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
|
package main
import (
"github.com/ethereum/ethutil-go"
"github.com/ethereum/ethwire-go"
"log"
"net"
)
type Peer struct {
// Server interface
server *Server
// Net connection
conn net.Conn
// Output queue which is used to communicate and handle messages
outputQueue chan *ethwire.InOutMsg
// Quit channel
quit chan bool
inbound bool // Determines whether it's an inbound or outbound peer
}
func NewPeer(conn net.Conn, server *Server, inbound bool) *Peer {
return &Peer{
outputQueue: make(chan *ethwire.InOutMsg, 1), // Buffered chan of 1 is enough
quit: make(chan bool),
server: server,
conn: conn,
inbound: inbound,
}
}
// Outputs any RLP encoded data to the peer
func (p *Peer) QueueMessage(msg *ethwire.InOutMsg) {
p.outputQueue <- msg //ethwire.InOutMsg{MsgType: msgType, Nonce: ethutil.RandomUint64(), Data: data}
}
// Outbound message handler. Outbound messages are handled here
func (p *Peer) HandleOutbound() {
out:
for {
select {
// Main message queue. All outbound messages are processed through here
case msg := <-p.outputQueue:
// TODO Message checking and handle accordingly
err := ethwire.WriteMessage(p.conn, msg)
if err != nil {
log.Println(err)
// Stop the client if there was an error writing to it
p.Stop()
}
// Break out of the for loop if a quit message is posted
case <-p.quit:
break out
}
}
}
// Inbound handler. Inbound messages are received here and passed to the appropriate methods
func (p *Peer) HandleInbound() {
defer p.Stop()
out:
for {
// Wait for a message from the peer
msg, err := ethwire.ReadMessage(p.conn)
if err != nil {
log.Println(err)
break out
}
if Debug {
log.Printf("Received %s\n", msg.MsgType)
}
// TODO Hash data and check if for existence (= ignore)
switch msg.MsgType {
case "verack":
// Version message
p.handleVersionAck(msg)
case "block":
err := p.server.blockManager.ProcessBlock(ethutil.NewBlock(msg.Data))
if err != nil {
log.Println(err)
}
}
}
// Notify the out handler we're quiting
p.quit <- true
}
func (p *Peer) Start() {
if !p.inbound {
err := p.pushVersionAck()
if err != nil {
log.Printf("Peer can't send outbound version ack", err)
p.Stop()
}
}
// Run the outbound handler in a new goroutine
go p.HandleOutbound()
// Run the inbound handler in a new goroutine
go p.HandleInbound()
}
func (p *Peer) Stop() {
p.conn.Close()
p.quit <- true
}
func (p *Peer) pushVersionAck() error {
msg := ethwire.NewMessage("verack", p.server.Nonce, []byte("01"))
p.QueueMessage(msg)
return nil
}
func (p *Peer) handleVersionAck(msg *ethwire.InOutMsg) {
// Detect self connect
if msg.Nonce == p.server.Nonce {
log.Println("Peer connected to self, disconnecting")
p.Stop()
return
}
log.Println("mnonce", msg.Nonce, "snonce", p.server.Nonce)
// If this is an inbound connection send an ack back
if p.inbound {
err := p.pushVersionAck()
if err != nil {
log.Println("Peer can't send ack back")
p.Stop()
}
}
}
|