Initial commit

checker/rules.go

@@ -0,0 +1,59 @@
+package checker
+
+import (
+	"context"
+	"fmt"
+
+	sdk "git.happydns.org/checker-sdk-go/checker"
+)
+
+// Rules returns every CheckRule exposed by the resolver-propagation checker.
+// Each rule covers one concern so the UI and metrics consumers can reason
+// about them independently.
+func Rules() []sdk.CheckRule {
+	return []sdk.CheckRule{
+		&resolverSelectionRule{},
+		&resolversReachableRule{},
+		&consensusRule{},
+		&authoritativeMatchRule{},
+		&nxdomainRule{},
+		&servfailRule{},
+		&regionalSplitRule{},
+		&serialDriftRule{},
+		&staleCacheRule{},
+		&dnssecRule{},
+		&resolverLatencyRule{},
+		&filteredHitRule{},
+	}
+}
+
+// loadData fetches the observation and returns an error state on failure.
+// It also runs deriveView so every rule sees a ready-to-use consensus.
+func loadData(ctx context.Context, obs sdk.ObservationGetter) (*ResolverPropagationData, *sdk.CheckState) {
+	var data ResolverPropagationData
+	if err := obs.Get(ctx, ObservationKeyResolverPropagation, &data); err != nil {
+		return nil, &sdk.CheckState{
+			Status:  sdk.StatusError,
+			Message: fmt.Sprintf("failed to load resolver-propagation observation: %v", err),
+			Code:    "resolver_propagation_error",
+		}
+	}
+	deriveView(&data)
+	return &data, nil
+}
+
+func passState(code, message string) sdk.CheckState {
+	return sdk.CheckState{Status: sdk.StatusOK, Message: message, Code: code}
+}
+
+func infoState(code, subject, message string) sdk.CheckState {
+	return sdk.CheckState{Status: sdk.StatusInfo, Message: message, Code: code, Subject: subject}
+}
+
+func warnState(code, subject, message string) sdk.CheckState {
+	return sdk.CheckState{Status: sdk.StatusWarn, Message: message, Code: code, Subject: subject}
+}
+
+func critState(code, subject, message string) sdk.CheckState {
+	return sdk.CheckState{Status: sdk.StatusCrit, Message: message, Code: code, Subject: subject}
+}