forked from neo-project/neo
/
ProtocolHandler.cs
349 lines (325 loc) · 13.4 KB
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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.Linq;
using System.Net;
namespace Neo.Network.P2P
{
internal class ProtocolHandler : UntypedActor
{
public class SetFilter { public BloomFilter Filter; }
private readonly NeoSystem system;
private readonly FIFOSet<UInt256> knownHashes;
private readonly FIFOSet<UInt256> sentHashes;
private VersionPayload version;
private bool verack = false;
private BloomFilter bloom_filter;
public ProtocolHandler(NeoSystem system)
{
this.system = system;
this.knownHashes = new FIFOSet<UInt256>(Blockchain.Singleton.MemPool.Capacity * 2);
this.sentHashes = new FIFOSet<UInt256>(Blockchain.Singleton.MemPool.Capacity * 2);
}
protected override void OnReceive(object message)
{
if (!(message is Message msg)) return;
foreach (IP2PPlugin plugin in Plugin.P2PPlugins)
if (!plugin.OnP2PMessage(msg))
return;
if (version == null)
{
if (msg.Command != "version")
throw new ProtocolViolationException();
OnVersionMessageReceived(msg.GetPayload<VersionPayload>());
return;
}
if (!verack)
{
if (msg.Command != "verack")
throw new ProtocolViolationException();
OnVerackMessageReceived();
return;
}
switch (msg.Command)
{
case "addr":
OnAddrMessageReceived(msg.GetPayload<AddrPayload>());
break;
case "block":
OnInventoryReceived(msg.GetPayload<Block>());
break;
case "consensus":
OnInventoryReceived(msg.GetPayload<ConsensusPayload>());
break;
case "filteradd":
OnFilterAddMessageReceived(msg.GetPayload<FilterAddPayload>());
break;
case "filterclear":
OnFilterClearMessageReceived();
break;
case "filterload":
OnFilterLoadMessageReceived(msg.GetPayload<FilterLoadPayload>());
break;
case "getaddr":
OnGetAddrMessageReceived();
break;
case "getblocks":
OnGetBlocksMessageReceived(msg.GetPayload<GetBlocksPayload>());
break;
case "getdata":
OnGetDataMessageReceived(msg.GetPayload<InvPayload>());
break;
case "getheaders":
OnGetHeadersMessageReceived(msg.GetPayload<GetBlocksPayload>());
break;
case "headers":
OnHeadersMessageReceived(msg.GetPayload<HeadersPayload>());
break;
case "inv":
OnInvMessageReceived(msg.GetPayload<InvPayload>());
break;
case "mempool":
OnMemPoolMessageReceived();
break;
case "ping":
OnPingMessageReceived(msg.GetPayload<PingPayload>());
break;
case "pong":
OnPongMessageReceived(msg.GetPayload<PingPayload>());
break;
case "tx":
if (msg.Payload.Length <= Transaction.MaxTransactionSize)
OnInventoryReceived(msg.GetTransaction());
break;
case "verack":
case "version":
throw new ProtocolViolationException();
case "alert":
case "merkleblock":
case "notfound":
case "reject":
default:
//暂时忽略
break;
}
}
private void OnAddrMessageReceived(AddrPayload payload)
{
system.LocalNode.Tell(new Peer.Peers
{
EndPoints = payload.AddressList.Select(p => p.EndPoint)
});
}
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 });
}
private void OnGetAddrMessageReceived()
{
Random rand = new Random();
IEnumerable<RemoteNode> peers = LocalNode.Singleton.RemoteNodes.Values
.Where(p => p.ListenerPort > 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, p.Version.Services, p.Version.Timestamp)).ToArray();
if (networkAddresses.Length == 0) return;
Context.Parent.Tell(Message.Create("addr", AddrPayload.Create(networkAddresses)));
}
private void OnGetBlocksMessageReceived(GetBlocksPayload payload)
{
UInt256 hash = payload.HashStart[0];
if (hash == payload.HashStop) return;
BlockState state = Blockchain.Singleton.Store.GetBlocks().TryGet(hash);
if (state == null) return;
List<UInt256> hashes = new List<UInt256>();
for (uint i = 1; i <= InvPayload.MaxHashesCount; i++)
{
uint index = state.TrimmedBlock.Index + i;
if (index > Blockchain.Singleton.Height)
break;
hash = Blockchain.Singleton.GetBlockHash(index);
if (hash == null) break;
if (hash == payload.HashStop) break;
hashes.Add(hash);
}
if (hashes.Count == 0) return;
Context.Parent.Tell(Message.Create("inv", InvPayload.Create(InventoryType.Block, hashes.ToArray())));
}
private void OnGetDataMessageReceived(InvPayload payload)
{
UInt256[] hashes = payload.Hashes.Where(p => sentHashes.Add(p)).ToArray();
foreach (UInt256 hash in hashes)
{
Blockchain.Singleton.RelayCache.TryGet(hash, out IInventory inventory);
switch (payload.Type)
{
case InventoryType.TX:
if (inventory == null)
inventory = Blockchain.Singleton.GetTransaction(hash);
if (inventory is Transaction)
Context.Parent.Tell(Message.Create("tx", inventory));
break;
case InventoryType.Block:
if (inventory == null)
inventory = Blockchain.Singleton.GetBlock(hash);
if (inventory is Block block)
{
if (bloom_filter == null)
{
Context.Parent.Tell(Message.Create("block", inventory));
}
else
{
BitArray flags = new BitArray(block.Transactions.Select(p => bloom_filter.Test(p)).ToArray());
Context.Parent.Tell(Message.Create("merkleblock", MerkleBlockPayload.Create(block, flags)));
}
}
break;
case InventoryType.Consensus:
if (inventory != null)
Context.Parent.Tell(Message.Create("consensus", inventory));
break;
}
}
}
private void OnGetHeadersMessageReceived(GetBlocksPayload payload)
{
UInt256 hash = payload.HashStart[0];
if (hash == payload.HashStop) return;
DataCache<UInt256, BlockState> cache = Blockchain.Singleton.Store.GetBlocks();
BlockState state = cache.TryGet(hash);
if (state == null) return;
List<Header> headers = new List<Header>();
for (uint i = 1; i <= HeadersPayload.MaxHeadersCount; i++)
{
uint index = state.TrimmedBlock.Index + i;
hash = Blockchain.Singleton.GetBlockHash(index);
if (hash == null) break;
if (hash == payload.HashStop) break;
Header header = cache.TryGet(hash)?.TrimmedBlock.Header;
if (header == null) break;
headers.Add(header);
}
if (headers.Count == 0) return;
Context.Parent.Tell(Message.Create("headers", HeadersPayload.Create(headers)));
}
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);
if (inventory is MinerTransaction) return;
system.LocalNode.Tell(new LocalNode.Relay { Inventory = inventory });
}
private void OnInvMessageReceived(InvPayload payload)
{
UInt256[] hashes = payload.Hashes.Where(p => knownHashes.Add(p)).ToArray();
if (hashes.Length == 0) return;
switch (payload.Type)
{
case InventoryType.Block:
using (Snapshot snapshot = Blockchain.Singleton.GetSnapshot())
hashes = hashes.Where(p => !snapshot.ContainsBlock(p)).ToArray();
break;
case InventoryType.TX:
using (Snapshot snapshot = Blockchain.Singleton.GetSnapshot())
hashes = hashes.Where(p => !snapshot.ContainsTransaction(p)).ToArray();
break;
}
if (hashes.Length == 0) return;
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("inv", payload));
}
private void OnPingMessageReceived(PingPayload payload)
{
Context.Parent.Tell(payload);
Context.Parent.Tell(Message.Create("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("verack");
}
private void OnVersionMessageReceived(VersionPayload payload)
{
version = payload;
Context.Parent.Tell(payload);
}
public static Props Props(NeoSystem system)
{
return Akka.Actor.Props.Create(() => new ProtocolHandler(system)).WithMailbox("protocol-handler-mailbox");
}
}
internal class ProtocolHandlerMailbox : PriorityMailbox
{
public ProtocolHandlerMailbox(Akka.Actor.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 "consensus":
case "filteradd":
case "filterclear":
case "filterload":
case "verack":
case "version":
case "alert":
return true;
default:
return false;
}
}
internal protected override bool ShallDrop(object message, IEnumerable queue)
{
if (!(message is Message msg)) return true;
switch (msg.Command)
{
case "getaddr":
case "getblocks":
case "getdata":
case "getheaders":
case "mempool":
return queue.OfType<Message>().Any(p => p.Command == msg.Command);
default:
return false;
}
}
}
}