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wally: Add setters for output amounts, input witnesses and scripts

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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>
This commit is contained in:
Christian Decker
2019-03-20 16:41:29 +01:00
committed by Rusty Russell
parent 73ab7e6d5f
commit 03329a61da
2 changed files with 60 additions and 0 deletions
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35
bitcoin/tx.c
View File

@@ -84,6 +84,41 @@ bool bitcoin_tx_check(const struct bitcoin_tx *tx)
return memeq(oldtx, tal_bytelen(oldtx), newtx, tal_bytelen(newtx));
}
void bitcoin_tx_output_set_amount(struct bitcoin_tx *tx, int outnum,
struct amount_sat *amount)
{
assert(outnum < tx->used_outputs);
tx->output[outnum].amount = *amount;
tx->wtx->outputs[outnum].satoshi = amount->satoshis; /* Raw: low-level helper */
}
void bitcoin_tx_input_set_witness(struct bitcoin_tx *tx, int innum,
u8 **witness)
{
struct wally_tx_witness_stack *stack = NULL;
size_t stack_size = tal_count(witness);
/* Free any lingering witness */
tal_free(tx->input[innum].witness);
tx->input[innum].witness = witness;
if (witness) {
wally_tx_witness_stack_init_alloc(stack_size, &stack);
for (size_t i = 0; i < stack_size; i++)
wally_tx_witness_stack_add(stack, witness[i],
tal_bytelen(witness[i]));
}
wally_tx_set_input_witness(tx->wtx, innum, stack);
if (stack)
wally_tx_witness_stack_free(stack);
}
void bitcoin_tx_input_set_script(struct bitcoin_tx *tx, int innum, u8 *script)
{
tx->input[innum].script = script;
wally_tx_set_input_script(tx->wtx, innum, script, tal_bytelen(script));
}
static void push_tx_input(const struct bitcoin_tx_input *input,
const u8 *input_script,
void (*push)(const void *, size_t, void *), void *pushp)

25
bitcoin/tx.h
View File

@@ -92,6 +92,31 @@ int bitcoin_tx_add_input(struct bitcoin_tx *tx, const struct bitcoin_txid *txid,
u32 outnum, u32 sequence,
const struct amount_sat *amount, u8 *script);
/**
* Set the output amount on the transaction.
*
* Allows changing the amount on the transaction output after it was set on
* creation. This is useful to grind a feerate or subtract the fee from an
* existing output.
*/
void bitcoin_tx_output_set_amount(struct bitcoin_tx *tx, int outnum,
struct amount_sat *amount);
/**
* Set the input witness.
*
* Given that we generate the witness after constructing the transaction
* itself, we need a way to attach a witness to an existing input.
*/
void bitcoin_tx_input_set_witness(struct bitcoin_tx *tx, int innum,
u8 **witness);
/**
* Set the input script on the given input.
*/
void bitcoin_tx_input_set_script(struct bitcoin_tx *tx, int innum, u8 *script);
/**
* Check a transaction for consistency.
*