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Merge remote-tracking branch 'origin/dart-examples-lsp-fiat-fee' into python-examples

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ruben beck
2023-07-11 20:12:36 +02:00
parent f74705f627 39682c55e4
commit 1ad000c0d1
1 changed files with 32 additions and 15 deletions
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src/guide/receive_onchain.md
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@@ -290,26 +290,43 @@ result, err := sdkServices.Refund(refundable.BitcoinAddress, destinationAddress,
<div slot="title">Dart</div> <div slot="title">Dart</div>
<section> <section>
To calculate fees, you'll need to detect if channel opening fees are needed first and then calculate the fee for the amount you'll be receiving.
```dart ```dart
int calculateChannelOpeningFee(int amountSats) { int calculateChannelOpeningFee(int amountSats) async {
bool isChannelOpeningFeeNeeded = await isChannelOpeningFeeNeeded(amountSats);
return isChannelOpeningFeeNeeded ? calculateFeesForAmount(amountSats) : 0;
}
```
How to detect if open channel fees are needed.
```dart
bool isChannelOpeningFeeNeeded(int amountSats) async {
NodeState? nodeState = await getNodeState(); NodeState? nodeState = await getNodeState();
int liquidity = nodeState.inboundLiquidityMsats ~/ 1000; int liquidity = nodeState.inboundLiquidityMsats ~/ 1000;
// Check if we need to open channel // Check if we need to open channel
if(amountSats >= liquidity) { return amountSats >= liquidity;
// We need to open channel so we are calculating the fees for the LSP }
String? lspId = await getLspId(); ```
LSPInformation? lspInformation = await fetchLspInfo(lspId!);
// setupFee is the proportional fee charged based on the amount
int setupFee = (lspInformation.channelFeePermyriad / 100);
// minFee is the minimum fee required by the LSP to open a channeş
int minFee = lspInfo.channelMinimumFeeMsat ~/ 1000;
// A setup fee of {setupFee}% with a minimum of {minFee} will be applied for sending more than {liquidity}.
int channelFeesMsat = (amountSats * setupFee ~/ 100); How to calculate the fee for a specific amount.
// If the proportional fee is smaller than minimum fees, minimum fees is selected.
return max(channelFeesMsat, minFee); ```dart
} int calculateFeesForAmount(int amountSats) async {
// We need to open channel so we are calculating the fees for the LSP
String? lspId = await getLspId();
LSPInformation? lspInformation = await fetchLspInfo(lspId!);
// setupFee is the proportional fee charged based on the amount
int setupFee = (lspInformation.channelFeePermyriad / 100);
// minFee is the minimum fee required by the LSP to open a channeş
int minFee = lspInfo.channelMinimumFeeMsat ~/ 1000;
// A setup fee of {setupFee}% with a minimum of {minFee} will be applied for sending more than {liquidity}.
int channelFeesMsat = (amountSats * setupFee ~/ 100);
// If the proportional fee is smaller than minimum fees, minimum fees is selected.
return max(channelFeesMsat, minFee);
} }
``` ```
</section> </section>