com.logsniffer.app.StartupAppConfig.java Source code

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Here is the source code for com.logsniffer.app.StartupAppConfig.java

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/*******************************************************************************
 * logsniffer, open source tool for viewing, monitoring and analysing log data.
 * Copyright (c) 2015 Scaleborn UG, www.scaleborn.com
 *
 * logsniffer is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * logsniffer is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *******************************************************************************/
package com.logsniffer.app;

import java.io.File;
import java.io.FileOutputStream;
import java.util.Properties;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

/**
 * App config for startup routines.
 * 
 * @author mbok
 * 
 */
@Configuration
public class StartupAppConfig {
    private Logger logger = LoggerFactory.getLogger(getClass());

    @Value("${logsniffer.home}")
    private String logSnifferHomeDir;

    @Value("${logsniffer.version}")
    private String version;

    /**
     * Checks the home dir under ${logsniffer.home} for write access, creates it
     * if necessary and writes a template config.properties.
     * 
     * @return home directory representation
     * @throws Exception
     */
    @Bean
    public LogSnifferHome homeDir() throws Exception {
        File logSnifferHomeDirFile = new File(logSnifferHomeDir);
        logger.info("Starting Logsniffer {} with home directory {}", version, logSnifferHomeDirFile.getPath());
        if (!logSnifferHomeDirFile.exists()) {
            logger.info("Home directory is't present, going to create it");
            try {
                logSnifferHomeDirFile.mkdirs();
            } catch (Exception e) {
                logger.error("Failed to create home directory \"" + logSnifferHomeDirFile.getPath()
                        + "\". Logsniffer can't operate without a write enabled home directory. Please create the home directory manually and grant the user Logsniffer is running as the write access.",
                        e);
                throw e;
            }
        } else if (!logSnifferHomeDirFile.canWrite()) {
            logger.error(
                    "Configured home directory \"{}\" isn't write enabled. Logsniffer can't operate without a write enabled home directory. Please grant the user Logsniffer is running as the write access.",
                    logSnifferHomeDirFile.getPath());
            throw new SecurityException(
                    "Configured home directory \"" + logSnifferHomeDirFile.getPath() + "\" isn't write enabled.");
        }
        File homeConfigProps = new File(logSnifferHomeDirFile, "config.properties");
        if (!homeConfigProps.exists()) {
            FileOutputStream fo = new FileOutputStream(homeConfigProps);
            try {
                new Properties().store(fo, "Place here Logsniffer settings");
            } finally {
                fo.close();
            }
        }

        return new LogSnifferHome() {
            @Override
            public File getHomeDir() {
                return new File(logSnifferHomeDir);
            }
        };
    }
}