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macula
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13.2.1
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12.11.1
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12.9.1
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12.5.1
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12.2.1
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12.0.0
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11.3.1
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10.25.0
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10.22.0
10.21.0
10.20.3
10.20.2
10.20.0
10.19.2
10.19.1
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10.14.5
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10.13.1
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10.10.1
10.10.0
10.9.1
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10.5.8
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10.1.1
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9.13.8
9.8.2
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9.3.1
9.3.0
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9.1.1
9.1.0
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8.7.0
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8.4.1
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5.2.2
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5.0.0
4.8.0
4.7.1
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4.4.10
4.4.9
4.4.8
4.4.7
4.4.6
4.4.5
4.4.4
4.4.3
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4.4.1
4.4.0
4.3.1
4.3.0
4.2.9
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4.2.1
4.2.0
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3.16.0
3.15.3
3.15.2
3.15.1
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3.13.0
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3.12.0
3.11.1
3.11.0
3.10.3
3.10.2
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2.1.1
2.1.0
2.0.0
1.5.2
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1.4.30
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1.4.9
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1.4.5
1.4.4
1.4.3
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1.4.1
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1.3.1
1.3.0
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1.0.10
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1.0.8
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1.0.3
1.0.2
1.0.1
1.0.0
0.48.6
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0.48.1
0.48.0
0.47.1
0.47.0
0.46.3
0.46.1
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0.45.1
0.45.0
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0.44.1
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0.43.3
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0.43.1
0.43.0
0.42.9
0.42.8
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0.42.6
0.42.5
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0.42.3
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0.42.1
0.42.0
0.41.1
0.41.0
0.40.1
0.40.0
0.39.9
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0.38.1
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0.37.6
0.37.5
0.37.4
0.37.3
0.37.2
0.37.1
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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
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0.26.1
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0.25.6
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0.24.2
0.24.1
0.24.0
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0.23.1
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0.22.0
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0.20.25
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0.20.1
0.20.0
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0.19.1
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0.18.1
0.18.0
0.17.4
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0.15.1
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0.14.3
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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
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0.8.11
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0.8.9
0.8.8
0.8.7
0.8.6
0.8.5
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0.8.3
0.8.2
0.8.1
0.8.0
0.7.30
0.7.29
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0.7.27
0.7.26
0.7.25
0.7.24
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0.5.0
0.4.4
0.4.3
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0.4.1
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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_request.erl
%%%-------------------------------------------------------------------
%%% @doc Behaviour for supervised RPC requests.
%%%
%%% `call/5' is a plain blocking call in the caller's own process —
%%% there is no addressable pid to cancel it from outside. This is the
%%% consumer-side counterpart to `macula_response': `start_link/6,7'
%%% returns immediately with a pid, runs `macula:call/5' in a linked
%%% worker, delivers the outcome to `Module:handle_reply/2', and
%%% publishes `rpc.sent_v1' / `rpc.completed_v1' mesh facts around the
%%% request — including `outcome => cancelled' if the request is
%%% cancelled before a reply arrives.
%%%
%%% == Call and publish functions ==
%%%
%%% `start_link/8' takes `call', the function the request calls with,
%%% `macula:call/5' by default. `start_link_direct/8' takes `direct_call',
%%% `macula_direct_dial:call/6' by default, which gets the other options.
%%% Both take `fact_publish', the function the request announces its facts
%%% with, `macula:publish/4' by default. A test gives its own functions
%%% this way instead of replacing a module.
%%%
%%% == Example ==
%%%
%%% ```
%%% -module(add_caller).
%%% -behaviour(macula_request).
%%% -export([init/1, handle_reply/2]).
%%%
%%% init(Parent) -> {ok, Parent}.
%%%
%%% handle_reply(Result, Parent) ->
%%% Parent ! {add_result, Result},
%%% {stop, normal, Parent}.
%%% '''
%%%
%%% ```
%%% {ok, Pid} = macula_request:start_link(add_caller, Pool, Realm,
%%% <<"math.add_v1">>, #{a => 2, b => 3}, 30_000, self()).
%%% '''
%%%
%%% == Direct-dial ==
%%%
%%% Both starts reach a provider the same way. `macula:call/5' resolves
%%% the procedure's `procedure_advertisement' from the DHT (published by
%%% `macula_response:advertise_direct/6' on the provider side), resolves
%%% that record's `serving_station' to a dialable endpoint via the
%%% station's own `station_endpoint' record (every macula-station
%%% publishes its own automatically), and calls the advertised provider
%%% there in one hop via `macula:call_station/8'. `start_link_direct'
%%% also hands its options to that resolution. Requires the provider to
%%% have advertised via `advertise_direct/6', not plain `advertise/5':
%%% a plain advertise publishes no discoverable record.
%%% @end
%%%-------------------------------------------------------------------
-module(macula_request).
-behaviour(gen_server).
-export([start_link/6, start_link/7, start_link/8]).
-export([start_link_direct/6, start_link_direct/7, start_link_direct/8]).
-export_type([call/0, direct_call/0, start_opts/0, direct_opts/0]).
-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_reply(Result :: {ok, term()} | {error, term()}, State :: term()) ->
{noreply, NewState :: term()} | {stop, Reason :: term(), NewState :: term()}.
-optional_callbacks([]).
-define(REQUEST_SENT, <<"rpc.sent_v1">>).
-define(REQUEST_COMPLETED, <<"rpc.completed_v1">>).
-type call() :: fun((macula:pool(), macula:realm(), macula:procedure(), term(),
pos_integer()) -> {ok, term()} | {error, term()}).
-type direct_call() :: fun((macula:pool(), macula:realm(), macula:procedure(), term(),
pos_integer(), map()) -> {ok, term()} | {error, term()}).
-type start_opts() :: #{call => call(), fact_publish => macula_lifetime_announcer:publish()}.
-type direct_opts() :: #{direct_call => direct_call(),
fact_publish => macula_lifetime_announcer:publish(),
atom() => term()}.
-record(qstate, {
module :: module(),
pool :: macula:pool(),
realm :: macula:realm(),
announce :: boolean(),
fact_publish :: macula_lifetime_announcer:publish(),
request_id :: binary(),
worker :: pid(),
completed :: boolean(),
user :: term()
}).
%% @doc Start a request. Calls `Procedure' on `(Pool, Realm)' with
%% `Payload', timing out after `TimeoutMs'; `Args' is passed to
%% `Module:init/1'.
-spec start_link(module(), macula:pool(), macula:realm(), macula:procedure(),
term(), 1..600_000) -> {ok, pid()} | {error, term()}.
start_link(Module, Pool, Realm, Procedure, Payload, TimeoutMs) ->
start_link(Module, Pool, Realm, Procedure, Payload, TimeoutMs, undefined).
%% @doc As `start_link/6', with `Args' passed to `Module:init/1'.
-spec start_link(module(), macula:pool(), macula:realm(), macula:procedure(),
term(), 1..600_000, term()) -> {ok, pid()} | {error, term()}.
start_link(Module, Pool, Realm, Procedure, Payload, TimeoutMs, Args) ->
start_link(Module, Pool, Realm, Procedure, Payload, TimeoutMs, Args, #{}).
%% @doc As `start_link/7', with options: `call' and `fact_publish' give
%% the functions the request calls and announces with (see "Call and
%% publish functions" above).
-spec start_link(module(), macula:pool(), macula:realm(), macula:procedure(),
term(), 1..600_000, term(), start_opts()) ->
{ok, pid()} | {error, term()}.
start_link(Module, Pool, Realm, Procedure, Payload, TimeoutMs, Args, Opts)
when is_integer(TimeoutMs), TimeoutMs > 0, TimeoutMs =< 600_000, is_map(Opts) ->
start(arity_5(maps:get(call, Opts, fun macula:call/5)), Opts,
{Module, Pool, Realm, Procedure, Payload, TimeoutMs, Args}).
%% @doc As `start_link/6', but resolves and dials the serving station
%% directly instead of routing through the pool's existing links. See
%% the "Direct-dial" section above.
-spec start_link_direct(module(), macula:pool(), macula:realm(),
macula:procedure(), term(), 1..600_000) ->
{ok, pid()} | {error, term()}.
start_link_direct(Module, Pool, Realm, Procedure, Payload, TimeoutMs) ->
start_link_direct(Module, Pool, Realm, Procedure, Payload, TimeoutMs, undefined).
%% @doc As `start_link_direct/6', with `Args' passed to `Module:init/1'.
-spec start_link_direct(module(), macula:pool(), macula:realm(),
macula:procedure(), term(), 1..600_000, term()) ->
{ok, pid()} | {error, term()}.
start_link_direct(Module, Pool, Realm, Procedure, Payload, TimeoutMs, Args) ->
start_link_direct(Module, Pool, Realm, Procedure, Payload, TimeoutMs,
Args, #{}).
%% @doc As `start_link_direct/7', with options: `direct_call' and
%% `fact_publish' give the functions the request calls and announces with
%% (see "Call and publish functions" above), and the other options go to
%% the call as `macula_direct_dial:call/6' takes them. An org namespaced
%% procedure's authorization is checked against the realm key the pool
%% pinned (see `macula_direct_dial''s module doc, "Trust model").
-spec start_link_direct(module(), macula:pool(), macula:realm(),
macula:procedure(), term(), 1..600_000, term(),
direct_opts()) -> {ok, pid()} | {error, term()}.
start_link_direct(Module, Pool, Realm, Procedure, Payload, TimeoutMs, Args, Opts)
when is_integer(TimeoutMs), TimeoutMs > 0, TimeoutMs =< 600_000, is_map(Opts) ->
DirectCall = arity_6(maps:get(direct_call, Opts, fun macula_direct_dial:call/6)),
DialOpts = maps:without([direct_call, fact_publish], Opts),
Call = fun(CallPool, CallRealm, CallProcedure, CallPayload, CallTimeoutMs) ->
DirectCall(CallPool, CallRealm, CallProcedure, CallPayload, CallTimeoutMs,
DialOpts)
end,
start(Call, Opts, {Module, Pool, Realm, Procedure, Payload, TimeoutMs, Args}).
%% A request starts with its call function and the options' fact publish
%% function, or macula:publish/4 without one. A function option of the
%% wrong arity is refused with function_clause, in the caller.
start(Call, Opts, {Module, Pool, Realm, Procedure, Payload, TimeoutMs, Args}) ->
FactPublish = arity_4(maps:get(fact_publish, Opts, fun macula:publish/4)),
gen_server:start_link(?MODULE,
{Call, FactPublish, Module, Pool, Realm, Procedure, Payload,
TimeoutMs, true, Args}, []).
arity_4(Fun) when is_function(Fun, 4) -> Fun.
arity_5(Fun) when is_function(Fun, 5) -> Fun.
arity_6(Fun) when is_function(Fun, 6) -> Fun.
%% @doc Cancel an in-flight request. Publishes `rpc.completed_v1' with
%% `outcome => cancelled' if no reply had arrived yet.
-spec cancel(pid()) -> ok.
cancel(Pid) -> gen_server:stop(Pid).
%%%===================================================================
%%% gen_server callbacks
%%%===================================================================
%% @private
init({Call, FactPublish, Module, Pool, Realm, Procedure, Payload, TimeoutMs, Announce,
InitArgs}) ->
process_flag(trap_exit, true),
case Module:init(InitArgs) of
{ok, UserState} ->
RequestId = crypto:strong_rand_bytes(16),
publish(FactPublish, Announce, Pool, Realm, ?REQUEST_SENT,
#{request_id => RequestId}),
Worker = spawn_worker(Call, Pool, Realm, Procedure, Payload, TimeoutMs),
{ok, #qstate{module = Module, pool = Pool, realm = Realm,
announce = Announce, fact_publish = FactPublish,
request_id = RequestId,
worker = Worker, completed = false, user = UserState}};
{stop, Reason} ->
{stop, Reason}
end.
spawn_worker(Call, Pool, Realm, Procedure, Payload, TimeoutMs) ->
Parent = self(),
spawn_link(fun() ->
Result = Call(Pool, Realm, Procedure, Payload, TimeoutMs),
Parent ! {request_result, Result}
end).
%% @private
handle_call(_Request, _From, State) ->
{reply, {error, unsupported}, State}.
%% @private
handle_cast(_Msg, State) -> {noreply, State}.
%% @private
handle_info({request_result, Result}, State) ->
NewState = announce_completed(State, Result),
#qstate{module = Module, user = User} = NewState,
deliver(Module:handle_reply(Result, User), NewState);
handle_info({'EXIT', Worker, Reason}, #qstate{worker = Worker} = State)
when Reason =/= normal ->
{stop, {worker_crashed, Reason}, State};
handle_info(_Msg, State) ->
{noreply, State}.
deliver({noreply, NewUser}, State) -> {noreply, State#qstate{user = NewUser}};
deliver({stop, Reason, NewUser}, State) -> {stop, Reason, State#qstate{user = NewUser}}.
%% @private
terminate(_Reason, #qstate{worker = Worker, completed = true}) ->
unlink(Worker),
exit(Worker, kill),
ok;
terminate(_Reason, State) ->
unlink(State#qstate.worker),
exit(State#qstate.worker, kill),
_ = announce_completed(State, {error, cancelled}),
ok.
announce_completed(#qstate{completed = true} = State, _Result) ->
State;
announce_completed(#qstate{pool = Pool, realm = Realm, announce = Announce,
fact_publish = FactPublish,
request_id = RequestId} = State, Result) ->
publish(FactPublish, Announce, Pool, Realm, ?REQUEST_COMPLETED,
outcome_fields(#{request_id => RequestId}, Result)),
State#qstate{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(_FactPublish, false, _, _, _, _) -> ok;
publish(FactPublish, true, Pool, Realm, Topic, Payload) ->
_ = FactPublish(Pool, Realm, Topic, Payload), ok.