feat(adapter): Add RGT to Tribe migration adapter [SIM-52] (#188)

* add RGT to Tribe migration adapter

contracts/mocks/external/TribePegExchangerMock.sol

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+/*
+    Copyright 2021 Set Labs Inc.
+
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+
+    SPDX-License-Identifier: Apache License, Version 2.0
+*/
+
+pragma solidity 0.6.10;
+
+import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
+import { SafeERC20 } from "@openzeppelin/contracts/token/ERC20/SafeERC20.sol";
+
+/**
+  * @title Contract to exchange RGT with TRIBE post-merger
+  */
+contract TribePegExchangerMock {
+    using SafeERC20 for IERC20;
+
+    /// @notice the multiplier applied to RGT before converting to TRIBE scaled up by 1e9
+    uint256 public constant exchangeRate = 26705673430; // 26.7 TRIBE / RGT
+    /// @notice the granularity of the exchange rate
+    uint256 public constant scalar = 1e9;
+
+    event Exchange(address indexed from, uint256 amountIn, uint256 amountOut);
+
+    address public immutable rgt;
+    address public immutable tribe;
+
+    constructor(address _rgt, address _tribe) public {
+        rgt = _rgt;
+        tribe = _tribe;
+    }
+
+    /// @notice call to exchange held RGT with TRIBE
+    /// @param amount the amount to exchange
+    /// Mirrors the real contract without the permission state checks.
+    function exchange(uint256 amount) public {
+        uint256 tribeOut = amount * exchangeRate / scalar;
+        IERC20(rgt).safeTransferFrom(msg.sender, address(this), amount);
+        IERC20(tribe).safeTransfer(msg.sender, tribeOut);
+        emit Exchange(msg.sender, amount, tribeOut);
+    }
+}

contracts/protocol/integration/wrap/RgtMigrationWrapAdapter.sol

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+/*
+    Copyright 2021 Set Labs Inc.
+
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+
+    SPDX-License-Identifier: Apache License, Version 2.0
+*/
+
+pragma solidity 0.6.10;
+pragma experimental "ABIEncoderV2";
+
+/**
+  * @title RgtMigrationWrapAdater
+  * @author FlattestWhite
+  *
+  * Wrap adapter for one time token migration that returns data for wrapping RGT into TRIBE. 
+  * Note: RGT can not be unwrapped into TRIBE, because migration can not be reversed.
+ */
+contract RgtMigrationWrapAdapter {
+
+    /* ============ State Variables ============ */
+
+    address public immutable pegExchanger;
+
+    /* ============ Constructor ============ */
+
+    /**
+     * Set state variables
+     *
+     * @param _pegExchanger                       Address of PegExchanger contract
+     */
+    constructor(
+        address _pegExchanger
+    )
+        public
+    {
+        pegExchanger = _pegExchanger;
+    } 
+
+    /* ============ External Getter Functions ============ */
+
+    /**
+     * Generates the calldata to migrate RGT tokens to TRIBE tokens.
+     *
+     * @param _underlyingUnits      Total quantity of underlying units to wrap
+     *
+     * @return address              Target contract address
+     * @return uint256              Total quantity of underlying units (if underlying is ETH)
+     * @return bytes                Wrap calldata
+     */
+    function getWrapCallData(
+        address /* _underlyingToken */,
+        address /* _wrappedToken */,
+        uint256 _underlyingUnits
+    )
+        external
+        view
+        returns (address, uint256, bytes memory)
+    {
+        // exchange(uint256 amount)
+        bytes memory callData = abi.encodeWithSignature("exchange(uint256)", _underlyingUnits);
+
+        return (pegExchanger, 0, callData);
+    }
+
+    /**
+     * This function will revert, since migration cannot be reversed.
+     */
+    function getUnwrapCallData(
+        address /* _underlyingToken */,
+        address /* _wrappedToken */,
+        uint256 /* _wrappedTokenUnits */
+    )
+        external
+        pure
+        returns (address, uint256, bytes memory)
+    {
+        revert("RGT migration cannot be reversed");
+    }
+
+    /**
+     * Returns the address to approve source tokens for wrapping.
+     *
+     * @return address        Address of the contract to approve tokens to
+     */
+    function getSpenderAddress(address /* _underlyingToken */, address /* _wrappedToken */) external view returns(address) {
+        return pegExchanger;
+    }
+}

test/integration/rgtMigrationWrapModule.spec.ts

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+import "module-alias/register";
+import { BigNumber } from "ethers";
+
+import { Address } from "@utils/types";
+import { Account } from "@utils/test/types";
+import { ADDRESS_ZERO, ZERO } from "@utils/constants";
+import { RgtMigrationWrapAdapter, SetToken, StandardTokenMock, TribePegExchangerMock, WrapModule } from "@utils/contracts";
+import DeployHelper from "@utils/deploys";
+import {
+  ether,
+} from "@utils/index";
+import {
+  addSnapshotBeforeRestoreAfterEach,
+  getAccounts,
+  getWaffleExpect,
+  getSystemFixture,
+} from "@utils/test/index";
+import { SystemFixture } from "@utils/fixtures";
+
+const expect = getWaffleExpect();
+
+describe("rgtMigrationWrapModule", () => {
+  let owner: Account;
+  let deployer: DeployHelper;
+  let setup: SystemFixture;
+
+  let wrapModule: WrapModule;
+
+  let rgtToken: StandardTokenMock;
+  let tribeToken: StandardTokenMock;
+  let pegExchanger: TribePegExchangerMock;
+  let adapter: RgtMigrationWrapAdapter;
+
+  const rgtMigrationWrapAdapterIntegrationName: string = "RGT_MIGRATION_WRAPPER";
+  const exchangeRate = 26705673430;
+  const scalar = 1e9;
+
+  before(async () => {
+    [
+      owner,
+    ] = await getAccounts();
+
+    // System setup
+    deployer = new DeployHelper(owner.wallet);
+    setup = getSystemFixture(owner.address);
+    await setup.initialize();
+
+    // WrapModule setup
+    wrapModule = await deployer.modules.deployWrapModule(setup.controller.address, setup.weth.address);
+    await setup.controller.addModule(wrapModule.address);
+
+    rgtToken = await deployer.mocks.deployTokenMock(owner.address);
+    tribeToken = await deployer.mocks.deployTokenMock(owner.address);
+
+    // RgtMigrationWrapV2Adapter setup
+    pegExchanger = await deployer.mocks.deployTribePegExchangerMock(rgtToken.address, tribeToken.address);
+    adapter = await deployer.adapters.deployRgtMigrationWrapAdapter(pegExchanger.address);
+
+    await setup.integrationRegistry.addIntegration(wrapModule.address, rgtMigrationWrapAdapterIntegrationName, adapter.address);
+  });
+
+  addSnapshotBeforeRestoreAfterEach();
+
+  context("when a SetToken has been deployed and issued", async () => {
+    let setToken: SetToken;
+    let setTokensIssued: BigNumber;
+
+    before(async () => {
+      setToken = await setup.createSetToken(
+        [rgtToken.address],
+        [BigNumber.from(10 ** 8)],
+        [setup.issuanceModule.address, wrapModule.address]
+      );
+
+      // Initialize modules
+      await setup.issuanceModule.initialize(setToken.address, ADDRESS_ZERO);
+      await wrapModule.initialize(setToken.address);
+
+      // Issue some Sets
+      setTokensIssued = ether(10);
+      await rgtToken.approve(setup.issuanceModule.address, BigNumber.from(10 ** 9));
+      await setup.issuanceModule.issue(setToken.address, setTokensIssued, owner.address);
+    });
+
+    describe("#wrap", async () => {
+      let subjectSetToken: Address;
+      let subjectUnderlyingToken: Address;
+      let subjectWrappedToken: Address;
+      let subjectUnderlyingUnits: BigNumber;
+      let subjectIntegrationName: string;
+      let subjectCaller: Account;
+
+      beforeEach(async () => {
+        subjectSetToken = setToken.address;
+        subjectUnderlyingToken = rgtToken.address;
+        subjectWrappedToken = tribeToken.address;
+        subjectUnderlyingUnits = BigNumber.from(10 ** 8);
+        subjectIntegrationName = rgtMigrationWrapAdapterIntegrationName;
+        subjectCaller = owner;
+
+        await tribeToken.mint(pegExchanger.address, BigNumber.from(10 ** 9).mul(exchangeRate).div(scalar));
+      });
+
+      async function subject(): Promise<any> {
+        return wrapModule.connect(subjectCaller.wallet).wrap(
+          subjectSetToken,
+          subjectUnderlyingToken,
+          subjectWrappedToken,
+          subjectUnderlyingUnits,
+          subjectIntegrationName
+        );
+      }
+
+      it("should convert underlying balance of RGT tokens to TRIBE tokens * multiplier", async () => {
+        const previousRgtTokenBalance = await rgtToken.balanceOf(setToken.address);
+        const previousTribeTokenBalance = await tribeToken.balanceOf(setToken.address);
+        expect(previousRgtTokenBalance).to.eq(BigNumber.from(10 ** 9));
+        expect(previousTribeTokenBalance).to.eq(ZERO);
+
+        await subject();
+
+        const rgtTokenBalance = await rgtToken.balanceOf(setToken.address);
+        const tribeTokenBalance = await tribeToken.balanceOf(setToken.address);
+        const components = await setToken.getComponents();
+
+        expect(rgtTokenBalance).to.eq(ZERO);
+        expect(tribeTokenBalance).to.eq(previousRgtTokenBalance.mul(exchangeRate).div(scalar));
+        expect(components.length).to.eq(1);
+      });
+    });
+
+    describe("#unwrap", async () => {
+      let subjectSetToken: Address;
+      let subjectUnderlyingToken: Address;
+      let subjectWrappedToken: Address;
+      let subjectWrappedUnits: BigNumber;
+      let subjectIntegrationName: string;
+      let subjectCaller: Account;
+
+      beforeEach(async () => {
+        subjectSetToken = setToken.address;
+        subjectUnderlyingToken = rgtToken.address;
+        subjectWrappedToken = tribeToken.address;
+        subjectWrappedUnits = BigNumber.from(10 ** 8);
+        subjectIntegrationName = rgtMigrationWrapAdapterIntegrationName;
+        subjectCaller = owner;
+
+        await tribeToken.mint(pegExchanger.address, BigNumber.from(10 ** 9).mul(exchangeRate).div(scalar));
+
+        await wrapModule.connect(subjectCaller.wallet).wrap(
+          subjectSetToken,
+          subjectUnderlyingToken,
+          subjectWrappedToken,
+          subjectWrappedUnits,
+          subjectIntegrationName
+        );
+      });
+
+      async function subject(): Promise<any> {
+        return wrapModule.connect(subjectCaller.wallet).unwrap(
+          subjectSetToken,
+          subjectUnderlyingToken,
+          subjectWrappedToken,
+          subjectWrappedUnits,
+          subjectIntegrationName
+        );
+      }
+
+      it("should revert", async () => {
+        await expect(subject()).to.be.revertedWith("RGT migration cannot be reversed");
+      });
+    });
+  });
+});