public void Synchronize()
{
Interlocked.Exchange(ref _running, 1);
Task.Run(async() =>
{
try
{
var blockCount = await RpcClient.GetBlockCountAsync();
var isIIB = true; // Initial Index Building phase
while (IsRunning)
{
try
{
// If stop was requested return.
if (IsRunning == false)
{
return;
}
Height height = StartingHeight;
uint256 prevHash = null;
using (await IndexLock.LockAsync())
{
if (Index.Count != 0)
{
var lastIndex = Index.Last();
height = lastIndex.BlockHeight + 1;
prevHash = lastIndex.BlockHash;
}
}
if (blockCount - height <= 100)
{
isIIB = false;
}
Block block = null;
try
{
block = await RpcClient.GetBlockAsync(height);
}
catch (RPCException) // if the block didn't come yet
{
await Task.Delay(1000);
continue;
}
if (blockCount - height <= 2)
{
NewBlock?.Invoke(this, block);
}
if (!(prevHash is null))
{
// In case of reorg:
if (prevHash != block.Header.HashPrevBlock && !isIIB) // There is no reorg in IIB
{
Logger.LogInfo <IndexBuilderService>($"REORG Invalid Block: {prevHash}");
// 1. Rollback index
using (await IndexLock.LockAsync())
{
Index.RemoveLast();
}
// 2. Serialize Index. (Remove last line.)
var lines = File.ReadAllLines(IndexFilePath);
File.WriteAllLines(IndexFilePath, lines.Take(lines.Length - 1).ToArray());
// 3. Rollback Bech32UtxoSet
if (Bech32UtxoSetHistory.Count != 0)
{
Bech32UtxoSetHistory.Last().Rollback(Bech32UtxoSet); // The Bech32UtxoSet MUST be recovered to its previous state.
Bech32UtxoSetHistory.RemoveLast();
// 4. Serialize Bech32UtxoSet.
await File.WriteAllLinesAsync(Bech32UtxoSetFilePath, Bech32UtxoSet
.Select(entry => entry.Key.Hash + ":" + entry.Key.N + ":" + ByteHelpers.ToHex(entry.Value.ToCompressedBytes())));
}
// 5. Skip the current block.
continue;
}
}
if (!isIIB)
{
if (Bech32UtxoSetHistory.Count >= 100)
{
Bech32UtxoSetHistory.RemoveFirst();
}
Bech32UtxoSetHistory.Add(new ActionHistoryHelper());
}
var scripts = new HashSet <Script>();
foreach (var tx in block.Transactions)
{
// If stop was requested return.
// Because this tx iteration can take even minutes
// It doesn't need to be accessed with a thread safe fasion with Interlocked through IsRunning, this may have some performance benefit
if (_running != 1)
{
return;
}
for (int i = 0; i < tx.Outputs.Count; i++)
{
var output = tx.Outputs[i];
if (!output.ScriptPubKey.IsPayToScriptHash && output.ScriptPubKey.IsWitness)
{
var outpoint = new OutPoint(tx.GetHash(), i);
Bech32UtxoSet.Add(outpoint, output.ScriptPubKey);
if (!isIIB)
{
Bech32UtxoSetHistory.Last().StoreAction(ActionHistoryHelper.Operation.Add, outpoint, output.ScriptPubKey);
}
scripts.Add(output.ScriptPubKey);
}
}
foreach (var input in tx.Inputs)
{
OutPoint prevOut = input.PrevOut;
if (Bech32UtxoSet.TryGetValue(prevOut, out Script foundScript))
{
Bech32UtxoSet.Remove(prevOut);
if (!isIIB)
{
Bech32UtxoSetHistory.Last().StoreAction(ActionHistoryHelper.Operation.Remove, prevOut, foundScript);
}
scripts.Add(foundScript);
}
}
}
GolombRiceFilter filter = null;
if (scripts.Count != 0)
{
filter = new GolombRiceFilterBuilder()
.SetKey(block.GetHash())
.SetP(20)
.SetM(1 << 20)
.AddEntries(scripts.Select(x => x.ToCompressedBytes()))
.Build();
}
var filterModel = new FilterModel
{
BlockHash = block.GetHash(),
BlockHeight = height,
Filter = filter
};
await File.AppendAllLinesAsync(IndexFilePath, new[] { filterModel.ToLine() });
using (await IndexLock.LockAsync())
{
Index.Add(filterModel);
}
if (File.Exists(Bech32UtxoSetFilePath))
{
File.Delete(Bech32UtxoSetFilePath);
}
await File.WriteAllLinesAsync(Bech32UtxoSetFilePath, Bech32UtxoSet
.Select(entry => entry.Key.Hash + ":" + entry.Key.N + ":" + ByteHelpers.ToHex(entry.Value.ToCompressedBytes())));
// If not close to the tip, just log debug.
// Use height.Value instead of simply height, because it cannot be negative height.
if (blockCount - height.Value <= 3 || height % 100 == 0)
{
Logger.LogInfo <IndexBuilderService>($"Created filter for block: {height}.");
}
else
{
Logger.LogDebug <IndexBuilderService>($"Created filter for block: {height}.");
}
}
catch (Exception ex)
{
Logger.LogDebug <IndexBuilderService>(ex);
}
}
}
finally
{
if (IsStopping)
{
Interlocked.Exchange(ref _running, 3);
}
}
});
}
public void Synchronize()
{
Task.Run(async () =>
{
try
{
if (Interlocked.Read(ref _runner) >= 2)
{
return;
}
Interlocked.Increment(ref _runner);
while (Interlocked.Read(ref _runner) != 1)
{
await Task.Delay(100);
}
if (Interlocked.Read(ref _running) >= 2)
{
return;
}
try
{
Interlocked.Exchange(ref _running, 1);
var isImmature = false; // The last 100 blocks are reorgable. (Assume it is mature at first.)
SyncInfo syncInfo = null;
while (IsRunning)
{
try
{
// If we did not yet initialized syncInfo, do so.
if (syncInfo is null)
{
syncInfo = await GetSyncInfoAsync();
}
uint heightToRequest = StartingHeight;
uint256 currentHash = null;
using (await IndexLock.LockAsync())
{
if (Index.Count != 0)
{
var lastIndex = Index.Last();
heightToRequest = lastIndex.Header.Height + 1;
currentHash = lastIndex.Header.BlockHash;
}
}
// If not synchronized or already 5 min passed since last update, get the latest blockchain info.
if (!syncInfo.IsCoreSynchornized || syncInfo.BlockchainInfoUpdated - DateTimeOffset.UtcNow > TimeSpan.FromMinutes(5))
{
syncInfo = await GetSyncInfoAsync();
}
if (syncInfo.BlockCount - heightToRequest <= 100)
{
// Both Wasabi and our Core node is in sync. Start doing stuff through P2P from now on.
if (syncInfo.IsCoreSynchornized && syncInfo.BlockCount == heightToRequest - 1)
{
syncInfo = await GetSyncInfoAsync();
// Double it to make sure not to accidentally miss any notification.
if (syncInfo.IsCoreSynchornized && syncInfo.BlockCount == heightToRequest - 1)
{
// Mark the process notstarted, so it can be started again and finally block can mark it is stopped.
Interlocked.Exchange(ref _running, 0);
return;
}
}
// Mark the synchronizing process is working with immature blocks from now on.
isImmature = true;
}
Block block = await RpcClient.GetBlockAsync(heightToRequest);
// Reorg check, except if we're requesting the starting height, because then the "currentHash" wouldn't exist.
if (heightToRequest != StartingHeight && currentHash != block.Header.HashPrevBlock)
{
// Reorg can happen only when immature. (If it'd not be immature, that'd be a huge issue.)
if (isImmature)
{
await ReorgOneAsync();
}
else
{
Logger.LogCritical("This is something serious! Over 100 block reorg is noticed! We cannot handle that!");
}
// Skip the current block.
continue;
}
if (isImmature)
{
PrepareBech32UtxoSetHistory();
}
var scripts = new HashSet<Script>();
foreach (var tx in block.Transactions)
{
// If stop was requested return.
// Because this tx iteration can take even minutes
// It does not need to be accessed with a thread safe fashion with Interlocked through IsRunning, this may have some performance benefit
if (_running != 1)
{
return;
}
for (int i = 0; i < tx.Outputs.Count; i++)
{
var output = tx.Outputs[i];
if (output.ScriptPubKey.IsScriptType(ScriptType.P2WPKH))
{
var outpoint = new OutPoint(tx.GetHash(), i);
var utxoEntry = new UtxoEntry(outpoint, output.ScriptPubKey);
Bech32UtxoSet.Add(outpoint, utxoEntry);
if (isImmature)
{
Bech32UtxoSetHistory.Last().StoreAction(Operation.Add, outpoint, output.ScriptPubKey);
}
scripts.Add(output.ScriptPubKey);
}
}
foreach (var input in tx.Inputs)
{
OutPoint prevOut = input.PrevOut;
if (Bech32UtxoSet.TryGetValue(prevOut, out UtxoEntry foundUtxoEntry))
{
var foundScript = foundUtxoEntry.Script;
Bech32UtxoSet.Remove(prevOut);
if (isImmature)
{
Bech32UtxoSetHistory.Last().StoreAction(Operation.Remove, prevOut, foundScript);
}
scripts.Add(foundScript);
}
}
}
GolombRiceFilter filter;
if (scripts.Any())
{
filter = new GolombRiceFilterBuilder()
.SetKey(block.GetHash())
.SetP(20)
.SetM(1 << 20)
.AddEntries(scripts.Select(x => x.ToCompressedBytes()))
.Build();
}
else
{
// We cannot have empty filters, because there was a bug in GolombRiceFilterBuilder that evaluates empty filters to true.
// And this must be fixed in a backwards compatible way, so we create a fake filter with a random scp instead.
filter = CreateDummyEmptyFilter(block.GetHash());
}
var smartHeader = new SmartHeader(block.GetHash(), block.Header.HashPrevBlock, heightToRequest, block.Header.BlockTime);
var filterModel = new FilterModel(smartHeader, filter);
await File.AppendAllLinesAsync(IndexFilePath, new[] { filterModel.ToLine() });
using (await IndexLock.LockAsync())
{
Index.Add(filterModel);
}
if (File.Exists(Bech32UtxoSetFilePath))
{
File.Delete(Bech32UtxoSetFilePath);
}
var bech32UtxoSetLines = Bech32UtxoSet.Select(entry => entry.Value.Line);
// Keep it sync unless you fix the performance issue with async.
File.WriteAllLines(Bech32UtxoSetFilePath, bech32UtxoSetLines);
// If not close to the tip, just log debug.
// Use height.Value instead of simply height, because it cannot be negative height.
if (syncInfo.BlockCount - heightToRequest <= 3 || heightToRequest % 100 == 0)
{
Logger.LogInfo($"Created filter for block: {heightToRequest}.");
}
else
{
Logger.LogDebug($"Created filter for block: {heightToRequest}.");
}
}
catch (Exception ex)
{
Logger.LogDebug(ex);
}
}
}
finally
{
Interlocked.CompareExchange(ref _running, 3, 2); // If IsStopping, make it stopped.
Interlocked.Decrement(ref _runner);
}
}
catch (Exception ex)
{
Logger.LogError($"Synchronization attempt failed to start: {ex}");
}
});
}
