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Fixed bug in OnCodeChange missing in some cases while it was before

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This commit is contained in:
Matthieu Vachon 2025-02-06 13:42:40 -05:00
parent 33e06f6765
commit 943de0bf94
1 changed files with 13 additions and 1 deletions
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14
eth/tracers/firehose.go
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@ -1310,7 +1310,19 @@ func (f *Firehose) OnCodeChange(a common.Address, prevCodeHash common.Hash, prev
// Geth 1.14.12 introduced a new behavior where a code change is emitted when a contract
// suicides. This was not the case before and we must ignore those changes to keep backward
// compatibility with the Firehose 2.3 and 3.0 model.
if activeCall.Suicide && len(code) == 0 {
//
// There is a gotcha to all that here is that a contract created that selfdestructs in the constructor
// directly does create a code change in Firehose 2.3 and 3.0. The weird thing is that the previous
// code received in the OnChangeCode in this case is empty.
//
// The new behavior introduced in Geth 1.14.12 around code change though has a check on
// `len(prevCode) > 0` which means those new added OnCodeChange calls are done only if a previous
// code existed.
//
// Since a selfdestruct in the constructor does not have a previous code, it will not enter this condition
// and will remain compatible with the Firehose 2.3 and 3.0 model in that particular corner case.
if activeCall.Suicide && len(prev) > 0 && len(code) == 0 {
firehoseDebug("ignoring code change due to suicide (prev: %s (%d), new: %s (%d)", prevCodeHash, len(prev), codeHash, len(code))
return
}