Add logs for flushing data due to page hidden events

Author: EmilianoSanchez

src/listeners/browser.ts

@@ -9,7 +9,7 @@ import { ISettings } from '../types';
 import SplitIO from '../../types/splitio';
 import { ImpressionsPayload } from '../sync/submitters/types';
 import { objectAssign } from '../utils/lang/objectAssign';
-import { CLEANUP_REGISTERING, CLEANUP_DEREGISTERING } from '../logger/constants';
+import { CLEANUP_REGISTERING, CLEANUP_DEREGISTERING, SUBMITTERS_PUSH_PAGE_HIDDEN } from '../logger/constants';
 import { ISyncManager } from '../sync/types';
 import { isConsentGranted } from '../consent';
 
@@ -104,6 +104,7 @@ export class BrowserSignalListener implements ISignalListener {
       if (!this._sendBeacon(url, dataPayload, extraMetadata)) {
         postService(JSON.stringify(dataPayload)).catch(() => { }); // no-op to handle possible promise rejection
       }
+      this.settings.log.debug(SUBMITTERS_PUSH_PAGE_HIDDEN, [cache.name]);
     }
   }
 

src/logger/constants.ts

@@ -55,6 +55,7 @@ export const IMPRESSIONS_TRACKER_SUCCESS = 121;
 export const USER_CONSENT_UPDATED = 122;
 export const USER_CONSENT_NOT_UPDATED = 123;
 export const USER_CONSENT_INITIAL = 124;
+export const SUBMITTERS_PUSH_PAGE_HIDDEN = 125;
 
 export const ENGINE_VALUE_INVALID = 200;
 export const ENGINE_VALUE_NO_ATTRIBUTES = 201;

src/logger/messages/info.ts

@@ -25,6 +25,7 @@ export const codesInfo: [number, string][] = codesWarn.concat([
   [c.SYNC_SPLITS_FETCH_RETRY, c.LOG_PREFIX_SYNC_SPLITS + 'Retrying download of feature flags #%s. Reason: %s'],
   [c.SUBMITTERS_PUSH_FULL_QUEUE, c.LOG_PREFIX_SYNC_SUBMITTERS + 'Flushing full %s queue and resetting timer.'],
   [c.SUBMITTERS_PUSH, c.LOG_PREFIX_SYNC_SUBMITTERS + 'Pushing %s.'],
+  [c.SUBMITTERS_PUSH_PAGE_HIDDEN, c.LOG_PREFIX_SYNC_SUBMITTERS + 'Flushing %s because page became hidden.'],
   [c.STREAMING_REFRESH_TOKEN, c.LOG_PREFIX_SYNC_STREAMING + 'Refreshing streaming token in %s seconds, and connecting streaming in %s seconds.'],
   [c.STREAMING_RECONNECT, c.LOG_PREFIX_SYNC_STREAMING + 'Attempting to reconnect streaming in %s seconds.'],
   [c.STREAMING_CONNECTING, c.LOG_PREFIX_SYNC_STREAMING + 'Connecting streaming.'],