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# Pleroma: A lightweight social networking server
# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.JobQueueMonitor do
use GenServer
@initial_state %{workers: %{}, queues: %{}, processed_jobs: 0}
@queue %{processed_jobs: 0, success: 0, failure: 0}
@operation %{processed_jobs: 0, success: 0, failure: 0}
def start_link(_) do
GenServer.start_link(__MODULE__, @initial_state, name: __MODULE__)
end
@impl true
def init(state) do
:telemetry.attach("oban-monitor-failure", [:oban, :job, :exception], &handle_event/4, nil)
:telemetry.attach("oban-monitor-success", [:oban, :job, :stop], &handle_event/4, nil)
{:ok, state}
end
def stats do
GenServer.call(__MODULE__, :stats)
end
def handle_event([:oban, :job, event], %{duration: duration}, meta, _) do
GenServer.cast(
__MODULE__,
{:process_event, mapping_status(event), duration, meta}
)
end
@impl true
def handle_call(:stats, _from, state) do
{:reply, state, state}
end
@impl true
def handle_cast({:process_event, status, duration, meta}, state) do
state =
state
|> Map.update!(:workers, fn workers ->
workers
|> Map.put_new(meta.worker, %{})
|> Map.update!(meta.worker, &update_worker(&1, status, meta, duration))
end)
|> Map.update!(:queues, fn workers ->
workers
|> Map.put_new(meta.queue, @queue)
|> Map.update!(meta.queue, &update_queue(&1, status, meta, duration))
end)
|> Map.update!(:processed_jobs, &(&1 + 1))
{:noreply, state}
end
defp update_worker(worker, status, meta, duration) do
worker
|> Map.put_new(meta.args["op"], @operation)
|> Map.update!(meta.args["op"], &update_op(&1, status, meta, duration))
end
defp update_op(op, :enqueue, _meta, _duration) do
op
|> Map.update!(:enqueued, &(&1 + 1))
end
defp update_op(op, status, _meta, _duration) do
op
|> Map.update!(:processed_jobs, &(&1 + 1))
|> Map.update!(status, &(&1 + 1))
end
defp update_queue(queue, status, _meta, _duration) do
queue
|> Map.update!(:processed_jobs, &(&1 + 1))
|> Map.update!(status, &(&1 + 1))
end
defp mapping_status(:stop), do: :success
defp mapping_status(:exception), do: :failure
end
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