66 lines
1.2 KiB
Go
66 lines
1.2 KiB
Go
package gost
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import (
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"io"
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"os"
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"time"
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"github.com/go-log/log"
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)
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// Reloader is the interface for objects that support live reloading.
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type Reloader interface {
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Reload(r io.Reader) error
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Period() time.Duration
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}
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// Stoppable is the interface that indicates a Reloader can be stopped.
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type Stoppable interface {
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Stop()
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Stopped() bool
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}
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// PeriodReload reloads the config configFile periodically according to the period of the Reloader r.
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func PeriodReload(r Reloader, configFile string) error {
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if r == nil || configFile == "" {
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return nil
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}
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var lastMod time.Time
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for {
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if r.Period() < 0 {
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log.Log("[reload] stopped:", configFile)
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return nil
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}
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f, err := os.Open(configFile)
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if err != nil {
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return err
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}
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mt := lastMod
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if finfo, err := f.Stat(); err == nil {
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mt = finfo.ModTime()
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}
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if !lastMod.IsZero() && !mt.Equal(lastMod) {
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log.Log("[reload]", configFile)
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if err := r.Reload(f); err != nil {
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log.Logf("[reload] %s: %s", configFile, err)
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}
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}
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f.Close()
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lastMod = mt
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period := r.Period()
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if period == 0 {
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log.Log("[reload] disabled:", configFile)
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return nil
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}
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if period < time.Second {
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period = time.Second
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}
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<-time.After(period)
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}
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}
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