113 lines
2.6 KiB
Go
113 lines
2.6 KiB
Go
// Copyright (c) 2017-2026 Lethean (https://lt.hn)
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//
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// Licensed under the European Union Public Licence (EUPL) version 1.2.
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// SPDX-License-Identifier: EUPL-1.2
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package blockchain
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import (
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"context"
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"crypto/rand"
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"encoding/binary"
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"log"
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"net"
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"time"
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"dappco.re/go/core"
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coreerr "dappco.re/go/core/log"
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"dappco.re/go/core/blockchain/chain"
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"dappco.re/go/core/blockchain/config"
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"dappco.re/go/core/blockchain/p2p"
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levin "dappco.re/go/core/p2p/node/levin"
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)
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func syncLoop(ctx context.Context, c *chain.Chain, cfg *config.ChainConfig, forks []config.HardFork, seed string) {
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opts := chain.SyncOptions{
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VerifySignatures: false,
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Forks: forks,
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}
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for {
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select {
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case <-ctx.Done():
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return
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default:
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}
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if err := syncOnce(ctx, c, cfg, opts, seed); err != nil {
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log.Printf("sync: %v (retrying in 10s)", err)
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select {
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case <-ctx.Done():
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return
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case <-time.After(10 * time.Second):
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}
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continue
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}
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select {
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case <-ctx.Done():
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return
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case <-time.After(30 * time.Second):
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}
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}
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}
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func syncOnce(ctx context.Context, c *chain.Chain, cfg *config.ChainConfig, opts chain.SyncOptions, seed string) error {
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conn, err := net.DialTimeout("tcp", seed, 10*time.Second)
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if err != nil {
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return coreerr.E("syncOnce", core.Sprintf("dial %s", seed), err)
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}
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defer conn.Close()
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lc := levin.NewConnection(conn)
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var peerIDBuf [8]byte
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rand.Read(peerIDBuf[:])
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peerID := binary.LittleEndian.Uint64(peerIDBuf[:])
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localHeight, _ := c.Height()
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req := p2p.HandshakeRequest{
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NodeData: p2p.NodeData{
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NetworkID: cfg.NetworkID,
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PeerID: peerID,
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LocalTime: time.Now().Unix(),
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MyPort: 0,
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},
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PayloadData: p2p.CoreSyncData{
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CurrentHeight: localHeight,
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ClientVersion: config.ClientVersion,
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NonPruningMode: true,
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},
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}
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payload, err := p2p.EncodeHandshakeRequest(&req)
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if err != nil {
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return coreerr.E("syncOnce", "encode handshake", err)
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}
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if err := lc.WritePacket(p2p.CommandHandshake, payload, true); err != nil {
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return coreerr.E("syncOnce", "write handshake", err)
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}
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hdr, data, err := lc.ReadPacket()
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if err != nil {
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return coreerr.E("syncOnce", "read handshake", err)
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}
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if hdr.Command != uint32(p2p.CommandHandshake) {
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return coreerr.E("syncOnce", core.Sprintf("unexpected command %d", hdr.Command), nil)
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}
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var resp p2p.HandshakeResponse
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if err := resp.Decode(data); err != nil {
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return coreerr.E("syncOnce", "decode handshake", err)
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}
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localSync := p2p.CoreSyncData{
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CurrentHeight: localHeight,
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ClientVersion: config.ClientVersion,
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NonPruningMode: true,
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}
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p2pConn := chain.NewLevinP2PConn(lc, resp.PayloadData.CurrentHeight, localSync)
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return c.P2PSync(ctx, p2pConn, opts)
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}
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