136 lines
4.0 KiB
JavaScript
136 lines
4.0 KiB
JavaScript
/*
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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 event.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 abi = require('./abi');
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var utils = require('./utils');
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/// filter inputs array && returns only indexed (or not) inputs
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/// @param inputs array
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/// @param bool if result should be an array of indexed params on not
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/// @returns array of (not?) indexed params
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var filterInputs = function (inputs, indexed) {
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return inputs.filter(function (current) {
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return current.indexed === indexed;
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});
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};
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var inputWithName = function (inputs, name) {
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var index = utils.findIndex(inputs, function (input) {
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return input.name === name;
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});
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if (index === -1) {
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console.error('indexed param with name ' + name + ' not found');
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return undefined;
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}
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return inputs[index];
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};
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var indexedParamsToTopics = function (event, indexed) {
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// sort keys?
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return Object.keys(indexed).map(function (key) {
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var inputs = [inputWithName(filterInputs(event.inputs, true), key)];
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var value = indexed[key];
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if (value instanceof Array) {
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return value.map(function (v) {
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return abi.formatInput(inputs, [v]);
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});
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}
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return abi.formatInput(inputs, [value]);
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});
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};
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var inputParser = function (address, signature, event) {
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// valid options are 'earliest', 'latest', 'offset' and 'max', as defined for 'eth.watch'
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return function (indexed, options) {
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var o = options || {};
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o.address = address;
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o.topic = [];
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o.topic.push(signature);
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if (indexed) {
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o.topic = o.topic.concat(indexedParamsToTopics(event, indexed));
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}
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return o;
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};
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};
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var getArgumentsObject = function (inputs, indexed, notIndexed) {
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var indexedCopy = indexed.slice();
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var notIndexedCopy = notIndexed.slice();
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return inputs.reduce(function (acc, current) {
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var value;
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if (current.indexed)
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value = indexed.splice(0, 1)[0];
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else
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value = notIndexed.splice(0, 1)[0];
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acc[current.name] = value;
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return acc;
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}, {});
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};
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var outputParser = function (event) {
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return function (output) {
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var result = {
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event: utils.extractDisplayName(event.name),
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number: output.number,
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args: {}
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};
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if (!output.topic) {
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return result;
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}
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var indexedOutputs = filterInputs(event.inputs, true);
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var indexedData = "0x" + output.topic.slice(1, output.topic.length).map(function (topic) { return topic.slice(2); }).join("");
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var indexedRes = abi.formatOutput(indexedOutputs, indexedData);
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var notIndexedOutputs = filterInputs(event.inputs, false);
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var notIndexedRes = abi.formatOutput(notIndexedOutputs, output.data);
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result.args = getArgumentsObject(event.inputs, indexedRes, notIndexedRes);
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return result;
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};
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};
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var getMatchingEvent = function (events, payload) {
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for (var i = 0; i < events.length; i++) {
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var signature = abi.eventSignatureFromAscii(events[i].name);
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if (signature === payload.topic[0]) {
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return events[i];
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}
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}
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return undefined;
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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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getMatchingEvent: getMatchingEvent
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};
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