| 1 |
|
%% Returns a numeric id from 0 to 255 for the current node. |
| 2 |
|
%% Used to generate MAM IDs. |
| 3 |
|
-module(mongoose_node_num). |
| 4 |
|
-export([node_num/0, set_node_num/1]). |
| 5 |
|
|
| 6 |
|
-type node_num() :: 0..255. |
| 7 |
|
-export_type([node_num/0]). |
| 8 |
|
|
| 9 |
|
%% @doc Return an integer node ID. |
| 10 |
|
-spec node_num() -> node_num(). |
| 11 |
|
node_num() -> |
| 12 |
|
%% We just return 0 if set_node_num/1 is not called. |
| 13 |
2988 |
persistent_term:get(?MODULE, 0). |
| 14 |
|
|
| 15 |
|
-spec set_node_num(node_num()) -> ignore | updated | same. |
| 16 |
|
set_node_num(Num) -> |
| 17 |
77 |
case node_num() =:= Num of |
| 18 |
|
true -> |
| 19 |
51 |
same; |
| 20 |
|
false -> |
| 21 |
26 |
persistent_term:put(?MODULE, Num), |
| 22 |
26 |
updated |
| 23 |
|
end. |