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>
39 lines
953 B
Go
39 lines
953 B
Go
package metadata
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import (
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"context"
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"github.com/coredns/coredns/plugin"
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"github.com/coredns/coredns/request"
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"github.com/miekg/dns"
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)
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// Metadata implements collecting metadata information from all plugins that
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// implement the Provider interface.
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type Metadata struct {
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Zones []string
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Providers []Provider
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Next plugin.Handler
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}
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// Name implements the Handler interface.
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func (m *Metadata) Name() string { return "metadata" }
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// ServeDNS implements the plugin.Handler interface.
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func (m *Metadata) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg) (int, error) {
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ctx = context.WithValue(ctx, key{}, md{})
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state := request.Request{W: w, Req: r}
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if plugin.Zones(m.Zones).Matches(state.Name()) != "" {
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// Go through all Providers and collect metadata.
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for _, p := range m.Providers {
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ctx = p.Metadata(ctx, state)
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}
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}
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rcode, err := plugin.NextOrFailure(m.Name(), m.Next, ctx, w, r)
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return rcode, err
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}
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