fix: catch service errors

package.json

@@ -1,6 +1,6 @@
 {
   "name": "pool-relayer",
-  "version": "0.0.1",
+  "version": "0.0.2",
   "description": "Relayer for Tornado.cash Nova privacy solution. https://tornado.cash",
   "author": "tornado.cash",
   "license": "MIT",

src/constants/variables.ts

@@ -47,3 +47,9 @@ export const CONTRACT_ERRORS = [
   'Invalid transaction proof',
   "Can't withdraw to zero address",
 ];
+
+export const SERVICE_ERRORS = {
+  GAS_PRICE: 'Could not get gas price',
+  TOKEN_RATES: 'Could not get token rates',
+  GAS_SPIKE: 'Provided fee is not enough. Probably it is a Gas Price spike, try to resubmit.',
+};

src/modules/queue/transaction.processor.ts

@@ -7,8 +7,8 @@ import { ConfigService } from '@nestjs/config';
 import { InjectQueue, Process, Processor, OnQueueActive, OnQueueCompleted, OnQueueFailed } from '@nestjs/bull';
 
 import { Transaction } from '@/types';
-import { CONTRACT_ERRORS, jobStatus } from '@/constants';
 import { getToIntegerMultiplier, toWei } from '@/utilities';
+import { CONTRACT_ERRORS, SERVICE_ERRORS, jobStatus } from '@/constants';
 import { GasPriceService, ProviderService, OffchainPriceService } from '@/services';
 
 import txMangerConfig from '@/config/txManager.config';
@@ -131,28 +131,38 @@ export class TransactionProcessor extends BaseProcessor<Transaction> {
   }
 
   async checkFee({ fee, externalAmount }) {
-    const { gasLimit } = this.configService.get('base');
-    const { fast } = await this.gasPriceService.getGasPrice();
+    try {
+      const { gasLimit } = this.configService.get('base');
+      const { fast } = await this.gasPriceService.getGasPrice();
 
-    const operationFee = BigNumber.from(fast).mul(gasLimit);
+      const operationFee = BigNumber.from(fast).mul(gasLimit);
 
-    const feePercent = this.getServiceFee(externalAmount);
+      const feePercent = this.getServiceFee(externalAmount);
 
-    const ethPrice = await this.offChainPriceService.getDaiEthPrice();
+      const ethPrice = await this.offChainPriceService.getDaiEthPrice();
 
-    const expense = operationFee.mul(ethPrice).div(toWei('1'));
-    const desiredFee = expense.add(feePercent);
+      const expense = operationFee.mul(ethPrice).div(toWei('1'));
+      const desiredFee = expense.add(feePercent);
 
-    if (BigNumber.from(fee).lt(desiredFee)) {
-      throw new Error('Provided fee is not enough. Probably it is a Gas Price spike, try to resubmit.');
+      if (BigNumber.from(fee).lt(desiredFee)) {
+        throw new Error(SERVICE_ERRORS.GAS_SPIKE);
+      }
+    } catch (err) {
+      this.handleError(err);
     }
   }
 
   handleError({ message }: Error) {
-    const error = CONTRACT_ERRORS.find((knownError) => message.includes(knownError));
+    const contractError = CONTRACT_ERRORS.find((knownError) => message.includes(knownError));
 
-    if (error) {
-      throw new Error(`Revert by smart contract: ${error}`);
+    if (contractError) {
+      throw new Error(`Revert by smart contract: ${contractError}`);
+    }
+
+    const serviceError = Object.values(SERVICE_ERRORS).find((knownError) => message.includes(knownError));
+
+    if (serviceError) {
+      throw new Error(`Relayer internal error: ${serviceError}`);
     }
 
     console.log('handleError:', message);

src/services/gas-price.service.ts

@@ -5,6 +5,7 @@ import { BigNumber } from 'ethers';
 import { GasPriceOracle } from 'gas-price-oracle';
 
 import { toWei } from '@/utilities';
+import { SERVICE_ERRORS } from '@/constants';
 
 const bump = (gas: BigNumber, percent: number) => gas.mul(percent).div(100).toHexString();
 const gweiToWei = (value: number) => toWei(String(value), 'gwei');
@@ -27,18 +28,23 @@ export class GasPriceService {
   }
 
   async getGasPrice() {
-    const instance = new GasPriceOracle({
-      chainId: this.chainId,
-      defaultRpc: this.rpcUrl,
-    });
+    try {
+      const instance = new GasPriceOracle({
+        chainId: this.chainId,
+        defaultRpc: this.rpcUrl,
+      });
 
-    const result = await instance.gasPrices();
+      const result = await instance.gasPrices();
 
-    return {
-      instant: bump(gweiToWei(result.instant), percentBump.INSTANT),
-      fast: bump(gweiToWei(result.instant), percentBump.FAST),
-      standard: bump(gweiToWei(result.standard), percentBump.STANDARD),
-      low: bump(gweiToWei(result.low), percentBump.LOW),
-    };
+      return {
+        instant: bump(gweiToWei(result.instant), percentBump.INSTANT),
+        fast: bump(gweiToWei(result.instant), percentBump.FAST),
+        standard: bump(gweiToWei(result.standard), percentBump.STANDARD),
+        low: bump(gweiToWei(result.low), percentBump.LOW),
+      };
+    } catch (err) {
+      console.log('getGasPrice has error:', err.message);
+      throw new Error(SERVICE_ERRORS.GAS_PRICE);
+    }
   }
 }

src/services/offchain-price.service.ts

@@ -4,10 +4,9 @@ import { ConfigService } from '@nestjs/config';
 import { BigNumber } from 'ethers';
 
 import { ChainId } from '@/types';
-import { DAI_ADDRESS } from '@/constants';
-import { ProviderService } from '@/services';
 import { toWei } from '@/utilities';
-
+import { ProviderService } from '@/services';
+import { DAI_ADDRESS, SERVICE_ERRORS } from '@/constants';
 @Injectable()
 export class OffchainPriceService {
   private readonly chainId: number;
@@ -19,14 +18,19 @@ export class OffchainPriceService {
   }
 
   async getDaiEthPrice() {
-    const contract = this.providerService.getOffChainOracle();
+    try {
+      const contract = this.providerService.getOffChainOracle();
 
-    const rate = await contract.callStatic.getRateToEth(DAI_ADDRESS, false);
+      const rate = await contract.callStatic.getRateToEth(DAI_ADDRESS, false);
 
-    const numerator = BigNumber.from(toWei('1'));
-    const denominator = BigNumber.from(toWei('1'));
+      const numerator = BigNumber.from(toWei('1'));
+      const denominator = BigNumber.from(toWei('1'));
 
-    // price = rate * "token decimals" / "eth decimals" (dai = eth decimals)
-    return BigNumber.from(rate).mul(numerator).div(denominator);
+      // price = rate * "token decimals" / "eth decimals" (dai = eth decimals)
+      return BigNumber.from(rate).mul(numerator).div(denominator);
+    } catch (err) {
+      console.log('getDaiEthPrice has error:', err.message);
+      throw new Error(SERVICE_ERRORS.TOKEN_RATES);
+    }
   }
 }