databank-extension/scripts/plog.js

!function(e){"object"==typeof exports?module.exports=e():"function"==typeof define&&define.amd?define(e):"undefined"!=typeof window?window.plog=e():"undefined"!=typeof global?global.plog=e():"undefined"!=typeof self&&(self.plog=e())}(function(){var define,module,exports;return (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);throw new Error("Cannot find module '"+o+"'")}var f=n[o]={exports:{}};t[o][0].call(f.exports,function(e){var n=t[o][1][e];return s(n?n:e)},f,f.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
    var InMemoryStorage = function() {
      this.events = [];
    };
    
    InMemoryStorage.prototype.append = function(event) {
      this.events.push(event);
    };
    
    InMemoryStorage.prototype.clear = function() {
      this.events = [];
    };
    
    InMemoryStorage.prototype.getEvents = function() {
      return this.events;
    };
    
    module.exports = InMemoryStorage;
    },{}],2:[function(require,module,exports){
    var INDEX_KEY = 'plog-index';
    
    function initialize() {
      saveIndex({firstId: 0, nextId: 0});
    }
    
    function saveIndex(index) {
      localStorage[INDEX_KEY] = JSON.stringify(index);
    }
    
    function loadIndex() {
      return JSON.parse(localStorage[INDEX_KEY]);
    }
    
    function foreachKey(callback) {
      var index = loadIndex();
      for (var id = index.firstId; id < index.nextId; id++) {
        callback('plog-event-' + id);
      }
    }
    
    var LocalStorage = function(opts) {
      opts = opts || {};
      this.maxSize = opts.maxSize || 100;
    
      if (typeof localStorage[INDEX_KEY] === 'undefined') {
        initialize();
      }
    };
    
    LocalStorage.prototype.clear = function() {
      foreachKey(function(key) {
        delete localStorage[key];
      });
      initialize();
    };
    
    LocalStorage.prototype.purgeOldEvents = function() {
      var eventsToPurge = Math.round(this.maxSize * 0.2);
      var index = loadIndex();
    
      for (var i = 0; i < eventsToPurge; i++) {
        var key = 'plog-event-' + (index.firstId + i);
        delete localStorage[key];
      }
    
      index.firstId += eventsToPurge;
      saveIndex(index);
    };
    
    LocalStorage.prototype.getEvents = function() {
      var events = [];
      foreachKey(function(key) {
        var event = localStorage[key];
        events.push(JSON.parse(event));
      });
      return events;
    };
    
    LocalStorage.prototype.append = function(event) {
    
      var index = loadIndex();
      var currentSize = index.nextId - index.firstId;
    
      if (currentSize + 1 > this.maxSize) {
        this.purgeOldEvents();
        index = loadIndex();
      }
        
      var key = 'plog-event-' + index.nextId;
      localStorage[key] = JSON.stringify(event);
    
      index.nextId++;
      saveIndex(index);
    };
    
    module.exports = LocalStorage;
    },{}],3:[function(require,module,exports){
    var plog = {};
    
    plog.storages = {
      LocalStorage: require('./LocalStorage'),
      InMemoryStorage: require('./InMemoryStorage')
    };
    
    plog.level = {
      DEBUG: 0,
      INFO: 1,
      WARN: 2,
      ERROR: 3,
      FATAL: 4,
      getName: function(level) {
        for (var x in this) {
          if (this[x] === level) return x;
        }
        return level;
      }
    };
    
    var currentStorage, currentLevel;
    
    plog.reset = function() {
      currentStorage = new plog.storages.LocalStorage();
      currentLevel = plog.level.INFO;
    };
    
    plog.reset();
    
    plog.useStorage = function(storage) {
      currentStorage = storage;
    };
    
    plog.getStorage = function() {
      return currentStorage;
    };
    
    plog.getLevel = function() {
      return currentLevel;
    };
    
    plog.setLevel = function(level) {
      currentLevel = level;
    };
    
    function write(level, msg) {
      if (level < currentLevel) return;
    
      var event = {
        level: level,
        date: new Date(),
        message: msg
      };
    
      currentStorage.append(event);
    
      console.log(event.date.toISOString() + ': ' + plog.level.getName(level) + ': ' + event.message);
    }
    
    function createWriteFunc(level) {
      return function(msg) {
        write(level, msg);
      };
    }
    
    for (var levelName in plog.level) {
      if (plog.level.hasOwnProperty(levelName)) {
        plog[levelName.toLowerCase()] = createWriteFunc(plog.level[levelName]);
      }
    }
    
    module.exports = plog;
    },{"./InMemoryStorage":1,"./LocalStorage":2}]},{},[3])
    (3)
    });