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rename sync variables.

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This commit is contained in:
Łukasz Magiera 2020-07-08 22:02:28 +02:00
parent 24d8a84ad7
commit 8fbeebb86d
1 changed files with 28 additions and 31 deletions
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59
chain/sync.go
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@ -1069,17 +1069,14 @@ func extractSyncState(ctx context.Context) *SyncerState {
// collectHeaders collects the headers from the blocks between any two tipsets.
//
// `from` is the heaviest/projected/target tipset we have learned about, and
// `to` is usually an anchor tipset we already have in our view of the chain
// `incoming` is the heaviest/projected/target tipset we have learned about, and
// `known` is usually an anchor tipset we already have in our view of the chain
// (which could be the genesis).
//
// collectHeaders checks if portions of the chain are in our ChainStore; falling
// down to the network to retrieve the missing parts. If during the process, any
// portion we receive is in our denylist (bad list), we short-circuit.
//
// {hint/naming}: `from` and `to` is in inverse order. `from` is the highest,
// and `to` is the lowest. This method traverses the chain backwards.
//
// {hint/usage}: This is used by collectChain, which is in turn called from the
// main Sync method (Syncer#Sync), so it's a pretty central method.
//
@ -1089,7 +1086,7 @@ func extractSyncState(ctx context.Context) *SyncerState {
// bad.
// 2. Check the consistency of beacon entries in the from tipset. We check
// total equality of the BeaconEntries in each block.
// 3. Travers the chain backwards, for each tipset:
// 3. Traverse the chain backwards, for each tipset:
// 3a. Load it from the chainstore; if found, it move on to its parent.
// 3b. Query our peers via BlockSync in batches, requesting up to a
// maximum of 500 tipsets every time.
@ -1100,40 +1097,40 @@ func extractSyncState(ctx context.Context) *SyncerState {
//
// All throughout the process, we keep checking if the received blocks are in
// the deny list, and short-circuit the process if so.
func (syncer *Syncer) collectHeaders(ctx context.Context, from *types.TipSet, to *types.TipSet) ([]*types.TipSet, error) {
func (syncer *Syncer) collectHeaders(ctx context.Context, incoming *types.TipSet, known *types.TipSet) ([]*types.TipSet, error) {
ctx, span := trace.StartSpan(ctx, "collectHeaders")
defer span.End()
ss := extractSyncState(ctx)
span.AddAttributes(
trace.Int64Attribute("fromHeight", int64(from.Height())),
trace.Int64Attribute("toHeight", int64(to.Height())),
trace.Int64Attribute("fromHeight", int64(incoming.Height())),
trace.Int64Attribute("toHeight", int64(known.Height())),
)
// Check if the parents of the from block are in the denylist.
// i.e. if a fork of the chain has been requested that we know to be bad.
for _, pcid := range from.Parents().Cids() {
for _, pcid := range incoming.Parents().Cids() {
if reason, ok := syncer.bad.Has(pcid); ok {
newReason := reason.Linked("linked to %s", pcid)
for _, b := range from.Cids() {
for _, b := range incoming.Cids() {
syncer.bad.Add(b, newReason)
}
return nil, xerrors.Errorf("chain linked to block marked previously as bad (%s, %s) (reason: %s)", from.Cids(), pcid, reason)
return nil, xerrors.Errorf("chain linked to block marked previously as bad (%s, %s) (reason: %s)", incoming.Cids(), pcid, reason)
}
}
{
// ensure consistency of beacon entires
targetBE := from.Blocks()[0].BeaconEntries
targetBE := incoming.Blocks()[0].BeaconEntries
sorted := sort.SliceIsSorted(targetBE, func(i, j int) bool {
return targetBE[i].Round < targetBE[j].Round
})
if !sorted {
syncer.bad.Add(from.Cids()[0], NewBadBlockReason(from.Cids(), "wrong order of beacon entires"))
syncer.bad.Add(incoming.Cids()[0], NewBadBlockReason(incoming.Cids(), "wrong order of beacon entires"))
return nil, xerrors.Errorf("wrong order of beacon entires")
}
for _, bh := range from.Blocks()[1:] {
for _, bh := range incoming.Blocks()[1:] {
if len(targetBE) != len(bh.BeaconEntries) {
// cannot mark bad, I think @Kubuxu
return nil, xerrors.Errorf("tipset contained different number for beacon entires")
@ -1148,12 +1145,12 @@ func (syncer *Syncer) collectHeaders(ctx context.Context, from *types.TipSet, to
}
}
blockSet := []*types.TipSet{from}
blockSet := []*types.TipSet{incoming}
at := from.Parents()
at := incoming.Parents()
// we want to sync all the blocks until the height above the block we have
untilHeight := to.Height() + 1
untilHeight := known.Height() + 1
ss.SetHeight(blockSet[len(blockSet)-1].Height())
@ -1168,7 +1165,7 @@ loop:
syncer.bad.Add(b, newReason)
}
return nil, xerrors.Errorf("chain contained block marked previously as bad (%s, %s) (reason: %s)", from.Cids(), bc, reason)
return nil, xerrors.Errorf("chain contained block marked previously as bad (%s, %s) (reason: %s)", incoming.Cids(), bc, reason)
}
}
@ -1217,7 +1214,7 @@ loop:
syncer.bad.Add(b, newReason)
}
return nil, xerrors.Errorf("chain contained block marked previously as bad (%s, %s) (reason: %s)", from.Cids(), bc, reason)
return nil, xerrors.Errorf("chain contained block marked previously as bad (%s, %s) (reason: %s)", incoming.Cids(), bc, reason)
}
}
blockSet = append(blockSet, b)
@ -1229,23 +1226,23 @@ loop:
at = blks[len(blks)-1].Parents()
}
if !types.CidArrsEqual(blockSet[len(blockSet)-1].Parents().Cids(), to.Cids()) {
last := blockSet[len(blockSet)-1]
if last.Parents() == to.Parents() {
// base is the tipset in the candidate chain at the height equal to our known tipset height.
if base := blockSet[len(blockSet)-1]; !types.CidArrsEqual(base.Parents().Cids(), known.Cids()) {
if base.Parents() == known.Parents() {
// common case: receiving a block thats potentially part of the same tipset as our best block
return blockSet, nil
}
// We have now ascertained that this is *not* a 'fast forward'
log.Warnf("(fork detected) synced header chain (%s - %d) does not link to our best block (%s - %d)", from.Cids(), from.Height(), to.Cids(), to.Height())
fork, err := syncer.syncFork(ctx, last, to)
log.Warnf("(fork detected) synced header chain (%s - %d) does not link to our best block (%s - %d)", incoming.Cids(), incoming.Height(), known.Cids(), known.Height())
fork, err := syncer.syncFork(ctx, base, known)
if err != nil {
if xerrors.Is(err, ErrForkTooLong) {
// TODO: we're marking this block bad in the same way that we mark invalid blocks bad. Maybe distinguish?
log.Warn("adding forked chain to our bad tipset cache")
for _, b := range from.Blocks() {
syncer.bad.Add(b.Cid(), NewBadBlockReason(from.Cids(), "fork past finality"))
for _, b := range incoming.Blocks() {
syncer.bad.Add(b.Cid(), NewBadBlockReason(incoming.Cids(), "fork past finality"))
}
}
return nil, xerrors.Errorf("failed to sync fork: %w", err)
@ -1265,13 +1262,13 @@ var ErrForkTooLong = fmt.Errorf("fork longer than threshold")
// If the fork is too long (build.ForkLengthThreshold), we add the entire subchain to the
// denylist. Else, we find the common ancestor, and add the missing chain
// fragment until the fork point to the returned []TipSet.
func (syncer *Syncer) syncFork(ctx context.Context, from *types.TipSet, to *types.TipSet) ([]*types.TipSet, error) {
tips, err := syncer.Bsync.GetBlocks(ctx, from.Parents(), int(build.ForkLengthThreshold))
func (syncer *Syncer) syncFork(ctx context.Context, incoming *types.TipSet, known *types.TipSet) ([]*types.TipSet, error) {
tips, err := syncer.Bsync.GetBlocks(ctx, incoming.Parents(), int(build.ForkLengthThreshold))
if err != nil {
return nil, err
}
nts, err := syncer.store.LoadTipSet(to.Parents())
nts, err := syncer.store.LoadTipSet(known.Parents())
if err != nil {
return nil, xerrors.Errorf("failed to load next local tipset: %w", err)
}
@ -1281,7 +1278,7 @@ func (syncer *Syncer) syncFork(ctx context.Context, from *types.TipSet, to *type
if !syncer.Genesis.Equals(nts) {
return nil, xerrors.Errorf("somehow synced chain that linked back to a different genesis (bad genesis: %s)", nts.Key())
}
return nil, xerrors.Errorf("synced chain forked at genesis, refusing to sync")
return nil, xerrors.Errorf("synced chain forked at genesis, refusing to sync; incoming: %s")
}
if nts.Equals(tips[cur]) {