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coredns/core/dnsserver/view.go

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package dnsserver
import (
"context"
"github.com/coredns/coredns/request"
)
// Viewer - If Viewer is implemented by a plugin in a server block, its Filter()
// is added to the server block's filter functions when starting the server. When a running server
// serves a DNS request, it will route the request to the first Config (server block) that passes
// all its filter functions.
type Viewer interface {
// Filter returns true if the server should use the server block in which the implementing plugin resides, and the
// name of the view for metrics logging.
Filter(ctx context.Context, req *request.Request) bool
// ViewName returns the name of the view
ViewName() string
}