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

wip
grids random payload defined
2026-03-02 18:54:33 -08:00 · 2026-03-02 18:27:05 -08:00 · 2026-02-27 11:43:33 -08:00 · 2026-02-27 11:34:33 -08:00 · 2026-02-25 18:22:26 -08:00 · 2025-12-30 11:45:25 -08:00
18 changed files with 816 additions and 53 deletions
@@ -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
@@ -1,9 +1,43 @@
-# fewd = front end web dev
+fewd = front end web dev
+=====================================================================

 this is me (PRH) trying to learn some front end web dev because pixels are
 important despite my wishes.

-# notes
+Building/Running
+---------------------------------------------------------------------

-## goal queue
+### Prereqs

+1. [Install Erlang and ZX](https://git.qpq.swiss/QPQ-AG/research-megadoc/wiki/Installing-Erlang-and-zx)
+2. **DEV ONLY**: `apt install node-typescript` (Devuan Excalibur)
+
+   This is needed if you want to **edit** the `.ts` files found in
+   `/priv/static/js/ts/*.ts`. The built JS files are under version control and can
+   be found in `/priv/static/js/dist/`
+
+### Building/Running HTTP Server
+
+If you are only changing the Erlang or simply just want to run the program
+without developing it, then just run
+
+```
+zxh runlocal
+```
+
+### Building TS->JS
+
+**This is only necessary if you edited the `.ts` files and want to transpile
+them over to JS.**
+
+This requires you installed `tsc` as above.
+
+```
+make tsc
+```
+
+If you're doing development you may want
+
+```
+make watch
+```
@@ -0,0 +1,20 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="utf-8">
+    <title>FIXME</title>
+    <link rel="stylesheet" href="/css/default.css">
+</head>
+<body>
+    <div id="titlebar">
+        <div class="content">
+            <a href="/" class="tb-home">Home</a>
+        </div>
+    </div>
+
+    <div class="content">
+        <h1 class="content-title">FEWD: FIXME</h1>
+
+    </div>
+</body>
+</html>
@@ -0,0 +1,9 @@
+/**
+ * Title:           Title
+ * Description:     Description
+ * Author:          Peter Harpending <peterharpending@qpq.swiss>
+ * Date:            YYYY-MM-DD
+ * Last-Updated:    YYYY-MM-DD
+ *
+ * @module
+ */
@@ -0,0 +1,60 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="utf-8">
+    <title>Basic GRIDS Demo</title>
+    <link rel="stylesheet" href="/css/default.css">
+</head>
+<body>
+    <div id="titlebar">
+        <div class="content">
+            <a href="/" class="tb-home">Home</a>
+        </div>
+    </div>
+
+    <div class="content">
+        <h1 class="content-title">FEWD: GRIDS DEMO</h1>
+
+
+        <h2>Making a Spend</h2>
+
+        <label for="grids-n">Network ID:</label>
+        <input type  = "text"
+               id    = "grids-n"
+               value = "groot.testnet"
+               disabled>
+        <br>
+
+        <label for="grids-r">Recipient:</label>
+        <input type  = "text"
+               id    = "grids-r"
+               value = "ak_n6aVQ6PkBdVdv7kRRcfnzDVmBsH6hqEwVWSB6UAEb3kkjrPMe"
+               disabled>
+        <br>
+
+        <label for="grids-a">Amount (P):</label>
+        <input type  = "number"
+               id    = "grids-a"
+               value = "69"
+               disabled>
+        <br>
+
+        <label for="grids-p">Payload:</label>
+        <input type  = "text"
+               id    = "grids-p"
+               disabled>
+        <br>
+
+        <input type  = "button"
+               id    = "grids-submit"
+               value = "Generate">
+        <br>
+
+        <textarea disabled id="grids-url" hidden></textarea>
+        <br>
+        <img id="grids-png" hidden>
+    </div>
+
+    <script src="/js/dist/grids-basic.js"></script>
+</body>
+</html>
@@ -17,6 +17,7 @@

        <ul>
            <li><a href="/echo.html">Echo</a></li>
+            <li><a href="/grids-basic.html">GRIDS: Basic Demo</a></li>
            <li><a href="/wfc.html">WFC</a></li>
        </ul>
    </div>
@@ -0,0 +1,29 @@
+/**
+ * Title:           GRIDS Basic Page Script
+ * Description:     Page Script for /grids-basic.html
+ * Author:          Peter Harpending <peterharpending@qpq.swiss>
+ * Date:            2025-12-29
+ * Last-Updated:    2025-12-29
+ *
+ * @module
+ */
+/**
+ * Runs on page load
+ */
+declare function main(): Promise<void>;
+declare function on_submit(n_input: HTMLInputElement, r_input: HTMLInputElement, a_input: HTMLInputElement, p_input: HTMLInputElement, grids_url_elt: HTMLTextAreaElement, grids_png_elt: HTMLImageElement): Promise<void>;
+type Safe<t> = {
+    ok: true;
+    result: t;
+} | {
+    ok: false;
+    error: string;
+};
+type GridsResult = {
+    url: string;
+    png_base64: string;
+};
+/**
+ * gets the grids url
+ */
+declare function grids_request(net_id: string, recipient: string, amount: number, payload: string): Promise<Safe<GridsResult>>;
@@ -0,0 +1,87 @@
+"use strict";
+/**
+ * Title:           GRIDS Basic Page Script
+ * Description:     Page Script for /grids-basic.html
+ * Author:          Peter Harpending <peterharpending@qpq.swiss>
+ * Date:            2025-12-29
+ * Last-Updated:    2025-12-29
+ *
+ * @module
+ */
+main();
+/**
+ * Runs on page load
+ */
+async function main() {
+    let n_input = document.getElementById('grids-n');
+    let r_input = document.getElementById('grids-r');
+    let a_input = document.getElementById('grids-a');
+    let p_input = document.getElementById('grids-p');
+    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);
+    });
+    // enable buttons
+    submit_btn.disabled = false;
+}
+async function on_submit(n_input, r_input, a_input, p_input, grids_url_elt, grids_png_elt) {
+    // pull out values
+    let network_id = n_input.value;
+    let recipient = r_input.value;
+    let amount = parseInt(a_input.value);
+    let payload = p_input.value;
+    let result = await grids_request(network_id, recipient, amount, payload);
+    // show url field and png
+    if (result.ok) {
+        let url = result.result.url;
+        let png_base64 = result.result.png_base64;
+        let src_prefix = 'data:image/png;base64,';
+        let src = src_prefix + png_base64;
+        grids_url_elt.innerText = url;
+        grids_png_elt.src = src;
+        grids_url_elt.hidden = false;
+        grids_png_elt.hidden = false;
+    }
+    else {
+        alert('ERROR: ' + result.error);
+    }
+}
+/**
+ * gets the grids url
+ */
+async function grids_request(net_id, recipient, amount, payload) {
+    // format for network transmission
+    let obj = { 'network_id': net_id,
+        'recipient': recipient,
+        'amount': amount,
+        'payload': payload };
+    let obj_text = JSON.stringify(obj, undefined, 4);
+    let url = '/grids-mkdd';
+    let req_options = { method: 'POST',
+        headers: { 'content-type': 'application/json' },
+        body: obj_text };
+    let result = { ok: false,
+        error: 'IT DO BE LIKE THAT MISTA STANCIL' };
+    try {
+        let response = await fetch(url, req_options);
+        if (response.ok)
+            result = await response.json();
+        else {
+            console.log('bad http response:', response);
+            result = { ok: false, error: 'BAD HTTP RESPONSE' };
+        }
+    }
+    catch (x) {
+        console.log('network error:', x);
+        result = { ok: false, error: 'NETWORK ERROR' };
+    }
+    return result;
+}
+//# sourceMappingURL=grids-basic.js.map
@@ -0,0 +1 @@
+{"version":3,"file":"grids-basic.js","sourceRoot":"","sources":["../ts/grids-basic.ts"],"names":[],"mappings":";AAAA;;;;;;;;GAQG;AAEH,IAAI,EAAE,CAAC;AAGP;;GAEG;AACH,KAAK,UACL,IAAI;IAGA,IAAI,OAAO,GAAM,QAAQ,CAAC,cAAc,CAAC,SAAS,CAA0B,CAAC;IAC7E,IAAI,OAAO,GAAM,QAAQ,CAAC,cAAc,CAAC,SAAS,CAA0B,CAAC;IAC7E,IAAI,OAAO,GAAM,QAAQ,CAAC,cAAc,CAAC,SAAS,CAA0B,CAAC;IAC7E,IAAI,OAAO,GAAM,QAAQ,CAAC,cAAc,CAAC,SAAS,CAA0B,CAAC;IAC7E,IAAI,UAAU,GAAG,QAAQ,CAAC,cAAc,CAAC,cAAc,CAAqB,CAAC;IAE7E,IAAI,aAAa,GAAG,QAAQ,CAAC,cAAc,CAAC,WAAW,CAAwB,CAAC;IAChF,IAAI,aAAa,GAAG,QAAQ,CAAC,cAAc,CAAC,WAAW,CAAqB,CAAC;IAE7E,IAAI,SAAS,GAAgB,IAAI,UAAU,CAAC,EAAE,CAAC,CAAC;IAChD,MAAM,CAAC,MAAM,CAAC,eAAe,CAAC,SAAS,CAAC,CAAC;IACzC,IAAI,GAAG,GAAY,SAAS,CAAC,KAAK,EAAE,CAAC,WAAW,EAAE,CAAC;IACnD,OAAO,CAAC,KAAK,GAAG,eAAe,GAAG,GAAG,CAAC;IAEtC,sBAAsB;IACtB,UAAU,CAAC,gBAAgB,CACvB,OAAO,EACP,KAAK,WAAU,CAAC;QACZ,MAAM,SAAS,CAAC,OAAO,EAAE,OAAO,EAAE,OAAO,EAAE,OAAO,EAAE,aAAa,EAAE,aAAa,CAAC,CAAA;IACrF,CAAC,CACJ,CAAC;IAEF,iBAAiB;IACjB,UAAU,CAAC,QAAQ,GAAG,KAAK,CAAC;AAChC,CAAC;AAED,KAAK,UACL,SAAS,CACJ,OAAgC,EAChC,OAAgC,EAChC,OAAgC,EAChC,OAAgC,EAChC,aAAmC,EACnC,aAAgC;IAGjC,kBAAkB;IAClB,IAAI,UAAU,GAAY,OAAO,CAAC,KAAK,CAAC;IACxC,IAAI,SAAS,GAAa,OAAO,CAAC,KAAK,CAAC;IACxC,IAAI,MAAM,GAAgB,QAAQ,CAAC,OAAO,CAAC,KAAK,CAAC,CAAC;IAClD,IAAI,OAAO,GAAe,OAAO,CAAC,KAAK,CAAC;IAExC,IAAI,MAAM,GAAsB,MAAM,aAAa,CAAC,UAAU,EAAE,SAAS,EAAE,MAAM,EAAE,OAAO,CAAC,CAAC;IAE5F,yBAAyB;IACzB,IAAI,MAAM,CAAC,EAAE,EAAE,CAAC;QACZ,IAAI,GAAG,GAAmB,MAAM,CAAC,MAAM,CAAC,GAAG,CAAC;QAC5C,IAAI,UAAU,GAAY,MAAM,CAAC,MAAM,CAAC,UAAU,CAAC;QAEnD,IAAI,UAAU,GAAY,wBAAwB,CAAA;QAElD,IAAI,GAAG,GAAG,UAAU,GAAG,UAAU,CAAC;QAElC,aAAa,CAAC,SAAS,GAAG,GAAG,CAAC;QAC9B,aAAa,CAAC,GAAG,GAAS,GAAG,CAAC;QAE9B,aAAa,CAAC,MAAM,GAAG,KAAK,CAAC;QAC7B,aAAa,CAAC,MAAM,GAAG,KAAK,CAAC;IACjC,CAAC;SACI,CAAC;QACF,KAAK,CAAC,SAAS,GAAG,MAAM,CAAC,KAAK,CAAC,CAAC;IACpC,CAAC;AACL,CAAC;AASD;;GAEG;AACH,KAAK,UACL,aAAa,CACR,MAAkB,EAClB,SAAkB,EAClB,MAAkB,EAClB,OAAkB;IAGnB,kCAAkC;IAClC,IAAI,GAAG,GAAiB,EAAC,YAAY,EAAG,MAAM;QACrB,WAAW,EAAI,SAAS;QACxB,QAAQ,EAAO,MAAM;QACrB,SAAS,EAAM,OAAO,EAAC,CAAC;IACjD,IAAI,QAAQ,GAAY,IAAI,CAAC,SAAS,CAAC,GAAG,EAAE,SAAS,EAAE,CAAC,CAAC,CAAC;IAG1D,IAAI,GAAG,GAAG,aAAa,CAAC;IACxB,IAAI,WAAW,GAAI,EAAC,MAAM,EAAG,MAAM;QACf,OAAO,EAAE,EAAC,cAAc,EAAE,kBAAkB,EAAC;QAC7C,IAAI,EAAK,QAAQ,EAAC,CAAC;IAGvC,IAAI,MAAM,GACF,EAAC,EAAE,EAAM,KAAK;QACb,KAAK,EAAG,kCAAkC,EAAC,CAAC;IAErD,IAAI,CAAC;QACD,IAAI,QAAQ,GAAc,MAAM,KAAK,CAAC,GAAG,EAAE,WAAW,CAAC,CAAC;QACxD,IAAI,QAAQ,CAAC,EAAE;YACX,MAAM,GAAG,MAAM,QAAQ,CAAC,IAAI,EAAuB,CAAC;aACnD,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"}
@@ -0,0 +1,136 @@
+/**
+ * Title:           GRIDS Basic Page Script
+ * Description:     Page Script for /grids-basic.html
+ * Author:          Peter Harpending <peterharpending@qpq.swiss>
+ * Date:            2025-12-29
+ * Last-Updated:    2025-12-29
+ *
+ * @module
+ */
+
+main();
+
+
+/**
+ * Runs on page load
+ */
+async function
+main
+    ()
+{
+    let n_input    = document.getElementById('grids-n')      as HTMLInputElement;
+    let r_input    = document.getElementById('grids-r')      as HTMLInputElement;
+    let a_input    = document.getElementById('grids-a')      as HTMLInputElement;
+    let p_input    = document.getElementById('grids-p')      as HTMLInputElement;
+    let submit_btn = document.getElementById('grids-submit') as HTMLInputElement;
+
+    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',
+        async function(e) {
+            await on_submit(n_input, r_input, a_input, p_input, grids_url_elt, grids_png_elt)
+        }
+    );
+
+    // enable buttons
+    submit_btn.disabled = false;
+}
+
+async function
+on_submit
+    (n_input       : HTMLInputElement,
+     r_input       : HTMLInputElement,
+     a_input       : HTMLInputElement,
+     p_input       : HTMLInputElement,
+     grids_url_elt : HTMLTextAreaElement,
+     grids_png_elt : HTMLImageElement)
+    : Promise<void>
+{
+    // pull out values
+    let network_id : string = n_input.value;
+    let recipient  : string = r_input.value;
+    let amount     : number = parseInt(a_input.value);
+    let payload    : string = p_input.value;
+
+    let result: Safe<GridsResult> = await grids_request(network_id, recipient, amount, payload);
+
+    // show url field and png
+    if (result.ok) {
+        let url        : string = result.result.url;
+        let png_base64 : string = result.result.png_base64;
+
+        let src_prefix : string = 'data:image/png;base64,'
+
+        let src = src_prefix + png_base64;
+
+        grids_url_elt.innerText = url;
+        grids_png_elt.src       = src;
+
+        grids_url_elt.hidden = false;
+        grids_png_elt.hidden = false;
+    }
+    else {
+        alert('ERROR: ' + result.error);
+    }
+}
+
+
+type Safe<t> = {ok: true,  result: t}
+             | {ok: false, error: string};
+
+type GridsResult = {url       : string,
+                    png_base64: string};
+
+/**
+ * gets the grids url
+ */
+async function
+grids_request
+    (net_id    : string,
+     recipient : string,
+     amount    : number,
+     payload   : string)
+    : Promise<Safe<GridsResult>>
+{
+    // format for network transmission
+    let obj      : object = {'network_id' : net_id,
+                             'recipient'  : recipient,
+                             'amount'     : amount,
+                             'payload'    : payload};
+    let obj_text : string = JSON.stringify(obj, undefined, 4);
+
+
+    let url = '/grids-mkdd';
+    let req_options  = {method:  'POST',
+                        headers: {'content-type': 'application/json'},
+                        body:    obj_text};
+
+
+    let result: Safe<GridsResult> =
+            {ok    : false,
+             error : 'IT DO BE LIKE THAT MISTA STANCIL'};
+
+    try {
+        let response : Response = await fetch(url, req_options);
+        if (response.ok)
+            result = await response.json() as Safe<GridsResult>;
+        else {
+            console.log('bad http response:', response);
+            result = {ok: false, error: 'BAD HTTP RESPONSE'};
+        }
+    }
+    catch (x: any) {
+        console.log('network error:', x);
+        result = {ok: false, error: 'NETWORK ERROR'};
+    }
+
+    return result;
+}
@@ -9,7 +9,7 @@

 -export([
    %% caller context
-    get_url/2,
+    mkdd/4,

    %% api
    start_link/0,
@@ -21,22 +21,19 @@

 -include("$zx_include/zx_logger.hrl").

-type mh_str()         :: string().
+-type hex() :: binary().
+-define(SEC, 1).
+-define(MIN, 60*SEC).
+-define(DEAD_DROP_TTL, 30*MIN).

-%% for craig's autism
-record(sp,
-        {recipient :: string(),
-         amount    :: non_neg_integer(),
-         payload   :: binary()}).
-
-type search_pattern() :: #sp{}.
+-record(dd,
+        {created_at :: integer(),
+         payload    :: string()}).
+-type dd()  :: #dd{}.

 -record(s,
-        {current_gen_height         :: pos_integer(),
-         current_gen_hash           :: string(),
-         current_gen_seen_mb_hashes :: [mh_str()],
-         past_gen_seen_mb_hashes    :: [mh_str()],
-         looking_for                :: [search_pattern()]}).
+        {drops = #{} :: #{hex() := dd()}}).
+
 -type state() :: #s{}.


@@ -44,14 +41,20 @@
 %% caller context
 %%-----------------------------------------------------------------------------

-spec get_url(Amount, Payload) -> {ok, URL, QR_PNG} | {error, term()}
-    when Amount  :: none | pos_integer(),
-         Payload :: none | binary(),
-         URL     :: string(),
-         QR_PNG  :: binary().
+-spec mkdd(NetworkId, Recipient, Amount, Payload) -> Result
+    when NetworkId :: string(),
+         Recipient :: string(),
+         Amount    :: non_neg_integer(),
+         Payload   :: binary(),
+         Result    :: {ok, URL, QR_PNG}
+                    | {error, string()},
+         URL       :: string(),
+         QR_PNG    :: binary().
+% @doc
+% make a dead drop

-get_url(Amount, Payload) ->
-    gen_server:call(?MODULE, {get_url, Amount, Payload}).
+mkdd(NetworkId, Recipient, Amount, Payload) ->
+    gen_server:call(?MODULE, {mkdd, NetworkId, Recipient, Amount, Payload}).


 %% gen_server callbacks
@@ -71,12 +74,10 @@ init(none) ->
    {ok, InitState}.


-handle_call({get_url, Amount, Payload}, From, State) ->
-    case i_get_url(Amount, Payload, From, State) of
-        {ok, URL, PNG, NewState} ->
-            {reply, {ok, URL, PNG}, NewState};
-        Error ->
-            {reply, Error, State}
+handle_call({mkdd, NetworkId, Recipient, Amount, Payload}, From, State) ->
+    case do_mkdd(NetworkId, Recipient, Amount, Payload, State) of
+        {ok, URL, PNG, NewState} -> {reply, {ok, URL, PNG}, NewState};
+        Error                    -> {reply, Error, State}
    end;
 handle_call(Unexpected, From, State) ->
    tell("~tp: unexpected call from ~tp: ~tp", [?MODULE, Unexpected, From]),
@@ -104,19 +105,46 @@ terminate(_, _) ->
 %% internals
 %%-----------------------------------------------------------------------------

-spec i_get_url(Amount, Payload, From, State) -> Result
-    when Amount  :: none | pos_integer(),
-         Payload :: none | binary(),
-         From    :: {pid(), reference()},
-         State   :: state(),
-         URL     :: string(),
-         QR_PNG  :: binary().
-         Result  :: {ok, URL, QR_PNG, NewState}
-                  | {error, term()}.
+-spec do_mkdd(NetworkId, Recipient, Amount, Payload, State) -> Result
+    when NetworkId :: string(),
+         Recipient :: string(),
+         Amount    :: pos_integer(),
+         Payload   :: binary(),
+         State     :: state(),
+         Result    :: {ok, URL, QR_PNG, NewState}
+                    | {error, Reason},
+         URL      :: string(),
+         QR_PNG   :: binary(),
+         NewState :: state(),
+         Reason   :: any().

-i_get_url(Amount, Payload, From, State) ->
-    NetworkId = fewd:network_id(),
-    Pubkey    = fewd:pubkey(),
-    URL       = gmgrids:encode({spend, NetworkId, Pubkey},
-                               [{amount, Amount}, {payload, Payload}]),
-    
+do_mkdd(NetId, Recipient, Amount, Payload, State = #s{drops = Drops}) ->
+    HexStr    = rand_hex(),
+    CreatedAt = now_sec(),
+    TxStr     = form_txstr(NetId, Recipient, Amount, Payload),
+    DD        = #dd{created_at = CreatedAt, payload = TxStr},
+    URL       = dd_url(HexStr),
+    PNG       = qr:encode_png(unicode:characters_to_binary(URL)),
+    NewDrops  = maps:put(HexStr, DD, Drops),
+    NewState  = State#s{drops = NewDrops},
+    {ok, URL, PNG, NewState}.
+
+now_sec() ->
+    calendar:datetime_to_gregorian_seconds(calendar:universal_time()).
+
+
+-spec rand_hex() -> hex().
+rand_hex() ->
+    unicode:characters_to_binary(hexify(rand:bytes(10))).
+
+hexify(<<B:8, Rest/binary>>) when B < 16#10 -> ["0", integer_to_list(B, 16), hexify(Rest)];
+hexify(<<B:8, Rest/binary>>)                -> [integer_to_list(B, 16), hexify(Rest)];
+hexify(<<>>)                                -> [].
+
+dd_url(HexStr) ->
+    unicode:characters_to_list(["grids://", fewd:host(), "/1/d/", HexStr]).
+
+
+% ref
+form_txstr(_NetId, _Recipient, _Amount, _Payload) ->
+    "foobar".
@@ -238,8 +238,9 @@ route(Sock, get, Route, Request, Received) ->
    end;
 route(Sock, post, Route, Request, Received) ->
    case Route of
-         <<"/wfcin">>       -> wfcin(Sock, Request) , Received;
-         _                  -> fd_httpd_utils:http_err(Sock, 404)  , Received
+         <<"/grids-mkdd">> -> grids_mkdd(Sock, Request) , Received;
+         <<"/wfcin">>      -> wfcin(Sock, Request) , Received;
+         _                 -> fd_httpd_utils:http_err(Sock, 404)  , Received
    end;
 route(Sock, _, _, _, Received) ->
    fd_httpd_utils:http_err(Sock, 404),
@@ -319,6 +320,36 @@ ws_echo_loop(Sock, Frames, Received) ->
            error(Error)
    end.

+%% ------------------------------
+%% grids
+%% ------------------------------
+
+grids_mkdd(Sock, #request{enctype = json,
+                          body = B = #{"network_id" := NetId,
+                                       "recipient"  := Recipient,
+                                       "amount"     := Amount,
+                                       "payload"    := Payload}}) ->
+    tell("grids_mkdd good request: ~tp", [B]),
+    RespObj =
+        case fd_gridsd:mkdd(NetId, Recipient, Amount, unicode:characters_to_binary(Payload)) of
+            {ok, URL, PNG} ->
+                #{"ok"         => true,
+                  "result"     => #{"url"        => URL,
+                                    "png_base64" => unicode:characters_to_list(base64:encode(PNG))}};
+            {error, String} ->
+                #{"ok"    => false,
+                  "error" => String}
+        end,
+    Body = zj:encode(RespObj),
+    % update cache with new context
+    Response = #response{headers = [{"content-type", "application/json"}],
+                         body    = Body},
+    fd_httpd_utils:respond(Sock, Response);
+grids_mkdd(Sock, Request) ->
+    tell("grids_mkdd: bad request: ~tp", [Request]),
+    fd_httpd_utils:http_err(Sock, 400).
+
+

 %% ------------------------------
 %% wfc
@@ -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}.
@@ -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}.
@@ -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}}.
@@ -9,15 +9,24 @@
 -copyright("Peter Harpending <peterharpending@qpq.swiss>").
 -license("BSD-2-Clause-FreeBSD").

-export([network_id/0, pubkey/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").
+pubkey()     -> pad32(<<"fewd demo">>).
+akstr()      -> gmgrids:akstr(pubkey()).


 pad32(Bytes) ->
@@ -5,9 +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}},
-       {"otpr","qr",{0,1,0}},
-       {"otpr","zj",{1,1,2}}]}.
+{deps,[{"otpr","hakuzaru",{0,8,3}},
+            {"otpr","sophia",{9,0,0}},
+            {"otpr","gmserialization",{0,1,3}},
+                {"otpr","eblake2",{1,0,1}},
+                {"otpr","base58",{0,1,1}},
+            {"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"}.
Author	SHA1	Message	Date
Peter Harpending	46345da283	we now spy keyblocks for spends, need to test but probably close to working	2026-03-02 18:54:33 -08:00
Peter Harpending	bc870e5f2d	wip	2026-03-02 18:27:05 -08:00
Peter Harpending	4ee1825b43	grids random payload defined 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	2026-02-27 11:43:33 -08:00
Peter Harpending	be6aceb41a	start spy process	2026-02-27 11:34:33 -08:00
pharpend	8a9f060b2d	made a little progress on grids demo i mostly have my head wrapped around the problem a lot more, and need to just let my brain sit	2026-02-25 18:22:26 -08:00
pharpend	9adbf67ebd	shed biketh	2025-12-30 11:45:25 -08:00
pharpend	ee35e6cf1f	HTML BIKESHED	2025-12-29 15:41:29 -08:00
pharpend	3343dcf137	basic grids demo seems to work...	2025-12-29 14:04:03 -08:00
pharpend	f0d1097f1f	qr demo	2025-12-29 08:49:42 -08:00
				`@@ -0,0 +1 @@`
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