add stops info

server/MhdMapApp.js

@@ -14,6 +14,7 @@ export default class MhdMapApp {
         this.stops = null;
         this.oldVehicles = null;
         this.vehicles = null;
+        this.stopCache = {};
         this.lastUpdatedStatic = null;
         this.lastUpdatedDynamic = null;
         this.lastDelta = null;
@@ -92,6 +93,22 @@ export default class MhdMapApp {
         }
     }
 
+    async getStopInfo(stationStopId) {
+        let cached = this.stopCache[stationStopId] || null;
+        if (cached && cached.t.getTime() > (Date.now() - 15 * 1000)) { // cache for 15 seconds
+            return cached;
+        }
+
+        const data = await this.opendata.fetchOneStop(stationStopId);
+        if (!data)
+            return cached; // null or stale
+
+        return (this.stopCache[stationStopId] = {
+            t: new Date(),
+            data: data,
+        });
+    }
+
     calculateVehiclesDelta(beforeObj, afterObj) {
         let delta = {};
 
@@ -216,6 +233,8 @@ export default class MhdMapApp {
             return await this.recorder.getVehicleTrace(data.vehicle, data.count || 20);
         } else if (action === 'requestLineTrace') {
             return await this.recorder.getSimpleLineTrace(data.line, data.count || 20);
+        } else if (action === 'requestStopInfo') {
+            return await this.getStopInfo(data.stationStopId);
         }
         return null;
     }