github.com/neatio-net/neatio@v1.7.3-0.20231114194659-f4d7a2226baa/neatptc/peer.go

package neatptc

import (
	"errors"
	"fmt"
	"math/big"
	"sync"
	"time"

	"github.com/neatio-net/neatio/chain/consensus"
	"github.com/neatio-net/wire-go"

	"github.com/neatio-net/neatio/chain/core/types"
	"github.com/neatio-net/neatio/network/p2p"
	"github.com/neatio-net/neatio/utilities/common"
	"github.com/neatio-net/neatio/utilities/rlp"
	"github.com/neatio-net/set-go"
)

var (
	errClosed            = errors.New("peer set is closed")
	errAlreadyRegistered = errors.New("peer is already registered")
	errNotRegistered     = errors.New("peer is not registered")
)

const (
	maxKnownTxs          = 32768
	maxKnownBlocks       = 1024
	maxKnownTX3ProofData = 32768
	handshakeTimeout     = 5 * time.Second
)

type PeerInfo struct {
	Version    int      `json:"version"`
	Difficulty *big.Int `json:"difficulty"`
	Head       string   `json:"head"`
}

type peer struct {
	id                string
	consensus_pub_key string

	*p2p.Peer
	rw p2p.MsgReadWriter

	pname    string
	version  int
	forkDrop *time.Timer

	head common.Hash
	td   *big.Int
	lock sync.RWMutex

	knownTxs           *set.Set
	knownBlocks        *set.Set
	knownTX3ProofDatas *set.Set

	peerState consensus.PeerState
}

func newPeer(version int, p *p2p.Peer, rw p2p.MsgReadWriter) *peer {
	id := p.ID()

	return &peer{
		Peer: p,
		rw:   rw,

		version:            version,
		id:                 fmt.Sprintf("%x", id[:8]),
		knownTxs:           set.New(),
		knownBlocks:        set.New(),
		knownTX3ProofDatas: set.New(),
	}
}

func (p *peer) Info() *PeerInfo {
	hash, td := p.Head()

	return &PeerInfo{
		Version:    p.version,
		Difficulty: td,
		Head:       hash.Hex(),
	}
}

func (p *peer) GetConsensusKey() string {
	return p.consensus_pub_key
}

func (p *peer) Head() (hash common.Hash, td *big.Int) {
	p.lock.RLock()
	defer p.lock.RUnlock()

	copy(hash[:], p.head[:])
	return hash, new(big.Int).Set(p.td)
}

func (p *peer) SetHead(hash common.Hash, td *big.Int) {
	p.lock.Lock()
	defer p.lock.Unlock()

	copy(p.head[:], hash[:])
	p.td.Set(td)
}

func (p *peer) MarkBlock(hash common.Hash) {

	for p.knownBlocks.Size() >= maxKnownBlocks {
		p.knownBlocks.Pop()
	}
	p.knownBlocks.Add(hash)
}

func (p *peer) MarkTransaction(hash common.Hash) {

	for p.knownTxs.Size() >= maxKnownTxs {
		p.knownTxs.Pop()
	}
	p.knownTxs.Add(hash)
}

func (p *peer) MarkTX3ProofData(hash common.Hash) {

	for p.knownTX3ProofDatas.Size() >= maxKnownTX3ProofData {
		p.knownTX3ProofDatas.Pop()
	}
	p.knownTX3ProofDatas.Add(hash)
}

func (p *peer) Send(msgcode uint64, data interface{}) error {
	if msgcode >= 0x20 && msgcode <= 0x23 {
		wirebytes := wire.BinaryBytes(data)
		return p2p.Send(p.rw, msgcode, wirebytes)
	} else {
		return p2p.Send(p.rw, msgcode, data)
	}

}

func (p *peer) GetPeerState() consensus.PeerState {
	return p.peerState
}

func (p *peer) GetKey() string {
	return p.id
}

func (p *peer) SetPeerState(ps consensus.PeerState) {
	p.peerState = ps
}

func (p *peer) SendTransactions(txs types.Transactions) error {
	for _, tx := range txs {
		p.knownTxs.Add(tx.Hash())
	}
	return p2p.Send(p.rw, TxMsg, txs)
}

func (p *peer) SendNewBlockHashes(hashes []common.Hash, numbers []uint64) error {
	for _, hash := range hashes {
		p.knownBlocks.Add(hash)
	}
	request := make(newBlockHashesData, len(hashes))
	for i := 0; i < len(hashes); i++ {
		request[i].Hash = hashes[i]
		request[i].Number = numbers[i]
	}
	return p2p.Send(p.rw, NewBlockHashesMsg, request)
}

func (p *peer) SendNewBlock(block *types.Block, td *big.Int) error {
	p.knownBlocks.Add(block.Hash())
	return p2p.Send(p.rw, NewBlockMsg, []interface{}{block, td})
}

func (p *peer) SendBlockHeaders(headers []*types.Header) error {
	return p2p.Send(p.rw, BlockHeadersMsg, headers)
}

func (p *peer) SendBlockBodies(bodies []*blockBody) error {
	return p2p.Send(p.rw, BlockBodiesMsg, blockBodiesData(bodies))
}

func (p *peer) SendBlockBodiesRLP(bodies []rlp.RawValue) error {
	return p2p.Send(p.rw, BlockBodiesMsg, bodies)
}

func (p *peer) SendNodeData(data [][]byte) error {
	return p2p.Send(p.rw, NodeDataMsg, data)
}

func (p *peer) SendReceiptsRLP(receipts []rlp.RawValue) error {
	return p2p.Send(p.rw, ReceiptsMsg, receipts)
}

func (p *peer) SendTX3ProofData(proofDatas []*types.TX3ProofData) error {
	for _, proofData := range proofDatas {
		p.knownTX3ProofDatas.Add(proofData.Header.Hash())
	}
	return p2p.Send(p.rw, TX3ProofDataMsg, proofDatas)
}

func (p *peer) SendPreimagesRLP(preimages [][]byte) error {
	return p2p.Send(p.rw, PreImagesMsg, preimages)
}

func (p *peer) SendTrieNodeData(data [][]byte) error {
	return p2p.Send(p.rw, TrieNodeDataMsg, data)
}

func (p *peer) RequestOneHeader(hash common.Hash) error {
	p.Log().Debug("Fetching single header", "hash", hash)
	return p2p.Send(p.rw, GetBlockHeadersMsg, &getBlockHeadersData{Origin: hashOrNumber{Hash: hash}, Amount: uint64(1), Skip: uint64(0), Reverse: false})
}

func (p *peer) RequestHeadersByHash(origin common.Hash, amount int, skip int, reverse bool) error {
	p.Log().Debug("Fetching batch of headers", "count", amount, "fromhash", origin, "skip", skip, "reverse", reverse)
	return p2p.Send(p.rw, GetBlockHeadersMsg, &getBlockHeadersData{Origin: hashOrNumber{Hash: origin}, Amount: uint64(amount), Skip: uint64(skip), Reverse: reverse})
}

func (p *peer) RequestHeadersByNumber(origin uint64, amount int, skip int, reverse bool) error {
	p.Log().Debug("Fetching batch of headers", "count", amount, "fromnum", origin, "skip", skip, "reverse", reverse)
	return p2p.Send(p.rw, GetBlockHeadersMsg, &getBlockHeadersData{Origin: hashOrNumber{Number: origin}, Amount: uint64(amount), Skip: uint64(skip), Reverse: reverse})
}

func (p *peer) RequestBodies(hashes []common.Hash) error {
	p.Log().Debug("Fetching batch of block bodies", "count", len(hashes))
	return p2p.Send(p.rw, GetBlockBodiesMsg, hashes)
}

func (p *peer) RequestNodeData(hashes []common.Hash) error {
	p.Log().Debug("Fetching batch of state data", "count", len(hashes))
	return p2p.Send(p.rw, GetNodeDataMsg, hashes)
}

func (p *peer) RequestReceipts(hashes []common.Hash) error {
	p.Log().Debug("Fetching batch of receipts", "count", len(hashes))
	return p2p.Send(p.rw, GetReceiptsMsg, hashes)
}

func (p *peer) RequestPreimages(hashes []common.Hash) error {
	p.Log().Debug("Fetching batch of preimages", "count", len(hashes))
	return p2p.Send(p.rw, GetPreImagesMsg, hashes)
}

func (p *peer) Handshake(network uint64, td *big.Int, head common.Hash, genesis common.Hash) error {

	errc := make(chan error, 2)
	var status statusData

	go func() {
		errc <- p2p.Send(p.rw, StatusMsg, &statusData{
			ProtocolVersion: uint32(p.version),
			NetworkId:       network,
			TD:              td,
			CurrentBlock:    head,
			GenesisBlock:    genesis,
		})
	}()
	go func() {
		errc <- p.readStatus(network, &status, genesis)
	}()
	timeout := time.NewTimer(handshakeTimeout)
	defer timeout.Stop()
	for i := 0; i < 2; i++ {
		select {
		case err := <-errc:
			if err != nil {
				return err
			}
		case <-timeout.C:
			return p2p.DiscReadTimeout
		}
	}
	p.td, p.head = status.TD, status.CurrentBlock
	return nil
}

func (p *peer) readStatus(network uint64, status *statusData, genesis common.Hash) (err error) {
	msg, err := p.rw.ReadMsg()
	if err != nil {
		return err
	}
	if msg.Code != StatusMsg {
		return errResp(ErrNoStatusMsg, "first msg has code %x (!= %x)", msg.Code, StatusMsg)
	}
	if msg.Size > ProtocolMaxMsgSize {
		return errResp(ErrMsgTooLarge, "%v > %v", msg.Size, ProtocolMaxMsgSize)
	}

	if err := msg.Decode(&status); err != nil {
		return errResp(ErrDecode, "msg %v: %v", msg, err)
	}
	if status.GenesisBlock != genesis {
		return errResp(ErrGenesisBlockMismatch, "%x (!= %x)", status.GenesisBlock[:8], genesis[:8])
	}
	if status.NetworkId != network {
		return errResp(ErrNetworkIdMismatch, "%d (!= %d)", status.NetworkId, network)
	}
	if int(status.ProtocolVersion) != p.version {
		return errResp(ErrProtocolVersionMismatch, "%d (!= %d)", status.ProtocolVersion, p.version)
	}
	return nil
}

func (p *peer) String() string {
	return fmt.Sprintf("Peer %s [%s]", p.id,
		fmt.Sprintf("%v/%2d", p.pname, p.version),
	)
}

type peerSet struct {
	peers  map[string]*peer
	lock   sync.RWMutex
	closed bool
}

func newPeerSet() *peerSet {
	return &peerSet{
		peers: make(map[string]*peer),
	}
}

func (ps *peerSet) Register(p *peer) error {
	ps.lock.Lock()
	defer ps.lock.Unlock()

	if ps.closed {
		return errClosed
	}
	if _, ok := ps.peers[p.id]; ok {
		return errAlreadyRegistered
	}
	ps.peers[p.id] = p
	return nil
}

func (ps *peerSet) Unregister(id string) error {
	ps.lock.Lock()
	defer ps.lock.Unlock()

	if _, ok := ps.peers[id]; !ok {
		return errNotRegistered
	}
	delete(ps.peers, id)
	return nil
}

func (ps *peerSet) Peers() map[string]*peer {
	ps.lock.RLock()
	defer ps.lock.RUnlock()

	set := make(map[string]*peer)
	for id, p := range ps.peers {
		set[id] = p
	}
	return set
}

func (ps *peerSet) Peer(id string) *peer {
	ps.lock.RLock()
	defer ps.lock.RUnlock()

	return ps.peers[id]
}

func (ps *peerSet) Len() int {
	ps.lock.RLock()
	defer ps.lock.RUnlock()

	return len(ps.peers)
}

func (ps *peerSet) PeersWithoutBlock(hash common.Hash) []*peer {
	ps.lock.RLock()
	defer ps.lock.RUnlock()

	list := make([]*peer, 0, len(ps.peers))
	for _, p := range ps.peers {
		if !p.knownBlocks.Has(hash) {
			list = append(list, p)
		}
	}
	return list
}

func (ps *peerSet) PeersWithoutTx(hash common.Hash) []*peer {
	ps.lock.RLock()
	defer ps.lock.RUnlock()

	list := make([]*peer, 0, len(ps.peers))
	for _, p := range ps.peers {
		if !p.knownTxs.Has(hash) {
			list = append(list, p)
		}
	}
	return list
}

func (ps *peerSet) PeersWithoutTX3ProofData(hash common.Hash) []*peer {
	ps.lock.RLock()
	defer ps.lock.RUnlock()

	list := make([]*peer, 0, len(ps.peers))
	for _, p := range ps.peers {
		if !p.knownTX3ProofDatas.Has(hash) {
			list = append(list, p)
		}
	}
	return list
}

func (ps *peerSet) BestPeer() *peer {
	ps.lock.RLock()
	defer ps.lock.RUnlock()

	var (
		bestPeer *peer
		bestTd   *big.Int
	)
	for _, p := range ps.peers {
		if _, td := p.Head(); bestPeer == nil || td.Cmp(bestTd) > 0 {
			bestPeer, bestTd = p, td
		}
	}
	return bestPeer
}

func (ps *peerSet) Close() {
	ps.lock.Lock()
	defer ps.lock.Unlock()

	for _, p := range ps.peers {
		p.Disconnect(p2p.DiscQuitting)
	}
	ps.closed = true
}