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new_relic_agent
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1.0.0
New Relic's Open-Source Elixir Agent
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lib/new_relic/signal_handler.ex
defmodule NewRelic.SignalHandler do
@moduledoc false
@behaviour :gen_event
# This signal handler exists so that we can shut down
# the NewRelic.Sampler.Beam process asap to avoid a race
# condition that can happen while `cpu_sup` shuts down
def start do
case Process.whereis(:erl_signal_server) do
:undefined ->
:ok
_ ->
# Get our signal handler installed before erlang's
:gen_event.delete_handler(:erl_signal_server, :erl_signal_handler, :ok)
:gen_event.add_handler(:erl_signal_server, __MODULE__, [])
:gen_event.add_handler(:erl_signal_server, :erl_signal_handler, [])
end
end
def init(_) do
{:ok, %{}}
end
def handle_event(:sigterm, state) do
Process.whereis(NewRelic.Sampler.Beam) &&
GenServer.stop(NewRelic.Sampler.Beam)
{:ok, state}
end
def handle_event(_, state) do
{:ok, state}
end
def handle_call(_, state) do
{:ok, :ok, state}
end
def handle_info(_, state) do
{:ok, state}
end
def terminate(_reason, _state) do
:ok
end
def code_change(_old, state, _extra) do
{:ok, state}
end
end