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file.go
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file.go
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package file
import (
"io/ioutil"
"log"
"github.com/xqk/ox/pkg/olog"
"github.com/xqk/ox/pkg/util/ofile"
"github.com/xqk/ox/pkg/util/ogo"
"path/filepath"
"github.com/fsnotify/fsnotify"
)
// fileDataSource file provider.
type fileDataSource struct {
path string
dir string
enableWatch bool
changed chan struct{}
logger *olog.Logger
}
// NewDataSource returns new fileDataSource.
func NewDataSource(path string, watch bool) *fileDataSource {
absolutePath, err := filepath.Abs(path)
if err != nil {
olog.Panic("new datasource", olog.Any("err", err))
}
dir := ofile.CheckAndGetParentDir(absolutePath)
ds := &fileDataSource{path: absolutePath, dir: dir, enableWatch: watch}
if watch {
ds.changed = make(chan struct{}, 1)
ogo.Go(ds.watch)
}
return ds
}
// ReadConfig ...
func (fp *fileDataSource) ReadConfig() (content []byte, err error) {
return ioutil.ReadFile(fp.path)
}
// Close ...
func (fp *fileDataSource) Close() error {
close(fp.changed)
return nil
}
// IsConfigChanged ...
func (fp *fileDataSource) IsConfigChanged() <-chan struct{} {
return fp.changed
}
// Watch file and automate update.
func (fp *fileDataSource) watch() {
w, err := fsnotify.NewWatcher()
if err != nil {
olog.Fatal("new file watcher", olog.FieldMod("file datasource"), olog.Any("err", err))
}
defer w.Close()
done := make(chan bool)
go func() {
for {
select {
case event := <-w.Events:
olog.Debug("read watch event",
olog.FieldMod("file datasource"),
olog.String("event", filepath.Clean(event.Name)),
olog.String("path", filepath.Clean(fp.path)),
)
// we only care about the config file with the following cases:
// 1 - if the config file was modified or created
// 2 - if the real path to the config file changed
const writeOrCreateMask = fsnotify.Write | fsnotify.Create
if event.Op&writeOrCreateMask != 0 && filepath.Clean(event.Name) == filepath.Clean(fp.path) {
log.Println("modified file: ", event.Name)
select {
case fp.changed <- struct{}{}:
default:
}
}
case err := <-w.Errors:
// log.Println("error: ", err)
olog.Error("read watch error", olog.FieldMod("file datasource"), olog.Any("err", err))
}
}
}()
err = w.Add(fp.dir)
if err != nil {
log.Fatal(err)
}
<-done
}