99800a687c
This revert 17d807f0 and re-adds the metadata plugin as a plugin that
just sets a label to a value function.
Add package documentation on how to use the metadata package. Make it
clear that any caching is up to the Func implemented.
There are now - no in tree users. We could add the request metadata by
default under names that copy request.Request, i.e
request/ip - remote IP
request/port - remote port
Variables.go has been deleted.
Signed-off-by: Miek Gieben <miek@miek.nl>
61 lines
1.2 KiB
Go
61 lines
1.2 KiB
Go
package metadata
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import (
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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/mholt/caddy"
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)
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func init() {
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caddy.RegisterPlugin("metadata", 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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m, err := metadataParse(c)
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if err != nil {
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return err
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}
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dnsserver.GetConfig(c).AddPlugin(func(next plugin.Handler) plugin.Handler {
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m.Next = next
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return m
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})
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c.OnStartup(func() error {
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plugins := dnsserver.GetConfig(c).Handlers()
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for _, p := range plugins {
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if met, ok := p.(Provider); ok {
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m.Providers = append(m.Providers, met)
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}
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}
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return nil
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})
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return nil
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}
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func metadataParse(c *caddy.Controller) (*Metadata, error) {
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m := &Metadata{}
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c.Next()
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zones := c.RemainingArgs()
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if len(zones) != 0 {
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m.Zones = zones
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for i := 0; i < len(m.Zones); i++ {
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m.Zones[i] = plugin.Host(m.Zones[i]).Normalize()
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}
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} else {
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m.Zones = make([]string, len(c.ServerBlockKeys))
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for i := 0; i < len(c.ServerBlockKeys); i++ {
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m.Zones[i] = plugin.Host(c.ServerBlockKeys[i]).Normalize()
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}
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}
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if c.NextBlock() || c.Next() {
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return nil, plugin.Error("metadata", c.ArgErr())
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}
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return m, nil
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}
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