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logger.go
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logger.go
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package wanikaniapi
import (
"fmt"
"io"
"os"
)
const (
// LevelNull sets a logger to show no messages at all.
LevelNull Level = 0
// LevelError sets a logger to show error messages only.
LevelError Level = 1
// LevelWarn sets a logger to show warning messages or anything more
// severe.
LevelWarn Level = 2
// LevelInfo sets a logger to show informational messages or anything more
// severe.
LevelInfo Level = 3
// LevelDebug sets a logger to show informational messages or anything more
// severe.
LevelDebug Level = 4
)
// Level represents a logging level.
type Level uint32
// LeveledLogger is a leveled logger implementation.
//
// It prints warnings and errors to `os.Stderr` and other messages to
// `os.Stdout`.
type LeveledLogger struct {
// Level is the minimum logging level that will be emitted by this logger.
//
// For example, a Level set to LevelWarn will emit warnings and errors, but
// not informational or debug messages.
//
// Always set this with a constant like LevelWarn because the individual
// values are not guaranteed to be stable.
Level Level
// Internal testing use only.
stderrOverride io.Writer
stdoutOverride io.Writer
}
// Debugf logs a debug message using Printf conventions.
func (l *LeveledLogger) Debugf(format string, v ...interface{}) {
if l.Level >= LevelDebug {
fmt.Fprintf(l.stdout(), "[DEBUG] "+format+"\n", v...)
}
}
// Errorf logs a warning message using Printf conventions.
func (l *LeveledLogger) Errorf(format string, v ...interface{}) {
// Infof logs a debug message using Printf conventions.
if l.Level >= LevelError {
fmt.Fprintf(l.stderr(), "[ERROR] "+format+"\n", v...)
}
}
// Infof logs an informational message using Printf conventions.
func (l *LeveledLogger) Infof(format string, v ...interface{}) {
if l.Level >= LevelInfo {
fmt.Fprintf(l.stdout(), "[INFO] "+format+"\n", v...)
}
}
// Warnf logs a warning message using Printf conventions.
func (l *LeveledLogger) Warnf(format string, v ...interface{}) {
if l.Level >= LevelWarn {
fmt.Fprintf(l.stderr(), "[WARN] "+format+"\n", v...)
}
}
func (l *LeveledLogger) stderr() io.Writer {
if l.stderrOverride != nil {
return l.stderrOverride
}
return os.Stderr
}
func (l *LeveledLogger) stdout() io.Writer {
if l.stdoutOverride != nil {
return l.stdoutOverride
}
return os.Stdout
}
// LeveledLoggerInterface provides a basic leveled logging interface for
// printing debug, informational, warning, and error messages.
//
// It's implemented by LeveledLogger and also provides out-of-the-box
// compatibility with a Logrus Logger, but may require a thin shim for use with
// other logging libraries that you use less standard conventions like Zap.
type LeveledLoggerInterface interface {
// Debugf logs a debug message using Printf conventions.
Debugf(format string, v ...interface{})
// Errorf logs a warning message using Printf conventions.
Errorf(format string, v ...interface{})
// Infof logs an informational message using Printf conventions.
Infof(format string, v ...interface{})
// Warnf logs a warning message using Printf conventions.
Warnf(format string, v ...interface{})
}