Packages
macula
9.3.1
9.13.8
9.8.2
9.8.1
9.8.0
9.5.0
9.4.0
9.3.1
9.3.0
9.2.0
9.1.1
9.1.0
9.0.0
8.7.0
8.6.0
8.5.0
8.4.1
8.4.0
8.3.0
8.2.0
8.1.0
8.0.2
8.0.1
8.0.0
7.1.0
7.0.0
6.0.0
5.2.2
5.2.1
5.2.0
5.1.0
5.0.0
4.8.0
4.7.1
4.7.0
4.6.0
4.5.0
4.4.10
4.4.9
4.4.8
4.4.7
4.4.6
4.4.5
4.4.4
4.4.3
4.4.2
4.4.1
4.4.0
4.3.1
4.3.0
4.2.9
4.2.8
4.2.7
4.2.6
4.2.5
4.2.4
4.2.3
4.2.2
4.2.1
4.2.0
4.1.1
4.1.0
4.0.0
3.16.0
3.15.3
3.15.2
3.15.1
3.14.0
3.13.0
3.12.1
3.12.0
3.11.1
3.11.0
3.10.3
3.10.2
3.10.1
3.9.0
3.8.0
3.7.0
3.5.0
3.4.0
3.3.0
3.2.0
3.1.0
3.0.0
2.1.1
2.1.0
2.0.0
1.5.2
1.5.1
1.4.30
1.4.29
1.4.28
1.4.27
1.4.26
1.4.25
1.4.24
1.4.23
1.4.22
1.4.21
1.4.20
1.4.19
1.4.18
1.4.17
1.4.16
1.4.15
1.4.14
1.4.13
1.4.11
1.4.10
1.4.9
1.4.8
1.4.7
1.4.6
1.4.5
1.4.4
1.4.3
1.4.2
1.4.1
1.4.0
1.3.1
1.3.0
1.2.0
1.1.0
1.0.10
1.0.9
1.0.8
1.0.7
1.0.6
1.0.5
1.0.4
1.0.3
1.0.2
1.0.1
1.0.0
0.48.6
0.48.5
0.48.4
0.48.3
0.48.2
0.48.1
0.48.0
0.47.1
0.47.0
0.46.3
0.46.1
0.46.0
0.45.3
0.45.2
0.45.1
0.45.0
0.44.2
0.44.1
0.44.0
0.43.3
0.43.2
0.43.1
0.43.0
0.42.9
0.42.8
0.42.7
0.42.6
0.42.5
0.42.4
0.42.3
0.42.2
0.42.1
0.42.0
0.41.1
0.41.0
0.40.1
0.40.0
0.39.9
0.39.8
0.39.7
0.39.6
0.39.5
0.39.4
0.39.3
0.39.2
0.39.1
0.39.0
0.38.8
0.38.7
0.38.6
0.38.5
0.38.4
0.38.3
0.38.2
0.38.1
0.38.0
0.37.7
0.37.6
0.37.5
0.37.4
0.37.3
0.37.2
0.37.1
0.37.0
0.36.6
0.36.5
0.36.4
0.36.3
0.36.2
0.36.1
0.36.0
0.35.4
0.35.3
0.35.2
0.35.1
0.35.0
0.34.1
0.34.0
0.33.1
0.33.0
0.32.5
0.32.4
0.32.3
0.32.2
0.32.1
0.32.0
0.31.9
0.31.8
0.31.7
0.31.6
0.31.5
0.31.4
0.31.3
0.31.2
0.31.1
0.31.0
0.30.10
0.30.9
0.30.8
0.30.7
0.30.6
0.30.5
0.30.4
0.30.3
0.30.2
0.30.1
0.30.0
0.29.0
0.28.3
0.28.2
0.28.1
0.28.0
0.27.1
0.27.0
0.26.1
0.26.0
0.25.6
0.25.5
0.25.4
0.25.3
0.25.2
0.25.1
0.25.0
0.24.6
0.24.5
0.24.4
0.24.3
0.24.2
0.24.1
0.24.0
0.23.3
0.23.2
0.23.1
0.23.0
0.22.12
0.22.11
0.22.10
0.22.9
0.22.8
0.22.7
0.22.6
0.22.5
0.22.4
0.22.3
0.22.2
0.22.1
0.22.0
0.21.7
0.21.6
0.21.5
0.21.4
0.21.2
0.21.1
0.21.0
0.20.25
0.20.24
0.20.23
0.20.22
0.20.21
0.20.20
0.20.19
0.20.18
0.20.17
0.20.16
0.20.15
0.20.14
0.20.13
0.20.12
0.20.11
0.20.10
0.20.9
0.20.8
0.20.7
0.20.6
0.20.5
0.20.3
0.20.2
0.20.1
0.20.0
0.19.2
0.19.1
0.19.0
0.18.1
0.18.0
0.17.4
0.17.3
0.17.2
0.17.1
0.17.0
0.16.6
0.16.5
0.16.4
0.16.3
0.16.2
0.16.1
0.16.0
0.15.1
0.15.0
0.14.3
0.14.2
0.14.1
0.14.0
0.12.6
0.12.5
0.12.3
0.11.3
0.10.2
0.10.1
0.10.0
0.9.2
0.9.1
0.9.0
0.8.25
0.8.24
0.8.23
0.8.22
0.8.21
0.8.20
0.8.19
0.8.18
0.8.17
0.8.16
0.8.15
0.8.14
0.8.13
0.8.12
0.8.11
0.8.10
0.8.9
0.8.8
0.8.7
0.8.6
0.8.5
0.8.4
0.8.3
0.8.2
0.8.1
0.8.0
0.7.30
0.7.29
0.7.28
0.7.27
0.7.26
0.7.25
0.7.24
0.7.23
0.7.22
0.7.21
0.7.20
0.7.19
0.7.18
0.7.17
0.7.16
0.7.15
0.7.14
0.7.13
0.7.12
0.7.11
0.7.10
0.7.9
0.7.8
0.7.7
0.7.6
0.7.5
0.7.4
0.7.3
0.7.2
0.7.1
0.7.0
0.6.7
0.6.6
0.6.5
0.6.4
0.6.3
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
Current section
Files
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Files
src/macula_download.erl
%%%-------------------------------------------------------------------
%%% @doc Behaviour for supervised content downloads (the get/fetch side).
%%%
%%% `get_content/2' is a plain blocking call — no addressable pid to
%%% cancel it from outside. This is the consumer-side counterpart to
%%% `macula_feeder': `start_link/4,5' returns immediately with a pid,
%%% runs `macula:get_content/2' in a linked worker, delivers the
%%% outcome to `Module:handle_downloaded/2', and publishes
%%% `sharing.get_started_v1' / `sharing.get_completed_v1' mesh facts
%%% around the transfer — including `outcome => cancelled' if the
%%% download is cancelled before the get resolves.
%%%
%%% This is content sharing, not general-purpose RPC streaming — see
%%% `macula_streamer' / `macula_stream_sink' for that (`streaming.*'
%%% facts belong to that pair).
%%%
%%% == Example ==
%%%
%%% ```
%%% -module(doc_download).
%%% -behaviour(macula_download).
%%% -export([init/1, handle_downloaded/2]).
%%%
%%% init(Parent) -> {ok, Parent}.
%%%
%%% handle_downloaded(Result, Parent) ->
%%% Parent ! {downloaded, Result},
%%% {stop, normal, Parent}.
%%% '''
%%%
%%% ```
%%% {ok, Pid} = macula_download:start_link(doc_download, Pool, Realm,
%%% Mcid, self()).
%%% '''
%%% @end
%%%-------------------------------------------------------------------
-module(macula_download).
-behaviour(gen_server).
-export([start_link/4, start_link/5]).
-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_downloaded(Result :: {ok, binary()} | {error, term()}, State :: term()) ->
{noreply, NewState :: term()} | {stop, Reason :: term(), NewState :: term()}.
-define(GET_STARTED, <<"sharing.get_started_v1">>).
-define(GET_COMPLETED, <<"sharing.get_completed_v1">>).
-record(dstate, {
module :: module(),
pool :: macula:pool(),
realm :: macula:realm(),
announce :: boolean(),
share_id :: binary(),
worker :: pid(),
completed :: boolean(),
user :: term()
}).
%% @doc Start a download. Fetches `Mcid' via `Pool'.
-spec start_link(module(), macula:pool(), macula:realm(), macula:mcid()) ->
{ok, pid()} | {error, term()}.
start_link(Module, Pool, Realm, Mcid) ->
start_link(Module, Pool, Realm, Mcid, undefined).
%% @doc As `start_link/4', with `Args' passed to `Module:init/1'.
-spec start_link(module(), macula:pool(), macula:realm(), macula:mcid(), term()) ->
{ok, pid()} | {error, term()}.
start_link(Module, Pool, Realm, Mcid, Args) ->
gen_server:start_link(?MODULE, {Module, Pool, Realm, Mcid, true, Args}, []).
%% @doc Cancel an in-flight download. Publishes `sharing.get_completed_v1'
%% with `outcome => cancelled' if the get had not resolved yet.
-spec cancel(pid()) -> ok.
cancel(Pid) -> gen_server:stop(Pid).
%%%===================================================================
%%% gen_server callbacks
%%%===================================================================
%% @private
init({Module, Pool, Realm, Mcid, Announce, InitArgs}) ->
process_flag(trap_exit, true),
case Module:init(InitArgs) of
{ok, UserState} ->
ShareId = crypto:strong_rand_bytes(16),
publish(Announce, Pool, Realm, ?GET_STARTED,
#{share_id => ShareId, mcid => Mcid,
chunked => is_chunked_mcid(Mcid)}),
Worker = spawn_worker(Pool, Mcid),
{ok, #dstate{module = Module, pool = Pool, realm = Realm,
announce = Announce, share_id = ShareId,
worker = Worker, completed = false, user = UserState}};
{stop, Reason} ->
{stop, Reason}
end.
spawn_worker(Pool, Mcid) ->
Parent = self(),
spawn_link(fun() ->
Result = macula:get_content(Pool, Mcid),
Parent ! {download_result, Result}
end).
%% @private
handle_call(_Request, _From, State) ->
{reply, {error, unsupported}, State}.
%% @private
handle_cast(_Msg, State) -> {noreply, State}.
%% @private
handle_info({download_result, Result}, State) ->
NewState = announce_completed(State, Result),
#dstate{module = Module, user = User} = NewState,
deliver(Module:handle_downloaded(Result, User), NewState);
handle_info({'EXIT', Worker, Reason}, #dstate{worker = Worker} = State)
when Reason =/= normal ->
{stop, {worker_crashed, Reason}, State};
handle_info(_Msg, State) ->
{noreply, State}.
deliver({noreply, NewUser}, State) -> {noreply, State#dstate{user = NewUser}};
deliver({stop, Reason, NewUser}, State) -> {stop, Reason, State#dstate{user = NewUser}}.
%% @private
terminate(_Reason, #dstate{worker = Worker, completed = true}) ->
unlink(Worker),
exit(Worker, kill),
ok;
terminate(_Reason, State) ->
unlink(State#dstate.worker),
exit(State#dstate.worker, kill),
_ = announce_completed(State, {error, cancelled}),
ok.
announce_completed(#dstate{completed = true} = State, _Result) ->
State;
announce_completed(#dstate{pool = Pool, realm = Realm, announce = Announce,
share_id = ShareId} = State, Result) ->
publish(Announce, Pool, Realm, ?GET_COMPLETED,
outcome_fields(#{share_id => ShareId}, Result)),
State#dstate{completed = true}.
outcome_fields(Base, {ok, Bytes}) ->
Base#{outcome => completed, size => byte_size(Bytes)};
outcome_fields(Base, {error, cancelled}) ->
Base#{outcome => cancelled};
outcome_fields(Base, {error, Reason}) ->
Base#{outcome => failed, reason => Reason}.
is_chunked_mcid(<<1, 16#56, _/binary>>) -> true;
is_chunked_mcid(_) -> false.
publish(false, _, _, _, _) -> ok;
publish(true, Pool, Realm, Topic, Payload) ->
_ = macula:publish(Pool, Realm, Topic, Payload), ok.