Fix issue 1567 #1570
Fix issue 1567 #1570
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WalkthroughThe changes involve improvements to the MySQL driver's connection handling, particularly in network connection logic, TCP connection keepalives, and the addition of a new test function for a specific issue. These modifications aim to enhance stability, address data race conditions, and improve error handling within the driver. Changes
Assessment against linked issues
Related issues
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Review Status
Actionable comments generated: 0
Configuration used: CodeRabbit UI
Files selected for processing (4)
- connection.go (1 hunks)
- connector.go (1 hunks)
- driver_test.go (2 hunks)
- packets.go (1 hunks)
Additional comments: 4
connector.go (1)
- 108-108: The change correctly assigns
mc.netConntomc.rawConnto address the data race issue by ensuring consistent connection handling post-TLS handshake. Please ensure thatmc.rawConnis used consistently in all relevant parts of the codebase to prevent data races. Additionally, assess any potential side effects of this change, especially in error handling and connection cleanup.Verification successful
The verification process did not find any issues with the use of
mc.rawConnor potential side effects in error handling and connection cleanup based on the provided search criteria. It's important to ensure thatmc.rawConnis used consistently in all relevant parts of the codebase to prevent data races, and any potential side effects, especially in error handling and connection cleanup, are carefully assessed. Given the information available, no issues were detected.Scripts Executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash # Verify consistent use of mc.rawConn in relevant parts of the codebase. rg --type go 'mc\.rawConn' | grep -v 'mc.rawConn = mc.netConn' # Assess potential side effects in error handling and connection cleanup. rg --type go 'cleanup\(\)' | grep -B 3 -A 3 'mc\.rawConn'Length of output: 232
connection.go (1)
- 156-160: The renaming of the variable from
nctoconnwithin thecleanupmethod improves code readability and clarity. Please ensure that the renamed variable is used consistently within the method and verify that there are no leftover references to the old variable name that could lead to errors.Verification successful
The analysis of the provided context confirms that the renaming of the variable from
nctoconnwithin thecleanupmethod and throughoutconnection.gohas been applied consistently. There are no leftover references to the old variable name, indicating that the change has been implemented correctly and aligns with the goal of improving code readability and clarity.Scripts Executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash # Verify consistent use of the renamed variable within the method. rg --type go 'nc' 'connection.go' | grep -B 3 -A 3 'cleanup\(\)' # Ensure there are no leftover references to the old variable name. rg --type go 'nc' 'connection.go'Length of output: 3417
packets.go (1)
- 351-356: > 📝 NOTE
This review was outside the diff hunks, and no overlapping diff hunk was found. Original lines [1-1]
While the PR summary mentions changes related to the handling of
mc.rawConnandmc.netConn, the provided code does not explicitly show these changes. It's important to ensure that the removal of the assignment betweenmc.rawConnandmc.netConndoes not introduce any unintended side effects, especially in the context of TLS connections. Please verify that the network connection handling logic, particularly after the TLS handshake, remains correct and secure.driver_test.go (1)
- 3583-3612: The test function
TestIssue1567is designed to address a critical data race issue when TLS is enabled, specifically betweenmysqlConn.cleanup()andwriteHandshakeResponsePacket. The test simulates network latency and connection timeouts to trigger the race condition. However, there are a few improvements and considerations to be made:
- The test disables connection pooling by setting
MaxIdleConnsto 0. This is a good practice for this test scenario as it ensures that eachPingContextcall creates a new connection, which is necessary to reproduce the race condition.- The test uses a random timeout for the context passed to
PingContext, based on the estimated round-trip time (RTT) to the server. This approach effectively simulates various network conditions. However, it's important to ensure that the RTT estimation is accurate and that the range of timeouts is appropriate for triggering the race condition.- The loop count is reduced to 10 when running in short mode. This is reasonable for quick checks, but it's important to run the full test suite with a higher count (1000) to thoroughly test the fix.
- The test does not check the error returned by
PingContext. While the primary goal is to trigger the race condition rather than check for successful pings, it might be useful to log or handle errors to ensure that the test setup is correct and that the database is reachable.Overall, the test function seems well-designed to reproduce and verify the fix for the reported data race issue. It would be beneficial to add error handling for the
PingContextcall to ensure the test's reliability.Consider adding error handling for the
PingContextcall to ensure that any unexpected issues during the test execution are caught and can be investigated.
(cherry picked from commit d7ddb8b)
Description
closes #1567
When TLS is enabled,
mc.netConnis rewritten after the TLS handshak as detailed here:mysql/packets.go
Line 355 in d86c452
Therefore,
mc.netConnshould not be accessed within the watcher goroutine.Instead,
mc.rawConnshould be initialized prior to invokingmc.startWatcher, andmc.rawConnshould be used in lieu ofmc.netConn.Checklist
Summary by CodeRabbit