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logger.go
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logger.go
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package logger
import (
"fmt"
"io"
"log"
"os"
"runtime/debug"
"strings"
"sync"
"time"
)
type LogLevel int
const (
LevelDebug LogLevel = iota
LevelInfo
LevelWarn
LevelError
LevelNone LogLevel = 99
legacyTimeFormat = "2006/01/02 15:04:05"
rfc3339TimeFormat = "2006-01-02T15:04:05.000000000Z"
)
var levels = map[string]LogLevel{
"DEBUG": LevelDebug,
"INFO": LevelInfo,
"WARN": LevelWarn,
"ERROR": LevelError,
"NONE": LevelNone,
}
var levelKeys = []string{"DEBUG", "INFO", "WARN", "ERROR", "NONE"}
func Levelify(levelString string) (LogLevel, error) {
upperLevelString := strings.ToUpper(levelString)
level, ok := levels[upperLevelString]
if !ok {
expected := strings.Join(levelKeys, ", ")
return level, fmt.Errorf("Unknown LogLevel string '%s', expected one of [%s]", levelString, expected)
}
return level, nil
}
func AsString(level LogLevel) string {
for k, v := range levels {
if level == v {
return k
}
}
return "DEBUG"
}
// to update cd logger && go run github.com/maxbrunsfeld/counterfeiter -generate
// counterfeiter:generate . Logger
type Logger interface {
Debug(tag, msg string, args ...interface{})
DebugWithDetails(tag, msg string, args ...interface{})
Info(tag, msg string, args ...interface{})
Warn(tag, msg string, args ...interface{})
Error(tag, msg string, args ...interface{})
ErrorWithDetails(tag, msg string, args ...interface{})
HandlePanic(tag string)
ToggleForcedDebug()
UseRFC3339Timestamps()
UseTags(tags []LogTag)
Flush() error
FlushTimeout(time.Duration) error
}
type logger struct {
level LogLevel
logger *log.Logger
forcedDebug bool
loggerMu sync.Mutex
timestampFormat string
tags []LogTag
}
type LogTag struct {
Name string `json:"name"`
LogLevel LogLevel `json:"log_level"`
}
func New(level LogLevel, out *log.Logger) Logger {
out.SetFlags(0)
return &logger{
level: level,
logger: out,
timestampFormat: legacyTimeFormat,
}
}
func NewLogger(level LogLevel) Logger {
return NewWriterLogger(level, os.Stderr)
}
func NewWriterLogger(level LogLevel, writer io.Writer) Logger {
return New(
level,
log.New(writer, "", log.LstdFlags),
)
}
func (l *logger) UseRFC3339Timestamps() {
l.timestampFormat = rfc3339TimeFormat
}
func (l *logger) UseTags(tags []LogTag) {
l.tags = tags
}
func (l *logger) Flush() error { return nil }
func (l *logger) FlushTimeout(_ time.Duration) error { return nil }
func (l *logger) Debug(tag, msg string, args ...interface{}) {
if l.getLogLevel(tag) > LevelDebug && !l.forcedDebug {
return
}
msg = "DEBUG - " + msg
l.printf(tag, msg, args...)
}
// DebugWithDetails will automatically change the format of the message
// to insert a block of text after the log
func (l *logger) DebugWithDetails(tag, msg string, args ...interface{}) {
msg = msg + "\n********************\n%s\n********************"
l.Debug(tag, msg, args...)
}
func (l *logger) Info(tag, msg string, args ...interface{}) {
if l.getLogLevel(tag) > LevelInfo && !l.forcedDebug {
return
}
msg = "INFO - " + msg
l.printf(tag, msg, args...)
}
func (l *logger) Warn(tag, msg string, args ...interface{}) {
if l.getLogLevel(tag) > LevelWarn && !l.forcedDebug {
return
}
msg = "WARN - " + msg
l.printf(tag, msg, args...)
}
func (l *logger) Error(tag, msg string, args ...interface{}) {
if l.getLogLevel(tag) > LevelError && !l.forcedDebug {
return
}
msg = "ERROR - " + msg
l.printf(tag, msg, args...)
}
// ErrorWithDetails will automatically change the format of the message
// to insert a block of text after the log
func (l *logger) ErrorWithDetails(tag, msg string, args ...interface{}) {
msg = msg + "\n********************\n%s\n********************"
l.Error(tag, msg, args...)
}
func (l *logger) recoverPanic(tag string) (didPanic bool) {
if e := recover(); e != nil {
var msg string
switch obj := e.(type) {
case string:
msg = obj
case fmt.Stringer:
msg = obj.String()
case error:
msg = obj.Error()
default:
msg = fmt.Sprintf("%#v", obj)
}
l.ErrorWithDetails(tag, "Panic: %s", msg, debug.Stack())
return true
}
return false
}
func (l *logger) HandlePanic(tag string) {
if l.recoverPanic(tag) {
os.Exit(2)
}
}
func (l *logger) ToggleForcedDebug() {
l.forcedDebug = !l.forcedDebug
}
func (l *logger) printf(tag, msg string, args ...interface{}) {
s := fmt.Sprintf(msg, args...)
l.loggerMu.Lock()
timestamp := time.Now().Format(l.timestampFormat)
l.logger.SetPrefix("[" + tag + "] " + timestamp + " ")
l.logger.Output(2, s) //nolint:errcheck
l.loggerMu.Unlock()
}
func (l *logger) getLogLevel(tag string) LogLevel {
for _, logTag := range l.tags {
if logTag.Name == tag {
return logTag.LogLevel
}
}
return l.level
}