discourse/app/models/concerns/stats_cacheable.rb

42 lines
997 B
Ruby

# frozen_string_literal: true
module StatsCacheable
extend ActiveSupport::Concern
module ClassMethods
def stats_cache_key
raise 'Stats cache key has not been set.'
end
def fetch_stats
raise 'Not implemented.'
end
# Could be configurable, multisite need to support it.
def recalculate_stats_interval
30 # minutes
end
def fetch_cached_stats
# The scheduled Stats job is responsible for generating and caching this.
stats = $redis.get(stats_cache_key)
stats = refresh_stats if !stats
JSON.parse(stats).with_indifferent_access
end
def refresh_stats
stats = fetch_stats.to_json
set_cache(stats)
stats
end
private
def set_cache(stats)
# Add some extra time to the expiry so that the next job run has plenty of time to
# finish before previous cached value expires.
$redis.setex stats_cache_key, (recalculate_stats_interval + 5).minutes, stats
end
end
end