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990460ee7c
* middleware/file: don't reload zone when SOA isn't changed Give Parse an extra argument which is the SOA's serial, if > 0 we check against the just parsed SOA and then just return. Most notable use is in reload.go which is both used in the file and auto middleware. Fixes #415 * PR comments
110 lines
2.2 KiB
Go
110 lines
2.2 KiB
Go
package auto
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import (
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"log"
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"os"
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"path"
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"path/filepath"
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"regexp"
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"github.com/coredns/coredns/middleware/file"
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"github.com/miekg/dns"
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)
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// Walk will recursively walk of the file under l.directory and adds the one that match l.re.
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func (a Auto) Walk() error {
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// TODO(miek): should add something so that we don't stomp on each other.
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toDelete := make(map[string]bool)
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for _, n := range a.Zones.Names() {
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toDelete[n] = true
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}
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filepath.Walk(a.loader.directory, func(path string, info os.FileInfo, err error) error {
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if info == nil || info.IsDir() {
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return nil
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}
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match, origin := matches(a.loader.re, info.Name(), a.loader.template)
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if !match {
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return nil
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}
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if _, ok := a.Zones.Z[origin]; ok {
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// we already have this zone
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toDelete[origin] = false
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return nil
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}
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reader, err := os.Open(path)
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if err != nil {
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log.Printf("[WARNING] Opening %s failed: %s", path, err)
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return nil
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}
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defer reader.Close()
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// Serial for loading a zone is 0, because it is a new zone.
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zo, err := file.Parse(reader, origin, path, 0)
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if err != nil {
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log.Printf("[WARNING] Parse zone `%s': %v", origin, err)
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return nil
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}
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zo.NoReload = a.loader.noReload
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zo.Proxy = a.loader.proxy
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zo.TransferTo = a.loader.transferTo
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a.Zones.Add(zo, origin)
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if a.metrics != nil {
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a.metrics.AddZone(origin)
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}
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zo.Notify()
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log.Printf("[INFO] Inserting zone `%s' from: %s", origin, path)
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toDelete[origin] = false
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return nil
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})
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for origin, ok := range toDelete {
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if !ok {
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continue
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}
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if a.metrics != nil {
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a.metrics.RemoveZone(origin)
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}
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a.Zones.Remove(origin)
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log.Printf("[INFO] Deleting zone `%s'", origin)
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}
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return nil
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}
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// matches matches re to filename, if is is a match, the subexpression will be used to expand
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// template to an origin. When match is true that origin is returned. Origin is fully qualified.
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func matches(re *regexp.Regexp, filename, template string) (match bool, origin string) {
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base := path.Base(filename)
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matches := re.FindStringSubmatchIndex(base)
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if matches == nil {
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return false, ""
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}
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by := re.ExpandString(nil, template, base, matches)
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if by == nil {
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return false, ""
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}
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origin = dns.Fqdn(string(by))
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return true, origin
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}
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