-
Notifications
You must be signed in to change notification settings - Fork 0
/
client.go
515 lines (467 loc) · 13.4 KB
/
client.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
package net
import (
"context"
"errors"
"fmt"
nnet "net"
"sync"
"time"
"github.com/dcnetio/gothreads-lib/cbor"
core "github.com/dcnetio/gothreads-lib/core/net"
"github.com/dcnetio/gothreads-lib/core/thread"
sym "github.com/dcnetio/gothreads-lib/crypto/symmetric"
"github.com/dcnetio/gothreads-lib/logstore/lstoreds"
pb "github.com/dcnetio/gothreads-lib/net/pb"
"github.com/gogo/status"
gostream "github.com/libp2p/go-libp2p-gostream"
"github.com/libp2p/go-libp2p/core/peer"
pstore "github.com/libp2p/go-libp2p/core/peerstore"
ma "github.com/multiformats/go-multiaddr"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/connectivity"
)
var (
// DialTimeout is the max time duration to wait when dialing a peer.
DialTimeout = time.Second * 20
PushTimeout = time.Second * 20
PullTimeout = time.Second * 20
)
// getLogs in a thread.
func (s *server) getLogs(ctx context.Context, id thread.ID, pid peer.ID) ([]thread.LogInfo, error) {
sk, err := s.net.store.ServiceKey(id)
if err != nil {
return nil, err
}
if sk == nil {
return nil, fmt.Errorf("a service-key is required to request logs")
}
body := &pb.GetLogsRequest_Body{
ThreadID: &pb.ProtoThreadID{ID: id},
ServiceKey: &pb.ProtoKey{Key: sk},
}
req := &pb.GetLogsRequest{
Body: body,
}
log.Debugf("getting %s logs from %s...", id, pid)
client, err := s.dial(pid)
if err != nil {
return nil, err
}
cctx, cancel := context.WithTimeout(ctx, PullTimeout)
defer cancel()
reply, err := client.GetLogs(cctx, req)
if err != nil {
log.Warnf("get logs from %s failed: %s", pid, err)
return nil, err
}
log.Debugf("received %d logs from %s", len(reply.Logs), pid)
lgs := make([]thread.LogInfo, len(reply.Logs))
for i, l := range reply.Logs {
lgs[i] = logFromProto(l)
}
return lgs, nil
}
// pushLog to a peer.
func (s *server) pushLog(ctx context.Context, id thread.ID, lg thread.LogInfo, pid peer.ID, sk *sym.Key, rk *sym.Key) error {
body := &pb.PushLogRequest_Body{
ThreadID: &pb.ProtoThreadID{ID: id},
Log: logToProto(lg),
}
if sk != nil {
body.ServiceKey = &pb.ProtoKey{Key: sk}
}
if rk != nil {
body.ReadKey = &pb.ProtoKey{Key: rk}
}
lreq := &pb.PushLogRequest{
Body: body,
}
log.Debugf("pushing log %s to %s...", lg.ID, pid)
client, err := s.dial(pid)
if err != nil {
return fmt.Errorf("dial %s failed: %w", pid, err)
}
cctx, cancel := context.WithTimeout(ctx, PushTimeout)
defer cancel()
_, err = client.PushLog(cctx, lreq)
if err != nil {
return fmt.Errorf("push log to %s failed: %w", pid, err)
}
return err
}
// getRecords from specified peers.
func (s *server) getRecords(
peers []peer.ID,
tid thread.ID,
offsets map[peer.ID]thread.Head,
limit uint,
) (map[peer.ID]peerRecords, error) {
req, sk, err := s.buildGetRecordsRequest(tid, offsets, limit)
if err != nil {
return nil, err
}
var (
rc = newRecordCollector()
wg sync.WaitGroup
)
getted := make(chan struct{})
// Pull from every peer
for _, p := range peers {
wg.Add(1)
go withErrLog(p, func(pid peer.ID) error {
defer wg.Done()
return s.net.queueGetRecords.Call(pid, tid, func(ctx context.Context, pid peer.ID, tid thread.ID) error {
recs, err := s.getRecordsFromPeer(ctx, tid, pid, req, sk)
if err != nil {
return err
}
for lid, rs := range recs {
rc.UpdateHeadCounter(lid, rs.counter)
for _, rec := range rs.records {
rc.Store(lid, rec)
}
}
if len(recs) == int(limit) { // If we got the max number of records, we're done
getted <- struct{}{}
}
return nil
})
})
}
go func() {
wg.Wait()
close(getted)
}()
select {
case <-getted:
case <-time.After(PullTimeout):
}
return rc.List()
}
func (s *server) buildGetRecordsRequest(
tid thread.ID,
offsets map[peer.ID]thread.Head,
limit uint,
) (req *pb.GetRecordsRequest, serviceKey *sym.Key, err error) {
serviceKey, err = s.net.store.ServiceKey(tid)
if err != nil {
err = fmt.Errorf("obtaining service key: %w", err)
return
} else if serviceKey == nil {
err = errors.New("a service-key is required to request records")
return
}
var pblgs = make([]*pb.GetRecordsRequest_Body_LogEntry, 0, len(offsets))
for lid, offset := range offsets {
pblgs = append(pblgs, &pb.GetRecordsRequest_Body_LogEntry{
LogID: &pb.ProtoPeerID{ID: lid},
Offset: &pb.ProtoCid{Cid: offset.ID},
Limit: int32(limit),
Counter: offset.Counter,
})
}
body := &pb.GetRecordsRequest_Body{
ThreadID: &pb.ProtoThreadID{ID: tid},
ServiceKey: &pb.ProtoKey{Key: serviceKey},
Logs: pblgs,
}
req = &pb.GetRecordsRequest{
Body: body,
}
return
}
type peerRecords struct {
records []core.Record
counter int64
}
// Send GetRecords request to a certain peer.
func (s *server) getRecordsFromPeer(
ctx context.Context,
tid thread.ID,
pid peer.ID,
req *pb.GetRecordsRequest,
serviceKey *sym.Key,
) (map[peer.ID]peerRecords, error) {
log.Debugf("getting records from %s...", pid)
client, err := s.dial(pid)
if err != nil {
return nil, fmt.Errorf("dial %s failed: %w", pid, err)
}
recs := make(map[peer.ID]peerRecords)
cctx, cancel := context.WithTimeout(ctx, PullTimeout)
defer cancel()
reply, err := client.GetRecords(cctx, req)
if err != nil {
log.Warnf("get records from %s failed: %s", pid, err)
return recs, nil
}
for _, l := range reply.Logs {
var logID = l.LogID.ID
log.Debugf("received %d records in log %s from %s", len(l.Records), logID, pid)
if l.Log != nil && len(l.Log.Addrs) > 0 {
if err = s.net.store.AddAddrs(tid, logID, addrsFromProto(l.Log.Addrs), pstore.PermanentAddrTTL); err != nil {
return nil, err
}
}
pk, err := s.net.store.PubKey(tid, logID)
if err != nil {
return nil, err
}
if pk == nil {
if l.Log == nil || l.Log.PubKey == nil {
// cannot verify received records
continue
}
if err := s.net.store.AddPubKey(tid, logID, l.Log.PubKey); err != nil {
return nil, err
}
pk = l.Log.PubKey
}
var records []core.Record
for _, r := range l.Records {
rec, err := cbor.RecordFromProto(r, serviceKey)
if err != nil {
return nil, err
}
if err = rec.Verify(pk); err != nil {
return nil, err
}
records = append(records, rec)
}
counter := thread.CounterUndef
// Old version may still send nil Logs, because of how
// old server GetRecords method worked, now it is fixed
// but we can still have crashes if we don't check this for backwards compatibility
if l.Log != nil {
counter = l.Log.Counter
}
recs[logID] = peerRecords{
records: records,
counter: counter,
}
}
return recs, nil
}
// pushRecord to log addresses and thread topic.
func (s *server) pushRecord(ctx context.Context, tid thread.ID, lid peer.ID, rec core.Record, counter int64) error {
// Collect known writers
addrs := make([]ma.Multiaddr, 0)
info, err := s.net.store.GetThread(tid)
if err != nil {
return err
}
for _, l := range info.Logs {
addrs = append(addrs, l.Addrs...)
}
peers, err := s.net.uniquePeers(addrs)
if err != nil {
return err
}
// Get addresses from external object
if s.net.threadExternal != nil {
resPeers, err := s.net.threadExternal.GetPeers(ctx, tid)
if err == nil && len(resPeers) > 0 {
peers = resPeers
}
}
pbrec, err := cbor.RecordToProto(ctx, s.net, rec)
if err != nil {
return err
}
body := &pb.PushRecordRequest_Body{
ThreadID: &pb.ProtoThreadID{ID: tid},
LogID: &pb.ProtoPeerID{ID: lid},
Record: pbrec,
}
req := &pb.PushRecordRequest{
Body: body,
Counter: counter,
}
// Push to each address
for _, p := range peers {
if p.String() == "" {
continue
}
go func(pid peer.ID) {
if err := s.pushRecordToPeer(req, pid, tid, lid); err != nil {
log.Errorf("pushing record to %s (thread: %s, log: %s) failed: %v", pid, tid, lid, err)
}
}(p)
}
return nil
}
func (s *server) pushRecordToPeer(
req *pb.PushRecordRequest,
pid peer.ID,
tid thread.ID,
lid peer.ID,
) error {
client, err := s.dial(pid)
if err != nil {
return fmt.Errorf("dial failed: %w", err)
}
rctx, cancel := context.WithTimeout(context.Background(), PushTimeout)
defer cancel()
_, err = client.PushRecord(rctx, req)
if err == nil {
return nil
}
switch status.Convert(err).Code() {
case codes.Unavailable:
log.Debugf("%s unavailable, skip pushing the record", pid)
return nil
case codes.NotFound:
// send the missing log
lctx, cancel := context.WithTimeout(s.net.ctx, PushTimeout)
defer cancel()
lg, err := s.net.store.GetLog(tid, lid)
if err != nil {
return fmt.Errorf("getting log information: %w", err)
}
body := &pb.PushLogRequest_Body{
ThreadID: &pb.ProtoThreadID{ID: tid},
Log: logToProto(lg),
}
lreq := &pb.PushLogRequest{
Body: body,
}
if _, err = client.PushLog(lctx, lreq); err != nil {
return fmt.Errorf("pushing missing log: %w", err)
}
return nil
default:
return err
}
}
// exchangeEdges of specified threads with a peer.
func (s *server) exchangeEdges(ctx context.Context, pid peer.ID, tids []thread.ID) error {
log.Debugf("exchanging edges of %d threads with %s...", len(tids), pid)
var body = &pb.ExchangeEdgesRequest_Body{}
// fill local edges
for _, tid := range tids {
switch addrsEdge, headsEdge, err := s.localEdges(tid); err {
// we have lstoreds.EmptyEdgeValue for headsEdge and addrsEdge if we get errors below
case errNoAddrsEdge, errNoHeadsEdge, nil:
body.Threads = append(body.Threads, &pb.ExchangeEdgesRequest_Body_ThreadEntry{
ThreadID: &pb.ProtoThreadID{ID: tid},
HeadsEdge: headsEdge,
AddressEdge: addrsEdge,
})
default:
log.Errorf("getting local edges for %s failed: %v", tid, err)
}
}
if len(body.Threads) == 0 {
return nil
}
req := &pb.ExchangeEdgesRequest{
Body: body,
}
// send request
client, err := s.dial(pid)
if err != nil {
return fmt.Errorf("dial %s failed: %w", pid, err)
}
cctx, cancel := context.WithTimeout(ctx, PullTimeout)
defer cancel()
reply, err := client.ExchangeEdges(cctx, req)
if err != nil {
if st, ok := status.FromError(err); ok {
switch st.Code() {
case codes.Unimplemented:
log.Debugf("%s doesn't support edge exchange, falling back to direct record pulling", pid)
for _, tid := range tids {
if s.net.queueGetRecords.Schedule(pid, tid, callPriorityLow, s.net.updateRecordsFromPeer) {
log.Debugf("record update for thread %s from %s scheduled", tid, pid)
}
}
return nil
case codes.Unavailable:
log.Debugf("%s unavailable, skip edge exchange", pid)
return nil
}
}
return err
}
for _, e := range reply.GetEdges() {
tid := e.ThreadID.ID
// get local edges potentially updated by another process
addrsEdgeLocal, headsEdgeLocal, err := s.localEdges(tid)
// we allow local edges to be empty, because the other peer can still have more information
if err != nil && err != errNoHeadsEdge && err != errNoAddrsEdge {
log.Errorf("second retrieval of local edges for %s failed: %v", tid, err)
continue
}
responseEdge := e.GetAddressEdge()
// We only update the logs if we got non empty values and different hashes for addresses
// Note that previous versions also sent 0 (aka EmptyEdgeValue) values when the addresses
// were non-existent, so it shouldn't break backwards compatibility
if responseEdge != lstoreds.EmptyEdgeValue && responseEdge != addrsEdgeLocal {
if s.net.queueGetLogs.Schedule(pid, tid, callPriorityLow, s.net.updateLogsFromPeer) {
log.Debugf("log information update for thread %s from %s scheduled", tid, pid)
}
}
responseEdge = e.GetHeadsEdge()
// We only update the records if we got non empty values and different hashes for heads
if responseEdge != lstoreds.EmptyEdgeValue && responseEdge != headsEdgeLocal {
if s.net.queueGetRecords.Schedule(pid, tid, callPriorityLow, s.net.updateRecordsFromPeer) {
log.Debugf("record update for thread %s from %s scheduled", tid, pid)
}
}
}
return nil
}
// dial attempts to open a gRPC connection over libp2p to a peer.
func (s *server) dial(peerID peer.ID) (pb.ServiceClient, error) {
s.Lock()
conn, ok := s.conns[peerID]
if ok {
if conn.GetState() == connectivity.Shutdown {
if err := conn.Close(); err != nil && status.Code(err) != codes.Canceled {
log.Errorf("error closing connection: %v", err)
}
} else {
s.Unlock()
return pb.NewServiceClient(conn), nil
}
}
s.Unlock()
ctx, cancel := context.WithTimeout(context.Background(), DialTimeout)
defer cancel()
conn, err := grpc.DialContext(ctx, peerID.String(), s.opts...)
if err != nil {
//The connection failed. Try to use external objects to assist in processing and then connect again.
if s.net.threadExternal != nil && s.net.threadExternal.ConnectToPeer(ctx, s.net.host, peerID) {
conn, err = grpc.DialContext(ctx, peerID.String(), s.opts...)
if err != nil {
return nil, err
}
} else {
return nil, err
}
}
s.Lock()
defer s.Unlock()
s.conns[peerID] = conn
return pb.NewServiceClient(conn), nil
}
// getLibp2pDialer returns a WithContextDialer option for libp2p dialing.
func (s *server) getLibp2pDialer() grpc.DialOption {
return grpc.WithContextDialer(func(ctx context.Context, peerIDStr string) (nnet.Conn, error) {
id, err := peer.Decode(peerIDStr)
if err != nil {
return nil, fmt.Errorf("grpc tried to dial non peerID: %w", err)
}
conn, err := gostream.Dial(ctx, s.net.host, id, thread.Protocol)
if err != nil {
return nil, fmt.Errorf("gostream dial failed: %w", err)
}
return conn, nil
})
}
func withErrLog(pid peer.ID, f func(pid peer.ID) error) {
if err := f(pid); err != nil {
log.Error(err.Error())
}
}