Merge pull request #30 from starc007/fix/cache-provider

fix: cache Provider

src/read/balance.ts

@@ -1,6 +1,5 @@
-import { Provider } from 'fuels';
 import { getAllVerifiedFuelAssets } from '../utils/assets.js';
-import { setupWallet } from '../utils/setup.js';
+import { setupWallet, ProviderInstance } from '../utils/setup.js';
 
 export type GetOwnBalanceParams = {
   symbol: string;
@@ -32,9 +31,7 @@ export type GetBalanceParams = {
 };
 
 export const getBalance = async (params: GetBalanceParams) => {
-  const provider = await Provider.create(
-    'https://mainnet.fuel.network/v1/graphql',
-  );
+  const provider = await ProviderInstance.getProvider();
 
   const allAssets = await getAllVerifiedFuelAssets();
   const asset = allAssets.find((asset) => asset.symbol === params.assetSymbol);

src/utils/setup.ts

@@ -1,10 +1,22 @@
 import { Provider, Wallet } from 'fuels';
 
-export const setupWallet = async (privateKey: string) => {
-  const provider = await Provider.create(
-    'https://mainnet.fuel.network/v1/graphql',
-  );
+export class ProviderInstance {
+  private static instance: Provider | null = null;
+  private static readonly PROVIDER_URL =
+    'https://mainnet.fuel.network/v1/graphql';
+
+  private constructor() {} // Prevent direct construction
 
+  public static async getProvider(): Promise<Provider> {
+    if (!ProviderInstance.instance) {
+      ProviderInstance.instance = await Provider.create(this.PROVIDER_URL);
+    }
+    return ProviderInstance.instance;
+  }
+}
+
+export const setupWallet = async (privateKey: string) => {
+  const provider = await ProviderInstance.getProvider();
   const wallet = Wallet.fromPrivateKey(privateKey, provider);
 
   return {