exports.logrotator = {
  enable: true,
  package: 'egg-logrotator',
};

// if any files need rotate by file size, config here
exports.logrotator = {
  filesRotateByHour: [],           // list of files that will be rotated by hour
  hourDelimiter: '-',              // rotate the file by hour use specified delimiter
  filesRotateBySize: [],           // list of files that will be rotated by size
  maxFileSize: 50 * 1024 * 1024,   // Max file size to judge if any file need rotate
  maxFiles: 10,                    // pieces rotate by size
  rotateDuration: 60000,           // time interval to judge if any file need rotate
  maxDays: 31,                     // keep max days log files, default is `31`. Set `0` to keep all logs
};

// app/schedule/custom.js
module.exports = app => {
  const rotator = getRotator(app);
  return {
    // https://github.com/eggjs/egg-schedule
    schedule: {
      type: 'worker', // only one worker run this task
      cron: '10 * * * *', // custom cron, or use interval
    },
    async task() {
      await rotator.rotate();
    }
  };
};

function getRotator(app) {
  class CustomRotator extends app.LogRotator {
    // return map that contains a pair of srcPath and targetPath
    // LogRotator will rename ksrcPath to targetPath
    async getRotateFiles() {
      const files = new Map();
      const srcPath = '/home/admin/foo.log';
      const targetPath = '/home/admin/foo.log.2016.09.30';
      files.set(srcPath, { srcPath, targetPath });
      return files;
    }
  }
  return new CustomRotator({ app });
}