forked from ethereum/go-ethereum
-
Notifications
You must be signed in to change notification settings - Fork 2
/
entries.go
160 lines (132 loc) · 4.16 KB
/
entries.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
// Copyright 2017 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package enr
import (
"crypto/ecdsa"
"fmt"
"io"
"net"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/rlp"
)
// Entry is implemented by known node record entry types.
//
// To define a new entry that is to be included in a node record,
// create a Go type that satisfies this interface. The type should
// also implement rlp.Decoder if additional checks are needed on the value.
type Entry interface {
ENRKey() string
}
type generic struct {
key string
value interface{}
}
func (g generic) ENRKey() string { return g.key }
func (g generic) EncodeRLP(w io.Writer) error {
return rlp.Encode(w, g.value)
}
func (g *generic) DecodeRLP(s *rlp.Stream) error {
return s.Decode(g.value)
}
// WithEntry wraps any value with a key name. It can be used to set and load arbitrary values
// in a record. The value v must be supported by rlp. To use WithEntry with Load, the value
// must be a pointer.
func WithEntry(k string, v interface{}) Entry {
return &generic{key: k, value: v}
}
// DiscPort is the "discv5" key, which holds the UDP port for discovery v5.
type DiscPort uint16
func (v DiscPort) ENRKey() string { return "discv5" }
// ID is the "id" key, which holds the name of the identity scheme.
type ID string
func (v ID) ENRKey() string { return "id" }
// IP4 is the "ip4" key, which holds a 4-byte IPv4 address.
type IP4 net.IP
func (v IP4) ENRKey() string { return "ip4" }
// EncodeRLP implements rlp.Encoder.
func (v IP4) EncodeRLP(w io.Writer) error {
ip4 := net.IP(v).To4()
if ip4 == nil {
return fmt.Errorf("invalid IPv4 address: %v", v)
}
return rlp.Encode(w, ip4)
}
// DecodeRLP implements rlp.Decoder.
func (v *IP4) DecodeRLP(s *rlp.Stream) error {
if err := s.Decode((*net.IP)(v)); err != nil {
return err
}
if len(*v) != 4 {
return fmt.Errorf("invalid IPv4 address, want 4 bytes: %v", *v)
}
return nil
}
// IP6 is the "ip6" key, which holds a 16-byte IPv6 address.
type IP6 net.IP
func (v IP6) ENRKey() string { return "ip6" }
// EncodeRLP implements rlp.Encoder.
func (v IP6) EncodeRLP(w io.Writer) error {
ip6 := net.IP(v)
return rlp.Encode(w, ip6)
}
// DecodeRLP implements rlp.Decoder.
func (v *IP6) DecodeRLP(s *rlp.Stream) error {
if err := s.Decode((*net.IP)(v)); err != nil {
return err
}
if len(*v) != 16 {
return fmt.Errorf("invalid IPv6 address, want 16 bytes: %v", *v)
}
return nil
}
// Secp256k1 is the "secp256k1" key, which holds a public key.
type Secp256k1 ecdsa.PublicKey
func (v Secp256k1) ENRKey() string { return "secp256k1" }
// EncodeRLP implements rlp.Encoder.
func (v Secp256k1) EncodeRLP(w io.Writer) error {
return rlp.Encode(w, crypto.CompressPubkey((*ecdsa.PublicKey)(&v)))
}
// DecodeRLP implements rlp.Decoder.
func (v *Secp256k1) DecodeRLP(s *rlp.Stream) error {
buf, err := s.Bytes()
if err != nil {
return err
}
pk, err := crypto.DecompressPubkey(buf)
if err != nil {
return err
}
*v = (Secp256k1)(*pk)
return nil
}
// KeyError is an error related to a key.
type KeyError struct {
Key string
Err error
}
// Error implements error.
func (err *KeyError) Error() string {
if err.Err == errNotFound {
return fmt.Sprintf("missing ENR key %q", err.Key)
}
return fmt.Sprintf("ENR key %q: %v", err.Key, err.Err)
}
// IsNotFound reports whether the given error means that a key/value pair is
// missing from a record.
func IsNotFound(err error) bool {
kerr, ok := err.(*KeyError)
return ok && kerr.Err == errNotFound
}