Size computation for allocation may overflow (#99)

* Size computation for allocation may overflow

Performing calculations involving the size of potentially large strings or slices can result in an overflow (for signed integer types) or a wraparound (for unsigned types). An overflow causes the result of the calculation to become negative, while a wraparound results in a small (positive) number.

vendor/github.com/redis/go-redis/v9/internal/log.go

@@ -7,20 +7,73 @@ import (
 	"os"
 )
 
+// TODO (ned): Revisit logging
+// Add more standardized approach with log levels and configurability
+
 type Logging interface {
 	Printf(ctx context.Context, format string, v ...interface{})
 }
 
-type logger struct {
+type DefaultLogger struct {
 	log *log.Logger
 }
 
-func (l *logger) Printf(ctx context.Context, format string, v ...interface{}) {
+func (l *DefaultLogger) Printf(ctx context.Context, format string, v ...interface{}) {
 	_ = l.log.Output(2, fmt.Sprintf(format, v...))
 }
 
+func NewDefaultLogger() Logging {
+	return &DefaultLogger{
+		log: log.New(os.Stderr, "redis: ", log.LstdFlags|log.Lshortfile),
+	}
+}
+
 // Logger calls Output to print to the stderr.
 // Arguments are handled in the manner of fmt.Print.
-var Logger Logging = &logger{
-	log: log.New(os.Stderr, "redis: ", log.LstdFlags|log.Lshortfile),
+var Logger Logging = NewDefaultLogger()
+
+var LogLevel LogLevelT = LogLevelError
+
+// LogLevelT represents the logging level
+type LogLevelT int
+
+// Log level constants for the entire go-redis library
+const (
+	LogLevelError LogLevelT = iota // 0 - errors only
+	LogLevelWarn                   // 1 - warnings and errors
+	LogLevelInfo                   // 2 - info, warnings, and errors
+	LogLevelDebug                  // 3 - debug, info, warnings, and errors
+)
+
+// String returns the string representation of the log level
+func (l LogLevelT) String() string {
+	switch l {
+	case LogLevelError:
+		return "ERROR"
+	case LogLevelWarn:
+		return "WARN"
+	case LogLevelInfo:
+		return "INFO"
+	case LogLevelDebug:
+		return "DEBUG"
+	default:
+		return "UNKNOWN"
+	}
+}
+
+// IsValid returns true if the log level is valid
+func (l LogLevelT) IsValid() bool {
+	return l >= LogLevelError && l <= LogLevelDebug
+}
+
+func (l LogLevelT) WarnOrAbove() bool {
+	return l >= LogLevelWarn
+}
+
+func (l LogLevelT) InfoOrAbove() bool {
+	return l >= LogLevelInfo
+}
+
+func (l LogLevelT) DebugOrAbove() bool {
+	return l >= LogLevelDebug
 }