private async Task <long> GetDirectMessages_Received_Backfill()
{
long smallestid = 0;
long largestid = 0;
int backfillQuota = 50;
int backofftimer = 30;
do
{
var dmrecd = await UserSession.GetDirectMessages(count : _pagingSize, maxId : smallestid);
if (dmrecd.OK)
{
smallestid = long.MaxValue;
// if the Count of items returned is less than the backfill quota, we have run out of messages.
// this will decrement the backfill quota to zero, falling out of the loop
if (dmrecd.Count < backfillQuota)
{
backfillQuota = dmrecd.Count;
}
foreach (var dm in dmrecd)
{
_directmessages.OnNext(dm);
if (dm.Id < smallestid)
{
smallestid = dm.Id;
}
if (dm.Id > largestid)
{
largestid = dm.Id;
}
backfillQuota--;
}
await Task.Delay(_multiFetchBackoffTimer);
}
else
{
// The Backoff will trigger 7 times before just giving up
// once at 30s, 60s, 1m, 2m, 4m, 8m and then 16m
// note that the last call into this will be 1m above the 15 "rate limit reset" window
await Task.Delay(TimeSpan.FromSeconds(backofftimer));
if (backofftimer > _maxbackoff)
{
break;
}
backofftimer = backofftimer * 2;
}
} while (backfillQuota > 0);
return(largestid);
}
private async Task <long> GetDirectMessages_Received_Failover(long sinceid)
{
var largestseenid = sinceid;
var dmrecd = await UserSession.GetDirectMessages(count : _pagingSize, sinceId : sinceid);
if (!dmrecd.OK)
{
return(largestseenid);
}
foreach (var dm in dmrecd.Where(dm => dm.Id > sinceid))
{
largestseenid = dm.Id;
_directmessages.OnNext(dm);
}
return(largestseenid);
}