we now spy keyblocks for spends, need to test but probably close to working

ok so next step is go on the server side
- extract recipient, amount, payload,
- register search pattern
- wait for matching transaction to appear
- notify correct party

NOTES.txt

@@ -1,3 +1,9 @@
+2026-02-25(PRH):
+    grids: instead of spying the chain for a tx, let's use dead drop
+
+    - so for "generate", need to form tx for the user to sign
+    - make dead drop -> have process that knows each tx and the dead drop location
+
 OPEN LOOPS - 2025-11-12
     - websockets
         - separate websocket handling from websocket parsing/sending

priv/static/grids-basic.html

@@ -35,13 +35,14 @@
         <label for="grids-a">Amount (P):</label>
         <input type  = "number"
                id    = "grids-a"
-               value = "6000000">
+               value = "69"
+               disabled>
         <br>
 
         <label for="grids-p">Payload:</label>
         <input type  = "text"
                id    = "grids-p"
-               value = "test payload">
+               disabled>
         <br>
 
         <input type  = "button"

priv/static/js/dist/grids-basic.js

@@ -20,6 +20,10 @@ async function main() {
     let submit_btn = document.getElementById('grids-submit');
     let grids_url_elt = document.getElementById('grids-url');
     let grids_png_elt = document.getElementById('grids-png');
+    let rand_data = new Uint8Array(32);
+    window.crypto.getRandomValues(rand_data);
+    let hex = rand_data.toHex().toUpperCase();
+    p_input.value = 'text payload ' + hex;
     // Page initialization
     submit_btn.addEventListener('click', async function (e) {
         await on_submit(n_input, r_input, a_input, p_input, grids_url_elt, grids_png_elt);
@@ -59,7 +63,7 @@ async function grids_request(net_id, recipient, amount, payload) {
         'amount': amount,
         'payload': payload };
     let obj_text = JSON.stringify(obj, undefined, 4);
-    let url = '/grids-spend';
+    let url = '/grids-mkdd';
     let req_options = { method: 'POST',
         headers: { 'content-type': 'application/json' },
         body: obj_text };

priv/static/js/dist/grids-basic.js.map

@@ -1 +1 @@
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priv/static/js/dist/libfewd.js.map

@@ -1 +1 @@
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+{"version":3,"file":"libfewd.js","sourceRoot":"","sources":["../ts/libfewd.ts"],"names":[],"mappings":"AAAA;;;;GAIG;AAEH,OAAO,EACH,WAAW,EACX,qBAAqB,EACxB,CAAC;AAGF,SACA,WAAW,CACN,gBAAmC,EACnC,cAAsC,EACtC,UAAyB;IAG1B,+DAA+D;IAC/D,IAAI,gBAAgB,CAAC,OAAO,EAAE,CAAC;QAC3B,IAAI,aAAa,GAAW,cAAc,CAAC,YAAY,CAAC;QACxD,sCAAsC;QACtC,IAAI,aAAa,GAAG,UAAU;YAC1B,cAAc,CAAC,KAAK,CAAC,MAAM,GAAG,MAAM,CAAC,aAAa,CAAC,GAAG,IAAI,CAAC;;YAE3D,cAAc,CAAC,KAAK,CAAC,MAAM,GAAG,MAAM,CAAC,UAAU,CAAC,GAAG,IAAI,CAAC;IAChE,CAAC;AACL,CAAC;AAGD,SACA,qBAAqB,CAChB,gBAAmC,EACnC,cAAsC;IAGvC,IAAI,gBAAgB,CAAC,OAAO,EAAE,CAAC;QAC3B,mBAAmB;QACnB,cAAc,CAAC,SAAS,GAAG,cAAc,CAAC,YAAY,CAAC;IAC3D,CAAC;AACL,CAAC"}

priv/static/js/dist/wfc.js.map

@@ -1 +1 @@
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+{"version":3,"file":"wfc.js","sourceRoot":"","sources":["../ts/wfc.ts"],"names":[],"mappings":"AAAA;;;;GAIG;AAEH,OAAO,KAAK,OAAO,MAAM,cAAc,CAAA;AAEvC,oEAAoE;AACpE,qBAAqB;AACrB,oEAAoE;AAEpE,IAAI,EAAE,CAAC;AAEP,SACA,IAAI;IAIA,IAAI,IAAI,GAAoC,QAAQ,CAAC,cAAc,CAAC,WAAW,CAA8B,CAAK;IAClH,IAAI,IAAI,GAAoC,QAAQ,CAAC,cAAc,CAAC,YAAY,CAAgC,CAAE;IAClH,IAAI,SAAS,GAA+B,QAAQ,CAAC,cAAc,CAAC,oBAAoB,CAAqB,CAAK;IAClH,IAAI,SAAS,GAA+B,QAAQ,CAAC,cAAc,CAAC,aAAa,CAA4B,CAAK;IAClH,IAAI,eAAe,GAAyB,GAAG,CAAC;IAGhD,IAAI,CAAC,gBAAgB,CAAC,SAAS,EAC3B,UAAS,CAAgB;QACrB,YAAY,CAAC,CAAC,EAAE,IAAI,EAAE,IAAI,EAAE,SAAS,EAAE,SAAS,EAAE,eAAe,CAAC,CAAC;IACvE,CAAC,CACJ,CAAC;AACN,CAAC;AAGD,yBAAyB;AACzB,KAAK,UACL,YAAY,CACP,GAA0B,EAC1B,IAA6B,EAC7B,IAAgC,EAChC,SAA6B,EAC7B,SAA6B,EAC7B,UAAmB;IAGpB,IAAI,GAAG,CAAC,GAAG,KAAK,OAAO,EAAE,CAAC;QACtB,yBAAyB;QACzB,GAAG,CAAC,cAAc,EAAE,CAAC;QACrB,gBAAgB;QAChB,IAAI,QAAQ,GAAa,IAAI,CAAC,KAAK,CAAC;QACpC,IAAI,OAAO,GAAc,QAAQ,CAAC,IAAI,EAAE,CAAC;QACzC,IAAI,QAAQ,GAAa,OAAO,CAAC,MAAM,GAAG,CAAC,CAAC;QAC5C,2BAA2B;QAC3B,IAAI,QAAQ,EAAE,CAAC;YACX,cAAc;YACd,IAAI,CAAC,KAAK,GAAG,EAAE,CAAC;YAEhB,gBAAgB;YAChB,IAAI,CAAC,KAAK,IAAI,IAAI,GAAG,OAAO,GAAG,IAAI,CAAC;YACpC,IAAI,CAAC,MAAM,GAAG,KAAK,CAAC;YAEpB,2BAA2B;YAC3B,IAAI,MAAM,GAAY,MAAM,WAAW,CAAC,OAAO,CAAC,CAAC;YAEjD,IAAI,MAAM,CAAC,EAAE;gBACT,IAAI,CAAC,KAAK,IAAI,MAAM,CAAC,MAAM,CAAC;;gBAE5B,IAAI,CAAC,KAAK,IAAI,MAAM,CAAC,KAAK,CAAC;YAC/B,IAAI,CAAC,KAAK,IAAI,IAAI,CAAC;YAEnB,cAAc;YACd,OAAO,CAAC,WAAW,CAAC,SAAS,EAAE,IAAI,EAAE,UAAU,CAAC,CAAC;YACjD,OAAO,CAAC,qBAAqB,CAAC,SAAS,EAAE,IAAI,CAAC,CAAC;QACnD,CAAC;IACL,CAAC;AACL,CAAC;AAaD,SACA,MAAM,CACD,SAAmB,EACnB,QAAkB;IAGnB,IAAG,CAAC,SAAS;QACT,MAAM,IAAI,KAAK,CAAC,QAAQ,CAAC,CAAC;AAClC,CAAC;AAGD,KAAK,UACL,WAAW,CACN,SAAkB;IAGnB,IAAI,YAAY,GAAG,EAAC,KAAK,EAAE,SAAS,EAAC,CAAC;IACtC,IAAI,YAAY,GAAG,IAAI,CAAC,SAAS,CAAC,YAAY,CAAC,CAAC;IAEhD,IAAI,WAAW,GAAI,EAAC,MAAM,EAAG,MAAM;QACf,OAAO,EAAE,EAAC,cAAc,EAAE,kBAAkB,EAAC;QAC7C,IAAI,EAAK,YAAY,EAAC,CAAC;IAE3C,mEAAmE;IACnE,4CAA4C;IAC5C,IAAI,MAAM,GAAW,EAAC,EAAE,EAAM,KAAK;QACb,KAAK,EAAG,kCAAkC,EAAC,CAAC;IAElE,IAAI,CAAC;QACD,IAAI,QAAQ,GAAc,MAAM,KAAK,CAAC,QAAQ,EAAE,WAAW,CAAC,CAAC;QAC7D,IAAI,QAAQ,CAAC,EAAE;YACX,MAAM,GAAG,MAAM,QAAQ,CAAC,IAAI,EAAY,CAAC;aACxC,CAAC;YACF,OAAO,CAAC,GAAG,CAAC,oBAAoB,EAAE,QAAQ,CAAC,CAAC;YAC5C,MAAM,GAAG,EAAC,EAAE,EAAE,KAAK,EAAE,KAAK,EAAE,mBAAmB,EAAC,CAAC;QACrD,CAAC;IACL,CAAC;IACD,OAAO,CAAM,EAAE,CAAC;QACZ,OAAO,CAAC,GAAG,CAAC,gBAAgB,EAAE,CAAC,CAAC,CAAC;QACjC,MAAM,GAAG,EAAC,EAAE,EAAE,KAAK,EAAE,KAAK,EAAE,eAAe,EAAC,CAAC;IACjD,CAAC;IAED,OAAO,MAAM,CAAC;AAClB,CAAC"}

priv/static/js/ts/grids-basic.ts

@@ -27,6 +27,11 @@ main
     let grids_url_elt = document.getElementById('grids-url') as HTMLTextAreaElement;
     let grids_png_elt = document.getElementById('grids-png') as HTMLImageElement;
 
+    let rand_data : Uint8Array = new Uint8Array(32);
+    window.crypto.getRandomValues(rand_data);
+    let hex : string = rand_data.toHex().toUpperCase();
+    p_input.value = 'text payload ' + hex;
+
     // Page initialization
     submit_btn.addEventListener(
         'click',
@@ -103,7 +108,7 @@ grids_request
     let obj_text : string = JSON.stringify(obj, undefined, 4);
 
 
-    let url = '/grids-spend';
+    let url = '/grids-mkdd';
     let req_options  = {method:  'POST',
                         headers: {'content-type': 'application/json'},
                         body:    obj_text};

src/fd_gridsd.erl

@@ -9,7 +9,7 @@
 
 -export([
     %% caller context
-    mk_spend/4,
+    mkdd/4,
 
     %% api
     start_link/0,
@@ -21,17 +21,18 @@
 
 -include("$zx_include/zx_logger.hrl").
 
-%% for craig's autism
+-type hex() :: binary().
--record(sp,
+-define(SEC, 1).
-        {recipient :: string(),
+-define(MIN, 60*SEC).
-         amount    :: non_neg_integer(),
+-define(DEAD_DROP_TTL, 30*MIN).
-         payload   :: binary()}).
 
--type search_pattern() :: #sp{}.
+-record(dd,
--type sp() :: search_pattern().
+        {created_at :: integer(),
+         payload    :: string()}).
+-type dd()  :: #dd{}.
 
 -record(s,
-        {looking_for = [] :: [{sp(), NotifyWhenSeen :: pid()}]}).
+        {drops = #{} :: #{hex() := dd()}}).
 
 -type state() :: #s{}.
 
@@ -40,7 +41,7 @@
 %% caller context
 %%-----------------------------------------------------------------------------
 
--spec mk_spend(NetworkId, Recipient, Amount, Payload) -> Result
+-spec mkdd(NetworkId, Recipient, Amount, Payload) -> Result
     when NetworkId :: string(),
          Recipient :: string(),
          Amount    :: non_neg_integer(),
@@ -50,10 +51,10 @@
          URL       :: string(),
          QR_PNG    :: binary().
 % @doc
-% Very important: amount MUST be an integer >= 0
+% make a dead drop
 
-mk_spend(NetworkId, Recipient, Amount, Payload) ->
+mkdd(NetworkId, Recipient, Amount, Payload) ->
-    gen_server:call(?MODULE, {mk_spend, NetworkId, Recipient, Amount, Payload}).
+    gen_server:call(?MODULE, {mkdd, NetworkId, Recipient, Amount, Payload}).
 
 
 %% gen_server callbacks
@@ -73,12 +74,10 @@ init(none) ->
     {ok, InitState}.
 
 
-handle_call({mk_spend, NetworkId, Recipient, Amount, Payload}, From, State) ->
+handle_call({mkdd, NetworkId, Recipient, Amount, Payload}, From, State) ->
-    case i_mk_spend(NetworkId, Recipient, Amount, Payload, From, State) of
+    case do_mkdd(NetworkId, Recipient, Amount, Payload, State) of
-        {ok, URL, PNG, NewState} ->
+        {ok, URL, PNG, NewState} -> {reply, {ok, URL, PNG}, NewState};
-            {reply, {ok, URL, PNG}, NewState};
+        Error                    -> {reply, Error, State}
-        Error ->
-            {reply, Error, State}
     end;
 handle_call(Unexpected, From, State) ->
     tell("~tp: unexpected call from ~tp: ~tp", [?MODULE, Unexpected, From]),
@@ -106,67 +105,46 @@ terminate(_, _) ->
 %% internals
 %%-----------------------------------------------------------------------------
 
--spec i_mk_spend(NetworkId, Recipient, Amount, Payload, From, State) -> Result
+-spec do_mkdd(NetworkId, Recipient, Amount, Payload, State) -> Result
     when NetworkId :: string(),
          Recipient :: string(),
-         Amount    :: non_neg_integer(),
+         Amount    :: pos_integer(),
          Payload   :: binary(),
-         From      :: {pid(), reference()},
          State     :: state(),
          Result    :: {ok, URL, QR_PNG, NewState}
-                    | {error, string()},
+                    | {error, Reason},
          URL      :: string(),
          QR_PNG   :: binary(),
-         NewState  :: state().
+         NewState :: state(),
+         Reason   :: any().
 
-i_mk_spend(NetworkId, Recipient, Amount, Payload, {FromPID, _}, State)
+do_mkdd(NetId, Recipient, Amount, Payload, State = #s{drops = Drops}) ->
-        when is_integer(Amount), Amount >= 0,
+    HexStr    = rand_hex(),
-             is_binary(Payload) ->
+    CreatedAt = now_sec(),
-    URL       = gmgrids:encode({spend, NetworkId, Recipient},
+    TxStr     = form_txstr(NetId, Recipient, Amount, Payload),
-                               [{amount, Amount},
+    DD        = #dd{created_at = CreatedAt, payload = TxStr},
-                                {payload, Payload}]),
+    URL       = dd_url(HexStr),
-    URLBin    = unicode:characters_to_binary(URL),
+    PNG       = qr:encode_png(unicode:characters_to_binary(URL)),
-    PNG       = qr:encode_png(URLBin),
+    NewDrops  = maps:put(HexStr, DD, Drops),
-    case i_register(Recipient, Amount, Payload, FromPID, State) of
+    NewState  = State#s{drops = NewDrops},
-        {ok, NewState} -> {ok, URL, PNG, NewState};
+    {ok, URL, PNG, NewState}.
-        Error          -> Error
+
-    end;
+now_sec() ->
-i_mk_spend(_, _, Amount, _, _, _) when (not is_integer(Amount)) ->
+    calendar:datetime_to_gregorian_seconds(calendar:universal_time()).
-    {error, "non_integer_amount"};
-i_mk_spend(_, _, Amount, _, _, _) when Amount < 0 ->
-    {error, "negative_amount"};
-i_mk_spend(_, _, _, _, _, _) ->
-    {error, "bad_payload"}.
 
 
-i_register(Recipient, Amount, Payload, FromPID, State = #s{looking_for = Patterns}) ->
+-spec rand_hex() -> hex().
-    SP = i_sp(Recipient, Amount, Payload),
+rand_hex() ->
-    case i_lookup(SP, State) of
+    unicode:characters_to_binary(hexify(rand:bytes(10))).
-        not_found ->
-            NewPattern  = {SP, FromPID},
-            NewPatterns = [NewPattern | Patterns],
-            NewState    = State#s{looking_for = NewPatterns},
-            {ok, NewState};
-        {found, _} ->
-            {error, already_registered}
-    end.
 
-%% future proofing
+hexify(<<B:8, Rest/binary>>) when B < 16#10 -> ["0", integer_to_list(B, 16), hexify(Rest)];
-i_sp(Recipient, Amount, Payload) ->
+hexify(<<B:8, Rest/binary>>)                -> [integer_to_list(B, 16), hexify(Rest)];
-    {sp, Recipient, Amount, Payload}.
+hexify(<<>>)                                -> [].
+
+dd_url(HexStr) ->
+    unicode:characters_to_list(["grids://", fewd:host(), "/1/d/", HexStr]).
 
 
--spec i_lookup(SearchPattern, State) -> Result
+% ref
-    when SearchPattern :: sp(),
+form_txstr(_NetId, _Recipient, _Amount, _Payload) ->
-         State         :: state(),
+    "foobar".
-         Result        :: {found, NotifyPID :: pid()}
-                        | not_found.
-
-% @private look up search pattern and see if we're looking for it
-
-i_lookup(SearchPattern, State) ->
-    #s{looking_for = Patterns} = State,
-    case lists:keyfind(SearchPattern, 1, Patterns) of
-        false       -> not_found;
-        {_, Notify} -> {found, Notify}
-    end.

src/fd_httpd_client.erl

@@ -238,7 +238,7 @@ route(Sock, get, Route, Request, Received) ->
     end;
 route(Sock, post, Route, Request, Received) ->
     case Route of
-         <<"/grids-spend">> -> grids_spend(Sock, Request) , Received;
+         <<"/grids-mkdd">> -> grids_mkdd(Sock, Request) , Received;
          <<"/wfcin">>      -> wfcin(Sock, Request) , Received;
          _                 -> fd_httpd_utils:http_err(Sock, 404)  , Received
     end;
@@ -324,14 +324,14 @@ ws_echo_loop(Sock, Frames, Received) ->
 %% grids
 %% ------------------------------
 
-grids_spend(Sock, #request{enctype = json,
+grids_mkdd(Sock, #request{enctype = json,
                           body = B = #{"network_id" := NetId,
                                        "recipient"  := Recipient,
                                        "amount"     := Amount,
                                        "payload"    := Payload}}) ->
-    tell("grids_spend good request: ~tp", [B]),
+    tell("grids_mkdd good request: ~tp", [B]),
     RespObj =
-        case fd_gridsd:mk_spend(NetId, Recipient, Amount, unicode:characters_to_binary(Payload)) of
+        case fd_gridsd:mkdd(NetId, Recipient, Amount, unicode:characters_to_binary(Payload)) of
             {ok, URL, PNG} ->
                 #{"ok"         => true,
                   "result"     => #{"url"        => URL,
@@ -345,8 +345,8 @@ grids_spend(Sock, #request{enctype = json,
     Response = #response{headers = [{"content-type", "application/json"}],
                          body    = Body},
     fd_httpd_utils:respond(Sock, Response);
-grids_spend(Sock, Request) ->
+grids_mkdd(Sock, Request) ->
-    tell("grids_spend: bad request: ~tp", [Request]),
+    tell("grids_mkdd: bad request: ~tp", [Request]),
     fd_httpd_utils:http_err(Sock, 400).
 
 

src/fd_hz.erl

@@ -0,0 +1,84 @@
+% @doc hz helper functions
+-module(fd_hz).
+
+-export_type([
+]).
+
+-export([
+    txs_current/0,
+    txs_since_height/1,
+    txs_minus/1,
+    txs_from_to/2,
+    current_height/0,
+    txs_of_height/1,
+    mhs_of_height/1,
+    txs_of_mh/1,
+    filter_spends/1,
+    filter_spend/1,
+    spend_info/1,
+    test/0
+]).
+
+
+-spec test() -> no_return().
+
+test() ->
+    io:format("~tp~n", [hz:gen_current()]),
+    io:format("~tp~n", [hz:kb_current()]),
+    ok.
+
+
+
+txs_current() ->
+    H = current_height(),
+    txs_of_height(H).
+
+
+txs_since_height(H) ->
+    txs_from_to(H, current_height()).
+
+
+txs_minus(N) ->
+    H = current_height(),
+    L = H - N,
+    txs_from_to(L, H).
+
+
+txs_from_to(Min, Max) when Min =< Max ->
+    lists:append([txs_of_height(H) || H <- lists:seq(Min, Max)]);
+txs_from_to(Min, Max) when Min > Max ->
+    [].
+
+
+current_height() ->
+    {ok, H} = hz:kb_current_height(),
+    H.
+
+
+txs_of_height(Height) ->
+    lists:append([txs_of_mh(MH) || MH <- mhs_of_height(Height)]).
+
+
+-spec mhs_of_height(Height :: pos_integer()) -> term().
+mhs_of_height(Height) ->
+    {ok, #{"micro_blocks" := MHs}} = hz:gen_by_height(Height),
+    MHs.
+
+
+txs_of_mh(MH) ->
+    {ok, TXs} = hz:mb_txs(MH),
+    TXs.
+
+
+filter_spends(TXs) ->
+    lists:filtermap(fun filter_spend/1, TXs).
+
+filter_spend(#{"tx" := TX = #{"type" := "SpendTx"}}) -> {true, spend_info(TX)};
+filter_spend(_)                                      -> false.
+
+
+spend_info(#{"type" := "SpendTx",
+             "recipient_id" := Recipient,
+             "amount" := Amount,
+             "payload" := Payload}) ->
+    {sp, Recipient, Amount, Payload}.

src/fd_spy.erl

@@ -0,0 +1,213 @@
+% @doc spy: knows constraints {recipient, amount, payload}
+%
+% spies the chain for transactions that satisfy that constraint
+%
+-module(fd_spy).
+-vsn("0.2.0").
+
+% MVP: register search patterns
+% simply print to console when one of them is found
+
+-behavior(gen_server).
+
+-export_type([
+]).
+
+-export([
+    %% caller context
+    reg/3,
+
+    %% api
+    start_link/0,
+
+    %% process context
+    init/1, handle_call/3, handle_cast/2, handle_info/2,
+    code_change/3, terminate/2
+]).
+
+% recipient is a string
+-type pubkey32() :: <<_:256>>.
+
+-record(sp,
+        {recipient  :: pubkey32(),
+         amount     :: pos_integer(),
+         payload    :: binary()}).
+-type search_pattern() :: #sp{}.
+
+-record(s,
+        {last_height_seen = none :: none | integer(),
+         searching_for    = []   :: [search_pattern()]}).
+
+-type state() :: #s{}.
+
+-include("$zx_include/zx_logger.hrl").
+
+%%-----------------------------------------------------------------------------
+%% caller context
+%%-----------------------------------------------------------------------------
+
+-spec reg(Recipient, Amount, Payload) -> ok | {error, Reason}
+    when Recipient :: pubkey32(),
+         Amount    :: pos_integer(),
+         Payload   :: binary(),
+         Reason    :: any().
+
+reg(R, A, P) when is_binary(R), byte_size(R) =:= 32,
+                  is_integer(A), A >= 0,
+                  is_binary(P) ->
+    gen_server:call(?MODULE, {reg, R, A, P}).
+
+
+
+%% gen_server callbacks
+start_link() ->
+    gen_server:start_link({local, ?MODULE}, ?MODULE, none, []).
+
+
+%%-----------------------------------------------------------------------------
+%% process context below this line
+%%-----------------------------------------------------------------------------
+
+%% gen_server callbacks
+
+-spec init(none) -> {ok, state()}.
+
+init(none) ->
+    tell("starting fd_spy"),
+    hz:chain_nodes(fewd:chain_nodes()),
+    erlang:send_after(1000, self(), check_chain),
+    InitState = #s{},
+    {ok, InitState}.
+
+
+
+-spec handle_call(Msg, From, State) -> Result
+    when Msg      :: any(),
+         From     :: {pid(), reference()},
+         State    :: state(),
+         Result   :: {reply, Reply, NewState}
+                   | {noreply, NewState},
+         Reply    :: any(),
+         NewState :: state().
+
+handle_call({reg, Recipient, Amount, Payload}, _From, State) ->
+    {Reply, NewState} = do_reg(Recipient, Amount, Payload, State),
+    {reply, Reply, NewState};
+handle_call(Unexpected, From, State) ->
+    tell("~tp: unexpected call from ~tp: ~tp", [?MODULE, Unexpected, From]),
+    {noreply, State}.
+
+
+
+handle_cast(Unexpected, State) ->
+    tell("~tp: unexpected cast: ~tp", [?MODULE, Unexpected]),
+    {noreply, State}.
+
+
+
+handle_info(check_chain, State) ->
+    NewState = do_check_chain(State),
+    erlang:send_after(1000, self(), check_chain),
+    {noreply, NewState};
+handle_info(Unexpected, State) ->
+    tell("~tp: unexpected info: ~tp", [?MODULE, Unexpected]),
+    {noreply, State}.
+
+
+
+code_change(_, State, _) ->
+    {ok, State}.
+
+
+
+terminate(_, _) ->
+    ok.
+
+
+
+%%-----------------------------------------------------------------------------
+%% internals
+%%-----------------------------------------------------------------------------
+
+do_check_chain(State = #s{last_height_seen = none}) ->
+    case hz:kb_current_height() of
+        {ok, Max} ->
+            hh(Max-1, Max, State);
+        Error     ->
+            tell("~tp hz error: ~tp", [?MODULE, Error]),
+            State
+    end;
+do_check_chain(State = #s{last_height_seen = Min}) ->
+    case hz:kb_current_height() of
+        {ok, Max} ->
+            hh(Min, Max, State);
+        Error     ->
+            tell("~tp hz error: ~tp", [?MODULE, Error]),
+            State
+    end.
+
+% handle height
+hh(PrevHeight, NewHeight, State) when PrevHeight < NewHeight ->
+    tell("~tp cool: PrevHeight=~tp, NewHeight=~tp", [?MODULE, PrevHeight, NewHeight]),
+    Spends = fd_hz:filter_spends(fd_hz:txs_from_to(PrevHeight + 1, NewHeight)),
+    tell("~tp spends: ~tp", [?MODULE, Spends]),
+    NewState = State#s{last_height_seen = NewHeight},
+    NewState;
+hh(PrevHeight, NewHeight, State) when PrevHeight >= NewHeight ->
+    log(info, "~tp lame: PrevHeight=~tp, NewHeight=~tp", [?MODULE, PrevHeight, NewHeight]),
+    State.
+
+
+-spec do_reg(Recipient, Amount, Payload, State) -> {Reply, NewState}
+    when Recipient :: pubkey32(),
+         Amount    :: pos_integer(),
+         Payload   :: binary(),
+         State     :: state(),
+         Reply     :: ok
+                    | {error, Reason},
+         Reason    :: any(),
+         NewState  :: state().
+
+do_reg(Recipient, Amount, Payload, State) ->
+    case already_registered(Recipient, Payload, State) of
+        true  -> {error, already_registered};
+        false -> really_register(Recipient, Amount, Payload, State)
+    end.
+
+
+
+-spec already_registered(Recipient, Payload, State) -> boolean()
+    when Recipient :: pubkey32(),
+         Payload   :: binary(),
+         State     :: state().
+
+already_registered(Recipient, Payload, _State = #s{searching_for = SPs}) ->
+    ar(Recipient, Payload, SPs).
+
+ar(Recipient, Payload, [#sp{recipient=Recipient, payload=Payload} | _]) ->
+    true;
+ar(Recipient, Payload, [_ | Rest]) ->
+    ar(Recipient, Payload, Rest);
+ar(_, _, []) ->
+    false.
+
+
+
+-spec really_register(Recipient, Amount, Payload, State) -> {Reply, NewState}
+    when Recipient :: pubkey32(),
+         Amount    :: pos_integer(),
+         Payload   :: binary(),
+         State     :: state(),
+         Reply     :: ok
+                    | {error, Reason},
+         Reason    :: any(),
+         NewState  :: state().
+
+really_register(R, A, P, State = #s{searching_for = SPs}) ->
+    NewSearchPattern = #sp{recipient = R,
+                           amount    = A,
+                           payload   = P},
+    tell("~tp: really_register(~tp,~tp,~tp)", [?MODULE, R, A, P]),
+    NewSearchPatterns = [NewSearchPattern | SPs],
+    NewState = State#s{searching_for = NewSearchPatterns},
+    {reply, ok, NewState}.

src/fd_sup.erl

@@ -36,6 +36,12 @@ start_link() ->
 
 init([]) ->
     RestartStrategy = {one_for_one, 1, 60},
+    Spy       = {fd_spy,
+                 {fd_spy, start_link, []},
+                 permanent,
+                 5000,
+                 worker,
+                 [fd_spy]},
     GridsD    = {fd_gridsd,
                  {fd_gridsd, start_link, []},
                  permanent,
@@ -54,5 +60,5 @@ init([]) ->
                  5000,
                  supervisor,
                  [fd_httpd]},
-    Children  = [GridsD, WFCd, Httpd],
+    Children  = [Spy, GridsD, WFCd, Httpd],
     {ok, {RestartStrategy, Children}}.

src/fewd.erl

@@ -9,13 +9,21 @@
 -copyright("Peter Harpending <peterharpending@qpq.swiss>").
 -license("BSD-2-Clause-FreeBSD").
 
--export([network_id/0, pubkey/0, akstr/0]).
+-export([chain_nodes/0, url/0, host/0, network_id/0, pubkey/0, akstr/0]).
 -export([listen/1, ignore/0]).
 -export([start/2, stop/1]).
 
 -include("$zx_include/zx_logger.hrl").
 
 
+%% for testing: use mainnet
+%chain_nodes() ->
+%    [{"tsuriai.jp", 3013}].
+chain_nodes() ->
+    [{"tsuriai.jp", 4013}].
+
+url()        -> "http://" ++ host().
+host()       -> "localhost:8000".
 network_id() -> "groot.testnet".
 pubkey()     -> pad32(<<"fewd demo">>).
 akstr()      -> gmgrids:akstr(pubkey()).

zomp.meta

@@ -5,12 +5,18 @@
 {prefix,"fd"}.
 {desc,"Front End Web Dev in Erlang stuff"}.
 {package_id,{"otpr","fewd",{0,2,0}}}.
-{deps,[{"otpr","hakuzaru",{0,7,0}},
+{deps,[{"otpr","hakuzaru",{0,8,3}},
-       {"otpr","qr",{0,1,0}},
+            {"otpr","sophia",{9,0,0}},
             {"otpr","gmserialization",{0,1,3}},
                 {"otpr","eblake2",{1,0,1}},
                 {"otpr","base58",{0,1,1}},
-       {"otpr","zj",{1,1,2}}]}.
+            {"otpr","gmbytecode",{3,4,1}},
+            {"otpr","base58",{0,1,1}},
+            {"otpr","eblake2",{1,0,1}},
+            {"otpr","ec_utils",{1,0,0}},
+            {"otpr","zj",{1,1,2}},
+            {"otpr","getopt",{1,0,2}},
+       {"otpr","qr",{0,1,0}}]}.
 {key_name,none}.
 {a_email,"peterharpending@qpq.swiss"}.
 {c_email,"peterharpending@qpq.swiss"}.