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// Package logger offers simple logging
package logger
import (
"fmt"
"io"
"log"
"os"
"runtime/debug"
"sync"
)
type severity int
type logger interface {
Output(calldepth int, s string) error
SetOutput(w io.Writer)
SetFlags(flag int)
}
// Severity levels.
const (
sInfo severity = iota
sWarning
sError
sFatal
)
// Severity tags.
const (
tagInfo = "\033[0m[INFO] "
tagWarning = "\033[33m[WARN] "
tagError = "\033[31m[ERROR] "
tagFatal = "\033[1;31m[FATAL] "
)
const (
flags = log.Lmsgprefix | log.Ltime
)
var (
logLock sync.Mutex
defaultLogger *Logger
)
// initialize resets defaultLogger. Which allows tests to reset environment.
func initialize() {
defaultLogger = &Logger{
loggers: [4]logger{
log.New(os.Stderr, tagInfo, flags),
log.New(os.Stderr, tagWarning, flags),
log.New(os.Stderr, tagError, flags),
log.New(os.Stderr, tagFatal, flags),
},
minSeverity: 0,
}
}
func init() {
initialize()
}
// Init sets up logging and should be called before log functions, usually in
// the caller's main(). Default log functions can be called before Init(), but
// every severity will be logged.
// The first call to Init populates the default logger and returns the
// generated logger, subsequent calls to Init will only return the generated
// logger.
func Init(level int) *Logger {
l := Logger{
loggers: [4]logger{
log.New(os.Stderr, tagInfo, flags),
log.New(os.Stderr, tagWarning, flags),
log.New(os.Stderr, tagError, flags),
log.New(os.Stderr, tagFatal, flags),
},
minSeverity: sFatal - severity(level),
initialized: true,
}
logLock.Lock()
defer logLock.Unlock()
if !defaultLogger.initialized {
defaultLogger = &l
}
return &l
}
// A Logger represents an active logging object. Multiple loggers can be used
// simultaneously even if they are using the same writers.
type Logger struct {
loggers [4]logger
minSeverity severity
initialized bool
}
func (l *Logger) output(s severity, depth int, txt string) {
if s < l.minSeverity {
return
}
logLock.Lock()
defer logLock.Unlock()
if int(s) >= len(l.loggers) {
panic(fmt.Sprintln("unrecognized severity:", s))
}
l.loggers[s].Output(3+depth, txt+"\033[0m")
}
// SetOutput changes the output of the logger.
func (l *Logger) SetOutput(w io.Writer) {
for _, logger := range l.loggers {
logger.SetOutput(w)
}
}
// SetFlags sets the output flags for the logger.
func (l *Logger) SetFlags(flag int) {
for _, logger := range l.loggers {
logger.SetFlags(flag)
}
}
// Info logs with the Info severity.
// Arguments are handled in the manner of fmt.Print.
func (l *Logger) Info(v ...interface{}) {
l.output(sInfo, 0, fmt.Sprint(v...))
}
// Infof logs with the Info severity.
// Arguments are handled in the manner of fmt.Printf.
func (l *Logger) Infof(format string, v ...interface{}) {
l.output(sInfo, 0, fmt.Sprintf(format, v...))
}
// Warning logs with the Warning severity.
// Arguments are handled in the manner of fmt.Print.
func (l *Logger) Warning(v ...interface{}) {
l.output(sWarning, 0, fmt.Sprint(v...))
}
// Warningf logs with the Warning severity.
// Arguments are handled in the manner of fmt.Printf.
func (l *Logger) Warningf(format string, v ...interface{}) {
l.output(sWarning, 0, fmt.Sprintf(format, v...))
}
// Error logs with the ERROR severity.
// Arguments are handled in the manner of fmt.Print.
func (l *Logger) Error(v ...interface{}) {
l.output(sError, 0, fmt.Sprint(v...))
}
// Errorf logs with the Error severity.
// Arguments are handled in the manner of fmt.Printf.
func (l *Logger) Errorf(format string, v ...interface{}) {
l.output(sError, 0, fmt.Sprintf(format, v...))
}
// Panic uses the default logger and logs with the Error severity.
// Arguments are handled in the manner of fmt.Print.
func (l *Logger) Panic(v ...interface{}) {
s := fmt.Sprint(v...)
l.output(sError, 0, s)
panic(s)
}
// Panicf uses the default logger and logs with the Error severity.
// Arguments are handled in the manner of fmt.Printf.
func (l *Logger) Panicf(format string, v ...interface{}) {
s := fmt.Sprintf(format, v...)
l.output(sError, 0, s)
panic(s)
}
// Fatal logs with the Fatal severity, and ends with os.Exit(1).
// Arguments are handled in the manner of fmt.Print.
func (l *Logger) Fatal(v ...interface{}) {
l.output(sFatal, 0, fmt.Sprint(v...))
debug.PrintStack()
os.Exit(1)
}
// Fatalf logs with the Fatal severity, and ends with os.Exit(1).
// Arguments are handled in the manner of fmt.Printf.
func (l *Logger) Fatalf(format string, v ...interface{}) {
l.output(sFatal, 0, fmt.Sprintf(format, v...))
debug.PrintStack()
os.Exit(1)
}
// SetOutput changes the output of the default logger.
func SetOutput(w io.Writer) {
defaultLogger.SetOutput(w)
}
// SetFlags sets the output flags for the logger.
func SetFlags(flag int) {
defaultLogger.SetFlags(flag)
}
// Info uses the default logger and logs with the Info severity.
// Arguments are handled in the manner of fmt.Print.
func Info(v ...interface{}) {
defaultLogger.output(sInfo, 0, fmt.Sprint(v...))
}
// Infof uses the default logger and logs with the Info severity.
// Arguments are handled in the manner of fmt.Printf.
func Infof(format string, v ...interface{}) {
defaultLogger.output(sInfo, 0, fmt.Sprintf(format, v...))
}
// Warning uses the default logger and logs with the Warning severity.
// Arguments are handled in the manner of fmt.Print.
func Warning(v ...interface{}) {
defaultLogger.output(sWarning, 0, fmt.Sprint(v...))
}
// Warningf uses the default logger and logs with the Warning severity.
// Arguments are handled in the manner of fmt.Printf.
func Warningf(format string, v ...interface{}) {
defaultLogger.output(sWarning, 0, fmt.Sprintf(format, v...))
}
// Error uses the default logger and logs with the Error severity.
// Arguments are handled in the manner of fmt.Print.
func Error(v ...interface{}) {
defaultLogger.output(sError, 0, fmt.Sprint(v...))
}
// Errorf uses the default logger and logs with the Error severity.
// Arguments are handled in the manner of fmt.Printf.
func Errorf(format string, v ...interface{}) {
defaultLogger.output(sError, 0, fmt.Sprintf(format, v...))
}
// Panic uses the default logger and logs with the Error severity.
// Arguments are handled in the manner of fmt.Print.
func Panic(v ...interface{}) {
s := fmt.Sprint(v...)
defaultLogger.output(sError, 0, s)
panic(s)
}
// Panicf uses the default logger and logs with the Error severity.
// Arguments are handled in the manner of fmt.Printf.
func Panicf(format string, v ...interface{}) {
s := fmt.Sprintf(format, v...)
defaultLogger.output(sError, 0, s)
panic(s)
}
// Fatal uses the default logger, logs with the Fatal severity,
// and ends with os.Exit(1).
// Arguments are handled in the manner of fmt.Print.
func Fatal(v ...interface{}) {
defaultLogger.output(sFatal, 0, fmt.Sprint(v...))
debug.PrintStack()
os.Exit(1)
}
// Fatalf uses the default logger, logs with the Fatal severity,
// and ends with os.Exit(1).
// Arguments are handled in the manner of fmt.Printf.
func Fatalf(format string, v ...interface{}) {
defaultLogger.output(sFatal, 0, fmt.Sprintf(format, v...))
debug.PrintStack()
os.Exit(1)
}
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