mirror of https://github.com/ethereum/go-ethereum
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
134 lines
4.5 KiB
134 lines
4.5 KiB
/*
|
|
This file is part of ethereum.js.
|
|
|
|
ethereum.js is free software: you can redistribute it and/or modify
|
|
it under the terms of the GNU Lesser General Public License as published by
|
|
the Free Software Foundation, either version 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
ethereum.js 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 Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public License
|
|
along with ethereum.js. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
/** @file contract.js
|
|
* @authors:
|
|
* Marek Kotewicz <marek@ethdev.com>
|
|
* @date 2014
|
|
*/
|
|
|
|
var web3 = require('./web3'); // jshint ignore:line
|
|
var abi = require('./abi');
|
|
|
|
/**
|
|
* This method should be called when we want to call / transact some solidity method from javascript
|
|
* it returns an object which has same methods available as solidity contract description
|
|
* usage example:
|
|
*
|
|
* var abi = [{
|
|
* name: 'myMethod',
|
|
* inputs: [{ name: 'a', type: 'string' }],
|
|
* outputs: [{name: 'd', type: 'string' }]
|
|
* }]; // contract abi
|
|
*
|
|
* var myContract = web3.eth.contract('0x0123123121', abi); // creation of contract object
|
|
*
|
|
* myContract.myMethod('this is test string param for call'); // myMethod call (implicit, default)
|
|
* myContract.call().myMethod('this is test string param for call'); // myMethod call (explicit)
|
|
* myContract.transact().myMethod('this is test string param for transact'); // myMethod transact
|
|
*
|
|
* @param address - address of the contract, which should be called
|
|
* @param desc - abi json description of the contract, which is being created
|
|
* @returns contract object
|
|
*/
|
|
|
|
var contract = function (address, desc) {
|
|
|
|
desc.forEach(function (method) {
|
|
// workaround for invalid assumption that method.name is the full anonymous prototype of the method.
|
|
// it's not. it's just the name. the rest of the code assumes it's actually the anonymous
|
|
// prototype, so we make it so as a workaround.
|
|
if (method.name.indexOf('(') === -1) {
|
|
var displayName = method.name;
|
|
var typeName = method.inputs.map(function(i){return i.type}).join();
|
|
method.name = displayName + '(' + typeName + ')';
|
|
}
|
|
});
|
|
|
|
var inputParser = abi.inputParser(desc);
|
|
var outputParser = abi.outputParser(desc);
|
|
|
|
var result = {};
|
|
|
|
result.call = function (options) {
|
|
result._isTransact = false;
|
|
result._options = options;
|
|
return result;
|
|
};
|
|
|
|
result.transact = function (options) {
|
|
result._isTransact = true;
|
|
result._options = options;
|
|
return result;
|
|
};
|
|
|
|
desc.forEach(function (method) {
|
|
|
|
var displayName = abi.methodDisplayName(method.name);
|
|
var typeName = abi.methodTypeName(method.name);
|
|
|
|
var impl = function () {
|
|
var params = Array.prototype.slice.call(arguments);
|
|
var signature = abi.methodSignature(method.name);
|
|
var parsed = inputParser[displayName][typeName].apply(null, params);
|
|
|
|
var options = result._options || {};
|
|
options.to = address;
|
|
options.data = signature + parsed;
|
|
|
|
var isTransact = result._isTransact === true || (result._isTransact !== false && !method.constant);
|
|
var collapse = options.collapse !== false;
|
|
|
|
// reset
|
|
result._options = {};
|
|
result._isTransact = null;
|
|
|
|
if (isTransact) {
|
|
// it's used byt natspec.js
|
|
// TODO: figure out better way to solve this
|
|
web3._currentContractAbi = desc;
|
|
web3._currentContractAddress = address;
|
|
|
|
// transactions do not have any output, cause we do not know, when they will be processed
|
|
web3.eth.transact(options);
|
|
return;
|
|
}
|
|
|
|
var output = web3.eth.call(options);
|
|
var ret = outputParser[displayName][typeName](output);
|
|
if (collapse)
|
|
{
|
|
if (ret.length == 1)
|
|
ret = ret[0];
|
|
else if (ret.length == 0)
|
|
ret = null;
|
|
}
|
|
return ret;
|
|
};
|
|
|
|
if (result[displayName] === undefined) {
|
|
result[displayName] = impl;
|
|
}
|
|
|
|
result[displayName][typeName] = impl;
|
|
|
|
});
|
|
|
|
return result;
|
|
};
|
|
|
|
module.exports = contract;
|
|
|
|
|