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Sync.cs
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Sync.cs
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// CypherNetwork by Matthew Hellyer is licensed under CC BY-NC-ND 4.0.
// To view a copy of this license, visit https://creativecommons.org/licenses/by-nc-nd/4.0
using System;
using System.Collections.Generic;
using System.Linq;
using System.Reactive.Linq;
using System.Threading;
using System.Threading.Tasks;
using CypherNetwork.Extensions;
using CypherNetwork.Models;
using CypherNetwork.Models.Messages;
using CypherNetwork.Network;
using Dawn;
using libsignal.util;
using MessagePack;
using Serilog;
using Spectre.Console;
using Block = CypherNetwork.Models.Block;
namespace CypherNetwork.Ledger;
/// <summary>
/// </summary>
public interface ISync
{
bool Running { get; }
}
/// <summary>
/// </summary>
public class Sync : ISync, IDisposable
{
private const int RetryCount = 6;
private readonly ICypherSystemCore _cypherSystemCore;
private readonly ILogger _logger;
private IDisposable _disposableInit;
private bool _disposed;
private int _running;
private static readonly object LockOnSync = new();
/// <summary>
/// </summary>
/// <param name="cypherSystemCore"></param>
/// <param name="logger"></param>
public Sync(ICypherSystemCore cypherSystemCore, ILogger logger)
{
_cypherSystemCore = cypherSystemCore;
_logger = logger.ForContext("SourceContext", nameof(Sync));
Init();
}
public bool Running => _running != 0;
/// <summary>
/// </summary>
private void Init()
{
_disposableInit = Observable.Timer(TimeSpan.Zero, TimeSpan.FromMinutes(_cypherSystemCore.Node.Network.AutoSyncEveryMinutes)).Subscribe(_ =>
{
if (_cypherSystemCore.ApplicationLifetime.ApplicationStopping.IsCancellationRequested) return;
try
{
if (Running) return;
_running = 1;
SynchronizeAsync().SafeFireAndForget(ex =>
{
_logger.Here().Error("{@Message}", ex.Message);
});
}
catch (TaskCanceledException)
{
// Ignore
}
});
}
/// <summary>
/// </summary>
/// <returns></returns>
private async Task SynchronizeAsync()
{
_logger.Information("Begin... [SYNCHRONIZATION]");
try
{
var blockCount = _cypherSystemCore.UnitOfWork().HashChainRepository.Count;
_logger.Information("OPENING block height [{@Height}]", blockCount);
var currentRetry = 0;
for (; ; )
{
if (_cypherSystemCore.ApplicationLifetime.ApplicationStopping.IsCancellationRequested) return;
var hasAny = await WaitForPeersAsync(currentRetry, RetryCount);
if (hasAny) break;
currentRetry++;
}
var peers = _cypherSystemCore.PeerDiscovery().GetDiscoveryStore().Where(x => x.BlockCount > blockCount).ToArray();
if (peers.Any() != true) return;
peers.Shuffle();
var maxBlockHeight = peers.Max(x => (long)x.BlockCount);
var chunk = maxBlockHeight / peers.Length;
_logger.Information("Peer count [{@PeerCount}]", peers.Length);
_logger.Information("Network block height [{@MaxBlockHeight}]", maxBlockHeight);
foreach (var peer in peers)
{
var skip = blockCount <= 6 ? blockCount : blockCount - 6; // +- Depth of blocks to compare.
var take = (int)((int)blockCount + chunk);
if (take > (int)maxBlockHeight)
{
take = (int)(maxBlockHeight - (long)blockCount) + (int)blockCount;
}
SynchronizeAsync(peer, skip, take).Wait();
blockCount = _cypherSystemCore.UnitOfWork().HashChainRepository.Count;
_logger.Information("Local block height ({@LocalHeight})", blockCount);
if (blockCount == (ulong)maxBlockHeight) break;
}
}
catch (Exception ex)
{
_logger.Here().Error(ex, "Error while checking");
}
finally
{
Interlocked.Exchange(ref _running, 0);
var blockCount = _cypherSystemCore.UnitOfWork().HashChainRepository.Count;
_logger.Information("LOCAL NODE block height: [{@LocalHeight}]", blockCount);
_logger.Information("End... [SYNCHRONIZATION]");
_logger.Information("Next...[SYNCHRONIZATION] in {@Message} minute(s)",
_cypherSystemCore.Node.Network.AutoSyncEveryMinutes);
}
}
/// <summary>
/// </summary>
/// <param name="currentRetry"></param>
/// <param name="retryCount"></param>
/// <returns></returns>
private async Task<bool> WaitForPeersAsync(int currentRetry, int retryCount)
{
Guard.Argument(currentRetry, nameof(currentRetry)).NotNegative();
Guard.Argument(retryCount, nameof(retryCount)).NotNegative();
var jitter = new Random();
var discovery = _cypherSystemCore.PeerDiscovery();
if (discovery.Count() != 0) return true;
if (currentRetry >= retryCount || discovery.Count() != 0) return true;
var retryDelay = TimeSpan.FromSeconds(Math.Pow(2, currentRetry)) +
TimeSpan.FromMilliseconds(jitter.Next(0, 1000));
_logger.Warning("Waiting for peers... [RETRYING] in {@Sec}s", retryDelay.Seconds);
await Task.Delay(retryDelay);
return false;
}
/// <summary>
/// </summary>
/// <param name="peer"></param>
/// <param name="skip"></param>
/// <param name="take"></param>
/// <returns></returns>
private async Task SynchronizeAsync(Peer peer, ulong skip, int take)
{
Guard.Argument(peer, nameof(peer)).HasValue();
Guard.Argument(skip, nameof(skip)).NotNegative();
Guard.Argument(take, nameof(take)).NotNegative();
var isSynchronized = false;
try
{
var validator = _cypherSystemCore.Validator();
var blocks = await FetchBlocksAsync(peer, skip, take);
if (blocks?.Any() != true) return;
if (skip == 0)
{
_logger.Warning("FIRST TIME BOOTSTRAPPING");
}
else
{
_logger.Information("CONTINUE BOOTSTRAPPING");
_logger.Information("CHECKING [BLOCK DUPLICATES]");
var verifyNoDuplicateBlockHeights = validator.VerifyNoDuplicateBlockHeights(blocks);
if (verifyNoDuplicateBlockHeights == VerifyResult.AlreadyExists)
{
_cypherSystemCore.PeerDiscovery().SetPeerCooldown(new PeerCooldown
{
IpAddress = peer.IpAddress,
PublicKey = peer.PublicKey,
ClientId = peer.ClientId,
PeerState = PeerState.DupBlocks
});
_logger.Warning("DUPLICATE block height [UNABLE TO VERIFY]");
return;
}
_logger.Information("CHECKING [FORK RULE]");
var forkRuleBlocks = await validator.VerifyForkRuleAsync(blocks.OrderBy(x => x.Height).ToArray());
if (forkRuleBlocks.Length == 0)
{
_logger.Fatal("FORK RULE CHECK [UNABLE TO VERIFY]");
return;
}
blocks = forkRuleBlocks.ToList();
_logger.Information("FORK RULE CHECK [OK]");
}
await AnsiConsole.Progress().AutoClear(false).Columns(new TaskDescriptionColumn(), new ProgressBarColumn(),
new PercentageColumn(), new SpinnerColumn()).StartAsync(async ctx =>
{
var warpTask = ctx.AddTask($"[bold green]SYNCHRONIZING[/] [bold yellow]{blocks.Count}[/] Block(s)", false).IsIndeterminate();
warpTask.MaxValue(blocks.Count);
warpTask.StartTask();
warpTask.IsIndeterminate(false);
while (!ctx.IsFinished)
foreach (var block in blocks.OrderBy(x => x.Height))
try
{
var verifyBlockHeader = await validator.VerifyBlockAsync(block);
if (verifyBlockHeader != VerifyResult.Succeed)
{
warpTask.StopTask();
return;
}
var saveBlockResponse =
await _cypherSystemCore.Graph().SaveBlockAsync(new SaveBlockRequest(block));
if (saveBlockResponse.Ok)
{
await Task.Delay(1);
warpTask.Increment(1);
continue;
}
warpTask.StopTask();
AnsiConsole.MarkupLine("[red]LOG:[/] " + $"Unable to save block: {block.Hash}" + "[red]...[/]");
return;
}
catch (Exception ex)
{
warpTask.StopTask();
_logger.Here().Error(ex, "Unable to save block: {@Hash}", block.Hash.ByteToHex());
return;
}
});
}
catch (Exception ex)
{
_logger.Here().Error(ex, "SYNCHRONIZATION [FAILED]");
}
}
/// <summary>
/// </summary>
/// <param name="peer"></param>
/// <param name="skip"></param>
/// <param name="take"></param>
/// <returns></returns>
private async Task<IReadOnlyList<Block>> FetchBlocksAsync(Peer peer, ulong skip, int take)
{
Guard.Argument(peer, nameof(peer)).HasValue();
Guard.Argument(skip, nameof(skip)).NotNegative();
Guard.Argument(take, nameof(take)).NotNegative();
var iSkip = skip;
try
{
const int maxBlocks = 10;
var iTake = take - (int)skip;
var chunks = Enumerable.Repeat(maxBlocks, iTake / maxBlocks).ToList();
if (iTake % maxBlocks != 0) chunks.Add(iTake % maxBlocks);
// Show progress
var blocks = await AnsiConsole.Progress().AutoClear(false).Columns(new TaskDescriptionColumn(),
new ProgressBarColumn(), new PercentageColumn(), new SpinnerColumn())
.StartAsync(async ctx =>
{
var blocks = new List<Block>();
var warpTask = ctx.AddTask($"[bold green]DOWNLOADING[/] [bold yellow]{Math.Abs(take - (int)skip)}[/] block(s) from [bold yellow]{peer.Name.FromBytes()}[/] v{peer.Version.FromBytes()}", false).IsIndeterminate();
warpTask.MaxValue(take - (int)skip);
warpTask.StartTask();
warpTask.IsIndeterminate(false);
while (!ctx.IsFinished)
foreach (var chunk in chunks)
{
var blocksResponse = await _cypherSystemCore.P2PDeviceReq().SendAsync<BlocksResponse>(
peer.IpAddress, peer.TcpPort, peer.PublicKey,
MessagePackSerializer.Serialize(new Parameter[]
{
new() { Value = iSkip.ToBytes(), ProtocolCommand = ProtocolCommand.GetBlocks },
new() { Value = chunk.ToBytes(), ProtocolCommand = ProtocolCommand.GetBlocks }
}), 500);
if (blocksResponse?.Blocks is null)
{
warpTask.StopTask();
break;
}
blocks.AddRange(blocksResponse.Blocks);
iSkip += (ulong)chunk;
await Task.Delay(100);
warpTask.Increment(chunk);
}
return blocks;
});
return blocks;
}
catch (Exception ex)
{
_logger.Here().Error("{@Message}", ex.Message);
}
return null;
}
/// <summary>
///
/// </summary>
/// <param name="disposing"></param>
private void Dispose(bool disposing)
{
if (_disposed)
{
return;
}
if (disposing)
{
_disposableInit?.Dispose();
}
_disposed = true;
}
/// <summary>
///
/// </summary>
public void Dispose()
{
Dispose(true);
GC.SuppressFinalize(this);
}
}