128 lines
2.8 KiB
JavaScript
128 lines
2.8 KiB
JavaScript
/**
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* Sample React Native App
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* https://github.com/facebook/react-native
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* @flow
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*/
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import React, { Component } from 'react';
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import {
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AppRegistry,
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ScrollView,
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StyleSheet,
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Text,
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View
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} from 'react-native';
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import base64 from 'base64-js';
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import dgram from 'dgram';
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function randomPort() {
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return Math.random() * 60536 | 0 + 5000 // 60536-65536
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}
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// only works for 8-bit chars
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function toByteArray(obj) {
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var uint = new Uint8Array(obj.length);
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for (var i = 0, l = obj.length; i < l; i++){
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uint[i] = obj.charCodeAt(i);
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}
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return new Uint8Array(uint);
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}
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class rctsockets extends Component {
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constructor(props) {
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super(props);
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this.updateChatter = this.updateChatter.bind(this);
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this.state = { chatter: [] };
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}
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updateChatter(msg) {
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this.setState({
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chatter: this.state.chatter.concat([msg])
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});
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}
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componentDidMount() {
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let self = this;
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let a = dgram.createSocket('udp4');
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let aPort = randomPort();
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a.bind(aPort, function(err) {
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if (err) throw err;
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self.updateChatter('a bound to ' + JSON.stringify(a.address()));
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})
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let b = dgram.createSocket('udp4');
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var bPort = randomPort();
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b.bind(bPort, function(err) {
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if (err) throw err;
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self.updateChatter('b bound to ' + JSON.stringify(b.address()));
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})
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a.on('message', function(data, rinfo) {
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var str = String.fromCharCode.apply(null, new Uint8Array(data));
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self.updateChatter('a received echo ' + str + ' ' + JSON.stringify(rinfo));
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a.close();
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b.close();
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})
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b.on('message', function(data, rinfo) {
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var str = String.fromCharCode.apply(null, new Uint8Array(data));
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self.updateChatter('b received ' + str + ' ' + JSON.stringify(rinfo));
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// echo back
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b.send(data, 0, data.length, aPort, '127.0.0.1', function(err) {
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if (err) throw err
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self.updateChatter('b echoed data')
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})
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})
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b.once('listening', function() {
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var msg = toByteArray('hello')
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a.send(msg, 0, msg.length, bPort, '127.0.0.1', function(err) {
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if (err) throw err
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self.updateChatter('a sent data')
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})
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})
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}
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render() {
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return (
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<View style={styles.container}>
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<ScrollView>
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{this.state.chatter.map((msg, index) => {
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return (
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<Text key={index} style={styles.welcome}>
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{msg}
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</Text>
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);
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})}
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</ScrollView>
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</View>
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);
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}
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}
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const styles = StyleSheet.create({
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container: {
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flex: 1,
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justifyContent: 'center',
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alignItems: 'center',
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backgroundColor: '#F5FCFF',
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},
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welcome: {
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fontSize: 20,
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textAlign: 'center',
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margin: 10,
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},
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instructions: {
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textAlign: 'center',
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color: '#333333',
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marginBottom: 5,
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},
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});
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AppRegistry.registerComponent('rctsockets', () => rctsockets);
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