exception auditing OWSRaiseException

SignalMessaging/environment/migrations/OWSDatabaseMigration.m

@@ -40,7 +40,8 @@ NS_ASSUME_NONNULL_BEGIN
 
 + (NSString *)migrationId
 {
-    OWSRaiseException(NSInternalInconsistencyException, @"Must override %@ in subclass", NSStringFromSelector(_cmd));
+    OWSAbstractMethod();
+    return @"";
 }
 
 + (NSString *)collection
@@ -51,7 +52,7 @@ NS_ASSUME_NONNULL_BEGIN
 
 - (void)runUpWithTransaction:(YapDatabaseReadWriteTransaction *)transaction
 {
-    OWSRaiseException(NSInternalInconsistencyException, @"Must override %@ in subclass", NSStringFromSelector(_cmd));
+    OWSAbstractMethod();
 }
 
 - (void)runUpWithCompletion:(OWSDatabaseMigrationCompletion)completion

SignalServiceKit/src/Account/TSAccountManager.m

@@ -159,7 +159,7 @@ NSString *const TSAccountManager_NeedsAccountAttributesUpdateKey = @"TSAccountMa
     NSString *phoneNumber = self.phoneNumberAwaitingVerification;
 
     if (!phoneNumber) {
-        OWSRaiseException(@"RegistrationFail", @"Internal Corrupted State");
+        OWSFail(@"phonNumber was unexpectedly nil");
     }
 
     [self storeLocalNumber:phoneNumber];

SignalServiceKit/src/Contacts/CDSSigningCertificate.m

@@ -213,8 +213,7 @@ NS_ASSUME_NONNULL_BEGIN
         // We need to use an Intel certificate as the anchor for IAS verification.
         NSData *_Nullable anchorCertificate = [self certificateDataForService:@"ias-root"];
         if (!anchorCertificate) {
-            OWSFailDebug(@"could not load anchor certificate.");
-            OWSRaiseException(@"OWSSignalService_CouldNotLoadCertificate", @"%s", __PRETTY_FUNCTION__);
+            OWSFail(@"could not load anchor certificate.");
         } else {
             anchorCertificates = @[ anchorCertificate ];
         }

SignalServiceKit/src/Messages/OWSMessageSender.m

@@ -839,7 +839,7 @@ NSString *const OWSMessageSenderRateLimitedException = @"RateLimitedException";
 
     NSArray<NSDictionary *> *deviceMessages;
     @try {
-        deviceMessages = [self deviceMessagesForMessageSendUnsafe:messageSend];
+        deviceMessages = [self try_deviceMessagesForMessageSendUnsafe:messageSend];
     } @catch (NSException *exception) {
         if ([exception.name isEqualToString:UntrustedIdentityKeyException]) {
             // This *can* happen under normal usage, but it should happen relatively rarely.
@@ -1407,8 +1407,7 @@ NSString *const OWSMessageSenderRateLimitedException = @"RateLimitedException";
     [self sendMessageToRecipient:messageSend];
 }
 
-// NOTE: This method uses exceptions for control flow.
-- (NSArray<NSDictionary *> *)deviceMessagesForMessageSendUnsafe:(OWSMessageSend *)messageSend
+- (NSArray<NSDictionary *> *)try_deviceMessagesForMessageSendUnsafe:(OWSMessageSend *)messageSend
 {
     OWSAssertDebug(messageSend.message);
     OWSAssertDebug(messageSend.recipient);
@@ -1444,7 +1443,7 @@ NSString *const OWSMessageSenderRateLimitedException = @"RateLimitedException";
         @try {
             // This may involve blocking network requests, so we do it _before_
             // we open a transaction.
-            [self ensureRecipientHasSessionForMessageSend:messageSend deviceId:deviceId];
+            [self try_ensureRecipientHasSessionForMessageSend:messageSend deviceId:deviceId];
 
             __block NSDictionary *messageDict;
             __block NSException *encryptionException;
@@ -1486,9 +1485,7 @@ NSString *const OWSMessageSenderRateLimitedException = @"RateLimitedException";
     return [messagesArray copy];
 }
 
-// NOTE: This method uses exceptions for control flow.
-- (void)ensureRecipientHasSessionForMessageSend:(OWSMessageSend *)messageSend
-                                       deviceId:(NSNumber *)deviceId
+- (void)try_ensureRecipientHasSessionForMessageSend:(OWSMessageSend *)messageSend deviceId:(NSNumber *)deviceId
 {
     OWSAssertDebug(messageSend);
     OWSAssertDebug(deviceId);