Respond to CR.

Signal/src/util/OWSBackupAPI.swift

@@ -239,10 +239,7 @@ import CloudKit
                                              success: @escaping (()) -> Void,
                                              failure: @escaping (Error) -> Void) {
 
-        var recordIDs = [CKRecordID]()
-        for recordName in recordNames {
-            recordIDs.append(CKRecordID(recordName: recordName))
-        }
+        let recordIDs = recordNames.map { CKRecordID(recordName: $0) }
         let deleteOperation = CKModifyRecordsOperation(recordsToSave: nil, recordIDsToDelete: recordIDs)
         deleteOperation.modifyRecordsCompletionBlock = { (records, recordIds, error) in
 

Signal/src/util/OWSBackupExportJob.m

@@ -65,7 +65,7 @@ NS_ASSUME_NONNULL_BEGIN
 // Writes db entities using protobufs into snapshot fragments.
 // Snapshot fragments are compressed (they compress _very well_,
 // around 20x smaller) then encrypted.  Ordering matters in
-// snapshot contents (entities should we restored in the same
+// snapshot contents (entities should be restored in the same
 // order they are serialized), so we are always careful to preserve
 // ordering of entities within a snapshot AND ordering of snapshot
 // fragments within a bakckup.
@@ -80,7 +80,7 @@ NS_ASSUME_NONNULL_BEGIN
 
 @property (nonatomic) NSMutableArray<OWSBackupExportItem *> *exportItems;
 
-@property (nonatomic, nullable) OWSSignalServiceProtosBackupSnapshotBuilder *backupSnapshotBuilder;
+@property (nonatomic, nullable) OWSSignaliOSProtosBackupSnapshotBuilder *backupSnapshotBuilder;
 
 @property (nonatomic) NSUInteger cachedItemCount;
 
@@ -113,7 +113,7 @@ NS_ASSUME_NONNULL_BEGIN
 // use this state), but I think it'll be helpful to have around to future-proof
 // this work, help with debugging issue, etc.
 - (BOOL)writeObject:(TSYapDatabaseObject *)object
-         entityType:(OWSSignalServiceProtosBackupSnapshotBackupEntityType)entityType
+         entityType:(OWSSignaliOSProtosBackupSnapshotBackupEntityType)entityType
 {
     OWSAssert(object);
 
@@ -124,11 +124,11 @@ NS_ASSUME_NONNULL_BEGIN
     }
 
     if (!self.backupSnapshotBuilder) {
-        self.backupSnapshotBuilder = [OWSSignalServiceProtosBackupSnapshotBuilder new];
+        self.backupSnapshotBuilder = [OWSSignaliOSProtosBackupSnapshotBuilder new];
     }
 
-    OWSSignalServiceProtosBackupSnapshotBackupEntityBuilder *entityBuilder =
-        [OWSSignalServiceProtosBackupSnapshotBackupEntityBuilder new];
+    OWSSignaliOSProtosBackupSnapshotBackupEntityBuilder *entityBuilder =
+        [OWSSignaliOSProtosBackupSnapshotBackupEntityBuilder new];
     [entityBuilder setType:entityType];
     [entityBuilder setEntityData:data];
 
@@ -426,12 +426,12 @@ NS_ASSUME_NONNULL_BEGIN
         NSString *,
         Class,
         EntityFilter _Nullable,
-        OWSSignalServiceProtosBackupSnapshotBackupEntityType);
+        OWSSignaliOSProtosBackupSnapshotBackupEntityType);
     ExportBlock exportEntities = ^(YapDatabaseReadTransaction *transaction,
         NSString *collection,
         Class expectedClass,
         EntityFilter _Nullable filter,
-        OWSSignalServiceProtosBackupSnapshotBackupEntityType entityType) {
+        OWSSignaliOSProtosBackupSnapshotBackupEntityType entityType) {
         __block NSUInteger count = 0;
         [transaction
             enumerateKeysAndObjectsInCollection:collection
@@ -469,7 +469,7 @@ NS_ASSUME_NONNULL_BEGIN
             [TSThread collection],
             [TSThread class],
             nil,
-            OWSSignalServiceProtosBackupSnapshotBackupEntityTypeThread);
+            OWSSignaliOSProtosBackupSnapshotBackupEntityTypeThread);
         if (aborted) {
             return;
         }
@@ -499,7 +499,7 @@ NS_ASSUME_NONNULL_BEGIN
 
                 return YES;
             },
-            OWSSignalServiceProtosBackupSnapshotBackupEntityTypeAttachment);
+            OWSSignaliOSProtosBackupSnapshotBackupEntityTypeAttachment);
         if (aborted) {
             return;
         }
@@ -523,7 +523,7 @@ NS_ASSUME_NONNULL_BEGIN
                 }
                 return YES;
             },
-            OWSSignalServiceProtosBackupSnapshotBackupEntityTypeInteraction);
+            OWSSignaliOSProtosBackupSnapshotBackupEntityTypeInteraction);
         if (aborted) {
             return;
         }
@@ -532,7 +532,7 @@ NS_ASSUME_NONNULL_BEGIN
             [OWSDatabaseMigration collection],
             [OWSDatabaseMigration class],
             nil,
-            OWSSignalServiceProtosBackupSnapshotBackupEntityTypeMigration);
+            OWSSignaliOSProtosBackupSnapshotBackupEntityTypeMigration);
     }];
 
     if (aborted || self.isComplete) {
@@ -568,28 +568,36 @@ NS_ASSUME_NONNULL_BEGIN
     self.savedDatabaseItems = [NSMutableArray new];
     self.savedAttachmentItems = [NSMutableArray new];
 
+    unsigned long long totalFileSize = 0;
+    NSUInteger totalFileCount = 0;
     {
-        unsigned long long totalFileSize = 0;
+        unsigned long long databaseFileSize = 0;
         for (OWSBackupExportItem *item in self.unsavedDatabaseItems) {
-            totalFileSize += [OWSFileSystem fileSizeOfPath:item.encryptedItem.filePath].unsignedLongLongValue;
+            databaseFileSize += [OWSFileSystem fileSizeOfPath:item.encryptedItem.filePath].unsignedLongLongValue;
         }
         DDLogInfo(@"%@ exporting %@: count: %zd, bytes: %llu.",
             self.logTag,
             @"database items",
             self.unsavedDatabaseItems.count,
-            totalFileSize);
+            databaseFileSize);
+        totalFileSize += databaseFileSize;
+        totalFileCount += self.unsavedDatabaseItems.count;
     }
     {
-        unsigned long long totalFileSize = 0;
+        unsigned long long attachmentFileSize = 0;
         for (OWSAttachmentExport *attachmentExport in self.unsavedAttachmentExports) {
-            totalFileSize += [OWSFileSystem fileSizeOfPath:attachmentExport.attachmentFilePath].unsignedLongLongValue;
+            attachmentFileSize +=
+                [OWSFileSystem fileSizeOfPath:attachmentExport.attachmentFilePath].unsignedLongLongValue;
         }
         DDLogInfo(@"%@ exporting %@: count: %zd, bytes: %llu.",
             self.logTag,
             @"attachment items",
             self.unsavedAttachmentExports.count,
-            totalFileSize);
+            attachmentFileSize);
+        totalFileSize += attachmentFileSize;
+        totalFileCount += self.unsavedAttachmentExports.count;
     }
+    DDLogInfo(@"%@ exporting %@: count: %zd, bytes: %llu.", self.logTag, @"all items", totalFileCount, totalFileSize);
 
     [self saveNextFileToCloudWithCompletion:completion];
 }

Signal/src/util/OWSBackupIO.m

@@ -13,6 +13,10 @@ NS_ASSUME_NONNULL_BEGIN
 // TODO:
 static const NSUInteger kOWSBackupKeyLength = 32;
 
+// LZMA algorithm significantly outperforms the other compressionlib options
+// for our database snapshots and is a widely adopted standard.
+static const compression_algorithm SignalCompressionAlgorithm = COMPRESSION_LZMA;
+
 @implementation OWSBackupEncryptedItem
 
 @end
@@ -196,9 +200,8 @@ static const NSUInteger kOWSBackupKeyLength = 32;
         if (!dstBuffer) {
             return nil;
         }
-        // TODO: Should we use COMPRESSION_LZFSE?
-        size_t dstLength
-            = compression_encode_buffer(dstBuffer, dstBufferLength, srcBuffer, srcLength, NULL, COMPRESSION_LZFSE);
+        size_t dstLength = compression_encode_buffer(
+            dstBuffer, dstBufferLength, srcBuffer, srcLength, NULL, SignalCompressionAlgorithm);
         NSData *compressedData = [NSData dataWithBytesNoCopy:dstBuffer length:dstLength freeWhenDone:YES];
 
         DDLogVerbose(@"%@ compressed %zd -> %zd = %0.2f",
@@ -233,9 +236,8 @@ static const NSUInteger kOWSBackupKeyLength = 32;
         if (!dstBuffer) {
             return nil;
         }
-        // TODO: Should we use COMPRESSION_LZFSE?
-        size_t dstLength
-            = compression_decode_buffer(dstBuffer, dstBufferLength, srcBuffer, srcLength, NULL, COMPRESSION_LZFSE);
+        size_t dstLength = compression_decode_buffer(
+            dstBuffer, dstBufferLength, srcBuffer, srcLength, NULL, SignalCompressionAlgorithm);
         NSData *decompressedData = [NSData dataWithBytesNoCopy:dstBuffer length:dstLength freeWhenDone:YES];
         OWSAssert(decompressedData.length == uncompressedDataLength);
         DDLogVerbose(@"%@ decompressed %zd -> %zd = %0.2f",

Signal/src/util/OWSBackupImportJob.m

@@ -515,15 +515,15 @@ NSString *const kOWSBackup_ImportDatabaseKeySpec = @"kOWSBackup_ImportDatabaseKe
                     aborted = YES;
                     return completion(NO);
                 }
-                OWSSignalServiceProtosBackupSnapshot *_Nullable entities =
-                    [OWSSignalServiceProtosBackupSnapshot parseFromData:uncompressedData];
+                OWSSignaliOSProtosBackupSnapshot *_Nullable entities =
+                    [OWSSignaliOSProtosBackupSnapshot parseFromData:uncompressedData];
                 if (!entities || entities.entity.count < 1) {
                     DDLogError(@"%@ missing entities.", self.logTag);
                     // Database-related errors are unrecoverable.
                     aborted = YES;
                     return completion(NO);
                 }
-                for (OWSSignalServiceProtosBackupSnapshotBackupEntity *entity in entities.entity) {
+                for (OWSSignaliOSProtosBackupSnapshotBackupEntity *entity in entities.entity) {
                     NSData *_Nullable entityData = entity.entityData;
                     if (entityData.length < 1) {
                         DDLogError(@"%@ missing entity data.", self.logTag);