156 lines
2.6 KiB
Go
156 lines
2.6 KiB
Go
package provider
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import (
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"bytes"
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"crypto/md5"
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"io/ioutil"
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"os"
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"time"
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"github.com/Dreamacro/clash/log"
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)
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var (
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fileMode os.FileMode = 0666
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)
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type parser = func([]byte) (interface{}, error)
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type fetcher struct {
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name string
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vehicle Vehicle
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updatedAt *time.Time
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ticker *time.Ticker
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hash [16]byte
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parser parser
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onUpdate func(interface{})
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}
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func (f *fetcher) Name() string {
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return f.name
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}
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func (f *fetcher) VehicleType() VehicleType {
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return f.vehicle.Type()
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}
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func (f *fetcher) Initial() (interface{}, error) {
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var (
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buf []byte
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err error
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isLocal bool
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)
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if stat, fErr := os.Stat(f.vehicle.Path()); fErr == nil {
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buf, err = ioutil.ReadFile(f.vehicle.Path())
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modTime := stat.ModTime()
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f.updatedAt = &modTime
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isLocal = true
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} else {
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buf, err = f.vehicle.Read()
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}
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if err != nil {
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return nil, err
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}
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proxies, err := f.parser(buf)
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if err != nil {
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if !isLocal {
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return nil, err
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}
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// parse local file error, fallback to remote
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buf, err = f.vehicle.Read()
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if err != nil {
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return nil, err
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}
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proxies, err = f.parser(buf)
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if err != nil {
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return nil, err
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}
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}
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if err := ioutil.WriteFile(f.vehicle.Path(), buf, fileMode); err != nil {
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return nil, err
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}
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f.hash = md5.Sum(buf)
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// pull proxies automatically
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if f.ticker != nil {
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go f.pullLoop()
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}
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return proxies, nil
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}
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func (f *fetcher) Update() (interface{}, bool, error) {
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buf, err := f.vehicle.Read()
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if err != nil {
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return nil, false, err
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}
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now := time.Now()
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hash := md5.Sum(buf)
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if bytes.Equal(f.hash[:], hash[:]) {
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f.updatedAt = &now
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return nil, true, nil
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}
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proxies, err := f.parser(buf)
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if err != nil {
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return nil, false, err
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}
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if err := ioutil.WriteFile(f.vehicle.Path(), buf, fileMode); err != nil {
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return nil, false, err
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}
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f.updatedAt = &now
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f.hash = hash
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return proxies, false, nil
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}
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func (f *fetcher) Destroy() error {
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if f.ticker != nil {
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f.ticker.Stop()
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}
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return nil
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}
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func (f *fetcher) pullLoop() {
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for range f.ticker.C {
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elm, same, err := f.Update()
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if err != nil {
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log.Warnln("[Provider] %s pull error: %s", f.Name(), err.Error())
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continue
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}
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if same {
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log.Debugln("[Provider] %s's proxies doesn't change", f.Name())
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continue
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}
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log.Infoln("[Provider] %s's proxies update", f.Name())
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if f.onUpdate != nil {
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f.onUpdate(elm)
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}
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}
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}
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func newFetcher(name string, interval time.Duration, vehicle Vehicle, parser parser, onUpdate func(interface{})) *fetcher {
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var ticker *time.Ticker
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if interval != 0 {
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ticker = time.NewTicker(interval)
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}
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return &fetcher{
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name: name,
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ticker: ticker,
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vehicle: vehicle,
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parser: parser,
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onUpdate: onUpdate,
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}
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}
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