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b56b080a7c
* introduce new interface "dnsserver.Viewer", that allows a plugin implementing it to decide if a query should be routed into its server block. * add new plugin "view", that uses the new interface to enable a user to define expression based conditions that must be met for a query to be routed to its server block. Signed-off-by: Chris O'Haver <cohaver@infoblox.com>
38 lines
1013 B
Go
38 lines
1013 B
Go
package metrics
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import (
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"context"
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"github.com/coredns/coredns/core/dnsserver"
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)
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// WithServer returns the current server handling the request. It returns the
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// server listening address: <scheme>://[<bind>]:<port> Normally this is
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// something like "dns://:53", but if the bind plugin is used, i.e. "bind
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// 127.0.0.53", it will be "dns://127.0.0.53:53", etc. If not address is found
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// the empty string is returned.
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//
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// Basic usage with a metric:
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//
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// <metric>.WithLabelValues(metrics.WithServer(ctx), labels..).Add(1)
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func WithServer(ctx context.Context) string {
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srv := ctx.Value(dnsserver.Key{})
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if srv == nil {
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return ""
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}
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return srv.(*dnsserver.Server).Addr
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}
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// WithView returns the name of the view currently handling the request, if a view is defined.
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//
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// Basic usage with a metric:
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//
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// <metric>.WithLabelValues(metrics.WithView(ctx), labels..).Add(1)
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func WithView(ctx context.Context) string {
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v := ctx.Value(dnsserver.ViewKey{})
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if v == nil {
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return ""
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}
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return v.(string)
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}
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