add ability to decode ecotone scalar values into components

[roberto-bayardo]

Description

ecotone-scalar is a script that is used to compute the post-Ecotone "scalar" value from its components. This PR extends this script with the ability to do the opposite: take a post-Ecotone scalar and output its components.

Tests

Verified decoding of a previously encoded value produces the expected matching output:

> ./main --scalar 1101 --blob-scalar 659851
# base fee scalar     : 1101
# blob base fee scalar: 659851
# v1 hex encoding  : 0x010000000000000000000000000000000000000000000000000a118b0000044d
# uint value for the 'scalar' parameter in SystemConfigProxy.setGasConfig():
452312848583266388373324160190187140051835877600158453279134021569375896653

> ./main --decode 452312848583266388373324160190187140051835877600158453279134021569375896653
# base fee scalar     : 1101
# blob base fee scalar: 659851
# v1 hex encoding  : 0x010000000000000000000000000000000000000000000000000a118b0000044d
# uint value for the 'scalar' parameter in SystemConfigProxy.setGasConfig():
452312848583266388373324160190187140051835877600158453279134021569375896653

[coderabbitai]

Walkthrough

Walkthrough

The recent updates introduce a new decode variable in the main function of main.go to handle decoding of uint256 post-ecotone scalar values. This allows the program to either decode the scalar value or encode it into a byte array based on the presence of the decode variable. Additionally, the error message in the DecodeScalar function within types.go has been refined to display the scalar value in hexadecimal format for better clarity.

Changes

File Path	Change Summary
op-chain-ops/cmd/ecotone-scalar/main.go	Added a decode variable to handle decoding of uint256 post-ecotone scalar values.
op-service/eth/types.go	Modified the DecodeScalar function to print scalar values in hexadecimal format in errors.

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Recent Review Details

Configuration used: .coderabbit.yml
Review profile: CHILL

Commits

Files that changed from the base of the PR and between b123e13 and 3accc8f.

Files selected for processing (2)

• op-chain-ops/cmd/ecotone-scalar/main.go (2 hunks)
• op-service/eth/types.go (1 hunks)

Additional comments not posted (4)

op-chain-ops/cmd/ecotone-scalar/main.go (3)

16-16: The description for the decode flag is clear and concise. Ensure that the usage message is updated to reflect the new flag.

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33-61: The decoding logic is well-implemented with appropriate error handling. Ensure that the eth.DecodeScalar function is thoroughly tested.

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62-65: The encoding logic is consistent with the decoding logic. Ensure that both encoding and decoding functions are covered by unit tests.

op-service/eth/types.go (1)

428-428: Updating the error message to display the hexadecimal representation of the scalar value improves clarity. Ensure that this change is reflected in any related documentation or logs.

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[coderabbitai]

Actionable comments posted: 1

[tynes]

Generally looks good to me, haven't tested it