80dc829be7 tests: Calculate fees more similarly to CFeeRate::GetFee (Andrew Chow)
ce2cc44afd tests: Test for assertion when feerate is rounded down (Andrew Chow)
0fbaef9676 fees: Always round up fee calculated from a feerate (Andrew Chow)
Pull request description:
When calculating the fee for a feerate, it is possible that the final calculation will have fractional satoshis. Currently those are ignored via truncation which results in the absolute fee being rounded down. Rounding down is problematic because it results in a feerate that is slightly lower than the feerate represented by the `CFeeRate` object. A slightly lower feerate particularly causes issues for coin selection as it can trigger an assertion error. To avoid potentially underpaying the feerate (and the assertion), always round up the calculated fee.
A test is added for the assertion, along with a comment explaining what happens.
It is unlikely that a user can trigger this as it requires a very specific set of rounding errors to occur as well as the transaction not needing any change and being right on the lower bound of the exact match window. However I was able to trigger the assertion while running coin selection simulations, albeit after thousands of transactions and with some weird feerates.
ACKs for top commit:
ryanofsky:
Code review ACK 80dc829be7
promag:
Tested ACK 80dc829be7.
lsilva01:
tACK 80dc829
meshcollider:
utACK 80dc829be7
Tree-SHA512: fe26684c60f236cab48ea6a4600c141ce766dbe59504ec77595dcbd7fd0b34559acc617007f4f499c9155d8fda0a336954413410ba862b19c765c0cfac79d642
The coin selection strategy for MiniWallet is quite straight-forward: simply
pick a single UTXO with the largest value:
self._utxos = sorted(self._utxos, key=lambda k: k['value'])
utxo_to_spend = utxo_to_spend or self._utxos.pop()
If there are several candidates with the same value, however, it is not clear
which one is taken. This can be particularly problematic for coinbase outputs
with fixed block subsidy, since spending could lead to a
'bad-txns-premature-spend-of-coinbase' reject if an UTXO from a too-recent
block is picked. Introduce block height as second criteria (saved in
self._utxos in the methods generate(...) and rescan_utxos(...)), in order to
avoid potential issues with coinbases that are not matured yet.
fac62e6ff5 test: Delete generate* calls from TestNode (MarcoFalke)
fac7f6102f test: Use generate* node RPC, not wallet RPC (MarcoFalke)
faac1cda6e test: Use generate* from TestFramework, not TestNode (MarcoFalke)
Pull request description:
Deleting the methods is needed for #22567 to pave the way to make it easier to implicitly call the `sync_all` member function.
Without the methods being deleted, nothing prevents developers from adding calls to it. As history showed, developers *will* add calls to it. For example, see commit eb02dbba3c from today or the first commit in this pull request.
ACKs for top commit:
stratospher:
Tested ACK fac62e6.
brunoerg:
tACK fac62e6ff5
promag:
Code review ACK fac62e6ff5.
Tree-SHA512: 6d4dea8f95ead954acfef2e6a5d98897ce0c2d02265c5b137bb149d0265543bd51d7e8403e1945b9af75df5524ca50064fe1d2a432b25c8abc71bbb28ed6ed53
Because of floating point precision issues, not all of the rounding done
is always correct. To fix this, the fee calculation for
assert_fee_amount is changed to better reflect how CFeeRate::GetFee does
it.
First the feerate is converted to an int representing sat/kvb. Then this
is multiplied by the transaction size, divivided by 1000, and rounded up
to the nearest sat. The result is then converted back to BTC (divided by
1e8) and then rounded down to the nearest sat to avoid precision errors.
429b49378e test: introduce script_util helper for creating P2PK scripts (Sebastian Falbesoner)
Pull request description:
This PR is a follow-up to #22363, which took use of already existing `script_util` helpers to get rid of manual CScript for the P2{PKH,SH,WPKH,WSH} output types, in order to increase readability and maintainability of the test code. Here the same is done for P2PK scripts by introducing a helper `key_to_p2pk_script` and using it. Note that the helper only accepts ECDSA pubkeys (i.e. ones with a size of 33 or 65 bytes), hence it can't be used for scripts in the form of [x-only-pubkey, OP_CHECKSIG].
ACKs for top commit:
brunoerg:
Code review ACK 429b49378e
laanwj:
Code review ACK 429b49378e
rajarshimaitra:
Concept + tACK https://github.com/bitcoin/bitcoin/pull/23118/commits/429b49378ee3a3d73abe276cfd176c1ca08bf9b9
Tree-SHA512: 984aea01eba5f38a328d69905d90a3a36f0a02419ca3e5baf3c8095895fb094e3780c7da16fad5851db3847bdb05ce8cda244ab09b79b8aa9602dfb3c5e0414c
