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universal-dapp.js
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universal-dapp.js
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/* global prompt */
var $ = require('jquery');
var EthJSVM = require('ethereumjs-vm');
var ethJSUtil = require('ethereumjs-util');
var EthJSTX = require('ethereumjs-tx');
var ethJSABI = require('ethereumjs-abi');
var EthJSBlock = require('ethereumjs-block');
var BN = ethJSUtil.BN;
function UniversalDApp (contracts, options) {
var self = this;
self.options = options || {};
self.$el = $('<div class="udapp" />');
self.contracts = contracts;
self.renderOutputModifier = options.renderOutputModifier || function (name, content) { return content; };
self.web3 = options.web3;
if (options.mode === 'vm') {
// FIXME: use `options.vm` or `self.vm` consistently
options.vm = true;
self.accounts = {};
self.vm = new EthJSVM(null, null, { activatePrecompiles: true, enableHomestead: true });
self.addAccount('3cd7232cd6f3fc66a57a6bedc1a8ed6c228fff0a327e169c2bcc5e869ed49511');
self.addAccount('2ac6c190b09897cd8987869cc7b918cfea07ee82038d492abce033c75c1b1d0c');
} else if (options.mode !== 'web3') {
throw new Error('Either VM or Web3 mode must be selected');
}
}
UniversalDApp.prototype.addAccount = function (privateKey, balance) {
var self = this;
if (self.accounts) {
privateKey = new Buffer(privateKey, 'hex');
var address = ethJSUtil.privateToAddress(privateKey);
// FIXME: we don't care about the callback, but we should still make this proper
self.vm.stateManager.putAccountBalance(address, balance || 'f00000000000000001', function cb () {});
self.accounts['0x' + address.toString('hex')] = { privateKey: privateKey, nonce: 0 };
}
};
UniversalDApp.prototype.getAccounts = function (cb) {
var self = this;
if (!self.vm) {
self.web3.eth.getAccounts(cb);
} else {
if (!self.accounts) {
return cb('No accounts?');
}
cb(null, Object.keys(self.accounts));
}
};
UniversalDApp.prototype.getBalance = function (address, cb) {
var self = this;
address = ethJSUtil.stripHexPrefix(address);
if (!self.vm) {
self.web3.eth.getBalance(address, function (err, res) {
if (err) {
cb(err);
} else {
cb(null, res.toString(10));
}
});
} else {
if (!self.accounts) {
return cb('No accounts?');
}
self.vm.stateManager.getAccountBalance(new Buffer(address, 'hex'), function (err, res) {
if (err) {
cb('Account not found');
} else {
cb(null, new BN(res).toString(10));
}
});
}
};
UniversalDApp.prototype.render = function () {
var self = this;
if (self.contracts.length === 0) {
self.$el.append(self.getABIInputForm());
} else {
for (var c in self.contracts) {
var $contractEl = $('<div class="contract"/>');
if (self.contracts[c].address) {
self.getInstanceInterface(self.contracts[c], self.contracts[c].address, $contractEl);
} else {
var $title = $('<span class="title"/>').text(self.contracts[c].name);
if (self.contracts[c].bytecode) {
$title.append($('<div class="size"/>').text((self.contracts[c].bytecode.length / 2) + ' bytes'));
}
$contractEl.append($title).append(self.getCreateInterface($contractEl, self.contracts[c]));
}
self.$el.append(self.renderOutputModifier(self.contracts[c].name, $contractEl));
}
}
var $legend = $('<div class="legend" />')
.append($('<div class="attach"/>').text('Attach'))
.append($('<div class="transact"/>').text('Transact'))
.append($('<div class="call"/>').text('Call'));
self.$el.append($('<div class="poweredBy" />')
.html('<a href="http://github.com/d11e9/universal-dapp">Universal ÐApp</a> powered by The Blockchain'));
self.$el.append($legend);
return self.$el;
};
UniversalDApp.prototype.getContractByName = function (contractName) {
var self = this;
for (var c in self.contracts) {
if (self.contracts[c].name === contractName) {
return self.contracts[c];
}
}
return null;
};
UniversalDApp.prototype.getABIInputForm = function (cb) {
var self = this;
var $el = $('<div class="udapp-setup" />');
var $jsonInput = $('<textarea class="json" placeholder=\'[ { "name": name, "bytecode": bytecode, "interface": abi }, { ... } ]\'/>');
var $createButton = $('<button class="udapp-create"/>').text('Create a Universal ÐApp');
$createButton.click(function (ev) {
var contracts = $.parseJSON($jsonInput.val());
if (cb) {
var err = null;
var dapp = null;
try {
dapp = new UniversalDApp(contracts, self.options);
} catch (e) {
err = e;
}
cb(err, dapp);
} else {
self.contracts = contracts;
self.$el.empty().append(self.render());
}
});
$el.append($jsonInput).append($createButton);
return $el;
};
UniversalDApp.prototype.getCreateInterface = function ($container, contract) {
var self = this;
var $createInterface = $('<div class="create"/>');
if (self.options.removable) {
var $close = $('<div class="udapp-close" />');
$close.click(function () { self.$el.remove(); });
$createInterface.append($close);
}
var $newButton = self.getInstanceInterface(contract);
var $atButton = $('<button class="atAddress"/>').text('At Address').click(function () { self.clickContractAt(self, $container.find('.createContract'), contract); });
$createInterface.append($atButton).append($newButton);
return $createInterface;
};
UniversalDApp.prototype.getInstanceInterface = function (contract, address, $target) {
var self = this;
var abi = JSON.parse(contract.interface).sort(function (a, b) {
if (a.name > b.name) {
return -1;
} else {
return 1;
}
}).sort(function (a, b) {
if (a.constant === true) {
return -1;
} else {
return 1;
}
});
var funABI = self.getConstructorInterface(abi);
var $createInterface = $('<div class="createContract"/>');
var appendFunctions = function (address, $el) {
var $instance = $('<div class="instance"/>');
if (self.options.removable_instances) {
var $close = $('<div class="udapp-close" />');
$close.click(function () { $instance.remove(); });
$instance.append($close);
}
var context = self.options.vm ? 'memory' : 'blockchain';
address = (address.slice(0, 2) === '0x' ? '' : '0x') + address.toString('hex');
var $title = $('<span class="title"/>').text(contract.name + ' at ' + address + ' (' + context + ')');
$title.click(function () {
$instance.toggleClass('hide');
});
var $events = $('<div class="events"/>');
var parseLogs = function (err, response) {
if (err) {
return;
}
var $event = $('<div class="event" />');
var $close = $('<div class="udapp-close" />');
$close.click(function () { $event.remove(); });
$event.append($('<span class="name"/>').text(response.event))
.append($('<span class="args" />').text(JSON.stringify(response.args, null, 2)))
.append($close);
$events.append($event);
};
if (self.options.vm) {
// FIXME: support indexed events
var eventABI = {};
$.each(abi, function (i, funABI) {
if (funABI.type !== 'event') {
return;
}
var hash = ethJSABI.eventID(funABI.name, funABI.inputs.map(function (item) { return item.type; }));
eventABI[hash.toString('hex')] = { event: funABI.name, inputs: funABI.inputs };
});
self.vm.on('afterTx', function (response) {
for (var i in response.vm.logs) {
// [address, topics, mem]
var log = response.vm.logs[i];
var abi = eventABI[log[1][0].toString('hex')];
var event = abi.event;
var decoded;
try {
var types = abi.inputs.map(function (item) {
return item.type;
});
decoded = ethJSABI.rawDecode(types, log[2]);
decoded = ethJSABI.stringify(types, decoded);
} catch (e) {
decoded = '0x' + log[2].toString('hex');
}
parseLogs(null, { event: event, args: decoded });
}
});
} else {
var eventFilter = self.web3.eth.contract(abi).at(address).allEvents();
eventFilter.watch(parseLogs);
}
$instance.append($title);
// Add the fallback function
$instance.append(self.getCallButton({
abi: { constant: false, inputs: [], name: '(fallback)', outputs: [], type: 'function' },
encode: function (args) {
return '';
},
address: address
}));
$.each(abi, function (i, funABI) {
if (funABI.type !== 'function') {
return;
}
// @todo getData cannot be used with overloaded functions
$instance.append(self.getCallButton({
abi: funABI,
encode: function (args) {
var types = [];
for (var i = 0; i < funABI.inputs.length; i++) {
types.push(funABI.inputs[i].type);
}
return Buffer.concat([ ethJSABI.methodID(funABI.name, types), ethJSABI.rawEncode(types, args) ]).toString('hex');
},
address: address
}));
});
($el || $createInterface).append($instance.append($events));
};
if (!address || !$target) {
$createInterface.append(self.getCallButton({
abi: funABI,
encode: function (args) {
var types = [];
for (var i = 0; i < funABI.inputs.length; i++) {
types.push(funABI.inputs[i].type);
}
// NOTE: the caller will concatenate the bytecode and this
// it could be done here too for consistency
return ethJSABI.rawEncode(types, args).toString('hex');
},
contractName: contract.name,
bytecode: contract.bytecode,
appendFunctions: appendFunctions
}));
} else {
appendFunctions(address, $target);
}
return $createInterface;
};
UniversalDApp.prototype.getConstructorInterface = function (abi) {
var funABI = { 'name': '', 'inputs': [], 'type': 'constructor', 'outputs': [] };
for (var i = 0; i < abi.length; i++) {
if (abi[i].type === 'constructor') {
funABI.inputs = abi[i].inputs || [];
break;
}
}
return funABI;
};
UniversalDApp.prototype.getCallButton = function (args) {
var self = this;
// args.abi, args.encode, args.bytecode [constr only], args.address [fun only]
// args.contractName [constr only], args.appendFunctions [constr only]
var isConstructor = args.bytecode !== undefined;
var lookupOnly = (args.abi.constant && !isConstructor);
var inputs = '';
$.each(args.abi.inputs, function (i, inp) {
if (inputs !== '') {
inputs += ', ';
}
inputs += inp.type + ' ' + inp.name;
});
var inputField = $('<input/>').attr('placeholder', inputs).attr('title', inputs);
var $outputOverride = $('<div class="value" />');
var outputSpan = $('<div class="output"/>');
var getReturnOutput = function (result) {
var returnName = lookupOnly ? 'Value' : 'Result';
var returnCls = lookupOnly ? 'value' : 'returned';
return $('<div class="' + returnCls + '">').html('<strong>' + returnName + ':</strong> ' + JSON.stringify(result, null, 2));
};
var getGasUsedOutput = function (result, vmResult) {
var $gasUsed = $('<div class="gasUsed">');
var caveat = lookupOnly ? '<em>(<span class="caveat" title="Cost only applies when called by a contract">caveat</span>)</em>' : '';
var gas;
if (result.gasUsed) {
gas = result.gasUsed.toString(10);
$gasUsed.html('<strong>Transaction cost:</strong> ' + gas + ' gas. ' + caveat);
}
if (vmResult && vmResult.gasUsed) {
var $callGasUsed = $('<div class="gasUsed">');
gas = vmResult.gasUsed.toString(10);
$callGasUsed.append('<strong>Execution cost:</strong> ' + gas + ' gas.');
$gasUsed.append($callGasUsed);
}
return $gasUsed;
};
var getDecodedOutput = function (result) {
var $decoded;
if (Array.isArray(result)) {
$decoded = $('<ol>');
for (var i = 0; i < result.length; i++) {
$decoded.append($('<li>').text(result[i]));
}
} else {
$decoded = result;
}
return $('<div class="decoded">').html('<strong>Decoded:</strong> ').append($decoded);
};
var getOutput = function () {
var $result = $('<div class="result" />');
var $close = $('<div class="udapp-close" />');
$close.click(function () { $result.remove(); });
$result.append($close);
return $result;
};
var clearOutput = function ($result) {
$(':not(.udapp-close)', $result).remove();
};
var replaceOutput = function ($result, message) {
clearOutput($result);
$result.append(message);
};
var handleCallButtonClick = function (ev, $result) {
if (!$result) {
$result = getOutput();
if (lookupOnly && !inputs.length) {
$outputOverride.empty().append($result);
} else {
outputSpan.append($result);
}
}
var funArgs = '';
try {
funArgs = $.parseJSON('[' + inputField.val() + ']');
} catch (e) {
replaceOutput($result, $('<span/>').text('Error encoding arguments: ' + e));
return;
}
var data = '';
if (!isConstructor || funArgs.length > 0) {
try {
data = args.encode(funArgs);
} catch (e) {
replaceOutput($result, $('<span/>').text('Error encoding arguments: ' + e));
return;
}
}
if (data.slice(0, 9) === 'undefined') {
data = data.slice(9);
}
if (data.slice(0, 2) === '0x') {
data = data.slice(2);
}
replaceOutput($result, $('<span>Waiting for transaction to be mined...</span>'));
if (isConstructor) {
if (args.bytecode.indexOf('_') >= 0) {
replaceOutput($result, $('<span>Deploying and linking required libraries...</span>'));
self.linkBytecode(args.contractName, function (err, bytecode) {
if (err) {
replaceOutput($result, $('<span/>').text('Error deploying required libraries: ' + err));
} else {
args.bytecode = bytecode;
handleCallButtonClick(ev, $result);
}
});
return;
} else {
data = args.bytecode + data;
}
}
var decodeResponse = function (response) {
// Only decode if there supposed to be fields
if (args.abi.outputs.length > 0) {
try {
var i;
var outputTypes = [];
for (i = 0; i < args.abi.outputs.length; i++) {
outputTypes.push(args.abi.outputs[i].type);
}
// decode data
var decodedObj = ethJSABI.rawDecode(outputTypes, response);
// format decoded data
decodedObj = ethJSABI.stringify(outputTypes, decodedObj);
for (i = 0; i < outputTypes.length; i++) {
var name = args.abi.outputs[i].name;
if (name.length > 0) {
decodedObj[i] = outputTypes[i] + ' ' + name + ': ' + decodedObj[i];
} else {
decodedObj[i] = outputTypes[i] + ': ' + decodedObj[i];
}
}
return getDecodedOutput(decodedObj);
} catch (e) {
return getDecodedOutput('Failed to decode output: ' + e);
}
}
};
var decoded;
self.runTx(data, args, function (err, result) {
if (err) {
replaceOutput($result, $('<span/>').text(err).addClass('error'));
// VM only
} else if (self.options.vm && result.vm.exception && result.vm.exceptionError) {
replaceOutput($result, $('<span/>').text('VM Exception: ' + result.vm.exceptionError).addClass('error'));
// VM only
} else if (self.options.vm && result.vm.return === undefined) {
replaceOutput($result, $('<span/>').text('Exception during execution.').addClass('error'));
} else if (isConstructor) {
replaceOutput($result, getGasUsedOutput(result, result.vm));
args.appendFunctions(self.options.vm ? result.createdAddress : result.contractAddress);
} else if (self.options.vm) {
var outputObj = '0x' + result.vm.return.toString('hex');
clearOutput($result);
$result.append(getReturnOutput(outputObj)).append(getGasUsedOutput(result, result.vm));
decoded = decodeResponse(result.vm.return);
if (decoded) {
$result.append(decoded);
}
} else if (args.abi.constant && !isConstructor) {
clearOutput($result);
$result.append(getReturnOutput(result)).append(getGasUsedOutput({}));
decoded = decodeResponse(ethJSUtil.toBuffer(result));
if (decoded) {
$result.append(decoded);
}
} else {
clearOutput($result);
$result.append(getReturnOutput(result)).append(getGasUsedOutput(result));
}
});
};
var button = $('<button />')
.addClass('call')
.attr('title', args.abi.name)
.text(args.bytecode ? 'Create' : args.abi.name)
.click(handleCallButtonClick);
if (lookupOnly && !inputs.length) {
handleCallButtonClick();
}
var $contractProperty = $('<div class="contractProperty"/>');
$contractProperty
.toggleClass('constant', !isConstructor && args.abi.constant)
.toggleClass('hasArgs', args.abi.inputs.length > 0)
.toggleClass('constructor', isConstructor)
.append(button)
.append((lookupOnly && !inputs.length) ? $outputOverride : inputField);
return $contractProperty.append(outputSpan);
};
UniversalDApp.prototype.linkBytecode = function (contractName, cb) {
var self = this;
var bytecode = self.getContractByName(contractName).bytecode;
if (bytecode.indexOf('_') < 0) {
return cb(null, bytecode);
}
var m = bytecode.match(/__([^_]{1,36})__/);
if (!m) {
return cb('Invalid bytecode format.');
}
var libraryName = m[1];
if (!self.getContractByName(libraryName)) {
return cb('Library ' + libraryName + ' not found.');
}
self.deployLibrary(libraryName, function (err, address) {
if (err) {
return cb(err);
}
var libLabel = '__' + libraryName + Array(39 - libraryName.length).join('_');
var hexAddress = address.toString('hex');
if (hexAddress.slice(0, 2) === '0x') {
hexAddress = hexAddress.slice(2);
}
hexAddress = Array(40 - hexAddress.length + 1).join('0') + hexAddress;
while (bytecode.indexOf(libLabel) >= 0) {
bytecode = bytecode.replace(libLabel, hexAddress);
}
self.getContractByName(contractName).bytecode = bytecode;
self.linkBytecode(contractName, cb);
});
};
UniversalDApp.prototype.deployLibrary = function (contractName, cb) {
var self = this;
if (self.getContractByName(contractName).address) {
return cb(null, self.getContractByName(contractName).address);
}
var bytecode = self.getContractByName(contractName).bytecode;
if (bytecode.indexOf('_') >= 0) {
self.linkBytecode(contractName, function (err, bytecode) {
if (err) cb(err);
else self.deployLibrary(contractName, cb);
});
} else {
self.runTx(bytecode, { abi: { constant: false }, bytecode: bytecode }, function (err, result) {
if (err) {
return cb(err);
}
var address = self.options.vm ? result.createdAddress : result.contractAddress;
self.getContractByName(contractName).address = address;
cb(err, address);
});
}
};
UniversalDApp.prototype.clickContractAt = function (self, $output, contract) {
var address = prompt('What Address is this contract at in the Blockchain? ie: 0xdeadbeaf...');
self.getInstanceInterface(contract, address, $output);
};
function tryTillResponse (web3, txhash, done) {
web3.eth.getTransactionReceipt(txhash, function (err, address) {
if (!err && !address) {
// Try again with a bit of delay
setTimeout(function () { tryTillResponse(web3, txhash, done); }, 500);
} else {
done(err, address);
}
});
}
UniversalDApp.prototype.runTx = function (data, args, cb) {
var self = this;
var to = args.address;
var constant = args.abi.constant;
var isConstructor = args.bytecode !== undefined;
if (data.slice(0, 2) !== '0x') {
data = '0x' + data;
}
var gas = self.options.getGas ? self.options.getGas : 1000000;
var value = 0;
if (self.options.getValue) {
try {
value = self.options.getValue();
} catch (e) {
return cb(e);
}
}
var tx;
if (!self.vm) {
tx = {
from: self.options.getAddress ? self.options.getAddress() : self.web3.eth.accounts[0],
to: to,
data: data,
gas: gas,
value: value
};
if (constant && !isConstructor) {
self.web3.eth.call(tx, cb);
} else {
self.web3.eth.estimateGas(tx, function (err, resp) {
if (err) {
return cb(err, resp);
}
tx.gas = resp;
self.web3.eth.sendTransaction(tx, function (err, resp) {
if (err) {
return cb(err, resp);
}
tryTillResponse(self.web3, resp, cb);
});
});
}
} else {
try {
var address = self.options.getAddress ? self.options.getAddress() : self.getAccounts()[0];
var account = self.accounts[address];
tx = new EthJSTX({
nonce: new Buffer([account.nonce++]), // @todo count beyond 255
gasPrice: 1,
gasLimit: 3000000000, // plenty
to: to,
value: new BN(value, 10),
data: new Buffer(data.slice(2), 'hex')
});
tx.sign(account.privateKey);
var block = new EthJSBlock({
header: {
// FIXME: support coinbase, difficulty, number and gasLimit
timestamp: new Date().getTime() / 1000 | 0
},
transactions: [],
uncleHeaders: []
});
self.vm.runTx({block: block, tx: tx, skipBalance: true, skipNonce: true}, cb);
} catch (e) {
cb(e, null);
}
}
};
module.exports = UniversalDApp;