问题描述
我正在创建一个自定义模块，它使用从 mod_shared_roster 模块导出的一些函数。这是代码。
-module(mod_shared_roster_extra).
-author('https://github.com/eric-mendoza').
-behavIoUr(gen_mod).
-include("logger.hrl").
-include("translate.hrl").
-export([start/2,stop/1,reload/3,mod_options/1,get_commands_spec/0,depends/2,mod_doc/0]).
% Commands API
-export([
% Shared roster
srg_display_group_add/4,srg_display_group_del/4,srg_set_opts/4
]).
-include("ejabberd_commands.hrl").
-include("mod_roster.hrl").
-include("mod_privacy.hrl").
-include("ejabberd_sm.hrl").
-include_lib("xmpp/include/xmpp.hrl").
-include("mod_shared_roster.hrl").
%%%
%%% gen_mod
%%%
start(_Host,_Opts) ->
ejabberd_commands:register_commands(get_commands_spec()).
stop(Host) ->
case gen_mod:is_loaded_elsewhere(Host,?MODULE) of
false ->
ejabberd_commands:unregister_commands(get_commands_spec());
true ->
ok
end.
reload(_Host,_NewOpts,_OldOpts) ->
ok.
depends(_Host,_Opts) ->
[{mod_shared_roster,hard}].
%%%
%%% Register commands
%%%
get_commands_spec() ->
[
#ejabberd_commands{name = srg_display_group_add,tags = [shared_roster_group],desc = "Add group id to the Shared Roster Group display list",module = ?MODULE,function = srg_display_group_add,args = [{displaygroup,binary},{displaygrouphost,{group,{grouphost,binary}],args_example = [<<"group1">>,<<"myserver.com">>,<<"group3">>,<<"myserver.com">>],args_desc = ["Group to be added in display list","Group server name","Group to modify display list identifier","Group server name"],result = {res,rescode}},#ejabberd_commands{name = srg_display_group_del,desc = "Delete group id from the Shared Roster Group",function = srg_display_group_del,args_desc = ["Group to be removed from display list",#ejabberd_commands{name = srg_set_opts,desc = "Update Shared Roster Group options (name and description)",function = srg_set_opts,args = [{name,{description,args_example = [<<"Group Test Name">>,<<"Group used for testing.">>,args_desc = ["Shared roster group name","Shared Roster Group description","Group identifier",rescode}}
].
%%%
%%% Shared Roster Groups
%%%
to_list([]) -> [];
to_list([H|T]) -> [to_list(H)|to_list(T)];
to_list(E) when is_atom(E) -> atom_to_list(E);
to_list(E) -> binary_to_list(E).
srg_display_group_add(NewGroup,NewGroupHost,Group,GroupHost) ->
?DEBUG("Adding group to display list.",[]),Opts = mod_shared_roster:get_group_opts(Group,GroupHost),mod_shared_roster:set_group_opts(GroupHost,Opts),ok.
srg_display_group_del(DeleteGroup,DeleteGroupHost,GroupHost) ->
?DEBUG("Removing group from display list.",%% mod_shared_roster:set_group_opts(GroupHost,ok.
srg_set_opts(Label1,Description1,GroupHost) ->
?DEBUG("Setting group options -> Label: ~p,Description: ~p~n",[Label1,Description1]),Label = if Label1 == <<"">> -> [];
true -> [{label,Label1}]
end,Description = if Description1 == <<"">> -> [];
true -> [{description,Description1}]
end,displayed1 = get_opt(Opts,displayed_groups,displayed = if displayed1 == [] -> [];
true -> [{displayed_groups,displayed1}]
end,?DEBUG("Options: ~p~n",[Label ++ Description ++ displayed]),Label ++ Description ++ displayed),ok.
mod_options(_) -> [].
get_opt(Opts,Opt,Default) ->
case lists:keysearch(Opt,1,Opts) of
{value,{_,Val}} -> Val;
false -> Default
end.
mod_doc() ->
#{desc =>
?T("This module provides additional administrative commands for shared rosters.")}.
模块安装正确，但是当我调用使用 srg_set_opts 的方法 mod_shared_roster:get_group_opts 时，我收到以下错误：
error: {module_not_loaded,mod_shared_roster,<<"srg_group10">>}
我看过其他模块作为指南，我注意到的唯一区别是这些模块依赖项包含在同一目录中。但是，我怎么能用自定义模块来实现呢？我对 Erlang 没有经验，所以它可能只是一个简单的导入。
我正在使用通过 docker-ejabberd 安装的 ejabberd 20.04，并使用 Ejabberd module docs for Docker 安装模块。
解决方法
Opts = mod_shared_roster:get_group_opts(Group,GroupHost),我认为该函数的参数是 Host 和 Group，但您以相反的顺序提供它们。