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go-sql-driver / mysql

Go MySQL Driver is a MySQL driver for Go's (golang) database/sql package
https://pkg.go.dev/github.com/go-sql-driver/mysql
Mozilla Public License 2.0
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fix race condition when context is canceled #1562

Closed methane closed 7 months ago

methane commented 7 months ago

Description

Fix #1559.

This PR should be backported to 1.8.

Checklist

Summary by CodeRabbit

coderabbitai[bot] commented 7 months ago

Walkthrough

The modification in connection.go introduces a safeguard to prevent potential nil pointer dereferences by checking netConn before attempting to set a deadline. This change aims to enhance error handling during the cancellation process, specifically addressing scenarios where pending read/write operations could be interrupted without proper checks, potentially leading to data races or unexpected behavior in database transactions.

Changes

Files Change Summary
connection.go Added check for netConn before setting deadline to wake up pending reads/writes; improved error handling comments.

Assessment against linked issues

Objective Addressed Explanation
Data race resolution in mysqlConn during context cancellation (#1559) ✅
Synchronization of database transactions with context cancellation to prevent data races (#1559) ✅
Addressing read/write operation conflicts on mysqlConn during context cancellation (#1559) ✅
Compatibility and stability across configurations (driver, Go versions, server versions, OS) (#1559) ❓ The change addresses potential data races but does not explicitly validate across all configurations.

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coveralls commented 7 months ago

Coverage Status

coverage: 82.003%. remained the same when pulling b5687573e0932a794163bf41a6be148199b9344a on methane:fix-race-on-cancel into 1a6477358cbbc917d5370c53d3e35a13b45aed19 on go-sql-driver:master.