Federate data through persistent websocket connections

test/web/fed_sockets/fetch_registry_test.exs

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+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.FedSockets.FetchRegistryTest do
+  use ExUnit.Case
+
+  alias Pleroma.Web.FedSockets.FetchRegistry
+  alias Pleroma.Web.FedSockets.FetchRegistry.FetchRegistryData
+
+  @json_message "hello"
+  @json_reply "hello back"
+
+  setup do
+    start_supervised(
+      {Pleroma.Web.FedSockets.Supervisor,
+       [
+         ping_interval: 8,
+         connection_duration: 15,
+         rejection_duration: 5,
+         fed_socket_fetches: [default: 10, interval: 10]
+       ]}
+    )
+
+    :ok
+  end
+
+  test "fetches can be stored" do
+    uuid = FetchRegistry.register_fetch(@json_message)
+
+    assert {:error, :waiting} = FetchRegistry.check_fetch(uuid)
+  end
+
+  test "fetches can return" do
+    uuid = FetchRegistry.register_fetch(@json_message)
+    task = Task.async(fn -> FetchRegistry.register_fetch_received(uuid, @json_reply) end)
+
+    assert {:error, :waiting} = FetchRegistry.check_fetch(uuid)
+    Task.await(task)
+
+    assert {:ok, %FetchRegistryData{received_json: received_json}} =
+             FetchRegistry.check_fetch(uuid)
+
+    assert received_json == @json_reply
+  end
+
+  test "fetches are deleted once popped from stack" do
+    uuid = FetchRegistry.register_fetch(@json_message)
+    task = Task.async(fn -> FetchRegistry.register_fetch_received(uuid, @json_reply) end)
+    Task.await(task)
+
+    assert {:ok, %FetchRegistryData{received_json: received_json}} =
+             FetchRegistry.check_fetch(uuid)
+
+    assert received_json == @json_reply
+    assert {:ok, @json_reply} = FetchRegistry.pop_fetch(uuid)
+
+    assert {:error, :missing} = FetchRegistry.check_fetch(uuid)
+  end
+
+  test "fetches can time out" do
+    uuid = FetchRegistry.register_fetch(@json_message)
+    assert {:error, :waiting} = FetchRegistry.check_fetch(uuid)
+    Process.sleep(500)
+    assert {:error, :missing} = FetchRegistry.check_fetch(uuid)
+  end
+end