feat(gtfs-service): initial commit

gtfs-service/.env

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+NODE_ENV=development
+#URL=https://soll.vbn.de/gtfs/servicedays?routeshortname=411
+URL=http://localhost:65534/servicedays?routeshortname=411

gtfs-service/README.md

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+## Overview
+
+tbc
+
+## Preparation
+Run the following command in your favorite terminal to install dependenies.
+```
+npm i
+```
+## Development setup
+Run the following command in your favorite terminal if you fancy log messages for debugging.
+```
+export DEBUG=$DEBUG,debug,gtfs-service
+```
+Run the following command in your favorite terminal to start the service in development mode.
+```
+npm run dev
+```
+## Production deployment
+
+tbc

gtfs-service/gtfs-service.js

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+require('dotenv').config();
+const axios=require('axios');
+const debug=require('debug')('gtfs-service');
+
+/*check if http get service day response includes data*/
+function hasData(res){
+    if('data' in res){
+	debug('data in response available');
+	return true;
+    }else{
+	debug('data in response NOT available');
+	return false;
+    }
+}
+
+/*provide http get service day response and get trip array*/
+function getAryTripCount(res){
+    if(hasData(res)){
+	const objService=res.data;
+        const aryService=Object.entries(objService);
+	const aryTripCount=aryService.map(trip=>{
+	    const aryTrip=Object.keys(trip[1]);
+	    return aryTrip.length;
+	});
+	return aryTripCount;
+    }
+}
+
+/*provide http get service day response and get time array*/
+function getAryTime(res){
+    if(hasData(res)){
+	const objService=res.data;
+        const aryService=Object.entries(objService);
+	const arrTime=aryService.map((trips, key) => {
+	    //debug('key: ' + key);
+            let time = parseInt(trips[0], 10);
+            //debug('time: ' + time);
+	    return time;
+        });
+	return arrTime;
+    }
+};
+
+module.exports={
+    getAryTime,
+    getAryTripCount
+};

gtfs-service/index.js

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+require('dotenv').config();
+const axios=require('axios');
+const debug=require('debug')('debug');
+const GtfsService=require('./gtfs-service');
+
+const URL=process.env.URL;
+debug('URL: '+URL)
+
+run().catch(err => {
+    debug('run: error')
+    console.log(err)
+});
+
+async function run() {
+    debug('run started...')
+    const res = await axios.get(URL);
+    debug('res: '+res);
+    const aryTripCount=GtfsService.getAryTripCount(res);
+    debug('aryTripCount len: '+aryTripCount.length);
+    debug('aryTripCount [0]: '+aryTripCount[0]);
+    const aryTime=GtfsService.getAryTime(res);
+    debug('aryTime len: '+aryTime.length);
+    debug('aryTime [0]: '+aryTime[0]);
+    debug('run done.')
+}

gtfs-service/package.json

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+{
+    "name": "gtfs-service",
+  "version": "0.0.1",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "dev": "nodemon index.js",
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "author": "Stefan Begerad",
+  "license": "GPL-3.0",
+  "devDependencies": {
+    "nodemon": "^2.0.7"
+  },
+  "dependencies": {
+    "axios": "^0.21.1",
+    "dotenv": "^8.2.0"
+  }
+}

gtfs-service/utils.js

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+const debug=require('debug')('utils');
+
+function findSubStr(str, start, end) {
+    var index = str.slice(start, end);
+    //debug('index: '+index);
+    return index;
+}
+  
+function gtfsDate2NodeDate(date){
+    let start = 0;
+    let end = 4;
+    let year=findSubStr(date, start, end);
+    //debug('year: '+year);
+    start=4;
+    end=6;
+    let month=findSubStr(date, start, end);
+    //debug('month: '+month);
+    start=6;
+    end=8;
+    let day=findSubStr(date, start, end);
+    //debug('day: '+day);
+    let nodeDate = new Date(year, month - 1, day);
+    //debug('nodeDate: '+nodeDate);
+    return nodeDate;
+}
+
+const dateWeekday={
+    sunday:0,
+    monday:1,
+    tuesday:2,
+    wednesday:3,
+    thursday:4,
+    friday:5,
+    saturday:6
+}
+
+function nextDay(epoch){
+    debug('epoch: '+epoch);
+    let epochNext=epoch + (24 * 60 * 60 * 1000) // 1 day in millisecond
+    debug('epochNext: '+epochNext);
+    return epochNext;
+}
+
+module.exports={
+    gtfsDate2NodeDate,
+    nextDay,
+    dateWeekday
+};