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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 some write error handling #1595

Closed methane closed 3 months ago

methane commented 3 months ago

Description

interpolateParams() returned ErrInvalidConn without closing the connection. Since database/sql doesn't understand ErrInvalidConn, there is a risk that database/sql reuse this connection and ErrInvalidConn is returned repeatedly.

This PR should be backported to 1.8.

Checklist

Summary by CodeRabbit

coderabbitai[bot] commented 3 months ago

Walkthrough

The recent updates enhance error handling in the mysqlConn struct by incorporating cleanup and logging mechanisms. Specifically, the interpolateParams and writePacket methods now invoke mc.cleanup() and, in the case of writePacket, also mc.log(err) upon encountering errors. This ensures better resource management and error reporting.

Changes

File Change Summary
connection.go Updated interpolateParams to call mc.cleanup() and return driver.ErrBadConn on buffer error.
packets.go Modified writePacket to call mc.cleanup() and mc.log(err) on write deadline error.

Poem

In code where packets flow and errors might, A rabbit hops to set things right. With cleanup swift and logs so clear, Stability and grace appear. 🐇💻✨

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coveralls commented 3 months ago

Coverage Status

coverage: 82.407% (-0.09%) from 82.494% when pulling 7b8f3763b24b1f448c2ab47507f82d8c301b1e49 on methane:fix-badconn into 2f7015e5c48d361a7dd188c01ae95379c7b9f6f9 on go-sql-driver:master.