Only dispatch async at top level.

Previously each method was dispatching it's callbacks async. This is a
waste of code, processing, and makes crash logs impenetrable.

// FREEBIE

SignalServiceKit.podspec

@@ -8,7 +8,7 @@
 
 Pod::Spec.new do |s|
   s.name             = "SignalServiceKit"
-  s.version          = "0.5.0"
+  s.version          = "0.5.1"
   s.summary          = "An Objective-C library for communicating with the Signal messaging service."
 
   s.description      = <<-DESC

src/Contacts/ContactsUpdater.h

@@ -3,6 +3,8 @@
 
 #import "SignalRecipient.h"
 
+NS_ASSUME_NONNULL_BEGIN
+
 @class Contact;
 
 @interface ContactsUpdater : NSObject
@@ -21,3 +23,5 @@
                                               success:(void (^)())success
                                               failure:(void (^)(NSError *error))failure;
 @end
+
+NS_ASSUME_NONNULL_END

src/Contacts/ContactsUpdater.m

@@ -11,6 +11,8 @@
 #import "TSNetworkManager.h"
 #import "TSStorageManager.h"
 
+NS_ASSUME_NONNULL_BEGIN
+
 @implementation ContactsUpdater
 
 + (instancetype)sharedUpdater {
@@ -51,19 +53,11 @@
                  failure:(void (^)(NSError *error))failure
 {
     if (!identifier) {
-        NSError *error
+        failure(OWSErrorWithCodeDescription(OWSErrorCodeInvalidMethodParameters, @"Cannot lookup nil identifier"));
-            = OWSErrorWithCodeDescription(OWSErrorCodeInvalidMethodParameters, @"Cannot lookup nil identifier");
-        BLOCK_SAFE_RUN(failure, error);
         return;
     }
 
-    [self contactIntersectionWithSet:[NSSet setWithObject:identifier]
+    [self contactIntersectionWithSet:[NSSet setWithObject:identifier] success:success failure:failure];
-        success:^(NSSet<NSString *> *matchedIds) {
-          BLOCK_SAFE_RUN(success, matchedIds);
-        }
-        failure:^(NSError *error) {
-          BLOCK_SAFE_RUN(failure, error);
-        }];
 }
 
 - (void)updateSignalContactIntersectionWithABContacts:(NSArray<Contact *> *)abContacts
@@ -77,7 +71,7 @@
         }
     }
 
-    __block NSMutableSet *recipientIds = [NSMutableSet set];
+    NSMutableSet *recipientIds = [NSMutableSet set];
     [[TSStorageManager sharedManager]
             .dbConnection readWithBlock:^(YapDatabaseReadTransaction *_Nonnull transaction) {
       NSArray *allRecipientKeys = [transaction allKeysInCollection:[SignalRecipient collection]];
@@ -91,20 +85,21 @@
                                  [recipientIds minusSet:matchedIds];
 
                                  // Cleaning up unregistered identifiers
-          [[TSStorageManager sharedManager]
+                                 [[TSStorageManager sharedManager].dbConnection
-                  .dbConnection readWriteWithBlock:^(YapDatabaseReadWriteTransaction *_Nonnull transaction) {
+                                     readWriteWithBlock:^(YapDatabaseReadWriteTransaction *transaction) {
                                          for (NSString *identifier in recipientIds) {
                                              SignalRecipient *recipient =
-                    [SignalRecipient fetchObjectWithUniqueID:identifier transaction:transaction];
+                                                 [SignalRecipient fetchObjectWithUniqueID:identifier
+                                                                              transaction:transaction];
+
                                              [recipient removeWithTransaction:transaction];
                                          }
                                      }];
 
-          BLOCK_SAFE_RUN(success);
+                                 DDLogInfo(@"%@ successfully intersected contacts.", self.tag);
+                                 success();
                              }
-        failure:^(NSError *error) {
+                             failure:failure];
-          BLOCK_SAFE_RUN(failure, error);
-        }];
 }
 
 - (void)contactIntersectionWithSet:(NSSet<NSString *> *)idSet
@@ -131,7 +126,7 @@
                     NSString *identifier = [phoneNumbersByHashes objectForKey:hash];
 
                     if (!identifier) {
-                        DDLogWarn(@"An interesecting hash wasn't found in the mapping.");
+                        DDLogWarn(@"%@ An interesecting hash wasn't found in the mapping.", self.tag);
                         break;
                     }
 
@@ -170,12 +165,26 @@
               }
             }];
 
-            BLOCK_SAFE_RUN(success, [NSSet setWithArray:attributesForIdentifier.allKeys]);
+            success([NSSet setWithArray:attributesForIdentifier.allKeys]);
           }
           failure:^(NSURLSessionDataTask *task, NSError *error) {
-            BLOCK_SAFE_RUN(failure, error);
+            failure(error);
           }];
     });
 }
 
+#pragma mark - Logging
+
++ (NSString *)tag
+{
+    return [NSString stringWithFormat:@"[%@]", self.class];
+}
+
+- (NSString *)tag
+{
+    return self.class.tag;
+}
+
 @end
+
+NS_ASSUME_NONNULL_END

src/Contacts/Threads/TSContactThread.m

@@ -35,7 +35,7 @@ NS_ASSUME_NONNULL_BEGIN
             success:^(NSSet<NSString *> *matchedIds) {
             }
             failure:^(NSError *error) {
-              DDLogInfo(@"Failed to retreive call status. Will be retreived on next contact intersection.");
+                DDLogWarn(@"Failed to lookup contact with error:%@", error);
             }];
         [recipient saveWithTransaction:transaction];
     }