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eth/downloader/whitelist: skip future chain validation (#796)

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* eth/downloader/whitelist: skip future chain validation

* eth/downloader/whitelist: fix tests for future chain import
This commit is contained in:
Manav Darji 2023-03-31 12:03:19 +05:30 committed by GitHub
parent ef8f0abf78
commit b39e64c335
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GPG key ID: 4AEE18F83AFDEB23
2 changed files with 17 additions and 12 deletions
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18
eth/downloader/whitelist/service.go
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@ -100,18 +100,20 @@ func (w *Service) IsValidChain(currentHeader *types.Header, chain []*types.Heade
} }
// Split the chain into past and future chain // Split the chain into past and future chain
pastChain, futureChain := splitChain(current, chain) pastChain, _ := splitChain(current, chain)
// Note: Do not act on future chain and allow importing all kinds of future chains.
// Add an offset to future chain if it's not in continuity // Add an offset to future chain if it's not in continuity
offset := 0 // offset := 0
if len(futureChain) != 0 { // if len(futureChain) != 0 {
offset += int(futureChain[0].Number.Uint64()-currentHeader.Number.Uint64()) - 1 // offset += int(futureChain[0].Number.Uint64()-currentHeader.Number.Uint64()) - 1
} // }
// Don't accept future chain of unacceptable length (from current block) // Don't accept future chain of unacceptable length (from current block)
if len(futureChain)+offset > int(w.checkpointInterval) { // if len(futureChain)+offset > int(w.checkpointInterval) {
return false, ErrLongFutureChain // return false, ErrLongFutureChain
} // }
// Iterate over the chain and validate against the last checkpoint // Iterate over the chain and validate against the last checkpoint
// It will handle all cases where the incoming chain has atleast one checkpoint // It will handle all cases where the incoming chain has atleast one checkpoint

11
eth/downloader/whitelist/service_test.go
View file

@ -166,7 +166,7 @@ func TestIsValidChain(t *testing.T) {
// create a future chain to be imported of length <= `checkpointInterval` // create a future chain to be imported of length <= `checkpointInterval`
chainB := createMockChain(21, 30) // B21->B22...B29->B30 chainB := createMockChain(21, 30) // B21->B22...B29->B30
// case5: Try importing a future chain of acceptable length // case5: Try importing a future chain (1)
res, err = s.IsValidChain(chainA[len(chainA)-1], chainB) res, err = s.IsValidChain(chainA[len(chainA)-1], chainB)
require.Equal(t, res, true, "expected chain to be valid") require.Equal(t, res, true, "expected chain to be valid")
require.Equal(t, err, nil, "expected error to be nil") require.Equal(t, err, nil, "expected error to be nil")
@ -174,10 +174,13 @@ func TestIsValidChain(t *testing.T) {
// create a future chain to be imported of length > `checkpointInterval` // create a future chain to be imported of length > `checkpointInterval`
chainB = createMockChain(21, 40) // C21->C22...C39->C40 chainB = createMockChain(21, 40) // C21->C22...C39->C40
// case5: Try importing a future chain of unacceptable length // Note: Earlier, it used to reject future chains longer than some threshold.
// That check is removed for now.
// case6: Try importing a future chain (2)
res, err = s.IsValidChain(chainA[len(chainA)-1], chainB) res, err = s.IsValidChain(chainA[len(chainA)-1], chainB)
require.Equal(t, res, false, "expected chain to be invalid") require.Equal(t, res, true, "expected chain to be valid")
require.Equal(t, err, ErrLongFutureChain, "expected error") require.Equal(t, err, nil, "expected error to be nil")
} }
func TestSplitChain(t *testing.T) { func TestSplitChain(t *testing.T) {