feat(clients/weather): in-memory cache

package.json

@@ -26,6 +26,7 @@
 		"eslint": "^9.39.1",
 		"eslint-plugin-svelte": "^3.13.0",
 		"globals": "^16.5.0",
+		"node-cache": "^5.1.2",
 		"svelte": "^5.43.8",
 		"svelte-check": "^4.3.4",
 		"tailwindcss": "^4.1.17",

pnpm-lock.yaml

@@ -47,6 +47,9 @@ importers:
       globals:
         specifier: ^16.5.0
         version: 16.5.0
+      node-cache:
+        specifier: ^5.1.2
+        version: 5.1.2
       svelte:
         specifier: ^5.43.8
         version: 5.45.2
@@ -679,6 +682,10 @@ packages:
   class-variance-authority@0.7.1:
     resolution: {integrity: sha512-Ka+9Trutv7G8M6WT6SeiRWz792K5qEqIGEGzXKhAE6xOWAY6pPH8U+9IY3oCMv6kqTmLsv7Xh/2w2RigkePMsg==}
 
+  clone@2.1.2:
+    resolution: {integrity: sha512-3Pe/CF1Nn94hyhIYpjtiLhdCoEoz0DqQ+988E9gmeEdQZlojxnOb74wctFyuwWQHzqyf9X7C7MG8juUpqBJT8w==}
+    engines: {node: '>=0.8'}
+
   clsx@2.1.1:
     resolution: {integrity: sha512-eYm0QWBtUrBWZWG0d386OGAw16Z995PiOVo2B7bjWSbHedGl5e0ZWaq65kOGgUSNesEIDkB9ISbTg/JK9dhCZA==}
     engines: {node: '>=6'}
@@ -1034,6 +1041,10 @@ packages:
   natural-compare@1.4.0:
     resolution: {integrity: sha512-OWND8ei3VtNC9h7V60qff3SVobHr996CTwgxubgyQYEpg290h9J0buyECNNJexkFm5sOajh5G116RYA1c8ZMSw==}
 
+  node-cache@5.1.2:
+    resolution: {integrity: sha512-t1QzWwnk4sjLWaQAS8CHgOJ+RAfmHpxFWmc36IWTiWHQfs0w5JDMBS1b1ZxQteo0vVVuWJvIUKHDkkeK7vIGCg==}
+    engines: {node: '>= 8.0.0'}
+
   optionator@0.9.4:
     resolution: {integrity: sha512-6IpQ7mKUxRcZNLIObR0hz7lxsapSSIYNZJwXPGeF0mTVqGKFIXj1DQcMoT22S3ROcLyY/rz0PWaWZ9ayWmad9g==}
     engines: {node: '>= 0.8.0'}
@@ -1801,6 +1812,8 @@ snapshots:
     dependencies:
       clsx: 2.1.1
 
+  clone@2.1.2: {}
+
   clsx@2.1.1: {}
 
   color-convert@2.0.1:
@@ -2133,6 +2146,10 @@ snapshots:
 
   natural-compare@1.4.0: {}
 
+  node-cache@5.1.2:
+    dependencies:
+      clone: 2.1.2
+
   optionator@0.9.4:
     dependencies:
       deep-is: 0.1.4

src/lib/clients/weather.ts

@@ -1,3 +1,4 @@
+import NodeCache from "node-cache";
 import crypto from "node:crypto";
 
 /**
@@ -10,6 +11,14 @@ const USER_AGENT = 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36
  */
 const WEATHER_TOKEN_SECRET = "gravisfrontem";
 
+/**
+ * Response cache.
+ */
+const cache = new NodeCache({
+    // NOTE: 10 minutes in a seconds
+    stdTTL: 60 * 10,
+});
+
 interface YandexWeatherData {
     /**
      * Message from the server.
@@ -18,54 +27,54 @@ interface YandexWeatherData {
 
     info: {
         /**
-         * URL of the location page on Yandex Weather
+         * URL of the location page on Yandex Weather.
          **/
         url: string;
     };
 
     fact: {
         /**
-         * Current air temperature in °C
+         * Current air temperature in °C.
          **/
         temp: number;
 
         /**
-         * Water temperature in °C (may be missing)
+         * Water temperature in °C.
          **/
         temp_water?: number;
 
         /**
-         * Perceived (“feels like”) temperature in °C
+         * Perceived (“feels like”) temperature in °C.
          **/
         feels_like: number;
 
         /**
-         * Weather condition code (e.g., "clear", "rain")
+         * Weather condition code (e.g., "clear", "rain").
          **/
         condition: string;
 
         /**
-         * Wind speed in m/s
+         * Wind speed in m/s.
          **/
         wind_speed: number;
 
         /**
-         * Wind gust speed in m/s (may be missing)
+         * Wind gust speed in m/s.
          **/
         wind_gust?: number;
 
         /**
-         * Wind direction code (e.g., "nw", "s")
+         * Wind direction.
          **/
         wind_dir: string;
 
         /**
-         * Atmospheric pressure in mmHg
+         * Atmospheric pressure in mmHg.
          **/
         pressure_mm: number;
 
         /**
-         * Air humidity percentage
+         * Air humidity percentage.
          **/
         humidity: number;
     };
@@ -111,7 +120,7 @@ export interface FetchWeatherResult {
         gust?: number;
 
         /**
-         * Wind direction code.
+         * Wind direction.
          **/
         direction: string;
     };
@@ -140,6 +149,10 @@ function getWeatherHeaders() {
 }
 
 export default async function fetchWeather(lat: number, lon: number): Promise<FetchWeatherResult> {
+    const key = `${lat};${lon}`
+
+    let result: YandexWeatherData | undefined = cache.get(key);
+    if (!result) {
         const response = await fetch(
             `https://api.weather.yandex.ru/v2/informers?lat=${lat}&lon=${lon}&lang=en_US`,
             {
@@ -150,10 +163,18 @@ export default async function fetchWeather(lat: number, lon: number): Promise<Fe
             }
         );
 
-    const result: YandexWeatherData = await response.json();
+        result = await response.json();
+
+        // NOTE: to fix with typescript errors
+        if (!result) {
+            throw new Error('Result is undefined')
+        }
 
         if (!response.ok) {
-        throw new Error(`Yandex Weather API error: ${result.message}`)
+            throw new Error(result.message!)
+        }
+
+        cache.set(key, result);
     }
 
     return {