fix: add fallback logic for fee caching

Author: jvsena42

src/store/index.ts

@@ -34,7 +34,7 @@ const persistConfig = {
 	// increase version after store shape changes
 	version: 54,
 	stateReconciler: autoMergeLevel2,
-	blacklist: ['receive', 'ui', 'fees'],
+	blacklist: ['receive', 'ui'],
 	migrate: createMigrate(migrations, { debug: __ENABLE_MIGRATION_DEBUG__ }),
 };
 

src/utils/lightning/index.ts

@@ -318,32 +318,51 @@ export const getFees: TGetFees = async () => {
 	} else if (getSelectedNetwork() !== 'bitcoin') {
 		fees = initialFeesState.onchain;
 	} else {
-		fees = await new Promise<IOnchainFees>((resolve, reject) => {
-			// try twice
-			const mpPromise = Promise.race([
-				fetchMp().catch(fetchMp),
-				throwTimeout(10000),
-			]);
-			const btPromise = Promise.race([
-				fetchBt().catch(fetchBt),
-				throwTimeout(10000),
-			]).catch(() => null); // Prevent unhandled rejection
-
-			// prioritize mempool.space over blocktank
-			mpPromise.then(resolve).catch(() => {
-				btPromise
-					.then((btFees) => {
-						if (btFees !== null) {
-							resolve(btFees);
-						} else {
-							reject(new Error('Failed to fetch fees'));
-						}
-					})
-					.catch(reject);
+		try {
+			fees = await new Promise<IOnchainFees>((resolve, reject) => {
+				// try twice
+				const mpPromise = Promise.race([
+					fetchMp().catch(fetchMp),
+					throwTimeout(10000),
+				]);
+				const btPromise = Promise.race([
+					fetchBt().catch(fetchBt),
+					throwTimeout(10000),
+				]).catch(() => null); // Prevent unhandled rejection
+
+				// prioritize mempool.space over blocktank
+				mpPromise.then(resolve).catch(() => {
+					btPromise
+						.then((btFees) => {
+							if (btFees !== null) {
+								resolve(btFees);
+							} else {
+								reject(new Error('Failed to fetch fees'));
+							}
+						})
+						.catch(reject);
+				});
 			});
-		});
 
-		updateOnchainFeeEstimates({ feeEstimates: fees });
+			updateOnchainFeeEstimates({ feeEstimates: fees });
+		} catch (error) {
+			// FALLBACK: Use cached fees if network fetch fails
+			const cachedFees = getFeesStore().onchain;
+			const feeAge = Date.now() - cachedFees.timestamp;
+			const MAX_FEE_AGE = 60 * 60 * 1000; // 1 hour
+
+			if (feeAge < MAX_FEE_AGE) {
+				console.warn(
+					`getFees: Network fetch failed, using cached fees (age: ${Math.round(feeAge / 1000 / 60)} minutes)`,
+				);
+				fees = cachedFees;
+			} else {
+				console.warn(
+					`getFees: Network fetch failed and cached fees too old (age: ${Math.round(feeAge / 1000 / 60)} minutes), using initial state`,
+				);
+				fees = initialFeesState.onchain;
+			}
+		}
 	}
 
 	return {