Retrieving elements from ordered set that were updated in given time interval

[janko]

We use an ordered set for registering heartbeats of devices connected to our backend via websockets. Discovering that Kredis stores scores as float timestamps, I realized I could use ZRANGE to retrieve device IDs that have either recent or stale heartbeat:

heartbeats = Kredis.ordered_set("devices:heartbeats")
heartbeats.zrange("-inf", 1.minute.ago.to_f, byscore: true) # returns device IDs with stale heartbeat
heartbeats.zrange(1.minute.ago.to_f, "+inf", byscore: true) # returns device IDs with recent heartbeat

I recently created a helper method that accepts a time range to make this easier:

def heartbeat_ids(range)
  from = range.begin&.to_f || "-inf"
  to = range.end&.to_f || "+inf"

  heartbeats = Kredis.ordered_set("devices:heartbeats")
  heartbeats.zrange(from, to, byscore: true)
end

heartbeat_ids(...1.minute.ago) # stale heartbeats
heartbeat_ids(1.minute.ago..) # recent heartbeats

I was wondering whether there is interest in adding a similar method to Kredis::OrderedSet, or make #elements accept an optional time range.

[maxim]

@janko Looks convenient and appropriate for this type in my view.

Half-relatedly, I wonder if Basecamp is still using Redis and Kredis internally, and whether this gem still makes sense for their team to maintain? 🤔