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log.go
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log.go
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package log
import (
"fmt"
"io"
"os"
"path"
"path/filepath"
"runtime"
"strconv"
"strings"
"sync"
"time"
)
const logChanBufferSize = 2048
const projectFolder = "cubit"
var exitHandler = func() { os.Exit(-1) }
// Level represents log level type.
type Level int
const (
// DebugLevel represents DEBUG log level.
DebugLevel Level = iota
// InfoLevel represents INFO log level.
InfoLevel
// WarningLevel represents WARNING log level.
WarningLevel
// ErrorLevel represents ERROR log level.
ErrorLevel
// FatalLevel represents FATAL log level.
FatalLevel
// OffLevel represents a disabledLogger log level.
OffLevel
)
// Logger represents a common logger interface.
type Logger interface {
io.Closer
Level() Level
Log(level Level, pkg string, file string, line int, format string, args ...interface{})
}
// Debugf writes a 'debug' message to configured logger.
func Debugf(format string, args ...interface{}) {
if inst := instance(); inst.Level() <= DebugLevel {
ci := getCallerInfo()
inst.Log(DebugLevel, ci.pkg, ci.filename, ci.line, format, args...)
}
}
// Infof writes a 'info' message to configured logger.
func Infof(format string, args ...interface{}) {
if inst := instance(); inst.Level() <= InfoLevel {
ci := getCallerInfo()
inst.Log(InfoLevel, ci.pkg, ci.filename, ci.line, format, args...)
}
}
// Warnf writes a 'warning' message to configured logger.
func Warnf(format string, args ...interface{}) {
if inst := instance(); inst.Level() <= WarningLevel {
ci := getCallerInfo()
inst.Log(WarningLevel, ci.pkg, ci.filename, ci.line, format, args...)
}
}
// Errorf writes a 'error' message to configured logger.
func Errorf(format string, args ...interface{}) {
if inst := instance(); inst.Level() <= ErrorLevel {
ci := getCallerInfo()
inst.Log(ErrorLevel, ci.pkg, ci.filename, ci.line, format, args...)
}
}
// Fatalf writes a 'fatal' message to configured logger.
func Fatalf(format string, args ...interface{}) {
if inst := instance(); inst.Level() <= FatalLevel {
ci := getCallerInfo()
inst.Log(FatalLevel, ci.pkg, ci.filename, ci.line, format, args...)
}
}
// Error writes an error value to configured logger.
func Error(err error) {
if inst := instance(); inst.Level() <= ErrorLevel {
ci := getCallerInfo()
inst.Log(ErrorLevel, ci.pkg, ci.filename, ci.line, "%v", err)
}
}
// Fatal writes an error value to configured logger.
// Application should terminate after logging.
func Fatal(err error) {
if inst := instance(); inst.Level() <= FatalLevel {
ci := getCallerInfo()
inst.Log(FatalLevel, ci.pkg, ci.filename, ci.line, "%v", err)
}
}
var (
instMu sync.RWMutex
inst Logger
)
// Disabled stores a disabled logger instance.
var Disabled Logger = &disabledLogger{}
func init() {
inst = Disabled
}
// Set sets the global logger.
func Set(logger Logger) {
instMu.Lock()
_ = inst.Close()
inst = logger
instMu.Unlock()
}
// Unset disable a previously set global logger.
func Unset() {
Set(Disabled)
}
func instance() Logger {
instMu.RLock()
l := inst
instMu.RUnlock()
return l
}
type callerInfo struct {
pkg string
filename string
line int
}
type record struct {
level Level
pkg string
file string
line int
log string
continuCh chan struct{}
}
type logger struct {
level Level
output io.Writer
files []io.WriteCloser
b strings.Builder
recCh chan record
}
// New returns a default logger instance.
func New(level string, output io.Writer, files ...io.WriteCloser) (Logger, error) {
lvl, err := levelFromString(level)
if err != nil {
return nil, err
}
l := &logger{
level: lvl,
output: output,
files: files,
recCh: make(chan record, logChanBufferSize),
}
go l.loop()
return l, nil
}
func (l *logger) Level() Level {
return l.level
}
func (l *logger) Log(level Level, pkg string, file string, line int, format string, args ...interface{}) {
entry := record{
level: level,
pkg: pkg,
file: file,
line: line,
log: fmt.Sprintf(format, args...),
continuCh: make(chan struct{}),
}
select {
case l.recCh <- entry:
if level == FatalLevel {
<-entry.continuCh // wait until done
}
default:
break // avoid blocking...
}
}
func (l *logger) Close() error {
close(l.recCh)
return nil
}
func (l *logger) loop() {
for {
select {
case rec, ok := <-l.recCh:
if !ok {
// close log files
for _, w := range l.files {
_ = w.Close()
}
return
}
l.b.Reset()
l.b.WriteString(time.Now().Format("2006-01-02 15:04:05"))
l.b.WriteString(" ")
l.b.WriteString(logLevelGlyph(rec.level))
l.b.WriteString(" [")
l.b.WriteString(logLevelAbbreviation(rec.level))
l.b.WriteString("] ")
l.b.WriteString(rec.pkg)
if len(rec.pkg) > 0 {
l.b.WriteString("/")
}
l.b.WriteString(rec.file)
l.b.WriteString(":")
l.b.WriteString(strconv.Itoa(rec.line))
l.b.WriteString(" - ")
l.b.WriteString(rec.log)
l.b.WriteString("\n")
line := l.b.String()
_, _ = fmt.Fprintf(l.output, line)
for _, w := range l.files {
_, _ = fmt.Fprintf(w, line)
}
if rec.level == FatalLevel {
exitHandler()
}
close(rec.continuCh)
}
}
}
func getCallerInfo() callerInfo {
ci := callerInfo{}
_, file, ln, ok := runtime.Caller(2)
if ok {
ci.pkg = filepath.Base(path.Dir(file))
if ci.pkg == projectFolder {
ci.pkg = ""
}
filename := filepath.Base(file)
ci.filename = strings.TrimSuffix(filename, filepath.Ext(filename))
ci.line = ln
} else {
ci.pkg = "???"
ci.filename = "???"
}
return ci
}
func logLevelAbbreviation(level Level) string {
switch level {
case DebugLevel:
return "DBG"
case InfoLevel:
return "INF"
case WarningLevel:
return "WRN"
case ErrorLevel:
return "ERR"
case FatalLevel:
return "FTL"
default:
return ""
}
}
func logLevelGlyph(level Level) string {
switch level {
case DebugLevel:
return "\U0001f50d"
case InfoLevel:
return "\u2139\ufe0f"
case WarningLevel:
return "\u26a0\ufe0f"
case ErrorLevel:
return "\U0001f4a5"
case FatalLevel:
return "\U0001f480"
default:
return ""
}
}
func levelFromString(level string) (Level, error) {
switch strings.ToLower(level) {
case "debug":
return DebugLevel, nil
case "", "info":
return InfoLevel, nil
case "warning":
return WarningLevel, nil
case "error":
return ErrorLevel, nil
case "fatal":
return FatalLevel, nil
case "off":
return OffLevel, nil
}
return Level(-1), fmt.Errorf("log: unrecognized level: %s", level)
}