feat: add empty status even if not executed yet

exporter/freeze.go

@@ -17,7 +17,7 @@ type frozenProbeHistory struct {
 	Target  string         `json:"target"`
 	Status  string         `json:"status"`
 	History []frozenRecord `json:"history"`
-	Updated string         `json:"updated"`
+	Updated string         `json:"updated,omitempty"`
 }
 
 func freezeProbeHistory(h *store.ProbeHistory) frozenProbeHistory {
@@ -36,13 +36,19 @@ func freezeProbeHistory(h *store.ProbeHistory) frozenProbeHistory {
 		})
 	}
 
-	last := h.Results[len(h.Results)-1]
+	status := "NA"
+	updated := ""
+	if len(h.Results) > 0 {
+		last := h.Results[len(h.Results)-1]
+		status = last.Status.String()
+		updated = last.CheckedAt.Format(time.RFC3339)
+	}
 
 	return frozenProbeHistory{
 		Target:  h.Target.String(),
-		Status:  last.Status.String(),
+		Status:  status,
 		History: hs,
-		Updated: last.CheckedAt.Format(time.RFC3339),
+		Updated: updated,
 	}
 }
 

exporter/templates/status.html

@@ -173,7 +173,7 @@ <h2>{{ .Target }}</h2>
                             <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><use xlink:href="#ok-icon" /></svg>
                         </span>
                     {{ end }}{{ end }}</div>
-                    <span class="updated">updated: <time>{{ .Updated }}</time></span>
+                    <span class="updated">updated: <time>{{ if .Updated }}{{ .Updated }}{{ else }}(not yet){{ end }}</time></span>
                 </section>{{ end }}
             </article>
 

exporter/templates/status.txt

@@ -5,7 +5,7 @@
     if eq .Status "NA"   }}─{{ end }}{{
     if eq .Status "????" }}━{{ end }}{{
     if eq .Status "FAIL" }}!{{ end }}{{
-    if eq .Status "OK"   }}✓{{ end }}{{ end }}┤  updated: {{ .Updated }}
+    if eq .Status "OK"   }}✓{{ end }}{{ end }}┤  updated: {{ if .Updated }}{{ .Updated }}{{ else }}(not yet){{ end }}
 {{ end }}
 
 ──────────────────────────────┤ Current Incident ├──────────────────────────────

main.go

@@ -156,9 +156,16 @@ func RunServer(tasks []Task) {
 	scheduler := cron.New()
 	store := store.New(*storePath)
 
+	if err := store.Restore(); err != nil {
+		fmt.Fprintf(os.Stderr, "failed to create or open log file: %s\n", err)
+		os.Exit(1)
+	}
+
 	for _, t := range tasks {
 		fmt.Printf("%s\t%s\n", t.Schedule, t.Probe.Target())
 
+		store.AddTarget(t.Probe.Target())
+
 		f := t.Probe.Check
 		job := func() {
 			store.Append(f())
@@ -172,11 +179,6 @@ func RunServer(tasks []Task) {
 	}
 	fmt.Println()
 
-	if err := store.Restore(); err != nil {
-		fmt.Fprintf(os.Stderr, "failed to create or open log file: %s\n", err)
-		os.Exit(1)
-	}
-
 	scheduler.Start()
 	defer scheduler.Stop()
 

store/store.go

@@ -143,3 +143,14 @@ func (s *Store) Restore() error {
 
 	return nil
 }
+
+func (s *Store) AddTarget(target *url.URL) {
+	s.Lock()
+	defer s.Unlock()
+
+	if _, ok := s.ProbeHistory[target.String()]; !ok {
+		s.ProbeHistory[target.String()] = &ProbeHistory{
+			Target: target,
+		}
+	}
+}