Initial commit

checker/rules_reachability.go

@@ -0,0 +1,65 @@
+// This file is part of the happyDomain (R) project.
+// Copyright (c) 2020-2026 happyDomain
+// Authors: Pierre-Olivier Mercier, et al.
+
+package checker
+
+import (
+	"context"
+	"fmt"
+
+	sdk "git.happydns.org/checker-sdk-go/checker"
+)
+
+// reachabilityRule reports per-IP reachability for one scheme.
+type reachabilityRule struct {
+	scheme string // "http" or "https"
+	code   string
+}
+
+func (r *reachabilityRule) Name() string { return r.code }
+func (r *reachabilityRule) Description() string {
+	return fmt.Sprintf("Verifies that every probed IP accepts a %s connection on the standard port.", r.scheme)
+}
+
+func (r *reachabilityRule) Evaluate(ctx context.Context, obs sdk.ObservationGetter, _ sdk.CheckerOptions) []sdk.CheckState {
+	data, errSt := loadHTTPData(ctx, obs)
+	if errSt != nil {
+		return []sdk.CheckState{*errSt}
+	}
+	probes := probesByScheme(data.Probes, r.scheme)
+	if len(probes) == 0 {
+		return []sdk.CheckState{unknownState(r.code+".no_probes", "No probes were attempted.")}
+	}
+
+	var states []sdk.CheckState
+	for _, p := range probes {
+		switch {
+		case !p.TCPConnected:
+			states = append(states, sdk.CheckState{
+				Status:  sdk.StatusCrit,
+				Code:    r.code + ".unreachable",
+				Subject: p.Address,
+				Message: fmt.Sprintf("Cannot reach %s://%s on %s: %s", r.scheme, p.Host, p.Address, p.Error),
+			})
+		case p.StatusCode == 0:
+			states = append(states, sdk.CheckState{
+				Status:  sdk.StatusCrit,
+				Code:    r.code + ".no_response",
+				Subject: p.Address,
+				Message: fmt.Sprintf("TCP open but no HTTP response from %s: %s", p.Address, p.Error),
+			})
+		case p.StatusCode >= 500:
+			states = append(states, sdk.CheckState{
+				Status:  sdk.StatusWarn,
+				Code:    r.code + ".server_error",
+				Subject: p.Address,
+				Message: fmt.Sprintf("%s returned %d", p.Address, p.StatusCode),
+			})
+		}
+	}
+	if len(states) == 0 {
+		return []sdk.CheckState{passState(r.code+".ok", fmt.Sprintf("All %s probes responded successfully.", r.scheme))}
+	}
+	return states
+}