-
Notifications
You must be signed in to change notification settings - Fork 1k
/
server.go
184 lines (153 loc) · 4.52 KB
/
server.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
package observer
import (
"context"
"crypto/ecdsa"
"errors"
"fmt"
"net"
"path/filepath"
"github.com/ledgerwatch/erigon/cmd/utils"
"github.com/ledgerwatch/erigon/common/debug"
"github.com/ledgerwatch/erigon/core/forkid"
"github.com/ledgerwatch/erigon/eth/protocols/eth"
"github.com/ledgerwatch/erigon/p2p"
"github.com/ledgerwatch/erigon/p2p/discover"
"github.com/ledgerwatch/erigon/p2p/enode"
"github.com/ledgerwatch/erigon/p2p/enr"
"github.com/ledgerwatch/erigon/p2p/nat"
"github.com/ledgerwatch/erigon/p2p/netutil"
"github.com/ledgerwatch/erigon/params"
"github.com/ledgerwatch/log/v3"
)
type Server struct {
localNode *enode.LocalNode
listenAddr string
natInterface nat.Interface
discConfig discover.Config
log log.Logger
}
func NewServer(flags CommandFlags) (*Server, error) {
nodeDBPath := filepath.Join(flags.DataDir, "nodes", "eth67")
nodeKeyConfig := p2p.NodeKeyConfig{}
privateKey, err := nodeKeyConfig.LoadOrParseOrGenerateAndSave(flags.NodeKeyFile, flags.NodeKeyHex, flags.DataDir)
if err != nil {
return nil, err
}
localNode, err := makeLocalNode(nodeDBPath, privateKey, flags.Chain)
if err != nil {
return nil, err
}
listenAddr := fmt.Sprintf(":%d", flags.ListenPort)
natInterface, err := nat.Parse(flags.NATDesc)
if err != nil {
return nil, fmt.Errorf("NAT parse error: %w", err)
}
var netRestrictList *netutil.Netlist
if flags.NetRestrict != "" {
netRestrictList, err = netutil.ParseNetlist(flags.NetRestrict)
if err != nil {
return nil, fmt.Errorf("net restrict parse error: %w", err)
}
}
bootnodes, err := utils.GetBootnodesFromFlags(flags.Bootnodes, flags.Chain)
if err != nil {
return nil, fmt.Errorf("bootnodes parse error: %w", err)
}
logger := log.New()
discConfig := discover.Config{
PrivateKey: privateKey,
NetRestrict: netRestrictList,
Bootnodes: bootnodes,
Log: logger.New(),
}
instance := Server{
localNode,
listenAddr,
natInterface,
discConfig,
logger,
}
return &instance, nil
}
func makeLocalNode(nodeDBPath string, privateKey *ecdsa.PrivateKey, chain string) (*enode.LocalNode, error) {
db, err := enode.OpenDB(nodeDBPath)
if err != nil {
return nil, err
}
localNode := enode.NewLocalNode(db, privateKey)
localNode.SetFallbackIP(net.IP{127, 0, 0, 1})
forksEntry, err := makeForksENREntry(chain)
if err != nil {
return nil, err
}
localNode.Set(forksEntry)
return localNode, nil
}
func makeForksENREntry(chain string) (enr.Entry, error) {
chainConfig := params.ChainConfigByChainName(chain)
genesisHash := params.GenesisHashByChainName(chain)
if (chainConfig == nil) || (genesisHash == nil) {
return nil, fmt.Errorf("unknown chain %s", chain)
}
forks := forkid.GatherForks(chainConfig)
return eth.CurrentENREntryFromForks(forks, *genesisHash, 0), nil
}
func (server *Server) Bootnodes() []*enode.Node {
return server.discConfig.Bootnodes
}
func (server *Server) PrivateKey() *ecdsa.PrivateKey {
return server.discConfig.PrivateKey
}
func (server *Server) mapNATPort(ctx context.Context, realAddr *net.UDPAddr) {
if server.natInterface == nil {
return
}
if realAddr.IP.IsLoopback() {
return
}
if !server.natInterface.SupportsMapping() {
return
}
go func() {
defer debug.LogPanic()
nat.Map(server.natInterface, ctx.Done(), "udp", realAddr.Port, realAddr.Port, "ethereum discovery")
}()
}
func (server *Server) detectNATExternalIP() (net.IP, error) {
if server.natInterface == nil {
return nil, errors.New("no NAT flag configured")
}
if _, hasExtIP := server.natInterface.(nat.ExtIP); !hasExtIP {
server.log.Debug("Detecting external IP...")
}
ip, err := server.natInterface.ExternalIP()
if err != nil {
return nil, fmt.Errorf("NAT ExternalIP error: %w", err)
}
server.log.Debug("External IP detected", "ip", ip)
return ip, nil
}
func (server *Server) Listen(ctx context.Context) (*discover.UDPv4, error) {
if server.natInterface != nil {
ip, err := server.detectNATExternalIP()
if err != nil {
return nil, err
}
server.localNode.SetStaticIP(ip)
}
addr, err := net.ResolveUDPAddr("udp", server.listenAddr)
if err != nil {
return nil, fmt.Errorf("ResolveUDPAddr error: %w", err)
}
conn, err := net.ListenUDP("udp", addr)
if err != nil {
return nil, fmt.Errorf("ListenUDP error: %w", err)
}
realAddr := conn.LocalAddr().(*net.UDPAddr)
server.localNode.SetFallbackUDP(realAddr.Port)
if server.natInterface != nil {
server.mapNATPort(ctx, realAddr)
}
server.log.Debug("Discovery UDP listener is up", "addr", realAddr)
return discover.ListenV4(ctx, conn, server.localNode, server.discConfig)
}