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   1 # Pleroma: A lightweight social networking server
   2 # Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
   3 # SPDX-License-Identifier: AGPL-3.0-only
   4
   5 defmodule Pleroma.Telemetry.Logger do
   6   @moduledoc "Transforms Pleroma telemetry events to logs"
   7
   8   require Logger
   9
  10   @events [
  11     [:pleroma, :connection_pool, :reclaim, :start],
  12     [:pleroma, :connection_pool, :reclaim, :stop],
  13     [:pleroma, :connection_pool, :provision_failure],
  14     [:pleroma, :connection_pool, :client, :dead],
  15     [:pleroma, :connection_pool, :client, :add]
  16   ]
  17   def attach do
  18     :telemetry.attach_many("pleroma-logger", @events, &handle_event/4, [])
  19   end
  20
  21   # Passing anonymous functions instead of strings to logger is intentional,
  22   # that way strings won't be concatenated if the message is going to be thrown
  23   # out anyway due to higher log level configured
  24
  25   def handle_event(
  26         [:pleroma, :connection_pool, :reclaim, :start],
  27         _,
  28         %{max_connections: max_connections, reclaim_max: reclaim_max},
  29         _
  30       ) do
  31     Logger.debug(fn ->
  32       "Connection pool is exhausted (reached #{max_connections} connections). Starting idle connection cleanup to reclaim as much as #{reclaim_max} connections"
  33     end)
  34   end
  35
  36   def handle_event(
  37         [:pleroma, :connection_pool, :reclaim, :stop],
  38         %{reclaimed_count: 0},
  39         _,
  40         _
  41       ) do
  42     Logger.error(fn ->
  43       "Connection pool failed to reclaim any connections due to all of them being in use. It will have to drop requests for opening connections to new hosts"
  44     end)
  45   end
  46
  47   def handle_event(
  48         [:pleroma, :connection_pool, :reclaim, :stop],
  49         %{reclaimed_count: reclaimed_count},
  50         _,
  51         _
  52       ) do
  53     Logger.debug(fn -> "Connection pool cleaned up #{reclaimed_count} idle connections" end)
  54   end
  55
  56   def handle_event(
  57         [:pleroma, :connection_pool, :provision_failure],
  58         %{opts: [key | _]},
  59         _,
  60         _
  61       ) do
  62     Logger.error(fn ->
  63       "Connection pool had to refuse opening a connection to #{key} due to connection limit exhaustion"
  64     end)
  65   end
  66
  67   def handle_event(
  68         [:pleroma, :connection_pool, :client, :dead],
  69         %{client_pid: client_pid, reason: reason},
  70         %{key: key},
  71         _
  72       ) do
  73     Logger.warn(fn ->
  74       "Pool worker for #{key}: Client #{inspect(client_pid)} died before releasing the connection with #{inspect(reason)}"
  75     end)
  76   end
  77
  78   def handle_event(
  79         [:pleroma, :connection_pool, :client, :add],
  80         %{clients: [_, _ | _] = clients},
  81         %{key: key, protocol: :http},
  82         _
  83       ) do
  84     Logger.info(fn ->
  85       "Pool worker for #{key}: #{length(clients)} clients are using an HTTP1 connection at the same time, head-of-line blocking might occur."
  86     end)
  87   end
  88
  89   def handle_event([:pleroma, :connection_pool, :client, :add], _, _, _), do: :ok
  90 end