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log.go
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log.go
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// Copyright 2020 Kentaro Hibino. All rights reserved.
// Use of this source code is governed by a MIT license
// that can be found in the LICENSE file.
// Package log exports logging related types and functions.
package log
import (
"fmt"
"io"
stdlog "log"
"os"
"sync"
)
// Base supports logging at various log levels.
type Base interface {
// Debug logs a message at Debug level.
Debug(args ...interface{})
// Info logs a message at Info level.
Info(args ...interface{})
// Warn logs a message at Warning level.
Warn(args ...interface{})
// Error logs a message at Error level.
Error(args ...interface{})
// Fatal logs a message at Fatal level
// and process will exit with status set to 1.
Fatal(args ...interface{})
}
// baseLogger is a wrapper object around log.Logger from the standard library.
// It supports logging at various log levels.
type baseLogger struct {
*stdlog.Logger
}
// Debug logs a message at Debug level.
func (l *baseLogger) Debug(args ...interface{}) {
l.prefixPrint("DEBUG: ", args...)
}
// Info logs a message at Info level.
func (l *baseLogger) Info(args ...interface{}) {
l.prefixPrint("INFO: ", args...)
}
// Warn logs a message at Warning level.
func (l *baseLogger) Warn(args ...interface{}) {
l.prefixPrint("WARN: ", args...)
}
// Error logs a message at Error level.
func (l *baseLogger) Error(args ...interface{}) {
l.prefixPrint("ERROR: ", args...)
}
// Fatal logs a message at Fatal level
// and process will exit with status set to 1.
func (l *baseLogger) Fatal(args ...interface{}) {
l.prefixPrint("FATAL: ", args...)
os.Exit(1)
}
func (l *baseLogger) prefixPrint(prefix string, args ...interface{}) {
args = append([]interface{}{prefix}, args...)
l.Print(args...)
}
// newBase creates and returns a new instance of baseLogger.
func newBase(out io.Writer) *baseLogger {
prefix := fmt.Sprintf("asynq: pid=%d ", os.Getpid())
return &baseLogger{
stdlog.New(out, prefix, stdlog.Ldate|stdlog.Ltime|stdlog.Lmicroseconds|stdlog.LUTC),
}
}
// NewLogger creates and returns a new instance of Logger.
// Log level is set to DebugLevel by default.
func NewLogger(base Base) *Logger {
if base == nil {
base = newBase(os.Stderr)
}
return &Logger{base: base, level: DebugLevel}
}
// Logger logs message to io.Writer at various log levels.
type Logger struct {
base Base
mu sync.Mutex
// Minimum log level for this logger.
// Message with level lower than this level won't be outputted.
level Level
}
// Level represents a log level.
type Level int32
const (
// DebugLevel is the lowest level of logging.
// Debug logs are intended for debugging and development purposes.
DebugLevel Level = iota
// InfoLevel is used for general informational log messages.
InfoLevel
// WarnLevel is used for undesired but relatively expected events,
// which may indicate a problem.
WarnLevel
// ErrorLevel is used for undesired and unexpected events that
// the program can recover from.
ErrorLevel
// FatalLevel is used for undesired and unexpected events that
// the program cannot recover from.
FatalLevel
)
// String is part of the fmt.Stringer interface.
//
// Used for testing and debugging purposes.
func (l Level) String() string {
switch l {
case DebugLevel:
return "debug"
case InfoLevel:
return "info"
case WarnLevel:
return "warning"
case ErrorLevel:
return "error"
case FatalLevel:
return "fatal"
default:
return "unknown"
}
}
// canLogAt reports whether logger can log at level v.
func (l *Logger) canLogAt(v Level) bool {
l.mu.Lock()
defer l.mu.Unlock()
return v >= l.level
}
func (l *Logger) Debug(args ...interface{}) {
if !l.canLogAt(DebugLevel) {
return
}
l.base.Debug(args...)
}
func (l *Logger) Info(args ...interface{}) {
if !l.canLogAt(InfoLevel) {
return
}
l.base.Info(args...)
}
func (l *Logger) Warn(args ...interface{}) {
if !l.canLogAt(WarnLevel) {
return
}
l.base.Warn(args...)
}
func (l *Logger) Error(args ...interface{}) {
if !l.canLogAt(ErrorLevel) {
return
}
l.base.Error(args...)
}
func (l *Logger) Fatal(args ...interface{}) {
if !l.canLogAt(FatalLevel) {
return
}
l.base.Fatal(args...)
}
func (l *Logger) Debugf(format string, args ...interface{}) {
l.Debug(fmt.Sprintf(format, args...))
}
func (l *Logger) Infof(format string, args ...interface{}) {
l.Info(fmt.Sprintf(format, args...))
}
func (l *Logger) Warnf(format string, args ...interface{}) {
l.Warn(fmt.Sprintf(format, args...))
}
func (l *Logger) Errorf(format string, args ...interface{}) {
l.Error(fmt.Sprintf(format, args...))
}
func (l *Logger) Fatalf(format string, args ...interface{}) {
l.Fatal(fmt.Sprintf(format, args...))
}
// SetLevel sets the logger level.
// It panics if v is less than DebugLevel or greater than FatalLevel.
func (l *Logger) SetLevel(v Level) {
l.mu.Lock()
defer l.mu.Unlock()
if v < DebugLevel || v > FatalLevel {
panic("log: invalid log level")
}
l.level = v
}