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Make fileRegister a set #1653

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merged 1 commit into from
Dec 24, 2024

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arturmelanchyk
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@arturmelanchyk arturmelanchyk commented Dec 21, 2024

Description

Please explain the changes you made here.

Checklist

  • Code compiles correctly
  • Created tests which fail without the change (if possible)
  • All tests passing
  • Extended the README / documentation, if necessary
  • Added myself / the copyright holder to the AUTHORS file

Summary by CodeRabbit

  • Chores

    • Updated the AUTHORS file to include a new contributor: Artur Melanchyk.
  • Refactor

    • Optimized the fileRegister variable type in the mysql package for improved memory efficiency.

Signed-off-by: Artur Melanchyk <[email protected]>
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coderabbitai bot commented Dec 21, 2024

Walkthrough

The pull request introduces two distinct changes: an update to the AUTHORS file by adding a new contributor, Artur Melanchyk, and a modification in the infile.go file of the Go-MySQL-Driver project. The code change involves refactoring the fileRegister variable from using a boolean map to an empty struct map, which provides a more memory-efficient approach to tracking registered files without altering the core logic of file registration.

Changes

File Change Summary
AUTHORS Added new author Artur Melanchyk with email [email protected]
infile.go Refactored fileRegister from map[string]bool to map[string]struct{}

Sequence Diagram

sequenceDiagram
    participant Code as Code
    participant FileRegister as File Registration
    
    Code->>FileRegister: RegisterLocalFile()
    FileRegister-->>Code: Check file existence
    alt File Not Registered
        FileRegister->>FileRegister: Add file to register
    else File Already Registered
        FileRegister-->>Code: Prevent duplicate registration
    end
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Poem

🐰 A rabbit's ode to code so neat,
Where structs replace bools, a memory treat!
Artur joins the team with a smile,
Optimizing maps with rabbit-like style
Go MySQL, you're looking quite fine! 🚀

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📜 Recent review details

Configuration used: CodeRabbit UI
Review profile: CHILL
Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between b335ed3 and fdf54ed.

📒 Files selected for processing (2)
  • AUTHORS (1 hunks)
  • infile.go (3 hunks)
✅ Files skipped from review due to trivial changes (1)
  • AUTHORS
🔇 Additional comments (4)
infile.go (4)

20-20: Excellent optimization using empty struct for set implementation!

Using map[string]struct{} instead of map[string]bool is a memory-efficient way to implement sets in Go. Empty structs occupy 0 bytes, making this a proper idiomatic Go solution.


40-40: LGTM - Consistent implementation of the set pattern

The changes correctly implement the empty struct set pattern while maintaining the existing lazy initialization and thread-safety through proper lock usage.

Also applies to: 43-43


126-128: LGTM - Improved readability with equivalent logic

The change from boolean retrieval to key existence check is logically equivalent, and the new variable name exists better describes its purpose. The thread safety is properly maintained with RLock.


Line range hint 20-128: Verify performance impact in concurrent scenarios

While the changes are correct and more memory-efficient, let's verify the performance in concurrent scenarios.

✅ Verification successful

No performance concerns in concurrent scenarios

The implementation is safe and efficient for the following reasons:

  • The code uses appropriate locking mechanisms (RWMutex) for both maps
  • File/Reader registration is not in any performance-critical paths - it's used during setup for LOAD DATA LOCAL INFILE operations
  • The implementation is used sparsely in tests with no concurrent access patterns
  • The maps are lazily initialized which is memory efficient
  • The locking is fine-grained and held only for map operations
🏁 Scripts executed

The following scripts were executed for the analysis:

Script:

#!/bin/bash
# Description: Check for concurrent test coverage and benchmarks

# Look for concurrent tests
rg -l "go test" .
rg -l "testing.B" .
rg -l "sync/atomic" .
rg -l "fileRegister.*go.*func" .

# Check for any existing performance benchmarks
rg -l "Benchmark.*File.*Register" .

Length of output: 249


Script:

#!/bin/bash
# Let's examine the test files and benchmark implementations

# Check test coverage for file registration
rg -A 10 "func.*Test.*File.*Register" .

# Look at benchmark implementations
rg -A 10 "func.*Benchmark" benchmark_test.go

# Check concurrent access patterns in tests
rg -A 10 "go func.*fileRegister" .
rg -A 10 "go func.*readerRegister" .

# Look for any race condition tests
rg -A 5 "race|parallel" driver_test.go

Length of output: 4447


Script:

#!/bin/bash
# Let's check the actual implementation and usage of file registration

# Check for any concurrent usage of RegisterLocalFile/RegisterReaderHandler
rg -B 5 -A 5 "RegisterLocalFile|RegisterReaderHandler" .

# Look for any test files we might have missed
fd -e test.go -x rg -l "Register.*File|Register.*Reader" {}

# Check if there are any goroutines accessing these registers
rg "go .*\(" -A 5 -B 5 . | rg -B 5 -A 5 "fileRegister|readerRegister"

Length of output: 4331


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@coveralls
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Coverage Status

coverage: 83.141%. remained the same
when pulling fdf54ed on arturmelanchyk:fil-register-set
into b335ed3 on go-sql-driver:master.

@methane methane merged commit 7403860 into go-sql-driver:master Dec 24, 2024
38 checks passed
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3 participants