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https://github.com/btcpayserver/btcpayserver.git
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641bdcff31
* Histograms: Add Lightning data and API endpoints Ported over from the mobile-working-branch. Adds histogram data for Lightning and exposes the wallet/lightning histogram data via the API. It also add a dashboard graph for the Lightning balance. Caveat: The Lightning histogram is calculated by using the current channel balance and going backwards through as much invoices and transactions as we have. The "start" of the LN graph data might not be accurate though. That's because we don't track (and not even have) the LN onchain data. It is calculated by using the current channel balance and going backwards through as much invoices and transactions as we have. So the historic graph data for LN is basically a best effort of trying to reconstruct it with what we have: The LN channel transactions. * More timeframes * Refactoring: Remove redundant WalletHistogram types * Remove store property from dashboard tile view models * JS error fixes
83 lines
3.3 KiB
C#
83 lines
3.3 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Threading;
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using System.Threading.Tasks;
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using BTCPayServer.Client.Models;
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using BTCPayServer.Lightning;
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namespace BTCPayServer.Services;
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public class LightningHistogramService
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{
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public async Task<HistogramData> GetHistogram(ILightningClient lightningClient, HistogramType type, CancellationToken cancellationToken)
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{
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var (days, pointCount) = type switch
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{
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HistogramType.Day => (1, 30),
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HistogramType.Week => (7, 30),
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HistogramType.Month => (30, 30),
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HistogramType.YTD => (DateTimeOffset.Now.DayOfYear - 1, 30),
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HistogramType.Year => (365, 30),
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HistogramType.TwoYears => (730, 30),
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_ => throw new ArgumentException($"HistogramType {type} does not exist.")
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};
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var to = DateTimeOffset.UtcNow;
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var from = to - TimeSpan.FromDays(days);
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var ticks = (to - from).Ticks;
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var interval = TimeSpan.FromTicks(ticks / pointCount);
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try
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{
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// general balance
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var lnBalance = await lightningClient.GetBalance(cancellationToken);
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var total = lnBalance.OffchainBalance.Local;
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var totalBtc = total.ToDecimal(LightMoneyUnit.BTC);
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// prepare transaction data
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var lnInvoices = await lightningClient.ListInvoices(cancellationToken);
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var lnPayments = await lightningClient.ListPayments(cancellationToken);
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var lnTransactions = lnInvoices
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.Where(inv => inv.Status == LightningInvoiceStatus.Paid && inv.PaidAt >= from)
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.Select(inv => new LnTx { Amount = inv.Amount.ToDecimal(LightMoneyUnit.BTC), Settled = inv.PaidAt.GetValueOrDefault() })
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.Concat(lnPayments
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.Where(pay => pay.Status == LightningPaymentStatus.Complete && pay.CreatedAt >= from)
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.Select(pay => new LnTx { Amount = pay.Amount.ToDecimal(LightMoneyUnit.BTC) * -1, Settled = pay.CreatedAt.GetValueOrDefault() }))
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.OrderByDescending(tx => tx.Settled)
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.ToList();
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// assemble graph data going backwards
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var series = new List<decimal>(pointCount);
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var labels = new List<DateTimeOffset>(pointCount);
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var balance = totalBtc;
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for (var i = pointCount; i > 0; i--)
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{
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var txs = lnTransactions.Where(t =>
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t.Settled.Ticks >= from.Ticks + interval.Ticks * i &&
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t.Settled.Ticks < from.Ticks + interval.Ticks * (i + 1));
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var sum = txs.Sum(tx => tx.Amount);
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balance -= sum;
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series.Add(balance);
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labels.Add(from + interval * (i - 1));
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}
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// reverse the lists
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series.Reverse();
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labels.Reverse();
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return new HistogramData
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{
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Type = type,
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Balance = totalBtc,
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Series = series,
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Labels = labels
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};
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}
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catch (Exception)
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{
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return null;
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}
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}
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private class LnTx
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{
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public DateTimeOffset Settled { get; set; }
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public decimal Amount { get; set; }
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}
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}
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