leancloud-storage/dist/node/cache.js

LeanCloud JavaScript SDK.

'use strict';

var storage = require('./localstorage');
var AV = require('./av');

var removeAsync = exports.removeAsync = storage.removeItemAsync.bind(storage);

var getCacheData = function getCacheData(cacheData, key) {
  try {
    cacheData = JSON.parse(cacheData);
  } catch (e) {
    return null;
  }
  if (cacheData) {
    var expired = cacheData.expiredAt && cacheData.expiredAt < Date.now();
    if (!expired) {
      return cacheData.value;
    }
    return removeAsync(key).then(function () {
      return null;
    });
  }
  return null;
};

exports.getAsync = function (key) {
  key = AV.applicationId + '/' + key;
  return storage.getItemAsync(key).then(function (cache) {
    return getCacheData(cache, key);
  });
};

exports.setAsync = function (key, value, ttl) {
  var cache = { value: value };
  if (typeof ttl === 'number') {
    cache.expiredAt = Date.now() + ttl;
  }
  return storage.setItemAsync(AV.applicationId + '/' + key, JSON.stringify(cache));
};