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