Wallet: Add `max_tx_weight` to transaction funding options (take 2) #29523

ismaelsadeeq · 2024-03-01T09:38:37Z

This PR taken over from #29264

The PR added an option max_tx_weight to transaction funding RPC's that ensures the resulting transaction weight does not exceed the specified max_tx_weight limit.

If max_tx_weight is not given MAX_STANDARD_TX_WEIGHT is used as the max threshold.

This PR addressed outstanding review comments in #29264

For more context and rationale behind this PR see https://delvingbitcoin.org/t/lightning-transactions-with-v3-and-ephemeral-anchors/418/11?u=instagibbs

DrahtBot · 2024-03-01T09:38:40Z

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Code Coverage

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Reviews

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Type	Reviewers
ACK	furszy, rkrux, achow101
Concept ACK	murchandamus
Stale ACK	Eunovo

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Conflicts

No conflicts as of last run.

ismaelsadeeq · 2024-03-01T10:27:37Z

Some C.I jobs are failing, putting in draft while I try to address that.

murchandamus

Concept ACK

src/wallet/spend.cpp

src/wallet/coinselection.cpp

src/wallet/coinselection.h

src/wallet/rpc/spend.cpp

src/wallet/spend.cpp

test/functional/rpc_psbt.py

src/wallet/rpc/spend.cpp

ismaelsadeeq · 2024-04-04T10:54:33Z

Force pushed from 53ee67d to 3a64b3a compare diff

Addressed review comment
Rebased on master after ci: Temporarily disable bpfcc-tools #29788

furszy

Any chance to turn the first commit into an scripted-diff?

Eunovo · 2024-04-04T15:10:15Z

Tested ACK 3a64b3a
Verified fuzz tests

ismaelsadeeq · 2024-04-05T16:02:27Z

Any chance to turn the first commit into an scripted-diff?

The commit message was misleading It's not just renaming max_weight, it also updates the input parameter docstring to match the new name, some comment updates, and also the fuzz test renames has more info like low_max_selection_weight and high_max_selection_weight.

I've updated the commit message of the first commit 2706393

DrahtBot · 2024-04-24T23:55:58Z

🚧 At least one of the CI tasks failed. Make sure to run all tests locally, according to the
documentation.

Possibly this is due to a silent merge conflict (the changes in this pull request being
incompatible with the current code in the target branch). If so, make sure to rebase on the latest
commit of the target branch.

Leave a comment here, if you need help tracking down a confusing failure.

_{Debug: https://github.com/bitcoin/bitcoin/runs/23495200918}

ismaelsadeeq · 2024-06-10T10:32:44Z

Rebased to fix conflict after #28366 was merged.
b24b7a9a6..845d16c1b

furszy

few small comments

src/wallet/spend.cpp

furszy · 2024-06-19T22:20:42Z

test/functional/test_framework/blocktools.py

nit: could replace this line with this constant.

leaving this as is, as I suspect there might be other places that needs to be replaced also.
this and others can come in a separate PR ?

ismaelsadeeq · 2024-06-20T08:12:00Z

thanks for your review @furszy will force push to address this comments shortly.

rkrux

Concept ACK a120fc7, but I would look at 723a8da commit a bit more again; make, test/functional are successful though.

Following transaction funding RPCs are affected with the addition of max_tx_weight option:

fundrawtransaction
walletcreatefundedpsbt
send

src/wallet/coinselection.cpp

rkrux · 2024-06-24T11:26:08Z

src/wallet/coinselection.h

This change ensures consistency in transaction size and weight calculation
within the wallet and prevents conversion overflow when calculating
max_selection_weight.

Are the inconsistencies because size_t is platform dependent and int is not (at least for the purposes of core because of this: https://github.com/bitcoin/bitcoin/blob/v26.0/src/compat/assumptions.h#L44)?
I still need to digest this comment: #29523 (comment)

It's simply just to ensure consistency in transaction size and weight calculation within the wallet and prevents conversion overflow when calculating max_selection_weight as it happened here https://cirrus-ci.com/task/6341256662482944

I think it definitely will be worth it to define a datatype for size in the entire codebase.
But I am limiting this change to affect only the wallet size variables change_output_size, change_spend_size and tx_noinputs_size, because they relate to this PR.

test/functional/rpc_psbt.py

…x weight 72b2268 wallet: notify when preset + automatic inputs exceed max weight (furszy) Pull request description: Small change. Found it while finishing my review on #29523. This does not interfere with it. Basically, we are erroring out early when the automatic coin selection process exceeds the maximum weight, but we are not doing so when the user-preselected inputs combined with the wallet-selected inputs exceed the maximum weight. This change avoids signing all inputs before erroring out and introduces test coverage for `fundrawtransaction`. ACKs for top commit: achow101: ACK 72b2268 tdb3: re ACK for 72b2268 rkrux: tACK [72b2268](72b2268) ismaelsadeeq: utACK 72b2268 Tree-SHA512: d77be19231023383a9c79a5d66b642dcbc6ebfc31a363e0b9f063c44898720a7859ec211cdbc0914ac7a3bfdf15e52fb8fc20d97f171431f70492c0f159dbc36

furszy

Code reviewed b3ac1179ff90f, getting closer. Left few topics.

src/wallet/spend.cpp

test/functional/rpc_psbt.py

furszy · 2024-06-26T20:51:44Z

src/wallet/rpc/spend.cpp

Not sure about using tx_size, we would be returning an estimation of the final size of tx. Not the real/current tx weight.

What about getting the current tx weight by serializing the CMutableTransaction object that appears inside FinishTransaction and explain in the RPC return value description that the returned weight will not be the final one if the transaction is not complete.

Interesting, I agree with this point. Returning the exact size of the transaction would make the RPC definition more robust.

This commit (along with this^ suggestion) b3ac117 can be a separate PR as well, doesn't seem necessary for this PR to be merged if I didn't miss anything.

Yes it's not needed.
I removed this commit
This can come as a separate PR, the size output can also be added to the other funding RPC's?

…ght` name - This commit renames the coin selection algorithms input parameter `max_weight` to `max_selection_weight` for clarity. The parameter represent the maximum weight of the UTXOs the coin selection algorithm should select, not the transaction maximum weight. - The commit updates the parameter docstring to provide correct description. - Also updates coin selection unit and fuzzing test variables to match the new name.

`CoinGrinder` will also produce change output, listing all the Coin selection algorithms that produces change output is not maintainable, just infer that remaining algorithms all might produce change.

…_size` and `tx_noinputs_size` to `int` - This change ensures consistency in transaction size and weight calculation within the wallet and prevents conversion overflow when calculating `max_selection_weight`.

This allows a transaction's weight to be bound under a certain weight if possible and desired. This can be beneficial for future RBF attempts, or whenever a more restricted spend topology is desired. Co-authored-by: Greg Sanders <[email protected]>

ismaelsadeeq · 2024-06-27T14:39:32Z

Thanks for the reviews @furszy @rkrux

Force-pushed from b3ac1179ff90fe261af4e6dc9c7af64e1518b435 to d8febf6d9ea018cf8e980ee036fb5ccd8ea8887a
Compare diff b3ac1179ff..734076c6d

Changes:

Rebased after PR 30309 and updated the maximum transaction weight check to use the user passed value when given or default MAX_STANDARD_TX_WEIGHT.
Removed miscellaneous logs.
Added back the removed line in the rpc_psbt.py functional test according PEP guidelines.
Removed the last commit that returned the estimated size in the send RPC based on the review here.

furszy

utACK 734076c

furszy · 2024-06-27T16:20:57Z

src/wallet/spend.cpp

-
+    coin_selection_params.m_max_tx_weight = coin_control.m_max_tx_weight.value_or(MAX_STANDARD_TX_WEIGHT);
+    int minimum_tx_weight = MIN_STANDARD_TX_NONWITNESS_SIZE * WITNESS_SCALE_FACTOR;
+    if (coin_selection_params.m_max_tx_weight.value() < minimum_tx_weight || coin_selection_params.m_max_tx_weight.value() > MAX_STANDARD_TX_WEIGHT) {


In 734076c:

nano nit: shorter

Suggested change

if (coin_selection_params.m_max_tx_weight.value() < minimum_tx_weight || coin_selection_params.m_max_tx_weight.value() > MAX_STANDARD_TX_WEIGHT) {

if (*coin_selection_params.m_max_tx_weight < minimum_tx_weight || *coin_selection_params.m_max_tx_weight > MAX_STANDARD_TX_WEIGHT) {

rkrux

reACK 734076c

Ran make and functional tests, all successful.

@ismaelsadeeq This diff comparison b3ac117..734076c contains a lot of unrelated changes though.

ismaelsadeeq · 2024-07-07T11:28:45Z

@ismaelsadeeq This diff comparison b3ac117..734076c contains a lot of unrelated changes though.

Yes that's because of the recent rebase.

achow101 · 2024-07-17T22:19:21Z

ACK 734076c

DrahtBot added the Wallet label Mar 1, 2024

ismaelsadeeq mentioned this pull request Mar 1, 2024

Add max_tx_weight to transaction funding options #29264

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ismaelsadeeq marked this pull request as draft March 1, 2024 10:26

DrahtBot added the CI failed label Mar 1, 2024

This was referenced Mar 1, 2024

wallet: Target a pre-defined utxo set composition by adjusting change outputs #29442

Closed

Fix waste calculation in SelectionResult #28366

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ismaelsadeeq force-pushed the 02-2024-add-max-weight-to-tx-funding branch from babbc5c to 8e256fe Compare March 8, 2024 21:30

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ismaelsadeeq marked this pull request as ready for review March 9, 2024 06:41

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ismaelsadeeq force-pushed the 02-2024-add-max-weight-to-tx-funding branch from 53ee67d to 3a64b3a Compare April 4, 2024 10:51

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Multiprocess bitcoin #10102

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furszy mentioned this pull request Jun 19, 2024

wallet: notify when preset + automatic inputs exceed max weight #30309

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ismaelsadeeq force-pushed the 02-2024-add-max-weight-to-tx-funding branch 2 times, most recently from 1ae619f to a120fc7 Compare June 21, 2024 16:22

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refactor, wallet: get serialized size of CRecipients directly #30050

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ismaelsadeeq added 3 commits June 27, 2024 12:37

[doc]: update reason for deducting change output weight

baab0d2

`CoinGrinder` will also produce change output, listing all the Coin selection algorithms that produces change output is not maintainable, just infer that remaining algorithms all might produce change.

[wallet]: update the data type of change_output_size, `change_spend…

b6fc504

…_size` and `tx_noinputs_size` to `int` - This change ensures consistency in transaction size and weight calculation within the wallet and prevents conversion overflow when calculating `max_selection_weight`.

ismaelsadeeq force-pushed the 02-2024-add-max-weight-to-tx-funding branch from b3ac117 to d8febf6 Compare June 27, 2024 14:20

ismaelsadeeq force-pushed the 02-2024-add-max-weight-to-tx-funding branch from d8febf6 to 734076c Compare June 27, 2024 14:31

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achow101 merged commit efbf4e7 into bitcoin:master Jul 17, 2024

ismaelsadeeq deleted the 02-2024-add-max-weight-to-tx-funding branch July 17, 2024 23:30

xyephy mentioned this pull request Feb 26, 2025

Upgrade to bitcoin v28 whiveio/whive#12

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bitcoin locked and limited conversation to collaborators Jul 18, 2025

	if (coin_selection_params.m_max_tx_weight.value() < minimum_tx_weight \|\| coin_selection_params.m_max_tx_weight.value() > MAX_STANDARD_TX_WEIGHT) {
	if (coin_selection_params.m_max_tx_weight < minimum_tx_weight \|\| coin_selection_params.m_max_tx_weight > MAX_STANDARD_TX_WEIGHT) {

Wallet: Add max_tx_weight to transaction funding options (take 2) #29523

Wallet: Add max_tx_weight to transaction funding options (take 2) #29523

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Wallet: Add `max_tx_weight` to transaction funding options (take 2) #29523

Wallet: Add `max_tx_weight` to transaction funding options (take 2) #29523

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