Implementing mod_blocking on MongooseIM - erlang

Question

I'm trying to implement mod_blocking that will work only with mod_privacy in odbc module.
I keep getting the response:
<error code='500' type='wait'><internal-server-error0 xmlns='urn:ietf:params:xml:ns:xmpp-stanzas'/></error>
Here is my code:
process_blocklist_block(LUser, LServer, JIDs) ->
Filter = fun (List) ->
AlreadyBlocked = list_to_blocklist_jids(List, []),
lists:foldr(fun (JID, List1) ->
case lists:member(JID, AlreadyBlocked)
of
true -> List1;
false ->
[#listitem{type = jid,
value = JID,
action = deny,
order = 0,
match_all = true}
| List1]
end
end,
List, JIDs)
end,
case process_blocklist_block(LUser, LServer, Filter,odbc)
of
{atomic, {ok, Default, List}} ->
UserList = make_userlist(Default, List),
broadcast_list_update(LUser, LServer, Default,
UserList),
broadcast_blocklist_event(LUser, LServer,
{block, JIDs}),
{result, [], UserList};
_ -> {error, ?ERR_INTERNAL_SERVER_ERROR}
end.
process_blocklist_block(LUser, LServer, Filter, odbc) ->
F = fun () ->
Default = case mod_privacy_odbc:sql_get_default_privacy_list_t(LUser)
of
{selected, [<<"name">>], []} ->
Name = <<"Blocked contacts">>,
mod_privacy_odbc:sql_add_privacy_list(LUser, Name),
mod_privacy_odbc:sql_set_default_privacy_list(LUser, Name),
Name;
{selected, [<<"name">>], [[Name]]} -> Name
end,
{selected, [<<"id">>], [[ID]]} = mod_privacy_odbc:sql_get_privacy_list_id_t(LUser, Default),
case mod_privacy_odbc:sql_get_privacy_list_data_by_id_t(ID)
of
{selected,
[<<"t">>, <<"value">>, <<"action">>, <<"ord">>,
<<"match_all">>, <<"match_iq">>, <<"match_message">>,
<<"match_presence_in">>, <<"match_presence_out">>],
RItems = [_ | _]} ->
List = lists:map(fun mod_privacy_odbc:raw_to_item/1, RItems);
_ -> List = []
end,
NewList = Filter(List),
NewRItems = lists:map(fun mod_privacy_odbc:item_to_raw/1, NewList),
mod_privacy_odbc:sql_set_privacy_list(ID, NewRItems),
{ok, Default, NewList}
end,
ejabberd_odbc:sql_transaction(LServer, F).
I've checked all the queries. They work fine. I struggling with understanding the logic of this piece of code. What is the best way to debug this code, so i can understand when my logic is failing? Could anyone point me in the right direction?
UserList = make_userlist(Default, List),
broadcast_list_update(LUser, LServer, Default,
UserList),
broadcast_blocklist_event(LUser, LServer,
{block, JIDs}),
{result, [], UserList};
_ -> {error, ?ERR_INTERNAL_SERVER_ERROR}

Answer 1

if you expect
_ -> {error, ?ERR_INTERNAL_SERVER_ERROR}
is the point where server returns 'internal server error', you can just change this place to
_Otherwise ->
?WARNING_MSG("Got some unexpected result in mod_priv ~100000p",[_Otherwise]),
{error, ?ERR_INTERNAL_SERVER_ERROR)
and then look at log/ejabberd.log
Of course you need to start mongooseim with loglevel at least 3 in the ejabberd.cfg