| // 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.health; |
| |
| import static javax.servlet.http.HttpServletResponse.SC_FORBIDDEN; |
| import static javax.servlet.http.HttpServletResponse.SC_INTERNAL_SERVER_ERROR; |
| import static javax.servlet.http.HttpServletResponse.SC_NO_CONTENT; |
| import static javax.servlet.http.HttpServletResponse.SC_SERVICE_UNAVAILABLE; |
| |
| import com.google.gerrit.extensions.annotations.PluginData; |
| import com.google.gerrit.server.CurrentUser; |
| import com.google.inject.Inject; |
| import com.google.inject.Provider; |
| import com.google.inject.Singleton; |
| import java.io.File; |
| import java.io.IOException; |
| import java.nio.file.Files; |
| import java.nio.file.Path; |
| import java.nio.file.StandardOpenOption; |
| import javax.servlet.http.HttpServlet; |
| import javax.servlet.http.HttpServletRequest; |
| import javax.servlet.http.HttpServletResponse; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| @Singleton |
| public class HealthServlet extends HttpServlet { |
| private static final Logger log = LoggerFactory.getLogger(HealthServlet.class); |
| private static final long serialVersionUID = -1L; |
| |
| private final Provider<CurrentUser> currentUserProvider; |
| private final File unhealthyFile; |
| |
| @Inject |
| HealthServlet(Provider<CurrentUser> currentUserProvider, @PluginData Path pluginDataDir) { |
| this.currentUserProvider = currentUserProvider; |
| this.unhealthyFile = pluginDataDir.resolve("unhealthy.txt").toFile(); |
| } |
| |
| @Override |
| protected void doPost(HttpServletRequest req, HttpServletResponse rsp) { |
| if (!currentUserProvider.get().getCapabilities().canAdministrateServer()) { |
| sendError(rsp, SC_FORBIDDEN); |
| return; |
| } |
| try { |
| setHealthy(); |
| rsp.setStatus(SC_NO_CONTENT); |
| } catch (IOException e) { |
| log.error("Failed to set healthy", e); |
| sendError(rsp, SC_INTERNAL_SERVER_ERROR); |
| } |
| } |
| |
| @Override |
| protected void doDelete(HttpServletRequest req, HttpServletResponse rsp) { |
| if (!currentUserProvider.get().getCapabilities().canAdministrateServer()) { |
| sendError(rsp, SC_FORBIDDEN); |
| return; |
| } |
| try { |
| setUnhealthy(); |
| rsp.setStatus(SC_NO_CONTENT); |
| } catch (IOException e) { |
| log.error("Failed to set unhealthy", e); |
| sendError(rsp, SC_INTERNAL_SERVER_ERROR); |
| } |
| } |
| |
| @Override |
| protected void doGet(HttpServletRequest req, HttpServletResponse rsp) { |
| if (unhealthyFile.exists()) { |
| sendError(rsp, SC_SERVICE_UNAVAILABLE); |
| return; |
| } |
| rsp.setStatus(SC_NO_CONTENT); |
| } |
| |
| private static void sendError(HttpServletResponse rsp, int statusCode) { |
| try { |
| rsp.sendError(statusCode); |
| } catch (IOException e) { |
| rsp.setStatus(SC_INTERNAL_SERVER_ERROR); |
| log.error("Failed to send error response", e); |
| } |
| } |
| |
| private void setHealthy() throws IOException { |
| if (unhealthyFile.exists()) { |
| Files.delete(unhealthyFile.toPath()); |
| } |
| } |
| |
| private void setUnhealthy() throws IOException { |
| if (!unhealthyFile.exists()) { |
| Files.newOutputStream(unhealthyFile.toPath(), StandardOpenOption.CREATE).close(); |
| } |
| } |
| } |