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Manage your Nerves fleet by connecting it to NervesHub
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lib/nerves_hub_link/alarms.ex
# SPDX-FileCopyrightText: 2025 Josh Kalderimis
#
# SPDX-License-Identifier: Apache-2.0
#
defmodule NervesHubLink.Alarms do
@moduledoc """
A slim adapter for `Alarmist` and `:alarm_handler`, providing a unified interface for setting and clearing alarms.
This primarily exists because `:alarm_handler.get_alarms()` will fail if the default alarm_handler
has been replaced. Until a path is decided for account for that, this keeps the implementations
separate with minimal set/clear handling adjustment when the default handler is used in order to
match Alarmist experience better.
"""
if Code.ensure_loaded?(Alarmist) do
@spec get_alarms() :: [Alarmist.alarm()]
def get_alarms(), do: Alarmist.get_alarms()
@spec clear_alarm(term()) :: :ok
def clear_alarm(alarm), do: :alarm_handler.clear_alarm(alarm)
@spec set_alarm({term(), term()}) :: :ok
def set_alarm(alarm), do: :alarm_handler.set_alarm(alarm)
else
@spec get_alarms() :: [{term(), term()}]
def get_alarms(), do: :alarm_handler.get_alarms()
@spec clear_alarm(term()) :: :ok
def clear_alarm(alarm) do
get_alarms()
|> Enum.filter(&(elem(&1, 0) == alarm))
|> Enum.each(fn _ -> :alarm_handler.clear_alarm(alarm) end)
:ok
end
@spec set_alarm({term(), term()}) :: :ok
def set_alarm({mod, _} = alarm) do
if Enum.any?(:alarm_handler.get_alarms(), &(elem(&1, 0) == mod)) do
:ok
else
:alarm_handler.set_alarm(alarm)
end
end
end
end