51 lines
1.6 KiB
TypeScript
51 lines
1.6 KiB
TypeScript
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import AsyncStorage from '@react-native-async-storage/async-storage';
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import { DocumentDirectoryPath, exists, readFile, writeFile, unlink, mkdir } from 'react-native-fs';
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import { Storage } from 'redux-persist';
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const STORAGE_BASE_PATH = DocumentDirectoryPath + '/store/';
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/** Retrieve the path of a store file for a given key */
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function getFileByKey(key: string) {
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return STORAGE_BASE_PATH + encodeURIComponent(key) + '.json';
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}
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/** Ensure that the store directory exists on the local filesystem */
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async function ensureDirectoryExists() {
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if (!(await exists(STORAGE_BASE_PATH))) {
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await mkdir(STORAGE_BASE_PATH);
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}
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}
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/**
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* Migrates the Redux store from AsyncStorage to react-native-fs.
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*/
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const MigratedStorage: Storage = {
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async getItem(key) {
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const path = getFileByKey(key);
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// GUARD: Check whether a store already exists on the filesystem
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if (await exists(path)) {
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// In which case, we'll read it from disk
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return readFile(path);
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} else {
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// If not, attempt to read the previous store from AsyncStorage
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const oldStore = await AsyncStorage.getItem(key);
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// GUARD: If it exists, migrate it to a file on the filesystem
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if (oldStore) {
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await ensureDirectoryExists();
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await writeFile(path, oldStore);
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return oldStore;
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}
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}
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},
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removeItem(key) {
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return unlink(getFileByKey(key));
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},
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async setItem(key, value) {
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await ensureDirectoryExists();
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return writeFile(getFileByKey(key), value);
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},
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};
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export default MigratedStorage;
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