We roll the `elements_add_fee_output` function and the cropping of
overallocated arrays into the `bitcoin_tx_finalize` function. This is supposed
to be the final cleanup and compaction step before a tx can be sent to bitcoin
or passed off to other daemons.
This is the cleanup promised in #3491
This sets the nLockTime to the tip (and accordingly each input's nSequence to
0xfffffffe) for withdrawal transactions.
Even if the anti fee-sniping argument might not be valid until some time yet,
this makes our regular wallet transactions far less distinguishable from
bitcoind's ones since it now defaults to using native Segwit transactions
(like us). Moreover other wallets are likely to implement this (if they
haven't already).
Changelog-Added: wallet: withdrawal transactions now sets nlocktime to the current tip.
this is unnecessary, and actually severely limits the functionality
of `wally_tx_add_input`, which will expand the allocated input
length if there's not enough room for the additional input
```external/libwally-core/src/transaction.c
if (tx->num_inputs >= tx->inputs_allocation_len) {
/* Expand the inputs array */
struct wally_tx_input *p;
p = realloc_array(tx->inputs, tx->inputs_allocation_len,
tx->num_inputs + 1, sizeof(*tx->inputs));
...
tx->inputs = p;
tx->inputs_allocation_len += 1;
```
Currently the only source for amount_asset is the value getter on a tx output,
and we don't hand it too far around (mainly ignoring it if it isn't the
chain's main currency). Eventually we could bubble them up to the wallet, use
them to select outputs or actually support assets in the channels.
Since we don't hand them around too widely I thought it was ok for them to be
pass-by-value rather than having to allocate them and pass them around by
reference. They're just 41 bytes currently so the overhead should be ok.
Signed-off-by: Christian Decker <@cdecker>
We now have a pointer to chainparams, that fails valgrind if we do anything
chain-specific before setting it.
Suggested-by: Rusty Russell <@rustyrussell>
We used to match specifically on `is_elements && coinbase`, but we can just
hand off responsibility to libwally and then make sure we handle it correctly.
This is the main reason we started weaving the chainparams everywhere: being
able to compare the asset type with the fee paying asset tag, thus determining
the value of the asset correctly (we still treat any non-fee-paying assets as
having value 0).
Signed-off-by: Christian Decker <decker.christian@gmail.com>
Especially when we grind fees we may end up setting the fees several times, so
instead of always adding a new fee output look for an existing one and set its
value.
Signed-off-by: Christian Decker <decker.christian@gmail.com>
We use to use the non-elements ones and then patch them manually. By using the
correct ones right from the start we have less work on our side.
Signed-off-by: Christian Decker <decker.christian@gmail.com>
If we are handling an elements transaction the value is not stored in the
satoshi field, rather it is stored in the `value` field which is prefixed with
a version (0x01) and is counted in `asset` units.
Signed-off-by: Christian Decker <decker.christian@gmail.com>
Skipping coinbase transactions and ensuring that the transaction is serialized
correctly when sending it onwards.
Signed-off-by: Christian Decker <decker.christian@gmail.com>
This was a bit of trial and error due to libwally not liking hints when it
comes to length measurements, also the parsing bumps against a masking issue
in libwally that I'd following up on their issue tracker.
Signed-off-by: Christian Decker <decker.christian@gmail.com>
This is the normal convention for this type; it makes using converters
a little easier. See next patch.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This is the other origin, besides `bitcoin_tx`, where we create `bitcoin_tx`
instances, so add the context as soon as possible. Sadly I can't weave the
chainparams into the deserialization code since that'd need to change all the
generated wire code as well.
Signed-off-by: Christian Decker <decker.christian@gmail.com>
The way we build transactions, serialize them, and compute fees depends on the
chain we are working on, so let's add some context to the transactions.
Signed-off-by: Christian Decker <decker.christian@gmail.com>
This is what all of this has been working towards: ripping out the handwoven
transaction handling. By removing the custom parsing we can finally switch
over to using `wally_tx` as sole representation of transactions in
memory. The commit is a bit larger but it's mostly removing setters and old
references to the input and output fields.
Signed-off-by: Christian Decker <decker.christian@gmail.com>
These are handled internally in the `wally_tx` and do not conform to our usual
tallocated strings that can by inspected using `tal_bytelen`, and we don't
really want to litter our code with whitelisting comments for the
`amount_sat.satoshis` access, so these just do read-only on the fly conversions.
Signed-off-by: Christian Decker <decker.christian@gmail.com>
The `wally_tx_input`s do not keep track of their input value, which means we
need to track them ourselves if we try to sign these transactions at a later
point in time.
Signed-off-by: Christian Decker <decker.christian@gmail.com>
These are used when grinding the feerate and signing. These are just simple
facades that keep both wally and old style transactions in sync.
Signed-off-by: Christian Decker <decker.christian@gmail.com>
During the migration to `libwally` we want to make absolutely sure that both
transactions are generated identical, and can eventually be switched over.
Signed-off-by: Christian Decker <decker.christian@gmail.com>
We are slowly migrating towards a wally-transactions only world, but to make
this reviewable we start building both old and new style transactions in
parallel. In a second pass we'll then start removing the old ones and use
libwally only.
Signed-off-by: Christian Decker <decker.christian@gmail.com>
We need to do it in various places, but we shouldn't do it lightly:
the primitives are there to help us get overflow handling correct.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
We currently make sure that all the bitcoin_tx input scripts are NULL
and set the input script of the input we're signing, so we can easily
reuse the tx hashing code for signature checks. This means that we
sometimes jump through hoops to make sure input scripts are NULL, and
also means that the tx can't be const.
Put more logic inside bitcoin/tx so it can simply ignore things we
don't want to hash.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Christian Decker
Ken Sedgwick
darosior
lisa neigut
Yash Bhutwala
trueptolemy
Rusty Russell