keychain/ckks/CKKSProvideKeySetOperation.m

   1
   2 #if OCTAGON
   3
   4 #import "CKKSProvideKeySetOperation.h"
   5
   6 @interface CKKSProvideKeySetOperation ()
   7 @property (nullable) CKKSCurrentKeySet* keyset;
   8 @property dispatch_queue_t queue;
   9
  10 @property (nullable) NSOperation* startDependency;
  11 @end
  12
  13 @implementation CKKSProvideKeySetOperation
  14 @synthesize zoneName = _zoneName;
  15 @synthesize keyset = _keyset;
  16
  17 - (instancetype)initWithZoneName:(NSString*)zoneName
  18 {
  19     if((self = [super init])) {
  20         _zoneName = zoneName;
  21         _keyset = nil;
  22         _startDependency = [NSBlockOperation blockOperationWithBlock:^{}];
  23         _startDependency.name = @"key-set-provided";
  24
  25         _queue = dispatch_queue_create("key-set-queue", DISPATCH_QUEUE_SERIAL);
  26
  27         [self addDependency:_startDependency];
  28     }
  29     return self;
  30 }
  31
  32 - (void)provideKeySet:(CKKSCurrentKeySet *)keyset
  33 {
  34     // Ensure that only one keyset is provided through each operation
  35     dispatch_sync(self.queue, ^{
  36         if(!self.keyset) {
  37             self.keyset = keyset;
  38             if(self.startDependency) {
  39                 // Create a new queue here, just to be safe in case someone is waiting
  40                 NSOperationQueue* queue = [[NSOperationQueue alloc] init];
  41                 [queue addOperation:self.startDependency];
  42                 self.startDependency = nil;
  43             }
  44         }
  45     });
  46
  47 }
  48 @end
  49
  50 #endif // OCTAGON