We force use of tal_wally_start/tal_wally_end around every wally
allocation, and with "end" make the caller choose where to reparent
everything.
This is particularly powerful where we allocate a tx or a psbt: we
want that tx or psbt to be the parent of the other allocations, so
this way we can reparent the tx or psbt, then reparent everything
else onto it.
Implementing psbt_finalize (which uses a behavior flag antipattern)
was tricky, so I ended up splitting that into 'psbt_finalize' and
'psbt_final_tx', which I think also makes the callers clearer.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Most of what it does was actually a function of adding the input metadata
to the PSBT, so call that and simply copy out the tx input it creates.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Includes:
psbt: Use renamed functions for new wally version
psbt: Set the transaction directly to avoid script workarounds
psbt: Use low-S grinding when computing signatures
tx: Use wally_tx_clone from libwally now that its exported
Signed-off-by: Jon Griffiths <jon_p_griffiths@yahoo.com>
PSETs have a bit different requirements. The witness_utxo needs
the asset tag + values, and these should also be added to the PSET
struct separately as well. To do this, we create a new 'init' method for
elements inputs, which takes care of the elements specific things.
These are pulled from wallet/wallet.c, with the fix now that we grind sigs.
This reduces the fees we pay slightly, as you can see in the coinmoves changes.
I now print out all the coin moves in suitable format before we match:
you only see this if the test fails, but it's really helpful.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
most likely unused since the switch to libwally for internal blockchain
things.
these method names were clashing with ones that are to be introduced
with some libwally cleanups, so getting rid of them pre-emptively keeps
us libwally compatible
the bitcoin_tx version is basically a wrapper for the wally_tx script
extraction -- here we pull it apart so we can easily get a tal'd script
for a wally_tx_output
will either use a temporary psbt (and not munge the passed in psbt)
or will finalize in place -- finalization erases most of the signature
metadata from the psbt struct
We're not using the change_outnum for withdraw tx's (and the way
we were calculating it was broken as of the addition of 'multiple
outputs'). This removes the change output knowhow from withdraw_tx
entirely, and pushes the responsibility up to the caller to
include the change output in the output set if desired.
Consequently, we also remove the change output knowhow from hsmd.
Prior to this commit, passing a NULL stack to `bitcoin_tx_input_set_witness`
unsets the witness stack on the bitcoin_tx's wally_tx but leaves the
final witness on the PSBT unchanged.
at the moment, libwally's `wally_psbt_input_set_final_witness` will blow
up if you attempt to set a NULL witness -- instead we manually remove it
if the passed in stack is NULL. previously we would leave the PSBT's
witness unchanged.
Update the `bitcoin_tx_add_input` interface to accept a witness script
and or scriptPubkey.
We save the amount + witness script + witness program (if known) to
the PSBT object for a transaction when creating an input.
These are useful for tx_parts:
1. wally_txid.
2. linearize_wtx.
3. wally_tx_input_spends
4. wally_tx_output_get_amount
5. wally_tx_input_get_txid
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
now that witness script data is saved into the tx/psbt which is
serialized across the wire, there's no reason to use witscript to do
this. good bye witscript!
Move all psbt creation into single method, new_psbt
note that if a psbt is init'd for a transaction that's
deserialized with scripts etc already attached, then set_global_tx
will fail. instead, we empty all of this out first.
if the tx is being re-init'd from a tx source that had a psbt attached
(e.g. fromwire_) then the script/witness data will get populated
appropriatel from there.
niftynei
Jon Griffiths
Rusty Russell
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