feat(gtfs-realtime-bindings): initial commit

gtfs-realtime-bindings/.babelrc

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+{
+  "presets": [
+    "@babel/preset-env",
+    "@babel/preset-react"
+  ]
+}

gtfs-realtime-bindings/.gitignore

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+# Others
+build*
+
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+lerna-debug.log*
+
+# Diagnostic reports (https://nodejs.org/api/report.html)
+report.[0-9]*.[0-9]*.[0-9]*.[0-9]*.json
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+*.lcov
+
+# nyc test coverage
+.nyc_output
+
+# Grunt intermediate storage (https://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+bower_components
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (https://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directories
+node_modules/
+jspm_packages/
+
+# TypeScript v1 declaration files
+typings/
+
+# TypeScript cache
+*.tsbuildinfo
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Microbundle cache
+.rpt2_cache/
+.rts2_cache_cjs/
+.rts2_cache_es/
+.rts2_cache_umd/
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+# dotenv environment variables file
+.env
+.env.test
+
+# parcel-bundler cache (https://parceljs.org/)
+.cache
+
+# Next.js build output
+.next
+
+# Nuxt.js build / generate output
+.nuxt
+dist
+
+# Gatsby files
+.cache/
+# Comment in the public line in if your project uses Gatsby and *not* Next.js
+# https://nextjs.org/blog/next-9-1#public-directory-support
+# public
+
+# vuepress build output
+.vuepress/dist
+
+# Serverless directories
+.serverless/
+
+# FuseBox cache
+.fusebox/
+
+# DynamoDB Local files
+.dynamodb/
+
+# TernJS port file
+.tern-port

gtfs-realtime-bindings/README.md

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+# React.js Example
+
+## Table of Contents
+0. [General](#general)
+1. [Links](#links)
+
+# General
+
+# Links
+
+* [React setup with webpack for beginners](https://dev.to/deepanjangh/react-setup-with-webpack-for-beginners-2a8k)
+* [Production](https://webpack.js.org/guides/production/)
+* [Setup Development and Production Environment for React App](https://medium.com/freestoneinfotech/setup-development-and-production-environment-for-react-app-397c4cc9e382)
+* [HtmlWebpackPlugin](https://webpack.js.org/plugins/html-webpack-plugin/)
+* [load CSS](https://masteringjs.io/tutorials/webpack/css-loader)
+* [load CSS](https://webpack.js.org/loaders/css-loader/)
+* [load CSS](https://blog.jakoblind.no/css-modules-webpack/)

gtfs-realtime-bindings/app/app.jsx

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+import React from 'react';
+import Home from './pages/home';
+export default function App() {
+  return (
+    <div>
+	<h1>React.js</h1>
+	<Home />
+    </div>
+  )
+}

gtfs-realtime-bindings/app/components/hello.jsx

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+import React from 'react';
+import PropTypes from 'prop-types';
+
+//destructure props
+const Hello = ({msg}) => {
+    return (
+	<>
+	    <div>{msg}</div>
+	</>
+    );
+}
+
+export default Hello
+
+Hello.propTypes = {
+    msg: PropTypes.string,
+};

gtfs-realtime-bindings/app/gtfsRtDecode.js

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+const debug = require('debug')('gtfs');
+const GtfsRealtimeBindings = require('gtfs-realtime-bindings');
+
+function decode(buffer){
+    debug('decode...');
+
+    var feed = GtfsRealtimeBindings.transit_realtime.FeedMessage.decode(buffer);
+    if(feed){
+	debug('feed: %s',feed)
+	let header=feed.header;
+	if(header){
+	    debug('header: %s',header)
+	    let gtfsRealtimeVersion=header.gtfsRealtimeVersion;
+	    if(gtfsRealtimeVersion){
+		debug('gtfsRealtimeVersion: %s',gtfsRealtimeVersion)
+	    }
+	}
+	feed.entity.forEach(function(entity) {
+	    if (entity.tripUpdate) {
+		debug('tripUpdate')
+		const tripUpdate=entity.tripUpdate;
+		if(tripUpdate.trip){
+		    debug('TripDescriptor')
+		    const trip=tripUpdate.trip
+		    if(trip.tripId){
+			debug('trip_id: %s',trip.tripId)
+		    }
+		    if(trip.routeId){
+			debug('route_id: %s',trip.routeId)
+		    }
+		    if(trip.directionId){
+			debug('direction_id: %s',trip.directionId)
+		    }
+		    if(trip.startTime){
+			debug('start_time: %s',trip.startTime)
+		    }
+		    if(trip.startDate){
+			debug('start_date: %s',trip.startDate)
+		    }
+		    if(trip.scheduleRelationship){
+			debug('schedule_relationship: %s',trip.scheduleRelationship)
+		    }
+		}
+		if(tripUpdate.vehicle){
+		    debug('VehicleDescriptor')
+		}
+		if(tripUpdate.timestamp){
+		    debug('timestamp: %s',tripUpdate.timestamp)
+		}
+	    }else if(entity.vehicle){
+		const vehPos=entity.vehicle;
+		debug('vehiclePosition')
+		if(vehPos.position){
+		    const pos=vehPos.position;
+		    debug('position')
+		    if(pos.latitude){
+			const lat=pos.latitude;
+			debug('lat: %s',lat)
+		    }
+		    if(pos.longitude){
+			const lon=pos.longitude;
+			debug('lon: %s',lon)
+		    }
+		}
+	    }else if(entity.alert){
+		debug('alert')
+	    }else{
+		debug('entity unknown')
+	    }
+	});
+	// Verify the payload if necessary (i.e. when possibly incomplete or invalid)
+	let errMsg = GtfsRealtimeBindings.transit_realtime.FeedMessage.verify(feed);
+	if (errMsg){
+	    debug('msg invalid')
+	    throw Error(errMsg);
+	}else{
+	    debug('msg valid')
+	}
+    }else{
+	debug('feed unavailable')
+    }
+    debug('...done.')
+    return feed;
+}
+module.exports = {decode}
+

gtfs-realtime-bindings/app/index.jsx

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+import React from 'react';
+import ReactDOM from 'react-dom';
+import App from './app';
+//TODO remove debugging
+if (process.env.NODE_ENV !== 'production') {
+    console.log('development mode');
+}
+//since react 18
+import { createRoot } from 'react-dom/client';
+//create root container
+const root = createRoot(document.getElementById("root"));
+//render root app
+root.render(
+    <React.StrictMode>
+	<App />
+    </React.StrictMode>
+);

gtfs-realtime-bindings/app/pages/home.jsx

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+import React, { useState } from 'react';
+import axios from 'axios';
+import Hello from '../components/hello';
+import GtfsRt from '../gtfsRtDecode';
+import '../style.css';
+const Home = () => {
+    /*storage*/
+    const [vehPos, setVehPos] = useState({});
+    /*fetch vehPost in a JavaScript function*/
+    const getVehPos = async () => {
+        try {
+            /*TODO handle errors: https://www.valentinog.com/blog/await-react/*/
+            let url = 'https://soll.vbn.de/vehicle-positions';
+	    //let url = 'http://localhost:8080/vehicle-positions';
+            const res = await axios.get(url,
+					{
+					    //responseType: 'arraybuffer'
+					    responseType: 'blob'
+					});
+	    //TODO remove debugging
+            if (res.data) {
+                //console.log('getVehPos() JSON res: ', JSON.stringify(res));
+		console.log('getVehPos() res.data: ', res.data);
+		//console.log('getVehPos() JSON res.data: ', JSON.stringify(res.data));
+		let feed=GtfsRt.decode(res.data);
+            } else {
+                console.error('getVehPos() res.data unavailable ');
+            }
+            /*set state*/
+            setVehPos(res.data);
+        } catch (err) {
+            console.error('err.message: ' + err.message);
+        }
+    };
+
+    return (
+	<>
+	    <h2>Home</h2>
+	    <h3>(React.js Lambda Function Component)</h3>
+	    <Hello msg="Hello World!" />
+            <button onClick={getVehPos}>getVehPos</button>
+	</>
+    );
+}
+
+export default Home

gtfs-realtime-bindings/app/style.css

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+h1 { color: red; }
+h2 { color: green; }
+h3 { color: blue; }

gtfs-realtime-bindings/config/webpack.common.js

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+//generate a HTML5 file including all webpack bundles in the body using script tags
+const HtmlWebpackPlugin = require('html-webpack-plugin');
+//path is used to resolve properly across the OS
+const path = require('path');
+module.exports = {
+    //bundle *.js from this entry point
+    entry: path.resolve(__dirname, '../app/index.jsx'),
+    //create output file to be linked to index.html
+    output: {
+        filename: '[name].bundle.js',
+	path: path.resolve(__dirname, '../dist'),
+	clean: true,
+    },
+    module: {
+	rules: [
+	    {
+		//test all *.js using babel-loader
+		//test all *.jsx (e.g. React.js) using babel-loader
+		test: /\.(js|jsx)$/,
+		exclude: /node_modules/,
+		include: path.resolve(__dirname, '../app'),
+		use: ['babel-loader'],
+	    },
+	    {
+		//test all *.css using style-loader and css-loader
+		test: /\.css$/i,
+		use: ["style-loader", "css-loader"],
+	    },
+	]
+    },
+    resolve: {
+	extensions: ['*', '.js', '.jsx'],
+    },
+    plugins: [
+	// create a plugin instance so that you can use it several times anywhere
+	new HtmlWebpackPlugin({
+	    title: 'Production',
+	    template: path.resolve(__dirname, "../public/index.html")
+	}),
+    ],
+};

gtfs-realtime-bindings/config/webpack.dev.js

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+//path is used to resolve properly across the OS
+const path = require('path');
+const { merge } = require('webpack-merge');
+const common = require('./webpack.common.js');
+//merge() calls in the environment-specific configuration to include commons
+module.exports = merge(common, {
+    //set development mode
+    mode: 'development',
+    //enable strong source mapping
+    devtool: 'inline-source-map',
+    devServer: {
+	static: path.resolve(__dirname, '../dist'),
+    },
+});

gtfs-realtime-bindings/config/webpack.prod.js

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+const { merge } = require('webpack-merge');
+const common = require('./webpack.common.js');
+module.exports = merge(common, {
+    mode: 'production',
+    //source maps encouraged in production
+    //choose mapping with fairly quick build speed like source-map
+    devtool: 'source-map',
+});

gtfs-realtime-bindings/package.json

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+{
+    "private": true,
+    "name": "react-example",
+    "description": "React.js example",
+    "version": "0.1.0",
+    "main": "index.js",
+    "keywords": [
+        "react",
+        "webpack"
+    ],
+    "author": "Software Ingenieur Begerad <dialog@SwIngBe.de>",
+    "license": "GPL-3.0-or-later",
+    "engines": {
+        "node": ">=10"
+    },
+    "scripts": {
+        "start": "webpack serve --config config/webpack.dev.js",
+        "build": "webpack --config config/webpack.prod.js"
+    },
+    "devDependencies": {
+        "@babel/core": "7.18.9",
+        "@babel/preset-env": "7.18.9",
+        "@babel/preset-react": "7.18.6",
+        "babel-loader": "8.2.5",
+        "css-loader": "6.7.1",
+        "html-webpack-plugin": "5.5.0",
+        "style-loader": "3.3.1",
+        "webpack": "5.73.0",
+        "webpack-cli": "4.10.0",
+        "webpack-dev-server": "4.9.3",
+        "webpack-merge": "5.8.0"
+    },
+    "dependencies": {
+        "axios": "0.27.2",
+        "gtfs-realtime-bindings": "0.0.6",
+        "prop-types": "15.8.1",
+        "react": "18.2.0",
+        "react-dom": "18.2.0"
+    }
+}

gtfs-realtime-bindings/public/index.html

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+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="UTF-8">
+    <title>React Example</title>
+  </head>
+  <body>
+    <div id="root"></div>
+  </body>
+</html>