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spec-update: get rid of max-witness-len

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We can use a fixed value and close the channel if they don't cover their
amount; this wasn't really helping with anything other than setting a
floor for an expected feerate
This commit is contained in:
niftynei
2020-09-09 19:40:29 +09:30
committed by Rusty Russell
parent 586b9aa742
commit b44e36b99e
5 changed files with 14 additions and 83 deletions
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42
common/psbt_open.c
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@@ -324,7 +324,6 @@ u8 *psbt_changeset_get_next(const tal_t *ctx, struct channel_id *cid,
if (tal_count(set->added_ins) != 0) {
const struct input_set *in = &set->added_ins[0];
u16 max_witness_len;
u8 *script;
if (!psbt_get_serial_id(&in->input.unknowns, &serial_id))
@@ -333,10 +332,6 @@ u8 *psbt_changeset_get_next(const tal_t *ctx, struct channel_id *cid,
const u8 *prevtx = linearize_wtx(ctx,
in->input.utxo);
if (!psbt_input_get_max_witness_len(&in->input,
&max_witness_len))
abort();
if (in->input.redeem_script_len)
script = tal_dup_arr(ctx, u8,
in->input.redeem_script,
@@ -347,7 +342,6 @@ u8 *psbt_changeset_get_next(const tal_t *ctx, struct channel_id *cid,
msg = towire_tx_add_input(ctx, cid, serial_id,
prevtx, in->tx_input.index,
in->tx_input.sequence,
max_witness_len,
script,
NULL);
@@ -440,49 +434,15 @@ int psbt_find_serial_output(struct wally_psbt *psbt, u16 serial_id)
return -1;
}
void psbt_input_add_max_witness_len(struct wally_psbt_input *input,
u16 max_witness_len)
{
u8 *key = psbt_make_key(tmpctx, PSBT_TYPE_MAX_WITNESS_LEN, NULL);
beint16_t bev = cpu_to_be16(max_witness_len);
psbt_input_add_unknown(input, key, &bev, sizeof(bev));
}
bool psbt_input_get_max_witness_len(const struct wally_psbt_input *input,
u16 *max_witness_len)
{
size_t value_len;
beint16_t bev;
void *result = psbt_get_lightning(&input->unknowns,
PSBT_TYPE_MAX_WITNESS_LEN,
&value_len);
if (!result)
return false;
if (value_len != sizeof(bev))
return false;
memcpy(&bev, result, value_len);
*max_witness_len = be16_to_cpu(bev);
return true;
}
bool psbt_has_required_fields(struct wally_psbt *psbt)
{
u16 max_witness, serial_id;
u16 serial_id;
for (size_t i = 0; i < psbt->num_inputs; i++) {
struct wally_psbt_input *input = &psbt->inputs[i];
if (!psbt_get_serial_id(&input->unknowns, &serial_id))
return false;
/* Inputs had also better have their max_witness_lens
* filled in! */
if (!psbt_input_get_max_witness_len(input, &max_witness))
return false;
/* Required because we send the full tx over the wire now */
if (!input->utxo)
return false;