Clear the app data if disconnected from internet for more then 5min in react native - react-native

Question

I want to clear the react native app data if my app is disconnected from internet for more than 5 min.
I am using react native NetInfo to check network connectivity status.
Saving the time when app disconnected and checking when it will reconnect to internet.
If interval is more than 5 min then I want to clear the app data.
My Code is:
class OfflineMessage extends PureComponent {
constructor(props) {
super(props);
this.state = {
isConnected: true
};
}
componentDidMount() {
NetInfo.addEventListener((state) => {
this.handleConnection(state.isConnected);
});
}
componentWillUnmount() {
NetInfo.removeEventListener((state) => {
this.handleConnection(state.isConnected);
});
}
handleConnection = (isConnected) => {
this.setState({ isConnected });
if(!isConnected){
this.startTimer();
} else {
this.checkElapsed();
}
};
startTimer = async () => {
try {
console.log('Internet disconnected at: ');
await AsyncStorage.setItem('time', JSON.stringify(Date.now()));
} catch (error) {
// console.log('Something went wrong', error);
}
}
checkElapsed = async () => {
try {
let startTime = await AsyncStorage.getItem('time');
if(startTime){
let endTime = Date.now();
const elapsedTime = Math.floor((endTime -JSON.parse(startTime))/1000);
if(elapsedTime > 5){
alert("5 min is completed.");
// Clear app data
}
console.log('Time elapsed'+ elapsedTime);
}
} catch (error) {
// console.log('Something went wrong', error);
}
}
Problem:
Both the methods startTimer and checkElapsed called whenever connectivity status changes.
What is wrong with this code.
if I modify given code as :
state = {
isConnected: true
};
componentDidMount() {
this.unsubscribeFromNetInfo = NetInfo.addEventListener((state) => {
this.handleConnection(state.isConnected);
});
}
componentWillUnmount() {
this.unsubscribeFromNetInfo();
}
handleConnection = (isConnected) => {
console.log(isConnected);
this.setState({ isConnected });
};
EventListener called multiple times and status changes frequently true false,true,false .

Answer 1

Now, you are handling the NetInfo subscription wrong, according to https://github.com/react-native-community/react-native-netinfo#usage
You would have to do:
componentDidMount() {
this.unsubscribeFromNetInfo = NetInfo.addEventListener(state => {
this.handleConnection(state.isConnected);
});
}
componentWillUnmount() {
this.unsubscribeFromNetInfo();
}
Also, if you want to check for 5 minutes use:
if (elapsedTime > 5 * 60)
as your conversion
Math.floor((endTime - JSON.parse(startTime)) / 1000)
converts it to seconds not minutes.
In the current state, your app will trigger almost everything as the code only checks for 5 seconds.
Otherwise, the logic that you implemented itself should be working :)