-
Notifications
You must be signed in to change notification settings - Fork 1
/
comm.go
776 lines (668 loc) · 23.2 KB
/
comm.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
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
/*
Copyright IBM Corp. 2017 All Rights Reserved.
SPDX-License-Identifier: Apache-2.0
*/
package cluster
import (
"bytes"
"context"
"crypto/x509"
"encoding/pem"
"fmt"
"sync"
"sync/atomic"
"time"
"github.com/golang/protobuf/proto"
"github.com/hyperledger/fabric/common/flogging"
"github.com/hyperledger/fabric/core/comm"
"github.com/hyperledger/fabric/protos/orderer"
"github.com/pkg/errors"
"go.uber.org/zap"
"google.golang.org/grpc"
"google.golang.org/grpc/connectivity"
)
const (
// MinimumExpirationWarningInterval is the default minimum time interval
// between consecutive warnings about certificate expiration.
MinimumExpirationWarningInterval = time.Minute * 5
)
var (
errOverflow = errors.New("send queue overflown")
errAborted = errors.New("aborted")
errTimeout = errors.New("rpc timeout expired")
)
// ChannelExtractor extracts the channel of a given message,
// or returns an empty string if that's not possible
type ChannelExtractor interface {
TargetChannel(message proto.Message) string
}
//go:generate mockery -dir . -name Handler -case underscore -output ./mocks/
// Handler handles Step() and Submit() requests and returns a corresponding response
type Handler interface {
OnConsensus(channel string, sender uint64, req *orderer.ConsensusRequest) error
OnSubmit(channel string, sender uint64, req *orderer.SubmitRequest) error
}
// RemoteNode represents a cluster member
type RemoteNode struct {
// ID is unique among all members, and cannot be 0.
ID uint64
// Endpoint is the endpoint of the node, denoted in %s:%d format
Endpoint string
// ServerTLSCert is the DER encoded TLS server certificate of the node
ServerTLSCert []byte
// ClientTLSCert is the DER encoded TLS client certificate of the node
ClientTLSCert []byte
}
// String returns a string representation of this RemoteNode
func (rm RemoteNode) String() string {
return fmt.Sprintf("ID: %d,\nEndpoint: %s,\nServerTLSCert:%s, ClientTLSCert:%s",
rm.ID, rm.Endpoint, DERtoPEM(rm.ServerTLSCert), DERtoPEM(rm.ClientTLSCert))
}
//go:generate mockery -dir . -name Communicator -case underscore -output ./mocks/
// Communicator defines communication for a consenter
type Communicator interface {
// Remote returns a RemoteContext for the given RemoteNode ID in the context
// of the given channel, or error if connection cannot be established, or
// the channel wasn't configured
Remote(channel string, id uint64) (*RemoteContext, error)
// Configure configures the communication to connect to all
// given members, and disconnect from any members not among the given
// members.
Configure(channel string, members []RemoteNode)
// Shutdown shuts down the communicator
Shutdown()
}
// MembersByChannel is a mapping from channel name
// to MemberMapping
type MembersByChannel map[string]MemberMapping
// Comm implements Communicator
type Comm struct {
MinimumExpirationWarningInterval time.Duration
CertExpWarningThreshold time.Duration
shutdownSignal chan struct{}
shutdown bool
SendBufferSize int
Lock sync.RWMutex
Logger *flogging.FabricLogger
ChanExt ChannelExtractor
H Handler
Connections *ConnectionStore
Chan2Members MembersByChannel
Metrics *Metrics
CompareCertificate CertificateComparator
}
type requestContext struct {
channel string
sender uint64
}
// DispatchSubmit identifies the channel and sender of the submit request and passes it
// to the underlying Handler
func (c *Comm) DispatchSubmit(ctx context.Context, request *orderer.SubmitRequest) error {
reqCtx, err := c.requestContext(ctx, request)
if err != nil {
return err
}
return c.H.OnSubmit(reqCtx.channel, reqCtx.sender, request)
}
// DispatchConsensus identifies the channel and sender of the step request and passes it
// to the underlying Handler
func (c *Comm) DispatchConsensus(ctx context.Context, request *orderer.ConsensusRequest) error {
reqCtx, err := c.requestContext(ctx, request)
if err != nil {
return err
}
return c.H.OnConsensus(reqCtx.channel, reqCtx.sender, request)
}
// classifyRequest identifies the sender and channel of the request and returns
// it wrapped in a requestContext
func (c *Comm) requestContext(ctx context.Context, msg proto.Message) (*requestContext, error) {
channel := c.ChanExt.TargetChannel(msg)
if channel == "" {
return nil, errors.Errorf("badly formatted message, cannot extract channel")
}
c.Lock.RLock()
mapping, exists := c.Chan2Members[channel]
c.Lock.RUnlock()
if !exists {
return nil, errors.Errorf("channel %s doesn't exist", channel)
}
cert := comm.ExtractRawCertificateFromContext(ctx)
if len(cert) == 0 {
return nil, errors.Errorf("no TLS certificate sent")
}
stub := mapping.LookupByClientCert(cert)
if stub == nil {
return nil, errors.Errorf("certificate extracted from TLS connection isn't authorized")
}
return &requestContext{
channel: channel,
sender: stub.ID,
}, nil
}
// Remote obtains a RemoteContext linked to the destination node on the context
// of a given channel
func (c *Comm) Remote(channel string, id uint64) (*RemoteContext, error) {
c.Lock.RLock()
defer c.Lock.RUnlock()
if c.shutdown {
return nil, errors.New("communication has been shut down")
}
mapping, exists := c.Chan2Members[channel]
if !exists {
return nil, errors.Errorf("channel %s doesn't exist", channel)
}
stub := mapping.ByID(id)
if stub == nil {
return nil, errors.Errorf("node %d doesn't exist in channel %s's membership", id, channel)
}
if stub.Active() {
return stub.RemoteContext, nil
}
err := stub.Activate(c.createRemoteContext(stub, channel))
if err != nil {
return nil, errors.WithStack(err)
}
return stub.RemoteContext, nil
}
// Configure configures the channel with the given RemoteNodes
func (c *Comm) Configure(channel string, newNodes []RemoteNode) {
c.Logger.Infof("Entering, channel: %s, nodes: %v", channel, newNodes)
defer c.Logger.Infof("Exiting")
c.Lock.Lock()
defer c.Lock.Unlock()
c.createShutdownSignalIfNeeded()
if c.shutdown {
return
}
beforeConfigChange := c.serverCertsInUse()
// Update the channel-scoped mapping with the new nodes
c.applyMembershipConfig(channel, newNodes)
// Close connections to nodes that are not present in the new membership
c.cleanUnusedConnections(beforeConfigChange)
}
func (c *Comm) createShutdownSignalIfNeeded() {
if c.shutdownSignal == nil {
c.shutdownSignal = make(chan struct{})
}
}
// Shutdown shuts down the instance
func (c *Comm) Shutdown() {
c.Lock.Lock()
defer c.Lock.Unlock()
c.createShutdownSignalIfNeeded()
if !c.shutdown {
close(c.shutdownSignal)
}
c.shutdown = true
for _, members := range c.Chan2Members {
members.Foreach(func(id uint64, stub *Stub) {
c.Connections.Disconnect(stub.ServerTLSCert)
})
}
}
// cleanUnusedConnections disconnects all connections that are un-used
// at the moment of the invocation
func (c *Comm) cleanUnusedConnections(serverCertsBeforeConfig StringSet) {
// Scan all nodes after the reconfiguration
serverCertsAfterConfig := c.serverCertsInUse()
// Filter out the certificates that remained after the reconfiguration
serverCertsBeforeConfig.subtract(serverCertsAfterConfig)
// Close the connections to all these nodes as they shouldn't be in use now
for serverCertificate := range serverCertsBeforeConfig {
c.Connections.Disconnect([]byte(serverCertificate))
}
}
// serverCertsInUse returns the server certificates that are in use
// represented as strings.
func (c *Comm) serverCertsInUse() StringSet {
endpointsInUse := make(StringSet)
for _, mapping := range c.Chan2Members {
endpointsInUse.union(mapping.ServerCertificates())
}
return endpointsInUse
}
// applyMembershipConfig sets the given RemoteNodes for the given channel
func (c *Comm) applyMembershipConfig(channel string, newNodes []RemoteNode) {
mapping := c.getOrCreateMapping(channel)
newNodeIDs := make(map[uint64]struct{})
for _, node := range newNodes {
newNodeIDs[node.ID] = struct{}{}
c.updateStubInMapping(channel, mapping, node)
}
// Remove all stubs without a corresponding node
// in the new nodes
mapping.Foreach(func(id uint64, stub *Stub) {
if _, exists := newNodeIDs[id]; exists {
c.Logger.Info(id, "exists in both old and new membership for channel", channel, ", skipping its deactivation")
return
}
c.Logger.Info("Deactivated node", id, "who's endpoint is", stub.Endpoint, "as it's removed from membership")
mapping.Remove(id)
stub.Deactivate()
})
}
// updateStubInMapping updates the given RemoteNode and adds it to the MemberMapping
func (c *Comm) updateStubInMapping(channel string, mapping MemberMapping, node RemoteNode) {
stub := mapping.ByID(node.ID)
if stub == nil {
c.Logger.Info("Allocating a new stub for node", node.ID, "with endpoint of", node.Endpoint, "for channel", channel)
stub = &Stub{}
}
// Check if the TLS server certificate of the node is replaced
// and if so - then deactivate the stub, to trigger
// a re-creation of its gRPC connection
if !bytes.Equal(stub.ServerTLSCert, node.ServerTLSCert) {
c.Logger.Info("Deactivating node", node.ID, "in channel", channel,
"with endpoint of", node.Endpoint, "due to TLS certificate change")
stub.Deactivate()
}
// Overwrite the stub Node data with the new data
stub.RemoteNode = node
// Put the stub into the mapping
mapping.Put(stub)
// Check if the stub needs activation.
if stub.Active() {
return
}
// Activate the stub
stub.Activate(c.createRemoteContext(stub, channel))
}
// createRemoteStub returns a function that creates a RemoteContext.
// It is used as a parameter to Stub.Activate() in order to activate
// a stub atomically.
func (c *Comm) createRemoteContext(stub *Stub, channel string) func() (*RemoteContext, error) {
return func() (*RemoteContext, error) {
cert, err := x509.ParseCertificate(stub.ServerTLSCert)
if err != nil {
pemString := string(pem.EncodeToMemory(&pem.Block{Bytes: stub.ServerTLSCert}))
c.Logger.Errorf("Invalid DER for channel %s, endpoint %s, ID %d: %v", channel, stub.Endpoint, stub.ID, pemString)
return nil, errors.Wrap(err, "invalid certificate DER")
}
c.Logger.Debug("Connecting to", stub.RemoteNode, "for channel", channel)
conn, err := c.Connections.Connection(stub.Endpoint, stub.ServerTLSCert)
if err != nil {
c.Logger.Warningf("Unable to obtain connection to %d(%s) (channel %s): %v", stub.ID, stub.Endpoint, channel, err)
return nil, err
}
probeConnection := func(conn *grpc.ClientConn) error {
connState := conn.GetState()
if connState == connectivity.Connecting {
return errors.Errorf("connection to %d(%s) is in state %s", stub.ID, stub.Endpoint, connState)
}
return nil
}
clusterClient := orderer.NewClusterClient(conn)
workerCountReporter := workerCountReporter{
channel: channel,
}
rc := &RemoteContext{
expiresAt: cert.NotAfter,
minimumExpirationWarningInterval: c.MinimumExpirationWarningInterval,
certExpWarningThreshold: c.CertExpWarningThreshold,
workerCountReporter: workerCountReporter,
Channel: channel,
Metrics: c.Metrics,
SendBuffSize: c.SendBufferSize,
shutdownSignal: c.shutdownSignal,
endpoint: stub.Endpoint,
Logger: c.Logger,
ProbeConn: probeConnection,
conn: conn,
Client: clusterClient,
}
return rc, nil
}
}
// getOrCreateMapping creates a MemberMapping for the given channel
// or returns the existing one.
func (c *Comm) getOrCreateMapping(channel string) MemberMapping {
// Lazily create a mapping if it doesn't already exist
mapping, exists := c.Chan2Members[channel]
if !exists {
mapping = MemberMapping{
id2stub: make(map[uint64]*Stub),
SamePublicKey: c.CompareCertificate,
}
c.Chan2Members[channel] = mapping
}
return mapping
}
// Stub holds all information about the remote node,
// including the RemoteContext for it, and serializes
// some operations on it.
type Stub struct {
lock sync.RWMutex
RemoteNode
*RemoteContext
}
// Active returns whether the Stub
// is active or not
func (stub *Stub) Active() bool {
stub.lock.RLock()
defer stub.lock.RUnlock()
return stub.isActive()
}
// Active returns whether the Stub
// is active or not.
func (stub *Stub) isActive() bool {
return stub.RemoteContext != nil
}
// Deactivate deactivates the Stub and
// ceases all communication operations
// invoked on it.
func (stub *Stub) Deactivate() {
stub.lock.Lock()
defer stub.lock.Unlock()
if !stub.isActive() {
return
}
stub.RemoteContext.Abort()
stub.RemoteContext = nil
}
// Activate creates a remote context with the given function callback
// in an atomic manner - if two parallel invocations are invoked on this Stub,
// only a single invocation of createRemoteStub takes place.
func (stub *Stub) Activate(createRemoteContext func() (*RemoteContext, error)) error {
stub.lock.Lock()
defer stub.lock.Unlock()
// Check if the stub has already been activated while we were waiting for the lock
if stub.isActive() {
return nil
}
remoteStub, err := createRemoteContext()
if err != nil {
return errors.WithStack(err)
}
stub.RemoteContext = remoteStub
return nil
}
// RemoteContext interacts with remote cluster
// nodes. Every call can be aborted via call to Abort()
type RemoteContext struct {
expiresAt time.Time
minimumExpirationWarningInterval time.Duration
certExpWarningThreshold time.Duration
Metrics *Metrics
Channel string
SendBuffSize int
shutdownSignal chan struct{}
Logger *flogging.FabricLogger
endpoint string
Client orderer.ClusterClient
ProbeConn func(conn *grpc.ClientConn) error
conn *grpc.ClientConn
nextStreamID uint64
streamsByID streamsMapperReporter
workerCountReporter workerCountReporter
}
// Stream is used to send/receive messages to/from the remote cluster member.
type Stream struct {
abortChan <-chan struct{}
sendBuff chan *orderer.StepRequest
commShutdown chan struct{}
abortReason *atomic.Value
metrics *Metrics
ID uint64
Channel string
NodeName string
Endpoint string
Logger *flogging.FabricLogger
Timeout time.Duration
orderer.Cluster_StepClient
Cancel func(error)
canceled *uint32
expCheck *certificateExpirationCheck
}
// StreamOperation denotes an operation done by a stream, such a Send or Receive.
type StreamOperation func() (*orderer.StepResponse, error)
// Canceled returns whether the stream was canceled.
func (stream *Stream) Canceled() bool {
return atomic.LoadUint32(stream.canceled) == uint32(1)
}
// Send sends the given request to the remote cluster member.
func (stream *Stream) Send(request *orderer.StepRequest) error {
if stream.Canceled() {
return errors.New(stream.abortReason.Load().(string))
}
var allowDrop bool
// We want to drop consensus transactions if the remote node cannot keep up with us,
// otherwise we'll slow down the entire FSM.
if request.GetConsensusRequest() != nil {
allowDrop = true
}
return stream.sendOrDrop(request, allowDrop)
}
// sendOrDrop sends the given request to the remote cluster member, or drops it
// if it is a consensus request and the queue is full.
func (stream *Stream) sendOrDrop(request *orderer.StepRequest, allowDrop bool) error {
msgType := "transaction"
if allowDrop {
msgType = "consensus"
}
stream.metrics.reportQueueOccupancy(stream.Endpoint, msgType, stream.Channel, len(stream.sendBuff), cap(stream.sendBuff))
if allowDrop && len(stream.sendBuff) == cap(stream.sendBuff) {
stream.Cancel(errOverflow)
stream.metrics.reportMessagesDropped(stream.Endpoint, stream.Channel)
return errOverflow
}
select {
case <-stream.abortChan:
return errors.Errorf("stream %d aborted", stream.ID)
case stream.sendBuff <- request:
return nil
case <-stream.commShutdown:
return nil
}
}
// sendMessage sends the request down the stream
func (stream *Stream) sendMessage(request *orderer.StepRequest) {
start := time.Now()
var err error
defer func() {
if !stream.Logger.IsEnabledFor(zap.DebugLevel) {
return
}
var result string
if err != nil {
result = fmt.Sprintf("but failed due to %s", err.Error())
}
stream.Logger.Debugf("Send of %s to %s(%s) took %v %s", requestAsString(request),
stream.NodeName, stream.Endpoint, time.Since(start), result)
}()
f := func() (*orderer.StepResponse, error) {
startSend := time.Now()
stream.expCheck.checkExpiration(startSend, stream.Channel)
err := stream.Cluster_StepClient.Send(request)
stream.metrics.reportMsgSendTime(stream.Endpoint, stream.Channel, time.Since(startSend))
return nil, err
}
_, err = stream.operateWithTimeout(f)
}
func (stream *Stream) serviceStream() {
defer stream.Cancel(errAborted)
for {
select {
case msg := <-stream.sendBuff:
stream.sendMessage(msg)
case <-stream.abortChan:
return
case <-stream.commShutdown:
return
}
}
}
// Recv receives a message from a remote cluster member.
func (stream *Stream) Recv() (*orderer.StepResponse, error) {
start := time.Now()
defer func() {
if !stream.Logger.IsEnabledFor(zap.DebugLevel) {
return
}
stream.Logger.Debugf("Receive from %s(%s) took %v", stream.NodeName, stream.Endpoint, time.Since(start))
}()
f := func() (*orderer.StepResponse, error) {
return stream.Cluster_StepClient.Recv()
}
return stream.operateWithTimeout(f)
}
// operateWithTimeout performs the given operation on the stream, and blocks until the timeout expires.
func (stream *Stream) operateWithTimeout(invoke StreamOperation) (*orderer.StepResponse, error) {
timer := time.NewTimer(stream.Timeout)
defer timer.Stop()
var operationEnded sync.WaitGroup
operationEnded.Add(1)
responseChan := make(chan struct {
res *orderer.StepResponse
err error
}, 1)
go func() {
defer operationEnded.Done()
res, err := invoke()
responseChan <- struct {
res *orderer.StepResponse
err error
}{res: res, err: err}
}()
select {
case r := <-responseChan:
if r.err != nil {
stream.Cancel(r.err)
}
return r.res, r.err
case <-timer.C:
stream.Logger.Warningf("Stream %d to %s(%s) was forcibly terminated because timeout (%v) expired",
stream.ID, stream.NodeName, stream.Endpoint, stream.Timeout)
stream.Cancel(errTimeout)
// Wait for the operation goroutine to end
operationEnded.Wait()
return nil, errTimeout
}
}
func requestAsString(request *orderer.StepRequest) string {
switch t := request.GetPayload().(type) {
case *orderer.StepRequest_SubmitRequest:
if t.SubmitRequest == nil || t.SubmitRequest.Payload == nil {
return fmt.Sprintf("Empty SubmitRequest: %v", t.SubmitRequest)
}
return fmt.Sprintf("SubmitRequest for channel %s with payload of size %d",
t.SubmitRequest.Channel, len(t.SubmitRequest.Payload.Payload))
case *orderer.StepRequest_ConsensusRequest:
return fmt.Sprintf("ConsensusRequest for channel %s with payload of size %d",
t.ConsensusRequest.Channel, len(t.ConsensusRequest.Payload))
default:
return fmt.Sprintf("unknown type: %v", request)
}
}
// NewStream creates a new stream.
// It is not thread safe, and Send() or Recv() block only until the timeout expires.
func (rc *RemoteContext) NewStream(timeout time.Duration) (*Stream, error) {
if err := rc.ProbeConn(rc.conn); err != nil {
return nil, err
}
ctx, cancel := context.WithCancel(context.TODO())
stream, err := rc.Client.Step(ctx)
if err != nil {
cancel()
return nil, errors.WithStack(err)
}
streamID := atomic.AddUint64(&rc.nextStreamID, 1)
nodeName := commonNameFromContext(stream.Context())
var canceled uint32
abortChan := make(chan struct{})
abort := func() {
cancel()
rc.streamsByID.Delete(streamID)
rc.Metrics.reportEgressStreamCount(rc.Channel, atomic.LoadUint32(&rc.streamsByID.size))
rc.Logger.Debugf("Stream %d to %s(%s) is aborted", streamID, nodeName, rc.endpoint)
atomic.StoreUint32(&canceled, 1)
close(abortChan)
}
once := &sync.Once{}
abortReason := &atomic.Value{}
cancelWithReason := func(err error) {
abortReason.Store(err.Error())
once.Do(abort)
}
logger := flogging.MustGetLogger("orderer.common.cluster.step")
stepLogger := logger.WithOptions(zap.AddCallerSkip(1))
s := &Stream{
Channel: rc.Channel,
metrics: rc.Metrics,
abortReason: abortReason,
abortChan: abortChan,
sendBuff: make(chan *orderer.StepRequest, rc.SendBuffSize),
commShutdown: rc.shutdownSignal,
NodeName: nodeName,
Logger: stepLogger,
ID: streamID,
Endpoint: rc.endpoint,
Timeout: timeout,
Cluster_StepClient: stream,
Cancel: cancelWithReason,
canceled: &canceled,
}
s.expCheck = &certificateExpirationCheck{
minimumExpirationWarningInterval: rc.minimumExpirationWarningInterval,
expirationWarningThreshold: rc.certExpWarningThreshold,
expiresAt: rc.expiresAt,
endpoint: s.Endpoint,
nodeName: s.NodeName,
alert: func(template string, args ...interface{}) {
s.Logger.Warningf(template, args...)
},
}
rc.Logger.Debugf("Created new stream to %s with ID of %d and buffer size of %d",
rc.endpoint, streamID, cap(s.sendBuff))
rc.streamsByID.Store(streamID, s)
rc.Metrics.reportEgressStreamCount(rc.Channel, atomic.LoadUint32(&rc.streamsByID.size))
go func() {
rc.workerCountReporter.increment(s.metrics)
s.serviceStream()
rc.workerCountReporter.decrement(s.metrics)
}()
return s, nil
}
// Abort aborts the contexts the RemoteContext uses, thus effectively
// causes all operations that use this RemoteContext to terminate.
func (rc *RemoteContext) Abort() {
rc.streamsByID.Range(func(_, value interface{}) bool {
value.(*Stream).Cancel(errAborted)
return false
})
}
func commonNameFromContext(ctx context.Context) string {
cert := comm.ExtractCertificateFromContext(ctx)
if cert == nil {
return "unidentified node"
}
return cert.Subject.CommonName
}
type streamsMapperReporter struct {
size uint32
sync.Map
}
func (smr *streamsMapperReporter) Delete(key interface{}) {
smr.Map.Delete(key)
atomic.AddUint32(&smr.size, ^uint32(0))
}
func (smr *streamsMapperReporter) Store(key, value interface{}) {
smr.Map.Store(key, value)
atomic.AddUint32(&smr.size, 1)
}
type workerCountReporter struct {
channel string
workerCount uint32
}
func (wcr *workerCountReporter) increment(m *Metrics) {
count := atomic.AddUint32(&wcr.workerCount, 1)
m.reportWorkerCount(wcr.channel, count)
}
func (wcr *workerCountReporter) decrement(m *Metrics) {
// ^0 flips all zeros to ones, which means
// 2^32 - 1, and then we add this number wcr.workerCount.
// It follows from commutativity of the unsigned integers group
// that wcr.workerCount + 2^32 - 1 = wcr.workerCount - 1 + 2^32
// which is just wcr.workerCount - 1.
count := atomic.AddUint32(&wcr.workerCount, ^uint32(0))
m.reportWorkerCount(wcr.channel, count)
}