coin select: add coin selection strategy option to all on-chain RPCs #8515

mohamedawnallah · 2024-03-03T08:57:54Z

Change Description

This PR adds coin selection strategy option to the following on-chain RPCs FundPsbt, SendOutputs, BatchOpenChannel, SendCoins, SendMany, EstimateFee and add coin_selection_strategy optional parameter to lncli equivalent commands (if any).

Fixes #8498

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Tests covering the positive and negative (error paths) are included.
Bug fixes contain tests triggering the bug to prevent regressions.

Code Style and Documentation

The change obeys the Code Documentation and Commenting guidelines, and lines wrap at 80.
Commits follow the Ideal Git Commit Structure.
Any new logging statements use an appropriate subsystem and logging level.
Any new lncli commands have appropriate tags in the comments for the rpc in the proto file.
There is a change description in the release notes, or [skip ci] in the commit message for small changes.

📝 Please see our Contribution Guidelines for further guidance.

coderabbitai · 2024-03-03T08:57:58Z

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cmd/lncli/cmd_open_channel.go

rpcserver.go

Chinwendu20

Nice PR, needs release doc. I think your changes to the protobuf go files can be in the same commit where you made corresponding change to the proto file. Might help fix lint.

guggero

Thanks for the PR! There's a lot of duplicated code in the CLI, see my inline comments on how that can be optimized.

cmd/lncli/cmd_open_channel.go

cmd/lncli/commands.go

lnrpc/lightning.proto

lnrpc/walletrpc/walletkit_server.go

lnrpc/marshall_utils.go

guggero · 2024-03-06T08:19:57Z

lnrpc/marshall_utils.go

+		)
+
+	case CoinSelectionStrategy_STRATEGY_LARGEST:
+		coinSelectionStrategy = wallet.CoinSelectionLargest


nit: can return directly in the case statements, then no final return at the end of the function is needed (since there's a default case).

funding/batch_test.go

lnrpc/lightning.proto

lnrpc/marshall_utils.go

guggero · 2024-03-07T08:31:24Z

@mohamedawnallah can you please apply the fixup commits and rebase?

lightninglabs-deploy · 2024-03-19T20:11:27Z

@guggero: review reminder
@ellemouton: review reminder
@mohamedawnallah, remember to re-request review from reviewers when ready

ellemouton

Looking good @mohamedawnallah !

Left some comments :)

ellemouton · 2024-03-13T10:24:11Z

lnrpc/marshall_utils.go

+
+// MapCoinSelectionStrategy maps a coin selection strategy string to
+// a wallet.CoinSelectionStrategy.
+func MapCoinSelectionStrategy(strategy string) (wallet.CoinSelectionStrategy,


i dont think we need this helper since we should only ever do this once.

lnrpc/lightning.proto

ellemouton · 2024-03-20T08:16:13Z

lnrpc/lightning.proto

+    // (lnd.conf).
+    STRATEGY_USE_GLOBAL_CONFIG = 0;
+
+    // Select the largest available coins first for spending.


suggest: "Select the largest available coins first during coin selection."

same below

ellemouton · 2024-03-20T08:18:01Z

config_builder.go

-	switch d.cfg.CoinSelectionStrategy {
-	case "largest":
-		walletConfig.CoinSelectionStrategy = wallet.CoinSelectionLargest
-
-	case "random":
-		walletConfig.CoinSelectionStrategy = wallet.CoinSelectionRandom
-
-	default:
-		return nil, nil, nil, fmt.Errorf("unknown coin selection "+
-			"strategy %v", d.cfg.CoinSelectionStrategy)
+	coinSelectionStrategy, err := lnrpc.MapCoinSelectionStrategy(
+		d.cfg.CoinSelectionStrategy,
+	)
+	if err != nil {
+		return nil, nil, nil, err
 	}
+	walletConfig.CoinSelectionStrategy = coinSelectionStrategy


I think we can leave this as is. We only want to do this conversion from config string to wallet.CoinSelectionStrategy once. It won't ever change. Then everywhere else where we need to know the global config, we can use this already parsed wallet.CoinSelectionStrategy value instead of re-parsing the string.

sp perhaps all that is needed here is to make the wallet.CoinSelectionStrategy strategy more easily accessible from the rpcserver level

ellemouton · 2024-03-20T08:19:26Z

lnrpc/lightning.proto

@@ -1145,6 +1162,10 @@ message SendManyRequest {

    // Whether unconfirmed outputs should be used as inputs for the transaction.
    bool spend_unconfirmed = 8;
+
+    // CoinSelectionStrategy is the strategy to use for selecting coins


This pattern of starting a comment with the name of the variable only applies to golang code btw. See the other examples here.

So this can just start with "The coin selection strategy to use ...."

same for other places here.

ellemouton · 2024-03-20T08:24:13Z

cmd/lncli/walletrpc_active.go

+			Usage: "(optional) the strategy to use for selecting " +
+				"coins to fund the PSBT from a template. " +
+				"If provided it will override the globally " +
+				"configured strategy in lnd.conf",


should mention which options are available.

Also, since this same flag is used in many places, might be worth extracting into a re-usable variable?

ellemouton · 2024-03-20T08:42:10Z

rpcserver.go

+	strategy, err := lnrpc.MapCoinSelectionStrategy(
+		r.cfg.CoinSelectionStrategy,
+	)
+	if err != nil {
+		return nil, err
+	}


should not need to parse it again here

ellemouton · 2024-03-20T08:43:09Z

rpcserver.go

 	feeRate chainfee.SatPerKWeight, minConfs int32,
-	label string) (*chainhash.Hash, error) {
+	label string,
+	strategy wallet.CoinSelectionStrategy) (*chainhash.Hash, error) {


nit: things can still fit on 3 lines instead of 4:

func (r *rpcServer) sendCoinsOnChain(paymentMap map[string]int64, feeRate chainfee.SatPerKWeight, minConfs int32, label string, strategy wallet.CoinSelectionStrategy) (*chainhash.Hash, error) {

ellemouton · 2024-03-20T08:44:16Z

lnwallet/btcwallet/btcwallet.go

 	feeRate chainfee.SatPerKWeight, minConfs int32,
-	label string) (*wire.MsgTx, error) {
+	label string,
+	strategy base.CoinSelectionStrategy) (*wire.MsgTx, error) {


func (b *BtcWallet) SendOutputs(outputs []*wire.TxOut, feeRate chainfee.SatPerKWeight, minConfs int32, label string, strategy base.CoinSelectionStrategy) (*wire.MsgTx, error) {

ellemouton · 2024-03-20T08:45:10Z

docs/release-notes/release-notes-0.18.0.md

+* Add coin selection strategy option to the following on-chain RPC calls
+  `EstimateFee`, `SendMany`, `SendCoins`, `BatchOpenChannel`, `SendOutputs`, and `FundPsbt`. [coin select: add coin selection strategy option to all on-chain RPCs](https://github.com/lightningnetwork/lnd/pull/8515).


notice that the other entries are wrapped at 80 chars :)

mohamedawnallah · 2024-03-20T22:47:52Z

Thank you very much, @ellemouton, for your feedback! The idea of converting the CoinSelectionStrategy string to wallet.CoinSelectionStrategy only once and making it accessible across rpcserver level simplified the code significantly. Thanks for suggesting this! I've addressed all of your feedback :)

mohamedawnallah · 2024-03-21T02:42:48Z

The latest change after asking for a review is related to the lining error solved by adding //nolint:funlen to fundPsbtCoinSelect:

lnrpc/walletrpc/walletkit_server.go:1474: Function 'fundPsbtCoinSelect' is too long (201 > 200) (funlen)

ellemouton

tACK (tested via the FundPSBT flow) 🚀

Great work! A few more suggestions 🙏

cmd/lncli/cmd_open_channel.go

ellemouton · 2024-03-22T08:07:47Z

cmd/lncli/commands.go

+	Name: "coin_selection_strategy",
+	Usage: "(optional) the strategy to use for selecting " +
+		"coins. If provided, it will override the " +
+		"globally configured strategy in lnd.conf",


this should contain a list of the available options

ellemouton

LGTM! 🚀 Great work!

guggero

Looks very good now! Just a couple of small requests, then we're good to go.

config.go

cmd/lncli/main.go

lnrpc/walletrpc/walletkit_server.go

rpcserver.go

docs/release-notes/release-notes-0.18.0.md

guggero

One last change required.

lnd.go

In this commit, we add the coin selection strategy option to all on-chain RPCs `FundPsbt`, `BatchOpenChannel`, `EstimateFee`, `SendMany`, `SendCoins`, `SendOutputs`.

In this commit we add coin selection strategy option to the following on-chain rpc commands `fundpsbt`, `fundtemplatepsbt`, `batchopenchannel`, `estimatefee`, `sendcoins`, and `sendmany`.

In this commit, we add the coin selection strategy option to the following on-chain RPCs `fundpsbt`, `batchopenchannel`, `estimatefee`, `sendcoins`, `sendmany`, and `sendoutputs`.

mohamedawnallah · 2024-04-01T17:18:12Z

The latest push after asking for a review is just rebasing!

guggero

Nice, LGTM 🎉

mohamedawnallah requested review from Roasbeef, yyforyongyu, Crypt-iQ, morehouse and ellemouton as code owners March 3, 2024 08:57

saubyk assigned mohamedawnallah Mar 3, 2024

saubyk added coin selection psbt rpc Related to the RPC interface lncli chain handling cli Related to the command line interface labels Mar 3, 2024

saubyk removed request for Roasbeef, yyforyongyu and Crypt-iQ March 3, 2024 19:08

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mohamedawnallah added 4 commits April 1, 2024 19:08

lnrpc+lnd+config: add coin selection strategy to all on-chain rpcs

7c2c0dc

In this commit, we add the coin selection strategy option to all on-chain RPCs `FundPsbt`, `BatchOpenChannel`, `EstimateFee`, `SendMany`, `SendCoins`, `SendOutputs`.

lncli: add coin selection strategy option to on-chain rpc commands

a0b0e7a

In this commit we add coin selection strategy option to the following on-chain rpc commands `fundpsbt`, `fundtemplatepsbt`, `batchopenchannel`, `estimatefee`, `sendcoins`, and `sendmany`.

multi: add coin selection strategy option to all on-chain rpcs

1a2d50d

In this commit, we add the coin selection strategy option to the following on-chain RPCs `fundpsbt`, `batchopenchannel`, `estimatefee`, `sendcoins`, `sendmany`, and `sendoutputs`.

docs: update the release-notes-0.18.0

31526a0

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guggero merged commit b117551 into lightningnetwork:master Apr 2, 2024
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lorenzolfm mentioned this pull request Apr 10, 2024

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coin select: add coin selection strategy option to all on-chain RPCs #8515

coin select: add coin selection strategy option to all on-chain RPCs #8515

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		* Add coin selection strategy option to the following on-chain RPC calls
		`EstimateFee`, `SendMany`, `SendCoins`, `BatchOpenChannel`, `SendOutputs`, and `FundPsbt`. [coin select: add coin selection strategy option to all on-chain RPCs](https://github.com/lightningnetwork/lnd/pull/8515).

coin select: add coin selection strategy option to all on-chain RPCs #8515

coin select: add coin selection strategy option to all on-chain RPCs #8515

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