statedb revert to snapshot for ignored batches

[tudor-malene]

Why this change is needed

to avoid unexpected statedb mutations, revert to snapshot for ignored batches

[coderabbitai]

Walkthrough

The update in the code concerns the introduction of a mechanism to take a snapshot of the stateDB within the ComputeBatch function of a batchExecutor component. This snapshot, referred to as snap, is used to revert any unintended changes to the stateDB under certain conditions, enhancing the robustness of the function against state corruption during batch execution.

Changes

File Path	Change Summary
go/enclave/components/batch_executor.go	Introduced a snapshot variable snap to capture and revert the stateDB state within ComputeBatch.

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[coderabbitai]

Review Status

Actionable comments generated: 0

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Commits

Files that changed from the base of the PR and between 63ba499 and ac597c1.

Files selected for processing (1)

• go/enclave/components/batch_executor.go (2 hunks)

Additional comments: 5

go/enclave/components/batch_executor.go (5)

• 171-171: Creation of a snapshot of stateDB is a good practice to ensure that the state can be reverted if necessary. This aligns with the PR objective to maintain the integrity of stateDB.

• 221-222: The use of stateDB.RevertToSnapshot(snap) is correctly placed within the conditional block that checks for the absence of transactions to process. This ensures that the stateDB is only reverted when necessary, which is a critical part of the PR objective.

• 218-225: > Note: This review was outside the patches, so it was mapped to the patch with the greatest overlap. Original lines [168-225]

The snapshot and revert logic within the ComputeBatch function appears to be well-contained and should not interfere with other parts of the function. However, it is important to ensure that the snapshot is taken at the correct point in the function's execution and that no other state changes are missed when reverting.

Verification successful

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The snapshot creation in the ComputeBatch function is correctly placed immediately after the stateDB initialization and before any balance mutations. This ensures that the revert logic can correctly undo any changes if the conditions for reverting are met. The verification process has not revealed any issues with the snapshot and revert logic within the ComputeBatch function.

Scripts Executed

The following scripts were executed for the analysis:

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Script:

#!/bin/bash
# Verify that the snapshot is taken before any state mutations that could be affected by the revert logic.
rg --type go "stateDB\.(Set|Sub|Add)Balance" go/enclave/components/batch_executor.go

Length of output: 246

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Script:

#!/bin/bash
# Check the order of balance mutations in relation to the snapshot creation within the `ComputeBatch` function.
rg --type go -C 10 "snap := stateDB.Snapshot()" go/enclave/components/batch_executor.go

Length of output: 984

* 168-170: The error handling for the creation of the `stateDB` is present and correctly returns an error if the `stateDB` cannot be created. This is important for the robustness of the `ComputeBatch` function.

• 218-225: > Note: This review was outside the patches, so it was mapped to the patch with the greatest overlap. Original lines [1-414]

No other changes related to the PR objective are present in the rest of the file. The rest of the code remains unchanged and should function as before, assuming the snapshot functionality does not introduce side effects.