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This file is part of susyweb.js.
susyweb.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.
susyweb.js is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MSRCHANTABILITY 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 susyweb.js. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @file index.js
* @author Fabian Vogelsteller <fabian@ethereum.org>
* @author Marek Kotewicz <marek@superstring.io>
* @date 2017
*/
"use strict";
var _ = require('underscore');
var errors = require('susyweb-core-helpers').errors;
var formatters = require('susyweb-core-helpers').formatters;
var utils = require('susyweb-utils');
var promiEvent = require('susyweb-core-promievent');
var Subscriptions = require('susyweb-core-subscriptions').subscriptions;
var TIMEOUTBLOCK = 50;
var POLLINGTIMEOUT = 15 * TIMEOUTBLOCK; // ~average block time (seconds) * TIMEOUTBLOCK
var CONFIRMATIONBLOCKS = 24;
var Method = function Method(options) {
if(!options.call || !options.name) {
throw new Error('When creating a method you need to provide at least the "name" and "call" property.');
}
this.name = options.name;
this.call = options.call;
this.params = options.params || 0;
this.inputFormatter = options.inputFormatter;
this.outputFormatter = options.outputFormatter;
this.transformPayload = options.transformPayload;
this.extraFormatters = options.extraFormatters;
this.requestManager = options.requestManager;
// reference to sof.accounts
this.accounts = options.accounts;
this.defaultBlock = options.defaultBlock || 'latest';
this.defaultAccount = options.defaultAccount || null;
};
Method.prototype.setRequestManager = function (requestManager, accounts) {
this.requestManager = requestManager;
// reference to sof.accounts
if (accounts) {
this.accounts = accounts;
}
};
Method.prototype.createFunction = function (requestManager, accounts) {
var func = this.buildCall();
func.call = this.call;
this.setRequestManager(requestManager || this.requestManager, accounts || this.accounts);
return func;
};
Method.prototype.attachToObject = function (obj) {
var func = this.buildCall();
func.call = this.call;
var name = this.name.split('.');
if (name.length > 1) {
obj[name[0]] = obj[name[0]] || {};
obj[name[0]][name[1]] = func;
} else {
obj[name[0]] = func;
}
};
/**
* Should be used to determine name of the jsonrpc method based on arguments
*
* @method getCall
* @param {Array} arguments
* @return {String} name of jsonrpc method
*/
Method.prototype.getCall = function (args) {
return _.isFunction(this.call) ? this.call(args) : this.call;
};
/**
* Should be used to extract callback from array of arguments. Modifies input param
*
* @method extractCallback
* @param {Array} arguments
* @return {Function|Null} callback, if exists
*/
Method.prototype.extractCallback = function (args) {
if (_.isFunction(args[args.length - 1])) {
return args.pop(); // modify the args array!
}
};
/**
* Should be called to check if the number of arguments is correct
*
* @method validateArgs
* @param {Array} arguments
* @throws {Error} if it is not
*/
Method.prototype.validateArgs = function (args) {
if (args.length !== this.params) {
throw errors.InvalidNumberOfParams(args.length, this.params, this.name);
}
};
/**
* Should be called to format input args of method
*
* @method formatInput
* @param {Array}
* @return {Array}
*/
Method.prototype.formatInput = function (args) {
var _this = this;
if (!this.inputFormatter) {
return args;
}
return this.inputFormatter.map(function (formatter, index) {
// bind this for defaultBlock, and defaultAccount
return formatter ? formatter.call(_this, args[index]) : args[index];
});
};
/**
* Should be called to format output(result) of method
*
* @method formatOutput
* @param {Object}
* @return {Object}
*/
Method.prototype.formatOutput = function (result) {
var _this = this;
if(_.isArray(result)) {
return result.map(function(res){
return _this.outputFormatter && res ? _this.outputFormatter(res) : res;
});
} else {
return this.outputFormatter && result ? this.outputFormatter(result) : result;
}
};
/**
* Should create payload from given input args
*
* @method toPayload
* @param {Array} args
* @return {Object}
*/
Method.prototype.toPayload = function (args) {
var call = this.getCall(args);
var callback = this.extractCallback(args);
var params = this.formatInput(args);
this.validateArgs(params);
var payload = {
method: call,
params: params,
callback: callback
};
if (this.transformPayload) {
payload = this.transformPayload(payload);
}
return payload;
};
Method.prototype._confirmTransaction = function (defer, result, payload) {
var method = this,
promiseResolved = false,
canUnsubscribe = true,
timeoutCount = 0,
confirmationCount = 0,
intervalId = null,
gasProvided = (_.isObject(payload.params[0]) && payload.params[0].gas) ? payload.params[0].gas : null,
isContractDeployment = _.isObject(payload.params[0]) &&
payload.params[0].data &&
payload.params[0].from &&
!payload.params[0].to;
// add custom send Methods
var _sophonCalls = [
new Method({
name: 'getTransactionReceipt',
call: 'sof_getTransactionReceipt',
params: 1,
inputFormatter: [null],
outputFormatter: formatters.outputTransactionReceiptFormatter
}),
new Method({
name: 'getCode',
call: 'sof_getCode',
params: 2,
inputFormatter: [formatters.inputAddressFormatter, formatters.inputDefaultBlockNumberFormatter]
}),
new Subscriptions({
name: 'subscribe',
type: 'sof',
subscriptions: {
'newBlockHeaders': {
subscriptionName: 'newHeads', // replace subscription with this name
params: 0,
outputFormatter: formatters.outputBlockFormatter
}
}
})
];
// attach methods to this._sophonCall
var _sophonCall = {};
_.each(_sophonCalls, function (mthd) {
mthd.attachToObject(_sophonCall);
mthd.requestManager = method.requestManager; // assign rather than call setRequestManager()
});
// fire "receipt" and confirmation events and resolve after
var checkConfirmation = function (existingReceipt, isPolling, err, blockHeader, sub) {
Eif (!err) {
// create fake unsubscribe
if (!sub) {
sub = {
unsubscribe: function () {
clearInterval(intervalId);
}
};
}
// if we have a valid receipt we don't need to send a request
return (existingReceipt ? promiEvent.resolve(existingReceipt) : _sophonCall.getTransactionReceipt(result))
// catch error from requesting receipt
.catch(function (err) {
sub.unsubscribe();
promiseResolved = true;
utils._fireError({message: 'Failed to check for transaction receipt:', data: err}, defer.eventEmitter, defer.reject);
})
// if CONFIRMATION listener exists check for confirmations, by setting canUnsubscribe = false
.then(function(receipt) {
if (!receipt || !receipt.blockHash) {
throw new Error('Receipt missing or blockHash null');
}
// apply extra formatters
if (method.extraFormatters && method.extraFormatters.receiptFormatter) {
receipt = method.extraFormatters.receiptFormatter(receipt);
}
// check if confirmation listener exists
if (defer.eventEmitter.listeners('confirmation').length > 0) {
// If there was an immediately retrieved receipt, it's already
// been confirmed by the direct call to checkConfirmation needed
// for susy instant-seal
if (existingReceipt === undefined || confirmationCount !== 0){
defer.eventEmitter.emit('confirmation', confirmationCount, receipt);
}
canUnsubscribe = false;
confirmationCount++;
if (confirmationCount === CONFIRMATIONBLOCKS + 1) { // add 1 so we account for conf 0
sub.unsubscribe();
defer.eventEmitter.removeAllListeners();
}
}
return receipt;
})
// CHECK for CONTRACT DEPLOYMENT
.then(function(receipt) {
if (isContractDeployment && !promiseResolved) {
if (!receipt.contractAddress) {
Eif (canUnsubscribe) {
sub.unsubscribe();
promiseResolved = true;
}
utils._fireError(new Error('The transaction receipt didn\'t contain a contract address.'), defer.eventEmitter, defer.reject);
return;
}
_sophonCall.getCode(receipt.contractAddress, function (e, code) {
Iif (!code) {
return;
}
if (code.length > 2) {
defer.eventEmitter.emit('receipt', receipt);
// if contract, return instance instead of receipt
if (method.extraFormatters && method.extraFormatters.contractDeployFormatter) {
defer.resolve(method.extraFormatters.contractDeployFormatter(receipt));
} else {
defer.resolve(receipt);
}
// need to remove listeners, as they aren't removed automatically when succesfull
Eif (canUnsubscribe) {
defer.eventEmitter.removeAllListeners();
}
} else {
utils._fireError(new Error('The contract code couldn\'t be stored, please check your gas limit.'), defer.eventEmitter, defer.reject);
}
Eif (canUnsubscribe) {
sub.unsubscribe();
}
promiseResolved = true;
});
}
return receipt;
})
// CHECK for normal tx check for receipt only
.then(function(receipt) {
if (!isContractDeployment && !promiseResolved) {
Eif(!receipt.outOfGas &&
(!gasProvided || gasProvided !== receipt.gasUsed) &&
(receipt.status === true || receipt.status === '0x1' || typeof receipt.status === 'undefined')) {
defer.eventEmitter.emit('receipt', receipt);
defer.resolve(receipt);
// need to remove listeners, as they aren't removed automatically when succesfull
if (canUnsubscribe) {
defer.eventEmitter.removeAllListeners();
}
} else {
if(receipt) {
receipt = JSON.stringify(receipt, null, 2);
}
if (receipt.status === false || receipt.status === '0x0') {
utils._fireError(new Error("Transaction has been reverted by the SVM:\n" + receipt),
defer.eventEmitter, defer.reject);
} else {
utils._fireError(
new Error("Transaction ran out of gas. Please provide more gas:\n" + receipt),
defer.eventEmitter, defer.reject);
}
}
if (canUnsubscribe) {
sub.unsubscribe();
}
promiseResolved = true;
}
})
// time out the transaction if not mined after 50 blocks
.catch(function () {
timeoutCount++;
// check to see if we are http polling
Iif(!!isPolling) {
// polling timeout is different than TIMEOUTBLOCK blocks since we are triggering every second
if (timeoutCount - 1 >= POLLINGTIMEOUT) {
sub.unsubscribe();
promiseResolved = true;
utils._fireError(new Error('Transaction was not mined within' + POLLINGTIMEOUT + ' seconds, please make sure your transaction was properly sent. Be aware that it might still be mined!'), defer.eventEmitter, defer.reject);
}
} else {
if (timeoutCount - 1 >= TIMEOUTBLOCK) {
sub.unsubscribe();
promiseResolved = true;
utils._fireError(new Error('Transaction was not mined within 50 blocks, please make sure your transaction was properly sent. Be aware that it might still be mined!'), defer.eventEmitter, defer.reject);
}
}
});
} else {
sub.unsubscribe();
promiseResolved = true;
utils._fireError({message: 'Failed to subscribe to new newBlockHeaders to confirm the transaction receipts.', data: err}, defer.eventEmitter, defer.reject);
}
};
// start watching for confirmation depending on the support features of the provider
var startWatching = function(existingReceipt) {
// if provider allows PUB/SUB
if (_.isFunction(this.requestManager.provider.on)) {
_sophonCall.subscribe('newBlockHeaders', checkConfirmation.bind(null, existingReceipt, false));
} else {
intervalId = setInterval(checkConfirmation.bind(null, existingReceipt, true), 1000);
}
}.bind(this);
// first check if we already have a confirmed transaction
_sophonCall.getTransactionReceipt(result)
.then(function(receipt) {
if (receipt && receipt.blockHash) {
if (defer.eventEmitter.listeners('confirmation').length > 0) {
// We must keep on watching for new Blocks, if a confirmation listener is present
startWatching(receipt);
}
checkConfirmation(receipt, false);
} else Eif (!promiseResolved) {
startWatching();
}
})
.catch(function(){
if (!promiseResolved) startWatching();
});
};
var getWallet = function(from, accounts) {
var wallet = null;
// is index given
if (_.isNumber(from)) {
wallet = accounts.wallet[from];
// is account given
} else if (_.isObject(from) && from.address && from.privateKey) {
wallet = from;
// search in wallet for address
} else {
wallet = accounts.wallet[from.toLowerCase()];
}
return wallet;
};
Method.prototype.buildCall = function() {
var method = this,
isSendTx = (method.call === 'sof_sendTransaction' || method.call === 'sof_sendRawTransaction'); // || method.call === 'personal_sendTransaction'
// actual send function
var send = function () {
var defer = promiEvent(!isSendTx),
payload = method.toPayload(Array.prototype.slice.call(arguments));
// CALLBACK function
var sendTxCallback = function (err, result) {
try {
result = method.formatOutput(result);
} catch(e) {
err = e;
}
if (result instanceof Error) {
err = result;
}
if (!err) {
if (payload.callback) {
payload.callback(null, result);
}
} else {
if(err.error) {
err = err.error;
}
return utils._fireError(err, defer.eventEmitter, defer.reject, payload.callback);
}
// return PROMISE
if (!isSendTx) {
Eif (!err) {
defer.resolve(result);
}
// return PROMIEVENT
} else {
defer.eventEmitter.emit('transactionHash', result);
method._confirmTransaction(defer, result, payload);
}
};
// SENDS the SIGNED SIGNATURE
var sendSignedTx = function(sign){
var signedPayload = _.extend({}, payload, {
method: 'sof_sendRawTransaction',
params: [sign.rawTransaction]
});
method.requestManager.send(signedPayload, sendTxCallback);
};
var sendRequest = function(payload, method) {
if (method && method.accounts && method.accounts.wallet && method.accounts.wallet.length) {
var wallet;
// SOF_SENDTRANSACTION
if (payload.method === 'sof_sendTransaction') {
var tx = payload.params[0];
wallet = getWallet((_.isObject(tx)) ? tx.from : null, method.accounts);
// If wallet was found, sign tx, and send using sendRawTransaction
Eif (wallet && wallet.privateKey) {
return method.accounts.signTransaction(_.omit(tx, 'from'), wallet.privateKey).then(sendSignedTx);
}
// SOF_SIGN
} else Eif (payload.method === 'sof_sign') {
var data = payload.params[1];
wallet = getWallet(payload.params[0], method.accounts);
// If wallet was found, sign tx, and send using sendRawTransaction
Eif (wallet && wallet.privateKey) {
var sign = method.accounts.sign(data, wallet.privateKey);
if (payload.callback) {
payload.callback(null, sign.signature);
}
defer.resolve(sign.signature);
return;
}
}
}
return method.requestManager.send(payload, sendTxCallback);
};
// Send the actual transaction
if(isSendTx && _.isObject(payload.params[0]) && !payload.params[0].gasPrice) {
var getGasPrice = (new Method({
name: 'getGasPrice',
call: 'sof_gasPrice',
params: 0
})).createFunction(method.requestManager);
getGasPrice(function (err, gasPrice) {
Eif (gasPrice) {
payload.params[0].gasPrice = gasPrice;
}
sendRequest(payload, method);
});
} else {
sendRequest(payload, method);
}
return defer.eventEmitter;
};
// necessary to attach things to the method
send.method = method;
// necessary for batch requests
send.request = this.request.bind(this);
return send;
};
/**
* Should be called to create the pure JSONRPC request which can be used in a batch request
*
* @method request
* @return {Object} jsonrpc request
*/
Method.prototype.request = function () {
var payload = this.toPayload(Array.prototype.slice.call(arguments));
payload.format = this.formatOutput.bind(this);
return payload;
};
module.exports = Method;
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