Host deregistration events (#1245)

* Host deregistration commands

* Host deregistration events

* Fixing module attributes in host deregistration commands

lib/trento/domain/host/commands/deregister_host.ex

@@ -0,0 +1,12 @@
+defmodule Trento.Domain.Host.Commands.DeregisterHost do
+  @moduledoc """
+    Deregister a host
+  """
+  @required_fields :all
+
+  use Trento.Command
+
+  defcommand do
+    field :host_id, Ecto.UUID
+  end
+end

lib/trento/domain/host/commands/request_host_deregistration.ex

@@ -0,0 +1,12 @@
+defmodule Trento.Domain.Host.Commands.RequestHostDeregistration do
+  @moduledoc """
+    Request a deregistration of a host
+  """
+  @required_fields :all
+
+  use Trento.Command
+
+  defcommand do
+    field :host_id, Ecto.UUID
+  end
+end

lib/trento/domain/host/events/host_deregistered.ex

@@ -0,0 +1,12 @@
+defmodule Trento.Domain.Host.Events.HostDeregistered do
+  @moduledoc """
+    This event is emitted when a deregistration (decomission) of a host is completed.
+  """
+
+  use Trento.Event
+
+  defevent do
+    field :host_id, Ecto.UUID
+    field :deregistered_at, :utc_datetime_usec
+  end
+end

lib/trento/domain/host/events/host_deregistration_requested.ex

@@ -0,0 +1,11 @@
+defmodule Trento.Domain.Host.Events.HostDeregistrationRequested do
+  @moduledoc """
+    This event is emitted when a deregistration (decomission) of a host is requested.
+  """
+
+  use Trento.Event
+
+  defevent do
+    field :host_id, Ecto.UUID
+  end
+end