neiam /lambent_ex

Lambent Aether 5

meta changes

e27d884 · Gabriel Morell · 2026-08-17 21:48

5 files +29 -3

modified config/runtime.exs

+8 −0

@@ -16,6 +16,14 @@ import Config

16	16	#
17	17	# Alternatively, you can use `mix phx.gen.release` to generate a `bin/server`
18	18	# script that automatically sets the env var above.
	19	+# where the dets metadata table is kept — device names/places/order, and the
	20	+# persisted machines and links. in the container this wants to be the mounted
	21	+# volume, everything else keeps it next to the project.
	22	+config :lambent_ex,
	23	+ :meta_dir,
	24	+ System.get_env("LEX_META_DIR") \|\|
	25	+ if(config_env() == :prod, do: "/opt/app/meta", else: ".")
	26	+
19	27	if System.get_env("PHX_SERVER") do
20	28	config :lambent_ex, LambentExWeb.Endpoint,
21	29	server: true,

modified lib/lambent_ex/meta.ex

+21 −3

@@ -6,9 +6,15 @@ defmodule LambentEx.Meta do

6	6	@pubsub_svc "svc_pub"
7	7
8	8	def init(arg) do
9		− # File.cd("meta")
10		− {:ok, table} = :dets.open_file(@table, type: :set)
11		− # File.cd("..")
	9	+ {:ok, table} =
	10	+ :dets.open_file(@table,
	11	+ type: :set,
	12	+ file: dets_file(),
	13	+ # default is three minutes, which is a lot to lose to a hard restart.
	14	+ # the flush loops below dirty the table every 5s, so this is what
	15	+ # actually sets how often the file is written.
	16	+ auto_save: :timer.seconds(30)
	17	+ )
12	18
13	19	Phoenix.PubSub.subscribe(@pubsub_name, "machines_idx")
14	20	Phoenix.PubSub.subscribe(@pubsub_name, "links_idx")

@@ -26,6 +32,18 @@ defmodule LambentEx.Meta do

26	32	GenServer.start_link(__MODULE__, arg, name: __MODULE__)
27	33	end
28	34
	35	+ @doc """
	36	+ Where the dets table lives. Left to itself dets names the file after the
	37	+ table and drops it in the cwd, which in a container is a layer that does not
	38	+ survive the next start, so point it at whatever is mounted instead.
	39	+ """
	40	+ def dets_file do
	41	+ dir = Application.get_env(:lambent_ex, :meta_dir) \|\| System.get_env("LEX_META_DIR") \|\| "."
	42	+ File.mkdir_p!(dir)
	43	+
	44	+ dir \|> Path.join(Kernel.to_string(@table)) \|> String.to_charlist()
	45	+ end
	46	+
29	47	# devices
30	48	def get_name(mac) do
31	49	case :dets.lookup(@table, "name-#{mac}") do

Parents: 44aeeea