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ccb4a88742
git remote add ssk ../SignalServiceKit git remote update git merge -s ours --allow-unrelated-histories --no-commit ssk/master git read-tree --prefix=SignalServiceKit -u ssk/master git commit
225 lines
9 KiB
Objective-C
225 lines
9 KiB
Objective-C
//
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// Copyright (c) 2017 Open Whisper Systems. All rights reserved.
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//
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#import "OWSDisappearingMessagesFinder.h"
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#import "NSDate+millisecondTimeStamp.h"
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#import "TSMessage.h"
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#import "TSOutgoingMessage.h"
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#import "TSStorageManager.h"
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#import "TSThread.h"
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#import <YapDatabase/YapDatabaseConnection.h>
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#import <YapDatabase/YapDatabaseQuery.h>
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#import <YapDatabase/YapDatabaseSecondaryIndex.h>
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NS_ASSUME_NONNULL_BEGIN
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static NSString *const OWSDisappearingMessageFinderThreadIdColumn = @"thread_id";
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static NSString *const OWSDisappearingMessageFinderExpiresAtColumn = @"expires_at";
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static NSString *const OWSDisappearingMessageFinderExpiresAtIndex = @"index_messages_on_expires_at_and_thread_id_v2";
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@implementation OWSDisappearingMessagesFinder
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- (NSArray<NSString *> *)fetchUnstartedExpiringMessageIdsInThread:(TSThread *)thread
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transaction:(YapDatabaseReadTransaction *_Nonnull)transaction
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{
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OWSAssert(transaction);
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NSMutableArray<NSString *> *messageIds = [NSMutableArray new];
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NSString *formattedString = [NSString stringWithFormat:@"WHERE %@ = 0 AND %@ = \"%@\"",
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OWSDisappearingMessageFinderExpiresAtColumn,
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OWSDisappearingMessageFinderThreadIdColumn,
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thread.uniqueId];
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YapDatabaseQuery *query = [YapDatabaseQuery queryWithFormat:formattedString];
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[[transaction ext:OWSDisappearingMessageFinderExpiresAtIndex]
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enumerateKeysMatchingQuery:query
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usingBlock:^void(NSString *collection, NSString *key, BOOL *stop) {
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[messageIds addObject:key];
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}];
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return [messageIds copy];
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}
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- (NSArray<NSString *> *)fetchExpiredMessageIdsWithTransaction:(YapDatabaseReadTransaction *_Nonnull)transaction
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{
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OWSAssert(transaction);
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NSMutableArray<NSString *> *messageIds = [NSMutableArray new];
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uint64_t now = [NSDate ows_millisecondTimeStamp];
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// When (expiresAt == 0) the message SHOULD NOT expire. Careful ;)
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NSString *formattedString = [NSString stringWithFormat:@"WHERE %@ > 0 AND %@ <= %lld",
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OWSDisappearingMessageFinderExpiresAtColumn,
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OWSDisappearingMessageFinderExpiresAtColumn,
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now];
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YapDatabaseQuery *query = [YapDatabaseQuery queryWithFormat:formattedString];
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[[transaction ext:OWSDisappearingMessageFinderExpiresAtIndex]
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enumerateKeysMatchingQuery:query
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usingBlock:^void(NSString *collection, NSString *key, BOOL *stop) {
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[messageIds addObject:key];
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}];
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return [messageIds copy];
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}
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- (nullable NSNumber *)nextExpirationTimestampWithTransaction:(YapDatabaseReadTransaction *)transaction
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{
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OWSAssert(transaction);
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NSString *formattedString = [NSString stringWithFormat:@"WHERE %@ > 0 ORDER BY %@ ASC",
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OWSDisappearingMessageFinderExpiresAtColumn,
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OWSDisappearingMessageFinderExpiresAtColumn];
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YapDatabaseQuery *query = [YapDatabaseQuery queryWithFormat:formattedString];
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__block TSMessage *firstMessage;
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[[transaction ext:OWSDisappearingMessageFinderExpiresAtIndex]
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enumerateKeysAndObjectsMatchingQuery:query
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usingBlock:^void(NSString *collection, NSString *key, id object, BOOL *stop) {
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firstMessage = (TSMessage *)object;
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*stop = YES;
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}];
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if (firstMessage && firstMessage.expiresAt > 0) {
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return [NSNumber numberWithUnsignedLongLong:firstMessage.expiresAt];
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}
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return nil;
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}
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- (void)enumerateUnstartedExpiringMessagesInThread:(TSThread *)thread
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block:(void (^_Nonnull)(TSMessage *message))block
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transaction:(YapDatabaseReadTransaction *)transaction
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{
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OWSAssert(transaction);
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for (NSString *expiringMessageId in
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[self fetchUnstartedExpiringMessageIdsInThread:thread transaction:transaction]) {
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TSMessage *_Nullable message = [TSMessage fetchObjectWithUniqueID:expiringMessageId transaction:transaction];
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if ([message isKindOfClass:[TSMessage class]]) {
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block(message);
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} else {
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DDLogError(@"%@ unexpected object: %@", self.tag, message);
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}
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}
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}
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/**
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* Don't use this in production. Useful for testing.
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* We don't want to instantiate potentially many messages at once.
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*/
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- (NSArray<TSMessage *> *)fetchUnstartedExpiringMessagesInThread:(TSThread *)thread
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transaction:(YapDatabaseReadTransaction *)transaction
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{
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OWSAssert(transaction);
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NSMutableArray<TSMessage *> *messages = [NSMutableArray new];
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[self enumerateUnstartedExpiringMessagesInThread:thread
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block:^(TSMessage *message) {
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[messages addObject:message];
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}
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transaction:transaction];
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return [messages copy];
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}
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- (void)enumerateExpiredMessagesWithBlock:(void (^_Nonnull)(TSMessage *message))block
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transaction:(YapDatabaseReadTransaction *)transaction
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{
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OWSAssert(transaction);
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// Since we can't directly mutate the enumerated expired messages, we store only their ids in hopes of saving a
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// little memory and then enumerate the (larger) TSMessage objects one at a time.
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for (NSString *expiredMessageId in [self fetchExpiredMessageIdsWithTransaction:transaction]) {
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TSMessage *_Nullable message = [TSMessage fetchObjectWithUniqueID:expiredMessageId transaction:transaction];
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if ([message isKindOfClass:[TSMessage class]]) {
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block(message);
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} else {
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DDLogError(@"%@ unexpected object: %@", self.tag, message);
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}
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}
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}
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/**
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* Don't use this in production. Useful for testing.
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* We don't want to instantiate potentially many messages at once.
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*/
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- (NSArray<TSMessage *> *)fetchExpiredMessagesWithTransaction:(YapDatabaseReadTransaction *)transaction
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{
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OWSAssert(transaction);
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NSMutableArray<TSMessage *> *messages = [NSMutableArray new];
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[self enumerateExpiredMessagesWithBlock:^(TSMessage *message) {
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[messages addObject:message];
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}
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transaction:transaction];
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return [messages copy];
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}
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#pragma mark - YapDatabaseExtension
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+ (YapDatabaseSecondaryIndex *)indexDatabaseExtension
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{
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YapDatabaseSecondaryIndexSetup *setup = [YapDatabaseSecondaryIndexSetup new];
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[setup addColumn:OWSDisappearingMessageFinderExpiresAtColumn withType:YapDatabaseSecondaryIndexTypeInteger];
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[setup addColumn:OWSDisappearingMessageFinderThreadIdColumn withType:YapDatabaseSecondaryIndexTypeText];
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YapDatabaseSecondaryIndexHandler *handler =
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[YapDatabaseSecondaryIndexHandler withObjectBlock:^(YapDatabaseReadTransaction *transaction,
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NSMutableDictionary *dict,
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NSString *collection,
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NSString *key,
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id object) {
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if (![object isKindOfClass:[TSMessage class]]) {
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return;
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}
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TSMessage *message = (TSMessage *)object;
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if (!message.shouldStartExpireTimer) {
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return;
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}
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dict[OWSDisappearingMessageFinderExpiresAtColumn] = @(message.expiresAt);
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dict[OWSDisappearingMessageFinderThreadIdColumn] = message.uniqueThreadId;
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}];
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return [[YapDatabaseSecondaryIndex alloc] initWithSetup:setup handler:handler];
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}
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// Useful for tests, don't use in app startup path because it's slow.
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+ (void)blockingRegisterDatabaseExtensions:(TSStorageManager *)storageManager
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{
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[storageManager.database registerExtension:[self indexDatabaseExtension]
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withName:OWSDisappearingMessageFinderExpiresAtIndex];
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}
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+ (void)asyncRegisterDatabaseExtensions:(TSStorageManager *)storageManager
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{
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[storageManager.database asyncRegisterExtension:[self indexDatabaseExtension]
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withName:OWSDisappearingMessageFinderExpiresAtIndex
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completionBlock:^(BOOL ready) {
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if (ready) {
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DDLogDebug(@"%@ completed registering extension async.", self.tag);
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} else {
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DDLogError(@"%@ failed registering extension async.", self.tag);
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}
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}];
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}
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#pragma mark - Logging
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+ (NSString *)tag
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{
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return [NSString stringWithFormat:@"[%@]", self.class];
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}
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- (NSString *)tag
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{
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return self.class.tag;
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}
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@end
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NS_ASSUME_NONNULL_END
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