openethereum/js/packages/shared/util/tokens.js

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// Copyright 2015-2017 Parity Technologies (UK) Ltd.
// This file is part of Parity.
// Parity is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// Parity is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with Parity. If not, see <http://www.gnu.org/licenses/>.
import { range } from 'lodash';
import BigNumber from 'bignumber.js';
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import { sha3 } from '@parity/api/util/sha3';
import { IconCache } from '@parity/ui';
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import imagesEthereum from '../assets/images/contracts/ethereum-black-64x64.png';
const BALANCEOF_SIGNATURE = sha3('balanceOf(address)');
const ADDRESS_PADDING = range(24).map(() => '0').join('');
export const ETH_TOKEN = {
address: '',
format: new BigNumber(10).pow(18),
id: sha3('eth_native_token').slice(0, 10),
image: imagesEthereum,
name: 'Ethereum',
native: true,
tag: 'ETH'
};
export function fetchTokenIds (tokenregInstance) {
return tokenregInstance.tokenCount
.call()
.then((numTokens) => {
const tokenIndexes = range(numTokens.toNumber());
return tokenIndexes;
});
}
export function fetchTokenInfo (api, tokenregInstace, tokenIndex) {
return Promise
.all([
tokenregInstace.token.call({}, [tokenIndex]),
tokenregInstace.meta.call({}, [tokenIndex, 'IMG'])
])
.then(([ tokenData, image ]) => {
const [ address, tag, format, name ] = tokenData;
const token = {
format: format.toString(),
index: tokenIndex,
image: IconCache.hashToImage(image),
id: sha3(address + tokenIndex).slice(0, 10),
address,
name,
tag
};
return token;
});
}
/**
* `updates` should be in the shape:
* {
* [ who ]: [ tokenId ] // Array of tokens to updates
* }
*
* Returns a Promise resolved witht the balances in the shape:
* {
* [ who ]: { [ tokenId ]: BigNumber } // The balances of `who`
* }
*/
export function fetchAccountsBalances (api, tokens, updates) {
const addresses = Object.keys(updates);
const promises = addresses
.map((who) => {
const tokensIds = updates[who];
const tokensToUpdate = tokensIds.map((tokenId) => tokens.find((t) => t.id === tokenId));
return fetchAccountBalances(api, tokensToUpdate, who);
});
return Promise.all(promises)
.then((results) => {
return results.reduce((balances, accountBalances, index) => {
balances[addresses[index]] = accountBalances;
return balances;
}, {});
});
}
/**
* Returns a Promise resolved with the balances in the shape:
* {
* [ tokenId ]: BigNumber // Token balance value
* }
*/
export function fetchAccountBalances (api, tokens, who) {
const calldata = '0x' + BALANCEOF_SIGNATURE.slice(2, 10) + ADDRESS_PADDING + who.slice(2);
const promises = tokens.map((token) => fetchTokenBalance(api, token, { who, calldata }));
return Promise.all(promises)
.then((results) => {
return results.reduce((balances, value, index) => {
const token = tokens[index];
balances[token.id] = value;
return balances;
}, {});
});
}
export function fetchTokenBalance (api, token, { who, calldata }) {
if (token.native) {
return api.eth.getBalance(who);
}
return api.eth
.call({ data: calldata, to: token.address })
.then((result) => {
const cleanResult = result.replace(/^0x/, '');
return new BigNumber(`0x${cleanResult || 0}`);
});
}