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feat(spv): Electrum-style continuous updates with incremental parallel sync

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WalletSynchronizer now pipelines JSON-RPC requests (address subscribes,
histories, tx downloads and Merkle proofs run in parallel batches) and
keeps per-connection caches of downloaded transactions and verified
proofs, so notification-triggered resyncs only cost the delta.

The app connects automatically when a wallet opens, keeps one
synchronizer per connection, and queues notifications that arrive
during a sync instead of dropping them: incoming transactions now show
up within seconds.
This commit is contained in:
Davide Grilli
2026-06-11 13:37:31 +02:00
parent ece634f42e
commit 73a2d5356d
2 changed files with 118 additions and 61 deletions
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src/App/ViewModels/MainWindowViewModel.cs
+48 -23
View File
@@ -35,9 +35,13 @@ public partial class MainWindowViewModel : ViewModelBase
private string? _walletPath;
private string? _password;
private ElectrumClient? _client;
private WalletSynchronizer? _synchronizer;
private IReadOnlyDictionary<string, Transaction>? _lastTransactions;
private BuiltTransaction? _pendingSend;
/// <summary>Notifica arrivata durante una sync: si risincronizza appena finita.</summary>
private bool _resyncRequested;
/// <summary>File in attesa di password (apertura da menu File → Apri).</summary>
private string? _pendingOpenPath;
@@ -308,9 +312,10 @@ public partial class MainWindowViewModel : ViewModelBase
+ (doc.IsWatchOnly ? " · watch-only" : "");
ApplyCache(doc.Cache);
IsWalletOpen = true;
StatusMessage = doc.Cache is null
? "Wallet aperto. Connettiti a un server per sincronizzare."
: "Wallet aperto (dati dell'ultima sincronizzazione).";
StatusMessage = "Wallet aperto: connessione al server…";
// Come Electrum: ci si connette da soli al server selezionato,
// senza aspettare un click.
_ = ConnectAndSync();
}
private void ApplyCache(SyncCache? cache)
@@ -364,6 +369,11 @@ public partial class MainWindowViewModel : ViewModelBase
{
if (_account is null || _doc is null)
return;
if (IsSyncing)
{
_resyncRequested = true;
return;
}
IsSyncing = true;
StatusMessage = "";
try
@@ -383,28 +393,36 @@ public partial class MainWindowViewModel : ViewModelBase
IsConnected = true;
_autoReconnect = true;
ConnectionStatus = $"connesso a {host}:{port}{(UseSsl ? " (TLS)" : "")}";
// Synchronizer per connessione: conserva la cache di tx e
// prove verificate, così le risincronizzazioni sono incrementali.
_synchronizer = new WalletSynchronizer(_account, _client, _doc.GapLimit);
_synchronizer.Progress += msg => Dispatcher.UIThread.Post(() => StatusMessage = msg);
}
var sync = new WalletSynchronizer(_account, _client, _doc.GapLimit);
sync.Progress += msg => Dispatcher.UIThread.Post(() => StatusMessage = msg);
var result = await sync.SyncOnceAsync();
_lastTransactions = result.Transactions;
_doc.Cache = new SyncCache
// Se durante la sync arrivano notifiche, si ripete subito: nessun
// aggiornamento del server va perso (modello Electrum).
do
{
TipHeight = result.TipHeight,
ConfirmedSats = result.ConfirmedSats,
UnconfirmedSats = result.UnconfirmedSats,
NextReceiveIndex = result.NextReceiveIndex,
NextChangeIndex = result.NextChangeIndex,
History = [.. result.History],
Utxos = [.. result.Utxos],
Addresses = [.. result.AddressRows],
};
WalletStore.Save(_doc, _walletPath!, _password);
ApplyCache(_doc.Cache);
StatusMessage = $"Sincronizzato: altezza {result.TipHeight}, " +
$"{result.History.Count} transazioni verificate SPV.";
_resyncRequested = false;
var result = await _synchronizer!.SyncOnceAsync();
_lastTransactions = result.Transactions;
_doc.Cache = new SyncCache
{
TipHeight = result.TipHeight,
ConfirmedSats = result.ConfirmedSats,
UnconfirmedSats = result.UnconfirmedSats,
NextReceiveIndex = result.NextReceiveIndex,
NextChangeIndex = result.NextChangeIndex,
History = [.. result.History],
Utxos = [.. result.Utxos],
Addresses = [.. result.AddressRows],
};
WalletStore.Save(_doc, _walletPath!, _password);
ApplyCache(_doc.Cache);
StatusMessage = $"Sincronizzato: altezza {result.TipHeight}, " +
$"{result.History.Count} transazioni verificate SPV. Aggiornamento in tempo reale attivo.";
} while (_resyncRequested);
}
catch (CertificatePinMismatchException ex)
{
@@ -453,10 +471,14 @@ public partial class MainWindowViewModel : ViewModelBase
private void OnServerNotification(string method, System.Text.Json.JsonElement payload)
{
// Cambiamento su un nostro indirizzo o nuovo blocco: risincronizza.
// Se una sync è già in corso, si accoda (il loop in ConnectAndSync la
// ripete subito dopo): nessuna notifica viene persa.
if (method is "blockchain.scripthash.subscribe" or "blockchain.headers.subscribe")
Dispatcher.UIThread.Post(() =>
{
if (!IsSyncing)
if (IsSyncing)
_resyncRequested = true;
else
_ = ConnectAndSync();
});
}
@@ -541,6 +563,9 @@ public partial class MainWindowViewModel : ViewModelBase
{
_ = _client?.DisposeAsync().AsTask();
_client = null;
_synchronizer = null;
_autoReconnect = false;
_resyncRequested = false;
_doc = null;
_account = null;
_lastTransactions = null;