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%% @doc SEB-Shrew Bridge — NATS sovereign.shrew.worm.v1 → SEB lattice
%%
%% Every SkerProven or SkerShrewd verdict on sovereign.shrew.worm.v1
%% becomes a 64-byte payload appended to the SEB WORM chain.
%%
%% Payload layout (64 bytes, matches seb_convergence.mjs):
%% [0:8] event_type uint64 LE: 0x0600=SHREW_PROVEN, 0x0601=SHREW_SHREWD
%% [8:16] tick uint64 LE: Shrew tick counter
%% [16:24] timestamp uint64 LE: Unix ms
%% [24:56] agent_hash 32 bytes: SHA-256 of agent_key
%% [56:64] seal_head 8 bytes: first 8 bytes of shrew_seal
%%
%% The Shrew runtime runs at 1000Hz (sovereign-shrew.service, SCHED_FIFO/80).
%% This bridge subscribes to the WORM-eligible subset only.
%% attach to the SEB kernel via seb_kernel_nif:append_event/4.
%%
%% NATS connection: NATS_URL env var (default nats://127.0.0.1:4222)
%% @end
%%%-------------------------------------------------------------------
-module(seb_shrew_bridge).
-behaviour(gen_server).
-export([start_link/0]).
-export([init/1, handle_call/3, handle_cast/2, handle_info/2,
terminate/2, code_change/3]).
-define(SERVER, ?MODULE).
-define(SHREW_WORM_SUBJECT, <<"sovereign.shrew.worm.v1">>).
-define(SHREWD_INFER_SUBJECT, <<"sovereign.shrewd.inference.v1">>).
%% SEB event type codes for Shrew verdicts
-define(EVENT_SHREW_PROVEN, 16#0600).
-define(EVENT_SHREW_SHREWD, 16#0601).
-define(EVENT_SHREWD_GOVERN, 16#0602). %% GovernanceCommand from SHREWD unit
-record(state, {
nats_conn :: pid() | undefined,
kernel :: reference() | undefined,
tick_sealed :: non_neg_integer()
}).
%%%===================================================================
%%% API
%%%===================================================================
start_link() ->
gen_server:start_link({local, ?SERVER}, ?MODULE, [], []).
%%%===================================================================
%%% gen_server callbacks
%%%===================================================================
init([]) ->
%% Connect to NATS
NatsUrl = os:getenv("NATS_URL", "nats://127.0.0.1:4222"),
Conn = case teacupnats:connect(NatsUrl) of
{ok, C} -> C;
{error, _} -> undefined
end,
%% Init SEB kernel on segment 6 (Shrew layer)
Kernel = case seb_kernel_nif:init_kernel(6, 0) of
{ok, H} -> H;
{error, _} -> undefined
end,
%% Subscribe to WORM-eligible verdicts
case Conn of
undefined -> ok;
C ->
teacupnats:sub(C, ?SHREW_WORM_SUBJECT),
teacupnats:sub(C, ?SHREWD_INFER_SUBJECT)
end,
{ok, #state{nats_conn = Conn, kernel = Kernel, tick_sealed = 0}}.
handle_info({nats, msg, #{subject := ?SHREW_WORM_SUBJECT, body := Body}}, State) ->
NewState = handle_shrew_worm(Body, State),
{noreply, NewState};
handle_info({nats, msg, #{subject := ?SHREWD_INFER_SUBJECT, body := Body}}, State) ->
NewState = handle_shrewd_governance(Body, State),
{noreply, NewState};
handle_info(_Info, State) ->
{noreply, State}.
handle_call(_Req, _From, State) -> {reply, ok, State}.
handle_cast(_Msg, State) -> {noreply, State}.
terminate(_Reason, _State) -> ok.
code_change(_OldVsn, State, _Extra) -> {ok, State}.
%%%===================================================================
%%% Internal — Shrew WORM entry → SEB lattice append
%%%===================================================================
handle_shrew_worm(Body, #state{kernel = undefined} = State) ->
error_logger:warning_msg("[SHREW_BRIDGE] kernel not connected, dropping: ~p~n",
[byte_size(Body)]),
State;
handle_shrew_worm(Body, #state{kernel = Kernel, tick_sealed = N} = State) ->
case catch jiffy:decode(Body, [return_maps]) of
{'EXIT', _} ->
State;
Entry ->
Verdict = maps:get(<<"verdict">>, Entry, <<"SKER_NOISE">>),
Tick = maps:get(<<"tick">>, Entry, 0),
Ts = maps:get(<<"ts">>, Entry, 0),
AgentKey = maps:get(<<"agent_key">>, Entry, <<>>),
Seal = maps:get(<<"shrew_seal">>,Entry, <<>>),
EventType = case Verdict of
<<"SKER_PROVEN">> -> ?EVENT_SHREW_PROVEN;
<<"SKER_SHREWD">> -> ?EVENT_SHREW_SHREWD;
_ -> ?EVENT_SHREW_PROVEN %% only WORM-eligible arrive here
end,
Payload = build_payload(EventType, Tick, Ts, AgentKey, Seal),
Header = build_header(EventType, byte_size(Payload)),
%% Get current tip for hash chain
{ok, PrevTip} = seb_kernel_nif:get_tip_hash(Kernel),
Footer = build_footer(PrevTip, Payload),
case seb_kernel_nif:append_event(Kernel, Header, Payload, Footer) of
{ok, Offset} ->
if N rem 100 =:= 0 ->
error_logger:info_msg(
"[SHREW_BRIDGE] ~s tick=~p offset=~p total=~p~n",
[Verdict, Tick, Offset, N+1]);
true -> ok
end,
State#state{tick_sealed = N + 1};
{error, Reason} ->
error_logger:error_msg(
"[SHREW_BRIDGE] append failed tick=~p: ~p~n", [Tick, Reason]),
State
end
end.
handle_shrewd_governance(Body, #state{kernel = Kernel} = State) ->
%% GovernanceCommand from SHREWD unit → seal as 0x0602 event
case catch jiffy:decode(Body, [return_maps]) of
{'EXIT', _} -> State;
Cmd ->
Command = maps:get(<<"command">>, Cmd, <<"UNKNOWN">>),
Ts = erlang:system_time(millisecond),
Payload = build_governance_payload(Command, Ts),
Header = build_header(?EVENT_SHREWD_GOVERN, byte_size(Payload)),
{ok, PrevTip} = seb_kernel_nif:get_tip_hash(Kernel),
Footer = build_footer(PrevTip, Payload),
case seb_kernel_nif:append_event(Kernel, Header, Payload, Footer) of
{ok, _} -> ok;
{error, R} ->
error_logger:warning_msg("[SHREW_BRIDGE] governance seal failed: ~p~n", [R])
end,
State
end.
%%%===================================================================
%%% Wire builders
%%%===================================================================
%% 64-byte payload: event_type(8) tick(8) ts(8) agent_sha256(32) seal_head(8)
build_payload(EventType, Tick, Ts, AgentKey, Seal) ->
AgentHash = crypto:hash(sha256, AgentKey), %% 32 bytes
SealHead = binary:part(
crypto:hash(sha256, Seal), 0, 8), %% 8 bytes
<<EventType:64/little-unsigned,
Tick:64/little-unsigned,
Ts:64/little-unsigned,
AgentHash/binary,
SealHead/binary>>.
%% 64-byte governance payload: event_type(8) ts(8) command_sha256(32) zeros(16)
build_governance_payload(Command, Ts) ->
CmdHash = crypto:hash(sha256, Command),
Zeros = binary:copy(<<0>>, 16),
<<(?EVENT_SHREWD_GOVERN):64/little-unsigned,
Ts:64/little-unsigned,
CmdHash/binary,
Zeros/binary>>.
%% 68-byte event header (matches seb_types.ads)
build_header(EventType, PayloadSize) ->
Ts = erlang:system_time(nanosecond),
<<EventType:64/little-unsigned,
Ts:64/little-unsigned,
0:64/little-unsigned, %% agent_id: Shrew bridge = 0
PayloadSize:32/little-unsigned,
6:32/little-unsigned, %% partition_id: Shrew = 6
0:64/little-unsigned, %% prev_offset
0:64/little-unsigned, %% sequence_no
0:64/little-unsigned, %% reserved
0:32/little-unsigned, %% reserved2
0:32/little-unsigned>>. %% reserved3
%% 128-byte footer: prev_hash(32) event_hash(32) sig(64)
%% event_hash = lattice circuit(prev_tip || header[0:64])
%% computed by the NIF — we send zeros and it fills commitment
build_footer(PrevTip, _Payload) ->
<<PrevTip/binary,
(binary:copy(<<0>>, 32))/binary, %% event_hash: NIF fills
(binary:copy(<<0>>, 64))/binary>>. %% signature: policy layer fills
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