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macula
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4.4.3
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4.4.1
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0.48.6
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0.40.0
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0.30.2
0.30.1
0.30.0
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0.28.1
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0.8.25
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0.4.1
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0.3.3
0.3.2
0.3.1
Macula HTTP/3 Mesh SDK — connect, subscribe, publish, call, advertise
Current section
Files
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Files
src/manage_tun_device/macula_tun_reader_proxy.erl
%%%-------------------------------------------------------------------
%%% @doc Owns the inbound TUN-reader mailbox.
%%%
%%% The native TUN reader (see {@link macula_tun:start_reader/2}) sends
%%% `{macula_net_packet, Handle, Payload}' to a registered consumer
%%% process. This module IS that consumer — a long-lived gen_server
%%% that dispatches every received payload to the configured
%%% `dispatch_fn'. Production wires it to
%%% {@link macula_route_packet:dispatch/1}; tests pass a capture fun.
%%%
%%% Replaces an earlier hand-rolled `receive...loop' inside
%%% {@link macula_net} per the workspace rule "every receive loop is a
%%% gen_server candidate". OTP supervision, restart semantics, and
%%% sys/dbg tracing all come for free.
%%% @end
%%%-------------------------------------------------------------------
-module(macula_tun_reader_proxy).
-behaviour(gen_server).
-export([
start_link/1,
stop/1
]).
-export([init/1, handle_call/3, handle_cast/2, handle_info/2,
terminate/2, code_change/3]).
-export_type([config/0]).
-type dispatch_fn() :: fun((Payload :: binary()) -> any()).
-type config() :: #{
dispatch_fn := dispatch_fn()
}.
-record(state, {
dispatch_fn :: dispatch_fn()
}).
%% =============================================================================
%% Public API
%% =============================================================================
-spec start_link(config()) -> {ok, pid()} | {error, term()}.
start_link(#{dispatch_fn := Fun} = Config) when is_function(Fun, 1) ->
gen_server:start_link(?MODULE, Config, []).
-spec stop(pid()) -> ok.
stop(Pid) when is_pid(Pid) ->
gen_server:stop(Pid),
ok.
%% =============================================================================
%% gen_server callbacks
%% =============================================================================
init(#{dispatch_fn := Fun}) ->
process_flag(trap_exit, true),
{ok, #state{dispatch_fn = Fun}}.
handle_call(_Other, _From, State) ->
{reply, {error, unknown_call}, State}.
handle_cast(_Msg, State) ->
{noreply, State}.
%% TUN reader thread delivers packets here. Dispatch + ignore the
%% return value — the dispatcher is responsible for its own logging.
handle_info({macula_net_packet, _Handle, Payload}, State) ->
safe_dispatch(State#state.dispatch_fn, Payload),
{noreply, State};
handle_info(_Other, State) ->
{noreply, State}.
terminate(_Reason, _State) ->
ok.
code_change(_OldVsn, State, _Extra) ->
{ok, State}.
%% =============================================================================
%% Internals
%% =============================================================================
safe_dispatch(Fun, Payload) ->
%% Boundary: the dispatcher is a user-supplied callback. A crash
%% here must not take down the proxy, otherwise a single malformed
%% packet would stop ingest.
try Fun(Payload)
catch _:_ -> ok
end.