chore: embelish bridge and invest example

Author: lgalende

examples/12-bridge-and-invest-aave/src/bridge.ts

@@ -20,14 +20,15 @@ export default function main(): void {
   if (sourceChain == destinationChain) throw new Error('Single-chain swap not supported')
 
   const tokenIn = getUsdc(sourceChain)
-  const tokenOut = getUsdc(destinationChain)
-
   const tokenAmountIn = TokenAmount.fromStringDecimal(tokenIn, inputs.amount)
+
+  const tokenOut = getUsdc(destinationChain)
   const tokenAmountOut = TokenAmount.fromStringDecimal(tokenOut, inputs.minAmountOut)
 
   const feeToken = new ERC20Token(inputs.feeToken, inputs.destinationChain)
   const maxFee = TokenAmount.fromStringDecimal(feeToken, inputs.maxFee)
 
+  // Set topic hash and encode tokenOut address as extra data
   const topic = evm.keccak('Bridged USDC')
   const data = evm.encode([EvmEncodeParam.fromValue('address', tokenAmountOut.token.address)])
 

examples/12-bridge-and-invest-aave/src/create-config.invest.ts

@@ -47,7 +47,7 @@ async function main() {
     type: TriggerType.Event as const,
     contract: MIMIC_PROTOCOL_SETTLER,
     topics: [
-      [INTENT_EXECUTED_TOPIC],
+      [INTENT_EXECUTED_TOPIC], // The event emitted by the Settler
       [USER_TOPIC], // Important: To prevent other users from triggering this task
       [BRIDGED_TOPIC], // Emitted by the bridge task
     ],

examples/12-bridge-and-invest-aave/src/invest.ts

@@ -33,17 +33,19 @@ export default function main(): void {
   // Get the token and the amount from the event emitted by the task that triggered this one
   const tokenStr = evm.decode(new EvmDecodeParam('address', event.data.toHexString()))
   const token = Address.fromString(tokenStr)
-  const output = evm.decode(new EvmDecodeParam('uint256[]', event.output.toHexString()))
-  const amountsOut = JSON.parse<string[]>(output)
-  const amount = BigInt.fromString(amountsOut[0])
+
+  const amountsStr = evm.decode(new EvmDecodeParam('uint256[]', event.output.toHexString()))
+  const amounts = JSON.parse<string[]>(amountsStr)
+  if (amounts.length == 0) throw new Error('Empty amounts array')
+  const amount = BigInt.fromString(amounts[0])
 
   const feeToken = new ERC20Token(inputs.feeToken, chainId)
   const maxFee = TokenAmount.fromStringDecimal(feeToken, inputs.maxFee)
 
   const approveData = ERC20Utils.encodeApprove(aaveV3Pool, amount)
   const supplyData = AavePoolUtils.encodeSupply(token, amount, smartAccount, 0)
 
-  // Deposit USDC owned by the smart account
+  // Give approval and deposit the tokens, owned by the smart account
   EvmCallBuilder.forChain(chainId)
     .addCall(token, approveData)
     .addCall(aaveV3Pool, supplyData)