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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,102 @@ | ||
| import NetInfo, { NetInfoConfiguration } from '@react-native-community/netinfo'; | ||
| import { removeFromArray } from '@standardnotes/snjs'; | ||
| import React, { useEffect, useState } from 'react'; | ||
|
|
||
| export const useIsOffline = () => { | ||
| const networkService = React.useContext(NetworkServiceContext); | ||
| const [isOffline, setIsOffline] = useState(false); | ||
|
|
||
| useEffect(() => { | ||
| const removeOfflineObserver = networkService!.addNetworkChangeObserver( | ||
| networkState => | ||
| setIsOffline( | ||
| !networkState.isConnected || !networkState.isInternetReachable | ||
| ) | ||
| ); | ||
|
|
||
| return () => { | ||
| removeOfflineObserver && removeOfflineObserver(); | ||
| }; | ||
| }, [networkService]); | ||
|
|
||
| return [isOffline]; | ||
| }; | ||
|
|
||
| export const NetworkServiceContext = React.createContext< | ||
| NetworkService | undefined | ||
| >(undefined); | ||
|
|
||
| type NetworkState = { | ||
| /** | ||
| * If there is an active network connection. If unknown defaults to null. | ||
| */ | ||
| isConnected: boolean | null; | ||
| /** | ||
| * If the internet is reachable with the currently active network connection. | ||
| * If unknown defaults to null. | ||
| */ | ||
| isInternetReachable: boolean | null; | ||
| }; | ||
|
|
||
| type NetworkChangeObserver = ( | ||
| networkState: NetworkState | ||
| ) => Promise<void> | void; | ||
|
|
||
| export class NetworkService { | ||
| private observers: NetworkChangeObserver[] = []; | ||
| private removeNetworkChangeListener?: () => void; | ||
|
|
||
| constructor(configuration?: NetInfoConfiguration) { | ||
| if (configuration) { | ||
| NetInfo.configure({ | ||
| ...configuration, | ||
| }); | ||
| } | ||
| } | ||
|
|
||
| deinit() { | ||
| if (this.removeNetworkChangeListener) { | ||
| this.removeNetworkChangeListener(); | ||
| this.removeNetworkChangeListener = undefined; | ||
| } | ||
| this.observers.length = 0; | ||
| } | ||
|
|
||
| async registerObservers() { | ||
| this.removeNetworkChangeListener = NetInfo.addEventListener( | ||
| ({ isConnected, isInternetReachable }) => { | ||
| this.notifyObserversOfNetworkChange({ | ||
| isConnected, | ||
| isInternetReachable, | ||
| }); | ||
| } | ||
| ); | ||
| } | ||
|
|
||
| /** | ||
| * Registers an observer for network change | ||
| * @returns function that unregisters this observer | ||
| */ | ||
| public addNetworkChangeObserver(callback: NetworkChangeObserver) { | ||
| // Sets initial values. | ||
| NetInfo.fetch().then(({ isConnected, isInternetReachable }) => { | ||
| callback({ | ||
| isConnected, | ||
| isInternetReachable, | ||
| }); | ||
| }); | ||
|
|
||
| // Execute callback on subsequent network state changes. | ||
| this.observers.push(callback); | ||
|
|
||
| return () => { | ||
| removeFromArray(this.observers, callback); | ||
| }; | ||
| } | ||
|
|
||
| private notifyObserversOfNetworkChange(networkState: NetworkState) { | ||
| for (const observer of this.observers) { | ||
| observer(networkState); | ||
| } | ||
| } | ||
| } |
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