javascript-sdk/src/cache.js at master · leancloud/javascript-sdk · GitHub

38 lines (34 loc) · 905 Bytes

const storage = require('./localstorage');

const AV = require('./av');

const removeAsync = (exports.removeAsync = storage.removeItemAsync.bind(

storage

));

const getCacheData = (cacheData, key) => {

try {

cacheData = JSON.parse(cacheData);

} catch (e) {

return null;

}

if (cacheData) {

const expired = cacheData.expiredAt && cacheData.expiredAt < Date.now();

if (!expired) {

return cacheData.value;

}

return removeAsync(key).then(() => null);

}

return null;

};

exports.getAsync = key => {

key = `AV/${AV.applicationId}/${key}`;

return storage.getItemAsync(key).then(cache => getCacheData(cache, key));

};

exports.setAsync = (key, value, ttl) => {

const cache = { value };

if (typeof ttl === 'number') {

cache.expiredAt = Date.now() + ttl;

}

return storage.setItemAsync(

`AV/${AV.applicationId}/${key}`,

JSON.stringify(cache)

);

};

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