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macula
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4.7.1
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3.16.0
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3.11.1
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1.5.2
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1.4.1
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0.48.6
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0.36.6
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0.36.1
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0.34.1
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0.32.5
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0.32.0
0.31.9
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0.31.6
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0.31.2
0.31.1
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0.30.9
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0.30.4
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0.30.2
0.30.1
0.30.0
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0.28.3
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0.28.1
0.28.0
0.27.1
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0.26.1
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0.25.6
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0.20.25
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0.9.2
0.9.1
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0.8.25
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0.7.30
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0.7.27
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0.6.2
0.6.1
0.6.0
0.5.0
0.4.4
0.4.3
0.4.2
0.4.1
0.4.0
0.3.4
0.3.3
0.3.2
0.3.1
Macula HTTP/3 Mesh SDK — connect, subscribe, publish, call, advertise
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Files
src/macula_publisher.erl
%%%-------------------------------------------------------------------
%%% @doc Behaviour for supervised content publishers.
%%%
%%% `macula:publish/4' is a plain blocking call — no addressable pid to
%%% cancel it from outside. This is the missing supervised counterpart
%%% to `macula_subscriber': every other primitive pair already has one
%%% on each side (`macula_request'/`macula_response' for RPC,
%%% `macula_streamer'/`macula_stream_sink' for streaming RPC,
%%% `macula_feeder'/`macula_download' for content sharing) — pubsub had
%%% only the consumer half. `start_link/5,6' returns immediately with a
%%% pid, runs `macula:publish/4' in a linked worker, delivers the
%%% outcome to `Module:handle_published/2', and publishes
%%% `pubsub.publish_started_v1' / `pubsub.publish_completed_v1' mesh
%%% facts around the publish — including `outcome => cancelled' if the
%%% publisher is stopped before the publish resolves.
%%%
%%% == Example ==
%%%
%%% ```
%%% -module(status_publisher).
%%% -behaviour(macula_publisher).
%%% -export([init/1, handle_published/2]).
%%%
%%% init(Parent) -> {ok, Parent}.
%%%
%%% handle_published(Result, Parent) ->
%%% Parent ! {published, Result},
%%% {stop, normal, Parent}.
%%% '''
%%%
%%% ```
%%% {ok, Pid} = macula_publisher:start_link(status_publisher, Pool, Realm,
%%% Topic, Payload, self()).
%%% '''
%%% @end
%%%-------------------------------------------------------------------
-module(macula_publisher).
-behaviour(gen_server).
-export([start_link/5, start_link/6]).
-export([cancel/1]).
-export([init/1, handle_call/3, handle_cast/2, handle_info/2, terminate/2]).
-callback init(Args :: term()) ->
{ok, State :: term()} | {stop, Reason :: term()}.
-callback handle_published(Result :: ok | {error, term()}, State :: term()) ->
{noreply, NewState :: term()} | {stop, Reason :: term(), NewState :: term()}.
-define(PUBLISH_STARTED, <<"pubsub.publish_started_v1">>).
-define(PUBLISH_COMPLETED, <<"pubsub.publish_completed_v1">>).
-record(pstate, {
module :: module(),
pool :: macula:pool(),
realm :: macula:realm(),
announce :: boolean(),
publish_id :: binary(),
worker :: pid(),
completed :: boolean(),
user :: term()
}).
%% @doc Start a publisher. Publishes `Payload' on `Topic' via `Pool'.
-spec start_link(module(), macula:pool(), macula:realm(), macula:topic(),
term()) -> {ok, pid()} | {error, term()}.
start_link(Module, Pool, Realm, Topic, Payload) ->
start_link(Module, Pool, Realm, Topic, Payload, undefined).
%% @doc As `start_link/5', with `Args' passed to `Module:init/1'.
-spec start_link(module(), macula:pool(), macula:realm(), macula:topic(),
term(), term()) -> {ok, pid()} | {error, term()}.
start_link(Module, Pool, Realm, Topic, Payload, Args) ->
gen_server:start_link(?MODULE,
{Module, Pool, Realm, Topic, Payload, true, Args}, []).
%% @doc Cancel an in-flight publish. Publishes
%% `pubsub.publish_completed_v1' with `outcome => cancelled' if the
%% publish had not resolved yet.
-spec cancel(pid()) -> ok.
cancel(Pid) -> gen_server:stop(Pid).
%%%===================================================================
%%% gen_server callbacks
%%%===================================================================
%% @private
init({Module, Pool, Realm, Topic, Payload, Announce, InitArgs}) ->
process_flag(trap_exit, true),
case Module:init(InitArgs) of
{ok, UserState} ->
PublishId = crypto:strong_rand_bytes(16),
publish(Announce, Pool, Realm, ?PUBLISH_STARTED,
#{publish_id => PublishId, topic => Topic}),
Worker = spawn_worker(Pool, Realm, Topic, Payload),
{ok, #pstate{module = Module, pool = Pool, realm = Realm,
announce = Announce, publish_id = PublishId,
worker = Worker, completed = false, user = UserState}};
{stop, Reason} ->
{stop, Reason}
end.
spawn_worker(Pool, Realm, Topic, Payload) ->
Parent = self(),
spawn_link(fun() ->
Result = macula:publish(Pool, Realm, Topic, Payload),
Parent ! {publish_result, Result}
end).
%% @private
handle_call(_Request, _From, State) ->
{reply, {error, unsupported}, State}.
%% @private
handle_cast(_Msg, State) -> {noreply, State}.
%% @private
handle_info({publish_result, Result}, State) ->
NewState = announce_completed(State, Result),
#pstate{module = Module, user = User} = NewState,
deliver(Module:handle_published(Result, User), NewState);
handle_info({'EXIT', Worker, Reason}, #pstate{worker = Worker} = State)
when Reason =/= normal ->
{stop, {worker_crashed, Reason}, State};
handle_info(_Msg, State) ->
{noreply, State}.
deliver({noreply, NewUser}, State) -> {noreply, State#pstate{user = NewUser}};
deliver({stop, Reason, NewUser}, State) -> {stop, Reason, State#pstate{user = NewUser}}.
%% @private
terminate(_Reason, #pstate{worker = Worker, completed = true}) ->
unlink(Worker),
exit(Worker, kill),
ok;
terminate(_Reason, State) ->
unlink(State#pstate.worker),
exit(State#pstate.worker, kill),
_ = announce_completed(State, {error, cancelled}),
ok.
announce_completed(#pstate{completed = true} = State, _Result) ->
State;
announce_completed(#pstate{pool = Pool, realm = Realm, announce = Announce,
publish_id = PublishId} = State, Result) ->
publish(Announce, Pool, Realm, ?PUBLISH_COMPLETED,
outcome_fields(#{publish_id => PublishId}, Result)),
State#pstate{completed = true}.
outcome_fields(Base, ok) ->
Base#{outcome => completed};
outcome_fields(Base, {error, cancelled}) ->
Base#{outcome => cancelled};
outcome_fields(Base, {error, Reason}) ->
Base#{outcome => failed, reason => Reason}.
publish(false, _, _, _, _) -> ok;
publish(true, Pool, Realm, Topic, Payload) ->
_ = macula:publish(Pool, Realm, Topic, Payload), ok.