Fix all golangci-lint warnings

.github/workflows/go.yml

@@ -10,6 +10,27 @@ on:
 
 jobs:
 
+  lint:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        # We make use of the `slices` feature, only available in 1.21 and newer
+        go-version: [ '1.21', '1.22' ]
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Set up Go
+      uses: actions/setup-go@v5
+      with:
+        go-version: ${{ matrix.go-version }}
+
+    - name: Lint
+      uses: golangci/golangci-lint-action@v6
+      with:
+        version: v1.56.2
+        args: --verbose
+
   build:
     runs-on: ubuntu-latest
     strategy:

collection_test.go

@@ -604,7 +604,10 @@ func benchmarkCollection_Query(b *testing.B, n int, withContent bool) {
 			// Let's say we embed 500 tokens, that's ~375 words, ~1875 characters
 			doc.Content = randomString(r, 1875)
 		}
-		c.AddDocument(ctx, doc)
+
+		if err := c.AddDocument(ctx, doc); err != nil {
+			b.Fatal("expected nil, got", err)
+		}
 	}
 
 	b.ResetTimer()

db_test.go

@@ -394,7 +394,9 @@ func TestDB_DeleteCollection(t *testing.T) {
 	}
 
 	// Delete collection
-	db.DeleteCollection(name)
+	if err := db.DeleteCollection(name); err != nil {
+		t.Fatal("expected no error, got", err)
+	}
 
 	// Check expectations
 	// We don't have access to the documents field, but we can rely on DB.ListCollections()
@@ -426,7 +428,9 @@ func TestDB_Reset(t *testing.T) {
 	}
 
 	// Reset DB
-	db.Reset()
+	if err := db.Reset(); err != nil {
+		t.Fatal("expected no error, got", err)
+	}
 
 	// Check expectations
 	// We don't have access to the documents field, but we can rely on DB.ListCollections()

persistence_test.go

@@ -28,7 +28,9 @@ func TestPersistenceWrite(t *testing.T) {
 
 	t.Run("gob", func(t *testing.T) {
 		tempFilePath := tempDir + ".gob"
-		persistToFile(tempFilePath, obj, false, "")
+		if err := persistToFile(tempFilePath, obj, false, ""); err != nil {
+			t.Fatal("expected nil, got", err)
+		}
 
 		// Check if the file exists.
 		_, err = os.Stat(tempFilePath)
@@ -57,7 +59,9 @@ func TestPersistenceWrite(t *testing.T) {
 
 	t.Run("gob gzipped", func(t *testing.T) {
 		tempFilePath := tempDir + ".gob.gz"
-		persistToFile(tempFilePath, obj, true, "")
+		if err := persistToFile(tempFilePath, obj, true, ""); err != nil {
+			t.Fatal("expected nil, got", err)
+		}
 
 		// Check if the file exists.
 		_, err = os.Stat(tempFilePath)

vector.go

@@ -2,35 +2,11 @@ package chromem
 
 import (
 	"errors"
-	"fmt"
 	"math"
 )
 
 const isNormalizedPrecisionTolerance = 1e-6
 
-// cosineSimilarity calculates the cosine similarity between two vectors.
-// Vectors are normalized first.
-// The resulting value represents the similarity, so a higher value means the
-// vectors are more similar.
-func cosineSimilarity(a, b []float32) (float32, error) {
-	// The vectors must have the same length
-	if len(a) != len(b) {
-		return 0, errors.New("vectors must have the same length")
-	}
-
-	if !isNormalized(a) || !isNormalized(b) {
-		a, b = normalizeVector(a), normalizeVector(b)
-	}
-	dotProduct, err := dotProduct(a, b)
-	if err != nil {
-		return 0, fmt.Errorf("couldn't calculate dot product: %w", err)
-	}
-
-	// Vectors are already normalized, so no need to divide by magnitudes
-
-	return dotProduct, nil
-}
-
 // dotProduct calculates the dot product between two vectors.
 // It's the same as cosine similarity for normalized vectors.
 // The resulting value represents the similarity, so a higher value means the