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react-native/React/Modules/RCTAsyncLocalStorage.m

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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.
*/
#import "RCTAsyncLocalStorage.h"
#import <Foundation/Foundation.h>
#import <CommonCrypto/CommonCryptor.h>
#import <CommonCrypto/CommonDigest.h>
#import "RCTConvert.h"
#import "RCTLog.h"
#import "RCTUtils.h"
static NSString *const RCTStorageDirectory = @"RCTAsyncLocalStorage_V1";
static NSString *const RCTManifestFileName = @"manifest.json";
static const NSUInteger RCTInlineValueThreshold = 1024;
#pragma mark - Static helper functions
static NSDictionary *RCTErrorForKey(NSString *key)
{
if (![key isKindOfClass:[NSString class]]) {
return RCTMakeAndLogError(@"Invalid key - must be a string. Key: ", key, @{@"key": key});
} else if (key.length < 1) {
return RCTMakeAndLogError(@"Invalid key - must be at least one character. Key: ", key, @{@"key": key});
} else {
return nil;
}
}
static void RCTAppendError(NSDictionary *error, NSMutableArray<NSDictionary *> **errors)
{
if (error && errors) {
if (!*errors) {
*errors = [NSMutableArray new];
}
[*errors addObject:error];
}
}
static NSString *RCTReadFile(NSString *filePath, NSString *key, NSDictionary **errorOut)
{
if ([[NSFileManager defaultManager] fileExistsAtPath:filePath]) {
NSError *error;
NSStringEncoding encoding;
NSString *entryString = [NSString stringWithContentsOfFile:filePath usedEncoding:&encoding error:&error];
if (error) {
*errorOut = RCTMakeError(@"Failed to read storage file.", error, @{@"key": key});
} else if (encoding != NSUTF8StringEncoding) {
*errorOut = RCTMakeError(@"Incorrect encoding of storage file: ", @(encoding), @{@"key": key});
} else {
return entryString;
}
}
return nil;
}
static NSString *RCTGetStorageDirectory()
{
static NSString *storageDirectory = nil;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
storageDirectory = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES).firstObject;
storageDirectory = [storageDirectory stringByAppendingPathComponent:RCTStorageDirectory];
});
return storageDirectory;
}
static NSString *RCTGetManifestFilePath()
{
static NSString *manifestFilePath = nil;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
manifestFilePath = [RCTGetStorageDirectory() stringByAppendingPathComponent:RCTManifestFileName];
});
return manifestFilePath;
}
// Only merges objects - all other types are just clobbered (including arrays)
static BOOL RCTMergeRecursive(NSMutableDictionary *destination, NSDictionary *source)
{
BOOL modified = NO;
for (NSString *key in source) {
id sourceValue = source[key];
id destinationValue = destination[key];
if ([sourceValue isKindOfClass:[NSDictionary class]]) {
if ([destinationValue isKindOfClass:[NSDictionary class]]) {
if ([destinationValue classForCoder] != [NSMutableDictionary class]) {
destinationValue = [destinationValue mutableCopy];
}
if (RCTMergeRecursive(destinationValue, sourceValue)) {
destination[key] = destinationValue;
modified = YES;
}
} else {
destination[key] = [sourceValue copy];
modified = YES;
}
} else if (![source isEqual:destinationValue]) {
destination[key] = [sourceValue copy];
modified = YES;
}
}
return modified;
}
static dispatch_queue_t RCTGetMethodQueue()
{
// We want all instances to share the same queue since they will be reading/writing the same files.
static dispatch_queue_t queue;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
queue = dispatch_queue_create("com.facebook.react.AsyncLocalStorageQueue", DISPATCH_QUEUE_SERIAL);
});
return queue;
}
static NSCache *RCTGetCache()
{
// We want all instances to share the same cache since they will be reading/writing the same files.
static NSCache *cache;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
cache = [NSCache new];
cache.totalCostLimit = 2 * 1024 * 1024; // 2MB
// Clear cache in the event of a memory warning
[[NSNotificationCenter defaultCenter] addObserverForName:UIApplicationDidReceiveMemoryWarningNotification object:nil queue:nil usingBlock:^(__unused NSNotification *note) {
[cache removeAllObjects];
}];
});
return cache;
}
static BOOL RCTHasCreatedStorageDirectory = NO;
static NSDictionary *RCTDeleteStorageDirectory()
{
NSError *error;
[[NSFileManager defaultManager] removeItemAtPath:RCTGetStorageDirectory() error:&error];
RCTHasCreatedStorageDirectory = NO;
return error ? RCTMakeError(@"Failed to delete storage directory.", error, nil) : nil;
}
#pragma mark - RCTAsyncLocalStorage
@implementation RCTAsyncLocalStorage
{
BOOL _haveSetup;
// The manifest is a dictionary of all keys with small values inlined. Null values indicate values that are stored
// in separate files (as opposed to nil values which don't exist). The manifest is read off disk at startup, and
// written to disk after all mutations.
NSMutableDictionary<NSString *, NSString *> *_manifest;
}
RCT_EXPORT_MODULE()
- (dispatch_queue_t)methodQueue
{
return RCTGetMethodQueue();
}
- (void)clearAllData
{
dispatch_async(RCTGetMethodQueue(), ^{
[self->_manifest removeAllObjects];
[RCTGetCache() removeAllObjects];
RCTDeleteStorageDirectory();
});
}
+ (void)clearAllData
{
dispatch_async(RCTGetMethodQueue(), ^{
[RCTGetCache() removeAllObjects];
RCTDeleteStorageDirectory();
});
}
- (void)invalidate
{
if (_clearOnInvalidate) {
[RCTGetCache() removeAllObjects];
RCTDeleteStorageDirectory();
}
_clearOnInvalidate = NO;
[_manifest removeAllObjects];
_haveSetup = NO;
}
- (BOOL)isValid
{
return _haveSetup;
}
- (void)dealloc
{
[self invalidate];
}
- (NSString *)_filePathForKey:(NSString *)key
{
NSString *safeFileName = RCTMD5Hash(key);
return [RCTGetStorageDirectory() stringByAppendingPathComponent:safeFileName];
}
- (NSDictionary *)_ensureSetup
{
RCTAssertThread(RCTGetMethodQueue(), @"Must be executed on storage thread");
NSError *error = nil;
if (!RCTHasCreatedStorageDirectory) {
[[NSFileManager defaultManager] createDirectoryAtPath:RCTGetStorageDirectory()
withIntermediateDirectories:YES
attributes:nil
error:&error];
if (error) {
return RCTMakeError(@"Failed to create storage directory.", error, nil);
}
RCTHasCreatedStorageDirectory = YES;
}
if (!_haveSetup) {
NSDictionary *errorOut;
NSString *serialized = RCTReadFile(RCTGetManifestFilePath(), nil, &errorOut);
_manifest = serialized ? RCTJSONParseMutable(serialized, &error) : [NSMutableDictionary new];
if (error) {
RCTLogWarn(@"Failed to parse manifest - creating new one.\n\n%@", error);
_manifest = [NSMutableDictionary new];
}
_haveSetup = YES;
}
return nil;
}
- (NSDictionary *)_writeManifest:(NSMutableArray<NSDictionary *> **)errors
{
NSError *error;
NSString *serialized = RCTJSONStringify(_manifest, &error);
[serialized writeToFile:RCTGetManifestFilePath() atomically:YES encoding:NSUTF8StringEncoding error:&error];
NSDictionary *errorOut;
if (error) {
errorOut = RCTMakeError(@"Failed to write manifest file.", error, nil);
RCTAppendError(errorOut, errors);
}
return errorOut;
}
- (NSDictionary *)_appendItemForKey:(NSString *)key
toArray:(NSMutableArray<NSArray<NSString *> *> *)result
{
NSDictionary *errorOut = RCTErrorForKey(key);
if (errorOut) {
return errorOut;
}
NSString *value = [self _getValueForKey:key errorOut:&errorOut];
[result addObject:@[key, RCTNullIfNil(value)]]; // Insert null if missing or failure.
return errorOut;
}
- (NSString *)_getValueForKey:(NSString *)key errorOut:(NSDictionary **)errorOut
{
NSString *value = _manifest[key]; // nil means missing, null means there may be a data file, else: NSString
if (value == (id)kCFNull) {
value = [RCTGetCache() objectForKey:key];
if (!value) {
NSString *filePath = [self _filePathForKey:key];
value = RCTReadFile(filePath, key, errorOut);
if (value) {
[RCTGetCache() setObject:value forKey:key cost:value.length];
} else {
// file does not exist after all, so remove from manifest (no need to save
// manifest immediately though, as cost of checking again next time is negligible)
[_manifest removeObjectForKey:key];
}
}
}
return value;
}
- (NSDictionary *)_writeEntry:(NSArray<NSString *> *)entry changedManifest:(BOOL *)changedManifest
{
if (entry.count != 2) {
return RCTMakeAndLogError(@"Entries must be arrays of the form [key: string, value: string], got: ", entry, nil);
}
NSString *key = entry[0];
NSDictionary *errorOut = RCTErrorForKey(key);
if (errorOut) {
return errorOut;
}
NSString *value = entry[1];
NSString *filePath = [self _filePathForKey:key];
NSError *error;
if (value.length <= RCTInlineValueThreshold) {
if (_manifest[key] == (id)kCFNull) {
// If the value already existed but wasn't inlined, remove the old file.
[[NSFileManager defaultManager] removeItemAtPath:filePath error:nil];
[RCTGetCache() removeObjectForKey:key];
}
*changedManifest = YES;
_manifest[key] = value;
return nil;
}
[value writeToFile:filePath atomically:YES encoding:NSUTF8StringEncoding error:&error];
[RCTGetCache() setObject:value forKey:key cost:value.length];
if (error) {
errorOut = RCTMakeError(@"Failed to write value.", error, @{@"key": key});
} else if (_manifest[key] != (id)kCFNull) {
*changedManifest = YES;
_manifest[key] = (id)kCFNull;
}
return errorOut;
}
#pragma mark - Exported JS Functions
RCT_EXPORT_METHOD(multiGet:(NSArray<NSString *> *)keys
callback:(RCTResponseSenderBlock)callback)
{
NSDictionary *errorOut = [self _ensureSetup];
if (errorOut) {
callback(@[@[errorOut], (id)kCFNull]);
return;
}
NSMutableArray<NSDictionary *> *errors;
NSMutableArray<NSArray<NSString *> *> *result = [[NSMutableArray alloc] initWithCapacity:keys.count];
for (NSString *key in keys) {
id keyError;
id value = [self _getValueForKey:key errorOut:&keyError];
[result addObject:@[key, RCTNullIfNil(value)]];
RCTAppendError(keyError, &errors);
}
callback(@[RCTNullIfNil(errors), result]);
}
RCT_EXPORT_METHOD(multiSet:(NSArray<NSArray<NSString *> *> *)kvPairs
callback:(RCTResponseSenderBlock)callback)
{
NSDictionary *errorOut = [self _ensureSetup];
if (errorOut) {
callback(@[@[errorOut]]);
return;
}
BOOL changedManifest = NO;
NSMutableArray<NSDictionary *> *errors;
for (NSArray<NSString *> *entry in kvPairs) {
NSDictionary *keyError = [self _writeEntry:entry changedManifest:&changedManifest];
RCTAppendError(keyError, &errors);
}
if (changedManifest) {
[self _writeManifest:&errors];
}
callback(@[RCTNullIfNil(errors)]);
}
RCT_EXPORT_METHOD(multiMerge:(NSArray<NSArray<NSString *> *> *)kvPairs
callback:(RCTResponseSenderBlock)callback)
{
NSDictionary *errorOut = [self _ensureSetup];
if (errorOut) {
callback(@[@[errorOut]]);
return;
}
BOOL changedManifest = NO;
NSMutableArray<NSDictionary *> *errors;
for (__strong NSArray<NSString *> *entry in kvPairs) {
NSDictionary *keyError;
NSString *value = [self _getValueForKey:entry[0] errorOut:&keyError];
if (!keyError) {
if (value) {
NSError *jsonError;
NSMutableDictionary *mergedVal = RCTJSONParseMutable(value, &jsonError);
if (RCTMergeRecursive(mergedVal, RCTJSONParse(entry[1], &jsonError))) {
entry = @[entry[0], RCTNullIfNil(RCTJSONStringify(mergedVal, NULL))];
}
if (jsonError) {
keyError = RCTJSErrorFromNSError(jsonError);
}
}
if (!keyError) {
keyError = [self _writeEntry:entry changedManifest:&changedManifest];
}
}
RCTAppendError(keyError, &errors);
}
if (changedManifest) {
[self _writeManifest:&errors];
}
callback(@[RCTNullIfNil(errors)]);
}
RCT_EXPORT_METHOD(multiRemove:(NSArray<NSString *> *)keys
callback:(RCTResponseSenderBlock)callback)
{
NSDictionary *errorOut = [self _ensureSetup];
if (errorOut) {
callback(@[@[errorOut]]);
return;
}
NSMutableArray<NSDictionary *> *errors;
BOOL changedManifest = NO;
for (NSString *key in keys) {
NSDictionary *keyError = RCTErrorForKey(key);
if (!keyError) {
if (_manifest[key] == (id)kCFNull) {
NSString *filePath = [self _filePathForKey:key];
[[NSFileManager defaultManager] removeItemAtPath:filePath error:nil];
[RCTGetCache() removeObjectForKey:key];
// remove the key from manifest, but no need to mark as changed just for
// this, as the cost of checking again next time is negligible.
[_manifest removeObjectForKey:key];
} else if (_manifest[key]) {
changedManifest = YES;
[_manifest removeObjectForKey:key];
}
}
RCTAppendError(keyError, &errors);
}
if (changedManifest) {
[self _writeManifest:&errors];
}
callback(@[RCTNullIfNil(errors)]);
}
RCT_EXPORT_METHOD(clear:(RCTResponseSenderBlock)callback)
{
[_manifest removeAllObjects];
[RCTGetCache() removeAllObjects];
NSDictionary *error = RCTDeleteStorageDirectory();
callback(@[RCTNullIfNil(error)]);
}
RCT_EXPORT_METHOD(getAllKeys:(RCTResponseSenderBlock)callback)
{
NSDictionary *errorOut = [self _ensureSetup];
if (errorOut) {
callback(@[errorOut, (id)kCFNull]);
} else {
callback(@[(id)kCFNull, _manifest.allKeys]);
}
}
@end
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