Upgrade to Solidity 0.8.22 (#992)

* Upgrade to Solidity 0.8.22
* Update foundry to support Solidity 0.8.22
* Update bindings for Gateway.sol
* Smokestests now require serde

contracts/foundry.toml

@@ -1,5 +1,5 @@
 [profile.default]
-solc_version = "0.8.20"
+solc_version = "0.8.22"
 optimizer = true
 optimizer_runs = 20_000
 via_ir = true

contracts/src/Agent.sol

@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: Apache-2.0
 // SPDX-FileCopyrightText: 2023 Snowfork <[email protected]>
-pragma solidity 0.8.20;
+pragma solidity 0.8.22;
 
 /// @title An agent contract that acts on behalf of a consensus system on Polkadot
 /// @dev Instances of this contract act as an agents for arbitrary consensus systems on Polkadot. These consensus systems

contracts/src/AgentExecutor.sol

@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: Apache-2.0
 // SPDX-FileCopyrightText: 2023 Snowfork <[email protected]>
-pragma solidity 0.8.20;
+pragma solidity 0.8.22;
 
 import {AgentExecuteCommand, ParaID} from "./Types.sol";
 import {SubstrateTypes} from "./SubstrateTypes.sol";

contracts/src/Assets.sol

@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: Apache-2.0
 // SPDX-FileCopyrightText: 2023 Snowfork <[email protected]>
-pragma solidity 0.8.20;
+pragma solidity 0.8.22;
 
 import {IERC20} from "./interfaces/IERC20.sol";
 import {IGateway} from "./interfaces/IGateway.sol";
@@ -17,12 +17,6 @@ library Assets {
     using Address for address;
     using SafeTokenTransferFrom for IERC20;
 
-    /// @dev Emitted once the funds are locked and a message is successfully queued.
-    event TokenSent(
-        address indexed token, address indexed sender, ParaID destinationChain, bytes destinationAddress, uint128 amount
-    );
-    event TokenRegistrationSent(address token);
-
     /* Errors */
     error InvalidToken();
     error InvalidAmount();
@@ -55,7 +49,7 @@ library Assets {
         }
         extraFee = $.sendTokenFee;
 
-        emit TokenSent(sender, token, destinationChain, abi.encodePacked(destinationAddress), amount);
+        emit IGateway.TokenSent(sender, token, destinationChain, abi.encodePacked(destinationAddress), amount);
     }
 
     function sendToken(
@@ -77,7 +71,7 @@ library Assets {
 
         payload = SubstrateTypes.SendToken(address(this), token, destinationChain, destinationAddress, amount);
         extraFee = $.sendTokenFee;
-        emit TokenSent(sender, token, destinationChain, abi.encodePacked(destinationAddress), amount);
+        emit IGateway.TokenSent(sender, token, destinationChain, abi.encodePacked(destinationAddress), amount);
     }
 
     /// @dev transfer tokens from the sender to the specified
@@ -105,6 +99,6 @@ library Assets {
         payload = SubstrateTypes.RegisterToken(token);
         extraFee = $.registerTokenFee;
 
-        emit TokenRegistrationSent(token);
+        emit IGateway.TokenRegistrationSent(token);
     }
 }

contracts/src/BeefyClient.sol

@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: Apache-2.0
 // SPDX-FileCopyrightText: 2023 Snowfork <[email protected]>
-pragma solidity 0.8.20;
+pragma solidity 0.8.22;
 
 import {ECDSA} from "openzeppelin/utils/cryptography/ECDSA.sol";
 import {SubstrateMerkleProof} from "./utils/SubstrateMerkleProof.sol";

contracts/src/DeployScript.sol

@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: Apache-2.0
 // SPDX-FileCopyrightText: 2023 Snowfork <[email protected]>
-pragma solidity 0.8.20;
+pragma solidity 0.8.22;
 
 import {WETH9} from "canonical-weth/WETH9.sol";
 import {Script} from "forge-std/Script.sol";

contracts/src/FundAgent.sol

@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: Apache-2.0
 // SPDX-FileCopyrightText: 2023 Snowfork <[email protected]>
-pragma solidity 0.8.20;
+pragma solidity 0.8.22;
 
 import {WETH9} from "canonical-weth/WETH9.sol";
 import {Script} from "forge-std/Script.sol";

contracts/src/Gateway.sol

@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: Apache-2.0
 // SPDX-FileCopyrightText: 2023 Snowfork <[email protected]>
-pragma solidity 0.8.20;
+pragma solidity 0.8.22;
 
 import {MerkleProof} from "openzeppelin/utils/cryptography/MerkleProof.sol";
 import {Verification} from "./Verification.sol";

contracts/src/GatewayProxy.sol

@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: Apache-2.0
 // SPDX-FileCopyrightText: 2023 Snowfork <[email protected]>
-pragma solidity 0.8.20;
+pragma solidity 0.8.22;
 
 import {ERC1967} from "./utils/ERC1967.sol";
 import {IInitializable} from "./interfaces/IInitializable.sol";

contracts/src/SubstrateTypes.sol

@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: Apache-2.0
 // SPDX-FileCopyrightText: 2023 Snowfork <[email protected]>
-pragma solidity 0.8.20;
+pragma solidity 0.8.22;
 
 import {ScaleCodec} from "./utils/ScaleCodec.sol";
 import {ParaID} from "./Types.sol";

contracts/src/Types.sol

@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: Apache-2.0
 // SPDX-FileCopyrightText: 2023 Snowfork <[email protected]>
-pragma solidity 0.8.20;
+pragma solidity 0.8.22;
 
 type ParaID is uint256;
 

contracts/src/Verification.sol

@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: Apache-2.0
 // SPDX-FileCopyrightText: 2023 Snowfork <[email protected]>
-pragma solidity 0.8.20;
+pragma solidity 0.8.22;
 
 import {SubstrateMerkleProof} from "./utils/SubstrateMerkleProof.sol";
 import {BeefyClient} from "./BeefyClient.sol";

contracts/src/interfaces/IERC20.sol

@@ -1,7 +1,7 @@
 // SPDX-License-Identifier: MIT
 // SPDX-FileCopyrightText: 2023 Axelar Network
 
-pragma solidity ^0.8.20;
+pragma solidity 0.8.22;
 
 /**
  * @dev Interface of the ERC20 standard as defined in the EIP.

contracts/src/interfaces/IGateway.sol

@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: Apache-2.0
 // SPDX-FileCopyrightText: 2023 Snowfork <[email protected]>
-pragma solidity 0.8.20;
+pragma solidity 0.8.22;
 
 import {OperatingMode, InboundMessage, ParaID} from "../Types.sol";
 import {Verification} from "../Verification.sol";
@@ -34,6 +34,12 @@ interface IGateway {
     // Emitted when funds are withdrawn from an agent
     event AgentFundsWithdrawn(bytes32 indexed agentID, address indexed recipient, uint256 amount);
 
+    /// @dev Emitted once the funds are locked and a message is successfully queued.
+    event TokenSent(
+        address indexed token, address indexed sender, ParaID destinationChain, bytes destinationAddress, uint128 amount
+    );
+    event TokenRegistrationSent(address token);
+
     /**
      * Getters
      */

contracts/src/interfaces/IInitializable.sol

@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: Apache-2.0
 // SPDX-FileCopyrightText: 2023 Snowfork <[email protected]>
-pragma solidity 0.8.20;
+pragma solidity 0.8.22;
 
 /**
  * @title Initialization of gateway contracts

contracts/src/storage/AssetsStorage.sol

@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: Apache-2.0
 // SPDX-FileCopyrightText: 2023 Snowfork <[email protected]>
-pragma solidity 0.8.20;
+pragma solidity 0.8.22;
 
 library AssetsStorage {
     struct Layout {

contracts/src/storage/CoreStorage.sol

@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: Apache-2.0
 // SPDX-FileCopyrightText: 2023 Snowfork <[email protected]>
-pragma solidity 0.8.20;
+pragma solidity 0.8.22;
 
 import {Channel, OperatingMode, ParaID} from "../Types.sol";
 

contracts/src/utils/Address.sol

@@ -2,7 +2,7 @@
 // SPDX-FileCopyrightText: 2023 Axelar Network
 // SPDX-FileCopyrightText: 2023 Snowfork <[email protected]>
 
-pragma solidity ^0.8.20;
+pragma solidity 0.8.22;
 
 library Address {
     // Checks whether `account` is a contract

contracts/src/utils/Bitfield.sol

@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: Apache-2.0
 // SPDX-FileCopyrightText: 2023 Snowfork <[email protected]>
-pragma solidity 0.8.20;
+pragma solidity 0.8.22;
 
 import {Bits} from "./Bits.sol";
 

contracts/src/utils/Bits.sol

@@ -1,7 +1,7 @@
 // SPDX-License-Identifier: Apache-2.0
 // SPDX-FileCopyrightText: 2023 Snowfork <[email protected]>
 // Code from https://github.com/ethereum/solidity-examples
-pragma solidity 0.8.20;
+pragma solidity 0.8.22;
 
 library Bits {
     uint256 internal constant ONE = uint256(1);

contracts/src/utils/Call.sol

@@ -1,7 +1,7 @@
 // SPDX-License-Identifier: MIT
 // SPDX-FileCopyrightText: 2023 OpenZeppelin
 // SPDX-FileCopyrightText: 2023 Snowfork <[email protected]>
-pragma solidity 0.8.20;
+pragma solidity 0.8.22;
 
 // Derived from OpenZeppelin Contracts (last updated v4.9.0) (utils/Address.sol)
 library Call {

contracts/src/utils/Counter.sol

@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: Apache-2.0
 // SPDX-FileCopyrightText: 2023 Snowfork <[email protected]>
-pragma solidity 0.8.20;
+pragma solidity 0.8.22;
 
 /**
  * @title A utility library for 16 bit counters packed in 256 bit array.

contracts/src/utils/ERC1967.sol

@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: Apache-2.0
 // SPDX-FileCopyrightText: 2023 Snowfork <[email protected]>
-pragma solidity 0.8.20;
+pragma solidity 0.8.22;
 
 /// @title Minimal implementation of ERC1967 storage slot
 library ERC1967 {

contracts/src/utils/MMRProof.sol

@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: Apache-2.0
 // SPDX-FileCopyrightText: 2023 Snowfork <[email protected]>
-pragma solidity 0.8.20;
+pragma solidity 0.8.22;
 
 library MMRProof {
     error ProofSizeExceeded();

contracts/src/utils/Math.sol

@@ -2,7 +2,7 @@
 // SPDX-FileCopyrightText: 2023 OpenZeppelin
 // SPDX-FileCopyrightText: 2023 Snowfork <[email protected]>
 // Code from https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/utils/math/Math.sol
-pragma solidity ^0.8.20;
+pragma solidity 0.8.22;
 
 /**
  * @dev Standard math utilities missing in the Solidity language.

contracts/src/utils/SafeTransfer.sol

@@ -2,7 +2,7 @@
 // SPDX-FileCopyrightText: 2023 Axelar Network
 // SPDX-FileCopyrightText: 2023 Snowfork <[email protected]>
 
-pragma solidity ^0.8.20;
+pragma solidity 0.8.22;
 
 import {IERC20} from "../interfaces/IERC20.sol";
 

contracts/src/utils/ScaleCodec.sol

@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: Apache-2.0
 // SPDX-FileCopyrightText: 2023 Snowfork <[email protected]>
-pragma solidity 0.8.20;
+pragma solidity 0.8.22;
 
 library ScaleCodec {
     error UnsupportedCompactEncoding();

contracts/src/utils/SubstrateMerkleProof.sol

@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: Apache-2.0
 // SPDX-FileCopyrightText: 2023 Snowfork <[email protected]>
-pragma solidity 0.8.20;
+pragma solidity 0.8.22;
 
 // Used to verify merkle proofs generated by https://github.com/paritytech/substrate/tree/master/utils/binary-merkle-tree
 library SubstrateMerkleProof {

contracts/test/Agent.t.sol

@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: Apache-2.0
-pragma solidity ^0.8.20;
+pragma solidity 0.8.22;
 
 import "forge-std/Test.sol";
 import "forge-std/console.sol";

contracts/test/BeefyClient.t.sol

@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: Apache-2.0
-pragma solidity ^0.8.20;
+pragma solidity 0.8.22;
 
 import {Strings} from "openzeppelin/utils/Strings.sol";
 import {Test} from "forge-std/Test.sol";

contracts/test/Counter.t.sol

@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: Apache-2.0
-pragma solidity ^0.8.20;
+pragma solidity 0.8.22;
 
 import "forge-std/Test.sol";
 import "forge-std/console.sol";