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
|
package main
import (
"container/list"
"github.com/ethereum/ethdb-go"
"github.com/ethereum/ethutil-go"
"github.com/ethereum/ethwire-go"
"log"
"net"
"time"
"sync/atomic"
)
func eachPeer(peers *list.List, callback func(*Peer, *list.Element)) {
// Loop thru the peers and close them (if we had them)
for e := peers.Front(); e != nil; e = e.Next() {
if peer, ok := e.Value.(*Peer); ok {
callback(peer, e)
}
}
}
type Server struct {
// Channel for shutting down the server
shutdownChan chan bool
// DB interface
//db *ethdb.LDBDatabase
db *ethdb.MemDatabase
// Block manager for processing new blocks and managing the block chain
blockManager *BlockManager
// Peers (NYI)
peers *list.List
// Nonce
Nonce uint64
}
func NewServer() (*Server, error) {
//db, err := ethdb.NewLDBDatabase()
db, err := ethdb.NewMemDatabase()
if err != nil {
return nil, err
}
ethutil.SetConfig(db)
nonce, _ := ethutil.RandomUint64()
server := &Server{
shutdownChan: make(chan bool),
blockManager: NewBlockManager(),
db: db,
peers: list.New(),
Nonce: nonce,
}
return server, nil
}
func (s *Server) AddPeer(conn net.Conn) {
peer := NewPeer(conn, s, true)
if peer != nil {
s.peers.PushBack(peer)
peer.Start()
log.Println("Peer connected ::", conn.RemoteAddr())
}
}
func (s *Server) ConnectToPeer(addr string) error {
peer := NewOutboundPeer(addr, s)
s.peers.PushBack(peer)
return nil
}
func (s *Server) Broadcast(msgType string, data []byte) {
eachPeer(s.peers, func(p *Peer, e *list.Element) {
p.QueueMessage(ethwire.NewMessage(msgType, 0, data))
})
}
const (
processReapingTimeout = 10 // TODO increase
)
func (s *Server) ReapDeadPeers() {
for {
eachPeer(s.peers, func(p *Peer, e *list.Element) {
if atomic.LoadInt32(&p.disconnect) == 1 {
log.Println("Dead peer found .. reaping")
s.peers.Remove(e)
}
})
time.Sleep(processReapingTimeout * time.Second)
}
}
// Start the server
func (s *Server) Start() {
// For now this function just blocks the main thread
ln, err := net.Listen("tcp", ":12345")
if err != nil {
// This is mainly for testing to create a "network"
if Debug {
log.Println("Connection listening disabled. Acting as client")
err = s.ConnectToPeer("localhost:12345")
if err != nil {
log.Println("Error starting server", err)
s.Stop()
}
return
} else {
log.Fatal(err)
}
}
// Start the reaping processes
go s.ReapDeadPeers()
go func() {
for {
conn, err := ln.Accept()
if err != nil {
log.Println(err)
continue
}
go s.AddPeer(conn)
}
}()
// TMP
/*
go func() {
for {
s.Broadcast("block", s.blockManager.bc.GenesisBlock().MarshalRlp())
time.Sleep(1000 * time.Millisecond)
}
}()
*/
}
func (s *Server) Stop() {
// Close the database
defer s.db.Close()
eachPeer(s.peers, func(p *Peer, e *list.Element) {
p.Stop()
})
s.shutdownChan <- true
}
// This function will wait for a shutdown and resumes main thread execution
func (s *Server) WaitForShutdown() {
<-s.shutdownChan
}
|
