react-native/Libraries/Storage/AsyncStorage.ios.js

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/**
* Copyright (c) 2015-present, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of this source tree. An additional grant
* of patent rights can be found in the PATENTS file in the same directory.
*
* @providesModule AsyncStorage
* @flow-weak
*/
'use strict';
var NativeModules = require('NativeModules');
var RCTAsyncLocalStorage = NativeModules.AsyncLocalStorage;
var RCTAsyncRocksDBStorage = NativeModules.AsyncRocksDBStorage;
// We use RocksDB if available.
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var RCTAsyncStorage = RCTAsyncRocksDBStorage || RCTAsyncLocalStorage;
/**
* AsyncStorage is a simple, asynchronous, persistent, global, key-value storage
* system. It should be used instead of LocalStorage.
*
* It is recommended that you use an abstraction on top of AsyncStorage instead
* of AsyncStorage directly for anything more than light usage since it
* operates globally.
*
* This JS code is a simple facad over the native iOS implementation to provide
* a clear JS API, real Error objects, and simple non-multi functions.
*/
var AsyncStorage = {
/**
* Fetches `key` and passes the result to `callback`, along with an `Error` if
* there is any.
*/
getItem: function(
key: string,
callback: (error: ?Error, result: ?string) => void
): void {
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RCTAsyncStorage.multiGet([key], function(errors, result) {
// Unpack result to get value from [[key,value]]
var value = (result && result[0] && result[0][1]) ? result[0][1] : null;
callback((errors && convertError(errors[0])) || null, value);
});
},
/**
* Sets `value` for `key` and calls `callback` on completion, along with an
* `Error` if there is any.
*/
setItem: function(
key: string,
value: string,
callback: ?(error: ?Error) => void
): void {
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RCTAsyncStorage.multiSet([[key,value]], function(errors) {
callback && callback((errors && convertError(errors[0])) || null);
});
},
removeItem: function(
key: string,
callback: ?(error: ?Error) => void
): void {
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RCTAsyncStorage.multiRemove([key], function(errors) {
callback && callback((errors && convertError(errors[0])) || null);
});
},
/**
* Merges existing value with input value, assuming they are stringified json.
*
* Not supported by all native implementations.
*/
mergeItem: function(
key: string,
value: string,
callback: ?(error: ?Error) => void
): void {
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RCTAsyncStorage.multiMerge([[key,value]], function(errors) {
callback && callback((errors && convertError(errors[0])) || null);
});
},
/**
* Erases *all* AsyncStorage for all clients, libraries, etc. You probably
* don't want to call this - use removeItem or multiRemove to clear only your
* own keys instead.
*/
clear: function(callback: ?(error: ?Error) => void) {
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RCTAsyncStorage.clear(function(error) {
callback && callback(convertError(error));
});
},
/**
* Gets *all* keys known to the system, for all callers, libraries, etc.
*/
getAllKeys: function(callback: (error: ?Error) => void) {
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RCTAsyncStorage.getAllKeys(function(error, keys) {
callback(convertError(error), keys);
});
},
/**
* The following batched functions are useful for executing a lot of
* operations at once, allowing for native optimizations and provide the
* convenience of a single callback after all operations are complete.
*
* These functions return arrays of errors, potentially one for every key.
* For key-specific errors, the Error object will have a key property to
* indicate which key caused the error.
*/
/**
* multiGet invokes callback with an array of key-value pair arrays that
* matches the input format of multiSet.
*
* multiGet(['k1', 'k2'], cb) -> cb([['k1', 'val1'], ['k2', 'val2']])
*/
multiGet: function(
keys: Array<string>,
callback: (errors: ?Array<Error>, result: ?Array<Array<string>>) => void
): void {
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RCTAsyncStorage.multiGet(keys, function(errors, result) {
callback(
(errors && errors.map((error) => convertError(error))) || null,
result
);
});
},
/**
* multiSet and multiMerge take arrays of key-value array pairs that match
* the output of multiGet, e.g.
*
* multiSet([['k1', 'val1'], ['k2', 'val2']], cb);
*/
multiSet: function(
keyValuePairs: Array<Array<string>>,
callback: ?(errors: ?Array<Error>) => void
): void {
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RCTAsyncStorage.multiSet(keyValuePairs, function(errors) {
callback && callback(
(errors && errors.map((error) => convertError(error))) || null
);
});
},
/**
* Delete all the keys in the `keys` array.
*/
multiRemove: function(
keys: Array<string>,
callback: ?(errors: ?Array<Error>) => void
): void {
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RCTAsyncStorage.multiRemove(keys, function(errors) {
callback && callback(
(errors && errors.map((error) => convertError(error))) || null
);
});
},
/**
* Merges existing values with input values, assuming they are stringified
* json.
*
* Not supported by all native implementations.
*/
multiMerge: function(
keyValuePairs: Array<Array<string>>,
callback: ?(errors: ?Array<Error>) => void
): void {
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RCTAsyncStorage.multiMerge(keyValuePairs, function(errors) {
callback && callback(
(errors && errors.map((error) => convertError(error))) || null
);
});
},
};
// Not all native implementations support merge.
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if (!RCTAsyncStorage.multiMerge) {
delete AsyncStorage.mergeItem;
delete AsyncStorage.multiMerge;
}
function convertError(error) {
if (!error) {
return null;
}
var out = new Error(error.message);
out.key = error.key; // flow doesn't like this :(
return out;
}
module.exports = AsyncStorage;