Files
fluxer/fluxer_gateway/src/session/session_dispatch.erl
Hampus Kraft 2f557eda8c initial commit
2026-01-01 21:05:54 +00:00

487 lines
17 KiB
Erlang

%% Copyright (C) 2026 Fluxer Contributors
%%
%% This file is part of Fluxer.
%%
%% Fluxer is free software: you can redistribute it and/or modify
%% it under the terms of the GNU Affero General Public License as published by
%% the Free Software Foundation, either version 3 of the License, or
%% (at your option) any later version.
%%
%% Fluxer is distributed in the hope that it will be useful,
%% but WITHOUT ANY WARRANTY; without even the implied warranty of
%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
%% GNU Affero General Public License for more details.
%%
%% You should have received a copy of the GNU Affero General Public License
%% along with Fluxer. If not, see <https://www.gnu.org/licenses/>.
-module(session_dispatch).
-export([
handle_dispatch/3,
flush_all_pending_presences/1
]).
handle_dispatch(Event, Data, State) ->
case should_ignore_event(Event, State) of
true ->
{noreply, State};
false ->
case should_buffer_presence(Event, Data, State) of
true ->
{noreply, buffer_presence(Event, Data, State)};
false ->
Seq = maps:get(seq, State),
Buffer = maps:get(buffer, State),
SocketPid = maps:get(socket_pid, State, undefined),
NewSeq = Seq + 1,
Request = #{event => Event, data => Data, seq => NewSeq},
NewBuffer =
case Event of
message_reaction_add ->
Buffer;
message_reaction_remove ->
Buffer;
_ ->
Buffer ++ [Request]
end,
case SocketPid of
undefined ->
ok;
Pid when is_pid(Pid) ->
case erlang:is_process_alive(Pid) of
true ->
Pid ! {dispatch, Event, Data, NewSeq},
ok;
false ->
ok
end
end,
StateWithChannels = update_channels_map(Event, Data, State),
StateWithRelationships0 = update_relationships_map(
Event, Data, StateWithChannels
),
StateAfterMain = maps:merge(StateWithRelationships0, #{
seq => NewSeq, buffer => NewBuffer
}),
StateWithPending = maybe_flush_pending_presences(Event, Data, StateAfterMain),
FinalState = sync_presence_targets(StateWithPending),
{noreply, FinalState}
end
end.
should_buffer_presence(presence_update, Data, State) ->
case maps:get(suppress_presence_updates, State, true) of
true ->
true;
false ->
HasGuildId =
is_map(Data) andalso (maps:get(<<"guild_id">>, Data, undefined) =/= undefined),
case HasGuildId of
true ->
false;
false ->
UserId = presence_user_id(Data),
Relationships = maps:get(relationships, State, #{}),
case UserId of
undefined ->
false;
_ ->
IsRelationship = relationship_allows_presence(UserId, Relationships),
IsGroupDmRecipient = is_group_dm_recipient(UserId, State),
not (IsRelationship orelse IsGroupDmRecipient)
end
end
end;
should_buffer_presence(_, _, _) ->
false.
relationship_allows_presence(UserId, Relationships) when
is_integer(UserId), is_map(Relationships)
->
case maps:get(UserId, Relationships, 0) of
1 -> true;
3 -> true;
_ -> false
end;
relationship_allows_presence(_, _) ->
false.
is_group_dm_recipient(UserId, State) ->
GroupDmRecipients = presence_targets:group_dm_recipients_from_state(State),
lists:any(
fun({_ChannelId, Recipients}) ->
maps:is_key(UserId, Recipients)
end,
maps:to_list(GroupDmRecipients)
).
buffer_presence(Event, Data, State) ->
Pending = maps:get(pending_presences, State, []),
UserId = presence_user_id(Data),
maps:put(
pending_presences, Pending ++ [#{event => Event, data => Data, user_id => UserId}], State
).
maybe_flush_pending_presences(relationship_add, Data, State) ->
maybe_flush_relationship_pending_presences(Data, State);
maybe_flush_pending_presences(relationship_update, Data, State) ->
maybe_flush_relationship_pending_presences(Data, State);
maybe_flush_pending_presences(_, _, State) ->
State.
maybe_flush_relationship_pending_presences(Data, State) when is_map(Data) ->
case maps:get(<<"type">>, Data, 0) of
1 ->
flush_pending_presences(relationship_target_id(Data), State);
3 ->
flush_pending_presences(relationship_target_id(Data), State);
_ ->
State
end;
maybe_flush_relationship_pending_presences(_Data, State) ->
State.
flush_pending_presences(undefined, State) ->
State;
flush_pending_presences(UserId, State) ->
Pending = maps:get(pending_presences, State, []),
{ToSend, Remaining} =
lists:partition(fun(P) -> maps:get(user_id, P, undefined) =:= UserId end, Pending),
FlushedState =
lists:foldl(
fun(P, AccState) ->
dispatch_presence_now(P, AccState)
end,
State,
ToSend
),
maps:put(pending_presences, Remaining, FlushedState).
dispatch_presence_now(P, State) ->
Event = maps:get(event, P),
Data = maps:get(data, P),
Seq = maps:get(seq, State),
Buffer = maps:get(buffer, State),
SocketPid = maps:get(socket_pid, State, undefined),
NewSeq = Seq + 1,
Request = #{event => Event, data => Data, seq => NewSeq},
NewBuffer = Buffer ++ [Request],
case SocketPid of
undefined ->
ok;
Pid when is_pid(Pid) ->
case erlang:is_process_alive(Pid) of
true ->
Pid ! {dispatch, Event, Data, NewSeq},
ok;
false ->
ok
end
end,
maps:merge(State, #{seq => NewSeq, buffer => NewBuffer}).
presence_user_id(Data) when is_map(Data) ->
User = maps:get(<<"user">>, Data, #{}),
map_utils:get_integer(User, <<"id">>, undefined);
presence_user_id(_) ->
undefined.
relationship_target_id(Data) when is_map(Data) ->
type_conv:extract_id(Data, <<"id">>).
flush_all_pending_presences(State) ->
Pending = maps:get(pending_presences, State, []),
FlushedState =
lists:foldl(
fun(P, AccState) ->
dispatch_presence_now(P, AccState)
end,
State,
Pending
),
maps:put(pending_presences, [], FlushedState).
should_ignore_event(Event, State) ->
IgnoredEvents = maps:get(ignored_events, State, #{}),
case event_name(Event) of
undefined ->
false;
EventName ->
maps:is_key(EventName, IgnoredEvents)
end.
event_name(Event) when is_binary(Event) ->
Event;
event_name(Event) when is_atom(Event) ->
try constants:dispatch_event_atom(Event) of
Name when is_binary(Name) ->
Name
catch
_:_ ->
undefined
end;
event_name(_) ->
undefined.
update_channels_map(channel_create, Data, State) when is_map(Data) ->
case maps:get(<<"type">>, Data, undefined) of
1 ->
add_channel_to_state(Data, State);
3 ->
add_channel_to_state(Data, State);
_ ->
State
end;
update_channels_map(channel_update, Data, State) when is_map(Data) ->
case maps:get(<<"type">>, Data, undefined) of
1 ->
add_channel_to_state(Data, State);
3 ->
add_channel_to_state(Data, State);
_ ->
State
end;
update_channels_map(channel_delete, Data, State) when is_map(Data) ->
case maps:get(<<"id">>, Data, undefined) of
undefined ->
State;
ChannelIdBin ->
case validation:validate_snowflake(<<"id">>, ChannelIdBin) of
{ok, ChannelId} ->
Channels = maps:get(channels, State, #{}),
NewChannels = maps:remove(ChannelId, Channels),
maps:put(channels, NewChannels, State);
{error, _, _} ->
State
end
end;
update_channels_map(channel_recipient_add, Data, State) when is_map(Data) ->
update_recipient_membership(add, Data, State);
update_channels_map(channel_recipient_remove, Data, State) when is_map(Data) ->
update_recipient_membership(remove, Data, State);
update_channels_map(_Event, _Data, State) ->
State.
add_channel_to_state(Data, State) ->
case maps:get(<<"id">>, Data, undefined) of
undefined ->
State;
ChannelIdBin ->
case validation:validate_snowflake(<<"id">>, ChannelIdBin) of
{ok, ChannelId} ->
Channels = maps:get(channels, State, #{}),
NewChannels = maps:put(ChannelId, Data, Channels),
UserId = maps:get(user_id, State),
logger:info(
"[session_dispatch] Added/updated channel ~p for user ~p, type: ~p",
[ChannelId, UserId, maps:get(<<"type">>, Data, 0)]
),
maps:put(channels, NewChannels, State);
{error, _, _} ->
State
end
end.
update_recipient_membership(Action, Data, State) ->
ChannelIdBin = maps:get(<<"channel_id">>, Data, undefined),
case validation:validate_snowflake(<<"channel_id">>, ChannelIdBin) of
{ok, ChannelId} ->
Channels = maps:get(channels, State, #{}),
case maps:get(ChannelId, Channels, undefined) of
undefined ->
State;
Channel ->
case maps:get(<<"type">>, Channel, 0) of
3 ->
UserMap = maps:get(<<"user">>, Data, #{}),
RecipientId = type_conv:extract_id(UserMap, <<"id">>),
case RecipientId of
undefined ->
State;
_ ->
UpdatedChannel = update_channel_recipient(
Channel, RecipientId, UserMap, Action
),
NewChannels = maps:put(ChannelId, UpdatedChannel, Channels),
maps:put(channels, NewChannels, State)
end;
_ ->
State
end
end;
_ ->
State
end.
update_channel_recipient(Channel, RecipientId, UserMap, add) ->
RecipientIds = maps:get(<<"recipient_ids">>, Channel, []),
Recipients = maps:get(<<"recipients">>, Channel, []),
NewRecipientIds = add_unique_id(RecipientId, RecipientIds),
NewRecipients = add_unique_user(UserMap, Recipients),
Channel#{<<"recipient_ids">> => NewRecipientIds, <<"recipients">> => NewRecipients};
update_channel_recipient(Channel, RecipientId, _UserMap, remove) ->
RecipientIds = maps:get(<<"recipient_ids">>, Channel, []),
Recipients = maps:get(<<"recipients">>, Channel, []),
NewRecipientIds = lists:filter(
fun(Id) -> Id =/= integer_to_binary(RecipientId) andalso Id =/= RecipientId end,
RecipientIds
),
NewRecipients = lists:filter(
fun(R) ->
case type_conv:extract_id(R, <<"id">>) of
RecipientId -> false;
_ -> true
end
end,
Recipients
),
Channel#{<<"recipient_ids">> => NewRecipientIds, <<"recipients">> => NewRecipients}.
add_unique_id(Id, List) ->
case lists:member(Id, List) orelse lists:member(integer_to_binary(Id), List) of
true -> List;
false -> [Id | List]
end.
add_unique_user(UserMap, List) when is_map(UserMap) ->
case type_conv:extract_id(UserMap, <<"id">>) of
undefined ->
List;
Id ->
case
lists:any(
fun(R) -> type_conv:extract_id(R, <<"id">>) =:= Id end,
List
)
of
true -> List;
false -> [UserMap | List]
end
end.
update_relationships_map(relationship_add, Data, State) ->
upsert_relationship(Data, State);
update_relationships_map(relationship_update, Data, State) ->
upsert_relationship(Data, State);
update_relationships_map(relationship_remove, Data, State) ->
case type_conv:extract_id(Data, <<"id">>) of
undefined ->
State;
UserId ->
Relationships = maps:get(relationships, State, #{}),
NewRelationships = maps:remove(UserId, Relationships),
maps:put(relationships, NewRelationships, State)
end;
update_relationships_map(_, _, State) ->
State.
upsert_relationship(Data, State) ->
case type_conv:extract_id(Data, <<"id">>) of
undefined ->
State;
UserId ->
Type = maps:get(<<"type">>, Data, 0),
Relationships = maps:get(relationships, State, #{}),
NewRelationships = maps:put(UserId, Type, Relationships),
maps:put(relationships, NewRelationships, State)
end.
sync_presence_targets(State) ->
PresencePid = maps:get(presence_pid, State, undefined),
case PresencePid of
undefined ->
State;
Pid when is_pid(Pid) ->
FriendIds = presence_targets:friend_ids_from_state(State),
GroupRecipients = presence_targets:group_dm_recipients_from_state(State),
gen_server:cast(Pid, {sync_friends, FriendIds}),
gen_server:cast(Pid, {sync_group_dm_recipients, GroupRecipients}),
State
end.
-ifdef(TEST).
-include_lib("eunit/include/eunit.hrl").
base_state_for_presence_buffer_test(Opts) ->
maps:merge(
#{
seq => 0,
user_id => 1,
buffer => [],
socket_pid => undefined,
channels => #{},
relationships => #{},
suppress_presence_updates => false,
pending_presences => [],
presence_pid => undefined,
ignored_events => #{}
},
Opts
).
presence_update_with_guild_id_not_buffered_test() ->
State0 = base_state_for_presence_buffer_test(#{}),
Presence = #{
<<"guild_id">> => <<"123">>,
<<"user">> => #{<<"id">> => <<"2">>},
<<"status">> => <<"idle">>
},
{noreply, State1} = handle_dispatch(presence_update, Presence, State0),
?assertEqual([], maps:get(pending_presences, State1, [])),
?assertEqual(1, length(maps:get(buffer, State1, []))),
ok.
presence_update_without_guild_id_buffered_for_non_relationship_test() ->
State0 = base_state_for_presence_buffer_test(#{}),
Presence = #{
<<"user">> => #{<<"id">> => <<"2">>},
<<"status">> => <<"online">>
},
{noreply, State1} = handle_dispatch(presence_update, Presence, State0),
?assertEqual(1, length(maps:get(pending_presences, State1, []))),
?assertEqual([], maps:get(buffer, State1, [])),
ok.
presence_update_without_guild_id_not_buffered_for_relationship_test() ->
State0 = base_state_for_presence_buffer_test(#{relationships => #{2 => 1}}),
Presence = #{
<<"user">> => #{<<"id">> => <<"2">>},
<<"status">> => <<"online">>
},
{noreply, State1} = handle_dispatch(presence_update, Presence, State0),
?assertEqual([], maps:get(pending_presences, State1, [])),
?assertEqual(1, length(maps:get(buffer, State1, []))),
ok.
presence_update_without_guild_id_buffered_for_outgoing_request_relationship_test() ->
State0 = base_state_for_presence_buffer_test(#{relationships => #{2 => 4}}),
Presence = #{
<<"user">> => #{<<"id">> => <<"2">>},
<<"status">> => <<"online">>
},
{noreply, State1} = handle_dispatch(presence_update, Presence, State0),
?assertEqual(1, length(maps:get(pending_presences, State1, []))),
?assertEqual([], maps:get(buffer, State1, [])),
ok.
presence_update_without_guild_id_not_buffered_for_incoming_request_relationship_test() ->
State0 = base_state_for_presence_buffer_test(#{relationships => #{2 => 3}}),
Presence = #{
<<"user">> => #{<<"id">> => <<"2">>},
<<"status">> => <<"online">>
},
{noreply, State1} = handle_dispatch(presence_update, Presence, State0),
?assertEqual([], maps:get(pending_presences, State1, [])),
?assertEqual(1, length(maps:get(buffer, State1, []))),
ok.
-endif.