react-native-sync-localstorage code example
Example: react-native-sync-localstorage expire date
/**
*
* @param urlAsKey
* @param expireInMinutes
* @returns {Promise.<*>}
*/
async getCachedUrlContent(urlAsKey, expireInMinutes = 60) {
let data = null;
await AsyncStorage.getItem(urlAsKey, async (err, value) => {
data = (JSON.parse(value));
// there is data in cache && cache is expired
if (data !== null && data['expireAt'] &&
new Date(data.expireAt) < (new Date())) {
//clear cache
AsyncStorage.removeItem(urlAsKey);
//update res to be null
data = null;
} else {
console.log('read data from cache ');
}
});
//update cache + set expire at date
if (data === null) {
console.log('cache new Date ');
//fetch data
data = fetch(urlAsKey).then((response) => response.json())
.then(apiRes => {
//set expire at
apiRes.expireAt = this.getExpireDate(expireInMinutes);
//stringify object
const objectToStore = JSON.stringify(apiRes);
//store object
AsyncStorage.setItem(urlAsKey, objectToStore);
console.log(apiRes.expireAt);
return apiRes;
});
}
return data;
},
/**
*
* @param expireInMinutes
* @returns {Date}
*/
getExpireDate(expireInMinutes) {
const now = new Date();
let expireTime = new Date(now);
expireTime.setMinutes(now.getMinutes() + expireInMinutes);
return expireTime;
}