-
Notifications
You must be signed in to change notification settings - Fork 143
/
domain.go
189 lines (175 loc) · 5.61 KB
/
domain.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
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
// Copyright 2020 IOTA Stiftung
// SPDX-License-Identifier: Apache-2.0
package domain
import (
"context"
"sync"
"github.com/iotaledger/hive.go/logger"
"github.com/iotaledger/wasp/packages/cryptolib"
"github.com/iotaledger/wasp/packages/peering"
"github.com/iotaledger/wasp/packages/util"
)
type DomainImpl struct {
netProvider peering.NetworkProvider
nodes map[cryptolib.PublicKeyKey]peering.PeerSender
permutation *util.Permutation16
permPubKeys []*cryptolib.PublicKey
peeringID peering.PeeringID
unhookFuncs []context.CancelFunc
log *logger.Logger
mutex *sync.RWMutex
}
var _ peering.PeerDomainProvider = &DomainImpl{}
// NewPeerDomain creates a collection. Ignores self
func NewPeerDomain(netProvider peering.NetworkProvider, peeringID peering.PeeringID, initialNodes []peering.PeerSender, log *logger.Logger) *DomainImpl {
ret := &DomainImpl{
netProvider: netProvider,
nodes: make(map[cryptolib.PublicKeyKey]peering.PeerSender),
permutation: nil, // Will be set in ret.reshufflePeers().
permPubKeys: nil, // Will be set in ret.reshufflePeers().
peeringID: peeringID,
unhookFuncs: make([]context.CancelFunc, 0),
log: log,
mutex: &sync.RWMutex{},
}
for _, sender := range initialNodes {
ret.nodes[sender.PubKey().AsKey()] = sender
}
ret.initPermPubKeys()
return ret
}
func (d *DomainImpl) SendMsgByPubKey(pubKey *cryptolib.PublicKey, msgReceiver, msgType byte, msgData []byte) {
d.mutex.RLock()
defer d.mutex.RUnlock()
peer, ok := d.nodes[pubKey.AsKey()]
if !ok {
d.log.Warnf("SendMsgByPubKey: PubKey %v is not in the domain", pubKey.String())
return
}
peer.SendMsg(peering.NewPeerMessageData(d.peeringID, msgReceiver, msgType, msgData))
}
func (d *DomainImpl) GetRandomOtherPeers(upToNumPeers int) []*cryptolib.PublicKey {
d.mutex.RLock()
defer d.mutex.RUnlock()
if upToNumPeers > len(d.permPubKeys) {
upToNumPeers = len(d.permPubKeys)
}
ret := make([]*cryptolib.PublicKey, upToNumPeers)
for i := 0; i < upToNumPeers; {
ret[i] = d.permPubKeys[d.permutation.NextNoCycles()]
distinct := true
for j := 0; j < i && distinct; j++ {
if ret[i].Equals(ret[j]) {
distinct = false
}
}
if distinct {
i++
}
}
return ret
}
func (d *DomainImpl) UpdatePeers(newPeerPubKeys []*cryptolib.PublicKey) {
d.mutex.RLock()
oldPeers := make(map[cryptolib.PublicKeyKey]peering.PeerSender) // A copy, to avoid keeping the lock.
for k, v := range d.nodes {
oldPeers[k] = v
}
d.mutex.RUnlock()
nodes := make(map[cryptolib.PublicKeyKey]peering.PeerSender) // Will collect the new set of nodes.
changed := false
//
// Add new peers.
for _, newPeerPubKey := range newPeerPubKeys {
if _, isOldPeer := oldPeers[newPeerPubKey.AsKey()]; isOldPeer {
continue // Old peers will be retained bellow.
}
newPeerSender, err := d.netProvider.PeerByPubKey(newPeerPubKey)
if err != nil {
d.log.Warnf("Domain peer skipped for now, pubKey=%v not found, reason: %v", newPeerPubKey.String(), err)
continue
}
changed = true
nodes[newPeerSender.PubKey().AsKey()] = newPeerSender
d.log.Infof("Domain peer added, pubKey=%v, peeringURL=%v", newPeerSender.PubKey().String(), newPeerSender.PeeringURL())
}
//
// Remove peers that are not needed anymore and retain others.
for _, oldPeer := range oldPeers {
oldPeerDropped := true
if oldPeer.PubKey().Equals(d.netProvider.Self().PubKey()) {
// We retain the current node in the domain all the time.
nodes[oldPeer.PubKey().AsKey()] = oldPeer
oldPeerDropped = false
} else {
for _, newPeerPubKey := range newPeerPubKeys {
if oldPeer.PubKey().Equals(newPeerPubKey) {
nodes[oldPeer.PubKey().AsKey()] = oldPeer
oldPeerDropped = false
break
}
}
}
if oldPeerDropped {
changed = true
d.log.Infof("Domain peer removed, pubKey=%v, peeringURL=%v", oldPeer.PubKey().String(), oldPeer.PeeringURL())
}
}
if changed {
d.mutex.Lock()
d.nodes = nodes
d.initPermPubKeys()
d.mutex.Unlock()
}
}
func (d *DomainImpl) ReshufflePeers() {
d.mutex.Lock()
defer d.mutex.Unlock()
d.permutation.Shuffle()
}
func (d *DomainImpl) initPermPubKeys() {
d.permPubKeys = make([]*cryptolib.PublicKey, 0, len(d.nodes))
for _, sender := range d.nodes {
if !sender.PubKey().Equals(d.netProvider.Self().PubKey()) { // Do not include self to the permutation.
d.permPubKeys = append(d.permPubKeys, sender.PubKey())
}
}
var err error
d.permutation, err = util.NewPermutation16(uint16(len(d.permPubKeys)))
if err != nil {
d.log.Warnf("Error generating cryptographically secure random domains permutation: %v", err)
}
}
func (d *DomainImpl) Attach(receiver byte, callback func(recv *peering.PeerMessageIn)) context.CancelFunc {
unhook := d.netProvider.Attach(&d.peeringID, receiver, func(recv *peering.PeerMessageIn) {
if recv.SenderPubKey.Equals(d.netProvider.Self().PubKey()) {
d.log.Debugf("dropping message for receiver=%v MsgType=%v from %v: message from self.",
recv.MsgReceiver, recv.MsgType, recv.SenderPubKey.String())
return
}
_, ok := d.nodes[recv.SenderPubKey.AsKey()]
if !ok {
d.log.Warnf("dropping message for receiver=%v MsgType=%v from %v: it does not belong to the peer domain.",
recv.MsgReceiver, recv.MsgType, recv.SenderPubKey.String())
return
}
callback(recv)
})
d.unhookFuncs = append(d.unhookFuncs, unhook)
return unhook
}
func (d *DomainImpl) PeerStatus() []peering.PeerStatusProvider {
res := make([]peering.PeerStatusProvider, 0)
for _, v := range d.nodes {
res = append(res, v.Status())
}
return res
}
func (d *DomainImpl) Close() {
for _, unhook := range d.unhookFuncs {
util.ExecuteIfNotNil(unhook)
}
for i := range d.nodes {
d.nodes[i].Close()
}
}