56828abf6d
Although Jason readme says Phoenix 1.4+ already does it by default, [it actually does it only for new projects](3bfb9f6e90/lib/phoenix.ex (L58-L59))
65 lines
1.7 KiB
Elixir
65 lines
1.7 KiB
Elixir
# Pleroma: A lightweight social networking server
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# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
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# SPDX-License-Identifier: AGPL-3.0-only
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defmodule Pleroma.Healthcheck do
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@moduledoc """
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Module collects metrics about app and assign healthy status.
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"""
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alias Pleroma.Healthcheck
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alias Pleroma.Repo
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@derive Jason.Encoder
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defstruct pool_size: 0,
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active: 0,
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idle: 0,
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memory_used: 0,
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healthy: true
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@type t :: %__MODULE__{
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pool_size: non_neg_integer(),
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active: non_neg_integer(),
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idle: non_neg_integer(),
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memory_used: number(),
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healthy: boolean()
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}
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@spec system_info() :: t()
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def system_info do
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%Healthcheck{
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memory_used: Float.round(:erlang.memory(:total) / 1024 / 1024, 2)
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}
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|> assign_db_info()
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|> check_health()
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end
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defp assign_db_info(healthcheck) do
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database = Pleroma.Config.get([Repo, :database])
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query =
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"select state, count(pid) from pg_stat_activity where datname = '#{database}' group by state;"
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result = Repo.query!(query)
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pool_size = Pleroma.Config.get([Repo, :pool_size])
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db_info =
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Enum.reduce(result.rows, %{active: 0, idle: 0}, fn [state, cnt], states ->
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if state == "active" do
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Map.put(states, :active, states.active + cnt)
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else
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Map.put(states, :idle, states.idle + cnt)
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end
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end)
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|> Map.put(:pool_size, pool_size)
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Map.merge(healthcheck, db_info)
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end
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@spec check_health(Healthcheck.t()) :: Healthcheck.t()
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def check_health(%{pool_size: pool_size, active: active} = check)
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when active >= pool_size do
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%{check | healthy: false}
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end
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def check_health(check), do: check
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end
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