refactored owmweather, reload weather on NRF connect if due

apps/owmweather/ChangeLog

@@ -4,3 +4,4 @@
 0.04: Minor code improvements
 0.05: Upgrade OWM to One Call API 3.0. Add pressure to weather.json
 0.06: Fix One Call API 3.0 not returning city names, which are required by the weather app
+0.07: Update weather after reconnecting bluetooth if update is due, refactor code

apps/owmweather/boot.js

@@ -1,33 +1,51 @@
 {
-  let waiting = false;
+  let loading = false;
+  let timeoutRef = null;
   let settings = Object.assign(
     require('Storage').readJSON("owmweather.default.json", true) || {},
     require('Storage').readJSON("owmweather.json", true) || {}
   );
-  
-  let completion = function(){
-    waiting = false;
+
+  let refreshMillis = function () {
+    return settings.refresh * 1000 * 60
+  }
+
+  let nextDueDate = function () {
+    return settings.updated + refreshMillis() + 1
+  }
+
+  let onCompleted = function () {
+    loading = false;
     settings.updated = Date.now();
     require('Storage').writeJSON("owmweather.json", settings);
+    if (timeoutRef) clearTimeout(timeoutRef);
+    timeoutRef = setTimeout(loadIfDueAndReschedule, refreshMillis() + 1);
   }
 
-  if (settings.enabled) {    
+  let loadIfDueAndReschedule = function () {
+    // also check if the weather.json file has been updated (e.g. force refresh)
     let weather = require("Storage").readJSON('weather.json') || {};
-    if (weather && weather.weather && weather.weather.time) lastUpdate = weather.weather.time;
-
-    if (!settings.updated || settings.updated + settings.refresh * 1000 * 60 < Date.now()){
-      setTimeout(() => {
-        if (!waiting){
-          waiting = true;
-          require("owmweather").pull(completion);
-        }
-      }, 5000);
+    let lastWeatherUpdate = weather && weather.weather && weather.weather.time && weather.weather.time || 0;
+    if (lastWeatherUpdate > settings.updated) {
+      settings.updated = lastWeatherUpdate;
     }
-    setInterval(() => {
-      if (!waiting && NRF.getSecurityStatus().connected){
-        waiting = true;
-        require("owmweather").pull(completion);
+
+    let MillisUntilDue = nextDueDate() - Date.now();
+    if (MillisUntilDue <= 0) {
+      if (!loading) {
+        loading = true;
+        require("owmweather").pull(onCompleted);
       }
-    }, settings.refresh * 1000 * 60);
+    } else {
+      // called to early, reschedule
+      // console.log('Weather data is not due yet, rescheduling in ' + MillisUntilDue|0 + 'ms');
+      if (timeoutRef) clearTimeout(timeoutRef);
+      timeoutRef = setTimeout(loadIfDueAndReschedule, MillisUntilDue + 1);
+    }
   }
-}
+
+  if (settings.enabled) {
+    setTimeout(loadIfDueAndReschedule, 5000);  // run 5 seconds after boot
+    NRF.on('connect', loadIfDueAndReschedule);  // after reconnect, fetch the weather data right away if it's due
+  }
+}

apps/owmweather/metadata.json

@@ -1,7 +1,7 @@
 { "id": "owmweather",
   "name": "OpenWeatherMap weather provider",
   "shortName":"OWM Weather",
-  "version": "0.06",
+  "version": "0.07",
   "description": "Pulls weather from OpenWeatherMap (OWM) API",
   "icon": "app.png",
   "type": "bootloader",