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New Relic's Open-Source Elixir Agent
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lib/new_relic/sampler/ets.ex
defmodule NewRelic.Sampler.Ets do
use GenServer
@kb 1024
@word_size :erlang.system_info(:wordsize)
# Takes samples of the state of ETS tables
@moduledoc false
def start_link(_) do
GenServer.start_link(__MODULE__, :ok, name: __MODULE__)
end
def init(:ok) do
NewRelic.sample_process()
if NewRelic.Config.enabled?(),
do: Process.send_after(self(), :report, NewRelic.Sampler.Reporter.random_offset())
{:ok, %{}}
end
def handle_info(:report, state) do
record_sample()
Process.send_after(self(), :report, NewRelic.Sampler.Reporter.sample_cycle())
{:noreply, state}
end
def handle_call(:report, _from, state) do
record_sample()
{:reply, :ok, state}
end
def record_sample, do: Enum.map(named_tables(), &record_sample/1)
@size_threshold 500
def record_sample(table) do
case take_sample(table) do
:undefined -> :ignore
%{size: size} when size < @size_threshold -> :ignore
stat -> NewRelic.report_sample(:EtsStat, stat)
end
end
def named_tables, do: Enum.reject(:ets.all(), &is_reference/1)
defp take_sample(table) do
with words when is_number(words) <- :ets.info(table, :memory),
size when is_number(size) <- :ets.info(table, :size) do
%{table_name: inspect(table), memory_kb: round(words * @word_size) / @kb, size: size}
else
:undefined -> :undefined
end
end
end