-
Notifications
You must be signed in to change notification settings - Fork 3
/
pubsub.go
153 lines (121 loc) · 2.8 KB
/
pubsub.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
package pubsub
import (
"encoding/json"
"io"
"sync"
"gx/ipfs/QmZy2y8t9zQH2a1b8q2ZSLKp17ATuJoCNxxyMFG5qFExpt/go-net/context"
"gx/ipfs/QmRBqJF7hb8ZSpRcMwUt8hNhydWcxGEhtk81HKq6oUwKvs/go-libp2p-peer"
"gx/ipfs/QmVCe3SNMjkcPgnpFhZs719dheq6xE7gJwjzV7aWcUM4Ms/go-libp2p/p2p/host"
"gx/ipfs/QmVCe3SNMjkcPgnpFhZs719dheq6xE7gJwjzV7aWcUM4Ms/go-libp2p/p2p/net"
"gx/ipfs/QmVCe3SNMjkcPgnpFhZs719dheq6xE7gJwjzV7aWcUM4Ms/go-libp2p/p2p/protocol"
)
const DefaultTreeWidth = 2
const DefaultTreeMaxWidth = 5
type TopicManager struct {
Topics map[string]*Topic
topicslk sync.Mutex
h host.Host
}
func NewTopicManager(h host.Host) *TopicManager {
return &TopicManager{
Topics: make(map[string]*Topic),
h: h,
}
}
type Topic struct {
h host.Host
sub *subtree
peers map[peer.ID]net.Stream
plock sync.Mutex
id protocol.ID
title string
ctx context.Context
tm *TopicManager
}
type TreeOpts struct {
TreeWidth int
TreeMaxWidth int
}
func (tm *TopicManager) NewTopic(ctx context.Context, title string, opts ...TreeOpts) *Topic {
id := protocol.ID(string(tm.h.ID()) + "/" + title)
t := &Topic{
h: tm.h,
tm: tm,
id: id,
ctx: ctx,
peers: make(map[peer.ID]net.Stream),
title: title,
sub: newSubtree(ctx, tm.h, id),
}
if len(opts) > 0 {
t.sub.treeWidth = opts[0].TreeWidth
t.sub.treeMaxWidth = opts[0].TreeMaxWidth
} else {
t.sub.treeWidth = DefaultTreeWidth
t.sub.treeMaxWidth = DefaultTreeMaxWidth
}
tm.h.SetStreamHandler(t.id, func(s net.Stream) {
hello, err := readMessage(s)
if err != nil {
log.Error(err)
return
}
if hello.Type != Join {
log.Error("received new stream without join message")
s.Close()
return
}
err = t.AddPeer(s)
if err != nil {
log.Error(err)
return
}
})
tm.Topics[title] = t
return t
}
func (t *Topic) Close() error {
t.h.RemoveStreamHandler(t.id)
delete(t.tm.Topics, t.title)
return nil
}
func (t *Topic) AddPeer(s net.Stream) error {
t.sub.chlock.Lock()
defer t.sub.chlock.Unlock()
return t.sub.handleJoin(s, false)
}
func (t *Topic) PublishMessage(mes []byte) error {
mobj := &Message{
Type: Data,
Data: mes,
}
// TODO: add signature
return t.sub.forwardMessage(mobj)
}
func writeMessage(s net.Stream, m *Message) error {
return json.NewEncoder(s).Encode(m)
}
func readMessage(r io.Reader) (*Message, error) {
m := new(Message)
err := json.NewDecoder(r).Decode(m)
if err != nil {
return nil, err
}
return m, nil
}
type MessageType int
const (
Data = MessageType(iota)
Join
Part
Update
State
)
type Message struct {
Type MessageType
Data []byte `json:"data,omitempty"`
Peers []string `json:"parents,omitempty"`
TreeWidth int `json:"treewidth,omitempty"`
TreeMaxWidth int `json:"treemaxwidth,omitempty"`
NumPeers int `json:"numpeers,omitempty"`
}