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logger.go
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logger.go
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package gocli
import (
"context"
"fmt"
"log"
"os"
)
const (
LogLevelDebug = 1 << iota
LogLevelInfo
LogLevelWarn
LogLevelErr
DefaultCallDepth = 3
DefaultKeyLoggerPrefix = "prefix"
)
// Logger Common logger interface
type Logger interface {
Output(callDepth int, message string) error
Print(v ...interface{})
Println(v ...interface{})
Printf(format string, v ...interface{})
Info(v ...interface{})
Infoln(v ...interface{})
Infof(format string, v ...interface{})
Warn(v ...interface{})
Warnln(v ...interface{})
Warnf(format string, v ...interface{})
Error(v ...interface{})
Errorln(v ...interface{})
Errorf(format string, v ...interface{})
}
// LoggerFormat logger prefix
type LoggerFormat map[string]string
// FromContext create log prefix from context
func (lf LoggerFormat) FromContext(ctx context.Context) string {
var prefix string
for key, value := range lf {
if v, ok := ctx.Value(key).(string); ok {
prefix += fmt.Sprintf(value, v) + " "
}
}
return prefix
}
// String serialize format to string
func (lf LoggerFormat) String() string {
if v, ok := lf[DefaultKeyLoggerPrefix]; ok {
return v + " "
}
return ""
}
// LoggerConfig configuration of logger
type LoggerConfig struct {
// Level of log message
Level int
// Default is 2
Depth int
// Flags
Flags int
// Format for multiple arguments
Format LoggerFormat
}
// NewLogger Init logger struct
func NewLogger(config LoggerConfig) Logger {
if config.Depth == 0 {
config.Depth = DefaultCallDepth
}
if config.Level == 0 {
config.Level = LogLevelDebug
}
if config.Flags == 0 {
config.Flags = log.Ldate | log.Ltime | log.Lshortfile
}
return &logger{config: config, stdLogger: log.New(os.Stdout, config.Format.String(), config.Flags)}
}
// logger struct
type logger struct {
config LoggerConfig
stdLogger *log.Logger
}
// Output printing message
func (l logger) Output(callDepth int, message string) error {
return l.stdLogger.Output(callDepth, message)
}
// Print printing message
func (l logger) Print(v ...interface{}) {
if len(v) > 0 {
if c, ok := v[0].(context.Context); ok {
l.Output(l.config.Depth, l.config.Format.FromContext(c)+fmt.Sprint(v[1:]...))
return
}
}
l.Output(l.config.Depth, fmt.Sprint(v...))
}
// Info printing message at info level
func (l logger) Info(v ...interface{}) {
if (l.config.Level & (LogLevelInfo | LogLevelDebug)) != 0 {
if len(v) > 0 {
if c, ok := v[0].(context.Context); ok {
l.Output(l.config.Depth, l.config.Format.FromContext(c)+fmt.Sprint(v[1:]...))
return
}
}
l.Output(l.config.Depth, fmt.Sprint(v...))
}
}
// Warn printing message at warn level
func (l logger) Warn(v ...interface{}) {
if (l.config.Level & (LogLevelWarn | LogLevelDebug)) != 0 {
if len(v) > 0 {
if c, ok := v[0].(context.Context); ok {
l.Output(l.config.Depth, l.config.Format.FromContext(c)+fmt.Sprint(v[1:]...))
return
}
}
l.Output(l.config.Depth, fmt.Sprint(v...))
}
}
// Error printing message at error level
func (l logger) Error(v ...interface{}) {
if (l.config.Level & (LogLevelErr | LogLevelDebug)) != 0 {
if len(v) > 0 {
if c, ok := v[0].(context.Context); ok {
l.Output(l.config.Depth, l.config.Format.FromContext(c)+fmt.Sprint(v[1:]...))
return
}
}
l.Output(l.config.Depth, fmt.Sprint(v...))
}
}
// Println printing message with new line symbol
func (l logger) Println(v ...interface{}) {
if len(v) > 0 {
if c, ok := v[0].(context.Context); ok {
l.Output(l.config.Depth, l.config.Format.FromContext(c)+fmt.Sprintln(v[1:]...))
return
}
}
l.Output(l.config.Depth, fmt.Sprintln(v...))
}
// Infoln printing message with new line symbol at info level
func (l logger) Infoln(v ...interface{}) {
if (l.config.Level & (LogLevelInfo | LogLevelDebug)) != 0 {
if len(v) > 0 {
if c, ok := v[0].(context.Context); ok {
l.Output(l.config.Depth, l.config.Format.FromContext(c)+fmt.Sprintln(v[1:]...))
return
}
}
l.Output(l.config.Depth, fmt.Sprintln(v...))
}
}
// Warnln printing message with new line symbol at warn level
func (l logger) Warnln(v ...interface{}) {
if (l.config.Level & (LogLevelWarn | LogLevelDebug)) != 0 {
if len(v) > 0 {
if c, ok := v[0].(context.Context); ok {
l.Output(l.config.Depth, l.config.Format.FromContext(c)+fmt.Sprintln(v[1:]...))
return
}
}
l.Output(l.config.Depth, fmt.Sprintln(v...))
}
}
// Errorln printing message with new line symbol at error level
func (l logger) Errorln(v ...interface{}) {
if (l.config.Level & (LogLevelErr | LogLevelDebug)) != 0 {
if len(v) > 0 {
if c, ok := v[0].(context.Context); ok {
l.Output(l.config.Depth, l.config.Format.FromContext(c)+fmt.Sprintln(v[1:]...))
return
}
}
l.Output(l.config.Depth, fmt.Sprintln(v...))
}
}
// Printf printing message in custom format
func (l logger) Printf(format string, v ...interface{}) {
if len(v) > 0 {
if c, ok := v[0].(context.Context); ok {
l.Output(l.config.Depth, l.config.Format.FromContext(c)+fmt.Sprintf(format, v[1:]...))
return
}
}
l.Output(l.config.Depth, fmt.Sprintf(format, v...))
}
// Infof printing message in custom format at info level
func (l logger) Infof(format string, v ...interface{}) {
if (l.config.Level & (LogLevelInfo | LogLevelDebug)) != 0 {
if len(v) > 0 {
if c, ok := v[0].(context.Context); ok {
l.Output(l.config.Depth, l.config.Format.FromContext(c)+fmt.Sprintf(format, v[1:]...))
return
}
}
l.Output(l.config.Depth, fmt.Sprintf(format, v...))
}
}
// Warnf printing message in custom format at warn level
func (l logger) Warnf(format string, v ...interface{}) {
if (l.config.Level & (LogLevelWarn | LogLevelDebug)) != 0 {
if len(v) > 0 {
if c, ok := v[0].(context.Context); ok {
l.Output(l.config.Depth, l.config.Format.FromContext(c)+fmt.Sprintf(format, v[1:]...))
return
}
}
l.Output(l.config.Depth, fmt.Sprintf(format, v...))
}
}
// Errorf printing message in custom format at error level
func (l logger) Errorf(format string, v ...interface{}) {
if (l.config.Level & (LogLevelErr | LogLevelDebug)) != 0 {
if len(v) > 0 {
if c, ok := v[0].(context.Context); ok {
l.Output(l.config.Depth, l.config.Format.FromContext(c)+fmt.Sprintf(format, v[1:]...))
return
}
}
l.Output(l.config.Depth, fmt.Sprintf(format, v...))
}
}