ec83d7a8a5
We also add a test for getlog, since it was never called by the testsuite. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
4.3 KiB
lightning-fundpsbt -- Command to populate PSBT inputs from the wallet
SYNOPSIS
fundpsbt satoshi feerate startweight [minconf] [reserve] [locktime] [min_witness_weight] [excess_as_change]
DESCRIPTION
fundpsbt is a low-level RPC command which creates a PSBT using unreserved
inputs in the wallet, optionally reserving them as well.
satoshi is the minimum satoshi value of the output(s) needed (or the string "all" meaning use all unreserved inputs). If a value, it can be a whole number, a whole number ending in sat, a whole number ending in 000msat, or a number with 1 to 8 decimal places ending in btc.
feerate can be one of the feerates listed in lightning-feerates(7), or one of the strings urgent (aim for next block), normal (next 4 blocks or so) or slow (next 100 blocks or so) to use lightningd’s internal estimates. It can also be a feerate is a number, with an optional suffix: perkw means the number is interpreted as satoshi-per-kilosipa (weight), and perkb means it is interpreted bitcoind-style as satoshi-per-kilobyte. Omitting the suffix is equivalent to perkb.
startweight is the weight of the transaction before fundpsbt has added any inputs.
minconf specifies the minimum number of confirmations that used outputs should have. Default is 1.
reserve is either boolean or a number: if true or a non-zero number then reserveinputs is called (successfully, with exclusive true) on the returned PSBT for this number of blocks (or 72 blocks if reserve is simply true).
locktime is an optional locktime: if not set, it is set to a recent 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.
excess_as_change is an optional boolean to flag to add a change output for the excess sats.
EXAMPLE USAGE
Let's assume the caller is trying to produce a 100,000 satoshi output.
First, the caller estimates the weight of the core (typically 42) and known outputs of the transaction (typically (9 + scriptlen) * 4). For a simple P2WPKH it's a 22 byte scriptpubkey, so that's 124 weight.
It calls "fundpsbt 100000sat slow 166", which succeeds, and returns the psbt and feerate_per_kw it used, the estimated_final_weight and any excess_msat.
If excess_msat is greater than the cost of adding a change output, the caller adds a change output randomly to position 0 or 1 in the PSBT. Say feerate_per_kw is 253, and the change output is a P2WPKH (weight 124), the cost is around 31 sats. With the dust limit disallowing payments below 546 satoshis, we would only create a change output if excess_msat was greater or equal to 31 + 546.
RETURN VALUE
On success, returns the psbt containing the inputs, feerate_per_kw showing the exact numeric feerate it used, estimated_final_weight for the estimated weight of the transaction once fully signed, and excess_msat containing the amount above satoshi which is available. This could be zero, or dust. If satoshi was "all", then excess_msat is the entire amount once fees are subtracted for the weights of the inputs and startweight.
If reserve was true or a non-zero number, then a reservations array is returned, exactly like reserveinputs.
If excess_as_change is true and the excess is enough to cover
an additional output above the dust_limit, then an output is
added to the PSBT for the excess amount. The excess_msat will
be zero. A change_outnum will be returned with the index of
the change output.
On error the returned object will contain code and message properties,
with code being one of the following:
- -32602: If the given parameters are wrong.
- -1: Catchall nonspecific error.
- 301: Insufficient UTXOs to meet satoshi value.
AUTHOR
Rusty Russell <rusty@rustcorp.com.au> is mainly responsible.
SEE ALSO
lightning-utxopsbt(7), lightning-reserveinputs(7), lightning-unreserveinputs(7).
RESOURCES
Main web site: https://github.com/ElementsProject/lightning