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wallet: wallet_select_all to select everything.

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Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2017-12-20 06:22:45 +10:30
parent bd0b762b2f
commit 8cd7ebb924
2 changed files with 55 additions and 16 deletions
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66
wallet/wallet.c
View File

@ -131,20 +131,22 @@ void wallet_confirm_utxos(struct wallet *w, const struct utxo **utxos)
}
}
const struct utxo **wallet_select_coins(const tal_t *ctx, struct wallet *w,
const u64 value,
const u32 feerate_per_kw,
u64 *fee_estimate, u64 *changesatoshi)
static const struct utxo **wallet_select(const tal_t *ctx, struct wallet *w,
const u64 value,
const u32 feerate_per_kw,
u64 *satoshi_in,
u64 *fee_estimate)
{
size_t i = 0;
struct utxo **available;
const struct utxo **utxos = tal_arr(ctx, const struct utxo *, 0);
*fee_estimate = 0;
/* We assume two outputs for the weight. */
u64 satoshi_in = 0, weight = (4 + (8 + 22) * 2 + 4) * 4;
u64 weight = (4 + (8 + 22) * 2 + 4) * 4;
tal_add_destructor2(utxos, destroy_utxos, w);
*fee_estimate = 0;
*satoshi_in = 0;
available = wallet_get_utxos(ctx, w, output_state_available);
for (i = 0; i < tal_count(available); i++) {
@ -163,22 +165,54 @@ const struct utxo **wallet_select_coins(const tal_t *ctx, struct wallet *w,
/* Account for witness (1 byte count + sig + key */
weight += 1 + (1 + 73 + 1 + 33);
*fee_estimate = weight * feerate_per_kw / 1000;
satoshi_in += utxos[i]->amount;
if (satoshi_in >= *fee_estimate + value)
*satoshi_in += utxos[i]->amount;
if (*satoshi_in >= *fee_estimate + value)
break;
}
tal_free(available);
if (satoshi_in < *fee_estimate + value) {
/* Could not collect enough inputs, cleanup and bail */
utxos = tal_free(utxos);
} else {
*changesatoshi = satoshi_in - value - *fee_estimate;
}
return utxos;
}
const struct utxo **wallet_select_coins(const tal_t *ctx, struct wallet *w,
const u64 value,
const u32 feerate_per_kw,
u64 *fee_estimate, u64 *changesatoshi)
{
u64 satoshi_in;
const struct utxo **utxo;
utxo = wallet_select(ctx, w, value, feerate_per_kw,
&satoshi_in, fee_estimate);
/* Couldn't afford it? */
if (satoshi_in < *fee_estimate + value)
return tal_free(utxo);
*changesatoshi = satoshi_in - value - *fee_estimate;
return utxo;
}
const struct utxo **wallet_select_all(const tal_t *ctx, struct wallet *w,
const u32 feerate_per_kw,
u64 *value,
u64 *fee_estimate)
{
u64 satoshi_in;
const struct utxo **utxo;
/* Huge value, but won't overflow on addition */
utxo = wallet_select(ctx, w, (1ULL << 56), feerate_per_kw,
&satoshi_in, fee_estimate);
/* Can't afford fees? */
if (*fee_estimate > satoshi_in)
return tal_free(utxo);
*value = satoshi_in - *fee_estimate;
return utxo;
}
bool wallet_can_spend(struct wallet *w, const u8 *script,
u32 *index, bool *output_is_p2sh)
{

5
wallet/wallet.h
View File

@ -137,6 +137,11 @@ const struct utxo **wallet_select_coins(const tal_t *ctx, struct wallet *w,
u64 *fee_estimate,
u64 *change_satoshi);
const struct utxo **wallet_select_all(const tal_t *ctx, struct wallet *w,
const u32 feerate_per_kw,
u64 *value,
u64 *fee_estimate);
/**
* wallet_confirm_utxos - Once we've spent a set of utxos, mark them confirmed.
*