Add Remove Liquidity (#98)

src/components/CurrencyInputPanel/index.js

@@ -56,6 +56,7 @@ class CurrencyInputPanel extends Component {
     addExchange: PropTypes.func.isRequired,
     filteredTokens: PropTypes.arrayOf(PropTypes.string),
     disableUnlock: PropTypes.bool,
+    renderInput: PropTypes.func,
   };
 
   static defaultProps = {
@@ -249,16 +250,76 @@ class CurrencyInputPanel extends Component {
     );
   }
 
+  renderInput() {
+    const {
+      errorMessage,
+      value,
+      onValueChange,
+      selectedTokenAddress,
+      disableTokenSelect,
+      renderInput,
+    } = this.props;
+
+    if (typeof renderInput === 'function') {
+      return renderInput();
+    }
+
+    return (
+      <div className="currency-input-panel__input-row">
+        <input
+          type="number"
+          min="0"
+          className={classnames('currency-input-panel__input',{
+            'currency-input-panel__input--error': errorMessage,
+          })}
+          placeholder="0.0"
+          onChange={e => onValueChange(e.target.value)}
+          onKeyPress={e => {
+            const charCode = e.which ? e.which : e.keyCode;
+
+            // Prevent 'minus' character
+            if (charCode === 45) {
+              e.preventDefault();
+              e.stopPropagation();
+            }
+          }}
+          value={value}
+        />
+        { this.renderUnlockButton() }
+        <button
+          className={classnames("currency-input-panel__currency-select", {
+            'currency-input-panel__currency-select--selected': selectedTokenAddress,
+            'currency-input-panel__currency-select--disabled': disableTokenSelect,
+          })}
+          onClick={() => {
+            if (!disableTokenSelect) {
+              this.setState({ isShowingModal: true });
+            }
+          }}
+        >
+          {
+            selectedTokenAddress
+              ? (
+                <TokenLogo
+                  className="currency-input-panel__selected-token-logo"
+                  address={selectedTokenAddress}
+                />
+              )
+              : null
+          }
+          { TOKEN_ADDRESS_TO_LABEL[selectedTokenAddress] || 'Select a token' }
+          <span className="currency-input-panel__dropdown-icon" />
+        </button>
+      </div>
+    );
+  }
+
   render() {
     const {
       title,
       description,
       extraText,
       errorMessage,
-      value,
-      onValueChange,
-      selectedTokenAddress,
-      disableTokenSelect,
     } = this.props;
 
     return (
@@ -277,52 +338,7 @@ class CurrencyInputPanel extends Component {
               {extraText}
             </span>
           </div>
-          <div className="currency-input-panel__input-row">
+          {this.renderInput()}
-            <input
-              type="number"
-              min="0"
-              className={classnames('currency-input-panel__input',{
-                'currency-input-panel__input--error': errorMessage,
-              })}
-              placeholder="0.0"
-              onChange={e => onValueChange(e.target.value)}
-              onKeyPress={e => {
-                const charCode = e.which ? e.which : e.keyCode;
-
-                // Prevent 'minus' character
-                if (charCode === 45) {
-                  e.preventDefault();
-                  e.stopPropagation();
-                }
-              }}
-              value={value}
-            />
-            { this.renderUnlockButton() }
-            <button
-              className={classnames("currency-input-panel__currency-select", {
-                'currency-input-panel__currency-select--selected': selectedTokenAddress,
-                'currency-input-panel__currency-select--disabled': disableTokenSelect,
-              })}
-              onClick={() => {
-                if (!disableTokenSelect) {
-                  this.setState({ isShowingModal: true });
-                }
-              }}
-            >
-              {
-                selectedTokenAddress
-                  ? (
-                    <TokenLogo
-                      className="currency-input-panel__selected-token-logo"
-                      address={selectedTokenAddress}
-                    />
-                  )
-                  : null
-              }
-              { TOKEN_ADDRESS_TO_LABEL[selectedTokenAddress] || 'Select a token' }
-              <span className="currency-input-panel__dropdown-icon" />
-            </button>
-          </div>
         </div>
         {this.renderModal()}
       </div>

src/ducks/web3connect.js

@@ -44,6 +44,7 @@ const initialState = {
 const TOKEN_LABEL_FALLBACK = {
   '0x89d24A6b4CcB1B6fAA2625fE562bDD9a23260359': 'DAI',
   '0x9f8F72aA9304c8B593d555F12eF6589cC3A579A2': 'MKR',
+  '0x9B913956036a3462330B0642B20D3879ce68b450': 'BAT + ETH'
 };
 
 // selectors
@@ -246,6 +247,7 @@ export const sync = () => async (dispatch, getState) => {
       }
 
       const contract = contracts[tokenAddress] || new web3.eth.Contract(ERC20_ABI, tokenAddress);
+      const contractBytes32 = contracts[tokenAddress] || new web3.eth.Contract(ERC20_WITH_BYTES_ABI, tokenAddress);
 
       if (!contracts[tokenAddress]) {
         dispatch({
@@ -262,7 +264,17 @@ export const sync = () => async (dispatch, getState) => {
         const tokenBalance = getBalance(address, tokenAddress);
         const balance = await contract.methods.balanceOf(address).call();
         const decimals = tokenBalance.decimals || await contract.methods.decimals().call();
-        const symbol = TOKEN_LABEL_FALLBACK[tokenAddress] || tokenBalance.label || await contract.methods.symbol().call();
+        let symbol = tokenBalance.symbol;
+
+        try {
+          symbol = symbol || await contract.methods.symbol().call().catch();
+        } catch (e) {
+          try {
+            symbol = symbol || web3.utils.hexToString(await contractBytes32.methods.symbol().call().catch());
+          } catch (err) {
+
+          }
+        }
 
         if (tokenBalance.value.isEqualTo(BN(balance)) && tokenBalance.label && tokenBalance.decimals) {
           return;

src/pages/App.js

@@ -54,6 +54,7 @@ class App extends Component {
             <Route exact path="/swap" component={Swap} />
             <Route exact path="/send" component={Send} />
             <Route exact path="/add-liquidity" component={Pool} />
+            <Route exact path="/remove-liquidity" component={Pool} />
             <Route exact path="/create-exchange" component={Pool} />
             <Redirect exact from="/" to="/swap" />
           </AnimatedSwitch>

src/pages/Pool/RemoveLiquidity.js

@@ -0,0 +1,294 @@
+import React, { Component } from 'react';
+import PropTypes from 'prop-types';
+import classnames from "classnames";
+import { connect } from 'react-redux';
+import { BigNumber as BN } from 'bignumber.js';
+import NavigationTabs from "../../components/NavigationTabs";
+import ModeSelector from "./ModeSelector";
+import CurrencyInputPanel from "../../components/CurrencyInputPanel";
+import { selectors } from '../../ducks/web3connect';
+import OversizedPanel from "../../components/OversizedPanel";
+import ArrowPlus from "../../assets/images/plus-blue.svg";
+import EXCHANGE_ABI from "../../abi/exchange";
+import promisify from "../../helpers/web3-promisfy";
+
+class RemoveLiquidity extends Component {
+  static propTypes = {
+    account: PropTypes.string,
+    balances: PropTypes.object,
+    web3: PropTypes.object,
+    exchangeAddresses: PropTypes.shape({
+      fromToken: PropTypes.object.isRequired,
+    }).isRequired,
+  };
+
+  state = {
+    tokenAddress: '',
+    value: '',
+    totalSupply: BN(0),
+  };
+
+  reset() {
+    this.setState({
+      value: '',
+    });
+  }
+
+  validate() {
+    const { tokenAddress, value } = this.state;
+    const { account, selectors, exchangeAddresses: { fromToken }, web3 } = this.props;
+    const exchangeAddress = fromToken[tokenAddress];
+
+    if (!web3 || !exchangeAddress || !account || !value) {
+      return {
+        isValid: false,
+      };
+    }
+
+    const { getBalance } = selectors();
+
+    const { value: liquidityBalance, decimals: liquidityDecimals } = getBalance(account, exchangeAddress);
+
+    if (liquidityBalance.isLessThan(BN(value).multipliedBy(10 ** liquidityDecimals))) {
+      return { isValid: false, errorMessage: 'Insufficient balance' };
+    }
+
+    return {
+      isValid: true,
+    };
+  }
+
+  onTokenSelect = async tokenAddress => {
+    const { exchangeAddresses: { fromToken }, web3 } = this.props;
+    const exchangeAddress = fromToken[tokenAddress];
+    this.setState({ tokenAddress });
+
+    if (!web3 || !exchangeAddress) {
+      return;
+    }
+
+    const exchange = new web3.eth.Contract(EXCHANGE_ABI, exchangeAddress);
+
+    const totalSupply = await exchange.methods.totalSupply().call();
+    this.setState({
+      totalSupply: BN(totalSupply),
+    });
+  };
+
+  onInputChange = value => {
+    this.setState({ value });
+  };
+
+  onRemoveLiquidity = async () => {
+    const { tokenAddress, value: input, totalSupply } = this.state;
+    const {
+      exchangeAddresses: { fromToken },
+      web3,
+      selectors,
+      account,
+    } = this.props;
+    const exchangeAddress = fromToken[tokenAddress];
+    const { getBalance } = selectors();
+    if (!web3 || !exchangeAddress) {
+      return;
+    }
+    const exchange = new web3.eth.Contract(EXCHANGE_ABI, exchangeAddress);
+    const SLIPPAGE = .02;
+    const { decimals } = getBalance(account, exchangeAddress);
+    const { value: ethReserve } = getBalance(exchangeAddress);
+    const { value: tokenReserve } = getBalance(exchangeAddress, tokenAddress);
+    const amount = BN(input).multipliedBy(10 ** decimals);
+
+    const ownership = amount.dividedBy(totalSupply);
+    const ethWithdrawn = ethReserve.multipliedBy(ownership);
+    const tokenWithdrawn = tokenReserve.multipliedBy(ownership);
+    const blockNumber = await promisify(web3, 'getBlockNumber');
+    const block = await promisify(web3, 'getBlock', blockNumber);
+    const deadline =  block.timestamp + 300;
+
+    exchange.methods.removeLiquidity(
+      amount.toFixed(0),
+      ethWithdrawn.multipliedBy(1 - SLIPPAGE).toFixed(0),
+      tokenWithdrawn.multipliedBy(1 - SLIPPAGE).toFixed(0),
+      deadline,
+    ).send({ from: account }, (err, data) => {
+      if (data) {
+        this.reset();
+      }
+    });
+  };
+
+  getBalance = () => {
+    const {
+      exchangeAddresses: { fromToken },
+      account,
+      web3,
+      selectors,
+    } = this.props;
+
+    const { tokenAddress } = this.state;
+
+    if (!web3) {
+      return '';
+    }
+
+    const exchangeAddress = fromToken[tokenAddress];
+    if (!exchangeAddress) {
+      return '';
+    }
+    const { value, decimals } = selectors().getBalance(account, exchangeAddress);
+    return `Balance: ${value.dividedBy(10 ** decimals).toFixed(7)}`;
+  };
+
+  renderOutput() {
+    const {
+      exchangeAddresses: { fromToken },
+      account,
+      web3,
+      selectors,
+    } = this.props;
+    const { getBalance } = selectors();
+
+    const { tokenAddress, totalSupply, value: input } = this.state;
+
+
+    const exchangeAddress = fromToken[tokenAddress];
+    if (!exchangeAddress || !web3 || !input) {
+      return [
+        <CurrencyInputPanel
+          key="remove-liquidity-input"
+          title="Output"
+          description="(estimated)"
+          renderInput={() => (
+            <div className="remove-liquidity__output"></div>
+          )}
+          disableTokenSelect
+          disableUnlock
+        />,
+        <OversizedPanel key="remove-liquidity-input-under" hideBottom>
+          <div className="pool__summary-panel">
+            <div className="pool__exchange-rate-wrapper">
+              <span className="pool__exchange-rate">Exchange Rate</span>
+              <span> - </span>
+            </div>
+            <div className="pool__exchange-rate-wrapper">
+              <span className="swap__exchange-rate">Current Pool Size</span>
+              <span> - </span>
+            </div>
+            <div className="pool__exchange-rate-wrapper">
+              <span className="swap__exchange-rate">Your Pool Share</span>
+              <span> - </span>
+            </div>
+          </div>
+        </OversizedPanel>
+      ];
+    }
+    const { value, decimals } = getBalance(account, exchangeAddress);
+    const { value: ethReserve } = getBalance(exchangeAddress);
+    const { value: tokenReserve, label } = getBalance(exchangeAddress, tokenAddress);
+
+    const ownership = value.dividedBy(totalSupply);
+    const ethPer = ethReserve.dividedBy(totalSupply);
+    const tokenPer = tokenReserve.dividedBy(totalSupply);
+
+    return [
+      <CurrencyInputPanel
+        title="Output"
+        description="(estimated)"
+        key="remove-liquidity-input"
+        renderInput={() => (
+          <div className="remove-liquidity__output">
+            <div className="remove-liquidity__output-text">
+              {`${ethPer.multipliedBy(input).toFixed(3)} ETH`}
+            </div>
+            <div className="remove-liquidity__output-plus"> + </div>
+            <div className="remove-liquidity__output-text">
+              {`${tokenPer.multipliedBy(input).toFixed(3)} ${label}`}
+            </div>
+          </div>
+        )}
+        disableTokenSelect
+        disableUnlock
+      />,
+      <OversizedPanel key="remove-liquidity-input-under" hideBottom>
+        <div className="pool__summary-panel">
+          <div className="pool__exchange-rate-wrapper">
+            <span className="pool__exchange-rate">Exchange Rate</span>
+            <span>{` ${ethReserve.dividedBy(10 ** 18).toFixed(2)} ETH + ${tokenReserve.dividedBy(10 ** decimals).toFixed(2)} ${label}`}</span>
+          </div>
+          <div className="pool__exchange-rate-wrapper">
+            <span className="swap__exchange-rate">Current Pool Size</span>
+            <span>{totalSupply.dividedBy(10 ** decimals).toFixed(4)}</span>
+          </div>
+          <div className="pool__exchange-rate-wrapper">
+            <span className="swap__exchange-rate">Your Pool Share</span>
+            <span>{ownership.multipliedBy(100).toFixed(2)}%</span>
+          </div>
+        </div>
+      </OversizedPanel>
+    ];
+  }
+
+  render() {
+    const { isConnected } = this.props;
+    const { tokenAddress, value } = this.state;
+    const { isValid, errorMessage } = this.validate();
+
+    return (
+      <div
+        key="content"
+        className={classnames('swap__content', {
+          'swap--inactive': !isConnected,
+        })}
+      >
+        <NavigationTabs
+          className={classnames('header__navigation', {
+            'header--inactive': !isConnected,
+          })}
+        />
+        <ModeSelector title="Remove Liquidity" />
+        <CurrencyInputPanel
+          title="Pool Tokens"
+          extraText={this.getBalance(tokenAddress)}
+          onValueChange={this.onInputChange}
+          value={value}
+          errorMessage={errorMessage}
+          selectedTokenAddress={tokenAddress}
+          onCurrencySelected={this.onTokenSelect}
+          filteredTokens={['ETH']}
+        />
+        <OversizedPanel>
+          <div className="swap__down-arrow-background">
+            <img className="swap__down-arrow" src={ArrowPlus} />
+          </div>
+        </OversizedPanel>
+        { this.renderOutput() }
+        <div className="pool__cta-container">
+          <button
+            className={classnames('pool__cta-btn', {
+              'swap--inactive': !isConnected,
+              'pool__cta-btn--inactive': !isValid,
+            })}
+            disabled={!isValid}
+            onClick={this.onRemoveLiquidity}
+          >
+            Remove Liquidity
+          </button>
+        </div>
+      </div>
+    );
+  }
+}
+
+export default connect(
+  state => ({
+    isConnected: Boolean(state.web3connect.account),
+    web3: state.web3connect.web3,
+    balances: state.web3connect.balances,
+    account: state.web3connect.account,
+    exchangeAddresses: state.addresses.exchangeAddresses,
+  }),
+  dispatch => ({
+    selectors: () => dispatch(selectors()),
+  })
+)(RemoveLiquidity);

src/pages/Pool/index.js

@@ -2,7 +2,8 @@ import React, { Component } from 'react';
 import Header from '../../components/Header';
 import AddLiquidity from './AddLiquidity';
 import CreateExchange from './CreateExchange';
-import { Switch, Redirect, Route } from 'react-router-dom';
+import RemoveLiquidity from './RemoveLiquidity';
+import { Switch, Route } from 'react-router-dom';
 import "./pool.scss";
 import MediaQuery from "react-responsive";
 
@@ -16,7 +17,7 @@ class Pool extends Component {
         </MediaQuery>
         <Switch>
           <Route exact path="/add-liquidity" component={AddLiquidity} />
-          {/*<Route exact path="/remove" component={Send} />*/}
+          <Route exact path="/remove-liquidity" component={RemoveLiquidity} />
           <Route exact path="/create-exchange" component={CreateExchange} />
         </Switch>
       </div>

src/pages/Pool/pool.scss

@@ -150,3 +150,22 @@
     color: $dove-gray;
   }
 }
+
+.remove-liquidity {
+  &__output {
+    @extend %row-nowrap;
+    min-height: 3.5rem;
+  }
+
+  &__output-text {
+    font-size: 1.25rem;
+    line-height: 1.5rem;
+    padding: 1rem .75rem;
+  }
+
+  &__output-plus {
+    font-size: 1.25rem;
+    line-height: 1.5rem;
+    padding: 1rem 0;
+  }
+}

src/pages/Send/index.js

@@ -666,7 +666,7 @@ class Send extends Component {
         </OversizedPanel>
       );
     }
-
+    console.log(outputLabel)
     return (
       <OversizedPanel hideBottom>
         <div className="swap__exchange-rate-wrapper">

src/pages/Swap/index.js

@@ -450,13 +450,6 @@ class Swap extends Component {
             return;
           }
 
-          console.log(
-            BN(outputValue).multipliedBy(10 ** outputDecimals).toFixed(0),
-            BN(inputValue).multipliedBy(10 ** inputDecimals).multipliedBy(1 + TOKEN_ALLOWED_SLIPPAGE).toFixed(0),
-            inputAmountB.multipliedBy(1.2).toFixed(0),
-            deadline,
-            outputCurrency,
-          )
           new web3.eth.Contract(EXCHANGE_ABI, fromToken[inputCurrency])
             .methods
             .tokenToTokenSwapOutput(