GoogleAppScript - Logger

GoogleAppScriptLogger.gs

/**
 * LOG
 *
 * Basic HTTP logger.
 */
var Logger = function() {
  var _LEVELS = {
      DEBUG: 1,
      INFO: 2,
      ERROR: 3
  }
  
  /**
   * Get Logger instance
   *
   * @param {string} appId      Application ID that will be attached to each log line.
   * @param {string} serviceUrl Your service url. Supports basic auth: http(s)://user:pass@mydomain.com/log.
   */
  var _getLogger = function (appId, serviceUrl) {
    if(!appId || !serviceUrl) {
      throw 'Invalid parameters: cannot initialize Log without appId and serviceUrl';
    }
    
    var _enabled = true; // Will actually do logging or not. Currently all or nothing switch. Future may bring levels.
    var _level   = _LEVELS.INFO; // Level >= that will be logged.
    
    var basicAuthRegexp      = /(http(s)?:)\/\/(\w*):(\w*)@(.*)/;
    var basicAuthCredentials = basicAuthRegexp.exec(serviceUrl);
    var _headers = {
      'User-Agent': 'Google Script Logger Library',
      'Content-Type': 'application/json'
    };
    
    if (basicAuthCredentials && basicAuthCredentials.length >= 4) {
      var username = basicAuthCredentials[3];
      var password = basicAuthCredentials[4];
      serviceUrl = basicAuthCredentials[1] + basicAuthCredentials[5]; //protocol + url
      
      _headers['Authorization'] = 'Basic ' + Utilities.base64Encode(username + ':' + password); 
    }
    
    var _setEnabled = function (isLogging) {
      if(typeof isLogging !== 'boolean') {
        return;
      }
      _enabled = isLogging;
    }
    
    var _setLevel = function(level) {
      _level = level;
    };
    
    /**
     * Translate level ID to String value.
     *
     * @param {integer} Integer value of level
     *
     * @return {string} String value of level
     */
    var _getLevelByValue = function(value) {
      if(!value) return;
      
      for(var key in _LEVELS) {
        if(_LEVELS[key] == value) {
          return key;
        }
      }
    };
    
    var _debug = function() {
      _log(_LEVELS.DEBUG, arguments);
    };
    
    var _info = function() {
      _log(_LEVELS.INFO, arguments);  
    };
    
    var _error = function() {
      _log(_LEVELS.ERROR, arguments);
    }
    
    var _log = function(level, msgs) {
      if (!_enabled || level < _level) return;
      
      var data = [];
      Object.keys(msgs).forEach(function(key) {
        data.push(msgs[key]);
      });
      
      var payload = {
        level: _getLevelByValue(level),
        appId: appId.trim(),
        data: data
      }
      
      var options = {
        method: 'post',
        payload: JSON.stringify(payload),
        headers: _headers
      };
      
      var response = UrlFetchApp.fetch(serviceUrl, options); 
    };
    
    return {
      debug: _debug,
      info: _info,
      error: _error,
      setEnabled: _setEnabled,
      setLevel: _setLevel
    }    
  }
  return {
    getLogger: _getLogger,
    LEVEL: _LEVELS
  }
}();

function test_() {
  var serviceUrl = 'https://webhook.logentries.com/noformat/logs/YOUR_LOGENTRIES_TOKEN_HERE';
  var Log = Logger.getLogger('Lib.Log.test_', serviceUrl);
  var Log2 = Logger.getLogger('Lib.Log2.test_', serviceUrl);
  
  Log.debug('DEBUG');
  Log.info('INFO');
  Log.error('ERROR')
  
  Log.setEnabled(false);
  Log.info('DEBUG - Should not log');
  
  Log.setEnabled(true);
  Log.info('DEBUG - Should log');
  
  Log.setLevel(Logger.LEVEL.DEBUG);
  Log.debug('DEBUG - Should log due to logger level');
  
  Log.setLevel(Logger.LEVEL.ERROR);  
  Log.debug('DEBUG - Should not log');
  Log.info('INFO - Should not log');
  Log.error('ERROR - SHOULD log');
  
  Log2.info('INFO - should log');
  
  Log2.info('INFO - one hell of a long message one hell of a long message one hell of a long message one hell of a long message one hell of a long message one hell of a long message' + 
            'one hell of a long message one hell of a long message one hell of a long message one hell of a long message one hell of a long message one hell of a long message' +
            'one hell of a long message one hell of a long message one hell of a long message one hell of a long message one hell of a long message one hell of a long message' +
            'one hell of a long message one hell of a long message one hell of a long message one hell of a long message one hell of a long message one hell of a long message' +
            'one hell of a long message one hell of a long message one hell of a long message one hell of a long message one hell of a long message one hell of a long message' +
            'one hell of a long message one hell of a long message one hell of a long message one hell of a long message one hell of a long message one hell of a long message' +
            'one hell of a long message one hell of a long message one hell of a long message one hell of a long message one hell of a long message one hell of a long message' +
            'one hell of a long message one hell of a long message one hell of a long message one hell of a long message one hell of a long message one hell of a long message' +
            'one hell of a long message one hell of a long message one hell of a long message one hell of a long message one hell of a long message one hell of a long message' +
            'one hell of a long message one hell of a long message one hell of a long message one hell of a long message one hell of a long message one hell of a long message' +
            'one hell of a long message one hell of a long message one hell of a long message one hell of a long message one hell of a long message one hell of a long message' +
            'one hell of a long message one hell of a long message one hell of a long message one hell of a long message one hell of a long message one hell of a long message' +
            'one hell of a long message one hell of a long message one hell of a long message one hell of a long message one hell of a long message one hell of a long message' +
            'one hell of a long message one hell of a long message one hell of a long message one hell of a long message one hell of a long message one hell of a long message' +
            'one hell of a long message one hell of a long message one hell of a long message one hell of a long message one hell of a long message one hell of a long message' +
            'one hell of a long message one hell of a long message one hell of a long message one hell of a long message one hell of a long message one hell of a long message' +
            'one hell of a long message one hell of a long message one hell of a long message one hell of a long message one hell of a long message one hell of a long message' +
            'one hell of a long message one hell of a long message one hell of a long message one hell of a long message one hell of a long message one hell of a long message' +
            'one hell of a long message one hell of a long message one hell of a long message one hell of a long message one hell of a long message one hell of a long message' +
            'one hell of a long message one hell of a long message one hell of a long message one hell of a long message one hell of a long message one hell of a long message'
           );
  Log2.info('INFO - multidim array', [['a',3],['asd',1]], {a: 'a', c: 'c', d: 'd'});
}