A compatible log extension
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log/filewriter.go

113 lines
1.8 KiB

package log
import (
"io"
"os"
"path/filepath"
"sync"
"time"
)
var _ io.Writer = &Files{}
type ByType int
const (
ByDay ByType = iota
ByHour
ByMonth
)
var (
formats = map[ByType]string{
ByDay: "2006-01-02",
ByHour: "2006-01-02-15",
ByMonth: "2006-01",
}
)
func SetFileFormat(t ByType, format string) {
formats[t] = format
}
func (b ByType) Format() string {
return formats[b]
}
type Files struct {
FileOptions
f *os.File
lastFormat string
lock sync.Mutex
}
type FileOptions struct {
Dir string
ByType ByType
Loc *time.Location
}
func prepareFileOption(opts []FileOptions) FileOptions {
var opt FileOptions
if len(opts) > 0 {
opt = opts[0]
}
if opt.Dir == "" {
opt.Dir = "./"
}
err := os.MkdirAll(opt.Dir, os.ModePerm)
if err != nil {
panic(err.Error())
}
if opt.Loc == nil {
opt.Loc = time.Local
}
return opt
}
func NewFileWriter(opts ...FileOptions) *Files {
opt := prepareFileOption(opts)
return &Files{
FileOptions: opt,
}
}
func (f *Files) getFile() (*os.File, error) {
var err error
t := time.Now().In(f.Loc)
if f.f == nil {
f.lastFormat = t.Format(f.ByType.Format())
f.f, err = os.OpenFile(filepath.Join(f.Dir, f.lastFormat+".log"),
os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0600)
return f.f, err
}
if f.lastFormat != t.Format(f.ByType.Format()) {
f.f.Close()
f.lastFormat = t.Format(f.ByType.Format())
f.f, err = os.OpenFile(filepath.Join(f.Dir, f.lastFormat+".log"),
os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0600)
return f.f, err
}
return f.f, nil
}
func (f *Files) Write(bs []byte) (int, error) {
f.lock.Lock()
defer f.lock.Unlock()
w, err := f.getFile()
if err != nil {
return 0, err
}
return w.Write(bs)
}
func (f *Files) Close() {
if f.f != nil {
f.f.Close()
f.f = nil
}
f.lastFormat = ""
}