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akkoma/lib/healthcheck.ex
2019-04-22 07:19:53 +00:00

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Elixir

defmodule Pleroma.Healthcheck do
@moduledoc """
Module collects metrics about app and assign healthy status.
"""
alias Pleroma.Healthcheck
alias Pleroma.Repo
defstruct pool_size: 0,
active: 0,
idle: 0,
memory_used: 0,
healthy: true
@type t :: %__MODULE__{
pool_size: non_neg_integer(),
active: non_neg_integer(),
idle: non_neg_integer(),
memory_used: number(),
healthy: boolean()
}
@spec system_info() :: t()
def system_info do
%Healthcheck{
memory_used: Float.round(:erlang.memory(:total) / 1024 / 1024, 2)
}
|> assign_db_info()
|> check_health()
end
defp assign_db_info(healthcheck) do
database = Application.get_env(:pleroma, Repo)[:database]
query =
"select state, count(pid) from pg_stat_activity where datname = '#{database}' group by state;"
result = Repo.query!(query)
pool_size = Application.get_env(:pleroma, Repo)[:pool_size]
db_info =
Enum.reduce(result.rows, %{active: 0, idle: 0}, fn [state, cnt], states ->
if state == "active" do
Map.put(states, :active, states.active + cnt)
else
Map.put(states, :idle, states.idle + cnt)
end
end)
|> Map.put(:pool_size, pool_size)
Map.merge(healthcheck, db_info)
end
@spec check_health(Healthcheck.t()) :: Healthcheck.t()
def check_health(%{pool_size: pool_size, active: active} = check)
when active >= pool_size do
%{check | healthy: false}
end
def check_health(check), do: check
end