fix(ethexe): fix WVara decimals; retrieve 10 WVara default exec balan…

…ce on creation (#4329)

.github/workflows/check.yml

@@ -34,7 +34,7 @@ jobs:
       - name: "Install: Node.js"
         uses: actions/setup-node@v4
         with:
-          node-version: 20.x
+          node-version: 22.x
 
       - name: "Show: Versioning"
         run: |

ethexe/cli/src/tests.rs

@@ -359,6 +359,9 @@ async fn incoming_transfers() {
     let ping_id = res.program_id;
 
     let wvara = env.ethereum.router().wvara();
+
+    assert_eq!(wvara.query().decimals().await.unwrap(), 12);
+
     let ping = env.ethereum.mirror(ping_id.to_address_lossy().into());
 
     let on_eth_balance = wvara

ethexe/contracts/src/Router.sol

@@ -11,6 +11,7 @@ import {IRouter} from "./IRouter.sol";
 import {IMirror} from "./IMirror.sol";
 import {IWrappedVara} from "./IWrappedVara.sol";
 import {IERC20} from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
+import {IERC20Metadata} from "@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol";
 
 contract Router is IRouter, OwnableUpgradeable, ReentrancyGuardTransient {
     using ECDSA for bytes32;
@@ -297,7 +298,9 @@ contract Router is IRouter, OwnableUpgradeable, ReentrancyGuardTransient {
         require(router.codes[codeId] == CodeState.Validated, "code must be validated before program creation");
 
         uint128 baseFeeValue = baseFee();
-        uint128 executableBalance = baseFeeValue * 10;
+
+        // By default get 10 WVara for executable balance.
+        uint128 executableBalance = uint128(10 ** IERC20Metadata(router.wrappedVara).decimals());
 
         uint128 totalValue = baseFeeValue + executableBalance + _value;
 

ethexe/contracts/src/WrappedVara.sol

@@ -36,6 +36,10 @@ contract WrappedVara is
 
     function reinitialize() public onlyOwner reinitializer(2) {}
 
+    function decimals() public pure override returns (uint8) {
+        return 12;
+    }
+
     function mint(address to, uint256 amount) public onlyOwner {
         _mint(to, amount);
     }

ethexe/ethereum/src/wvara/mod.rs

@@ -104,6 +104,15 @@ impl WVaraQuery {
         )))
     }
 
+    pub async fn decimals(&self) -> Result<u8> {
+        self.0
+            .decimals()
+            .call()
+            .await
+            .map(|res| res._0)
+            .map_err(Into::into)
+    }
+
     pub async fn total_supply(&self) -> Result<u128> {
         self.0
             .totalSupply()