mirror of https://github.com/ethereum/go-ethereum
Merge pull request #12 from debris/master
simplifie contract creation && calls, improved added examplespull/272/merge
Jeffrey Wilcke
10 years ago
commit
42713c6e99
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<!doctype> |
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<html> |
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|
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<head> |
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<script type="text/javascript" src="js/es6-promise/promise.min.js"></script> |
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<script type="text/javascript" src="../dist/ethereum.js"></script> |
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<script type="text/javascript"> |
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var web3 = require('web3'); |
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web3.setProvider(new web3.providers.AutoProvider()); |
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// solidity source code |
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var source = "" + |
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"contract test {\n" + |
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" function multiply(uint a) returns(uint d) {\n" + |
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" return a * 7;\n" + |
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" }\n" + |
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"}\n"; |
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// contract description, this will be autogenerated somehow |
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var desc = [{ |
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"name": "multiply", |
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"inputs": [ |
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{ |
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"name": "a", |
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"type": "uint256" |
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} |
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], |
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"outputs": [ |
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{ |
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"name": "d", |
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"type": "uint256" |
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} |
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] |
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}]; |
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var contract; |
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function createExampleContract() { |
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// hide create button |
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document.getElementById('create').style.visibility = 'hidden'; |
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document.getElementById('source').innerText = source; |
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// create contract |
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web3.eth.transact({code: web3.eth.solidity(source)}).then(function (address) { |
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contract = web3.contract(address, desc); |
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document.getElementById('call').style.visibility = 'visible'; |
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}); |
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} |
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function callExampleContract() { |
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// this should be generated by ethereum |
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var param = document.getElementById('value').value; |
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// call the contract |
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contract.multiply(param).call().then(function(res) { |
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document.getElementById('result').innerText = res[0]; |
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}); |
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} |
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</script> |
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</head> |
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<body> |
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<h1>contract</h1> |
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<div id="source"></div> |
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<div id='create'> |
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<button type="button" onClick="createExampleContract();">create example contract</button> |
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</div> |
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<div id='call' style='visibility: hidden;'> |
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<input type="number" id="value" onkeyup='callExampleContract()'></input> |
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</div> |
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<div id="result"></div> |
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</body> |
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</html> |
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@ -0,0 +1,200 @@ |
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/* |
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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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|
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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 abi.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 findIndex = function (array, callback) { |
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var end = false; |
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var i = 0; |
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for (; i < array.length && !end; i++) { |
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end = callback(array[i]); |
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} |
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return end ? i - 1 : -1; |
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}; |
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var findMethodIndex = function (json, methodName) { |
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return findIndex(json, function (method) { |
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return method.name === methodName; |
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}); |
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}; |
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var padLeft = function (number, n) { |
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return (new Array(n * 2 - number.toString().length + 1)).join("0") + number; |
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}; |
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var setupInputTypes = function () { |
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var prefixedType = function (prefix) { |
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return function (type, value) { |
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var expected = prefix; |
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if (type.indexOf(expected) !== 0) { |
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return false; |
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} |
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var padding = parseInt(type.slice(expected.length)) / 8; |
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return padLeft(value, padding); |
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}; |
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}; |
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var namedType = function (name, padding, formatter) { |
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return function (type, value) { |
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if (type !== name) { |
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return false;
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} |
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return padLeft(formatter ? value : formatter(value), padding); |
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}; |
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}; |
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var formatBool = function (value) { |
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return value ? '1' : '0'; |
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}; |
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return [ |
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prefixedType('uint'), |
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prefixedType('int'), |
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namedType('address', 20), |
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namedType('bool', 1, formatBool), |
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]; |
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}; |
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var inputTypes = setupInputTypes(); |
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var toAbiInput = function (json, methodName, params) { |
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var bytes = ""; |
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var index = findMethodIndex(json, methodName); |
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if (index === -1) { |
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return; |
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} |
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// it needs to be checked in WebThreeStubServer
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// something wrong might be with this additional zero
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bytes = bytes + index + 'x' + '0'; |
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var method = json[index]; |
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for (var i = 0; i < method.inputs.length; i++) { |
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var found = false; |
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for (var j = 0; j < inputTypes.length && !found; j++) { |
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var val = parseInt(params[i]).toString(16); |
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found = inputTypes[j](method.inputs[i].type, val); |
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} |
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if (!found) { |
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console.error('unsupported json type: ' + method.inputs[i].type); |
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} |
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bytes += found; |
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} |
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return bytes; |
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}; |
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var setupOutputTypes = function () { |
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var prefixedType = function (prefix) { |
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return function (type) { |
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var expected = prefix; |
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if (type.indexOf(expected) !== 0) { |
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return -1; |
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} |
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var padding = parseInt(type.slice(expected.length)) / 8; |
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return padding * 2; |
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}; |
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}; |
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var namedType = function (name, padding) { |
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return function (type) { |
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return name === type ? padding * 2: -1; |
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}; |
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}; |
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var formatInt = function (value) { |
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return parseInt(value, 16); |
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}; |
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var formatBool = function (value) { |
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return value === '1' ? true : false; |
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}; |
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return [ |
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{ padding: prefixedType('uint'), format: formatInt }, |
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{ padding: prefixedType('int'), format: formatInt }, |
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{ padding: namedType('address', 20) }, |
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{ padding: namedType('bool', 1), format: formatBool } |
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]; |
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}; |
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var outputTypes = setupOutputTypes(); |
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var fromAbiOutput = function (json, methodName, output) { |
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var index = findMethodIndex(json, methodName); |
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if (index === -1) { |
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return; |
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} |
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output = output.slice(2); |
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var result = []; |
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var method = json[index]; |
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for (var i = 0; i < method.outputs.length; i++) { |
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var padding = -1; |
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for (var j = 0; j < outputTypes.length && padding === -1; j++) { |
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padding = outputTypes[j].padding(method.outputs[i].type); |
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} |
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if (padding === -1) { |
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// not found output parsing
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continue; |
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} |
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var res = output.slice(0, padding); |
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var formatter = outputTypes[j - 1].format; |
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result.push(formatter ? formatter(res): res); |
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output = output.slice(padding); |
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} |
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return result; |
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}; |
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var inputParser = function (json) { |
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var parser = {}; |
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json.forEach(function (method) { |
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parser[method.name] = function () { |
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var params = Array.prototype.slice.call(arguments); |
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return toAbiInput(json, method.name, params); |
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}; |
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}); |
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return parser; |
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}; |
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var outputParser = function (json) { |
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var parser = {}; |
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json.forEach(function (method) { |
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parser[method.name] = function (output) { |
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return fromAbiOutput(json, method.name, output); |
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}; |
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}); |
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return parser; |
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}; |
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module.exports = { |
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inputParser: inputParser, |
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outputParser: outputParser |
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}; |
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