forked from ipfs/kubo
-
Notifications
You must be signed in to change notification settings - Fork 0
/
wantmanager.go
302 lines (259 loc) · 6.33 KB
/
wantmanager.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
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
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
package bitswap
import (
"sync"
"time"
key "github.com/ipfs/go-ipfs/blocks/key"
engine "github.com/ipfs/go-ipfs/exchange/bitswap/decision"
bsmsg "github.com/ipfs/go-ipfs/exchange/bitswap/message"
bsnet "github.com/ipfs/go-ipfs/exchange/bitswap/network"
wantlist "github.com/ipfs/go-ipfs/exchange/bitswap/wantlist"
peer "gx/ipfs/QmZwZjMVGss5rqYsJVGy18gNbkTJffFyq2x1uJ4e4p3ZAt/go-libp2p-peer"
context "gx/ipfs/QmZy2y8t9zQH2a1b8q2ZSLKp17ATuJoCNxxyMFG5qFExpt/go-net/context"
)
type WantManager struct {
// sync channels for Run loop
incoming chan []*bsmsg.Entry
connect chan peer.ID // notification channel for new peers connecting
disconnect chan peer.ID // notification channel for peers disconnecting
peerReqs chan chan []peer.ID // channel to request connected peers on
// synchronized by Run loop, only touch inside there
peers map[peer.ID]*msgQueue
wl *wantlist.ThreadSafe
network bsnet.BitSwapNetwork
ctx context.Context
}
func NewWantManager(ctx context.Context, network bsnet.BitSwapNetwork) *WantManager {
return &WantManager{
incoming: make(chan []*bsmsg.Entry, 10),
connect: make(chan peer.ID, 10),
disconnect: make(chan peer.ID, 10),
peerReqs: make(chan chan []peer.ID),
peers: make(map[peer.ID]*msgQueue),
wl: wantlist.NewThreadSafe(),
network: network,
ctx: ctx,
}
}
type msgPair struct {
to peer.ID
msg bsmsg.BitSwapMessage
}
type cancellation struct {
who peer.ID
blk key.Key
}
type msgQueue struct {
p peer.ID
outlk sync.Mutex
out bsmsg.BitSwapMessage
network bsnet.BitSwapNetwork
refcnt int
work chan struct{}
done chan struct{}
}
func (pm *WantManager) WantBlocks(ks []key.Key) {
log.Infof("want blocks: %s", ks)
pm.addEntries(ks, false)
}
func (pm *WantManager) CancelWants(ks []key.Key) {
pm.addEntries(ks, true)
}
func (pm *WantManager) addEntries(ks []key.Key, cancel bool) {
var entries []*bsmsg.Entry
for i, k := range ks {
entries = append(entries, &bsmsg.Entry{
Cancel: cancel,
Entry: wantlist.Entry{
Key: k,
Priority: kMaxPriority - i,
},
})
}
select {
case pm.incoming <- entries:
case <-pm.ctx.Done():
}
}
func (pm *WantManager) ConnectedPeers() []peer.ID {
resp := make(chan []peer.ID)
pm.peerReqs <- resp
return <-resp
}
func (pm *WantManager) SendBlock(ctx context.Context, env *engine.Envelope) {
// Blocks need to be sent synchronously to maintain proper backpressure
// throughout the network stack
defer env.Sent()
msg := bsmsg.New(false)
msg.AddBlock(env.Block)
log.Infof("Sending block %s to %s", env.Peer, env.Block)
err := pm.network.SendMessage(ctx, env.Peer, msg)
if err != nil {
log.Infof("sendblock error: %s", err)
}
}
func (pm *WantManager) startPeerHandler(p peer.ID) *msgQueue {
mq, ok := pm.peers[p]
if ok {
mq.refcnt++
return nil
}
mq = pm.newMsgQueue(p)
// new peer, we will want to give them our full wantlist
fullwantlist := bsmsg.New(true)
for _, e := range pm.wl.Entries() {
fullwantlist.AddEntry(e.Key, e.Priority)
}
mq.out = fullwantlist
mq.work <- struct{}{}
pm.peers[p] = mq
go mq.runQueue(pm.ctx)
return mq
}
func (pm *WantManager) stopPeerHandler(p peer.ID) {
pq, ok := pm.peers[p]
if !ok {
// TODO: log error?
return
}
pq.refcnt--
if pq.refcnt > 0 {
return
}
close(pq.done)
delete(pm.peers, p)
}
func (mq *msgQueue) runQueue(ctx context.Context) {
for {
select {
case <-mq.work: // there is work to be done
mq.doWork(ctx)
case <-mq.done:
return
case <-ctx.Done():
return
}
}
}
func (mq *msgQueue) doWork(ctx context.Context) {
// allow ten minutes for connections
// this includes looking them up in the dht
// dialing them, and handshaking
conctx, cancel := context.WithTimeout(ctx, time.Minute*10)
defer cancel()
err := mq.network.ConnectTo(conctx, mq.p)
if err != nil {
log.Infof("cant connect to peer %s: %s", mq.p, err)
// TODO: cant connect, what now?
return
}
// grab outgoing message
mq.outlk.Lock()
wlm := mq.out
if wlm == nil || wlm.Empty() {
mq.outlk.Unlock()
return
}
mq.out = nil
mq.outlk.Unlock()
sendctx, cancel := context.WithTimeout(ctx, time.Minute*5)
defer cancel()
// send wantlist updates
err = mq.network.SendMessage(sendctx, mq.p, wlm)
if err != nil {
log.Infof("bitswap send error: %s", err)
// TODO: what do we do if this fails?
return
}
}
func (pm *WantManager) Connected(p peer.ID) {
select {
case pm.connect <- p:
case <-pm.ctx.Done():
}
}
func (pm *WantManager) Disconnected(p peer.ID) {
select {
case pm.disconnect <- p:
case <-pm.ctx.Done():
}
}
// TODO: use goprocess here once i trust it
func (pm *WantManager) Run() {
tock := time.NewTicker(rebroadcastDelay.Get())
defer tock.Stop()
for {
select {
case entries := <-pm.incoming:
// add changes to our wantlist
for _, e := range entries {
if e.Cancel {
pm.wl.Remove(e.Key)
} else {
pm.wl.Add(e.Key, e.Priority)
}
}
// broadcast those wantlist changes
for _, p := range pm.peers {
p.addMessage(entries)
}
case <-tock.C:
// resend entire wantlist every so often (REALLY SHOULDNT BE NECESSARY)
var es []*bsmsg.Entry
for _, e := range pm.wl.Entries() {
es = append(es, &bsmsg.Entry{Entry: e})
}
for _, p := range pm.peers {
p.outlk.Lock()
p.out = bsmsg.New(true)
p.outlk.Unlock()
p.addMessage(es)
}
case p := <-pm.connect:
pm.startPeerHandler(p)
case p := <-pm.disconnect:
pm.stopPeerHandler(p)
case req := <-pm.peerReqs:
var peers []peer.ID
for p := range pm.peers {
peers = append(peers, p)
}
req <- peers
case <-pm.ctx.Done():
return
}
}
}
func (wm *WantManager) newMsgQueue(p peer.ID) *msgQueue {
mq := new(msgQueue)
mq.done = make(chan struct{})
mq.work = make(chan struct{}, 1)
mq.network = wm.network
mq.p = p
mq.refcnt = 1
return mq
}
func (mq *msgQueue) addMessage(entries []*bsmsg.Entry) {
mq.outlk.Lock()
defer func() {
mq.outlk.Unlock()
select {
case mq.work <- struct{}{}:
default:
}
}()
// if we have no message held, or the one we are given is full
// overwrite the one we are holding
if mq.out == nil {
mq.out = bsmsg.New(false)
}
// TODO: add a msg.Combine(...) method
// otherwise, combine the one we are holding with the
// one passed in
for _, e := range entries {
if e.Cancel {
mq.out.Cancel(e.Key)
} else {
mq.out.AddEntry(e.Key, e.Priority)
}
}
}