remove errBadConnNoWrite and markBadConn #1583
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WalkthroughThe changes primarily involve refactoring error handling and logging within the Changes
Assessment against linked issues
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Review Details
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Review profile: CHILL
Files selected for processing (5)
- connection.go (11 hunks)
- connection_test.go (2 hunks)
- errors.go (1 hunks)
- packets.go (8 hunks)
- statement.go (2 hunks)
Files skipped from review due to trivial changes (1)
- errors.go
Additional comments not posted (20)
connection_test.go (2)
171-172: Good use oferrors.Isfor error comparison.
188-189: Good use oferrors.Isfor error comparison.statement.go (2)
60-60: Simplified error handling by directly returning the error.
103-103: Simplified error handling by directly returning the error.connection.go (6)
120-120: Simplified error handling by directly returning the error.
174-174: Simplified error handling by directly returning the error.
207-208: Simplified error handling by directly returning the error.
318-318: Simplified error handling by directly returning the error.
462-462: Simplified error handling by directly returning the error.
668-669: Good addition of theIsValidmethod to implement thedriver.Validatorinterface.packets.go (10)
125-125: Ensure proper cleanup on write error.The call to
mc.cleanup()on write error ensures that resources are properly released. This is a good practice to avoid resource leaks.
130-131: Return specific error on write failure.Returning the specific error
erron write failure helps in better error diagnosis and handling.
132-134: Handle short write scenario.Returning
io.ErrShortWritewhennis not equal tosize + 4ensures that partial writes are correctly identified and handled.
299-300: Ensure proper cleanup on buffer error.The call to
mc.cleanup()on buffer error ensures that resources are properly released. This is a good practice to avoid resource leaks.
388-389: Ensure proper cleanup on buffer error.The call to
mc.cleanup()on buffer error ensures that resources are properly released. This is a good practice to avoid resource leaks.
408-409: Ensure proper cleanup on buffer error.The call to
mc.cleanup()on buffer error ensures that resources are properly released. This is a good practice to avoid resource leaks.
427-428: Ensure proper cleanup on buffer error.The call to
mc.cleanup()on buffer error ensures that resources are properly released. This is a good practice to avoid resource leaks.
448-449: Ensure proper cleanup on buffer error.The call to
mc.cleanup()on buffer error ensures that resources are properly released. This is a good practice to avoid resource leaks.
990-991: Ensure proper cleanup on buffer error.The call to
mc.cleanup()on buffer error ensures that resources are properly released. This is a good practice to avoid resource leaks.
1189-1190: Ensure proper cleanup on buffer store error.The call to
mc.cleanup()on buffer store error ensures that resources are properly released. This is a good practice to avoid resource leaks.
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Files selected for processing (2)
- connection.go (11 hunks)
- packets.go (9 hunks)
Files skipped from review as they are similar to previous changes (2)
- connection.go
- packets.go
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Files selected for processing (5)
- connection.go (11 hunks)
- connection_test.go (2 hunks)
- errors.go (1 hunks)
- packets.go (9 hunks)
- statement.go (2 hunks)
Files skipped from review as they are similar to previous changes (5)
- connection.go
- connection_test.go
- errors.go
- packets.go
- statement.go
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Actionable comments posted: 1
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Files selected for processing (2)
- connection.go (11 hunks)
- packets.go (9 hunks)
Files skipped from review as they are similar to previous changes (1)
- packets.go
Additional comments not posted (5)
connection.go (5)
120-120: Ensure proper error handling in thebeginmethod.
323-323: Ensure that the error handling inExecis consistent with the new error handling strategy.
331-331: Review the error handling inexecto ensure it aligns with the new error handling strategy.
471-471: Confirm that the error handling inPingaligns with the new error handling strategy.
677-678: Confirm implementation of interfacesdriver.SessionResetteranddriver.Validator.The implementation of these interfaces is crucial for the new connection validation logic. Good to see this aligned with the PR objectives.
Also applies to: 685-685
connection.go
Outdated
| mc.cleanup() | ||
| // interpolateParams would be called before sending any query. | ||
| // So its safe to retry. | ||
| mc.log(err) | ||
| return "", ErrInvalidConn | ||
| return "", driver.ErrBadConn |
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Consider simplifying the error handling in interpolateParams.
- mc.cleanup()
- mc.log(err)
+ return "", errThis change would make the error handling more straightforward and consistent with other parts of the code.
Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation.
| mc.cleanup() | |
| // interpolateParams would be called before sending any query. | |
| // So its safe to retry. | |
| mc.log(err) | |
| return "", ErrInvalidConn | |
| return "", driver.ErrBadConn | |
| // interpolateParams would be called before sending any query. | |
| // So its safe to retry. | |
| return "", err |
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This is simply a bug fix. Since it did not close the connection and also did not return ErrBadConn, if the connection was in a state where takeCompleteBuffer() failed for any reason, ErrInvalidConn could be returned repeatedly, depending on how the application was used.
This fix may need to be backported. I will create a separate PR.
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@methane, thank you for your insights and for highlighting the importance of this bug fix. Ensuring that ErrBadConn is returned correctly is crucial for the robustness of error handling in connection management. If there's anything more you need regarding the backporting process or any other assistance, please feel free to let me know. Looking forward to seeing the improvements in the upcoming PR!
| return err | ||
| } | ||
| return driver.ErrBadConn | ||
| } |
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This function and errBadConnNoWrite were completely meaningless. There is no need to use errBadConnNoWrite once and convert it to ErrBadConn, as you can just use ErrBadConn directly if you are not sending anything yet.
| func (mc *mysqlConn) Begin() (driver.Tx, error) { | ||
| return mc.begin(false) | ||
| } | ||
|
|
||
| func (mc *mysqlConn) begin(readOnly bool) (driver.Tx, error) { | ||
| if mc.closed.Load() { | ||
| mc.log(ErrInvalidConn) |
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This log only confuses users and does not help. When a connection is closed, the reason should be logged if necessary.
connection.go
Outdated
| mc.cleanup() | ||
| // interpolateParams would be called before sending any query. | ||
| // So its safe to retry. | ||
| mc.log(err) | ||
| return "", ErrInvalidConn | ||
| return "", driver.ErrBadConn |
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This is simply a bug fix. Since it did not close the connection and also did not return ErrBadConn, if the connection was in a state where takeCompleteBuffer() failed for any reason, ErrInvalidConn could be returned repeatedly, depending on how the application was used.
This fix may need to be backported. I will create a separate PR.
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Actionable comments posted: 7
Review details
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Review profile: CHILL
Files selected for processing (3)
- connection.go (10 hunks)
- errors.go (1 hunks)
- packets.go (9 hunks)
Additional context used
golangci-lint
Additional comments not posted (3)
errors.go (1)
Line range hint
1-1: Ensure that the removal oferrBadConnNoWriteis reflected in the entire codebase.Verification successful
The search for
errBadConnNoWritedid not produce any results, indicating that the error has been successfully removed from the codebase.
Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash # Description: Verify that `errBadConnNoWrite` is completely removed from the codebase. # Test: Search for the removed error. Expect: No occurrences. rg --type go $'errBadConnNoWrite'Length of output: 32
Script:
#!/bin/bash # Description: Verify that there are no references to `errBadConnNoWrite` in the codebase. # Test: Search for any references to the removed error. Expect: No occurrences. rg 'errBadConnNoWrite'Length of output: 22
connection.go (2)
688-696: Validate the implementation of interfaces.The implementation of the
driver.SessionResetteranddriver.Validatorinterfaces in themysqlConnstruct is correct and follows the expected patterns.
342-342: Check for potential data races or concurrency issues.Verification successful
The analysis did not reveal any potential data races or concurrency issues in the
connection.gofile. The functions and methods do not use concurrency primitives or shared state that would typically lead to data races.
- No
gostatements,syncpackage usage, or other concurrency-related patterns were found in the critical functions.- No global variables or constants that could indicate shared state across multiple functions were found.
Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash # Description: Check for potential data races in the `exec` method. # Test: Run Go's race detector on the `connection.go` file. go run -race ./connection.goLength of output: 100
Script:
#!/bin/bash # Locate Go files in the repository fd -e go # Check for the `exec` method in the `connection.go` file ast-grep --lang go --pattern 'func exec($_, $_) $_' connection.goLength of output: 513
Script:
#!/bin/bash # Description: Check for potential data races in the `exec` method. # Ensure Go environment is set up correctly and rerun the race detector if command -v go &> /dev/null then go run -race ./connection.go else echo "Go environment is not set up correctly." fiLength of output: 104
Script:
#!/bin/bash # Search for the `exec` method in the `connection.go` file rg 'func exec' connection.goLength of output: 30
Script:
#!/bin/bash # List all methods in the `connection.go` file ast-grep --lang go --pattern 'func $_($_) $_' connection.goLength of output: 61
Script:
#!/bin/bash # Search for the `func` keyword in the `connection.go` file to list all functions rg 'func ' connection.goLength of output: 1911
Script:
#!/bin/bash # Search for potential data races in critical functions by looking for concurrency primitives and patterns # Functions to analyze functions=("Exec" "exec" "Query" "query" "Begin" "BeginTx" "Close" "Ping" "Prepare" "PrepareContext" "ExecContext" "QueryContext") # Search for `go` statements, `sync` package usage, and shared variable access in the specified functions for func in "${functions[@]}"; do echo "Analyzing function: $func" rg "func $func" -A 20 connection.go | rg -e 'go ' -e 'sync\.' -e '\*sync\.' -e '\.Lock' -e '\.Unlock' -e '\.RLock' -e '\.RUnlock' -e '\.Wait' -e '\.Signal' -e '\.Broadcast' doneLength of output: 3417
Script:
#!/bin/bash # Search for global variables and shared state in the `connection.go` file # Search for variable declarations that might indicate shared state rg 'var ' connection.go rg 'const ' connection.goLength of output: 236
| @@ -344,15 +331,15 @@ func (mc *mysqlConn) Exec(query string, args []driver.Value) (driver.Result, err | |||
| copied := mc.result | |||
| return &copied, err | |||
| } | |||
| return nil, mc.markBadConn(err) | |||
| return nil, err | |||
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Review the error handling in the Exec method.
The error handling in the Exec method should be consistent and clear. Consider adding more specific error messages or handling for different error scenarios.
| @@ -140,7 +129,7 @@ | |||
| if err == nil { | |||
| return &mysqlTx{mc}, err | |||
| } | |||
| return nil, mc.markBadConn(err) | |||
| return nil, err | |||
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Ensure proper error handling and propagation.
The error handling in the begin method should be consistent and clear. Consider adding more specific error messages or handling for different error scenarios.
| if err != nil { | ||
| mc.cleanup() | ||
| mc.log(ErrMalformPkt) | ||
| } else { | ||
| if cerr := mc.canceled.Value(); cerr != nil { | ||
| return cerr | ||
| } | ||
| if n == 0 && pktLen == len(data)-4 { | ||
| // only for the first loop iteration when nothing was written yet | ||
| return errBadConnNoWrite | ||
| } | ||
| return err | ||
| } |
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Consider handling specific I/O errors more gracefully.
The current implementation returns the raw error directly to the caller. It might be beneficial to classify certain types of I/O errors and handle them differently, such as temporary network errors which could be retried. This would make the error handling more robust and potentially reduce connection failures due to transient issues.
| // io.Writer(b) must return a non-nil error if it cannot write len(b) bytes. | ||
| // The io.ErrShortWrite error is used to indicate that this rule has not been followed. | ||
| mc.cleanup() | ||
| mc.log(err) | ||
| return io.ErrShortWrite |
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Ensure proper error handling when io.ErrShortWrite occurs.
The current implementation returns io.ErrShortWrite directly. It might be useful to add a log statement before returning the error for better debugging and operational visibility.
| mc.cleanup() | ||
| return err |
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Refactor repeated error handling patterns.
There is a repeated pattern where a buffer acquisition fails and mc.cleanup() is called before returning the error. This pattern could be abstracted into a helper method to reduce code duplication and improve maintainability.
- mc.cleanup()
- return err
+ return handleBufferAcquisitionError(mc, err)And then define the helper function:
func handleBufferAcquisitionError(mc *mysqlConn, err error) error {
mc.cleanup()
return err
}Also applies to: 391-392, 411-412, 430-431, 451-452
| // https:https://dev.mysql.com/doc/dev/mysql-server/latest/page_protocol_com_query_response.html | ||
| func (mc *okHandler) readResultSetHeaderPacket() (int, error) { | ||
| // handleOkPacket replaces both values; other cases leave the values unchanged. | ||
| mc.result.affectedRows = append(mc.result.affectedRows, 0) | ||
| mc.result.insertIds = append(mc.result.insertIds, 0) | ||
|
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| data, err := mc.conn().readPacket() | ||
| if err == nil { | ||
| switch data[0] { | ||
|
|
||
| case iOK: | ||
| return 0, mc.handleOkPacket(data) | ||
| if err != nil { | ||
| return 0, err | ||
| } | ||
|
|
||
| case iERR: | ||
| return 0, mc.conn().handleErrorPacket(data) | ||
| switch data[0] { | ||
| case iOK: | ||
| return 0, mc.handleOkPacket(data) | ||
|
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| case iLocalInFile: | ||
| return 0, mc.handleInFileRequest(string(data[1:])) | ||
| } | ||
| case iERR: | ||
| return 0, mc.conn().handleErrorPacket(data) | ||
|
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| // column count | ||
| num, _, _ := readLengthEncodedInteger(data) | ||
| // ignore remaining data in the packet. see #1478. | ||
| return int(num), nil | ||
| case iLocalInFile: | ||
| return 0, mc.handleInFileRequest(string(data[1:])) | ||
| } | ||
| return 0, err | ||
|
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| // column count | ||
| // https://dev.mysql.com/doc/dev/mysql-server/latest/page_protocol_com_query_response_text_resultset.html | ||
| num, _, _ := readLengthEncodedInteger(data) | ||
| // ignore remaining data in the packet. see #1478. | ||
| return int(num), nil |
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Optimize the handling of result set headers.
The method readResultSetHeaderPacket could be optimized by directly returning the error from handleOkPacket and handleErrorPacket without the intermediate assignment to data and err. This would simplify the control flow and potentially improve performance by reducing unnecessary variable assignments.
- data, err := mc.conn().readPacket()
- if err != nil {
- return 0, err
- }
- switch data[0] {
- case iOK:
- return 0, mc.handleOkPacket(data)
- case iERR:
- return 0, mc.conn().handleErrorPacket(data)
- case iLocalInFile:
- return 0, mc.handleInFileRequest(string(data[1:]))
- }
+ data, err := mc.conn().readPacket()
+ if err != nil {
+ return 0, err
+ }
+ return 0, mc.handlePacketBasedOnType(data)And then define the helper function:
func (mc *okHandler) handlePacketBasedOnType(data []byte) error {
switch data[0] {
case iOK:
return mc.handleOkPacket(data)
case iERR:
return mc.conn().handleErrorPacket(data)
case iLocalInFile:
return mc.handleInFileRequest(string(data[1:]))
default:
return fmt.Errorf("unknown packet type: %v", data[0])
}
}| mc.cleanup() | ||
| return err |
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Handle buffer acquisition failures more gracefully.
When buffer acquisition fails, the method writeExecutePacket simply cleans up and returns the error. Consider implementing a retry mechanism or a more informative error message to help diagnose issues related to buffer allocation failures.
Description
Fix #1582.
Checklist
Summary by CodeRabbit
New Features
IsValidmethod to enhance connection validation.SessionResetterandValidatorinterfaces for improved session management.Bug Fixes
Refactor
Chores