React-redux action is returning before async action is complete - react-native

Question

I have a React Native app using redux and I'd like my action to set the GPS coordinates so I have them available in the store. You can see my console logs in the code, and 'action returning' is logged before 'has coordinates', which is the problem.
Component:
<TouchableOpacity style={{flex:1}} onPress={() => {
this.props.setLocation();
}}>
Action.js
export function setLocation(){
let coords = {
latitude:0,
longitude:0,
navigatorError:''
};
navigator.geolocation.getCurrentPosition(
(position) => {
console.log('has coordinates');
coords['latitude'] = position.coords.latitude
coords['longitude'] = position.coords.longitude
coords['navigatorError'] = null
},
(error) => coords['navigatorError'] = error.message,
{ enableHighAccuracy: true, timeout: 20000, maximumAge: 1000 },
);
console.log('action returning');
return {
type: 'set_location',
payload: coords
};
};
Reducer.js
export default (state = null, action) => {
switch(action.type){
case 'set_location':
return action.payload;
default:
return state;
}
}
Note: I'm not actually using redux-thunk in this project, I'm not sure if it's appropriate for what I need here.

Answer 1

You can use async and await to accomplish this. Basically, you need to await the coords to be returned from your asynchronous call.
Something like this:
export async function setLocation(){
let coords = {
latitude:0,
longitude:0,
navigatorError:''
};
await navigator.geolocation.getCurrentPosition(
(position) => {
console.log('has coordinates');
coords['latitude'] = position.coords.latitude
coords['longitude'] = position.coords.longitude
coords['navigatorError'] = null
},
(error) => coords['navigatorError'] = error.message,
{ enableHighAccuracy: true, timeout: 20000, maximumAge: 1000 },
);
console.log('action returning');
return {
type: 'set_location',
payload: coords
};
};
Documentation on async/await can be found here.