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plugin/view: Advanced routing interface and new 'view' plugin (#5538)

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* 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>
This commit is contained in:
Chris O'Haver
2022-09-08 14:56:27 -04:00
committed by GitHub
parent 1f0a41a665
commit b56b080a7c
36 changed files with 880 additions and 114 deletions
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13
plugin/metrics/context.go
View File

@@ -22,3 +22,16 @@ func WithServer(ctx context.Context) string {
}
return srv.(*dnsserver.Server).Addr
}
// WithView returns the name of the view currently handling the request, if a view is defined.
//
// Basic usage with a metric:
//
// <metric>.WithLabelValues(metrics.WithView(ctx), labels..).Add(1)
func WithView(ctx context.Context) string {
v := ctx.Value(dnsserver.ViewKey{})
if v == nil {
return ""
}
return v.(string)
}