149 lines
3.5 KiB
Go
149 lines
3.5 KiB
Go
package chart
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import (
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"fmt"
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"io"
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"os"
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"time"
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)
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var (
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_ Logger = (*StdoutLogger)(nil)
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)
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// NewLogger returns a new logger.
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func NewLogger(options ...LoggerOption) Logger {
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stl := &StdoutLogger{
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TimeFormat: time.RFC3339Nano,
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Stdout: os.Stdout,
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Stderr: os.Stderr,
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}
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for _, option := range options {
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option(stl)
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}
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return stl
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}
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// Logger is a type that implements the logging interface.
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type Logger interface {
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Info(...interface{})
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Infof(string, ...interface{})
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Debug(...interface{})
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Debugf(string, ...interface{})
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Err(error)
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FatalErr(error)
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Error(...interface{})
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Errorf(string, ...interface{})
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}
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// Info logs an info message if the logger is set.
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func Info(log Logger, arguments ...interface{}) {
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if log == nil {
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return
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}
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log.Info(arguments...)
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}
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// Infof logs an info message if the logger is set.
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func Infof(log Logger, format string, arguments ...interface{}) {
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if log == nil {
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return
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}
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log.Infof(format, arguments...)
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}
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// Debug logs an debug message if the logger is set.
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func Debug(log Logger, arguments ...interface{}) {
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if log == nil {
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return
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}
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log.Debug(arguments...)
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}
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// Debugf logs an debug message if the logger is set.
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func Debugf(log Logger, format string, arguments ...interface{}) {
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if log == nil {
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return
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}
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log.Debugf(format, arguments...)
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}
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// LoggerOption mutates a stdout logger.
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type LoggerOption = func(*StdoutLogger)
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//OptLoggerStdout sets the Stdout writer.
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func OptLoggerStdout(wr io.Writer) LoggerOption {
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return func(stl *StdoutLogger) {
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stl.Stdout = wr
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}
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}
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// OptLoggerStderr sets the Stdout writer.
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func OptLoggerStderr(wr io.Writer) LoggerOption {
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return func(stl *StdoutLogger) {
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stl.Stderr = wr
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}
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}
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// StdoutLogger is a basic logger.
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type StdoutLogger struct {
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TimeFormat string
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Stdout io.Writer
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Stderr io.Writer
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}
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// Info writes an info message.
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func (l *StdoutLogger) Info(arguments ...interface{}) {
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l.Println(append([]interface{}{"[INFO]"}, arguments...)...)
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}
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// Infof writes an info message.
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func (l *StdoutLogger) Infof(format string, arguments ...interface{}) {
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l.Println(append([]interface{}{"[INFO]"}, fmt.Sprintf(format, arguments...))...)
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}
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// Debug writes an debug message.
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func (l *StdoutLogger) Debug(arguments ...interface{}) {
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l.Println(append([]interface{}{"[DEBUG]"}, arguments...)...)
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}
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// Debugf writes an debug message.
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func (l *StdoutLogger) Debugf(format string, arguments ...interface{}) {
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l.Println(append([]interface{}{"[DEBUG]"}, fmt.Sprintf(format, arguments...))...)
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}
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// Error writes an error message.
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func (l *StdoutLogger) Error(arguments ...interface{}) {
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l.Println(append([]interface{}{"[ERROR]"}, arguments...)...)
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}
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// Errorf writes an error message.
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func (l *StdoutLogger) Errorf(format string, arguments ...interface{}) {
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l.Println(append([]interface{}{"[ERROR]"}, fmt.Sprintf(format, arguments...))...)
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}
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// Err writes an error message.
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func (l *StdoutLogger) Err(err error) {
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if err != nil {
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l.Println(append([]interface{}{"[ERROR]"}, err.Error())...)
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}
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}
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// FatalErr writes an error message and exits.
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func (l *StdoutLogger) FatalErr(err error) {
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if err != nil {
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l.Println(append([]interface{}{"[FATAL]"}, err.Error())...)
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os.Exit(1)
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}
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}
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// Println prints a new message.
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func (l *StdoutLogger) Println(arguments ...interface{}) {
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fmt.Fprintln(l.Stdout, append([]interface{}{time.Now().UTC().Format(l.TimeFormat)}, arguments...)...)
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}
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// Errorln prints a new message.
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func (l *StdoutLogger) Errorln(arguments ...interface{}) {
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fmt.Fprintln(l.Stderr, append([]interface{}{time.Now().UTC().Format(l.TimeFormat)}, arguments...)...)
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}
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