onflow / flow-evm-gateway

FlowEVM Gateway implements an Ethereum-equivalent JSON-RPC API for EVM clients to use
https://developers.flow.com/evm/about
Apache License 2.0
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Patch block RLP decoding to handle addition of `PrevRandao` field #472

Closed m-Peter closed 2 months ago

m-Peter commented 2 months ago

Description

The block structure has changed, and now includes a new field: PrevRandao. Hence, we need to patch the RLP decoding for the blocks with the previous format, which lack the PrevRandao field. We also need to properly handle the block hash calculation, to not take into account this field, for past blocks.


For contributor use:

Summary by CodeRabbit

coderabbitai[bot] commented 2 months ago

Walkthrough

The changes encompass modifications to the NewBlockFromBytes function and the Block structure in models/block.go, enhancing error handling and introducing backward compatibility. A new method, ToBytes, is added to the Block structure, while the blockV0 type is introduced for earlier block versions. Corresponding tests are also added in models/block_test.go to ensure proper functionality and decoding of historical block formats.

Changes

Files Change Summary
models/block.go Modified NewBlockFromBytes and decodeBlockBreakingChanges to return errors; added ToBytes method; introduced blockV0 type with a Hash method.
models/block_test.go Added Test_DecodePastBlockFormat to validate decoding of specific block formats and properties.

Sequence Diagram(s)

sequenceDiagram
    participant Client
    participant BlockManager
    participant BlockDecoder

    Client->>BlockManager: Request NewBlockFromBytes
    BlockManager->>BlockDecoder: Decode block data
    BlockDecoder-->>BlockManager: Return Block, error
    BlockManager-->>Client: Return Block, error

🐰 "In bytes and blocks, we hop and play,
New methods added, hip-hip-hooray!
With backward paths and errors caught,
Our blocks are better, just as we thought!
A test to check, we're all aglow,
Hopping forward, watch us grow!" πŸ‡βœ¨


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