From 1f968fa4fdb260f647c06a4cf690792ff7bc45fd Mon Sep 17 00:00:00 2001
From: Amir Bandeali <abandeali1@gmail.com>
Date: Sat, 21 Apr 2018 21:42:36 -0700
Subject: Add ERC20Wrapper

---
 packages/contracts/src/utils/erc20_wrapper.ts | 114 ++++++++++++++++++++++++++
 1 file changed, 114 insertions(+)
 create mode 100644 packages/contracts/src/utils/erc20_wrapper.ts

(limited to 'packages/contracts/src/utils/erc20_wrapper.ts')

diff --git a/packages/contracts/src/utils/erc20_wrapper.ts b/packages/contracts/src/utils/erc20_wrapper.ts
new file mode 100644
index 000000000..950b20c99
--- /dev/null
+++ b/packages/contracts/src/utils/erc20_wrapper.ts
@@ -0,0 +1,114 @@
+import { Deployer } from '@0xproject/deployer';
+import { Provider } from '@0xproject/types';
+import { BigNumber } from '@0xproject/utils';
+import * as _ from 'lodash';
+
+import { DummyERC20TokenContract } from '../contract_wrappers/generated/dummy_e_r_c20_token';
+import { ERC20ProxyContract } from '../contract_wrappers/generated/e_r_c20_proxy';
+
+import { constants } from './constants';
+import { ContractName, ERC20BalancesByOwner } from './types';
+
+export class ERC20Wrapper {
+    private _tokenOwnerAddresses: string[];
+    private _contractOwnerAddress: string;
+    private _deployer: Deployer;
+    private _provider: Provider;
+    private _dummyERC20TokenContracts?: DummyERC20TokenContract[];
+    private _erc20ProxyContract?: ERC20ProxyContract;
+    constructor(deployer: Deployer, provider: Provider, tokenOwnerAddresses: string[], contractOwnerAddress: string) {
+        this._deployer = deployer;
+        this._provider = provider;
+        this._tokenOwnerAddresses = tokenOwnerAddresses;
+        this._contractOwnerAddress = contractOwnerAddress;
+    }
+    public async deployDummyERC20TokensAsync(): Promise<DummyERC20TokenContract[]> {
+        const tokenContractInstances = await Promise.all(
+            _.map(this._tokenOwnerAddresses, tokenOwnerAddress =>
+                this._deployer.deployAsync(ContractName.DummyERC20Token, constants.DUMMY_ERC20_TOKEN_ARGS),
+            ),
+        );
+        this._dummyERC20TokenContracts = _.map(
+            tokenContractInstances,
+            tokenContractInstance =>
+                new DummyERC20TokenContract(tokenContractInstance.abi, tokenContractInstance.address, this._provider),
+        );
+        return this._dummyERC20TokenContracts;
+    }
+    public async deployERC20ProxyAsync(): Promise<ERC20ProxyContract> {
+        const proxyContractInstance = await this._deployer.deployAsync(ContractName.ERC20Proxy);
+        this._erc20ProxyContract = new ERC20ProxyContract(
+            proxyContractInstance.abi,
+            proxyContractInstance.address,
+            this._provider,
+        );
+        return this._erc20ProxyContract;
+    }
+    public async setBalancesAndAllowancesAsync() {
+        if (_.isUndefined(this._dummyERC20TokenContracts)) {
+            throw new Error('Dummy ERC20 tokens not yet deployed, please call "deployDummyERC20TokensAsync"');
+        }
+        if (_.isUndefined(this._erc20ProxyContract)) {
+            throw new Error('ERC20 proxy contract not yet deployed, please call "deployERC20ProxyAsync"');
+        }
+        const setBalancePromises: any[] = [];
+        const setAllowancePromises: any[] = [];
+        _.forEach(this._dummyERC20TokenContracts, dummyERC20TokenContract => {
+            _.forEach(this._tokenOwnerAddresses, tokenOwnerAddress => {
+                setBalancePromises.push(
+                    dummyERC20TokenContract.setBalance.sendTransactionAsync(
+                        tokenOwnerAddress,
+                        constants.INITIAL_ERC20_BALANCE,
+                        { from: this._contractOwnerAddress },
+                    ),
+                );
+                setAllowancePromises.push(
+                    dummyERC20TokenContract.approve.sendTransactionAsync(
+                        (this._erc20ProxyContract as ERC20ProxyContract).address,
+                        constants.INITIAL_ERC20_ALLOWANCE,
+                        { from: tokenOwnerAddress },
+                    ),
+                );
+            });
+        });
+        await Promise.all([...setBalancePromises, ...setAllowancePromises]);
+    }
+    public async getBalancesAsync(): Promise<ERC20BalancesByOwner> {
+        if (_.isUndefined(this._dummyERC20TokenContracts)) {
+            throw new Error('Dummy ERC20 tokens not yet deployed, please call "deployDummyTokensAsync"');
+        }
+        const balancesByOwner: ERC20BalancesByOwner = {};
+        const balancePromises: any[] = [];
+        const balanceInfo: Array<{ tokenOwnerAddress: string; tokenAddress: string }> = [];
+        _.forEach(this._dummyERC20TokenContracts, dummyERC20TokenContract => {
+            _.forEach(this._tokenOwnerAddresses, tokenOwnerAddress => {
+                balancePromises.push(dummyERC20TokenContract.balanceOf.callAsync(tokenOwnerAddress));
+                balanceInfo.push({
+                    tokenOwnerAddress,
+                    tokenAddress: dummyERC20TokenContract.address,
+                });
+            });
+        });
+        const balances = await Promise.all(balancePromises);
+        _.forEach(balances, (balance, balanceIndex) => {
+            const tokenAddress = balanceInfo[balanceIndex].tokenAddress;
+            const tokenOwnerAddress = balanceInfo[balanceIndex].tokenOwnerAddress;
+            if (_.isUndefined(balancesByOwner[tokenOwnerAddress])) {
+                balancesByOwner[tokenOwnerAddress] = {};
+            }
+            const wrappedBalance = new BigNumber(balance);
+            balancesByOwner[tokenOwnerAddress][tokenAddress] = wrappedBalance;
+        });
+        return balancesByOwner;
+    }
+    public getTokenOwnerAddresses(): string[] {
+        return this._tokenOwnerAddresses;
+    }
+    public getTokenAddresses(): string[] {
+        const tokenAddresses = _.map(
+            this._dummyERC20TokenContracts,
+            dummyERC20TokenContract => dummyERC20TokenContract.address,
+        );
+        return tokenAddresses;
+    }
+}
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