Tracking cold restarts

A cold restart is when an app is closed (swipe away) and relaunched within 30 seconds. In this scenario we currently won't call onSession. We want to track how often this occurs to know the impact of calling onSession in this scenario.

We don't want to consider backgrounding in this case so we are using the registerUserFinished boolean to remove cases where we have already registered a session. We also only want to track this once per app launch so the trackedColdRestart boolean prevents it from being called multiple times.

Author: emawby

iOS_SDK/OneSignalSDK/Source/OneSignal.m

@@ -1678,6 +1678,7 @@ + (BOOL)isRegisterUserSuccessful {
     return _registerUserSuccessful || isOnSessionSuccessfulForCurrentState;
 }
 
+static BOOL _trackedColdRestart = false;
 + (BOOL)shouldRegisterNow {
     // return if the user has not granted privacy permissions
     if ([self shouldLogMissingPrivacyConsentErrorWithMethodName:nil])
@@ -1709,11 +1710,14 @@ + (BOOL)shouldRegisterNow {
     // Make sure last time we closed app was more than 30 secs ago
     const int minTimeThreshold = 30;
     NSTimeInterval delta = now - lastTimeClosed;
-    if (delta < minTimeThreshold && appId) {
-        // https://api.onesignal.com/api/v1/track
-        // do track here
-        // OS-Usage-Data
-        NSLog(@"ECM tracking restart appId: %@", appId);
+    if (delta < minTimeThreshold && appId && !_registerUserFinished && !_trackedColdRestart) {
+        NSString *osUsageData = [NSString stringWithFormat:@"lib-name=OneSignal-iOS-SDK,lib-version=%@,lib-event=cold_restart", ONESIGNAL_VERSION];
+        _trackedColdRestart = true;
+        [[OneSignalClient sharedClient] executeRequest:[OSRequestTrackV1 trackUsageData:osUsageData appId:appId] onSuccess:^(NSDictionary *result) {
+            [OneSignal onesignal_Log:ONE_S_LL_VERBOSE message:@"shouldRegisterNow:trackColdRestart: successfully tracked cold restart"];
+        } onFailure:^(NSError *error) {
+            [OneSignal onesignal_Log:ONE_S_LL_ERROR message:[NSString stringWithFormat:@"shouldRegisterNow:trackColdRestart: Failed to track cold restart: %@", error.localizedDescription]];
+        }];
     }
     return delta >= minTimeThreshold;
 }