43 lines
1.1 KiB
Go
43 lines
1.1 KiB
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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// ContextWithMetadata is exported for use by provider tests
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func ContextWithMetadata(ctx context.Context) context.Context {
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return context.WithValue(ctx, key{}, md{})
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}
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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 = ContextWithMetadata(ctx)
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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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