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blockservice: optimize getBlocks filter by not rescanning the already valid leading elements #557

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blockservice: optimize getBlocks filter by not rescanning the already valid leading elements #557

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14 changes: 7 additions & 7 deletions blockservice/blockservice.go
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Original file line number Diff line number Diff line change
Expand Up @@ -367,25 +367,25 @@ func getBlocks(ctx context.Context, ks []cid.Cid, blockservice BlockService, fet
allowlist := grabAllowlistFromBlockservice(blockservice)
blocker := grabBlockerFromBlockservice(blockservice)

allValid := true
for _, c := range ks {
var lastAllValidIndex int
var c cid.Cid
for lastAllValidIndex, c = range ks {
if err := verifcid.ValidateCid(allowlist, c); err != nil {
allValid = false
break
}

if blocker != nil {
if err := blocker(c); err != nil {
allValid = false
break
}
}
}

if !allValid {
if lastAllValidIndex != len(ks) {
// can't shift in place because we don't want to clobber callers.
ks2 := make([]cid.Cid, 0, len(ks))
for _, c := range ks {
ks2 := make([]cid.Cid, lastAllValidIndex, len(ks))
copy(ks2, ks[:lastAllValidIndex]) // fast path for already filtered elements
for _, c := range ks[lastAllValidIndex:] { // don't rescan already scanned elements
// hash security
if err := verifcid.ValidateCid(allowlist, c); err != nil {
logger.Errorf("unsafe CID (%s) passed to blockService.GetBlocks: %s", c, err)
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