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file.go
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file.go
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// Copyright 2020 Douyu
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package file
import (
"io/ioutil"
"log"
"path/filepath"
"github.com/douyu/jupiter/pkg/util/xfile"
"github.com/douyu/jupiter/pkg/util/xgo"
"github.com/douyu/jupiter/pkg/xlog"
"github.com/fsnotify/fsnotify"
)
// fileDataSource file provider.
type fileDataSource struct {
path string
dir string
enableWatch bool
changed chan struct{}
}
// NewDataSource returns new fileDataSource.
func NewDataSource(path string, watch bool) *fileDataSource {
absolutePath, err := filepath.Abs(path)
if err != nil {
xlog.Jupiter().Panic("new datasource", xlog.Any("err", err))
}
dir := xfile.CheckAndGetParentDir(absolutePath)
ds := &fileDataSource{path: absolutePath, dir: dir, enableWatch: watch}
if watch {
ds.changed = make(chan struct{}, 1)
xgo.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 {
xlog.Jupiter().Fatal("new file watcher", xlog.FieldMod("file datasource"), xlog.Any("err", err))
}
defer w.Close()
done := make(chan bool)
go func() {
for {
select {
case event := <-w.Events:
xlog.Jupiter().Debug("read watch event",
xlog.FieldMod("file datasource"),
xlog.String("event", filepath.Clean(event.Name)),
xlog.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)
xlog.Jupiter().Error("read watch error", xlog.FieldMod("file datasource"), xlog.Any("err", err))
}
}
}()
err = w.Add(fp.dir)
if err != nil {
log.Fatal(err)
}
<-done
}