forked from neo-project/neo
/
ProtocolHandler.cs
445 lines (411 loc) · 18.2 KB
/
ProtocolHandler.cs
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using Akka.Actor;
using Akka.Configuration;
using Neo.Cryptography;
using Neo.IO;
using Neo.IO.Actors;
using Neo.IO.Caching;
using Neo.Ledger;
using Neo.Network.P2P.Payloads;
using Neo.Persistence;
using Neo.Plugins;
using System;
using System.Collections;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Net;
namespace Neo.Network.P2P
{
internal class ProtocolHandler : UntypedActor
{
public class SetFilter { public BloomFilter Filter; }
internal class Timer { }
private class PendingKnownHashesCollection : KeyedCollection<UInt256, (UInt256, DateTime)>
{
protected override UInt256 GetKeyForItem((UInt256, DateTime) item)
{
return item.Item1;
}
}
private readonly NeoSystem system;
private readonly PendingKnownHashesCollection pendingKnownHashes;
private readonly HashSetCache<UInt256> knownHashes;
private readonly HashSetCache<UInt256> sentHashes;
private VersionPayload version;
private bool verack = false;
private BloomFilter bloom_filter;
private static readonly TimeSpan TimerInterval = TimeSpan.FromSeconds(30);
private static readonly TimeSpan PendingTimeout = TimeSpan.FromMinutes(1);
private readonly ICancelable timer = Context.System.Scheduler.ScheduleTellRepeatedlyCancelable(TimerInterval, TimerInterval, Context.Self, new Timer(), ActorRefs.NoSender);
public ProtocolHandler(NeoSystem system)
{
this.system = system;
this.pendingKnownHashes = new PendingKnownHashesCollection();
this.knownHashes = new HashSetCache<UInt256>(Blockchain.Singleton.MemPool.Capacity * 2 / 5);
this.sentHashes = new HashSetCache<UInt256>(Blockchain.Singleton.MemPool.Capacity * 2 / 5);
}
protected override void OnReceive(object message)
{
switch (message)
{
case Message msg:
OnMessage(msg);
break;
case Timer _:
OnTimer();
break;
}
}
private void OnMessage(Message msg)
{
foreach (IP2PPlugin plugin in Plugin.P2PPlugins)
if (!plugin.OnP2PMessage(msg))
return;
if (version == null)
{
if (msg.Command != MessageCommand.Version)
throw new ProtocolViolationException();
OnVersionMessageReceived((VersionPayload)msg.Payload);
return;
}
if (!verack)
{
if (msg.Command != MessageCommand.Verack)
throw new ProtocolViolationException();
OnVerackMessageReceived();
return;
}
switch (msg.Command)
{
case MessageCommand.Addr:
OnAddrMessageReceived((AddrPayload)msg.Payload);
break;
case MessageCommand.Block:
OnBlockReceived((Block)msg.Payload);
break;
case MessageCommand.Consensus:
OnInventoryReceived((ConsensusPayload)msg.Payload);
break;
case MessageCommand.FilterAdd:
OnFilterAddMessageReceived((FilterAddPayload)msg.Payload);
break;
case MessageCommand.FilterClear:
OnFilterClearMessageReceived();
break;
case MessageCommand.FilterLoad:
OnFilterLoadMessageReceived((FilterLoadPayload)msg.Payload);
break;
case MessageCommand.GetAddr:
OnGetAddrMessageReceived();
break;
case MessageCommand.GetBlocks:
OnGetBlocksMessageReceived((GetBlocksPayload)msg.Payload);
break;
case MessageCommand.GetBlockData:
OnGetBlockDataMessageReceived((GetBlockDataPayload)msg.Payload);
break;
case MessageCommand.GetData:
OnGetDataMessageReceived((InvPayload)msg.Payload);
break;
case MessageCommand.GetHeaders:
OnGetHeadersMessageReceived((GetHeadersPayload)msg.Payload);
break;
case MessageCommand.Headers:
OnHeadersMessageReceived((HeadersPayload)msg.Payload);
break;
case MessageCommand.Inv:
OnInvMessageReceived((InvPayload)msg.Payload);
break;
case MessageCommand.Mempool:
OnMemPoolMessageReceived();
break;
case MessageCommand.Ping:
OnPingMessageReceived((PingPayload)msg.Payload);
break;
case MessageCommand.Pong:
OnPongMessageReceived((PingPayload)msg.Payload);
break;
case MessageCommand.Transaction:
if (msg.Payload.Size <= Transaction.MaxTransactionSize)
OnInventoryReceived((Transaction)msg.Payload);
break;
case MessageCommand.Verack:
case MessageCommand.Version:
throw new ProtocolViolationException();
case MessageCommand.Alert:
case MessageCommand.MerkleBlock:
case MessageCommand.NotFound:
case MessageCommand.Reject:
default: break;
}
}
private void OnBlockReceived(Block payload)
{
if (payload != null)
system.SyncManager.Tell(payload, Context.Parent);
}
private void OnAddrMessageReceived(AddrPayload payload)
{
system.LocalNode.Tell(new Peer.Peers
{
EndPoints = payload.AddressList.Select(p => p.EndPoint).Where(p => p.Port > 0)
});
}
private void OnFilterAddMessageReceived(FilterAddPayload payload)
{
if (bloom_filter != null)
bloom_filter.Add(payload.Data);
}
private void OnFilterClearMessageReceived()
{
bloom_filter = null;
Context.Parent.Tell(new SetFilter { Filter = null });
}
private void OnFilterLoadMessageReceived(FilterLoadPayload payload)
{
bloom_filter = new BloomFilter(payload.Filter.Length * 8, payload.K, payload.Tweak, payload.Filter);
Context.Parent.Tell(new SetFilter { Filter = bloom_filter });
}
/// <summary>
/// Will be triggered when a MessageCommand.GetAddr message is received.
/// Randomly select nodes from the local RemoteNodes and tells to RemoteNode actors a MessageCommand.Addr message.
/// The message contains a list of networkAddresses from those selected random peers.
/// </summary>
private void OnGetAddrMessageReceived()
{
Random rand = new Random();
IEnumerable<RemoteNode> peers = LocalNode.Singleton.RemoteNodes.Values
.Where(p => p.ListenerTcpPort > 0)
.GroupBy(p => p.Remote.Address, (k, g) => g.First())
.OrderBy(p => rand.Next())
.Take(AddrPayload.MaxCountToSend);
NetworkAddressWithTime[] networkAddresses = peers.Select(p => NetworkAddressWithTime.Create(p.Listener.Address, p.Version.Timestamp, p.Version.Capabilities)).ToArray();
if (networkAddresses.Length == 0) return;
Context.Parent.Tell(Message.Create(MessageCommand.Addr, AddrPayload.Create(networkAddresses)));
}
/// <summary>
/// Will be triggered when a MessageCommand.GetBlocks message is received.
/// Tell the specified number of blocks' hashes starting with the requested HashStart until payload.Count or MaxHashesCount
/// Responses are sent to RemoteNode actor as MessageCommand.Inv Message.
/// </summary>
/// <param name="payload">A GetBlocksPayload including start block Hash and number of blocks requested.</param>
private void OnGetBlocksMessageReceived(GetBlocksPayload payload)
{
UInt256 hash = payload.HashStart;
// The default value of payload.Count is -1
int count = payload.Count < 0 || payload.Count > InvPayload.MaxHashesCount ? InvPayload.MaxHashesCount : payload.Count;
TrimmedBlock state = Blockchain.Singleton.View.Blocks.TryGet(hash);
if (state == null) return;
List<UInt256> hashes = new List<UInt256>();
for (uint i = 1; i <= count; i++)
{
uint index = state.Index + i;
if (index > Blockchain.Singleton.Height)
break;
hash = Blockchain.Singleton.GetBlockHash(index);
if (hash == null) break;
hashes.Add(hash);
}
if (hashes.Count == 0) return;
Context.Parent.Tell(Message.Create(MessageCommand.Inv, InvPayload.Create(InventoryType.Block, hashes.ToArray())));
}
private void OnGetBlockDataMessageReceived(GetBlockDataPayload payload)
{
for (uint i = payload.IndexStart, max = payload.IndexStart + payload.Count; i < max; i++)
{
Block block = Blockchain.Singleton.GetBlock(i);
if (block == null)
break;
if (bloom_filter == null)
{
Context.Parent.Tell(Message.Create(MessageCommand.Block, block));
}
else
{
BitArray flags = new BitArray(block.Transactions.Select(p => bloom_filter.Test(p)).ToArray());
Context.Parent.Tell(Message.Create(MessageCommand.MerkleBlock, MerkleBlockPayload.Create(block, flags)));
}
}
}
/// <summary>
/// Will be triggered when a MessageCommand.GetData message is received.
/// The payload includes an array of hash values.
/// For different payload.Type (Tx, Block, Consensus), get the corresponding (Txs, Blocks, Consensus) and tell them to RemoteNode actor.
/// </summary>
/// <param name="payload">The payload containing the requested information.</param>
private void OnGetDataMessageReceived(InvPayload payload)
{
UInt256[] hashes = payload.Hashes.Where(p => sentHashes.Add(p)).ToArray();
foreach (UInt256 hash in hashes)
{
switch (payload.Type)
{
case InventoryType.TX:
Transaction tx = Blockchain.Singleton.GetTransaction(hash);
if (tx != null)
Context.Parent.Tell(Message.Create(MessageCommand.Transaction, tx));
break;
case InventoryType.Block:
Block block = Blockchain.Singleton.GetBlock(hash);
if (block != null)
{
if (bloom_filter == null)
{
Context.Parent.Tell(Message.Create(MessageCommand.Block, block));
}
else
{
BitArray flags = new BitArray(block.Transactions.Select(p => bloom_filter.Test(p)).ToArray());
Context.Parent.Tell(Message.Create(MessageCommand.MerkleBlock, MerkleBlockPayload.Create(block, flags)));
}
}
break;
case InventoryType.Consensus:
if (Blockchain.Singleton.ConsensusRelayCache.TryGet(hash, out IInventory inventoryConsensus))
Context.Parent.Tell(Message.Create(MessageCommand.Consensus, inventoryConsensus));
break;
}
}
}
/// <summary>
/// Will be triggered when a MessageCommand.GetHeaders message is received.
/// Tell the specified number of blocks' headers starting with the requested IndexStart to RemoteNode actor.
/// A limit set by HeadersPayload.MaxHeadersCount is also applied to the number of requested Headers, namely payload.Count.
/// </summary>
/// <param name="payload">A GetBlocksPayload including start block index and number of blocks' headers requested.</param>
private void OnGetHeadersMessageReceived(GetHeadersPayload payload)
{
uint index = payload.IndexStart;
int count = payload.Count < 0 ? HeadersPayload.MaxHeadersCount : payload.Count;
if (index > Blockchain.Singleton.HeaderHeight)
return;
List<Header> headers = new List<Header>();
for (uint i = 0; i < count; i++)
{
var header = Blockchain.Singleton.GetHeader(index + i);
if (header == null) break;
headers.Add(header);
}
if (headers.Count == 0) return;
Context.Parent.Tell(Message.Create(MessageCommand.Headers, HeadersPayload.Create(headers.ToArray())));
}
private void OnHeadersMessageReceived(HeadersPayload payload)
{
if (payload.Headers.Length == 0) return;
system.Blockchain.Tell(payload.Headers, Context.Parent);
}
private void OnInventoryReceived(IInventory inventory)
{
system.TaskManager.Tell(new TaskManager.TaskCompleted { Hash = inventory.Hash }, Context.Parent);
system.LocalNode.Tell(new LocalNode.Relay { Inventory = inventory });
pendingKnownHashes.Remove(inventory.Hash);
knownHashes.Add(inventory.Hash);
}
private void OnInvMessageReceived(InvPayload payload)
{
UInt256[] hashes = payload.Hashes.Where(p => !pendingKnownHashes.Contains(p) && !knownHashes.Contains(p) && !sentHashes.Contains(p)).ToArray();
if (hashes.Length == 0) return;
switch (payload.Type)
{
case InventoryType.Block:
using (SnapshotView snapshot = Blockchain.Singleton.GetSnapshot())
hashes = hashes.Where(p => !snapshot.ContainsBlock(p)).ToArray();
break;
case InventoryType.TX:
using (SnapshotView snapshot = Blockchain.Singleton.GetSnapshot())
hashes = hashes.Where(p => !snapshot.ContainsTransaction(p)).ToArray();
break;
}
if (hashes.Length == 0) return;
foreach (UInt256 hash in hashes)
pendingKnownHashes.Add((hash, DateTime.UtcNow));
system.TaskManager.Tell(new TaskManager.NewTasks { Payload = InvPayload.Create(payload.Type, hashes) }, Context.Parent);
}
private void OnMemPoolMessageReceived()
{
foreach (InvPayload payload in InvPayload.CreateGroup(InventoryType.TX, Blockchain.Singleton.MemPool.GetVerifiedTransactions().Select(p => p.Hash).ToArray()))
Context.Parent.Tell(Message.Create(MessageCommand.Inv, payload));
}
private void OnPingMessageReceived(PingPayload payload)
{
Context.Parent.Tell(payload);
Context.Parent.Tell(Message.Create(MessageCommand.Pong, PingPayload.Create(Blockchain.Singleton.Height, payload.Nonce)));
}
private void OnPongMessageReceived(PingPayload payload)
{
Context.Parent.Tell(payload);
}
private void OnVerackMessageReceived()
{
verack = true;
Context.Parent.Tell(MessageCommand.Verack);
}
private void OnVersionMessageReceived(VersionPayload payload)
{
version = payload;
Context.Parent.Tell(payload);
}
private void OnTimer()
{
RefreshPendingKnownHashes();
}
protected override void PostStop()
{
timer.CancelIfNotNull();
base.PostStop();
}
private void RefreshPendingKnownHashes()
{
while (pendingKnownHashes.Count > 0)
{
var (_, time) = pendingKnownHashes[0];
if (DateTime.UtcNow - time <= PendingTimeout)
break;
pendingKnownHashes.RemoveAt(0);
}
}
public static Props Props(NeoSystem system)
{
return Akka.Actor.Props.Create(() => new ProtocolHandler(system)).WithMailbox("protocol-handler-mailbox");
}
}
internal class ProtocolHandlerMailbox : PriorityMailbox
{
public ProtocolHandlerMailbox(Settings settings, Config config)
: base(settings, config)
{
}
internal protected override bool IsHighPriority(object message)
{
if (!(message is Message msg)) return false;
switch (msg.Command)
{
case MessageCommand.Consensus:
case MessageCommand.FilterAdd:
case MessageCommand.FilterClear:
case MessageCommand.FilterLoad:
case MessageCommand.Verack:
case MessageCommand.Version:
case MessageCommand.Alert:
return true;
default:
return false;
}
}
internal protected override bool ShallDrop(object message, IEnumerable queue)
{
if (message is ProtocolHandler.Timer) return false;
if (!(message is Message msg)) return true;
switch (msg.Command)
{
case MessageCommand.GetAddr:
case MessageCommand.GetBlocks:
case MessageCommand.GetHeaders:
case MessageCommand.Mempool:
return queue.OfType<Message>().Any(p => p.Command == msg.Command);
default:
return false;
}
}
}
}