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fundpsbt/utxopsbt: new min_witness_weight param

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Needed for v2 of channel opens, where the minimum weight is 110; a
'simple utxo' (sig + key) weighs in at 107, so we a need a way to
establish a floor for this case.

Changelog-Added: JSON-RPC: fundpsbt/utxopsbt have new param, `min_witness_utxo`, which sets a floor for the weight calculation of an added input
This commit is contained in:
niftynei
2020-11-17 19:45:23 -06:00
committed by Rusty Russell
parent b4aebc17a1
commit e81d78ec4c
7 changed files with 44 additions and 13 deletions
Download Patch File Download Diff File Expand all files Collapse all files

11
common/utxo.c
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@@ -64,7 +64,14 @@ struct utxo *fromwire_utxo(const tal_t *ctx, const u8 **ptr, size_t *max)
return utxo; return utxo;
} }
size_t utxo_spend_weight(const struct utxo *utxo) size_t utxo_spend_weight(const struct utxo *utxo, size_t min_witness_weight)
{ {
return bitcoin_tx_simple_input_weight(utxo->is_p2sh); size_t wit_weight = bitcoin_tx_simple_input_witness_weight();
/* If the min is less than what we'd use for a 'normal' tx,
* we return the value with the greater added/calculated */
if (wit_weight < min_witness_weight)
return bitcoin_tx_input_weight(utxo->is_p2sh,
min_witness_weight);
return bitcoin_tx_input_weight(utxo->is_p2sh, wit_weight);
} }

2
common/utxo.h
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@@ -74,5 +74,5 @@ void towire_utxo(u8 **pptr, const struct utxo *utxo);
struct utxo *fromwire_utxo(const tal_t *ctx, const u8 **ptr, size_t *max); struct utxo *fromwire_utxo(const tal_t *ctx, const u8 **ptr, size_t *max);
/* Estimate of (signed) UTXO weight in transaction */ /* Estimate of (signed) UTXO weight in transaction */
size_t utxo_spend_weight(const struct utxo *utxo); size_t utxo_spend_weight(const struct utxo *utxo, size_t min_witness_weight);
#endif /* LIGHTNING_COMMON_UTXO_H */ #endif /* LIGHTNING_COMMON_UTXO_H */

9
doc/lightning-fundpsbt.7 generated
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@@ -3,7 +3,7 @@
lightning-fundpsbt - Command to populate PSBT inputs from the wallet lightning-fundpsbt - Command to populate PSBT inputs from the wallet
.SH SYNOPSIS .SH SYNOPSIS
\fBfundpsbt\fR \fIsatoshi\fR \fIfeerate\fR \fIstartweight\fR [\fIminconf\fR] [\fIreserve\fR] [\fIlocktime\fR] \fBfundpsbt\fR \fIsatoshi\fR \fIfeerate\fR \fIstartweight\fR [\fIminconf\fR] [\fIreserve\fR] [\fIlocktime\fR] [\fImin_witness_weight\fR]
.SH DESCRIPTION .SH DESCRIPTION
@@ -43,6 +43,11 @@ called (successfully, with \fIexclusive\fR true) on the returned PSBT\.
\fIlocktime\fR is an optional locktime: if not set, it is set to a recent \fIlocktime\fR is an optional locktime: if not set, it is set to a recent
block height\. block height\.
\fImin_witness_weight\fR is an optional minimum weight to use for a UTXO's
witness\. If the actual witness weight is greater than the provided minimum,
the actual witness weight will be used\.
.SH EXAMPLE USAGE .SH EXAMPLE USAGE
Let's assume the caller is trying to produce a 100,000 satoshi output\. Let's assume the caller is trying to produce a 100,000 satoshi output\.
@@ -104,4 +109,4 @@ Rusty Russell \fI<rusty@rustcorp.com.au\fR> is mainly responsible\.
Main web site: \fIhttps://github.com/ElementsProject/lightning\fR Main web site: \fIhttps://github.com/ElementsProject/lightning\fR
\" SHA256STAMP:8eb6970e2d625198db9b8e5ab7f90f9fb141744a837f58ee68ef54d28c7066b0 \" SHA256STAMP:a8b9705274638127c2f5ec4e97ed94e6d7f6b6b10a76c2248e8bc8b36dd804ff

6
doc/lightning-fundpsbt.7.md
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@@ -4,7 +4,7 @@ lightning-fundpsbt -- Command to populate PSBT inputs from the wallet
SYNOPSIS SYNOPSIS
-------- --------
**fundpsbt** *satoshi* *feerate* *startweight* \[*minconf*\] \[*reserve*\] \[*locktime*\] **fundpsbt** *satoshi* *feerate* *startweight* \[*minconf*\] \[*reserve*\] \[*locktime*\] \[*min_witness_weight*\]
DESCRIPTION DESCRIPTION
----------- -----------
@@ -39,6 +39,10 @@ called (successfully, with *exclusive* true) on the returned PSBT.
*locktime* is an optional locktime: if not set, it is set to a recent *locktime* is an optional locktime: if not set, it is set to a recent
block height. block height.
*min_witness_weight* is an optional minimum weight to use for a UTXO's
witness. If the actual witness weight is greater than the provided minimum,
the actual witness weight will be used.
EXAMPLE USAGE EXAMPLE USAGE
------------- -------------

9
doc/lightning-utxopsbt.7 generated
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@@ -3,7 +3,7 @@
lightning-utxopsbt - Command to populate PSBT inputs from given UTXOs lightning-utxopsbt - Command to populate PSBT inputs from given UTXOs
.SH SYNOPSIS .SH SYNOPSIS
\fButxopsbt\fR \fIsatoshi\fR \fIfeerate\fR \fIstartweight\fR \fIutxos\fR [\fIreserve\fR] [\fIreservedok\fR] [\fIlocktime\fR] \fButxopsbt\fR \fIsatoshi\fR \fIfeerate\fR \fIstartweight\fR \fIutxos\fR [\fIreserve\fR] [\fIreservedok\fR] [\fIlocktime\fR] [\fImin_witness_weight\fR]
.SH DESCRIPTION .SH DESCRIPTION
@@ -31,6 +31,11 @@ if any of the \fIutxos\fR are already reserved\.
\fIlocktime\fR is an optional locktime: if not set, it is set to a recent \fIlocktime\fR is an optional locktime: if not set, it is set to a recent
block height\. block height\.
\fImin_witness_weight\fR is an optional minimum weight to use for a UTXO's
witness\. If the actual witness weight is greater than the provided minimum,
the actual witness weight will be used\.
.SH RETURN VALUE .SH RETURN VALUE
On success, returns the \fIpsbt\fR containing the inputs, \fIfeerate_per_kw\fR On success, returns the \fIpsbt\fR containing the inputs, \fIfeerate_per_kw\fR
@@ -70,4 +75,4 @@ Rusty Russell \fI<rusty@rustcorp.com.au\fR> is mainly responsible\.
Main web site: \fIhttps://github.com/ElementsProject/lightning\fR Main web site: \fIhttps://github.com/ElementsProject/lightning\fR
\" SHA256STAMP:e47331be08a0911c74e142f2255bf62a83b70b818c1cf39a9314aab8c17a6e47 \" SHA256STAMP:777710bb963f435193e92a55344c740c123d7aa4d54bf573c99a616f59eeee54

6
doc/lightning-utxopsbt.7.md
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@@ -4,7 +4,7 @@ lightning-utxopsbt -- Command to populate PSBT inputs from given UTXOs
SYNOPSIS SYNOPSIS
-------- --------
**utxopsbt** *satoshi* *feerate* *startweight* *utxos* \[*reserve*\] \[*reservedok*\] \[*locktime*\] **utxopsbt** *satoshi* *feerate* *startweight* *utxos* \[*reserve*\] \[*reservedok*\] \[*locktime*\] \[*min_witness_weight*\]
DESCRIPTION DESCRIPTION
----------- -----------
@@ -29,6 +29,10 @@ if any of the *utxos* are already reserved.
*locktime* is an optional locktime: if not set, it is set to a recent *locktime* is an optional locktime: if not set, it is set to a recent
block height. block height.
*min_witness_weight* is an optional minimum weight to use for a UTXO's
witness. If the actual witness weight is greater than the provided minimum,
the actual witness weight will be used.
RETURN VALUE RETURN VALUE
------------ ------------

14
wallet/reservation.c
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@@ -386,7 +386,7 @@ static struct command_result *json_fundpsbt(struct command *cmd,
{ {
struct utxo **utxos; struct utxo **utxos;
u32 *feerate_per_kw; u32 *feerate_per_kw;
u32 *minconf, *weight; u32 *minconf, *weight, *min_witness_weight;
struct amount_sat *amount, input, diff; struct amount_sat *amount, input, diff;
bool all, *reserve; bool all, *reserve;
u32 *locktime, maxheight; u32 *locktime, maxheight;
@@ -398,6 +398,8 @@ static struct command_result *json_fundpsbt(struct command *cmd,
p_opt_def("minconf", param_number, &minconf, 1), p_opt_def("minconf", param_number, &minconf, 1),
p_opt_def("reserve", param_bool, &reserve, true), p_opt_def("reserve", param_bool, &reserve, true),
p_opt("locktime", param_number, &locktime), p_opt("locktime", param_number, &locktime),
p_opt_def("min_witness_weight", param_number,
&min_witness_weight, 0),
NULL)) NULL))
return command_param_failed(); return command_param_failed();
@@ -427,7 +429,9 @@ static struct command_result *json_fundpsbt(struct command *cmd,
"impossible UTXO value"); "impossible UTXO value");
/* But also adds weight */ /* But also adds weight */
*weight += utxo_spend_weight(utxo); fprintf(stderr, "min_witness_weight is %u\n",
*min_witness_weight);
*weight += utxo_spend_weight(utxo, *min_witness_weight);
continue; continue;
} }
@@ -555,7 +559,7 @@ static struct command_result *json_utxopsbt(struct command *cmd,
const jsmntok_t *params) const jsmntok_t *params)
{ {
struct utxo **utxos; struct utxo **utxos;
u32 *feerate_per_kw, *weight; u32 *feerate_per_kw, *weight, *min_witness_weight;
bool all, *reserve, *reserved_ok; bool all, *reserve, *reserved_ok;
struct amount_sat *amount, input, excess; struct amount_sat *amount, input, excess;
u32 current_height, *locktime; u32 current_height, *locktime;
@@ -568,6 +572,8 @@ static struct command_result *json_utxopsbt(struct command *cmd,
p_opt_def("reserve", param_bool, &reserve, true), p_opt_def("reserve", param_bool, &reserve, true),
p_opt_def("reservedok", param_bool, &reserved_ok, false), p_opt_def("reservedok", param_bool, &reserved_ok, false),
p_opt("locktime", param_number, &locktime), p_opt("locktime", param_number, &locktime),
p_opt_def("min_witness_weight", param_number,
&min_witness_weight, 0),
NULL)) NULL))
return command_param_failed(); return command_param_failed();
@@ -592,7 +598,7 @@ static struct command_result *json_utxopsbt(struct command *cmd,
"impossible UTXO value"); "impossible UTXO value");
/* But also adds weight */ /* But also adds weight */
*weight += utxo_spend_weight(utxo); *weight += utxo_spend_weight(utxo, *min_witness_weight);
} }
/* For all, anything above 0 is "excess" */ /* For all, anything above 0 is "excess" */