Show Worker's "last seen" timestamp in web interface & API responses

internal/manager/api_impl/worker_mgt.go

@@ -122,6 +122,11 @@ func workerSummary(w persistence.Worker) api.WorkerSummary {
 			IsLazy: w.LazyStatusRequest,
 		}
 	}
+
+	if !w.LastSeenAt.IsZero() {
+		summary.LastSeen = &w.LastSeenAt
+	}
+
 	return summary
 }
 

internal/manager/webupdates/worker_updates.go

@@ -28,6 +28,10 @@ func NewWorkerUpdate(worker *persistence.Worker) api.SocketIOWorkerUpdate {
 		}
 	}
 
+	if !worker.LastSeenAt.IsZero() {
+		workerUpdate.LastSeen = &worker.LastSeenAt
+	}
+
 	return workerUpdate
 }
 

web/app/src/components/workers/WorkerDetails.vue

@@ -12,6 +12,11 @@
       <dt class="field-status">Status</dt>
       <dd v-html="workerStatusHTML"></dd>
 
+      <template v-if="workerData.last_seen">
+      <dt class="field-last_seen">Last Seen</dt>
+      <dd>{{ datetime.relativeTime(workerData.last_seen) }}</dd>
+      </template>
+
       <dt class="field-version">Version</dt>
       <dd title="Version of Flamenco">{{ workerData.version }}</dd>