.google.gerrit.server.config.GerritServerConfig; |
| import com.google.inject.Inject; |
| import com.google.inject.Provider; |
| import com.google.inject.ProvisionException; |
| import com.google.inject.Singleton; |
| import java.net.InetAddress; |
| import java.net.URISyntaxException; |
| import java.net.UnknownHostException; |
| import org.eclipse.jgit.lib.Config; |
| import org.eclipse.jgit.transport.URIish; |
| |
| @Singleton |
| class MyUrlProvider implements Provider<String> { |
| private static final FluentLogger log = FluentLogger.forEnclosingClass(); |
| |
| private static final String HTTPD_SECTION = "httpd"; |
| private static final String LISTEN_URL_KEY = "listenUrl"; |
| private static final String LISTEN_URL = HTTPD_SECTION + "." + LISTEN_URL_KEY; |
| private static final String PROXY_PREFIX = "proxy-"; |
| |
| private final String myUrl; |
| |
| @Inject |
| MyUrlProvider(@GerritServerConfig Config srvConfig, Configuration pluginConfiguration) { |
| String url = pluginConfiguration.peerInfoJGroups().myUrl(); |
| if (url == null) { |
| log.atInfo().log("myUrl not configured; attempting to determine from %s", LISTEN_URL); |
| try { |
| url = CharMatcher.is('/').trimTrailingFrom(getMyUrlFromListenUrl(srvConfig)); |
| } catch (MyUrlProviderException e) { |
| throw new ProvisionException(e.getMessage()); |
| } |
| } |
| this.myUrl = url; |
| } |
| |
| @Override |
| public String get() { |
| return myUrl; |
| } |
| |
| private static String getMyUrlFromListenUrl(Config srvConfig) throws MyUrlProviderException { |
| String[] listenUrls = srvConfig.getStringList(HTTPD_SECTION, null, LISTEN_URL_KEY); |
| if (listenUrls.length != 1) { |
| throw new MyUrlProviderException( |
| String.format( |
| "Can only determine myUrl from %s when there is exactly 1 value configured; found %d", |
| LISTEN_URL, listenUrls.length)); |
| } |
| String url = listenUrls[0]; |
| if (url.startsWith(PROXY_PREFIX)) { |
| throw new MyUrlProviderException( |
| String.format( |
| "Cannot determine myUrl from %s when configured as reverse-proxy: %s", |
| LISTEN_URL, url)); |
| } |
| if (url.contains("*")) { |
| throw new MyUrlProviderException( |
| String.format( |
| "Cannot determine myUrl from %s when configured with wildcard: %s", LISTEN_URL, url)); |
| } |
| try { |
| URIish u = new URIish(url); |
| return u.setHost(InetAddress.getLocalHost().getHostName()).toString(); |
| } catch (URISyntaxException | UnknownHostException e) { |
| throw new MyUrlProviderException( |
| String.format( |
| "Unable to determine myUrl from %s value [%s]: %s", LISTEN_URL, url, e.getMessage())); |
| } |
| } |
| |
| private static class MyUrlProviderException extends Exception { |
| private static final long serialVersionUID = 1L; |
| |
| MyUrlProviderException(String message) { |
| super(message); |
| } |
| } |
| } |