Performs a raw incr for cache_key from server. Returns nil if not found.

Source Code

# File active_support/vendor/memcache-client-1.5.0/memcache.rb, line 636
def cache_incr(server, cache_key, amount)
  socket = server.socket
  socket.write "incr #{cache_key} #{amount}\r\n"
  text = socket.gets
  raise_on_error_response! text
  return nil if text == "NOT_FOUND\r\n"
  return text.to_i
end