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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
11 stars 9 forks source link

Add lock during transaction build #421

Closed sideninja closed 1 month ago

sideninja commented 1 month ago

In an edge case during multiple transactions submitted there could be a conflict between calling PublicKey and Sign which would produce invalid signature. This was observed couple of times on previewnet and this lock should address the issue.

For contributor use:

Summary by CodeRabbit

coderabbitai[bot] commented 1 month ago

Walkthrough

This change introduces concurrency control to the EVM struct in the services/requester/requester.go file. By adding a mutex, the code ensures that methods manipulating shared resources, particularly during transaction building and signing, are thread-safe. This enhancement minimizes the risk of race conditions by locking critical sections, allowing multiple goroutines to operate without conflict, thus improving the robustness of the EVM functionality.

Changes

File Path Change Summary
services/requester/requester.go Added a mutex to the EVM struct for concurrency control; modified buildTransaction to ensure thread-safe operations by locking and unlocking the mutex.

Poem

🐇 In the meadow where bunnies play,
A mutex now keeps race conditions at bay.
With locks in place, we dance and cheer,
Safe transactions bring us near!
So hop along, with code so bright,
The EVM shines, a joyful sight! ✨

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