Initial commit

checker/provider.go

@@ -0,0 +1,40 @@
+package checker
+
+import (
+	"fmt"
+
+	sdk "git.happydns.org/checker-sdk-go/checker"
+)
+
+// Provider returns a new delegation observation provider.
+func Provider() sdk.ObservationProvider {
+	return &delegationProvider{}
+}
+
+type delegationProvider struct{}
+
+func (p *delegationProvider) Key() sdk.ObservationKey {
+	return ObservationKeyDelegation
+}
+
+// Definition implements sdk.CheckerDefinitionProvider so the SDK server can
+// expose /definition without an extra argument.
+func (p *delegationProvider) Definition() *sdk.CheckerDefinition {
+	return Definition()
+}
+
+// ValidateOptions implements sdk.OptionsValidator. Option values cross all
+// rules, so validating them once on the provider avoids duplicating the
+// check in every rule.
+func (p *delegationProvider) ValidateOptions(opts sdk.CheckerOptions) error {
+	if v, ok := opts["minNameServers"]; ok {
+		f, ok := v.(float64)
+		if !ok {
+			return fmt.Errorf("minNameServers must be a number")
+		}
+		if f < 1 {
+			return fmt.Errorf("minNameServers must be >= 1")
+		}
+	}
+	return nil
+}