Respond to CR.

Signal/src/util/OWSBackupImportJob.m

@@ -391,22 +391,15 @@ NSString *const kOWSBackup_ImportDatabaseKeySpec = @"kOWSBackup_ImportDatabaseKe
                     aborted = YES;
                     return completion(NO);
                 }
-                SignalIOSProtoBackupSnapshot *_Nullable entities;
-                @try {
                 NSError *error;
-                    entities = [SignalIOSProtoBackupSnapshot parseData:uncompressedData error:&error];
+                SignalIOSProtoBackupSnapshot *_Nullable entities =
+                    [SignalIOSProtoBackupSnapshot parseData:uncompressedData error:&error];
                 if (!entities || error) {
                     DDLogError(@"%@ could not parse proto: %@.", self.logTag, error);
                     // Database-related errors are unrecoverable.
                     aborted = YES;
                     return completion(NO);
                 }
-                } @catch (NSException *exception) {
-                    OWSProdLogAndFail(@"%@ Could not parse proto: %@", self.logTag, exception.debugDescription);
-                    // TODO: Add analytics.
-                    aborted = YES;
-                    return completion(NO);
-                }
                 if (!entities || entities.entity.count < 1) {
                     DDLogError(@"%@ missing entities.", self.logTag);
                     // Database-related errors are unrecoverable.

SignalServiceKit/src/Messages/OWSMessageReceiver.m

@@ -328,11 +328,9 @@ NSString *const OWSMessageDecryptJobFinderExtensionGroup = @"OWSMessageProcessin
     AssertOnDispatchQueue(self.serialQueue);
     OWSAssert(job);
 
-    SSKProtoEnvelope *_Nullable envelope = nil;
-    @try {
-        envelope = job.envelopeProto;
-    } @catch (NSException *exception) {
-        OWSProdLogAndFail(@"%@ Could not parse proto: %@", self.logTag, exception.debugDescription);
+    SSKProtoEnvelope *_Nullable envelope = job.envelopeProto;
+    if (!envelope) {
+        OWSProdLogAndFail(@"%@ Could not parse proto.", self.logTag);
         // TODO: Add analytics.
 
         [[OWSPrimaryStorage.sharedManager newDatabaseConnection]

SignalServiceKit/src/Network/WebSockets/TSSocketManager.m

@@ -698,19 +698,12 @@ NSString *const kNSNotification_SocketManagerStateDidChange = @"kNSNotification_
     // If we receive a response, we know we're not de-registered.
     [TSAccountManager.sharedInstance setIsDeregistered:NO];
 
-    WebSocketProtoWebSocketMessage *_Nullable wsMessage;
-    @try {
     NSError *error;
-        wsMessage = [WebSocketProtoWebSocketMessage parseData:data error:&error];
+    WebSocketProtoWebSocketMessage *_Nullable wsMessage = [WebSocketProtoWebSocketMessage parseData:data error:&error];
     if (!wsMessage || error) {
         OWSFail(@"%@ could not parse proto: %@", self.logTag, error);
         return;
     }
-    } @catch (NSException *exception) {
-        OWSProdLogAndFail(@"%@ Received an invalid message: %@", self.logTag, exception.debugDescription);
-        // TODO: Add analytics.
-        return;
-    }
 
     if (wsMessage.type == WebSocketProtoWebSocketMessageTypeRequest) {
         [self processWebSocketRequestMessage:wsMessage.request];

SignalServiceKit/src/Security/OWSFingerprint.m

@@ -93,9 +93,8 @@ static uint32_t const OWSFingerprintDefaultHashIterations = 5200;
     OWSAssert(data.length > 0);
     OWSAssert(error);
 
-    FingerprintProtoLogicalFingerprints *logicalFingerprints;
-    @try {
     *error = nil;
+    FingerprintProtoLogicalFingerprints *_Nullable logicalFingerprints;
     logicalFingerprints = [FingerprintProtoLogicalFingerprints parseData:data error:error];
     if (!logicalFingerprints || *error) {
         OWSFail(@"%@ fingerprint failure: %@", self.logTag, *error);
@@ -104,11 +103,6 @@ static uint32_t const OWSFingerprintDefaultHashIterations = 5200;
         *error = OWSErrorWithCodeDescription(OWSErrorCodePrivacyVerificationFailure, description);
         return NO;
     }
-    } @catch (NSException *exception) {
-        // Sync log in case we bail.
-        DDLogError(@"%@ parsing QRCode data failed with error: %@", self.logTag, exception);
-        @throw exception;
-    }
 
     if (logicalFingerprints.version < OWSFingerprintScannableFormatVersion) {
         DDLogWarn(@"%@ Verification failed. They're running an old version.", self.logTag);