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   1 # Pleroma: A lightweight social networking server
   2 # Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
   3 # SPDX-License-Identifier: AGPL-3.0-only
   4
   5 defmodule Pleroma.Healthcheck do
   6   @moduledoc """
   7   Module collects metrics about app and assign healthy status.
   8   """
   9   alias Pleroma.Healthcheck
  10   alias Pleroma.Repo
  11
  12   @derive Jason.Encoder
  13   defstruct pool_size: 0,
  14             active: 0,
  15             idle: 0,
  16             memory_used: 0,
  17             job_queue_stats: nil,
  18             healthy: true
  19
  20   @type t :: %__MODULE__{
  21           pool_size: non_neg_integer(),
  22           active: non_neg_integer(),
  23           idle: non_neg_integer(),
  24           memory_used: number(),
  25           job_queue_stats: map(),
  26           healthy: boolean()
  27         }
  28
  29   @spec system_info() :: t()
  30   def system_info do
  31     %Healthcheck{
  32       memory_used: Float.round(:recon_alloc.memory(:allocated) / 1024 / 1024, 2)
  33     }
  34     |> assign_db_info()
  35     |> assign_job_queue_stats()
  36     |> check_health()
  37   end
  38
  39   defp assign_db_info(healthcheck) do
  40     database = Pleroma.Config.get([Repo, :database])
  41
  42     query =
  43       "select state, count(pid) from pg_stat_activity where datname = '#{database}' group by state;"
  44
  45     result = Repo.query!(query)
  46     pool_size = Pleroma.Config.get([Repo, :pool_size])
  47
  48     db_info =
  49       Enum.reduce(result.rows, %{active: 0, idle: 0}, fn [state, cnt], states ->
  50         if state == "active" do
  51           Map.put(states, :active, states.active + cnt)
  52         else
  53           Map.put(states, :idle, states.idle + cnt)
  54         end
  55       end)
  56       |> Map.put(:pool_size, pool_size)
  57
  58     Map.merge(healthcheck, db_info)
  59   end
  60
  61   defp assign_job_queue_stats(healthcheck) do
  62     stats = Pleroma.JobQueueMonitor.stats()
  63     Map.put(healthcheck, :job_queue_stats, stats)
  64   end
  65
  66   @spec check_health(Healthcheck.t()) :: Healthcheck.t()
  67   def check_health(%{pool_size: pool_size, active: active} = check)
  68       when active >= pool_size do
  69     %{check | healthy: false}
  70   end
  71
  72   def check_health(check), do: check
  73 end