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core: fix chain indexer reorg bug

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This commit is contained in:
Zsolt Felfoldi 2019-06-20 23:33:42 +02:00
parent 25c3282cf1
commit 48c9d284c1
1 changed files with 17 additions and 2 deletions
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19
core/chain_indexer.go
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@ -323,6 +323,7 @@ func (c *ChainIndexer) updateLoop() {
updated = time.Now()
}
// Cache the current section count and head to allow unlocking the mutex
c.verifyLastHead()
section := c.storedSections
var oldHead common.Hash
if section > 0 {
@ -342,8 +343,8 @@ func (c *ChainIndexer) updateLoop() {
}
c.lock.Lock()
// If processing succeeded and no reorgs occcurred, mark the section completed
if err == nil && oldHead == c.SectionHead(section-1) {
// If processing succeeded and no reorgs occurred, mark the section completed
if err == nil && (section == 0 || oldHead == c.SectionHead(section-1)) {
c.setSectionHead(section, newHead)
c.setValidSections(section + 1)
if c.storedSections == c.knownSections && updating {
@ -358,6 +359,7 @@ func (c *ChainIndexer) updateLoop() {
} else {
// If processing failed, don't retry until further notification
c.log.Debug("Chain index processing failed", "section", section, "err", err)
c.verifyLastHead()
c.knownSections = c.storedSections
}
}
@ -411,6 +413,18 @@ func (c *ChainIndexer) processSection(section uint64, lastHead common.Hash) (com
return lastHead, nil
}
// verifyLastHead compares last stored section head with the corresponding block hash in the
// actual canonical chain and rolls back reorged sections if necessary to ensure that stored
// sections are all valid
func (c *ChainIndexer) verifyLastHead() {
for c.storedSections > 0 {
if c.SectionHead(c.storedSections-1) == rawdb.ReadCanonicalHash(c.chainDb, c.storedSections*c.sectionSize-1) {
return
}
c.setValidSections(c.storedSections - 1)
}
}
// Sections returns the number of processed sections maintained by the indexer
// and also the information about the last header indexed for potential canonical
// verifications.
@ -418,6 +432,7 @@ func (c *ChainIndexer) Sections() (uint64, uint64, common.Hash) {
c.lock.Lock()
defer c.lock.Unlock()
c.verifyLastHead()
return c.storedSections, c.storedSections*c.sectionSize - 1, c.SectionHead(c.storedSections - 1)
}