fix: create RandomGenerator interface and struct for testing purpose #181

service/random_generator.go

@@ -0,0 +1,48 @@
+package service
+
+import (
+	"me-fit/types"
+
+	"crypto/rand"
+	"encoding/base64"
+	"log/slog"
+
+	"github.com/google/uuid"
+)
+
+type RandomGenerator interface {
+	Bytes(size int) ([]byte, error)
+	String(size int) (string, error)
+	UUID() (uuid.UUID, error)
+}
+
+type RandomGeneratorImpl struct {
+}
+
+func NewRandomGeneratorImpl() *RandomGeneratorImpl {
+	return &RandomGeneratorImpl{}
+}
+
+func (r *RandomGeneratorImpl) Bytes(size int) ([]byte, error) {
+	b := make([]byte, 32)
+	_, err := rand.Read(b)
+	if err != nil {
+		slog.Error("Error generating random bytes: " + err.Error())
+		return []byte{}, types.ErrInternal
+	}
+
+	return b, nil
+}
+
+func (r *RandomGeneratorImpl) String(size int) (string, error) {
+	bytes, err := r.Bytes(size)
+	if err != nil {
+		return "", types.ErrInternal
+	}
+
+	return base64.StdEncoding.EncodeToString(bytes), nil
+}
+
+func (r *RandomGeneratorImpl) UUID() (uuid.UUID, error) {
+	return uuid.NewRandom()
+}