/* * Copyright 2015 Collective, Inc. * * 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.collective.celos.servlet; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; /** * This servlet is used in production to verify that the running instance * was started from the latest Git commit. */ @SuppressWarnings("serial") public class VersionServlet extends HttpServlet { protected void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException { try { final String serviceVersion = System.getenv("CELOS_VERSION"); if (serviceVersion != null) { res.getOutputStream().write(serviceVersion.getBytes()); } else { throw new Exception("CELOS_VERSION is undefined"); } } catch (Exception e) { throw new ServletException(e); } } }