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
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
|
package whisper
import (
"bytes"
"crypto/ecdsa"
"errors"
"fmt"
"sync"
"time"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/event/filter"
"github.com/ethereum/go-ethereum/p2p"
"gopkg.in/fatih/set.v0"
)
// MOVE ME
type Hash struct {
hash string
}
var EmptyHash Hash
func H(hash []byte) Hash {
return Hash{string(hash)}
}
func HS(hash string) Hash {
return Hash{hash}
}
func (self Hash) Compare(other Hash) int {
return bytes.Compare([]byte(self.hash), []byte(other.hash))
}
// MOVE ME END
const (
statusMsg = 0x0
envelopesMsg = 0x01
)
type MessageEvent struct {
To *ecdsa.PrivateKey
From *ecdsa.PublicKey
Message *Message
}
const DefaultTtl = 50 * time.Second
type Whisper struct {
protocol p2p.Protocol
filters *filter.Filters
mmu sync.RWMutex
messages map[Hash]*Envelope
expiry map[uint32]*set.SetNonTS
quit chan struct{}
keys []*ecdsa.PrivateKey
}
func New() *Whisper {
whisper := &Whisper{
messages: make(map[Hash]*Envelope),
filters: filter.New(),
expiry: make(map[uint32]*set.SetNonTS),
quit: make(chan struct{}),
}
whisper.filters.Start()
go whisper.update()
// XXX TODO REMOVE TESTING CODE
msg := NewMessage([]byte(fmt.Sprintf("Hello world. This is whisper-go. Incase you're wondering; the time is %v", time.Now())))
envelope, _ := msg.Seal(DefaultPow, Opts{
Ttl: DefaultTtl,
})
if err := whisper.Send(envelope); err != nil {
fmt.Println(err)
}
// XXX TODO REMOVE TESTING CODE
// p2p whisper sub protocol handler
whisper.protocol = p2p.Protocol{
Name: "shh",
Version: 2,
Length: 2,
Run: whisper.msgHandler,
}
return whisper
}
func (self *Whisper) Stop() {
close(self.quit)
}
func (self *Whisper) Send(envelope *Envelope) error {
return self.add(envelope)
}
func (self *Whisper) NewIdentity() *ecdsa.PrivateKey {
key, err := crypto.GenerateKey()
if err != nil {
panic(err)
}
self.keys = append(self.keys, key)
return key
}
func (self *Whisper) HasIdentity(key *ecdsa.PrivateKey) bool {
for _, key := range self.keys {
if key.D.Cmp(key.D) == 0 {
return true
}
}
return false
}
func (self *Whisper) Watch(opts Filter) int {
return self.filters.Install(filter.Generic{
Str1: string(crypto.FromECDSA(opts.To)),
Str2: string(crypto.FromECDSAPub(opts.From)),
Fn: func(data interface{}) {
opts.Fn(data.(*Message))
},
})
}
// Main handler for passing whisper messages to whisper peer objects
func (self *Whisper) msgHandler(peer *p2p.Peer, ws p2p.MsgReadWriter) error {
wpeer := NewPeer(self, peer, ws)
// initialise whisper peer (handshake/status)
if err := wpeer.init(); err != nil {
return err
}
// kick of the main handler for broadcasting/managing envelopes
go wpeer.start()
defer wpeer.stop()
// Main *read* loop. Writing is done by the peer it self.
for {
msg, err := ws.ReadMsg()
if err != nil {
return err
}
envelope, err := NewEnvelopeFromReader(msg.Payload)
if err != nil {
peer.Infoln(err)
continue
}
if err := self.add(envelope); err != nil {
// TODO Punish peer here. Invalid envelope.
peer.Infoln(err)
}
wpeer.addKnown(envelope)
}
}
// takes care of adding envelopes to the messages pool. At this moment no sanity checks are being performed.
func (self *Whisper) add(envelope *Envelope) error {
if !envelope.valid() {
return errors.New("invalid pow provided for envelope")
}
self.mmu.Lock()
defer self.mmu.Unlock()
hash := envelope.Hash()
self.messages[hash] = envelope
if self.expiry[envelope.Expiry] == nil {
self.expiry[envelope.Expiry] = set.NewNonTS()
}
if !self.expiry[envelope.Expiry].Has(hash) {
self.expiry[envelope.Expiry].Add(hash)
self.postEvent(envelope)
}
return nil
}
func (self *Whisper) update() {
expire := time.NewTicker(800 * time.Millisecond)
out:
for {
select {
case <-expire.C:
self.expire()
case <-self.quit:
break out
}
}
}
func (self *Whisper) expire() {
self.mmu.Lock()
defer self.mmu.Unlock()
now := uint32(time.Now().Unix())
for then, hashSet := range self.expiry {
if then > now {
continue
}
hashSet.Each(func(v interface{}) bool {
delete(self.messages, v.(Hash))
return true
})
self.expiry[then].Clear()
}
}
func (self *Whisper) envelopes() (envelopes []*Envelope) {
self.mmu.RLock()
defer self.mmu.RUnlock()
envelopes = make([]*Envelope, len(self.messages))
i := 0
for _, envelope := range self.messages {
envelopes[i] = envelope
i++
}
return
}
func (self *Whisper) postEvent(envelope *Envelope) {
for _, key := range self.keys {
if message, err := envelope.Open(key); err == nil {
// Create a custom filter?
self.filters.Notify(filter.Generic{
Str1: string(crypto.FromECDSA(key)), Str2: string(crypto.FromECDSAPub(message.Recover())),
}, message)
} else {
fmt.Println(err)
}
}
}
func (self *Whisper) Protocol() p2p.Protocol {
return self.protocol
}
|
