WIP: handle %generate-txbu

app/btc-wallet-hook.hoon

@@ -21,6 +21,7 @@
 ++  def-moon-limit  10
 ::  provider: maybe ship if provider is set
 ::  moon-limit: how many addresses a ship and its moons can request in piym
+::  piym/poym-watch: listen to btc-wallet-store for address updates; update payment info
 ::
 +$  state-0
   $:  %0
@@ -146,7 +147,7 @@
     ?>  =(payer.act our.bowl)
     :_  state
     :~  %-  poke-wallet-store
-        [%generate-txbu u.def-wallet fee.btc-state ~[[address.act value.act]]]
+        [%generate-txbu u.def-wallet `src.bowl fee.btc-state ~[[address.act value.act]]]
     ==
     ::
       %force-retry
@@ -216,7 +217,9 @@
       %generate-txbu
       :: TODO: add the txbu to poym
       :: send all its input tx-ids out for feedback
-    `state
+    :_  ?~  payee.upd  state
+        state(poym (~(put by poym) u.payee.upd txbu.upd))
+    ~
     ::
       %scan-done
     ?~  def-wallet

app/btc-wallet-store.hoon

@@ -124,12 +124,12 @@
       %generate-txbu
     =/  uw=(unit walt)  (~(get by walts) xpub.act)
     ?~  uw  ~&(>>> "btc-wallet-store: non-existent xpub" `state)
-    =/  r=(unit [=vbytes:btc =txbu])
+    =/  r=(unit txbu)
       %~  select-utxos  sut
-      [u.uw eny.bowl +>.act]
+      [u.uw eny.bowl feyb.act txos.act]
     ?~  r  ~&(>>> "btc-wallet-store: insufficient balance" `state)
     :_  state
-    ~[(send-update [%generate-txbu xpub.act u.r])]
+    ~[(send-update [%generate-txbu xpub.act payee.act u.r])]
   ==
 ::  wallet scan algorithm:
 ::  Initiate a batch for each chyg, with max-gap idxs in it

lib/btc-wallet-store.hoon

@@ -127,24 +127,25 @@
     (sub val cost)
   ::  Uses naive random selection. Should switch to branch-and-bound later. 
   ::
-  ++  inputs-to-txbu
-    |=  is=(list input)  ^-  txbu
-    :_  txos
-    %+  turn  is
-    |=(i=input [utxo.i ~ [bipt.w chyg.i idx.i]])
-  ::
   ++  select-utxos
-    |^  ^-  (unit [=vbytes =txbu])
+    |^  ^-  (unit =txbu)
     =/  uis=(unit (list input))
       %-  single-random-draw
       %-  zing
       (turn ~(val by wach.w) to-inputs)
-    ?~  uis  ~
-    `[(total-vbytes u.uis) (inputs-to-txbu u.uis)]
+    ?~(uis ~ `(inputs-to-txbu u.uis))
+    ::
     ++  to-inputs
       |=  =addi  ^-  (list input)
       %+  turn  ~(tap in utxos.addi)
       |=(=utxo:btc [utxo chyg.addi idx.addi])
+    ++  inputs-to-txbu
+      |=  is=(list input)  ^-  txbu
+      :*  (total-vbytes is)
+          %+  turn  is
+          |=(i=input [utxo.i ~ [bipt.w chyg.i idx.i]])
+          txos
+      ==
     --
   ::  single-random-draw
   ::    randomly choose utxos until target is hit

sur/btc-wallet-store.hoon

@@ -50,7 +50,7 @@
 +$  key  [=bipt =chyg =idx]
 +$  txi  [=utxo raw-tx=(unit buffer) =key]
 +$  txo  [=address value=sats]
-+$  txbu  [txis=(list txi) txos=(list txo)]
++$  txbu  [=vbytes txis=(list txi) txos=(list txo)]
 ::  TODO: document
 ::
 +$  batch  [todo=(set idx) endpoint=idx has-used=?]
@@ -66,12 +66,12 @@
   $%  [%add-wallet =xpub scan-to=(unit scon) max-gap=(unit @ud) confs=(unit @ud)]
       [%address-info =xpub =chyg =idx utxos=(set utxo) used=? blockcount=@ud]
       [%generate-address =xpub =chyg meta=(unit [payer=ship value=sats])]
-      [%generate-txbu =xpub feyb=sats txos=(list txo)]
+      [%generate-txbu =xpub payee=(unit ship) feyb=sats txos=(list txo)]
   ==
 ::
 +$  update
   $%  [%generate-address =address meta=(unit [payer=ship value=sats])]
-      [%generate-txbu =xpub =vbytes =txbu]
+      [%generate-txbu =xpub payee=(unit ship) =txbu]
       [%scan-done =xpub]
   ==
 ::