1 files changed, 46 insertions, 1 deletions

diff --git a/platform/darwin/src/MGLNetworkConfiguration.m b/platform/darwin/src/MGLNetworkConfiguration.m
index 8262e7eea1..6f5959e70f 100644
--- a/platform/darwin/src/MGLNetworkConfiguration.m
+++ b/platform/darwin/src/MGLNetworkConfiguration.m
@@ -1,8 +1,15 @@
-#import "MGLNetworkConfiguration.h"
+#import "MGLNetworkConfiguration_Private.h"
+
+
+NSString * const kMGLDownloadPerformanceEvent = @"mobile.performance_trace";
+static NSString * const MGLStartTime = @"start_time";
+static NSString * const MGLResourceType = @"resource_type";
 
 @interface MGLNetworkConfiguration ()
 
 @property (strong) NSURLSessionConfiguration *sessionConfig;
+@property (nonatomic, strong) NSMutableDictionary<NSString *, NSDictionary*> *events;
+@property (nonatomic, weak, nullable) id<MGLNetworkEventDelegate> delegate;
 
 @end
 
@@ -14,6 +21,7 @@
     dispatch_once(&onceToken, ^{
         _sharedManager = [[self alloc] init];
         _sharedManager.sessionConfiguration = nil;
+        _sharedManager.events = [NSMutableDictionary dictionary];
     });
 
     return _sharedManager;
@@ -48,4 +56,41 @@
     return sessionConfiguration;
 }
 
+- (void)startDownloadEvent:(NSString *)urlString type:(NSString *)resourceType {
+    if (urlString && ![self.events objectForKey:urlString]) {
+        [self.events setObject:@{ MGLStartTime: [NSDate date], MGLResourceType: resourceType } forKey:urlString];
+    }
+}
+
+- (void)stopDownloadEvent:(NSString *)urlString {
+    if (urlString && [self.events objectForKey:urlString]) {
+        if ([self.delegate respondsToSelector:@selector(networkConfiguration:didReceiveNetworkEvent:)])
+        {
+            NSDictionary *parameters = [self.events objectForKey:urlString];
+            NSDate *startDate = [parameters objectForKey:MGLStartTime];
+            NSDate *endDate = [NSDate date];
+            NSTimeInterval elapsedTime = [endDate timeIntervalSinceDate:startDate];
+            NSDateFormatter* iso8601Formatter = [[NSDateFormatter alloc] init];
+            iso8601Formatter.dateFormat = @"yyyy-MM-dd'T'HH:mm:ssZ";
+            
+            NSDictionary *eventAttributes = @{
+                                              @"event" : kMGLDownloadPerformanceEvent,
+                                              @"created" : [iso8601Formatter stringFromDate:[NSDate date]],
+                                              @"sessionId" : [NSUUID UUID].UUIDString,
+                                              @"counters" : @[ @{ @"name" : @"elapsed_time" }, @{ @"value" : @(elapsedTime) } ],
+                                              @"attributes" : @[ @{ @"name" : @"resource" }, @{ @"value" : urlString },  ]
+                                              };
+            
+            [self.delegate networkConfiguration:self didReceiveNetworkEvent:eventAttributes];
+        }
+        [self.events removeObjectForKey:urlString];
+    }
+}
+
+- (void)cancelDownloadEvent:(NSString *)urlString {
+    if (urlString && [self.events objectForKey:urlString]) {
+        [self.events removeObjectForKey:urlString];
+    }
+}
+
 @end