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package log
import (
"fmt"
"strings"
)
// Level of logging
type Level int
// MarshalText marshals level to text
func (l Level) MarshalText() ([]byte, error) {
if l >= maxLevel || l < 0 {
return nil, fmt.Errorf("failed to marshal log level: level value (%d) is not in the allowed range (0-%d)", l, maxLevel-1)
}
return []byte(l.String()), nil
}
// UnmarshalText unmarshals level from text
func (l *Level) UnmarshalText(text []byte) error {
level, err := ParseLevel(string(text))
if err != nil {
return err
}
*l = level
return nil
}
// Standard log levels
const (
TraceLevel Level = iota
DebugLevel
InfoLevel
WarnLevel
ErrorLevel
FatalLevel
maxLevel
)
func Levels() (l []Level) {
for i := 0; i < int(maxLevel); i++ {
l = append(l, Level(i))
}
return
}
// String values for standard log levels
const (
TraceString = "trace"
DebugString = "debug"
InfoString = "info"
WarnString = "warn"
ErrorString = "error"
FatalString = "fatal"
)
// String implements Stringer interface for Level
func (l Level) String() string {
switch l {
case TraceLevel:
return TraceString
case DebugLevel:
return DebugString
case InfoLevel:
return InfoString
case WarnLevel:
return WarnString
case ErrorLevel:
return ErrorString
case FatalLevel:
return FatalString
default:
// For when new log level is not added to this func (most likely never).
panic(fmt.Sprintf("unknown log level: %d", l))
}
}
// Set implements flag.Value interface
func (l *Level) Set(v string) error {
lvl, err := ParseLevel(v)
if err != nil {
return err
}
*l = lvl
return nil
}
// ParseLevel parses log level from string. Returns ErrUnknownLevel for unknown log level.
func ParseLevel(l string) (Level, error) {
switch strings.ToLower(l) {
case TraceString:
return TraceLevel, nil
case DebugString:
return DebugLevel, nil
case InfoString:
return InfoLevel, nil
case WarnString:
return WarnLevel, nil
case ErrorString:
return ErrorLevel, nil
case FatalString:
return FatalLevel, nil
default:
return FatalLevel, fmt.Errorf("unknown log level: %s", l)
}
}
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