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log.go
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log.go
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package cronsifter
import (
"bytes"
"fmt"
"os"
"path"
"time"
)
// Simple logger for writing to a file. This is heavily
// based on https://github.com/siddontang/go-log.
// SimpleLogger is a basic logging struct that provide log rotating.
type SimpleLogger struct {
file *os.File
filename string
maxBytes int
fileCount int
}
// NewSimpleLogger takes the filename, maxBytes and fileCount to create a
// SimpleLogger. maxBytes and fileCount are used to determine when to rotate
// the files.
func NewSimpleLogger(filename string, maxBytes, fileCount int) (*SimpleLogger, error) {
dir := path.Dir(filename)
os.Mkdir(dir, 0777)
sl := &SimpleLogger{filename: filename, maxBytes: maxBytes, fileCount: fileCount}
var err error
sl.file, err = os.OpenFile(sl.filename, os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0666)
if err != nil {
return nil, err
}
return sl, nil
}
// Write the given bytes to the file.
func (l *SimpleLogger) Write(b []byte) (int, error) {
l.rotate()
var buf bytes.Buffer
buf.WriteString(fmt.Sprintf("%s: ", time.Now().Format("Mon Jan 2 15:04:05 -0700 MST 2006")))
buf.Write(b)
if len(b) > 0 && b[len(b)-1] != '\n' {
buf.WriteString("\n")
}
return l.file.Write(buf.Bytes())
}
// Close the SimpleLogger's file handle.
func (l *SimpleLogger) Close() error {
if l.file != nil {
return l.file.Close()
}
return nil
}
func (l *SimpleLogger) rotate() error {
f, err := l.file.Stat()
if err != nil {
return err
}
if l.maxBytes <= 0 {
return fmt.Errorf("Max Bytes needs to be greater than 0 instead of: %d", l.maxBytes)
}
if f.Size() < int64(l.maxBytes) {
return nil
}
if l.fileCount > 0 {
l.file.Close()
for i := l.fileCount - 1; i > 0; i-- {
prev := fmt.Sprintf("%s.%d", l.filename, i)
next := fmt.Sprintf("%s.%d", l.filename, i+1)
os.Rename(prev, next)
}
next := fmt.Sprintf("%s.1", l.filename)
os.Rename(l.filename, next)
l.file, _ = os.OpenFile(l.filename, os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0666)
}
return nil
}