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@SadikSunbul SadikSunbul commented Feb 3, 2025

This PR aims to add a new storage implementation for the LevelDB database.

Thank you for your reviews 🙏

Summary by CodeRabbit

  • New Features
    • Introduced a fast, configurable key-value storage solution featuring expiration management. Basic operations like retrieval, update, deletion, and clearing of data are now supported.
  • Documentation
    • Added a new README for the LevelDB storage implementation, including installation instructions, configuration options, and usage examples.
    • Updated the main README to include a link and test status badge for the LevelDB implementation.
  • Tests
    • Implemented extensive tests to validate core functionalities, including data persistence, timeout handling, and cleanup processes.
    • Added benchmarks to measure performance for key operations.

@SadikSunbul SadikSunbul requested a review from a team as a code owner February 3, 2025 18:35
@SadikSunbul SadikSunbul requested review from ReneWerner87, efectn, gaby and sixcolors and removed request for a team February 3, 2025 18:35
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coderabbitai bot commented Feb 3, 2025

Walkthrough

This pull request introduces a new LevelDB storage implementation for the GoFiber framework. It adds comprehensive documentation, a configuration structure with default values, and a set of CRUD methods (New, Get, Set, Delete, Reset, Close, Conn) for managing key-value pairs with expiration support. Additionally, it includes a garbage collection mechanism to remove expired items and extensive unit tests to verify configuration settings and storage operations.

Changes

File(s) Change Summary
leveldb/README.md, leveldb/config.go, leveldb/leveldb.go Introduced full documentation and implementation of LevelDB storage, including a new configuration structure (Config and ConfigDefault), exported CRUD methods, and a garbage collection mechanism for expired keys.
leveldb/config_test.go, leveldb/leveldb_test.go Added unit tests validating configuration options, key-value operations, expiration handling, deletion, reset, and proper shutdown of the LevelDB storage implementation.
README.md Added a new entry for LevelDB storage implementation under the "Storage Implementations" section, including a link to the LevelDB README and a badge for test status.

Possibly related PRs

  • 🔥 feat: Add support for Neo4j #1562: The changes in the main PR are related to the addition of methods and a configuration struct for LevelDB, while the retrieved PR introduces similar methods and a configuration struct for Neo4j, indicating a parallel implementation approach for both storage systems.
  • feat: Clickhouse Storage Driver #1342: The changes in the main PR and the retrieved PR are related as both introduce a New function and methods (Get, Set, Delete, Reset, Close, Conn) for managing storage, along with a Config struct for configuration options, indicating a similar structure and functionality in their implementations.

Suggested labels

📒 Documentation

Suggested reviewers

  • gaby
  • ReneWerner87
  • sixcolors
  • efectn

Poem

I'm a little bunny, hopping with delight,
New LevelDB code shines ever so bright.
Keys and values dance in a neat little line,
While garbage collects old data just fine.
With tests and configs, the code feels so right,
I nibble on changes from morning to night!
🐰🌟


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@ReneWerner87
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thx

  • please add the new storage to the list in the README.md in the first level of the repository
  • please add a new workflow for the test run

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Actionable comments posted: 4

🧹 Nitpick comments (4)
leveldb/config_test.go (1)

9-19: Consider adding more test cases for configuration validation.

The test only validates the MaxOpenFiles setting. Consider adding test cases for other configuration options like CacheSize, BlockSize, etc.

leveldb/config.go (1)

110-163: Add validation for configuration values.

The configDefault function only checks if values are <= 0, but some fields might need additional validation (e.g., MaxOpenFiles should have a reasonable minimum value).

func configDefault(config ...Config) Config {
	// ... existing code ...

+	// Validate minimum values
+	if cfg.MaxOpenFiles < 50 {
+		cfg.MaxOpenFiles = 50 // Ensure a reasonable minimum
+	}
+	if cfg.CacheSize > 1024 {
+		cfg.CacheSize = 1024 // Limit maximum cache size to 1GB
+	}
+	if cfg.GCInterval < time.Minute {
+		cfg.GCInterval = time.Minute // Ensure reasonable GC interval
+	}

	return cfg
}
leveldb/README.md (2)

12-15: Introduction and Go Version Note

The description succinctly introduces LevelDB as a fast key-value store using the syndtr/goleveldb package. The Go version requirement is prominently noted. However, instead of using bold text for the note (line 14), consider using a proper heading (e.g., ## Note: Requires Go 1.23.1 and above) to align with common Markdown practices.

🧰 Tools
🪛 markdownlint-cli2 (0.17.2)

14-14: Emphasis used instead of a heading
null

(MD036, no-emphasis-as-heading)


72-151: Configuration Struct Documentation

The Config struct is well-documented with inline comments explaining each field and its default value. However, there are multiple static analysis warnings regarding the use of hard tabs in this code block. Replacing these hard tabs with spaces would improve readability and ensure compliance with Markdown linting (MD010) guidelines.

🧰 Tools
🪛 markdownlint-cli2 (0.17.2)

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📜 Review details

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

📥 Commits

Reviewing files that changed from the base of the PR and between e4abddc and de3b493.

⛔ Files ignored due to path filters (2)
  • leveldb/go.mod is excluded by !**/*.mod
  • leveldb/go.sum is excluded by !**/*.sum, !**/*.sum
📒 Files selected for processing (5)
  • leveldb/README.md (1 hunks)
  • leveldb/config.go (1 hunks)
  • leveldb/config_test.go (1 hunks)
  • leveldb/leveldb.go (1 hunks)
  • leveldb/leveldb_test.go (1 hunks)
🧰 Additional context used
🪛 GitHub Check: lint (leveldb)
leveldb/leveldb.go

[failure] 61-61:
[golangci] reported by reviewdog 🐶
Error return value of s.db.Delete is not checked (errcheck)

Raw Output:
leveldb.go:61:14: Error return value of s.db.Delete is not checked (errcheck)
s.db.Delete(key, nil)
^

🪛 golangci-lint (1.62.2)
leveldb/leveldb.go

61-61: Error return value of s.db.Delete is not checked

(errcheck)

leveldb/leveldb_test.go

41-41: Error return value of db.Set is not checked

(errcheck)


42-42: Error return value of db.Set is not checked

(errcheck)


55-55: Error return value of db.Set is not checked

(errcheck)


103-103: Error return value of db.Reset is not checked

(errcheck)

🪛 GitHub Actions: Golangci-Lint Check
leveldb/leveldb.go

[error] 61-61: Error return value of s.db.Delete is not checked (errcheck)

🪛 LanguageTool
leveldb/README.md

[style] ~6-~6: Using many exclamation marks might seem excessive (in this case: 3 exclamation marks for a text that’s 1020 characters long)
Context: .../v/tag/gofiber/storage?filter=leveldb*) Discord Test ![Security](https://img.shields.io/github...

(EN_EXCESSIVE_EXCLAMATION)

🪛 markdownlint-cli2 (0.17.2)
leveldb/README.md

14-14: Emphasis used instead of a heading
null

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🔇 Additional comments (9)
leveldb/leveldb.go (1)

126-159: ⚠️ Potential issue

Protect against potential data races in gc routine.

The garbage collection routine accesses the database without synchronization, which could lead to data races. Consider using a mutex to protect database operations.

type Storage struct {
	db         *leveldb.DB
	gcInterval time.Duration
	done       chan struct{}
+	mu         sync.RWMutex
}

func (s *Storage) gc() {
	ticker := time.NewTicker(s.gcInterval)
	defer ticker.Stop()

	for {
		select {
		case <-s.done:
			return
		case <-ticker.C:
+			s.mu.Lock()
			iter := s.db.NewIterator(nil, nil)
			batch := new(leveldb.Batch)
			// ... rest of the code ...
			if batch.Len() > 0 {
				_ = s.db.Write(batch, nil)
			}
+			s.mu.Unlock()
		}
	}
}

Likely invalid or redundant comment.

leveldb/README.md (8)

1-5: YAML Front Matter is well defined.

The front matter clearly specifies the module's ID and title using YAML, which will help in proper metadata management.


6-11: Badge Section Review

The badge links effectively convey project status (release, test, security, linter) and community information. Ensure that these URLs remain up-to-date with the repository's status.

🧰 Tools
🪛 LanguageTool

[style] ~6-~6: Using many exclamation marks might seem excessive (in this case: 3 exclamation marks for a text that’s 1020 characters long)
Context: .../v/tag/gofiber/storage?filter=leveldb*) Discord Test ![Security](https://img.shields.io/github...

(EN_EXCESSIVE_EXCLAMATION)


16-23: Table of Contents Clarity

The Table of Contents is well-organized, making it easy for readers to navigate through the document.


24-34: Function Signatures Overview

The Signatures section clearly lists the public API functions available in the LevelDB storage implementation. It’s important to verify that these signatures match the corresponding implementations in leveldb/leveldb.go.


36-42: Installation Instructions

The installation steps, including module initialization and the setup commands, are concise and clear. This should help new users get started quickly.


44-48: Package Installation Command

The instruction to install the leveldb implementation using go get is straightforward and correct. No issues found.


50-70: Examples Section Review

The examples demonstrate how to initialize the storage using both default and custom configurations. One point to note: the custom configuration snippet shows GCInterval set to 10 * time.Second, whereas in the default configuration later, it is set to 10 * time.Minute. Please verify that this discrepancy is intentional.

🧰 Tools
🪛 markdownlint-cli2 (0.17.2)

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153-178: Default Configuration Settings

The ConfigDefault variable provides clear default settings, including a dynamic assignment for MaxOpenFiles based on the operating system. Similar to the Config struct, several hard tabs are used in this block. Converting these to spaces will help maintain consistency with Markdown styling best practices. Additionally, please ensure the default GCInterval of 10 * time.Minute is the intended value, especially in light of the shorter interval shown in the custom example.

🧰 Tools
🪛 markdownlint-cli2 (0.17.2)

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Actionable comments posted: 2

♻️ Duplicate comments (1)
leveldb/leveldb_test.go (1)

70-70: 🛠️ Refactor suggestion

Replace time.Sleep with deterministic approaches.

Using time.Sleep can make tests flaky. Consider using a more deterministic approach with shorter intervals and polling.

Also applies to: 142-142

🧹 Nitpick comments (1)
leveldb/leveldb_test.go (1)

182-182: Document error handling in benchmarks.

While ignoring errors in benchmarks is common for performance reasons, it should be documented to avoid confusion.

Add comments to explain why errors are ignored:

-			_ = db.Set(key, value, 0)
+			// Errors are ignored in benchmarks for performance
+			_ = db.Set(key, value, 0)

Also applies to: 202-202, 220-220

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  • README.md (1 hunks)
  • leveldb/leveldb_test.go (1 hunks)
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README.md

80-80: Images should have alternate text (alt text)
null

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leveldb/leveldb_test.go

42-42: Error return value of db.Set is not checked

(errcheck)


43-43: Error return value of db.Set is not checked

(errcheck)


56-56: Error return value of db.Set is not checked

(errcheck)


104-104: Error return value of db.Reset is not checked

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🔇 Additional comments (1)
leveldb/leveldb_test.go (1)

12-14: LGTM!

The helper function is well-designed for test cleanup.

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Actionable comments posted: 1

♻️ Duplicate comments (1)
leveldb/leveldb_test.go (1)

39-121: 🛠️ Refactor suggestion

Add error checks and make expiration tests more reliable.

Several improvements needed:

  1. Missing error checks for db.Set operations (as previously noted)
  2. Flaky tests using time.Sleep
  3. Cleanup should use t.Cleanup()
 func Test_Set_Overwrite(t *testing.T) {
+    t.Cleanup(func() {
+        require.NoError(t, removeAllFiles("./fiber.leveldb"))
+    })
     db := New()
-    db.Set([]byte("key"), []byte("value"), time.Second*1)
-    db.Set([]byte("key"), []byte("value2"), time.Second*1)
+    require.NoError(t, db.Set([]byte("key"), []byte("value"), time.Second*1))
+    require.NoError(t, db.Set([]byte("key"), []byte("value2"), time.Second*1))
     value, err := db.Get([]byte("key"))
     require.Nil(t, err)
     require.Equal(t, []byte("value2"), value)
-    err = removeAllFiles("./fiber.leveldb")
-    require.Nil(t, err)
 }

 func Test_Get_ForExpired100Millisecond(t *testing.T) {
+    t.Cleanup(func() {
+        require.NoError(t, removeAllFiles("./fiber.leveldb"))
+    })
     db := New()
-    db.Set([]byte("key"), []byte("value"), time.Millisecond*100)
+    require.NoError(t, db.Set([]byte("key"), []byte("value"), time.Millisecond*100))

-    time.Sleep(time.Millisecond * 150)
+    // Wait for expiration with exponential backoff
+    deadline := time.Now().Add(time.Second)
+    for time.Now().Before(deadline) {
+        value, err := db.Get([]byte("key"))
+        if err == nil && value == nil {
+            break
+        }
+        time.Sleep(time.Millisecond * 10)
+    }

     value, err := db.Get([]byte("key"))
     require.Nil(t, err)
     require.Nil(t, value)
-    err = removeAllFiles("./fiber.leveldb")
-    require.Nil(t, err)
 }
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42-42: Error return value of db.Set is not checked

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43-43: Error return value of db.Set is not checked

(errcheck)


56-56: Error return value of db.Set is not checked

(errcheck)


104-104: Error return value of db.Reset is not checked

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🧹 Nitpick comments (4)
leveldb/leveldb_test.go (4)

12-14: Consider enhancing test cleanup reliability.

The cleanup function could be more robust by:

  1. Ensuring the directory exists before removal
  2. Adding retries for Windows systems where file handles might not be immediately released
 func removeAllFiles(dir string) error {
+    // Ensure cleanup even if directory doesn't exist
+    if _, err := os.Stat(dir); os.IsNotExist(err) {
+        return nil
+    }
+    // Add retries for Windows systems
+    for i := 0; i < 3; i++ {
+        err := os.RemoveAll(dir)
+        if err == nil || os.IsNotExist(err) {
+            return nil
+        }
+        time.Sleep(time.Millisecond * 100)
+    }
     return os.RemoveAll(dir)
 }

16-37: Enhance configuration tests with edge cases and proper cleanup.

The configuration tests could be improved by:

  1. Testing invalid paths
  2. Using t.Cleanup() for reliable cleanup
  3. Testing more configuration options
 func Test_New_EmptyConfig(t *testing.T) {
+    t.Cleanup(func() {
+        require.NoError(t, removeAllFiles("./fiber.leveldb"))
+    })
     db := New()
     require.NotNil(t, db)
     _, err := os.Stat("./fiber.leveldb")
     require.Nil(t, err)
-    err = removeAllFiles("./fiber.leveldb")
-    require.Nil(t, err)
 }

 func Test_New_WithConfig(t *testing.T) {
+    t.Cleanup(func() {
+        require.NoError(t, removeAllFiles("./testdb"))
+    })
+    // Test invalid path
+    invalidDB := New(Config{
+        DBPath: "/invalid/path/that/doesnt/exist",
+    })
+    require.NotNil(t, invalidDB)
+
     db := New(Config{
         DBPath: "./testdb",
     })
     require.NotNil(t, db)
     _, err := os.Stat("./testdb")
     require.Nil(t, err)
-    err = removeAllFiles("./testdb")
-    require.Nil(t, err)
 }

170-185: Consider adding more channel-related tests.

The channel test is good but could be expanded to cover:

  1. Multiple close calls
  2. Concurrent operations during close
  3. GC channel behavior
+func Test_Close_Multiple(t *testing.T) {
+    t.Cleanup(func() {
+        require.NoError(t, removeAllFiles("./fiber.leveldb"))
+    })
+    db := New()
+    require.NoError(t, db.Close())
+    require.Error(t, db.Close(), "second close should error")
+}
+
+func Test_Close_Concurrent(t *testing.T) {
+    t.Cleanup(func() {
+        require.NoError(t, removeAllFiles("./fiber.leveldb"))
+    })
+    db := New()
+    var wg sync.WaitGroup
+    wg.Add(2)
+    go func() {
+        defer wg.Done()
+        _ = db.Set([]byte("key"), []byte("value"), 0)
+    }()
+    go func() {
+        defer wg.Done()
+        _ = db.Close()
+    }()
+    wg.Wait()
+}

187-252: Enhance benchmarks with more scenarios.

The benchmarks are good but could be improved by:

  1. Testing different value sizes
  2. Adding batch operation benchmarks
  3. Testing with different expiration times
+func Benchmark_Set_LargeValue(b *testing.B) {
+    db := New()
+    defer func() {
+        _ = db.Close()
+        _ = removeAllFiles("./fiber.leveldb")
+    }()
+
+    value := make([]byte, 1024*1024) // 1MB value
+    rand.Read(value)
+
+    b.ResetTimer()
+    b.RunParallel(func(pb *testing.PB) {
+        var i int
+        for pb.Next() {
+            key := []byte(fmt.Sprintf("key_%d", i))
+            if err := db.Set(key, value, 0); err != nil {
+                b.Fatal(err)
+            }
+            i++
+        }
+    })
+}
+
+func Benchmark_Set_WithExpiration(b *testing.B) {
+    db := New()
+    defer func() {
+        _ = db.Close()
+        _ = removeAllFiles("./fiber.leveldb")
+    }()
+
+    b.ResetTimer()
+    b.RunParallel(func(pb *testing.PB) {
+        var i int
+        for pb.Next() {
+            key := []byte(fmt.Sprintf("key_%d", i))
+            value := []byte(fmt.Sprintf("value_%d", i))
+            if err := db.Set(key, value, time.Hour); err != nil {
+                b.Fatal(err)
+            }
+            i++
+        }
+    })
+}
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  • leveldb/leveldb_test.go (1 hunks)
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  • leveldb/config_test.go
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leveldb/leveldb_test.go

42-42: Error return value of db.Set is not checked

(errcheck)


43-43: Error return value of db.Set is not checked

(errcheck)


56-56: Error return value of db.Set is not checked

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104-104: Error return value of db.Reset is not checked

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Actionable comments posted: 1

♻️ Duplicate comments (1)
leveldb/leveldb_test.go (1)

39-51: ⚠️ Potential issue

Add error checking for Set operations.

The test is missing error checks for db.Set operations which could fail silently.

Apply this pattern throughout the tests:

-db.Set([]byte("key"), []byte("value"), time.Second*1)
-db.Set([]byte("key"), []byte("value2"), time.Second*1)
+require.NoError(t, db.Set([]byte("key"), []byte("value"), time.Second*1))
+require.NoError(t, db.Set([]byte("key"), []byte("value2"), time.Second*1))
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42-42: Error return value of db.Set is not checked

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43-43: Error return value of db.Set is not checked

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🧹 Nitpick comments (4)
leveldb/leveldb_test.go (4)

12-14: Use t.Cleanup consistently across all tests.

Some tests use t.Cleanup while others manually call removeAllFiles. For consistency and to ensure cleanup even if tests fail, use t.Cleanup in all tests.

Example pattern to apply:

 func Test_New_EmptyConfig(t *testing.T) {
+    t.Cleanup(func() {
+        require.NoError(t, removeAllFiles("./fiber.leveldb"))
+    })
     db := New()
     require.NotNil(t, db)
-    
     _, err := os.Stat("./fiber.leveldb")
     require.Nil(t, err)
-
-    err = removeAllFiles("./fiber.leveldb")
-    require.Nil(t, err)
 }

16-37: Enhance initialization test coverage.

The initialization tests could be more comprehensive:

  1. Verify default configuration values when using empty config
  2. Add error handling for New() which might fail
  3. Test invalid configurations (e.g., invalid paths)

Example additions:

func Test_New_DefaultConfig(t *testing.T) {
    t.Cleanup(func() {
        require.NoError(t, removeAllFiles("./fiber.leveldb"))
    })
    
    db := New()
    require.NotNil(t, db)
    
    // Verify default values
    cfg := db.config
    require.Equal(t, "./fiber.leveldb", cfg.DBPath)
    require.Equal(t, time.Minute*10, cfg.GCInterval)
}

func Test_New_InvalidConfig(t *testing.T) {
    db := New(Config{
        DBPath: "/invalid/path/that/doesnt/exist",
    })
    require.NotNil(t, db)
    
    // Verify that operations fail gracefully
    err := db.Set([]byte("key"), []byte("value"), 0)
    require.Error(t, err)
}

70-70: Translate comments to English.

For consistency and maintainability, comments should be in English:

-// Anahtarın silinmesini bekle
+// Wait for the key to be deleted

-GCInterval: time.Hour, // Uzun aralık
+GCInterval: time.Hour, // Long interval

-// GC çalışmadığı için değer hala var olmalı
+// Value should still exist as GC hasn't run yet

Also applies to: 188-188, 192-192


222-287: Consider adding benchmark cases with different payload sizes.

The benchmarks effectively test parallel operations but could be more comprehensive by testing different payload sizes to understand performance characteristics better.

Example additions:

func Benchmark_Set_LargePayload(b *testing.B) {
    db := New()
    defer func() {
        _ = db.Close()
        _ = removeAllFiles("./fiber.leveldb")
    }()
    
    largeValue := make([]byte, 1024*1024) // 1MB payload
    
    b.ResetTimer()
    b.RunParallel(func(pb *testing.PB) {
        var i int
        for pb.Next() {
            key := []byte(fmt.Sprintf("key_%d", i))
            if err := db.Set(key, largeValue, 0); err != nil {
                b.Fatal(err)
            }
            i++
        }
    })
}
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leveldb/leveldb_test.go

42-42: Error return value of db.Set is not checked

(errcheck)


43-43: Error return value of db.Set is not checked

(errcheck)


56-56: Error return value of db.Set is not checked

(errcheck)


112-112: Error return value of db.Reset is not checked

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🔇 Additional comments (2)
leveldb/leveldb_test.go (2)

131-141: LGTM! Close tests are thorough.

The tests effectively verify both the functional aspect (operations failing after close) and implementation details (channel closure).

Also applies to: 205-220


143-203: LGTM! GC tests follow best practices.

The garbage collection tests effectively verify the functionality using polling with deadlines instead of fixed sleeps, which makes the tests more reliable.

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Actionable comments posted: 0

♻️ Duplicate comments (1)
leveldb/leveldb_test.go (1)

42-43: ⚠️ Potential issue

Add error checking for Set operations.

The Set operations should check for errors to ensure test validity.

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42-42: Error return value of db.Set is not checked

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43-43: Error return value of db.Set is not checked

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🧹 Nitpick comments (4)
leveldb/leveldb_test.go (4)

12-14: Use t.Cleanup consistently across all tests.

Some tests use t.Cleanup() while others manually clean up. For consistency and to ensure cleanup even if tests fail, consider using t.Cleanup() throughout.

Example pattern to apply:

 func Test_New_EmptyConfig(t *testing.T) {
+    t.Cleanup(func() {
+        require.NoError(t, removeAllFiles("./fiber.leveldb"))
+    })
     db := New()
     require.NotNil(t, db)
-    
     _, err := os.Stat("./fiber.leveldb")
     require.Nil(t, err)
-
-    err = removeAllFiles("./fiber.leveldb")
-    require.Nil(t, err)
 }

65-86: Improve test readability by removing Turkish comments.

The comment "Anahtarın silinmesini bekle" should be in English for consistency and maintainability.

-    // Anahtarın silinmesini bekle
+    // Wait for the key to be deleted

88-103: Enhance Delete test coverage.

The Delete test should also verify behavior with:

  1. Non-existent keys
  2. Empty keys
  3. Special characters in keys

Example addition:

 func Test_Delete_WhileThereIsData(t *testing.T) {
     db := New()
+    t.Cleanup(func() {
+        require.NoError(t, removeAllFiles("./fiber.leveldb"))
+    })
 
     // Test existing key
     require.NoError(t, db.Set([]byte("key"), []byte("value"), time.Second*1))
     require.NoError(t, db.Delete("key"))
     value, err := db.Get([]byte("key"))
     require.Nil(t, err)
     require.Nil(t, value)
 
+    // Test non-existent key
+    err = db.Delete("non-existent")
+    require.NoError(t, err)
+
+    // Test empty key
+    err = db.Delete("")
+    require.NoError(t, err)
+
+    // Test special characters
+    require.NoError(t, db.Set([]byte("key!@#$"), []byte("value"), time.Second*1))
+    require.NoError(t, db.Delete("key!@#$"))
+    value, err = db.Get([]byte("key!@#$"))
+    require.Nil(t, err)
+    require.Nil(t, value)
 }

182-203: Translate Turkish comments to English.

For consistency and maintainability, all comments should be in English.

-    GCInterval: time.Hour, // Uzun aralık
+    GCInterval: time.Hour, // Long interval

-    // GC çalışmadığı için değer hala var olmalı
+    // Value should still exist as GC hasn't run yet
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leveldb/leveldb_test.go

42-42: Error return value of db.Set is not checked

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43-43: Error return value of db.Set is not checked

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56-56: Error return value of db.Set is not checked

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🔇 Additional comments (1)
leveldb/leveldb_test.go (1)

222-287: Well-structured benchmarks!

The benchmarks are well-implemented with:

  • Proper parallel execution
  • Good error handling
  • Clean cleanup using defer
  • Appropriate use of ResetTimer

@gaby gaby changed the title LevelDB support added 🔥 feat: Add LevelDB driver Feb 4, 2025
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Overall looks good, just small things here and there

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Actionable comments posted: 2

🧹 Nitpick comments (2)
leveldb/README.md (2)

14-14: Add specific Go version requirements.

The note should specify both minimum and maximum supported Go versions.

Apply this change:

-**Note: Requires Go 1.21 or later**
+**Note: Requires Go 1.21 or 1.22**
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14-14: Emphasis used instead of a heading
null

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74-150: Add configuration validation information.

The Config section should include information about validation of configuration values and any constraints.

Consider adding a note about:

  • Valid ranges for numeric values (e.g., minimum/maximum for CacheSize, BlockSize)
  • Validation behavior (e.g., what happens if invalid values are provided)
  • Impact of different configurations on performance
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leveldb/README.md

[style] ~6-~6: Using many exclamation marks might seem excessive (in this case: 3 exclamation marks for a text that’s 1017 characters long)
Context: .../v/tag/gofiber/storage?filter=leveldb*) Discord Test ![Security](https://img.shields.io/github...

(EN_EXCESSIVE_EXCLAMATION)

🪛 markdownlint-cli2 (0.17.2)
leveldb/README.md

14-14: Emphasis used instead of a heading
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🪛 golangci-lint (1.62.2)
leveldb/leveldb_test.go

41-41: Error return value of db.Set is not checked

(errcheck)


42-42: Error return value of db.Set is not checked

(errcheck)


55-55: Error return value of db.Set is not checked

(errcheck)

🔇 Additional comments (8)
leveldb/leveldb_test.go (7)

41-42: Add error checking for db.Set operations.

Test validity could be compromised if Set operations fail silently.

Apply this pattern:

-db.Set([]byte("key"), []byte("value"), time.Second*1)
-db.Set([]byte("key"), []byte("value2"), time.Second*1)
+require.NoError(t, db.Set([]byte("key"), []byte("value"), time.Second*1))
+require.NoError(t, db.Set([]byte("key"), []byte("value2"), time.Second*1))
🧰 Tools
🪛 golangci-lint (1.62.2)

41-41: Error return value of db.Set is not checked

(errcheck)


42-42: Error return value of db.Set is not checked

(errcheck)


55-55: Add error checking for db.Set operation.

Test validity could be compromised if Set operation fails silently.

Apply this pattern:

-db.Set([]byte("key"), []byte("value"), 0)
+require.NoError(t, db.Set([]byte("key"), []byte("value"), 0))
🧰 Tools
🪛 golangci-lint (1.62.2)

55-55: Error return value of db.Set is not checked

(errcheck)


69-77: LGTM! Good use of polling with deadline.

The implementation correctly uses a polling approach with deadline instead of time.Sleep, which helps avoid flaky tests.


90-90: Add error checking for db.Set operation.

Test validity could be compromised if Set operation fails silently.

Apply this pattern:

-db.Set([]byte("key"), []byte("value"), time.Second*1)
+require.NoError(t, db.Set([]byte("key"), []byte("value"), time.Second*1))

107-109: Add error checking for db.Set operations.

Test validity could be compromised if Set operations fail silently.

Apply this pattern:

-db.Set([]byte("key1"), []byte("value1"), time.Second*1)
-db.Set([]byte("key2"), []byte("value2"), time.Second*1)
-db.Set([]byte("key3"), []byte("value3"), time.Second*1)
+require.NoError(t, db.Set([]byte("key1"), []byte("value1"), time.Second*1))
+require.NoError(t, db.Set([]byte("key2"), []byte("value2"), time.Second*1))
+require.NoError(t, db.Set([]byte("key3"), []byte("value3"), time.Second*1))

11-13: LGTM!

The helper function is well-implemented and consistently used across tests for cleanup.


38-50: Add error checking for db.Set operations.

Test validity could be compromised if Set operations fail silently. Add error checking using require.NoError.

🧰 Tools
🪛 golangci-lint (1.62.2)

41-41: Error return value of db.Set is not checked

(errcheck)


42-42: Error return value of db.Set is not checked

(errcheck)

leveldb/README.md (1)

1-179: LGTM! Documentation is comprehensive and well-structured.

The README provides clear installation instructions, usage examples, and detailed configuration options. All essential aspects of the LevelDB driver are well documented.

🧰 Tools
🪛 LanguageTool

[style] ~6-~6: Using many exclamation marks might seem excessive (in this case: 3 exclamation marks for a text that’s 1017 characters long)
Context: .../v/tag/gofiber/storage?filter=leveldb*) Discord Test ![Security](https://img.shields.io/github...

(EN_EXCESSIVE_EXCLAMATION)

🪛 markdownlint-cli2 (0.17.2)

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Actionable comments posted: 0

🧹 Nitpick comments (2)
leveldb/leveldb_test.go (2)

11-13: Improve error handling in removeAllFiles helper.

Consider enhancing the helper function with better error handling and path validation.

 func removeAllFiles(dir string) error {
+    if dir == "" {
+        return fmt.Errorf("directory path cannot be empty")
+    }
+    if _, err := os.Stat(dir); os.IsNotExist(err) {
+        return nil // Already doesn't exist
+    }
     return os.RemoveAll(dir)
 }

69-69: Use English comments consistently.

Replace Turkish comments with English equivalents:

-    // Anahtarın silinmesini bekle
+    // Wait for the key to be deleted

-        GCInterval: time.Hour, // Uzun aralık
+        GCInterval: time.Hour, // Long interval

-    // GC çalışmadığı için değer hala var olmalı
+    // Value should still exist as GC hasn't run yet

Also applies to: 187-187, 191-191

📜 Review details

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

📥 Commits

Reviewing files that changed from the base of the PR and between 174e393 and 165b2ae.

📒 Files selected for processing (3)
  • leveldb/config.go (1 hunks)
  • leveldb/leveldb.go (1 hunks)
  • leveldb/leveldb_test.go (1 hunks)
🚧 Files skipped from review as they are similar to previous changes (2)
  • leveldb/config.go
  • leveldb/leveldb.go
🧰 Additional context used
🪛 golangci-lint (1.62.2)
leveldb/leveldb_test.go

41-41: Error return value of db.Set is not checked

(errcheck)


42-42: Error return value of db.Set is not checked

(errcheck)


55-55: Error return value of db.Set is not checked

(errcheck)

🔇 Additional comments (3)
leveldb/leveldb_test.go (3)

15-36: Use t.Cleanup() for consistent test cleanup.

Previous review comments suggested using t.Cleanup() for reliable cleanup. Let's maintain consistency.

 func Test_New_EmptyConfig(t *testing.T) {
+    t.Cleanup(func() {
+        require.NoError(t, removeAllFiles("./fiber.leveldb"))
+    })
     db := New()
     require.NotNil(t, db)

     _, err := os.Stat("./fiber.leveldb")
     require.Nil(t, err)
-
-    err = removeAllFiles("./fiber.leveldb")
-    require.Nil(t, err)
 }

 func Test_New_WithConfig(t *testing.T) {
+    t.Cleanup(func() {
+        require.NoError(t, removeAllFiles("./testdb"))
+    })
     db := New(Config{
         Path: "./testdb",
     })
     require.NotNil(t, db)
     _, err := os.Stat("./testdb")
     require.Nil(t, err)
-
-    err = removeAllFiles("./testdb")
-    require.Nil(t, err)
 }

38-102: Add error checking for database operations.

Static analysis and previous reviews indicate missing error checks for Set operations.

 func Test_Set_Overwrite(t *testing.T) {
     db := New()

-    db.Set([]byte("key"), []byte("value"), time.Second*1)
-    db.Set([]byte("key"), []byte("value2"), time.Second*1)
+    require.NoError(t, db.Set([]byte("key"), []byte("value"), time.Second*1))
+    require.NoError(t, db.Set([]byte("key"), []byte("value2"), time.Second*1))
     // ...
 }

 func Test_Get_For0Second(t *testing.T) {
     db := New()

-    db.Set([]byte("key"), []byte("value"), 0)
+    require.NoError(t, db.Set([]byte("key"), []byte("value"), 0))
     // ...
 }
🧰 Tools
🪛 golangci-lint (1.62.2)

41-41: Error return value of db.Set is not checked

(errcheck)


42-42: Error return value of db.Set is not checked

(errcheck)


55-55: Error return value of db.Set is not checked

(errcheck)


221-284: Simplify benchmark loops as suggested in previous reviews.

Previous reviews recommended simplifying the benchmark loops.

 func Benchmark_Set(b *testing.B) {
     // ...
     b.RunParallel(func(pb *testing.PB) {
         for pb.Next() {
-            if err := db.Set(key, value, 0); err != nil {
-                b.Fatal(err)
-            }
+            require.NoError(b, db.Set(key, value, 0))
         }
     })
 }

 func Benchmark_Delete(b *testing.B) {
     // ...
     b.RunParallel(func(pb *testing.PB) {
         for pb.Next() {
-            if err := db.Delete(key); err != nil {
-                b.Fatal(err)
-            }
+            require.NoError(b, db.Delete(key))
         }
     })
 }

@SadikSunbul SadikSunbul requested a review from gaby February 5, 2025 07:39
@SadikSunbul
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Overall looks good, just small things here and there

Is there anything else, @gaby ?

@ReneWerner87
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lets wait for one more review and then we merge
thx for the effort

@gaby
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gaby commented Feb 18, 2025

@SadikSunbul Will re-review today. Thanks!

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Actionable comments posted: 0

🧹 Nitpick comments (4)
leveldb/README.md (4)

6-11: Badge and Metadata Presentation.
The badges are clearly presented with links for release, Discord, tests, security, and linter status. As a nitpick, consider verifying that the URLs and the badge styles (which include several exclamation marks) meet your branding guidelines—this is optional if the current style is intentional.

🧰 Tools
🪛 LanguageTool

[style] ~6-~6: Using many exclamation marks might seem excessive (in this case: 3 exclamation marks for a text that’s 984 characters long)
Context: .../v/tag/gofiber/storage?filter=leveldb*) Discord Test ![Security](https://img.shields.io/github...

(EN_EXCESSIVE_EXCLAMATION)


34-47: Installation Instructions.
The installation steps are clear and concise. Consider explicitly mentioning the minimal required Go version (for example, "Requires Go 1.21 or later") rather than "the 2 last Go versions" to remove any ambiguity for the users.


70-149: Config Struct Documentation.
The Config struct is comprehensively documented with clear comments on each field. To further enhance clarity, consider including the explicit default values in the inline comments next to each field. This can help users immediately recognize what default settings they can expect.

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73-147: Markdown Formatting – Hard Tabs.
Static analysis indicates multiple instances where hard tabs are used (e.g., in the code blocks for the Config and ConfigDefault sections). To adhere to markdownlint (MD010) guidelines and ensure consistent formatting across environments, consider replacing hard tabs with spaces.

Also applies to: 153-175

🧰 Tools
🪛 markdownlint-cli2 (0.17.2)

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  • leveldb/README.md (1 hunks)
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leveldb/README.md

[style] ~6-~6: Using many exclamation marks might seem excessive (in this case: 3 exclamation marks for a text that’s 984 characters long)
Context: .../v/tag/gofiber/storage?filter=leveldb*) Discord Test ![Security](https://img.shields.io/github...

(EN_EXCESSIVE_EXCLAMATION)

🪛 markdownlint-cli2 (0.17.2)
leveldb/README.md

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🔇 Additional comments (5)
leveldb/README.md (5)

1-4: YAML Header is well-defined.
The metadata section (lines 1–4) is clear and correctly formatted, providing a proper identifier and title for the document.


14-21: Table of Contents Clarity.
The Table of Contents is well structured and aids navigation through the README.


22-33: Method Signatures Section.
The “Signatures” section clearly lists the public methods (i.e. New, Get, Set, Delete, Reset, Close, Conn) for the LevelDB storage interface. It might be helpful to add a brief description for each signature in the future, but as-is it adequately documents the API surface.


48-69: Usage Examples.
The examples demonstrate both default and custom configuration usage effectively. These practical code snippets will help users quickly understand how to integrate the LevelDB storage.

🧰 Tools
🪛 markdownlint-cli2 (0.17.2)

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150-176: Default Config Layout.
The default configuration (ConfigDefault) is well-structured and the inline comments effectively clarify the purpose of each default value. The platform-specific determination for MaxOpenFiles via an immediate function call is both concise and clear.

🧰 Tools
🪛 markdownlint-cli2 (0.17.2)

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Actionable comments posted: 1

🧹 Nitpick comments (1)
leveldb/README.md (1)

63-173: Formatting: Replace Hard Tabs with Spaces.
Static analysis identified multiple hard tab characters (e.g., in the Config and Default Config code blocks). Converting these to spaces will help comply with Markdown linting rules (MD010) and maintain consistency.

🧰 Tools
🪛 markdownlint-cli2 (0.17.2)

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📒 Files selected for processing (1)
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🧰 Additional context used
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leveldb/README.md

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🔇 Additional comments (8)
leveldb/README.md (8)

1-5: Metadata Block Structure Looks Good.
The metadata header with the document ID and title is well-formatted and clear.


6-10: Badges Section Reviewed.
The badges are correctly implemented to display relevant release, Discord, test, and linter status information.


13-20: Table of Contents is Comprehensive.
The Table of Contents provided effectively organizes the document into logical sections, aiding easy navigation.


21-31: Signatures Section is Clear and Complete.
All public functions and methods are documented with clear signatures. This will help users know what interfaces are available.


33-42: Optional Enhancement: Specify Minimum Go Version (Duplicate).
Although the installation instructions mention that LevelDB is tested on the last two Go versions, consider explicitly stating the minimum required Go version (e.g., Go 1.21 or later) for additional clarity.


47-67: Examples Section Provides Practical Usage Demos.
The examples clearly demonstrate how to initialize storage with both default and custom configurations.

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69-147: Config Struct is Well Documented.
The Config struct’s fields are thoroughly commented with default value indications and usage details. This level of documentation is very helpful for developers.

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150-173: Default Config is Correctly Defined.
The default configuration values are set clearly, including the dynamic MaxOpenFiles logic based on the operating system.

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Actionable comments posted: 1

🧹 Nitpick comments (2)
leveldb/README.md (2)

1-175: Markdown Formatting: Replace Hard Tabs with Spaces.
Multiple lines in this file are indented using hard tabs, which violates markdownlint (MD010). Please convert these hard tabs to spaces to improve consistency and adhere to the project’s style guidelines.

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1-175: Reminder: Update the Repository's Root README.
As per the PR objectives, ensure that the new LevelDB storage implementation is also mentioned in the top-level README of the repository. This update will help users quickly discover all available storage drivers.

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leveldb/README.md

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🔇 Additional comments (8)
leveldb/README.md (8)

1-4: YAML Front Matter Looks Good.
The YAML front matter correctly sets the document ID and title, establishing a proper context for the LevelDB documentation.


6-9: Effective Use of Status Badges.
The badges for release, Discord, tests, and linter provide immediate insights into the project’s current state. They are well integrated and informative.


11-12: Clear Introductory Statement.
The one-line description succinctly introduces LevelDB as a fast key-value DB powered by the syndtr/goleveldb package.


13-20: Well-Structured Table of Contents.
The table of contents offers easy navigation to key sections (Signatures, Installation, Examples, Config, and Default Config), enhancing the document’s usability.


21-32: Comprehensive API Signatures Documentation.
The “Signatures” section clearly lists the public methods available for LevelDB storage. Make sure these declarations stay in sync with the implementation in leveldb/leveldb.go.


33-46: Clear Installation Instructions.
The installation steps, including module initialization and package retrieval via go get, are straightforward and should be easy for users to follow.


47-67: Helpful Examples Section.
The examples illustrate how to import the package and instantiate the storage with both default and custom configurations. This practical guidance will help users get started quickly.

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🪛 markdownlint-cli2 (0.17.2)

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68-147: Detailed Config Struct Documentation.
The Config struct is thoroughly documented with comments explaining each field and their default values. This clarity is valuable for developers who might need to customize these settings.

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🧹 Nitpick comments (1)
leveldb/README.md (1)

6-174: Formatting & Markdown Style (Hard Tabs):
Multiple lines in the file are reported to contain hard tabs (as flagged by markdownlint MD010). Consider converting these hard tabs to spaces to align with common markdown style guidelines and eliminate lint warnings.

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leveldb/README.md

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🔇 Additional comments (10)
leveldb/README.md (10)

1-5: Front Matter & Metadata:
The front matter (lines 1–5) correctly declares the file’s metadata with an appropriate ID and title.


6-10: Badge and Status Images:
The badges for Release, Discord, Tests, and Linter are well integrated. Ensure that the test badge URL (line 8) points to the new LevelDB test workflow if applicable.


11-12: Overview Description:
The brief description clearly identifies LevelDB as a fast key-value database based on syndtr/goleveldb.


13-20: Table of Contents:
The Table of Contents is well-structured and provides clear navigation to the main sections of the document.


21-32: API Signatures Documentation:
The “Signatures” section concisely lists the public methods and function signature for the LevelDB storage API. This documentation meets the PR objectives.


33-40: Installation Instructions:
The instructions guide users through initializing a Go module (lines 37–39) and set the stage for installing the LevelDB implementation. Clear and straight to the point.


41-46: Installation - Fetching the Package:
The “go get” command in the Installation section (lines 43–45) correctly instructs users on how to install the package.


47-67: Examples Section:
The Examples are clear and demonstrate both default (line 59) and custom (lines 62–65) initialization scenarios. A minor note: verify that the use of GCInterval: 10 * time.Second matches the expected operational configuration.

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68-148: Configuration Struct Documentation:
The “Config” section provides a comprehensive struct (lines 71–147) complete with field descriptions and default indicators. The use of the Path field is consistent with the latest corrections from previous reviews.

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149-175: Default Configuration Settings:
The “Default Config” section (lines 152–174) initializes the default settings appropriately. The conditional logic for MaxOpenFiles (lines 160–165) based on the OS is both clever and clear.

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👍 LGTM

@ReneWerner87 ReneWerner87 merged commit 6b31862 into gofiber:main Mar 3, 2025
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