-
Notifications
You must be signed in to change notification settings - Fork 337
/
puller.go
556 lines (477 loc) · 13.7 KB
/
puller.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
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
// Copyright 2020 The Swarm Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package puller provides protocol-orchestrating functionality
// over the pullsync protocol. It pulls chunks from other nodes
// and reacts to changes in network configuration.
package puller
import (
"context"
"fmt"
"math"
"sync"
"time"
"github.com/ethersphere/bee/pkg/intervalstore"
"github.com/ethersphere/bee/pkg/logging"
"github.com/ethersphere/bee/pkg/pullsync"
"github.com/ethersphere/bee/pkg/storage"
"github.com/ethersphere/bee/pkg/swarm"
"github.com/ethersphere/bee/pkg/topology"
)
var (
logMore = false // enable this to get more logging
)
type Options struct {
Bins uint8
}
type Puller struct {
topology topology.Driver
statestore storage.StateStorer
syncer pullsync.Interface
metrics metrics
logger logging.Logger
syncPeers []map[string]*syncPeer // index is bin, map key is peer address
syncPeersMtx sync.Mutex
cursors map[string][]uint64
cursorsMtx sync.Mutex
quit chan struct{}
wg sync.WaitGroup
bins uint8 // how many bins do we support
warmupTime time.Duration
}
func New(stateStore storage.StateStorer, topology topology.Driver, pullSync pullsync.Interface, logger logging.Logger, o Options, warmupTime time.Duration) *Puller {
var (
bins uint8 = swarm.MaxBins
)
if o.Bins != 0 {
bins = o.Bins
}
p := &Puller{
statestore: stateStore,
topology: topology,
syncer: pullSync,
metrics: newMetrics(),
logger: logger,
cursors: make(map[string][]uint64),
syncPeers: make([]map[string]*syncPeer, bins),
quit: make(chan struct{}),
wg: sync.WaitGroup{},
bins: bins,
warmupTime: warmupTime,
}
for i := uint8(0); i < bins; i++ {
p.syncPeers[i] = make(map[string]*syncPeer)
}
p.wg.Add(1)
go p.manage()
return p
}
type peer struct {
addr swarm.Address
po uint8
}
func (p *Puller) manage() {
defer p.wg.Done()
c, unsubscribe := p.topology.SubscribePeersChange()
defer unsubscribe()
ctx, cancel := context.WithCancel(context.Background())
go func() {
<-p.quit
cancel()
}()
// wait for warmup duration to complete
select {
case <-time.After(p.warmupTime):
case <-p.quit:
return
}
p.logger.Info("puller: warmup period complete, worker starting.")
for {
select {
case <-c:
// get all peers from kademlia
// iterate on entire bin at once (get all peers first)
// check how many intervals we synced with all of them
// pick the one with the most
// sync with that one
// if we're already syncing with this peer, make sure
// that we're syncing the correct bins according to depth
depth := p.topology.NeighborhoodDepth()
// we defer the actual start of syncing to get out of the iterator first
var (
peersToSync []peer
peersToRecalc []peer
peersDisconnected = make(map[string]peer)
)
p.syncPeersMtx.Lock()
// make a map of all peers we're syncing with, then remove from it
// the entries we get from kademlia in the iterator, this way we
// know which peers are no longer there anymore (disconnected) thus
// should be removed from the syncPeer bin.
for po, bin := range p.syncPeers {
for peerAddr, v := range bin {
pe := peer{addr: v.address, po: uint8(po)}
peersDisconnected[peerAddr] = pe
}
}
// EachPeerRev in this case will never return an error, since the content of the callback
// never returns an error. In case in the future changes are made to the callback in a
// way that it returns an error - the value must be checked.
_ = p.topology.EachPeerRev(func(peerAddr swarm.Address, po uint8) (stop, jumpToNext bool, err error) {
bp := p.syncPeers[po]
if po >= depth {
// delete from peersDisconnected since we'd like to sync
// with this peer
delete(peersDisconnected, peerAddr.ByteString())
// within depth, sync everything
if _, ok := bp[peerAddr.ByteString()]; !ok {
// we're not syncing with this peer yet, start doing so
bp[peerAddr.ByteString()] = newSyncPeer(peerAddr, p.bins)
peerEntry := peer{addr: peerAddr, po: po}
peersToSync = append(peersToSync, peerEntry)
} else {
// already syncing, recalc
peerEntry := peer{addr: peerAddr, po: po}
peersToRecalc = append(peersToRecalc, peerEntry)
}
}
// if peer is outside of depth, do nothing here, this
// will cause the peer to stay in the peersDisconnected
// map, leading to cancelling of its running syncing contexts.
return false, false, nil
})
p.syncPeersMtx.Unlock()
for _, v := range peersToSync {
p.syncPeer(ctx, v.addr, v.po, depth)
}
for _, v := range peersToRecalc {
dontSync := p.recalcPeer(ctx, v.addr, v.po, depth)
// stopgap solution for peers that dont return the correct
// amount of cursors we expect
if dontSync {
peersDisconnected[v.addr.ByteString()] = v
}
}
p.syncPeersMtx.Lock()
for _, v := range peersDisconnected {
p.disconnectPeer(v.addr, v.po)
}
p.syncPeersMtx.Unlock()
case <-p.quit:
return
}
}
}
func (p *Puller) disconnectPeer(peer swarm.Address, po uint8) {
if logMore {
p.logger.Debugf("puller disconnect cleanup peer %s po %d", peer, po)
}
if syncCtx, ok := p.syncPeers[po][peer.ByteString()]; ok {
// disconnectPeer is called under lock, this is safe
syncCtx.gone()
}
delete(p.syncPeers[po], peer.ByteString())
}
func (p *Puller) recalcPeer(ctx context.Context, peer swarm.Address, po, d uint8) (dontSync bool) {
if logMore {
p.logger.Debugf("puller recalculating peer %s po %d depth %d", peer, po, d)
}
p.syncPeersMtx.Lock()
syncCtx := p.syncPeers[po][peer.ByteString()]
p.syncPeersMtx.Unlock()
syncCtx.Lock()
defer syncCtx.Unlock()
p.cursorsMtx.Lock()
c := p.cursors[peer.ByteString()]
p.cursorsMtx.Unlock()
if len(c) != int(p.bins) {
return true
}
var want, dontWant []uint8
if po >= d {
// within depth
for i := d; i < p.bins; i++ {
if i == 0 {
continue
}
want = append(want, i)
}
for _, bin := range want {
if !syncCtx.isBinSyncing(bin) {
p.syncPeerBin(ctx, syncCtx, peer, bin, c[bin])
}
}
// cancel everything outside of depth
for i := uint8(0); i < d; i++ {
dontWant = append(dontWant, i)
}
} else {
// peer is outside depth. cancel everything
for i := uint8(0); i < p.bins; i++ {
dontWant = append(dontWant, i)
}
}
syncCtx.cancelBins(dontWant...)
return false
}
func (p *Puller) syncPeer(ctx context.Context, peer swarm.Address, po, d uint8) {
p.syncPeersMtx.Lock()
syncCtx := p.syncPeers[po][peer.ByteString()]
p.syncPeersMtx.Unlock()
syncCtx.Lock()
defer syncCtx.Unlock()
p.cursorsMtx.Lock()
c, ok := p.cursors[peer.ByteString()]
p.cursorsMtx.Unlock()
if !ok {
cursors, err := p.syncer.GetCursors(ctx, peer)
if err != nil {
if logMore {
p.logger.Debugf("could not get cursors from peer %s: %v", peer.String(), err)
}
p.syncPeersMtx.Lock()
delete(p.syncPeers[po], peer.ByteString())
p.syncPeersMtx.Unlock()
return
// remove from syncing peers list, trigger channel to find some other peer
// maybe blacklist for some time
}
p.cursorsMtx.Lock()
p.cursors[peer.ByteString()] = cursors
p.cursorsMtx.Unlock()
c = cursors
}
// if length of returned cursors does not add up to
// what we expect it to be - dont do anything
if len(c) != int(p.bins) {
p.syncPeersMtx.Lock()
delete(p.syncPeers[po], peer.ByteString())
p.syncPeersMtx.Unlock()
return
}
for bin, cur := range c {
if bin == 0 || uint8(bin) < d {
continue
}
p.syncPeerBin(ctx, syncCtx, peer, uint8(bin), cur)
}
}
func (p *Puller) syncPeerBin(ctx context.Context, syncCtx *syncPeer, peer swarm.Address, bin uint8, cur uint64) {
binCtx, cancel := context.WithCancel(ctx)
syncCtx.setBinCancel(cancel, bin)
if cur > 0 {
p.wg.Add(1)
go p.histSyncWorker(binCtx, peer, bin, cur)
}
// start live
p.wg.Add(1)
go p.liveSyncWorker(binCtx, peer, bin, cur)
}
func (p *Puller) histSyncWorker(ctx context.Context, peer swarm.Address, bin uint8, cur uint64) {
defer func() {
p.wg.Done()
p.metrics.HistWorkerDoneCounter.Inc()
}()
if logMore {
p.logger.Tracef("histSyncWorker starting, peer %s bin %d cursor %d", peer, bin, cur)
}
for {
p.metrics.HistWorkerIterCounter.Inc()
select {
case <-p.quit:
if logMore {
p.logger.Tracef("histSyncWorker quitting on shutdown. peer %s bin %d cur %d", peer, bin, cur)
}
return
case <-ctx.Done():
if logMore {
p.logger.Tracef("histSyncWorker context cancelled. peer %s bin %d cur %d", peer, bin, cur)
}
return
default:
}
s, _, _, err := p.nextPeerInterval(peer, bin)
if err != nil {
p.metrics.HistWorkerErrCounter.Inc()
p.logger.Debugf("histSyncWorker nextPeerInterval: %v", err)
return
}
if s > cur {
if logMore {
p.logger.Tracef("histSyncWorker finished syncing bin %d, cursor %d", bin, cur)
}
return
}
top, ruid, err := p.syncer.SyncInterval(ctx, peer, bin, s, cur)
if err != nil {
if logMore {
p.logger.Debugf("histSyncWorker error syncing interval. peer %s, bin %d, cursor %d, err %v", peer.String(), bin, cur, err)
}
if ruid == 0 {
p.metrics.HistWorkerErrCounter.Inc()
}
if err := p.syncer.CancelRuid(ctx, peer, ruid); err != nil && logMore {
p.logger.Debugf("histSyncWorker cancel ruid: %v", err)
}
return
}
err = p.addPeerInterval(peer, bin, s, top)
if err != nil {
p.metrics.HistWorkerErrCounter.Inc()
p.logger.Errorf("could not persist interval for peer %s, quitting", peer)
return
}
if logMore {
p.logger.Debugf("histSyncWorker pulled bin %d [%d:%d], peer %s", bin, s, top, peer)
}
}
}
func (p *Puller) liveSyncWorker(ctx context.Context, peer swarm.Address, bin uint8, cur uint64) {
defer p.wg.Done()
if logMore {
p.logger.Tracef("liveSyncWorker starting, peer %s bin %d cursor %d", peer, bin, cur)
}
from := cur + 1
for {
p.metrics.LiveWorkerIterCounter.Inc()
select {
case <-p.quit:
if logMore {
p.logger.Tracef("liveSyncWorker quit on shutdown. peer %s bin %d cur %d", peer, bin, cur)
}
return
case <-ctx.Done():
if logMore {
p.logger.Tracef("liveSyncWorker context cancelled. peer %s bin %d cur %d", peer, bin, cur)
}
return
default:
}
top, ruid, err := p.syncer.SyncInterval(ctx, peer, bin, from, math.MaxUint64)
if err != nil {
if logMore {
p.logger.Debugf("liveSyncWorker exit on sync error. peer %s bin %d from %d err %v", peer, bin, from, err)
}
if ruid == 0 {
p.metrics.LiveWorkerErrCounter.Inc()
}
if err := p.syncer.CancelRuid(ctx, peer, ruid); err != nil && logMore {
p.logger.Debugf("histSyncWorker cancel ruid: %v", err)
}
return
}
err = p.addPeerInterval(peer, bin, from, top)
if err != nil {
p.metrics.LiveWorkerErrCounter.Inc()
p.logger.Errorf("liveSyncWorker exit on add peer interval. peer %s bin %d from %d err %v", peer, bin, from, err)
return
}
if logMore {
p.logger.Debugf("liveSyncWorker pulled bin %d [%d:%d], peer %s", bin, from, top, peer)
}
from = top + 1
}
}
func (p *Puller) Close() error {
p.logger.Info("puller shutting down")
close(p.quit)
cc := make(chan struct{})
go func() {
defer close(cc)
p.wg.Wait()
}()
select {
case <-cc:
case <-time.After(10 * time.Second):
p.logger.Warning("puller shutting down with running goroutines")
}
return nil
}
func (p *Puller) addPeerInterval(peer swarm.Address, bin uint8, start, end uint64) (err error) {
peerStreamKey := peerIntervalKey(peer, bin)
i, err := p.getOrCreateInterval(peer, bin)
if err != nil {
return err
}
i.Add(start, end)
return p.statestore.Put(peerStreamKey, i)
}
func (p *Puller) nextPeerInterval(peer swarm.Address, bin uint8) (start, end uint64, empty bool, err error) {
i, err := p.getOrCreateInterval(peer, bin)
if err != nil {
return 0, 0, false, err
}
start, end, empty = i.Next(0)
return start, end, empty, nil
}
func (p *Puller) getOrCreateInterval(peer swarm.Address, bin uint8) (*intervalstore.Intervals, error) {
// check that an interval entry exists
key := peerIntervalKey(peer, bin)
i := &intervalstore.Intervals{}
err := p.statestore.Get(key, i)
switch err {
case nil:
case storage.ErrNotFound:
// key interval values are ALWAYS > 0
i = intervalstore.NewIntervals(1)
if err := p.statestore.Put(key, i); err != nil {
return nil, err
}
default:
return nil, fmt.Errorf("get peer interval: %w", err)
}
return i, nil
}
func peerIntervalKey(peer swarm.Address, bin uint8) string {
k := fmt.Sprintf("%s|%d", peer.String(), bin)
return k
}
type syncPeer struct {
address swarm.Address
binCancelFuncs map[uint8]func() // slice of context cancel funcs for historical sync. index is bin
sync.Mutex
}
func newSyncPeer(addr swarm.Address, bins uint8) *syncPeer {
return &syncPeer{
address: addr,
binCancelFuncs: make(map[uint8]func(), bins),
}
}
// called when peer disconnects or on shutdown, cleans up ongoing sync operations
func (p *syncPeer) gone() {
p.Lock()
defer p.Unlock()
for _, f := range p.binCancelFuncs {
f()
}
}
func (p *syncPeer) setBinCancel(cf func(), bin uint8) {
p.binCancelFuncs[bin] = cf
}
func (p *syncPeer) cancelBins(bins ...uint8) {
for _, bin := range bins {
if c, ok := p.binCancelFuncs[bin]; ok {
c()
delete(p.binCancelFuncs, bin)
}
}
}
func (p *syncPeer) isBinSyncing(bin uint8) bool {
_, ok := p.binCancelFuncs[bin]
return ok
}
func isSyncing(p *Puller, addr swarm.Address) bool {
// this is needed for testing purposes in order
// to verify that a peer is no longer syncing on
// disconnect
p.syncPeersMtx.Lock()
defer p.syncPeersMtx.Unlock()
for _, bin := range p.syncPeers {
for peer := range bin {
if addr.ByteString() == peer {
return true
}
}
}
return false
}