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optimize traffic counter queries

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This commit is contained in:
Serge Paquet 2014-01-09 00:01:54 -05:00
parent d74a2c448f
commit cb695a1522
1 changed files with 15 additions and 7 deletions
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22
app/controllers/application_controller.rb
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@ -26,16 +26,24 @@ class ApplicationController < ActionController::Base
end
Keystore.transaction do
date = (Keystore.value_for("traffic:date") || Time.now.to_i)
traffic = (Keystore.incremented_value_for("traffic:hits", 0).
to_f / 100.0) + 1.0
now_i = Time.now.to_i
date_kv = Keystore.find_or_create_key_for_update("traffic:date", now_i)
traffic_kv = Keystore.find_or_create_key_for_update("traffic:hits", 0)
# increment traffic counter on each request
traffic = traffic_kv.value.to_i + 100
# every second, decrement traffic by some amount
@traffic = [ 1.0, traffic.to_f -
((Time.now.to_i - date) * TRAFFIC_DECREMENTER) ].max
traffic -= (100.0 * (now_i - date_kv.value) * TRAFFIC_DECREMENTER).to_i
# clamp
traffic = [ 100, traffic ].max
Keystore.put("traffic:date", Time.now.to_i)
Keystore.put("traffic:hits", (@traffic * 100.0).to_i)
@traffic = traffic * 0.01
traffic_kv.value = traffic
traffic_kv.save!
date_kv.value = now_i
date_kv.save!
end
Rails.logger.info " Traffic level: #{@traffic}"