v3.7.0: adds local caching (for 24h)

DePayFi · Oct 9, 2023 · 6edc497 · 6edc497
1 parent c1aa3eb
commit 6edc497
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Showing 4 changed files with 67 additions and 10 deletions.
diff --git a/dist/esm/index.js b/dist/esm/index.js
@@ -436,6 +436,14 @@ class Currency {
     return window._LocalCurrencyCode || timezoneToCurrency[timeZone || Currency.timeZone()] || 'USD'
   }
 
+  static getCacheKey(currency) {
+    const now = new Date();
+    const year = now.getUTCFullYear();
+    const month = now.getUTCMonth();
+    const day = now.getUTCDate();
+    return `@depay/local-currency/v3.6.1/rates/${currency}/${year}-${month}-${day}`
+  }
+
   static async rate({ from, to }) {
     if(to == undefined) { to = Currency.getCode(); }
     let fromToUsd = await Currency.fromUSD({ amount: 1, code: from });
@@ -448,13 +456,24 @@ class Currency {
 
   static async fromUSD({ amount, code, timeZone }) {
     let currency = new Currency({ amount, code, timeZone });
-    let rate = await fetch('https://public.depay.com/currencies/' + currency.code)
+    const cacheKey = Currency.getCacheKey(currency.code);
+    let cachedValue = localStorage.getItem(cacheKey);
+    let rate;
+    if(cachedValue) {
+      rate = cachedValue; 
+    } else {
+      rate = await fetch('https://public.depay.com/currencies/' + currency.code)
       .then((response) => response.json())
-      .then((data) => parseFloat(data))
-      .catch(()=>{
+      .then((data) => {
+        let value = parseFloat(data);
+        localStorage.setItem(cacheKey, value);
+        return value
+      })
+      .catch((e)=>{
         currency.code = "USD";
         return 1
       });
+    }
     currency.amount = currency.amount * rate;
     return currency
   }

diff --git a/dist/umd/index.js b/dist/umd/index.js
@@ -442,6 +442,14 @@
       return window._LocalCurrencyCode || timezoneToCurrency[timeZone || Currency.timeZone()] || 'USD'
     }
 
+    static getCacheKey(currency) {
+      const now = new Date();
+      const year = now.getUTCFullYear();
+      const month = now.getUTCMonth();
+      const day = now.getUTCDate();
+      return `@depay/local-currency/v3.6.1/rates/${currency}/${year}-${month}-${day}`
+    }
+
     static async rate({ from, to }) {
       if(to == undefined) { to = Currency.getCode(); }
       let fromToUsd = await Currency.fromUSD({ amount: 1, code: from });
@@ -454,13 +462,24 @@
 
     static async fromUSD({ amount, code, timeZone }) {
       let currency = new Currency({ amount, code, timeZone });
-      let rate = await fetch('https://public.depay.com/currencies/' + currency.code)
+      const cacheKey = Currency.getCacheKey(currency.code);
+      let cachedValue = localStorage.getItem(cacheKey);
+      let rate;
+      if(cachedValue) {
+        rate = cachedValue; 
+      } else {
+        rate = await fetch('https://public.depay.com/currencies/' + currency.code)
         .then((response) => response.json())
-        .then((data) => parseFloat(data))
-        .catch(()=>{
+        .then((data) => {
+          let value = parseFloat(data);
+          localStorage.setItem(cacheKey, value);
+          return value
+        })
+        .catch((e)=>{
           currency.code = "USD";
           return 1
         });
+      }
       currency.amount = currency.amount * rate;
       return currency
     }

diff --git a/package.json b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "@depay/local-currency",
   "moduleName": "LocalCurrency",
-  "version": "3.6.1",
+  "version": "3.7.0",
   "description": "JavaScript library that detects user's local currency and provides functionalities to convert between multiple currencies.",
   "main": "dist/umd/index.js",
   "module": "dist/esm/index.js",

diff --git a/src/Currency.js b/src/Currency.js
@@ -11,6 +11,14 @@ class Currency {
     return window._LocalCurrencyCode || timezoneToCurrency[timeZone || Currency.timeZone()] || 'USD'
   }
 
+  static getCacheKey(currency) {
+    const now = new Date()
+    const year = now.getUTCFullYear()
+    const month = now.getUTCMonth()
+    const day = now.getUTCDate()
+    return `@depay/local-currency/v3.6.1/rates/${currency}/${year}-${month}-${day}`
+  }
+
   static async rate({ from, to }) {
     if(to == undefined) { to = Currency.getCode() }
     let fromToUsd = await Currency.fromUSD({ amount: 1, code: from })
@@ -23,13 +31,24 @@ class Currency {
 
   static async fromUSD({ amount, code, timeZone }) {
     let currency = new Currency({ amount, code, timeZone })
-    let rate = await fetch('https://public.depay.com/currencies/' + currency.code)
+    const cacheKey = Currency.getCacheKey(currency.code)
+    let cachedValue = localStorage.getItem(cacheKey)
+    let rate
+    if(cachedValue) {
+      rate = cachedValue 
+    } else {
+      rate = await fetch('https://public.depay.com/currencies/' + currency.code)
       .then((response) => response.json())
-      .then((data) => parseFloat(data))
-      .catch(()=>{
+      .then((data) => {
+        let value = parseFloat(data)
+        localStorage.setItem(cacheKey, value)
+        return value
+      })
+      .catch((e)=>{
         currency.code = "USD"
         return 1
       })
+    }
     currency.amount = currency.amount * rate
     return currency
   }