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eth/fetcher: allow backward uncle imports too

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This commit is contained in:
Péter Szilágyi 2015-06-18 19:43:47 +03:00
parent 90d45f0397
commit ecd19919c5
1 changed files with 3 additions and 2 deletions
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5
eth/fetcher/fetcher.go
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@ -16,6 +16,7 @@ import (
const (
arriveTimeout = 500 * time.Millisecond // Time allowance before an announced block is explicitly requested
fetchTimeout = 5 * time.Second // Maximum alloted time to return an explicitly requested block
maxUncleDist = 7 // Maximum allowed backward distance from the chain head
maxQueueDist = 256 // Maximum allowed distance from the chain head to queue
)
@ -202,7 +203,7 @@ func (f *Fetcher) loop() {
break
}
// Otherwise if fresh and still unknown, try and import
if number <= height || f.getBlock(op.block.Hash()) != nil {
if number+maxUncleDist < height || f.getBlock(op.block.Hash()) != nil {
continue
}
f.insert(op.origin, op.block)
@ -317,7 +318,7 @@ func (f *Fetcher) enqueue(peer string, block *types.Block) {
hash := block.Hash()
// Discard any past or too distant blocks
if dist := int64(block.NumberU64()) - int64(f.chainHeight()); dist <= 0 || dist > maxQueueDist {
if dist := int64(block.NumberU64()) - int64(f.chainHeight()); dist < -maxUncleDist || dist > maxQueueDist {
glog.V(logger.Detail).Infof("Peer %s: discarded block #%d [%x], distance %d", peer, block.NumberU64(), hash.Bytes()[:4], dist)
return
}