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dwelling-upload/pkg/logging/logger.go

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package logging
import (
"fmt"
"io"
"os"
"strings"
"sync"
"time"
"github.com/pkg/errors"
)
type Logger struct {
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file io.WriteCloser
toStdout bool
mut sync.Mutex
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}
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// NewLogger creates a Logger instance with given filename and
// toStdout tells wether to write to Stdout as well or not.
func NewLogger(path string, toStdout bool) (*Logger, error) {
f, err := os.OpenFile(path, os.O_WRONLY|os.O_APPEND|os.O_CREATE, 0660)
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if err != nil {
return nil, errors.Wrap(err, "failed to open log file")
}
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return &Logger{file: f, toStdout: toStdout}, nil
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}
func (l *Logger) Println(v ...interface{}) {
l.mut.Lock()
defer l.mut.Unlock()
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nowStr := time.Now().UTC().Format(time.RFC3339)
fmt.Fprintln(l.file, nowStr, v)
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if l.toStdout {
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fmt.Println(v...)
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}
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}
func (l *Logger) Printf(format string, v ...interface{}) {
l.mut.Lock()
defer l.mut.Unlock()
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// Ensure a new line will be written
if !strings.HasSuffix(format, "\n") {
format += "\n"
}
nowStr := time.Now().UTC().Format(time.RFC3339)
fmt.Fprintf(l.file, nowStr+" "+format, v...)
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if l.toStdout {
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fmt.Printf(format, v...)
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}
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}
func (l *Logger) Fatalln(v ...interface{}) {
l.mut.Lock()
nowStr := time.Now().UTC().Format(time.RFC3339)
fmt.Fprintln(l.file, nowStr, v)
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if l.toStdout {
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fmt.Println(v...)
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}
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l.file.Close()
os.Exit(1)
}
func (l *Logger) Fatalf(format string, v ...interface{}) {
l.mut.Lock()
// Ensure a new line will be written
if !strings.HasSuffix(format, "\n") {
format += "\n"
}
nowStr := time.Now().UTC().Format(time.RFC3339)
fmt.Fprintf(l.file, nowStr+" "+format, v...)
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if l.toStdout {
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fmt.Printf(format, v...)
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}
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l.file.Close()
os.Exit(1)
}
func (l *Logger) Close() error {
return l.file.Close()
}