Limit livestream fetches when failed

We were already limiting the call to once-per-5-minutes (for the succesful case), so just need to put failure cases into the mix.

Retry 3 times before stopping.

flow-typed/livestream.js

@@ -28,6 +28,7 @@ declare type LivestreamState = {
   activeLivestreams: ?LivestreamInfo,
   activeLivestreamsLastFetchedDate: number,
   activeLivestreamsLastFetchedOptions: {},
+  activeLivestreamsLastFetchedFailCount: number,
   activeLivestreamInitialized: boolean,
   socketConnectionById: { [id: string]: { connected: ?boolean, sub_category: ?string } },
 };

ui/redux/actions/livestream.js

@@ -168,10 +168,13 @@ export const doFetchActiveLivestreams = (
   const nextOptions = { order_by: orderBy, ...(lang ? { any_languages: lang } : {}) };
   const sameOptions = JSON.stringify(prevOptions) === JSON.stringify(nextOptions);
 
-  // already fetched livestreams within the interval, skip for now
   if (sameOptions && timeDelta < FETCH_ACTIVE_LIVESTREAMS_MIN_INTERVAL_MS) {
-    dispatch({ type: ACTIONS.FETCH_ACTIVE_LIVESTREAMS_SKIPPED });
+    const failCount = state.livestream.activeLivestreamsLastFetchedFailCount;
-    return;
+    if (failCount === 0 || failCount > 3) {
+      // Just fetched successfully, or failed 3 times. Skip for FETCH_ACTIVE_LIVESTREAMS_MIN_INTERVAL_MS.
+      dispatch({ type: ACTIONS.FETCH_ACTIVE_LIVESTREAMS_SKIPPED });
+      return;
+    }
   }
 
   // start fetching livestreams
@@ -207,6 +210,12 @@ export const doFetchActiveLivestreams = (
       },
     });
   } catch (err) {
-    dispatch({ type: ACTIONS.FETCH_ACTIVE_LIVESTREAMS_FAILED });
+    dispatch({
+      type: ACTIONS.FETCH_ACTIVE_LIVESTREAMS_FAILED,
+      data: {
+        activeLivestreamsLastFetchedDate: now,
+        activeLivestreamsLastFetchedOptions: nextOptions,
+      },
+    });
   }
 };

ui/redux/reducers/livestream.js

@@ -10,6 +10,7 @@ const defaultState: LivestreamState = {
   activeLivestreams: null,
   activeLivestreamsLastFetchedDate: 0,
   activeLivestreamsLastFetchedOptions: {},
+  activeLivestreamsLastFetchedFailCount: 0,
   activeLivestreamInitialized: false,
   socketConnectionById: {},
 };
@@ -62,8 +63,15 @@ export default handleActions(
     [ACTIONS.FETCH_ACTIVE_LIVESTREAMS_STARTED]: (state: LivestreamState) => {
       return { ...state, fetchingActiveLivestreams: true };
     },
-    [ACTIONS.FETCH_ACTIVE_LIVESTREAMS_FAILED]: (state: LivestreamState) => {
+    [ACTIONS.FETCH_ACTIVE_LIVESTREAMS_FAILED]: (state: LivestreamState, action: any) => {
-      return { ...state, fetchingActiveLivestreams: false };
+      const { activeLivestreamsLastFetchedDate, activeLivestreamsLastFetchedOptions } = action.data;
+      return {
+        ...state,
+        fetchingActiveLivestreams: false,
+        activeLivestreamsLastFetchedDate,
+        activeLivestreamsLastFetchedOptions,
+        activeLivestreamsLastFetchedFailCount: state.activeLivestreamsLastFetchedFailCount + 1,
+      };
     },
     [ACTIONS.FETCH_ACTIVE_LIVESTREAMS_COMPLETED]: (state: LivestreamState, action: any) => {
       const { activeLivestreams, activeLivestreamsLastFetchedDate, activeLivestreamsLastFetchedOptions } = action.data;
@@ -73,6 +81,7 @@ export default handleActions(
         activeLivestreams,
         activeLivestreamsLastFetchedDate,
         activeLivestreamsLastFetchedOptions,
+        activeLivestreamsLastFetchedFailCount: 0,
         viewersById: updateViewersById(activeLivestreams, state.viewersById),
       };
     },