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eth/downloader: fix partial rollback and ancestor lookup

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This commit is contained in:
Péter Szilágyi 2016-02-16 10:36:26 +02:00
parent 4f28c5b69d
commit 216729009b
1 changed files with 28 additions and 2 deletions
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30
eth/downloader/downloader.go
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@ -571,8 +571,14 @@ func (d *Downloader) findAncestor61(p *peer) (uint64, error) {
// Check if a common ancestor was found
finished = true
for i := len(hashes) - 1; i >= 0; i-- {
// Skip any headers that underflow/overflow our requested set
header := d.getHeader(hashes[i])
if header == nil || header.Number.Int64() < from || header.Number.Uint64() > head {
continue
}
// Otherwise check if we already know the header or not
if d.hasBlockAndState(hashes[i]) {
number, hash = uint64(from)+uint64(i), hashes[i]
number, hash = header.Number.Uint64(), header.Hash()
break
}
}
@ -990,12 +996,28 @@ func (d *Downloader) findAncestor(p *peer) (uint64, error) {
// Make sure the peer actually gave something valid
headers := packet.(*headerPack).headers
if len(headers) == 0 {
glog.V(logger.Debug).Infof("%v: empty head header set", p)
glog.V(logger.Warn).Infof("%v: empty head header set", p)
return 0, errEmptyHeaderSet
}
// Make sure the peer's reply conforms to the request
for i := 0; i < len(headers); i++ {
if number := headers[i].Number.Int64(); number != from+int64(i) {
glog.V(logger.Warn).Infof("%v: head header set (item %d) broke chain ordering: requested %d, got %d", p, i, from+int64(i), number)
return 0, errInvalidChain
}
if i > 0 && headers[i-1].Hash() != headers[i].ParentHash {
glog.V(logger.Warn).Infof("%v: head header set (item %d) broke chain ancestry: expected [%x], got [%x]", p, i, headers[i-1].Hash().Bytes()[:4], headers[i].ParentHash[:4])
return 0, errInvalidChain
}
}
// Check if a common ancestor was found
finished = true
for i := len(headers) - 1; i >= 0; i-- {
// Skip any headers that underflow/overflow our requested set
if headers[i].Number.Int64() < from || headers[i].Number.Uint64() > head {
continue
}
// Otherwise check if we already know the header or not
if (d.mode != LightSync && d.hasBlockAndState(headers[i].Hash())) || (d.mode == LightSync && d.hasHeader(headers[i].Hash())) {
number, hash = headers[i].Number.Uint64(), headers[i].Hash()
break
@ -1206,6 +1228,10 @@ func (d *Downloader) fetchHeaders(p *peer, td *big.Int, from uint64) error {
frequency = 1
}
if n, err := d.insertHeaders(headers, frequency); err != nil {
// If some headers were inserted, add them too to the rollback list
if n > 0 {
rollback = append(rollback, headers[:n]...)
}
glog.V(logger.Debug).Infof("%v: invalid header #%d [%x…]: %v", p, headers[n].Number, headers[n].Hash().Bytes()[:4], err)
return errInvalidChain
}