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New Relic's Open-Source Elixir Agent
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Files
lib/new_relic/telemetry/ecto.ex
defmodule NewRelic.Telemetry.Ecto do
use GenServer
@moduledoc """
`NewRelic.Telemetry.Ecto` provides `Ecto` instrumentation via `telemetry`.
Repos are auto-discovered and instrumented. Make sure your Ecto app depends
on `new_relic_agent` so that the agent can detect when your Repos start.
We automatically gather:
* Datastore metrics
* Transaction Trace segments
* Transaction datastore attributes
* Distributed Trace span events
You can opt-out of this instrumentation as a whole and specifically of
SQL query collection via configuration. See `NewRelic.Config` for details.
"""
def start_link(repo: repo, opts: opts) do
config = %{
enabled?: NewRelic.Config.feature?(:ecto_instrumentation),
collect_db_query?: NewRelic.Config.feature?(:db_query_collection),
handler_id: {:new_relic_ecto, repo},
event: opts[:telemetry_prefix] ++ [:query],
opts: opts
}
GenServer.start_link(__MODULE__, config)
end
def init(%{enabled?: false}), do: :ignore
def init(%{enabled?: true} = config) do
:telemetry.attach(
config.handler_id,
config.event,
&NewRelic.Telemetry.Ecto.Handler.handle_event/4,
config
)
Process.flag(:trap_exit, true)
{:ok, config}
end
def terminate(_reason, %{handler_id: handler_id}) do
:telemetry.detach(handler_id)
end
end