retry behaviour

lib/pleroma/broadway.ex

@@ -4,6 +4,9 @@ defmodule Pleroma.Broadway do
   require Logger
 
   @queue "akkoma"
+  @exchange "akkoma_exchange"
+  @retry_header "x-retries"
+  @delay_header "x-delay"
 
   def start_link(_args) do
     Broadway.start_link(__MODULE__,
@@ -12,16 +15,9 @@ def start_link(_args) do
         module:
           {BroadwayRabbitMQ.Producer,
            queue: @queue,
-           declare: [
-             durable: true,
-             auto_delete: false,
-             exclusive: true,
-             arguments: [
-              {"x-delayed-type", "direct"}
-             ]
-           ],
-            on_failure: :reject_and_requeue
-        }
+           after_connect: &declare_rabbitmq/1,
+           metadata: [:routing_key, :headers],
+           on_failure: :reject}
       ],
       processors: [
         default: [
@@ -38,23 +34,61 @@ def start_link(_args) do
     )
   end
 
+  defp declare_rabbitmq(amqp_channel) do
+    declare_exchanges(amqp_channel)
+    declare_queues(amqp_channel)
+    declare_bindings(amqp_channel)
+  end
+
+  defp declare_exchanges(amqp_channel) do
+    # Main exchange, all messages go here
+    :ok =
+      AMQP.Exchange.declare(amqp_channel, @exchange, :"x-delayed-message",
+        durable: true,
+        arguments: [{"x-delayed-type", :longstr, "topic"}]
+      )
+  end
+
+  defp declare_queues(amqp_channel) do
+    # Main queue, bound to main exchange
+    {:ok, _} = AMQP.Queue.declare(amqp_channel, @queue, durable: true)
+  end
+
+  defp declare_bindings(amqp_channel) do
+    :ok = AMQP.Queue.bind(amqp_channel, @queue, @exchange, routing_key: "#")
+  end
+
+  defp retry_count(:undefined), do: 0
+  defp retry_count(headers) do
+    match = Enum.find(headers, fn {k, _t, _v} -> k == @retry_header end)
+    if is_nil(match) do
+      0
+    else
+      elem(match, 2)
+    end
+  end
+
   @impl true
-  def handle_message(_, %Message{data: data} = message, _) do
+  def handle_message(_, %Message{data: data, metadata: %{routing_key: routing_key, headers: headers}} = message, _) do
+    Logger.debug("Received message on #{routing_key}")
     with {:ok, data} <- Jason.decode(data),
          {module, data} <- Map.pop(data, "__module__"),
          module <- String.to_existing_atom(module),
          :ok <- perform_message(module, data) do
-      Logger.debug("Received message: #{inspect(data)}")
       message
     else
       err ->
-        IO.inspect(err)
+        retries = retry_count(headers)
+        if retries > 5 do
           Message.failed(message, err)
+        else
+          {:ok, _} = produce(routing_key, data, scheduled_in: 5000, retry_count: retries + 1)
+          message
+        end
     end
   end
 
   defp perform_message(module, args) do
-    IO.inspect(args)
     case module.perform(%Oban.Job{args: args}) do
       :ok ->
         :ok
@@ -74,7 +108,12 @@ def handle_batch(_, batch, _, _) do
 
   @impl true
   def handle_failed(messages, _) do
-    Logger.error("Failed messages: #{inspect(messages)}")
+    for message <- messages do
+      %Message{data: data, metadata: %{routing_key: topic}, status: {:failed, reason}} = message
+      {:ok, %{"op" => op}} = Jason.decode(data)
+      Logger.error("Processing task on #{topic}(#{op}) failed: #{inspect(reason)}")
+    end
+
     messages
   end
 
@@ -87,35 +126,65 @@ def children do
     [Pleroma.Broadway]
   end
 
-  defp maybe_add_headers([headers: headers] = opts, key, value) when is_list(headers) do
-    Keyword.put(opts, :headers, [{key, value} | headers])
-  end
-  defp maybe_add_headers(opts, key, value) do
-    Keyword.put(opts, :headers, [{key, value}])
+  defp add_headers([headers: headers] = opts, key, type, value) when is_list(headers) do
+    Keyword.put(opts, :headers, [{key, type, value} | headers])
   end
 
-  defp maybe_with_priority(opts, [priority: priority]) when is_integer(priority) do
-    Keyword.put(opts, :priority, priority)
+  defp add_headers(opts, key, type, value) do
+    Keyword.put(opts, :headers, [{key, type, value}])
   end
-  defp maybe_with_priority(opts, _), do: opts
 
-  defp maybe_with_delay(opts, [scheduled_at: scheduled_at]) do
-    time_in_ms = DateTime.diff(DateTime.utc_now(), scheduled_at)
+  defp maybe_with_priority(opts, params) do
+    if !is_nil(params[:priority]) do
+      Keyword.put(opts, :priority, params[:priority])
+    else
       opts
-    |> maybe_add_headers("x-delay", to_string(time_in_ms))
     end
-  defp maybe_with_delay(opts, _), do: opts
+  end
+
+  defp maybe_schedule_at(opts, params) do
+    if !is_nil(params[:scheduled_at]) do
+      time_in_ms = DateTime.diff(params[:scheduled_at], DateTime.utc_now())
+      opts
+      |> add_headers(@delay_header, :long, time_in_ms)
+    else
+      opts
+    end
+  end
+
+  defp maybe_schedule_in(opts, params) do
+    if !is_nil(params[:scheduled_in]) do
+      opts
+      |> add_headers(@delay_header, :long, params[:scheduled_in])
+    else
+      opts
+    end
+  end
+
+
+  defp maybe_with_retry_count(opts, params) do
+    if !is_nil(params[:retry_count]) do
+      opts
+      |> add_headers(@retry_header, :long, params[:retry_count])
+    else
+      opts
+    end
+  end
 
   def produce(topic, args, opts \\ []) do
-    IO.puts("Producing message on #{topic}: #{inspect(args)}")
     {:ok, connection} = AMQP.Connection.open()
     {:ok, channel} = AMQP.Channel.open(connection)
+
     publish_options =
       []
       |> maybe_with_priority(opts)
-        |> maybe_with_delay(opts)
+      |> maybe_schedule_at(opts)
+      |> maybe_schedule_in(opts)
+      |> maybe_with_retry_count(opts)
 
-    AMQP.Basic.publish(channel, "", @queue, args, publish_options)
-    AMQP.Connection.close(connection)
+    Logger.debug("Sending to #{topic} with #{inspect(publish_options)}")
+    :ok = AMQP.Basic.publish(channel, @exchange, topic, args, publish_options)
+    :ok = AMQP.Connection.close(connection)
+    {:ok, args}
   end
 end

lib/pleroma/workers/publisher_worker.ex

@@ -15,7 +15,6 @@ def backoff(%Job{attempt: attempt}) when is_integer(attempt) do
   @impl Oban.Worker
   def perform(%Job{args: %{"op" => "publish", "activity_id" => activity_id, "object_data" => nil}}) do
     activity = Activity.get_by_id(activity_id)
-    IO.inspect(activity)
     Federator.perform(:publish, activity)
   end
 

lib/pleroma/workers/purge_expired_activity.ex

@@ -7,7 +7,10 @@ defmodule Pleroma.Workers.PurgeExpiredActivity do
   Worker which purges expired activity.
   """
 
-  use Pleroma.Workers.WorkerHelper, queue: "activity_expiration", max_attempts: 1, unique: [period: :infinity]
+  use Pleroma.Workers.WorkerHelper,
+    queue: "activity_expiration",
+    max_attempts: 1,
+    unique: [period: :infinity]
 
   import Ecto.Query
 

lib/pleroma/workers/purge_expired_filter.ex

@@ -7,7 +7,10 @@ defmodule Pleroma.Workers.PurgeExpiredFilter do
   Worker which purges expired filters
   """
 
-  use Pleroma.Workers.WorkerHelper, queue: "filter_expiration", max_attempts: 1, unique: [period: :infinity]
+  use Pleroma.Workers.WorkerHelper,
+    queue: "filter_expiration",
+    max_attempts: 1,
+    unique: [period: :infinity]
 
   import Ecto.Query
 

lib/pleroma/workers/worker_helper.ex

@@ -71,7 +71,7 @@ def enqueue(op, params, worker_args \\ []) do
               |> Map.put("__module__", worker)
               |> Map.put("op", op)
 
-            Pleroma.Broadway.produce(unquote(queue), Jason.encode!(params))
+            Pleroma.Broadway.produce(unquote(queue), Jason.encode!(params), worker_args)
           end
         end
     end