mainnet connector

Signed-off-by: pradyuman-verma <pradyumnverma27@gmail.com>

contracts/mainnet/connectors/dexSimulation/events.sol

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+//SPDX-License-Identifier: MIT
+pragma solidity ^0.7.0;
+
+contract Events {
+	event LogSimulateSwap(
+		address sellToken,
+		address buyToken,
+		uint256 sellAmount,
+		uint256 buyAmount
+	);
+}

contracts/mainnet/connectors/dexSimulation/helpers.sol

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+//SPDX-License-Identifier: MIT
+pragma solidity ^0.7.0;
+
+import "./interfaces.sol";
+import { Basic } from "../../common/basic.sol";
+import { TokenInterface } from "../../common/interfaces.sol";
+import { Stores } from "../../common/stores.sol";
+
+abstract contract Helpers is Stores, Basic {
+	/**
+	 * @dev dexSimulation Address
+	 */
+	address internal constant dexSimulation =
+		0x49B159E897b7701769B1E66061C8dcCd7240c461;
+}

contracts/mainnet/connectors/dexSimulation/interfaces.sol

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+//SPDX-License-Identifier: MIT
+pragma solidity ^0.7.0;
+
+interface InstaDexSimulation {
+	function swap(
+		address sellToken,
+		address buyToken,
+		uint256 sellAmount,
+		uint256 buyAmount
+	) external payable;
+}

contracts/mainnet/connectors/dexSimulation/main.sol

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+//SPDX-License-Identifier: MIT
+pragma solidity ^0.7.0;
+pragma experimental ABIEncoderV2;
+
+/**
+ * @title Insta dex simulation.
+ * @dev swap.
+ */
+
+import { Events } from "./events.sol";
+import "./helpers.sol";
+
+abstract contract InstaDexSimulationResolver is Events, Helpers {
+	/**
+	 * @dev Simulation swap using Insta dex swap contract
+	 * @param sellToken The token to sell/swap
+	 * @param buyToken The token to buy
+	 * @param sellAmount The sell token amount
+	 * @param buyAmount The buy token amount
+	 * @param setId Set token amount at this ID in `InstaMemory` Contract.
+	 * @param getId Get token amount at this ID in `InstaMemory` Contract.
+	 */
+	function swap(
+		address sellToken,
+		address buyToken,
+		uint256 sellAmount,
+		uint256 buyAmount,
+		uint256 setId,
+		uint256 getId
+	)
+		external
+		payable
+		returns (string memory _eventName, bytes memory _eventParam)
+	{
+		sellAmount = getUint(getId, sellAmount);
+		uint256 nativeAmount;
+
+		if (sellToken == ethAddr) {
+			sellAmount = sellAmount == uint256(-1)
+				? address(this).balance
+				: sellAmount;
+			nativeAmount = sellAmount;
+		} else {
+			TokenInterface tokenContract = TokenInterface(sellToken);
+
+			sellAmount = sellAmount == uint256(-1)
+				? tokenContract.balanceOf(address(this))
+				: sellAmount;
+
+			approve(tokenContract, address(dexSimulation), sellAmount);
+		}
+
+		InstaDexSimulation(dexSimulation).swap{ value: nativeAmount }(
+			sellToken,
+			buyToken,
+			sellAmount,
+			buyAmount
+		);
+
+		setUint(setId, buyAmount);
+
+		_eventName = "LogSimulateSwap(address,address,uint256,uint256)";
+		_eventParam = abi.encode(sellToken, buyToken, sellAmount, buyAmount);
+	}
+}
+
+contract ConnectV2InstaDexSimulation is InstaDexSimulationResolver {
+	string public name = "Instadapp-DEX-Simulation-v1";
+}