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package file
import (
"os"
"time"
)
// Reload reloads a zone when it is changed on disk. If z.NoReload is true, no reloading will be done.
func (z *Zone) Reload() error {
if z.ReloadInterval == 0 {
return nil
}
tick := time.NewTicker(z.ReloadInterval)
go func() {
for {
select {
case <-tick.C:
zFile := z.File()
reader, err := os.Open(zFile)
if err != nil {
log.Errorf("Failed to open zone %q in %q: %v", z.origin, zFile, err)
continue
}
serial := z.SOASerialIfDefined()
zone, err := Parse(reader, z.origin, zFile, serial)
if err != nil {
if _, ok := err.(*serialErr); !ok {
log.Errorf("Parsing zone %q: %v", z.origin, err)
}
continue
}
// copy elements we need
z.reloadMu.Lock()
z.Apex = zone.Apex
z.Tree = zone.Tree
z.reloadMu.Unlock()
log.Infof("Successfully reloaded zone %q in %q with serial %d", z.origin, zFile, z.Apex.SOA.Serial)
z.Notify()
case <-z.reloadShutdown:
tick.Stop()
return
}
}
}()
return nil
}
// SOASerialIfDefined returns the SOA's serial if the zone has a SOA record in the Apex, or
// -1 otherwise.
func (z *Zone) SOASerialIfDefined() int64 {
z.reloadMu.Lock()
defer z.reloadMu.Unlock()
if z.Apex.SOA != nil {
return int64(z.Apex.SOA.Serial)
}
return -1
}
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