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[Flow EVM] Run tracing hooks OnTxStart, OnTxEnd for DryRunTransaction #6491

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merged 2 commits into from
Sep 25, 2024
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[Flow EVM] Run tracing hooks OnTxStart, OnTxEnd for DryRunTransaction #6491

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295caaf
Run tracing hooks OnTxStart, OnTxEnd for DryRunTransaction
m-Peter Sep 23, 2024
ee3c489
Merge branch 'master' into dry-run-transaction-with-tracing
j1010001 Sep 24, 2024
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12 changes: 12 additions & 0 deletions fvm/evm/emulator/emulator.go
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Original file line number Diff line number Diff line change
Expand Up @@ -283,6 +283,11 @@ func (bl *BlockView) DryRunTransaction(
// we need to skip nonce check for dry run
msg.SkipAccountChecks = true

// call tracer
if proc.evm.Config.Tracer != nil && proc.evm.Config.Tracer.OnTxStart != nil {
proc.evm.Config.Tracer.OnTxStart(proc.evm.GetVMContext(), tx, msg.From)
}

// return without committing the state
txResult, err = proc.run(msg, tx.Hash(), tx.Type())
if txResult.Successful() {
Expand All @@ -306,6 +311,13 @@ func (bl *BlockView) DryRunTransaction(
txResult.GasConsumed += txResult.GasRefund
}

// call tracer on tx end
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I am not sure if this should be before or after adjusting the txResult.GasConsumed with the various buffers.

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I think it's correct the way it is now

if proc.evm.Config.Tracer != nil &&
proc.evm.Config.Tracer.OnTxEnd != nil &&
txResult != nil {
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txResult != nil this should always be true

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I saw that proc.run can return nil for txResult in some cases:

if err != nil {
	return nil, err
}

Besides, this is the exact same condition for both RunTransaction & BatchRunTransaction, so I wanted to be on the safe side.

proc.evm.Config.Tracer.OnTxEnd(txResult.Receipt(), txResult.ValidationError)
}

return txResult, err
}

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