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update-channel: prepare a new tx with modified amounts.

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Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell
2015-06-08 16:14:52 +09:30
parent ecb39efed1
commit d51f6372aa
8 changed files with 165 additions and 4 deletions
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11
commit_tx.c
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@@ -9,6 +9,7 @@
struct bitcoin_tx *create_commit_tx(const tal_t *ctx,
OpenChannel *ours,
OpenChannel *theirs,
int64_t delta,
const struct sha256_double *anchor_txid,
unsigned int anchor_output)
{
@@ -42,7 +43,11 @@ struct bitcoin_tx *create_commit_tx(const tal_t *ctx,
if (ours->anchor->total < ours->commitment_fee)
return tal_free(tx);
tx->output[0].amount = ours->anchor->total - ours->commitment_fee;
/* Asking for more than we have? */
if (delta < 0 && -delta > tx->output[0].amount)
return tal_free(tx);
tx->output[0].amount += delta;
/* Second output is a P2SH payment to them. */
if (!proto_to_pubkey(theirs->final, &to_me))
return tal_free(tx);
@@ -54,6 +59,10 @@ struct bitcoin_tx *create_commit_tx(const tal_t *ctx,
if (theirs->anchor->total < theirs->commitment_fee)
return tal_free(tx);
tx->output[1].amount = theirs->anchor->total - theirs->commitment_fee;
/* Asking for more than they have? */
if (delta > 0 && delta > tx->output[1].amount)
return tal_free(tx);
tx->output[0].amount -= delta;
permute_outputs(ours->seed, theirs->seed, 1, tx->output, 2, NULL);
return tx;