diff --git a/index.js b/index.js new file mode 100644 index 0000000..0646ac7 --- /dev/null +++ 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) +}); diff --git a/package-lock.json b/package-lock.json new file mode 100644 index 0000000..8ef8532 --- /dev/null +++ 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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"4.3.4", + "nodemon": "3.0.2" + }, + "dependencies": { + "dotenv": "16.3.1", + "pbf": "3.2.1", + "pg": "8.11.3" + } +} diff --git a/readme.md b/readme.md new file mode 100644 index 0000000..dd3f1db --- /dev/null +++ b/readme.md @@ -0,0 +1,11 @@ +# Preparation + +``` +npm i +``` + +# Test + +``` +DEBUG=config,debug npm run dev +``` diff --git a/src/config.js b/src/config.js new file mode 100644 index 0000000..46dc95b --- /dev/null +++ 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.'); diff --git a/src/db.js b/src/db.js new file mode 100644 index 0000000..518a3a5 --- /dev/null +++ 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 +}; diff --git a/src/trip-update-obj.js b/src/trip-update-obj.js new file mode 100644 index 0000000..a03291e --- /dev/null +++ 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 +};