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89 lines
3.2 KiB
89 lines
3.2 KiB
/*
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This file is part of ethereum.js.
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ethereum.js is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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ethereum.js is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with ethereum.js. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** @file contract.js
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* @authors:
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* Marek Kotewicz <marek@ethdev.com>
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* @date 2014
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*/
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var web3 = require('./web3'); // jshint ignore:line
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var abi = require('./abi');
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/// method signature length in bytes
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var ETH_METHOD_SIGNATURE_LENGTH = 4;
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/**
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* This method should be called when we want to call / transact some solidity method from javascript
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* it returns an object which has same methods available as solidity contract description
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* usage example:
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*
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* var abi = [{
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* name: 'myMethod',
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* inputs: [{ name: 'a', type: 'string' }],
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* outputs: [{name: 'd', type: 'string' }]
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* }]; // contract abi
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*
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* var myContract = web3.eth.contract('0x0123123121', abi); // creation of contract object
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*
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* myContract.myMethod('this is test string param for call').call(); // myMethod call
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* myContract.myMethod('this is test string param for transact').transact() // myMethod transact
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*
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* @param address - address of the contract, which should be called
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* @param desc - abi json description of the contract, which is being created
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* @returns contract object
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*/
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var contract = function (address, desc) {
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var inputParser = abi.inputParser(desc);
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var outputParser = abi.outputParser(desc);
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var contract = {};
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desc.forEach(function (method) {
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contract[method.name] = function () {
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var params = Array.prototype.slice.call(arguments);
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var parsed = inputParser[method.name].apply(null, params);
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var onSuccess = function (result) {
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return outputParser[method.name](result);
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};
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return {
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call: function (extra) {
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extra = extra || {};
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extra.to = address;
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return abi.methodSignature(desc, method.name).then(function (signature) {
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extra.data = signature.slice(0, 2 + ETH_METHOD_SIGNATURE_LENGTH * 2) + parsed;
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return web3.eth.call(extra).then(onSuccess);
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});
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},
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transact: function (extra) {
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extra = extra || {};
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extra.to = address;
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return abi.methodSignature(desc, method.name).then(function (signature) {
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extra.data = signature.slice(0, 2 + ETH_METHOD_SIGNATURE_LENGTH * 2) + parsed;
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return web3.eth.transact(extra).then(onSuccess);
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});
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}
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};
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};
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});
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return contract;
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};
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module.exports = contract;
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