lnd.xprv/discovery/sync_manager_test.go

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2019-03-23 05:56:03 +03:00
package discovery
import (
"fmt"
"math"
"reflect"
"sync/atomic"
"testing"
"time"
"github.com/davecgh/go-spew/spew"
"github.com/lightningnetwork/lnd/lntest"
"github.com/lightningnetwork/lnd/lnwire"
"github.com/lightningnetwork/lnd/ticker"
)
// randPeer creates a random peer.
func randPeer(t *testing.T, quit chan struct{}) *mockPeer {
t.Helper()
return &mockPeer{
pk: randPubKey(t),
sentMsgs: make(chan lnwire.Message),
quit: quit,
}
}
// newTestSyncManager creates a new test SyncManager using mock implementations
// of its dependencies.
func newTestSyncManager(numActiveSyncers int) *SyncManager {
hID := lnwire.ShortChannelID{BlockHeight: latestKnownHeight}
return newSyncManager(&SyncManagerCfg{
ChanSeries: newMockChannelGraphTimeSeries(hID),
RotateTicker: ticker.NewForce(DefaultSyncerRotationInterval),
HistoricalSyncTicker: ticker.NewForce(DefaultHistoricalSyncInterval),
NumActiveSyncers: numActiveSyncers,
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})
}
// TestSyncManagerNumActiveSyncers ensures that we are unable to have more than
// NumActiveSyncers active syncers.
func TestSyncManagerNumActiveSyncers(t *testing.T) {
t.Parallel()
// We'll start by creating our test sync manager which will hold up to
// 3 active syncers.
const numActiveSyncers = 3
const numSyncers = numActiveSyncers + 1
syncMgr := newTestSyncManager(numActiveSyncers)
syncMgr.Start()
defer syncMgr.Stop()
// We'll go ahead and create our syncers. We'll gather the ones which
// should be active and passive to check them later on.
for i := 0; i < numActiveSyncers; i++ {
peer := randPeer(t, syncMgr.quit)
syncMgr.InitSyncState(peer)
s := assertSyncerExistence(t, syncMgr, peer)
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// The first syncer registered always attempts a historical
// sync.
if i == 0 {
assertTransitionToChansSynced(t, s, peer)
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}
assertActiveGossipTimestampRange(t, peer)
assertSyncerStatus(t, s, chansSynced, ActiveSync)
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}
for i := 0; i < numSyncers-numActiveSyncers; i++ {
peer := randPeer(t, syncMgr.quit)
syncMgr.InitSyncState(peer)
s := assertSyncerExistence(t, syncMgr, peer)
assertSyncerStatus(t, s, chansSynced, PassiveSync)
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}
}
// TestSyncManagerNewActiveSyncerAfterDisconnect ensures that we can regain an
// active syncer after losing one due to the peer disconnecting.
func TestSyncManagerNewActiveSyncerAfterDisconnect(t *testing.T) {
t.Parallel()
// We'll create our test sync manager to have two active syncers.
syncMgr := newTestSyncManager(2)
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syncMgr.Start()
defer syncMgr.Stop()
// The first will be an active syncer that performs a historical sync
// since it is the first one registered with the SyncManager.
historicalSyncPeer := randPeer(t, syncMgr.quit)
syncMgr.InitSyncState(historicalSyncPeer)
historicalSyncer := assertSyncerExistence(t, syncMgr, historicalSyncPeer)
assertTransitionToChansSynced(t, historicalSyncer, historicalSyncPeer)
assertActiveGossipTimestampRange(t, historicalSyncPeer)
assertSyncerStatus(t, historicalSyncer, chansSynced, ActiveSync)
// Then, we'll create the second active syncer, which is the one we'll
// disconnect.
activeSyncPeer := randPeer(t, syncMgr.quit)
syncMgr.InitSyncState(activeSyncPeer)
activeSyncer := assertSyncerExistence(t, syncMgr, activeSyncPeer)
assertActiveGossipTimestampRange(t, activeSyncPeer)
assertSyncerStatus(t, activeSyncer, chansSynced, ActiveSync)
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// It will then be torn down to simulate a disconnection. Since there
// are no other candidate syncers available, the active syncer won't be
// replaced.
syncMgr.PruneSyncState(activeSyncPeer.PubKey())
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// Then, we'll start our active syncer again, but this time we'll also
// have a passive syncer available to replace the active syncer after
// the peer disconnects.
syncMgr.InitSyncState(activeSyncPeer)
activeSyncer = assertSyncerExistence(t, syncMgr, activeSyncPeer)
assertActiveGossipTimestampRange(t, activeSyncPeer)
assertSyncerStatus(t, activeSyncer, chansSynced, ActiveSync)
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// Create our second peer, which should be initialized as a passive
// syncer.
newActiveSyncPeer := randPeer(t, syncMgr.quit)
syncMgr.InitSyncState(newActiveSyncPeer)
newActiveSyncer := assertSyncerExistence(t, syncMgr, newActiveSyncPeer)
assertSyncerStatus(t, newActiveSyncer, chansSynced, PassiveSync)
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// Disconnect our active syncer, which should trigger the SyncManager to
// replace it with our passive syncer.
go syncMgr.PruneSyncState(activeSyncPeer.PubKey())
assertPassiveSyncerTransition(t, newActiveSyncer, newActiveSyncPeer)
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}
// TestSyncManagerRotateActiveSyncerCandidate tests that we can successfully
// rotate our active syncers after a certain interval.
func TestSyncManagerRotateActiveSyncerCandidate(t *testing.T) {
t.Parallel()
// We'll create our sync manager with three active syncers.
syncMgr := newTestSyncManager(1)
syncMgr.Start()
defer syncMgr.Stop()
// The first syncer registered always performs a historical sync.
activeSyncPeer := randPeer(t, syncMgr.quit)
syncMgr.InitSyncState(activeSyncPeer)
activeSyncer := assertSyncerExistence(t, syncMgr, activeSyncPeer)
assertTransitionToChansSynced(t, activeSyncer, activeSyncPeer)
assertActiveGossipTimestampRange(t, activeSyncPeer)
assertSyncerStatus(t, activeSyncer, chansSynced, ActiveSync)
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// We'll send a tick to force a rotation. Since there aren't any
// candidates, none of the active syncers will be rotated.
syncMgr.cfg.RotateTicker.(*ticker.Force).Force <- time.Time{}
assertNoMsgSent(t, activeSyncPeer)
assertSyncerStatus(t, activeSyncer, chansSynced, ActiveSync)
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// We'll then go ahead and add a passive syncer.
passiveSyncPeer := randPeer(t, syncMgr.quit)
syncMgr.InitSyncState(passiveSyncPeer)
passiveSyncer := assertSyncerExistence(t, syncMgr, passiveSyncPeer)
assertSyncerStatus(t, passiveSyncer, chansSynced, PassiveSync)
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// We'll force another rotation - this time, since we have a passive
// syncer available, they should be rotated.
syncMgr.cfg.RotateTicker.(*ticker.Force).Force <- time.Time{}
// The transition from an active syncer to a passive syncer causes the
// peer to send out a new GossipTimestampRange in the past so that they
// don't receive new graph updates.
assertActiveSyncerTransition(t, activeSyncer, activeSyncPeer)
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// The transition from a passive syncer to an active syncer causes the
// peer to send a new GossipTimestampRange with the current timestamp to
// signal that they would like to receive new graph updates from their
// peers. This will also cause the gossip syncer to redo its state
// machine, starting from its initial syncingChans state. We'll then
// need to transition it to its final chansSynced state to ensure the
// next syncer is properly started in the round-robin.
assertPassiveSyncerTransition(t, passiveSyncer, passiveSyncPeer)
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}
// TestSyncManagerInitialHistoricalSync ensures that we only attempt a single
// historical sync during the SyncManager's startup. If the peer corresponding
// to the initial historical syncer disconnects, we should attempt to find a
// replacement.
func TestSyncManagerInitialHistoricalSync(t *testing.T) {
t.Parallel()
syncMgr := newTestSyncManager(0)
// The graph should not be considered as synced since the sync manager
// has yet to start.
if syncMgr.IsGraphSynced() {
t.Fatal("expected graph to not be considered as synced")
}
syncMgr.Start()
defer syncMgr.Stop()
// We should expect to see a QueryChannelRange message with a
// FirstBlockHeight of the genesis block, signaling that an initial
// historical sync is being attempted.
peer := randPeer(t, syncMgr.quit)
syncMgr.InitSyncState(peer)
assertMsgSent(t, peer, &lnwire.QueryChannelRange{
FirstBlockHeight: 0,
NumBlocks: math.MaxUint32,
})
// The graph should not be considered as synced since the initial
// historical sync has not finished.
if syncMgr.IsGraphSynced() {
t.Fatal("expected graph to not be considered as synced")
}
// If an additional peer connects, then another historical sync should
// not be attempted.
finalHistoricalPeer := randPeer(t, syncMgr.quit)
syncMgr.InitSyncState(finalHistoricalPeer)
finalHistoricalSyncer := assertSyncerExistence(t, syncMgr, finalHistoricalPeer)
assertNoMsgSent(t, finalHistoricalPeer)
// If we disconnect the peer performing the initial historical sync, a
// new one should be chosen.
syncMgr.PruneSyncState(peer.PubKey())
// Complete the initial historical sync by transitionining the syncer to
// its final chansSynced state. The graph should be considered as synced
// after the fact.
assertTransitionToChansSynced(t, finalHistoricalSyncer, finalHistoricalPeer)
if !syncMgr.IsGraphSynced() {
t.Fatal("expected graph to be considered as synced")
}
// Once the initial historical sync has succeeded, another one should
// not be attempted by disconnecting the peer who performed it.
extraPeer := randPeer(t, syncMgr.quit)
syncMgr.InitSyncState(extraPeer)
assertNoMsgSent(t, extraPeer)
syncMgr.PruneSyncState(finalHistoricalPeer.PubKey())
assertNoMsgSent(t, extraPeer)
}
// TestSyncManagerHistoricalSyncOnReconnect tests that the sync manager will
// re-trigger a historical sync when a new peer connects after a historical
// sync has completed, but we have lost all peers.
func TestSyncManagerHistoricalSyncOnReconnect(t *testing.T) {
t.Parallel()
syncMgr := newTestSyncManager(2)
syncMgr.Start()
defer syncMgr.Stop()
// We should expect to see a QueryChannelRange message with a
// FirstBlockHeight of the genesis block, signaling that an initial
// historical sync is being attempted.
peer := randPeer(t, syncMgr.quit)
syncMgr.InitSyncState(peer)
s := assertSyncerExistence(t, syncMgr, peer)
assertTransitionToChansSynced(t, s, peer)
assertActiveGossipTimestampRange(t, peer)
assertSyncerStatus(t, s, chansSynced, ActiveSync)
// Now that the historical sync is completed, we prune the syncer,
// simulating all peers having disconnected.
syncMgr.PruneSyncState(peer.PubKey())
// If a new peer now connects, then another historical sync should
// be attempted. This is to ensure we get an up-to-date graph if we
// haven't had any peers for a time.
nextPeer := randPeer(t, syncMgr.quit)
syncMgr.InitSyncState(nextPeer)
s1 := assertSyncerExistence(t, syncMgr, nextPeer)
assertTransitionToChansSynced(t, s1, nextPeer)
assertActiveGossipTimestampRange(t, nextPeer)
assertSyncerStatus(t, s1, chansSynced, ActiveSync)
}
// TestSyncManagerForceHistoricalSync ensures that we can perform routine
// historical syncs whenever the HistoricalSyncTicker fires.
func TestSyncManagerForceHistoricalSync(t *testing.T) {
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t.Parallel()
syncMgr := newTestSyncManager(0)
syncMgr.Start()
defer syncMgr.Stop()
// We should expect to see a QueryChannelRange message with a
// FirstBlockHeight of the genesis block, signaling that a historical
// sync is being attempted.
peer := randPeer(t, syncMgr.quit)
syncMgr.InitSyncState(peer)
assertMsgSent(t, peer, &lnwire.QueryChannelRange{
FirstBlockHeight: 0,
NumBlocks: math.MaxUint32,
})
// If an additional peer connects, then a historical sync should not be
// attempted again.
extraPeer := randPeer(t, syncMgr.quit)
syncMgr.InitSyncState(extraPeer)
assertNoMsgSent(t, extraPeer)
// Then, we'll send a tick to force a historical sync. This should
// trigger the extra peer to also perform a historical sync since the
// first peer is not eligible due to not being in a chansSynced state.
syncMgr.cfg.HistoricalSyncTicker.(*ticker.Force).Force <- time.Time{}
assertMsgSent(t, extraPeer, &lnwire.QueryChannelRange{
FirstBlockHeight: 0,
NumBlocks: math.MaxUint32,
})
}
// TestSyncManagerGraphSyncedAfterHistoricalSyncReplacement ensures that the
// sync manager properly marks the graph as synced given that our initial
// historical sync has stalled, but a replacement has fully completed.
func TestSyncManagerGraphSyncedAfterHistoricalSyncReplacement(t *testing.T) {
t.Parallel()
syncMgr := newTestSyncManager(0)
syncMgr.Start()
defer syncMgr.Stop()
// We should expect to see a QueryChannelRange message with a
// FirstBlockHeight of the genesis block, signaling that an initial
// historical sync is being attempted.
peer := randPeer(t, syncMgr.quit)
syncMgr.InitSyncState(peer)
assertMsgSent(t, peer, &lnwire.QueryChannelRange{
FirstBlockHeight: 0,
NumBlocks: math.MaxUint32,
})
// The graph should not be considered as synced since the initial
// historical sync has not finished.
if syncMgr.IsGraphSynced() {
t.Fatal("expected graph to not be considered as synced")
}
// If an additional peer connects, then another historical sync should
// not be attempted.
finalHistoricalPeer := randPeer(t, syncMgr.quit)
syncMgr.InitSyncState(finalHistoricalPeer)
finalHistoricalSyncer := assertSyncerExistence(t, syncMgr, finalHistoricalPeer)
assertNoMsgSent(t, finalHistoricalPeer)
// To simulate that our initial historical sync has stalled, we'll force
// a historical sync with the new peer to ensure it is replaced.
syncMgr.cfg.HistoricalSyncTicker.(*ticker.Force).Force <- time.Time{}
// The graph should still not be considered as synced since the
// replacement historical sync has not finished.
if syncMgr.IsGraphSynced() {
t.Fatal("expected graph to not be considered as synced")
}
// Complete the replacement historical sync by transitioning the syncer
// to its final chansSynced state. The graph should be considered as
// synced after the fact.
assertTransitionToChansSynced(t, finalHistoricalSyncer, finalHistoricalPeer)
if !syncMgr.IsGraphSynced() {
t.Fatal("expected graph to be considered as synced")
}
}
// TestSyncManagerWaitUntilInitialHistoricalSync ensures that no GossipSyncers
// are initialized as ActiveSync until the initial historical sync has been
// completed. Once it does, the pending GossipSyncers should be transitioned to
// ActiveSync.
func TestSyncManagerWaitUntilInitialHistoricalSync(t *testing.T) {
t.Parallel()
const numActiveSyncers = 2
// We'll start by creating our test sync manager which will hold up to
// 2 active syncers.
syncMgr := newTestSyncManager(numActiveSyncers)
syncMgr.Start()
defer syncMgr.Stop()
// We'll go ahead and create our syncers.
peers := make([]*mockPeer, 0, numActiveSyncers)
syncers := make([]*GossipSyncer, 0, numActiveSyncers)
for i := 0; i < numActiveSyncers; i++ {
peer := randPeer(t, syncMgr.quit)
peers = append(peers, peer)
syncMgr.InitSyncState(peer)
s := assertSyncerExistence(t, syncMgr, peer)
syncers = append(syncers, s)
// The first one always attempts a historical sync. We won't
// transition it to chansSynced to ensure the remaining syncers
// aren't started as active.
if i == 0 {
assertSyncerStatus(t, s, syncingChans, PassiveSync)
continue
}
// The rest should remain in a passive and chansSynced state,
// and they should be queued to transition to active once the
// initial historical sync is completed.
assertNoMsgSent(t, peer)
assertSyncerStatus(t, s, chansSynced, PassiveSync)
}
// To ensure we don't transition any pending active syncers that have
// previously disconnected, we'll disconnect the last one.
stalePeer := peers[numActiveSyncers-1]
syncMgr.PruneSyncState(stalePeer.PubKey())
// Then, we'll complete the initial historical sync by transitioning the
// historical syncer to its final chansSynced state. This should trigger
// all of the pending active syncers to transition, except for the one
// we disconnected.
assertTransitionToChansSynced(t, syncers[0], peers[0])
for i, s := range syncers {
if i == numActiveSyncers-1 {
assertNoMsgSent(t, peers[i])
continue
}
assertPassiveSyncerTransition(t, s, peers[i])
}
}
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// assertNoMsgSent is a helper function that ensures a peer hasn't sent any
// messages.
func assertNoMsgSent(t *testing.T, peer *mockPeer) {
t.Helper()
select {
case msg := <-peer.sentMsgs:
t.Fatalf("peer %x sent unexpected message %v", peer.PubKey(),
spew.Sdump(msg))
case <-time.After(time.Second):
}
}
// assertMsgSent asserts that the peer has sent the given message.
func assertMsgSent(t *testing.T, peer *mockPeer, msg lnwire.Message) {
t.Helper()
var msgSent lnwire.Message
select {
case msgSent = <-peer.sentMsgs:
case <-time.After(time.Second):
t.Fatalf("expected peer %x to send %T message", peer.PubKey(),
msg)
}
if !reflect.DeepEqual(msgSent, msg) {
t.Fatalf("expected peer %x to send message: %v\ngot: %v",
peer.PubKey(), spew.Sdump(msg), spew.Sdump(msgSent))
}
}
// assertActiveGossipTimestampRange is a helper function that ensures a peer has
// sent a lnwire.GossipTimestampRange message indicating that it would like to
// receive new graph updates.
func assertActiveGossipTimestampRange(t *testing.T, peer *mockPeer) {
t.Helper()
var msgSent lnwire.Message
select {
case msgSent = <-peer.sentMsgs:
case <-time.After(2 * time.Second):
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t.Fatalf("expected peer %x to send lnwire.GossipTimestampRange "+
"message", peer.PubKey())
}
msg, ok := msgSent.(*lnwire.GossipTimestampRange)
if !ok {
t.Fatalf("expected peer %x to send %T message", peer.PubKey(),
msg)
}
if msg.FirstTimestamp == 0 {
t.Fatalf("expected *lnwire.GossipTimestampRange message with " +
"non-zero FirstTimestamp")
}
if msg.TimestampRange == 0 {
t.Fatalf("expected *lnwire.GossipTimestampRange message with " +
"non-zero TimestampRange")
}
}
// assertSyncerExistence asserts that a GossipSyncer exists for the given peer.
func assertSyncerExistence(t *testing.T, syncMgr *SyncManager,
peer *mockPeer) *GossipSyncer {
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t.Helper()
s, ok := syncMgr.GossipSyncer(peer.PubKey())
if !ok {
t.Fatalf("gossip syncer for peer %x not found", peer.PubKey())
}
return s
}
// assertSyncerStatus asserts that the gossip syncer for the given peer matches
// the expected sync state and type.
func assertSyncerStatus(t *testing.T, s *GossipSyncer, syncState syncerState,
syncType SyncerType) {
t.Helper()
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// We'll check the status of our syncer within a WaitPredicate as some
// sync transitions might cause this to be racy.
err := lntest.WaitNoError(func() error {
state := s.syncState()
if s.syncState() != syncState {
return fmt.Errorf("expected syncState %v for peer "+
"%x, got %v", syncState, s.cfg.peerPub, state)
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}
typ := s.SyncType()
if s.SyncType() != syncType {
return fmt.Errorf("expected syncType %v for peer "+
"%x, got %v", syncType, s.cfg.peerPub, typ)
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}
return nil
}, time.Second)
if err != nil {
t.Fatal(err)
}
}
// assertTransitionToChansSynced asserts the transition of an ActiveSync
// GossipSyncer to its final chansSynced state.
func assertTransitionToChansSynced(t *testing.T, s *GossipSyncer, peer *mockPeer) {
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t.Helper()
assertMsgSent(t, peer, &lnwire.QueryChannelRange{
FirstBlockHeight: 0,
NumBlocks: math.MaxUint32,
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})
s.ProcessQueryMsg(&lnwire.ReplyChannelRange{Complete: 1}, nil)
chanSeries := s.cfg.channelSeries.(*mockChannelGraphTimeSeries)
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select {
case <-chanSeries.filterReq:
chanSeries.filterResp <- nil
case <-time.After(2 * time.Second):
t.Fatal("expected to receive FilterKnownChanIDs request")
}
err := lntest.WaitNoError(func() error {
state := syncerState(atomic.LoadUint32(&s.state))
if state != chansSynced {
return fmt.Errorf("expected syncerState %v, got %v",
chansSynced, state)
}
return nil
}, time.Second)
if err != nil {
t.Fatal(err)
}
}
// assertPassiveSyncerTransition asserts that a gossip syncer goes through all
// of its expected steps when transitioning from passive to active.
func assertPassiveSyncerTransition(t *testing.T, s *GossipSyncer, peer *mockPeer) {
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t.Helper()
assertActiveGossipTimestampRange(t, peer)
assertSyncerStatus(t, s, chansSynced, ActiveSync)
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}
// assertActiveSyncerTransition asserts that a gossip syncer goes through all of
// its expected steps when transitioning from active to passive.
func assertActiveSyncerTransition(t *testing.T, s *GossipSyncer, peer *mockPeer) {
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t.Helper()
assertMsgSent(t, peer, &lnwire.GossipTimestampRange{
FirstTimestamp: uint32(zeroTimestamp.Unix()),
TimestampRange: 0,
})
assertSyncerStatus(t, s, chansSynced, PassiveSync)
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}