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package eth
import (
"fmt"
"math/big"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/logger"
"github.com/ethereum/go-ethereum/logger/glog"
"github.com/ethereum/go-ethereum/p2p"
"gopkg.in/fatih/set.v0"
)
type statusMsgData struct {
ProtocolVersion uint32
NetworkId uint32
TD *big.Int
CurrentBlock common.Hash
GenesisBlock common.Hash
}
type getBlockHashesMsgData struct {
Hash common.Hash
Amount uint64
}
func getBestPeer(peers map[string]*peer) *peer {
var peer *peer
for _, cp := range peers {
if peer == nil || cp.td.Cmp(peer.td) > 0 {
peer = cp
}
}
return peer
}
type peer struct {
*p2p.Peer
rw p2p.MsgReadWriter
protv, netid int
recentHash common.Hash
id string
td *big.Int
genesis, ourHash common.Hash
ourTd *big.Int
txHashes *set.Set
blockHashes *set.Set
}
func newPeer(protv, netid int, genesis, recentHash common.Hash, td *big.Int, p *p2p.Peer, rw p2p.MsgReadWriter) *peer {
id := p.ID()
return &peer{
Peer: p,
rw: rw,
genesis: genesis,
ourHash: recentHash,
ourTd: td,
protv: protv,
netid: netid,
id: fmt.Sprintf("%x", id[:8]),
txHashes: set.New(),
blockHashes: set.New(),
}
}
// sendTransactions sends transactions to the peer and includes the hashes
// in it's tx hash set for future reference. The tx hash will allow the
// manager to check whether the peer has already received this particular
// transaction
func (p *peer) sendTransactions(txs types.Transactions) error {
for _, tx := range txs {
p.txHashes.Add(tx.Hash())
}
return p2p.Send(p.rw, TxMsg, txs)
}
func (p *peer) sendBlockHashes(hashes []common.Hash) error {
return p2p.Send(p.rw, BlockHashesMsg, hashes)
}
func (p *peer) sendBlocks(blocks []*types.Block) error {
return p2p.Send(p.rw, BlocksMsg, blocks)
}
func (p *peer) sendNewBlock(block *types.Block) error {
p.blockHashes.Add(block.Hash())
return p2p.Send(p.rw, NewBlockMsg, []interface{}{block, block.Td})
}
func (p *peer) sendTransaction(tx *types.Transaction) error {
p.txHashes.Add(tx.Hash())
return p2p.Send(p.rw, TxMsg, []*types.Transaction{tx})
}
func (p *peer) requestHashes(from common.Hash) error {
glog.V(logger.Debug).Infof("[%s] fetching hashes (%d) %x...\n", p.id, maxHashes, from[:4])
return p2p.Send(p.rw, GetBlockHashesMsg, getBlockHashesMsgData{from, maxHashes})
}
func (p *peer) requestBlocks(hashes []common.Hash) error {
glog.V(logger.Debug).Infof("[%s] fetching %v blocks\n", p.id, len(hashes))
return p2p.Send(p.rw, GetBlocksMsg, hashes)
}
func (p *peer) handleStatus() error {
errc := make(chan error, 1)
go func() {
errc <- p2p.Send(p.rw, StatusMsg, &statusMsgData{
ProtocolVersion: uint32(p.protv),
NetworkId: uint32(p.netid),
TD: p.ourTd,
CurrentBlock: p.ourHash,
GenesisBlock: p.genesis,
})
}()
// read and handle remote status
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)
}
var status statusMsgData
if err := msg.Decode(&status); err != nil {
return errResp(ErrDecode, "msg %v: %v", msg, err)
}
if status.GenesisBlock != p.genesis {
return errResp(ErrGenesisBlockMismatch, "%x (!= %x)", status.GenesisBlock, p.genesis)
}
if int(status.NetworkId) != p.netid {
return errResp(ErrNetworkIdMismatch, "%d (!= %d)", status.NetworkId, p.netid)
}
if int(status.ProtocolVersion) != p.protv {
return errResp(ErrProtocolVersionMismatch, "%d (!= %d)", status.ProtocolVersion, p.protv)
}
// Set the total difficulty of the peer
p.td = status.TD
// set the best hash of the peer
p.recentHash = status.CurrentBlock
return <-errc
}
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