d8714e64e4
* Rename middleware to plugin first pass; mostly used 'sed', few spots where I manually changed text. This still builds a coredns binary. * fmt error * Rename AddMiddleware to AddPlugin * Readd AddMiddleware to remain backwards compat
93 lines
2.1 KiB
Go
93 lines
2.1 KiB
Go
package autopath
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import (
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"fmt"
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"github.com/coredns/coredns/core/dnsserver"
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"github.com/coredns/coredns/plugin"
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"github.com/coredns/coredns/plugin/erratic"
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"github.com/coredns/coredns/plugin/kubernetes"
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"github.com/mholt/caddy"
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"github.com/miekg/dns"
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)
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func init() {
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caddy.RegisterPlugin("autopath", caddy.Plugin{
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ServerType: "dns",
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Action: setup,
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})
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}
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func setup(c *caddy.Controller) error {
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ap, mw, err := autoPathParse(c)
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if err != nil {
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return plugin.Error("autopath", err)
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}
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// Do this in OnStartup, so all plugin has been initialized.
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c.OnStartup(func() error {
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m := dnsserver.GetConfig(c).Handler(mw)
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if m == nil {
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return nil
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}
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if x, ok := m.(*kubernetes.Kubernetes); ok {
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ap.searchFunc = x.AutoPath
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}
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if x, ok := m.(*erratic.Erratic); ok {
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ap.searchFunc = x.AutoPath
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}
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return nil
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})
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dnsserver.GetConfig(c).AddPlugin(func(next plugin.Handler) plugin.Handler {
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ap.Next = next
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return ap
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})
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return nil
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}
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// allowedMiddleware has a list of plugin that can be used by autopath.
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var allowedMiddleware = map[string]bool{
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"@kubernetes": true,
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"@erratic": true,
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}
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func autoPathParse(c *caddy.Controller) (*AutoPath, string, error) {
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ap := &AutoPath{}
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mw := ""
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for c.Next() {
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zoneAndresolv := c.RemainingArgs()
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if len(zoneAndresolv) < 1 {
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return ap, "", fmt.Errorf("no resolv-conf specified")
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}
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resolv := zoneAndresolv[len(zoneAndresolv)-1]
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if resolv[0] == '@' {
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_, ok := allowedMiddleware[resolv]
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if ok {
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mw = resolv[1:]
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}
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} else {
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// assume file on disk
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rc, err := dns.ClientConfigFromFile(resolv)
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if err != nil {
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return ap, "", fmt.Errorf("failed to parse %q: %v", resolv, err)
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}
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ap.search = rc.Search
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plugin.Zones(ap.search).Normalize()
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ap.search = append(ap.search, "") // sentinal value as demanded.
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}
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ap.Zones = zoneAndresolv[:len(zoneAndresolv)-1]
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if len(ap.Zones) == 0 {
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ap.Zones = make([]string, len(c.ServerBlockKeys))
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copy(ap.Zones, c.ServerBlockKeys)
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}
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for i, str := range ap.Zones {
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ap.Zones[i] = plugin.Host(str).Normalize()
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}
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}
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return ap, mw, nil
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}
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