/*
* 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);
}
}
}