module: added exponential backoff on axios

- "exponential backoff" is a strategy for handling transient failures
in distributed systems with retries "5" times and retry delay adjustment.

- if string coingecko is empty then value is "null" and makes
the public limitation on api the looping exceptions.

Signed-off-by: Salman Wahib <sxlmnwb.dev@gmail.com>

package.json

@@ -9,6 +9,7 @@
     "author": "sxlmnwb",
     "dependencies": {
         "axios": "^1.4.0",
+        "axios-retry": "^3.6.0",
         "chalk": "^4.1.2",
         "dotenv": "^16.3.1",
         "is-root": "^3.0.0",

src/libs/getApi.js

@@ -1,12 +1,17 @@
 const axios = require('axios');
+const axiosRetry = require('axios-retry');
+
+axiosRetry(axios, { retries: 5, retryDelay: axiosRetry.exponentialDelay });
 
 module.exports = async function getApiData({ apiUrl, coingecko, valoper, valcons }) {
   const summaryApi = await axios.get(`${apiUrl}/cosmos/base/tendermint/v1beta1/blocks/latest`);
 
   let coingeckoApi;
     try {
+        // https://api.coingecko.com/api/v3/coins/${coingecko}
         coingeckoApi = await axios.get(`https://api.coingecko.com/api/v3/simple/price?ids=${coingecko}&vs_currencies=usd`);
     } catch (error) {
+        coingeckoApi = null;
       if (error.response && error.response.status === 429) {
       } else {
         throw error;

src/libs/useApi.js

@@ -17,12 +17,17 @@ module.exports = async function useApi({ apiUrl, valoper, valcons, denom, expone
     const secondsAgo = Math.round((fetchedAt - latestBlockTime) / 1000);
 
     let tokenPrice = ' -';
-    if (coingecko !== "") {
-    tokenPrice = apiData.coingeckoApi.data[coingecko].usd;
-    if (tokenPrice >= 1) {
-        tokenPrice = tokenPrice.toLocaleString('en-US', {minimumFractionDigits: 2, maximumFractionDigits: 2});
+
+    if (apiData.coingeckoApi) {
+      if (apiData.coingeckoApi.data[coingecko]) {
+    if (coingecko !== null) {
+        tokenPrice = apiData.coingeckoApi.data[coingecko].usd;
+        if (tokenPrice >= 1) {
+            tokenPrice = tokenPrice.toLocaleString('en-US', {minimumFractionDigits: 2, maximumFractionDigits: 2});
+          }
         }
-    }    
+      }
+    }
 
     // summary