channeldb+lnwallet: store revocation log using the new format

This commit removes the usage of the old revocation log bucket and
starts to perform db operations using the new sub-bucket.

channeldb/channel.go

@@ -2306,7 +2306,7 @@ func (c *OpenChannel) InsertNextRevocation(revKey *btcec.PublicKey) error {
 // set of local updates that the peer still needs to send us a signature for.
 // We store this set of updates in case we go down.
 func (c *OpenChannel) AdvanceCommitChainTail(fwdPkg *FwdPkg,
-	updates []LogUpdate) error {
+	updates []LogUpdate, ourOutputIndex, theirOutputIndex uint32) error {
 
 	c.Lock()
 	defer c.Unlock()
@@ -2352,7 +2352,7 @@ func (c *OpenChannel) AdvanceCommitChainTail(fwdPkg *FwdPkg,
 		// TODO(roasbeef): could make the deltas relative, would save
 		// space, but then tradeoff for more disk-seeks to recover the
 		// full state.
-		logKey := revocationLogBucketDeprecated
+		logKey := revocationLogBucket
 		logBucket, err := chanBucket.CreateBucketIfNotExists(logKey)
 		if err != nil {
 			return err
@@ -2379,9 +2379,10 @@ func (c *OpenChannel) AdvanceCommitChainTail(fwdPkg *FwdPkg,
 
 		// With the commitment pointer swapped, we can now add the
 		// revoked (prior) state to the revocation log.
-		//
-		// TODO(roasbeef): store less
-		err = appendChannelLogEntry(logBucket, &c.RemoteCommitment)
+		err = putRevocationLog(
+			logBucket, &c.RemoteCommitment,
+			ourOutputIndex, theirOutputIndex,
+		)
 		if err != nil {
 			return err
 		}
@@ -2591,9 +2592,9 @@ func (c *OpenChannel) revocationLogTailCommitHeight() (uint64, error) {
 			return err
 		}
 
-		logBucket := chanBucket.NestedReadBucket(revocationLogBucketDeprecated)
-		if logBucket == nil {
-			return ErrNoPastDeltas
+		logBucket, err := fetchLogBucket(chanBucket)
+		if err != nil {
+			return err
 		}
 
 		// Once we have the bucket that stores the revocation log from
@@ -2654,11 +2655,15 @@ func (c *OpenChannel) CommitmentHeight() (uint64, error) {
 // intended to be used for obtaining the relevant data needed to claim all
 // funds rightfully spendable in the case of an on-chain broadcast of the
 // commitment transaction.
-func (c *OpenChannel) FindPreviousState(updateNum uint64) (*ChannelCommitment, error) {
+func (c *OpenChannel) FindPreviousState(
+	updateNum uint64) (*RevocationLog, *ChannelCommitment, error) {
+
 	c.RLock()
 	defer c.RUnlock()
 
-	var commit ChannelCommitment
+	commit := &ChannelCommitment{}
+	rl := &RevocationLog{}
+
 	err := kvdb.View(c.Db.backend, func(tx kvdb.RTx) error {
 		chanBucket, err := fetchChanBucket(
 			tx, c.IdentityPub, &c.FundingOutpoint, c.ChainHash,
@@ -2667,24 +2672,24 @@ func (c *OpenChannel) FindPreviousState(updateNum uint64) (*ChannelCommitment, e
 			return err
 		}
 
-		logBucket := chanBucket.NestedReadBucket(revocationLogBucketDeprecated)
-		if logBucket == nil {
-			return ErrNoPastDeltas
-		}
-
-		c, err := fetchOldRevocationLog(logBucket, updateNum)
+		// Find the revocation log from both the new and the old
+		// bucket.
+		r, c, err := fetchRevocationLogCompatible(chanBucket, updateNum)
 		if err != nil {
 			return err
 		}
 
+		rl = r
 		commit = c
 		return nil
 	}, func() {})
 	if err != nil {
-		return nil, err
+		return nil, nil, err
 	}
 
-	return &commit, nil
+	// Either the `rl` or the `commit` is nil here. We return them as-is
+	// and leave it to the caller to decide its following action.
+	return rl, commit, nil
 }
 
 // ClosureType is an enum like structure that details exactly _how_ a channel
@@ -2881,13 +2886,9 @@ func (c *OpenChannel) CloseChannel(summary *ChannelCloseSummary,
 
 		// With the base channel data deleted, attempt to delete the
 		// information stored within the revocation log.
-		logBucket := chanBucket.NestedReadWriteBucket(revocationLogBucketDeprecated)
-		if logBucket != nil {
-			err = chanBucket.DeleteNestedBucket(revocationLogBucketDeprecated)
-			if err != nil {
+		if err := deleteLogBucket(chanBucket); err != nil {
 			return err
 		}
-		}
 
 		err = chainBucket.DeleteNestedBucket(chanPointBuf.Bytes())
 		if err != nil {
@@ -3643,19 +3644,6 @@ func makeLogKey(updateNum uint64) [8]byte {
 	return key
 }
 
-// TODO: delete
-func appendChannelLogEntry(log kvdb.RwBucket,
-	commit *ChannelCommitment) error {
-
-	var b bytes.Buffer
-	if err := serializeChanCommit(&b, commit); err != nil {
-		return err
-	}
-
-	logEntrykey := makeLogKey(commit.CommitHeight)
-	return log.Put(logEntrykey[:], b.Bytes())
-}
-
 func fetchThawHeight(chanBucket kvdb.RBucket) (uint32, error) {
 	var height uint32
 

channeldb/channel_test.go

@@ -52,8 +52,17 @@ var (
 		Port: 18555,
 	}
 
-	// keyLocIndex is the KeyLocator Index we use for TestKeyLocatorEncoding.
+	// keyLocIndex is the KeyLocator Index we use for
+	// TestKeyLocatorEncoding.
 	keyLocIndex = uint32(2049)
+
+	// dummyLocalOutputIndex specifics a default value for our output index
+	// in this test.
+	dummyLocalOutputIndex = uint32(0)
+
+	// dummyRemoteOutIndex specifics a default value for their output index
+	// in this test.
+	dummyRemoteOutIndex = uint32(1)
 )
 
 // testChannelParams is a struct which details the specifics of how a channel
@@ -548,6 +557,32 @@ func assertCommitmentEqual(t *testing.T, a, b *ChannelCommitment) {
 	}
 }
 
+// assertRevocationLogEntryEqual asserts that, for all the fields of a given
+// revocation log entry, their values match those on a given ChannelCommitment.
+func assertRevocationLogEntryEqual(t *testing.T, c *ChannelCommitment,
+	r *RevocationLog) {
+
+	// Check the common fields.
+	require.EqualValues(
+		t, r.CommitTxHash, c.CommitTx.TxHash(), "CommitTx mismatch",
+	)
+
+	// Now check the common fields from the HTLCs.
+	require.Equal(t, len(r.HTLCEntries), len(c.Htlcs), "HTLCs len mismatch")
+	for i, rHtlc := range r.HTLCEntries {
+		cHtlc := c.Htlcs[i]
+		require.Equal(t, rHtlc.RHash, cHtlc.RHash, "RHash mismatch")
+		require.Equal(t, rHtlc.Amt, cHtlc.Amt.ToSatoshis(),
+			"Amt mismatch")
+		require.Equal(t, rHtlc.RefundTimeout, cHtlc.RefundTimeout,
+			"RefundTimeout mismatch")
+		require.EqualValues(t, rHtlc.OutputIndex, cHtlc.OutputIndex,
+			"OutputIndex mismatch")
+		require.Equal(t, rHtlc.Incoming, cHtlc.Incoming,
+			"Incoming mismatch")
+	}
+}
+
 func TestChannelStateTransition(t *testing.T) {
 	t.Parallel()
 
@@ -748,7 +783,9 @@ func TestChannelStateTransition(t *testing.T) {
 	fwdPkg := NewFwdPkg(channel.ShortChanID(), oldRemoteCommit.CommitHeight,
 		diskCommitDiff.LogUpdates, nil)
 
-	err = channel.AdvanceCommitChainTail(fwdPkg, nil)
+	err = channel.AdvanceCommitChainTail(
+		fwdPkg, nil, dummyLocalOutputIndex, dummyRemoteOutIndex,
+	)
 	if err != nil {
 		t.Fatalf("unable to append to revocation log: %v", err)
 	}
@@ -761,16 +798,24 @@ func TestChannelStateTransition(t *testing.T) {
 
 	// We should be able to fetch the channel delta created above by its
 	// update number with all the state properly reconstructed.
-	diskPrevCommit, err := channel.FindPreviousState(
+	diskPrevCommit, _, err := channel.FindPreviousState(
 		oldRemoteCommit.CommitHeight,
 	)
 	if err != nil {
 		t.Fatalf("unable to fetch past delta: %v", err)
 	}
 
+	// Check the output indexes are saved as expected.
+	require.EqualValues(
+		t, dummyLocalOutputIndex, diskPrevCommit.OurOutputIndex,
+	)
+	require.EqualValues(
+		t, dummyRemoteOutIndex, diskPrevCommit.TheirOutputIndex,
+	)
+
 	// The two deltas (the original vs the on-disk version) should
 	// identical, and all HTLC data should properly be retained.
-	assertCommitmentEqual(t, &oldRemoteCommit, diskPrevCommit)
+	assertRevocationLogEntryEqual(t, &oldRemoteCommit, diskPrevCommit)
 
 	// The state number recovered from the tail of the revocation log
 	// should be identical to this current state.
@@ -796,17 +841,30 @@ func TestChannelStateTransition(t *testing.T) {
 
 	fwdPkg = NewFwdPkg(channel.ShortChanID(), oldRemoteCommit.CommitHeight, nil, nil)
 
-	err = channel.AdvanceCommitChainTail(fwdPkg, nil)
+	err = channel.AdvanceCommitChainTail(
+		fwdPkg, nil, dummyLocalOutputIndex, dummyRemoteOutIndex,
+	)
 	if err != nil {
 		t.Fatalf("unable to append to revocation log: %v", err)
 	}
 
 	// Once again, fetch the state and ensure it has been properly updated.
-	prevCommit, err := channel.FindPreviousState(oldRemoteCommit.CommitHeight)
+	prevCommit, _, err := channel.FindPreviousState(
+		oldRemoteCommit.CommitHeight,
+	)
 	if err != nil {
 		t.Fatalf("unable to fetch past delta: %v", err)
 	}
-	assertCommitmentEqual(t, &oldRemoteCommit, prevCommit)
+
+	// Check the output indexes are saved as expected.
+	require.EqualValues(
+		t, dummyLocalOutputIndex, diskPrevCommit.OurOutputIndex,
+	)
+	require.EqualValues(
+		t, dummyRemoteOutIndex, diskPrevCommit.TheirOutputIndex,
+	)
+
+	assertRevocationLogEntryEqual(t, &oldRemoteCommit, prevCommit)
 
 	// Once again, state number recovered from the tail of the revocation
 	// log should be identical to this current state.
@@ -860,7 +918,9 @@ func TestChannelStateTransition(t *testing.T) {
 
 	// Attempting to find previous states on the channel should fail as the
 	// revocation log has been deleted.
-	_, err = updatedChannel[0].FindPreviousState(oldRemoteCommit.CommitHeight)
+	_, _, err = updatedChannel[0].FindPreviousState(
+		oldRemoteCommit.CommitHeight,
+	)
 	if err == nil {
 		t.Fatal("revocation log search should have failed")
 	}

channeldb/db_test.go

@@ -409,7 +409,9 @@ func TestRestoreChannelShells(t *testing.T) {
 	if err != ErrNoRestoredChannelMutation {
 		t.Fatalf("able to mutate restored channel")
 	}
-	err = channel.AdvanceCommitChainTail(nil, nil)
+	err = channel.AdvanceCommitChainTail(
+		nil, nil, dummyLocalOutputIndex, dummyRemoteOutIndex,
+	)
 	if err != ErrNoRestoredChannelMutation {
 		t.Fatalf("able to mutate restored channel")
 	}

lnwallet/channel.go

@@ -2282,7 +2282,7 @@ func NewBreachRetribution(chanState *channeldb.OpenChannel, stateNum uint64,
 
 	// Query the on-disk revocation log for the snapshot which was recorded
 	// at this particular state num.
-	revokedSnapshot, err := chanState.FindPreviousState(stateNum)
+	_, revokedSnapshot, err := chanState.FindPreviousState(stateNum)
 	if err != nil {
 		return nil, err
 	}
@@ -4872,12 +4872,28 @@ func (lc *LightningChannel) ReceiveRevocation(revMsg *lnwire.RevokeAndAck) (
 		source, remoteChainTail, addUpdates, settleFailUpdates,
 	)
 
+	// We will soon be saving the current remote commitment to revocation
+	// log bucket, which is `lc.channelState.RemoteCommitment`. After that,
+	// the `RemoteCommitment` will be replaced with a newer version found
+	// in `CommitDiff`. Thus we need to compute the output indexes here
+	// before the change since the indexes are meant for the current,
+	// revoked remote commitment.
+	ourOutputIndex, theirOutputIndex, err := findOutputIndexesFromRemote(
+		revocation, lc.channelState,
+	)
+	if err != nil {
+		return nil, nil, nil, nil, err
+	}
+
 	// At this point, the revocation has been accepted, and we've rotated
 	// the current revocation key+hash for the remote party. Therefore we
 	// sync now to ensure the revocation producer state is consistent with
 	// the current commitment height and also to advance the on-disk
 	// commitment chain.
-	err = lc.channelState.AdvanceCommitChainTail(fwdPkg, localPeerUpdates)
+	err = lc.channelState.AdvanceCommitChainTail(
+		fwdPkg, localPeerUpdates,
+		ourOutputIndex, theirOutputIndex,
+	)
 	if err != nil {
 		return nil, nil, nil, nil, err
 	}