feat: initial commit

2023-12-14 21:20:28 +01:00 · 2023-12-14 21:20:28 +01:00 · 1b01fafe28
parent 422aded7b1
commit 1b01fafe28
7 changed files with 877 additions and 0 deletions
--- a/index.js
+++ b/index.js
@ -0,0 +1,170 @@
+require('dotenv').config();
+const fs = require('fs');
+const debug=require('debug')('debug');
+
+const Pbf = require('pbf');
+
+const db = require('./src/db');
+
+const tUO = require('./src/trip-update-obj');
+
+const gtfsRt=require('../proto2js/js/gtfs-rt.js');
+
+const file=process.env.file||'file';
+debug('file: '+file)
+
+const FeedMessage = gtfsRt.FeedMessage;
+
+debug('start...');
+
+//initialize array of trip update objects
+const rryOfTripUpdateObjcs = new Array();
+
+const buffer=fs.readFileSync(file);
+if(buffer instanceof Buffer){
+
+    debug('buffer is instance of Buffer');
+
+    const pbf = new Pbf(buffer);
+
+    const feed = FeedMessage.read(pbf);
+
+    let countTrip = 0;
+    let countTripId = 0;
+    let countRouteId = 0;
+    let countTimestamp = 0;
+    let countDelay = 0;
+
+    feed.entity.forEach(entity => {
+        const entityTripUpdate = entity.trip_update;
+	if (entityTripUpdate !== null && entityTripUpdate !== undefined) {
+
+	    const tuo = new tUO.TripUpdate();
+	    const trip = entityTripUpdate.trip;
+
+	    if (trip !== null && trip !== undefined) {
+
+		countTrip++
+		const t = new tUO.Trip();
+		const tripId = trip.trip_id;
+		if (tripId !== null && tripId !== undefined) {
+		    countTripId++;
+		    t.tripId = tripId;
+		}
+
+		const routeId = trip.route_id;
+		if (routeId !== null && routeId !== undefined) {
+		    countRouteId++;
+		    t.routeId = routeId;
+		}
+
+		//create a copy of an object, you can use the spread operator
+		tuo.trip = {...t};
+	    }
+
+	    const timestamp = entityTripUpdate.timestamp;
+	    if (timestamp !== null && timestamp !== undefined) {
+		countTimestamp++;
+		tuo.timestamp = timestamp;
+	    }
+
+	    const delay = entityTripUpdate.delay;
+	    if (delay !== null && delay !== undefined) {
+		countDelay++;
+		tuo.delay = delay;
+	    }
+	    rryOfTripUpdateObjcs.push({...tuo});
+	}
+    });
+
+    //TODO clean up
+    debug('index:intervalFunc(): rryOfTripUpdateObjcs.length: ' + rryOfTripUpdateObjcs.length);
+    debug('index:intervalFunc(): countTrip: ' + countTrip);
+    debug('index:intervalFunc(): countTripId: ' + countTripId);
+    debug('index:intervalFunc(): countRouteId: ' + countRouteId);
+    debug('index:intervalFunc(): countTimeStamp: ' + countTimestamp);
+    debug('index:intervalFunc(): countDelay: ' + countDelay);
+
+}else{
+    console.error('ERROR: buffer is NOT instance of Buffer');
+}
+
+
+async function run() {
+    debug('index:run(): started...');
+//select trip updates of today from db as array of objects
+
+const schema = process.env.DB_SCHEMA || 'schema';
+
+
+//TODO some GTFSR feeds do not provide timestamp const query = 'SELECT * FROM ' + schema + '.trip_updates WHERE timestamp_gtfsr >= current_date';
+
+//NOTE: https://www.postgresql.org/docs/current/functions-datetime.html#FUNCTIONS-DATETIME-CURRENT
+
+const query = 'SELECT * FROM ' + schema + '.trip_updates WHERE timestamp_pgsql >= current_date';
+debug('query: '+query);
+
+const rsp = await db.query(query);
+debug('rsp.length: '+rsp.length);
+
+if (rsp !== null && rsp !== undefined && rsp.length < 0) {
+    //TODO clean up
+    debug('rsp[0]: ' + JSON.stringify(rsp[0]));
+}
+
+//TODO only continue if rsp is neither null or undefined
+
+//transform array of objects into map [trip_trip_id, trip update object]
+//TODO handle rsp NOT available
+const mapDbTripUpdates = new Map();
+rsp.forEach(element => {
+    mapDbTripUpdates.set(element.trip_trip_id, element);
+});
+
+    debug('mapDbTripUpdates.size: ' + mapDbTripUpdates.size);
+
+    //compare map from db with array of trip update objcs from GTFS Realtime feed
+    //TODO clean up
+    let countRryElem = 0;
+    let countInsert = 0;
+    //TODO https://stackoverflow.com/a/37576787/15078958
+    //TODO according to this link forEach() has challenges for async/await
+    for (const element of rryOfTripUpdateObjcs) {
+	const value = mapDbTripUpdates.get(element.trip.tripId);
+	let query = '';
+	let rspPsql = null;
+
+	if (value === undefined) {
+	    query = `INSERT INTO `
+		+ schema
+		+ `.trip_updates (trip_trip_id, trip_route_id, timestamp_gtfsr, delay) VALUES ('`
+		+ element.trip.tripId
+		+ `', '`
+		+ element.trip.routeId
+		+ `', to_timestamp(`
+		+ element.timestamp
+		+ `), '`
+		+ element.delay
+		+ `');`;
+	    rspPsql = await db.query(query);
+	    countInsert++;
+
+	    if (countRryElem === 0) {
+	    debug('value: ' + JSON.stringify(value));
+	    debug('query: ' + query);
+	    debug('respDb: ' + JSON.stringify(rspPsql));
+	    }
+	    countRryElem++;
+	}
+    }
+
+    debug('countInsert: ' + countInsert);
+
+    //other
+    debug('index:run(): done.');
+};
+
+run().catch(err => {
+    console.error('ERROR: ');
+    console.log(err)
+});
--- a/package-lock.json
+++ b/package-lock.json
@ -0,0 +1,612 @@
+{
+  "name": "gtfsr2pgsql",
+  "version": "1.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "gtfsr2pgsql",
+      "version": "1.0.0",
+      "license": "GPL-3.0-or-later",
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+      }
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+    "node_modules/undefsafe": {
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+      "dev": true
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+    "node_modules/xtend": {
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+      "engines": {
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+    },
+    "node_modules/yallist": {
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+      "resolved": "https://registry.npmjs.org/yallist/-/yallist-4.0.0.tgz",
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+      "dev": true
+    }
+  }
+}
--- a/package.json
+++ b/package.json
@ -0,0 +1,22 @@
+{
+  "private": true,
+  "name": "gtfsr2pgsql",
+  "version": "1.0.0",
+  "description": "GTFS Realtime to PostgreSQL",
+  "main": "index.js",
+  "scripts": {
+    "dev": "nodemon index.js",
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "author": "Software Ingenieur Begerad <dialog@SwIngBe.de>",
+  "license": "GPL-3.0-or-later",
+  "devDependencies": {
+    "debug": "4.3.4",
+    "nodemon": "3.0.2"
+  },
+  "dependencies": {
+    "dotenv": "16.3.1",
+    "pbf": "3.2.1",
+    "pg": "8.11.3"
+  }
+}
--- a/readme.md
+++ b/readme.md
@ -0,0 +1,11 @@
+# Preparation
+
+```
+npm i
+```
+
+# Test
+
+```
+DEBUG=config,debug npm run dev
+```
--- a/src/config.js
+++ b/src/config.js
@ -0,0 +1,22 @@
+const DEBUG=require('debug')('config');
+DEBUG('config start...');
+
+require('dotenv').config();
+
+const config = {
+  db: { /* do not put password or any sensitive info here, done only for demo */
+      host: process.env.DB_HOST || 'host',
+      port: process.env.DB_PORT || '5432',
+      user: process.env.DB_USER || 'usr',
+      password: process.env.DB_PASSWORD || 'key',
+      database: process.env.DB_NAME || 'db',
+  },
+  listPerPage: process.env.LIST_PER_PAGE || 10,
+};
+
+DEBUG('config host: '+config.db.host);
+DEBUG('config port: '+config.db.port);
+DEBUG('config user: '+config.db.user);
+DEBUG('config database: '+config.db.database);
+module.exports = config;
+DEBUG('config done.');
--- a/src/db.js
+++ b/src/db.js
@ -0,0 +1,22 @@
+const { Pool } = require('pg');
+
+const config = require('./config');
+
+const pool = new Pool(config.db);
+
+/**
+ * Query the database using the pool
+ * @param {*} query 
+ * @param {*} params 
+ * 
+ * @see https://node-postgres.com/features/pooling#single-query
+ */
+async function query(query, params) {
+    const {rows, fields} = await pool.query(query, params);
+
+    return rows;
+};
+
+module.exports = {
+  query
+};
--- a/src/trip-update-obj.js
+++ b/src/trip-update-obj.js
@ -0,0 +1,18 @@
+//Object Constructor
+function Trip(tripId = '', routeId = '') {
+    this.tripId = tripId; 
+    this.routeId = routeId; 
+};
+
+
+//Object Constructor
+function TripUpdate(trip = null, timestamp = 0, delay = 0) {
+    this.trip = trip; 
+    this.timestamp = timestamp; 
+    this.delay = delay; 
+};
+
+module.exports={
+    Trip,
+    TripUpdate
+};