This modifier splits a payment that has been attempted a number of times (by a
modifier earlier in the mod chain) and has failed consistently. It splits the
amount roughly in half, with a but if random fuzz, and then starts a new round
of attempts for the two smaller amounts.
Changelog-Added: The MPP presplit modifier splits large payments into 10k satoshi parts to maximize chances of performing the payment and to obfuscate the overall amount being sent.
With the `presplit`-modifier we actually skip execution of the root altogether
which results in the root not having a result at all. Instead we should use
the result returned by `payment_collect_result`.
With MPP we require that the sum of parts is equal to the `total_msat` amount
declared in the onion. Since that can't be changed once the first part arrives
we need a way to disable amount fuzzing for MPP.
We're actually going to deprecate this, so don't add new features!
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Changelog-Added: ***REMOVE*** JSON-API: `txprepare` returns a psbt version of the created transaction
It uses reservations heavily, and assumed we generated change, etc.
It's now a simpler test, in many ways.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Technically, they could do this themselves, but it's much nicer to have one
place to do it (and it makes sure we get the required information into the
PSBT, which is actually not entirely accessible through listfunds, as that
doesn't want to consult with the HSM for close outputs).
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Changelog-Added: JSON RPC: new low-level coin selection `fundpsbt` routine.
This is the normal case: you only want to reserve inputs which
are not already reserved. This saves you iterating through the
results and unreserving some if you weren't exclusive.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
reserveinputs marks UTXOs reserved for 12 hours, so we won't select them
for spending: unreserveinputs marks them available again.
Exposes param_psbt() for wider use.
Disabled the test_sign_and_send_psbt since we're altering the API;
the final patch restores it.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This is a new fundamental routine to obtain UTXOs from the database.
It's not the most efficient approach, as it returns a single UTXO at a
time, but it can consolidate all our UTXO handling (becoming more
complex by the reservation timeout logic).
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
These keep the struct utxo in sync with the database, explicitly:
these will be the only places where utxo->status is set.
The old routines will be removed at the end.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Technically an API break, but nobody relies on these I hope!
Note that the feerates warning was buried inside the style object:
it should be top-level.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
We were applying the fee exemption to all payments individually, which is ok
until we switch to MPP, where amounts change. Also the log entry was referring
to the total amount, and not the fee of the payment.
This was causing the state flapping test to fail, since we were yielding
control of the io_loop, waiting for the blockheight to be reached, and not
setting the status beforehand. An interim `paystatus` call would then find a
failed leaf and deduce the entire payment failed. Setting it back to the
previous state keeps the overall payment pending while we wait.
As suggested during the paymod-03 review it is better to activate the new code
right away, and give users an escape hatch to use the legacy code instead. The
way I implemented it allows using either `legacypay` or `pay` and then set
`legacy` to switch to the other implementation.
Changelog-Added: JSON-RPC: The `pay` command now uses the new payment flow, the new `legacypay` command can be used to issue payment with the legacy code if required.
Suggested-by: Rusty Russell <@rustyrussell>
Suggested-by: ZmnSCPxj <@zmnscpxj>
This makes use of the payment modifier structure to just add the preimage to
the TLV payload for the last hop.
Changelog-Added: JSON-RPC: The `keysend` command allows sending to a node without requiring an invoice first.
PSETs have a bit different requirements. The witness_utxo needs
the asset tag + values, and these should also be added to the PSET
struct separately as well. To do this, we create a new 'init' method for
elements inputs, which takes care of the elements specific things.
We don't preserve detailed asset information at the moment, so provide a
way to convert from a sat to an amount_asset struct.
We also need a way to convert from an 'amount_asset' to a 'value' for
elements, which for explicit (i.e. non-blinded) asssets is a 0x01 prefix
plus the big-endian encoded value.
Christian Decker
Rusty Russell
niftynei
ZmnSCPxj jxPCSnmZ