BFT Block Puller: BFTDeliverer

- A BFTDeliverer that fetches blocks and maintains a BFTCensorshipMonitor.
- Abstract the creation of a BFTCensorshipMonitor via an abstract factory, so that we can use a mock for it in testing.
- Add a "shuffledEndpoints" method to the connection source and test it.
- Unit testing of BFTDeliverer.

Signed-off-by: Yoav Tock <tock@il.ibm.com>
Change-Id: Ifead3f9e6c803c4d9fabc63acce11c6da472b88d

internal/pkg/peer/blocksprovider/bft_censorship_monitor.go

@@ -43,7 +43,7 @@ type DeliverClientRequester interface {
 // We track the progress of header receivers against the block reception progress.
 // If there is a header that is ahead of the last block, and a timeout had passed since that header was received, we
 // declare that censorship was detected.
-// When censorship is detected, errCensorship is sent to the errorCh which can be read by ErrorsChannel() method.
+// When censorship is detected, ErrCensorship is sent to the errorCh which can be read by ErrorsChannel() method.
 type BFTCensorshipMonitor struct {
 	chainID          string
 	headerVerifier   BlockVerifier
@@ -163,19 +163,19 @@ func (m *BFTCensorshipMonitor) Monitor() {
 	for {
 		if err := m.launchHeaderReceivers(); err != nil {
 			m.logger.Warningf("Failure while launching header receivers: %s", err)
-			m.errorCh <- &errFatal{message: err.Error()}
+			m.errorCh <- &ErrFatal{Message: err.Error()}
 			m.Stop()
 			return
 		}
 
 		select {
 		case <-m.stopCh:
-			m.errorCh <- &errStopping{message: "received a stop signal"}
+			m.errorCh <- &ErrStopping{Message: "received a stop signal"}
 			return
 		case <-time.After(m.timeoutConfig.BlockCensorshipTimeout / 100):
 			if m.detectBlockCensorship() {
 				m.logger.Warningf("Block censorship detected, block source endpoint: %s", m.fetchSources[m.blockSourceIndex])
-				m.errorCh <- &errCensorship{message: fmt.Sprintf("block censorship detected, endpoint: %s", m.fetchSources[m.blockSourceIndex])}
+				m.errorCh <- &ErrCensorship{Message: fmt.Sprintf("block censorship detected, endpoint: %s", m.fetchSources[m.blockSourceIndex])}
 				m.Stop()
 				return
 			}

internal/pkg/peer/blocksprovider/bft_censorship_monitor_factory.go

@@ -0,0 +1,25 @@
+/*
+Copyright IBM Corp. All Rights Reserved.
+
+SPDX-License-Identifier: Apache-2.0
+*/
+
+package blocksprovider
+
+import "github.com/hyperledger/fabric/internal/pkg/peer/orderers"
+
+// BFTCensorshipMonitorFactory creates an instance of a BFTCensorshipMonitor. It is an implementation of the
+// CensorshipDetectorFactory interface which abstracts the creation of a BFTCensorshipMonitor.
+type BFTCensorshipMonitorFactory struct{}
+
+func (f *BFTCensorshipMonitorFactory) Create(
+	chainID string,
+	verifier BlockVerifier,
+	requester DeliverClientRequester,
+	progressReporter BlockProgressReporter,
+	fetchSources []*orderers.Endpoint,
+	blockSourceIndex int,
+	timeoutConf TimeoutConfig,
+) CensorshipDetector {
+	return NewBFTCensorshipMonitor(chainID, verifier, requester, progressReporter, fetchSources, blockSourceIndex, timeoutConf)
+}

internal/pkg/peer/blocksprovider/bft_censorship_monitor_factory_test.go

@@ -0,0 +1,21 @@
+/*
+Copyright IBM Corp. All Rights Reserved.
+
+SPDX-License-Identifier: Apache-2.0
+*/
+
+package blocksprovider_test
+
+import (
+	"testing"
+
+	"github.com/hyperledger/fabric/internal/pkg/peer/blocksprovider"
+	"github.com/stretchr/testify/require"
+)
+
+func TestNewBFTCensorshipMonitorFactory(t *testing.T) {
+	s := newMonitorTestSetup(t, 5)
+	f := &blocksprovider.BFTCensorshipMonitorFactory{}
+	mon := f.Create(s.channelID, s.fakeBlockVerifier, s.fakeRequester, s.fakeProgressReporter, s.sources, 0, blocksprovider.TimeoutConfig{})
+	require.NotNil(t, mon)
+}

internal/pkg/peer/blocksprovider/bft_censorship_monitor_test.go

@@ -171,7 +171,7 @@ func TestBFTCensorshipMonitor_NoHeadersNoBlocks(t *testing.T) {
 
 	require.Eventually(t, func() bool { return s.fakeRequester.SeekInfoHeadersFromCallCount() == 3 }, 5*time.Second, 10*time.Millisecond)
 	require.Eventually(t, func() bool { return s.fakeRequester.ConnectCallCount() == 3 }, 5*time.Second, 10*time.Millisecond)
-	require.Eventually(t, func() bool { return s.fakeProgressReporter.BlockProgressCallCount() == 9 }, 5*time.Second, 10*time.Millisecond)
+	require.Eventually(t, func() bool { return s.fakeProgressReporter.BlockProgressCallCount() >= 9 }, 5*time.Second, 10*time.Millisecond)
 	for i := 0; i < s.fakeRequester.ConnectCallCount(); i++ {
 		n := s.fakeRequester.SeekInfoHeadersFromArgsForCall(i)
 		require.Equal(t, uint64(0), n)