kill redis connections

kill_idle_redis_connections.rb

for_real = false
idle_max = 86400

# redis_constant is a connection pool, the variable c is a single redis client
(clients = redis_constant.with { |c| c.method_missing("client", "list") }.split("\n")).nil?
(addrs = clients.
  # select idle clients
  select { |client_string| client_string.match(/idle=([\d|\.|:]*)/).captures.first.to_i > idle_max }.
  # return ip addresses
  map { |client_string| client_string.match(/addr=([\d|\.|:]*)/).captures.first }).nil?

puts "found #{addrs.length} clients with idle time over #{idle_max}"

if !!for_real
  killed_total = 0
  (addrs.each do |addr|
    killed_total += 1
    puts "killed #{killed_total} / #{addrs.length} so far.."
    redis_constant.with { |c| c.method_missing("client", "kill", addr) }
  end).nil?
end