Merge branch 'featrue/job-monitor' into 'develop'

Add Pleroma.JobQueueMonitor

Closes #1274

See merge request pleroma/pleroma!1721

7 files changed, 171 insertions, 5 deletions

diff --git a/CHANGELOG.md b/CHANGELOG.md
index f677611c9..6ebc46b7d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 ## [Unreleased]
 ### Added
 - Refreshing poll results for remote polls
+- Job queue stats to the healthcheck page
 - Admin API: Add ability to require password reset
 - Mastodon API: Account entities now include `follow_requests_count` (planned Mastodon 3.x addition)
 - Pleroma API: `GET /api/v1/pleroma/accounts/:id/scrobbles` to get a list of recently scrobbled items
diff --git a/docs/API/pleroma_api.md b/docs/API/pleroma_api.md
index 3a8ef4e2c..0517bbdd7 100644
--- a/docs/API/pleroma_api.md
+++ b/docs/API/pleroma_api.md
@@ -317,7 +317,8 @@ See [Admin-API](admin_api.md)
   "active": 0, # active processes
   "idle": 0, # idle processes
   "memory_used": 0.00, # Memory used
-  "healthy": true # Instance state
+  "healthy": true, # Instance state
+  "job_queue_stats": {} # Job queue stats
 }
 ```
 
@@ -391,7 +392,7 @@ The status posting endpoint takes an additional parameter, `in_reply_to_conversa
 ### Update a file in a custom emoji pack
 * Method `POST`
 * Authentication: required
-* Params: 
+* Params:
     * if the `action` is `add`, adds an emoji named `shortcode` to the pack `pack_name`,
       that means that the emoji file needs to be uploaded with the request
       (thus requiring it to be a multipart request) and be named `file`.
@@ -408,7 +409,7 @@ The status posting endpoint takes an additional parameter, `in_reply_to_conversa
 ### Updates (replaces) pack metadata
 * Method `POST`
 * Authentication: required
-* Params: 
+* Params:
   * `new_data`: new metadata to replace the old one
 * Response: JSON, updated "metadata" section of the pack and 200 status or 400 if there was a
   problem with the new metadata (the error is specified in the "error" part of the response JSON)
@@ -417,7 +418,7 @@ The status posting endpoint takes an additional parameter, `in_reply_to_conversa
 ### Requests the instance to download the pack from another instance
 * Method `POST`
 * Authentication: required
-* Params: 
+* Params:
   * `instance_address`: the address of the instance to download from
   * `pack_name`: the pack to download from that instance
 * Response: JSON, "ok" and 200 status if the pack was downloaded, or 500 if there were
diff --git a/lib/pleroma/application.ex b/lib/pleroma/application.ex
index 9e35b02c0..0bf218bc7 100644
--- a/lib/pleroma/application.ex
+++ b/lib/pleroma/application.ex
@@ -42,6 +42,7 @@ defmodule Pleroma.Application do
         hackney_pool_children() ++
         [
           Pleroma.Stats,
+          Pleroma.JobQueueMonitor,
           {Oban, Pleroma.Config.get(Oban)}
         ] ++
         task_children(@env) ++
diff --git a/lib/pleroma/healthcheck.ex b/lib/pleroma/healthcheck.ex
index 977b78c26..fc2129815 100644
--- a/lib/pleroma/healthcheck.ex
+++ b/lib/pleroma/healthcheck.ex
@@ -14,6 +14,7 @@ defmodule Pleroma.Healthcheck do
             active: 0,
             idle: 0,
             memory_used: 0,
+            job_queue_stats: nil,
             healthy: true
 
   @type t :: %__MODULE__{
@@ -21,6 +22,7 @@ defmodule Pleroma.Healthcheck do
           active: non_neg_integer(),
           idle: non_neg_integer(),
           memory_used: number(),
+          job_queue_stats: map(),
           healthy: boolean()
         }
 
@@ -30,6 +32,7 @@ defmodule Pleroma.Healthcheck do
       memory_used: Float.round(:erlang.memory(:total) / 1024 / 1024, 2)
     }
     |> assign_db_info()
+    |> assign_job_queue_stats()
     |> check_health()
   end
 
@@ -55,6 +58,11 @@ defmodule Pleroma.Healthcheck do
     Map.merge(healthcheck, db_info)
   end
 
+  defp assign_job_queue_stats(healthcheck) do
+    stats = Pleroma.JobQueueMonitor.stats()
+    Map.put(healthcheck, :job_queue_stats, stats)
+  end
+
   @spec check_health(Healthcheck.t()) :: Healthcheck.t()
   def check_health(%{pool_size: pool_size, active: active} = check)
       when active >= pool_size do
diff --git a/lib/pleroma/job_queue_monitor.ex b/lib/pleroma/job_queue_monitor.ex
new file mode 100644
index 000000000..3feea8381
--- /dev/null
+++ b/lib/pleroma/job_queue_monitor.ex
@@ -0,0 +1,78 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2019 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, :failure], &handle_event/4, nil)
+    :telemetry.attach("oban-monitor-success", [:oban, :success], &handle_event/4, nil)
+
+    {:ok, state}
+  end
+
+  def stats do
+    GenServer.call(__MODULE__, :stats)
+  end
+
+  def handle_event([:oban, status], %{duration: duration}, meta, _) do
+    GenServer.cast(__MODULE__, {:process_event, status, 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
+end
diff --git a/test/healthcheck_test.exs b/test/healthcheck_test.exs
index 6bb8d5b7f..66d5026ff 100644
--- a/test/healthcheck_test.exs
+++ b/test/healthcheck_test.exs
@@ -9,7 +9,14 @@ defmodule Pleroma.HealthcheckTest do
   test "system_info/0" do
     result = Healthcheck.system_info() |> Map.from_struct()
 
-    assert Map.keys(result) == [:active, :healthy, :idle, :memory_used, :pool_size]
+    assert Map.keys(result) == [
+             :active,
+             :healthy,
+             :idle,
+             :job_queue_stats,
+             :memory_used,
+             :pool_size
+           ]
   end
 
   describe "check_health/1" do
diff --git a/test/job_queue_monitor_test.exs b/test/job_queue_monitor_test.exs
new file mode 100644
index 000000000..17c6f3246
--- /dev/null
+++ b/test/job_queue_monitor_test.exs
@@ -0,0 +1,70 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.JobQueueMonitorTest do
+  use ExUnit.Case, async: true
+
+  alias Pleroma.JobQueueMonitor
+
+  @success {:process_event, :success, 1337,
+            %{
+              args: %{"op" => "refresh_subscriptions"},
+              attempt: 1,
+              id: 339,
+              max_attempts: 5,
+              queue: "federator_outgoing",
+              worker: "Pleroma.Workers.SubscriberWorker"
+            }}
+
+  @failure {:process_event, :failure, 22_521_134,
+            %{
+              args: %{"op" => "force_password_reset", "user_id" => "9nJG6n6Nbu7tj9GJX6"},
+              attempt: 1,
+              error: %RuntimeError{message: "oops"},
+              id: 345,
+              kind: :exception,
+              max_attempts: 1,
+              queue: "background",
+              stack: [
+                {Pleroma.Workers.BackgroundWorker, :perform, 2,
+                 [file: 'lib/pleroma/workers/background_worker.ex', line: 31]},
+                {Oban.Queue.Executor, :safe_call, 1,
+                 [file: 'lib/oban/queue/executor.ex', line: 42]},
+                {:timer, :tc, 3, [file: 'timer.erl', line: 197]},
+                {Oban.Queue.Executor, :call, 2, [file: 'lib/oban/queue/executor.ex', line: 23]},
+                {Task.Supervised, :invoke_mfa, 2, [file: 'lib/task/supervised.ex', line: 90]},
+                {:proc_lib, :init_p_do_apply, 3, [file: 'proc_lib.erl', line: 249]}
+              ],
+              worker: "Pleroma.Workers.BackgroundWorker"
+            }}
+
+  test "stats/0" do
+    assert %{processed_jobs: _, queues: _, workers: _} = JobQueueMonitor.stats()
+  end
+
+  test "handle_cast/2" do
+    state = %{workers: %{}, queues: %{}, processed_jobs: 0}
+
+    assert {:noreply, state} = JobQueueMonitor.handle_cast(@success, state)
+    assert {:noreply, state} = JobQueueMonitor.handle_cast(@failure, state)
+    assert {:noreply, state} = JobQueueMonitor.handle_cast(@success, state)
+    assert {:noreply, state} = JobQueueMonitor.handle_cast(@failure, state)
+
+    assert state == %{
+             processed_jobs: 4,
+             queues: %{
+               "background" => %{failure: 2, processed_jobs: 2, success: 0},
+               "federator_outgoing" => %{failure: 0, processed_jobs: 2, success: 2}
+             },
+             workers: %{
+               "Pleroma.Workers.BackgroundWorker" => %{
+                 "force_password_reset" => %{failure: 2, processed_jobs: 2, success: 0}
+               },
+               "Pleroma.Workers.SubscriberWorker" => %{
+                 "refresh_subscriptions" => %{failure: 0, processed_jobs: 2, success: 2}
+               }
+             }
+           }
+  end
+end