gistfile1.m

- (void)_getProductsById:(NSSet *)productIDs
{
    NSAssert(self.requestingProducts, @"Should be busy from previous method (getProductsWithCompletion)");
    NSAssert(self.productRequest == nil, @"logic");
    
    EALog(@"Getting items: %@", productIDs);
    
    SKProductsRequest *productRequest = [[SKProductsRequest alloc] initWithProductIdentifiers:productIDs];
    
    [productRequest setDelegate:self];

    [productRequest start];
    
    
    self.productRequest = productRequest;
    
    EALog(@"Starting request for products");
    
}

#pragma mark -
#pragma mark SKProductRequest Protocols

- (void)productsRequest:(SKProductsRequest *)request didReceiveResponse:(SKProductsResponse *)response {
    
    NSCAssert([NSThread isMainThread], @"Require main thread");
    NSParameterAssert(self.productRequest); // should be pending
    
    EALog(@"Response to Product Request from Apple:\nValid Products:\n%@",response.products);
    
    if ( response.invalidProductIdentifiers.count > 0 ) {
        EAWarning(@"Invalid product identifiers: %@", response.invalidProductIdentifiers);
    }
    
    NSMutableDictionary *validProducts = [NSMutableDictionary dictionary];
    
    // find the valid products
    if ( response.products ) {
        
        for (SKProduct *product in response.products) {
            
            [validProducts setObject:product
                              forKey:product.productIdentifier];
        }
    }
    
    
    NSMutableDictionary *mergedProductsHash = [NSMutableDictionary new];
    
    // merge the price info from valid products with the meta info from the Evil Apples server
    [self.productsReturnedFromServer enumerateObjectsUsingBlock:^(NSDictionary *productInfoFromEAServer, NSUInteger idx, BOOL *stop) {
        
        NSString *pid = [productInfoFromEAServer objectForKey:@"id" ofClass:@"NSString"];
        SKProduct *appleProduct = [validProducts objectForKey:pid];
        if ( appleProduct ) {
            NSMutableDictionary *mergedProduct = [productInfoFromEAServer mutableCopy];
            [mergedProduct setObject:appleProduct forKey:@"SKProduct"];
            [mergedProductsHash setObject:mergedProduct forKey:pid];
        }
        
    }];
    
    // use productRequest to prevent multiple requests
    self.productRequest = nil;
    
    // TODO: Handle errors! Where is a SKProductRequest error handled?!
    [self _productRequestSuccess:mergedProductsHash];
}

- (void)request:(SKRequest *)request didFailWithError:(NSError *)error
{
    EALog(@"SKRequest Error = %@", error);
    if ( [request isKindOfClass:[SKProductsRequest class]] ) {
        NSAssert([request isEqual:self.productRequest], @"These should be the same because we only allow 1 products request at a time");
        self.productRequest = nil;
        [self _productRequestFailed:error];
    }
}