feat: asset-swapper Fake Taker contract (#151)

packages/asset-swapper/CHANGELOG.json

@@ -29,6 +29,10 @@
             {
                 "note": "Special case BNB in uni v1 sampler",
                 "pr": 147
+            },
+            {
+                "note": "Create `FakeTaker` contract to get result data and gas used",
+                "pr": 151
             }
         ]
     },

packages/asset-swapper/contracts/src/FakeTaker.sol

@@ -0,0 +1,27 @@
+// SPDX-License-Identifier: Apache-2.0
+pragma solidity ^0.6;
+pragma experimental ABIEncoderV2;
+
+contract FakeTaker {
+
+    struct Result {
+        bool success;
+        bytes resultData;
+        uint256 gasUsed;
+    }
+
+    receive() payable external {}
+
+    function execute(address payable to, bytes calldata data)
+        public
+        payable
+        returns (Result memory result)
+    {
+        uint256 gasBefore = gasleft();
+        (
+            result.success,
+            result.resultData
+        ) = to.call{ value: msg.value }(data);
+        result.gasUsed = gasBefore - gasleft();
+    }
+}

packages/asset-swapper/package.json

@@ -36,9 +36,9 @@
         "publish:private": "yarn build && gitpkg publish"
     },
     "config": {
-        "publicInterfaceContracts": "ERC20BridgeSampler,BalanceChecker",
+        "publicInterfaceContracts": "ERC20BridgeSampler,BalanceChecker,FakeTaker",
         "abis:comment": "This list is auto-generated by contracts-gen. Don't edit manually.",
-        "abis": "./test/generated-artifacts/@(ApproximateBuys|BalanceChecker|BalancerSampler|BancorSampler|CurveSampler|DODOSampler|DeploymentConstants|DummyLiquidityProvider|ERC20BridgeSampler|Eth2DaiSampler|IBalancer|IBancor|ICurve|IEth2Dai|IKyberNetwork|IMStable|IMooniswap|IMultiBridge|IShell|IUniswapExchangeQuotes|IUniswapV2Router01|KyberSampler|LiquidityProviderSampler|MStableSampler|MooniswapSampler|MultiBridgeSampler|NativeOrderSampler|SamplerUtils|ShellSampler|SushiSwapSampler|TestERC20BridgeSampler|TestNativeOrderSampler|TwoHopSampler|UniswapSampler|UniswapV2Sampler|UtilitySampler).json",
+        "abis": "./test/generated-artifacts/@(ApproximateBuys|BalanceChecker|BalancerSampler|BancorSampler|CurveSampler|DODOSampler|DeploymentConstants|DummyLiquidityProvider|ERC20BridgeSampler|Eth2DaiSampler|FakeTaker|IBalancer|IBancor|ICurve|IEth2Dai|IKyberNetwork|IMStable|IMooniswap|IMultiBridge|IShell|IUniswapExchangeQuotes|IUniswapV2Router01|KyberSampler|LiquidityProviderSampler|MStableSampler|MooniswapSampler|MultiBridgeSampler|NativeOrderSampler|SamplerUtils|ShellSampler|SushiSwapSampler|TestERC20BridgeSampler|TestNativeOrderSampler|TwoHopSampler|UniswapSampler|UniswapV2Sampler|UtilitySampler).json",
         "postpublish": {
             "assets": []
         }

packages/asset-swapper/src/artifacts.ts

@@ -7,7 +7,9 @@ import { ContractArtifact } from 'ethereum-types';
 
 import * as BalanceChecker from '../generated-artifacts/BalanceChecker.json';
 import * as ERC20BridgeSampler from '../generated-artifacts/ERC20BridgeSampler.json';
+import * as FakeTaker from '../generated-artifacts/FakeTaker.json';
 export const artifacts = {
     ERC20BridgeSampler: ERC20BridgeSampler as ContractArtifact,
     BalanceChecker: BalanceChecker as ContractArtifact,
+    FakeTaker: FakeTaker as ContractArtifact,
 };

packages/asset-swapper/src/index.ts

@@ -162,7 +162,7 @@ export {
     QuoteReportEntry,
 } from './utils/quote_report_generator';
 export { QuoteRequestor } from './utils/quote_requestor';
-export { ERC20BridgeSamplerContract, BalanceCheckerContract } from './wrappers';
+export { ERC20BridgeSamplerContract, BalanceCheckerContract, FakeTakerContract } from './wrappers';
 import { ERC20BridgeSource } from './utils/market_operation_utils/types';
 export type Native = ERC20BridgeSource.Native;
 export type MultiHop = ERC20BridgeSource.MultiHop;

packages/asset-swapper/src/wrappers.ts

@@ -5,3 +5,4 @@
  */
 export * from '../generated-wrappers/balance_checker';
 export * from '../generated-wrappers/erc20_bridge_sampler';
+export * from '../generated-wrappers/fake_taker';

packages/asset-swapper/test/artifacts.ts

@@ -15,6 +15,7 @@ import * as DODOSampler from '../test/generated-artifacts/DODOSampler.json';
 import * as DummyLiquidityProvider from '../test/generated-artifacts/DummyLiquidityProvider.json';
 import * as ERC20BridgeSampler from '../test/generated-artifacts/ERC20BridgeSampler.json';
 import * as Eth2DaiSampler from '../test/generated-artifacts/Eth2DaiSampler.json';
+import * as FakeTaker from '../test/generated-artifacts/FakeTaker.json';
 import * as IBalancer from '../test/generated-artifacts/IBalancer.json';
 import * as IBancor from '../test/generated-artifacts/IBancor.json';
 import * as ICurve from '../test/generated-artifacts/ICurve.json';
@@ -51,6 +52,7 @@ export const artifacts = {
     DeploymentConstants: DeploymentConstants as ContractArtifact,
     ERC20BridgeSampler: ERC20BridgeSampler as ContractArtifact,
     Eth2DaiSampler: Eth2DaiSampler as ContractArtifact,
+    FakeTaker: FakeTaker as ContractArtifact,
     KyberSampler: KyberSampler as ContractArtifact,
     LiquidityProviderSampler: LiquidityProviderSampler as ContractArtifact,
     MStableSampler: MStableSampler as ContractArtifact,

packages/asset-swapper/test/wrappers.ts

@@ -13,6 +13,7 @@ export * from '../test/generated-wrappers/deployment_constants';
 export * from '../test/generated-wrappers/dummy_liquidity_provider';
 export * from '../test/generated-wrappers/erc20_bridge_sampler';
 export * from '../test/generated-wrappers/eth2_dai_sampler';
+export * from '../test/generated-wrappers/fake_taker';
 export * from '../test/generated-wrappers/i_balancer';
 export * from '../test/generated-wrappers/i_bancor';
 export * from '../test/generated-wrappers/i_curve';

packages/asset-swapper/tsconfig.json

@@ -5,6 +5,7 @@
     "files": [
         "generated-artifacts/BalanceChecker.json",
         "generated-artifacts/ERC20BridgeSampler.json",
+        "generated-artifacts/FakeTaker.json",
         "test/generated-artifacts/ApproximateBuys.json",
         "test/generated-artifacts/BalanceChecker.json",
         "test/generated-artifacts/BalancerSampler.json",
@@ -15,6 +16,7 @@
         "test/generated-artifacts/DummyLiquidityProvider.json",
         "test/generated-artifacts/ERC20BridgeSampler.json",
         "test/generated-artifacts/Eth2DaiSampler.json",
+        "test/generated-artifacts/FakeTaker.json",
         "test/generated-artifacts/IBalancer.json",
         "test/generated-artifacts/IBancor.json",
         "test/generated-artifacts/ICurve.json",