Retrieve whole network and start of realtime
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198
back/data.js
198
back/data.js
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@ -1,198 +0,0 @@
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const requestp = require('request-promise-native');
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const {makeCached} = require('./util');
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const OVERPASS_ENDPOINT = 'https://lz4.overpass-api.de/api/interpreter';
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const fetchLineData = makeCached(async (lineRef) =>
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{
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// Retrieve routes, ways and stops from OpenStreetMap
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const rawData = await requestp.post(OVERPASS_ENDPOINT, {form: `\
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data=[out:json];
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// Find the public transport line bearing the requested reference
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relation[network="TaM"][type="route_master"][ref="${lineRef}"];
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// Recursively fetch routes, ways and stops inside the line
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(._; >>;);
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out body qt;
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`});
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const elementsList = JSON.parse(rawData).elements;
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// Extract all routes for the given line
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const rawRoutes = elementsList.filter(elt =>
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elt.type === 'relation'
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&& elt.tags.type === 'route'
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&& elt.tags.ref === lineRef
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);
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// If no route is found, assume the line does not exist
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if (rawRoutes.length === 0)
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{
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return null;
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}
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// Index retrieved objects by their ID
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const elements = elementsList.reduce((prev, elt) =>
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{
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prev[elt.id] = elt;
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return prev;
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}, {});
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const color = rawRoutes[0].tags.colour || '#000000';
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// Extract stops for each route of the line
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const routes = rawRoutes.map(route => ({
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from: route.tags.from,
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to: route.tags.to,
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// Retrieve each stop’s information (stop order in the relation is
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// assumed to reflect reality)
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stops: route.members
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.filter(({role}) => role === 'stop')
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.map(({ref}) => {
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const elt = elements[ref];
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return {
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id: ref,
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lat: elt.lat,
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lon: elt.lon,
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name: elt.tags.name,
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};
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}),
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// List of ways making up the route (raw)
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rawWays: route.members
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.filter(({role}) => role === '')
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.map(({ref}) => ref)
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}));
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// Process ways in each route to sort and merge them
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for (let route of routes)
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{
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const {from, to, stops, rawWays} = route;
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// Construct a graph with all connected nodes
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const nodeNeighbors = new Map();
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for (let id of rawWays)
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{
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const {type, nodes, tags} = elements[id];
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const isOneWay = (
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tags.oneway === 'yes'
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|| tags.junction === 'roundabout'
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);
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const canGoBackward = (
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!isOneWay
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|| parseInt(tags['lanes:psv:backward'], 10) > 0
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);
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if (type === 'way' && nodes.length >= 1)
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{
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let previousNode = nodes[0];
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if (!nodeNeighbors.has(previousNode))
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{
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nodeNeighbors.set(previousNode, new Set());
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}
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for (let node of nodes.slice(1))
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{
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if (!nodeNeighbors.has(node))
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{
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nodeNeighbors.set(node, new Set());
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}
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nodeNeighbors.get(previousNode).add(node);
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if (canGoBackward)
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{
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nodeNeighbors.get(node).add(previousNode);
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}
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previousNode = node;
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}
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}
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}
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// Find way from first stop through the end using DFS
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const numberOfStops = stops.length;
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const ways = [];
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let currentStopIndex = 0;
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while (currentStopIndex + 1 < numberOfStops)
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{
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const currentStop = stops[currentStopIndex];
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const nextStop = stops[currentStopIndex + 1];
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const visitedEdges = new Set();
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const stack = [{
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currentNode: currentStop.id,
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way: [currentStop.id],
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}];
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let found = false;
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while (stack.length !== 0)
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{
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const {currentNode, way} = stack.pop();
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if (currentNode === nextStop.id)
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{
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// Arrived at next stop
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ways.push(way);
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found = true;
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break;
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}
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const neighbors = nodeNeighbors.get(currentNode) || [];
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for (let nextNode of neighbors)
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{
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const edge = `${currentNode}-${nextNode}`;
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if (!visitedEdges.has(edge))
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{
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visitedEdges.add(edge);
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stack.push({
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currentNode: nextNode,
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way: way.concat([nextNode]),
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});
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}
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}
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}
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if (!found)
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{
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throw new Error(`No way between stop “${currentStop.name}” \
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(${currentStop.id}) and stop “${nextStop.name}” (${nextStop.id}) on line \
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${lineRef}’s route from “${from}” to “${to}”`);
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}
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++currentStopIndex;
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}
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// Only keep geo coordinates for each way node
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route.ways = ways.map(way =>
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way.map(id =>
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{
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const node = elements[id];
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return {lat: node.lat, lon: node.lon};
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})
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);
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delete route.rawWays;
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}
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return {
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ref: lineRef,
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color,
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routes
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};
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});
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exports.fetchLineData = fetchLineData;
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@ -0,0 +1,254 @@
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const requestp = require('request-promise-native');
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const geolib = require('geolib');
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const {makeCached} = require('../util');
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const OVERPASS_ENDPOINT = 'https://lz4.overpass-api.de/api/interpreter';
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const fetch = makeCached(async (lineRefs) =>
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{
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// Retrieve routes, ways and stops from OpenStreetMap
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const rawData = await requestp.post(OVERPASS_ENDPOINT, {form: `\
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data=[out:json];
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// Find the public transport line bearing the requested reference
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relation[network="TaM"][type="route_master"][ref~"^(${lineRefs.join('|')})$"];
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// Recursively fetch routes, ways and stops inside the line
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(._; >>;);
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out body qt;
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`});
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// List of retrieved objects
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const elementsList = JSON.parse(rawData).elements;
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// List of retrieved lines
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const routeMasters = elementsList.filter(elt =>
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elt.tags && elt.tags.type === 'route_master'
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);
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// Retrieved objects indexed by ID
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const elements = elementsList.reduce((prev, elt) =>
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{
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prev[elt.id] = elt;
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return prev;
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}, {});
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// Result object containing all stops
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const stops = {};
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// Result object containing all segments between stops
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const segments = {};
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// Result object containing all lines
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const lines = {};
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for (let routeMaster of routeMasters)
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{
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const lineRef = routeMaster.tags.ref;
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const color = routeMaster.tags.colour || '#000000';
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// Extract all routes for the given line
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const rawRoutes = routeMaster.members.map(({ref}) => elements[ref]);
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// Add missing stops to the result object
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for (let route of rawRoutes)
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{
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for (let {ref, role} of route.members)
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{
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if (role === 'stop')
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{
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const stop = elements[ref];
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if (!('ref' in stop.tags))
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{
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console.warn(`Stop ${stop.id} is missing a “ref” tag`);
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continue;
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}
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if (!(stop.tags.ref in stops))
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{
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stops[stop.tags.ref] = {
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lat: stop.lat,
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lon: stop.lon,
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name: stop.tags.name,
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lines: [lineRef],
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};
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}
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else
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{
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stops[stop.tags.ref].lines.push(lineRef);
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}
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}
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}
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}
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// Add missing segments between stops
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for (let route of rawRoutes)
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{
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const {from, to} = route.tags;
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const stops = route.members
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.filter(({role}) => role === 'stop')
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.map(({ref}) => elements[ref])
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.filter(stop => 'ref' in stop.tags)
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.map(stop => ({
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id: stop.id,
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lat: stop.lat,
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lon: stop.lon,
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ref: stop.tags.ref,
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name: stop.tags.name,
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}));
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const ways = route.members
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.filter(({role}) => role === '')
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.map(({ref}) => ref);
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// Construct a graph with all connected nodes
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const nodeNeighbors = new Map();
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for (let id of ways)
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{
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const {type, nodes, tags} = elements[id];
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const isOneWay = (
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tags.oneway === 'yes'
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|| tags.junction === 'roundabout'
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);
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const canGoBackward = (
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!isOneWay
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|| parseInt(tags['lanes:psv:backward'], 10) > 0
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);
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if (type === 'way' && nodes.length >= 1)
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{
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let previousNode = nodes[0];
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if (!nodeNeighbors.has(previousNode))
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{
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nodeNeighbors.set(previousNode, new Set());
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}
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for (let node of nodes.slice(1))
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{
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if (!nodeNeighbors.has(node))
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{
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nodeNeighbors.set(node, new Set());
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}
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nodeNeighbors.get(previousNode).add(node);
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if (canGoBackward)
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{
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nodeNeighbors.get(node).add(previousNode);
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}
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previousNode = node;
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}
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}
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}
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// Find way from first stop through the end using DFS
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const numberOfStops = stops.length;
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let currentStopIndex = 0;
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while (currentStopIndex + 1 < numberOfStops)
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{
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const currentStop = stops[currentStopIndex];
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const nextStop = stops[currentStopIndex + 1];
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const segmentId = `${currentStop.ref}-${nextStop.ref}`;
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if (!(segmentId in segments))
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{
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const visitedEdges = new Set();
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const stack = [{
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currentNode: currentStop.id,
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segment: [currentStop.id],
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}];
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let found = false;
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while (stack.length !== 0)
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{
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const {currentNode, segment} = stack.pop();
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if (currentNode === nextStop.id)
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{
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// Arrived at next stop
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segments[segmentId] = {
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nodes: segment.map(id =>
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{
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const {lat, lon} = elements[id];
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return {lat, lon};
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}),
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length: geolib.getPathLength(segment.map(id =>
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{
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const {lat, lon} = elements[id];
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return {latitude: lat, longitude: lon};
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})),
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lines: [lineRef],
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};
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found = true;
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break;
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}
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const neighbors = nodeNeighbors.get(currentNode) || [];
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for (let nextNode of neighbors)
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{
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const edge = `${currentNode}-${nextNode}`;
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if (!visitedEdges.has(edge))
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{
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visitedEdges.add(edge);
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stack.push({
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currentNode: nextNode,
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segment: segment.concat([nextNode]),
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});
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}
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}
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}
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if (!found)
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{
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throw new Error(`No way between stop \
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“${currentStop.name}” (${currentStop.id}) and stop “${nextStop.name}” \
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(${nextStop.id}) on line ${lineRef}’s route from “${from}” to “${to}”`);
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}
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}
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else
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{
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segments[segmentId].lines.push(lineRef);
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}
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++currentStopIndex;
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}
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}
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// Construct line objects
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const routes = rawRoutes.map(route => ({
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from: route.tags.from,
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to: route.tags.to,
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// Retrieve each stop’s information (stop order in the relation is
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// assumed to reflect reality)
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stops: route.members
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.filter(({role}) => role === 'stop')
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.map(({ref}) => elements[ref])
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.filter(stop => 'ref' in stop.tags)
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.map(stop => stop.tags.ref)
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}));
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lines[lineRef] = {
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color,
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routes
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};
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}
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return {stops, segments, lines};
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});
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exports.fetch = fetch;
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@ -0,0 +1,172 @@
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const request = require('request');
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const csv = require('csv-parse');
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const network = require('./network');
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const TAM_REALTIME = 'http://data.montpellier3m.fr/node/10732/download';
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const sortByFirstKey = (a, b) => a[0] - b[0];
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const fetchRealtime = () => new Promise((res, rej) =>
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{
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const parser = csv({
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delimiter: ';',
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});
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const stream = request(TAM_REALTIME).pipe(parser);
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const courses = {};
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stream.on('readable', () =>
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{
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let row;
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while (row = stream.read())
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{
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if (row.length === 0 || row[0] === 'course')
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{
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// Ignore les lignes invalides et l’en-tête
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continue;
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}
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const course = row[0];
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const stopRef = row[2];
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const lineRef = row[4];
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const eta = row[9];
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const destinationRef = row[10];
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if (!(course in courses))
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{
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courses[course] = {
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lineRef,
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destinationRef,
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stops: [],
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};
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}
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courses[course].stops.push([parseInt(eta, 10), stopRef]);
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courses[course].stops.sort(sortByFirstKey);
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}
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});
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stream.on('end', () => res(courses));
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stream.on('error', err => rej(err));
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});
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const updateVehicles = async (lines, vehicles) =>
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{
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const courses = await fetchRealtime();
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const currentTime = Math.floor(Date.now() / 1000);
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for (let [courseRef, course] of Object.entries(courses))
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{
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if (course.lineRef in lines)
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{
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if (!(courseRef in vehicles))
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{
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// New vehicle: identify which route it pertains to
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const line = lines[course.lineRef];
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let routeIndex = null;
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for (let [index, route] of Object.entries(line.routes))
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{
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const destRef = route.stops[route.stops.length - 1].ref;
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if (destRef === course.destinationRef)
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{
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routeIndex = index;
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}
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}
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if (routeIndex !== null)
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{
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const route = line.routes[routeIndex];
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// Convert ETAs to absolute times
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const nextStops = course.stops.map(([eta, ref]) => [
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eta + currentTime,
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ref
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]);
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// Convert stop refs to indices
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const stopIndices = course.stops.map(([eta, ref]) => [
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eta,
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]);
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// Find the preceding stop from which the vehicle is coming
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const arrivingStop = stopIndices[0][1];
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const arrivingStopIndex =
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route.stops.findIndex(stop => stop.ref === arrivingStop);
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const [eta, nextStop] = stopIndices[0];
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if (nextStop === 0)
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{
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// Vehicle at starting point
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vehicles[courseRef] = {
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lineRef: course.lineRef,
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stopRef
|
||||
|
||||
stopIndex: 0,
|
||||
nextStops: stopIndices,
|
||||
|
||||
distance: 0,
|
||||
speed: 0,
|
||||
};
|
||||
}
|
||||
else
|
||||
{
|
||||
// Vehicle in transit between two stops
|
||||
vehicles[courseRef] = {
|
||||
lineRef: course.lineRef,
|
||||
routeIndex,
|
||||
|
||||
stopIndex: nextStop - 1,
|
||||
nextStops: stopIndices,
|
||||
|
||||
distance: 0,
|
||||
speed: route.distances[nextStop - 1] / eta,
|
||||
};
|
||||
}
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
// Existing vehicle: update information
|
||||
const vehicle = vehicles[courseRef];
|
||||
|
||||
const line = lines[vehicle.lineRef];
|
||||
const route = line.routes[vehicle.routeIndex];
|
||||
|
||||
// Convert stop refs to indices
|
||||
const stopIndices = course.stops.map(([eta, ref]) => [
|
||||
eta,
|
||||
route.stops.findIndex(stop => stop.ref === ref),
|
||||
]);
|
||||
|
||||
console.log(stopIndices);
|
||||
console.log(vehicle);
|
||||
console.log(course);
|
||||
console.log('---');
|
||||
}
|
||||
}
|
||||
}
|
||||
};
|
||||
|
||||
const sleep = time => new Promise(res => setTimeout(res, time));
|
||||
|
||||
const updateLoop = async (lines, vehicles = {}) =>
|
||||
{
|
||||
await updateVehicles(lines, vehicles);
|
||||
await sleep(30000);
|
||||
return updateLoop(lines, vehicles);
|
||||
};
|
||||
|
||||
(async () =>
|
||||
{
|
||||
const lines = {'1': await network.fetchLineData('1')};
|
||||
updateLoop(lines);
|
||||
|
||||
// console.log(require('util').inspect(vehicles, true, 10));
|
||||
})();
|
||||
|
|
@ -32,41 +32,31 @@ licenses/by-sa/2.0/">CC-BY-SA</a>`,
|
|||
const makeBorderColor = mainColor =>
|
||||
{
|
||||
const hsl = color(mainColor).hsl();
|
||||
|
||||
if (hsl.color[2] < 40)
|
||||
{
|
||||
hsl.color[2] += 30;
|
||||
}
|
||||
else
|
||||
{
|
||||
hsl.color[2] -= 20;
|
||||
}
|
||||
|
||||
hsl.color = Math.max(0, hsl.color[2] -= 20);
|
||||
return hsl.hex();
|
||||
};
|
||||
|
||||
const SERVER = window.origin;
|
||||
|
||||
fetch(SERVER + '/line/1').then(res => res.json()).then(line =>
|
||||
fetch(SERVER + '/network').then(res => res.json()).then(network =>
|
||||
{
|
||||
const color = line.color;
|
||||
Object.values(network.segments).forEach(segment =>
|
||||
{
|
||||
const color = network.lines[segment.lines[0]].color;
|
||||
const borderColor = makeBorderColor(color);
|
||||
const nodes = segment.nodes.map(({lat, lon}) => [lat, lon]);
|
||||
|
||||
L.polyline(nodes, {weight: 8, color: borderColor}).addTo(map);
|
||||
const line = L.polyline(nodes, {weight: 6, color}).addTo(map);
|
||||
|
||||
line.bindPopup(`${segment.length} m`);
|
||||
});
|
||||
|
||||
Object.values(network.stops).forEach(stop =>
|
||||
{
|
||||
const color = network.lines[stop.lines[0]].color;
|
||||
const borderColor = makeBorderColor(color);
|
||||
|
||||
line.routes.forEach(route =>
|
||||
{
|
||||
route.ways.forEach(way =>
|
||||
{
|
||||
const wayPoints = way.map(({lat, lon}) => [lat, lon]);
|
||||
|
||||
L.polyline(wayPoints, {weight: 8, color: borderColor}).addTo(map);
|
||||
L.polyline(wayPoints, {weight: 6, color}).addTo(map);
|
||||
});
|
||||
});
|
||||
|
||||
line.routes.forEach(route =>
|
||||
{
|
||||
route.stops.forEach(stop =>
|
||||
{
|
||||
const stopMarker = L.circleMarker(
|
||||
[stop.lat, stop.lon],
|
||||
{
|
||||
|
|
@ -80,5 +70,6 @@ fetch(SERVER + '/line/1').then(res => res.json()).then(line =>
|
|||
|
||||
stopMarker.bindPopup(stop.name);
|
||||
});
|
||||
});
|
||||
|
||||
console.log(network);
|
||||
});
|
||||
|
|
|
|||
|
|
@ -3616,6 +3616,11 @@
|
|||
"resolved": "https://registry.npmjs.org/gensync/-/gensync-1.0.0-beta.1.tgz",
|
||||
"integrity": "sha512-r8EC6NO1sngH/zdD9fiRDLdcgnbayXah+mLgManTaIZJqEC1MZstmnox8KpnI2/fxQwrp5OpCOYWLp4rBl4Jcg=="
|
||||
},
|
||||
"geolib": {
|
||||
"version": "3.2.1",
|
||||
"resolved": "https://registry.npmjs.org/geolib/-/geolib-3.2.1.tgz",
|
||||
"integrity": "sha512-O9nD8iSD4VimupKak8bKySLkkWI5VWetxIXsU7jmJRXxBFRR9LxSXGfTomtcHJLSRiznx+YHXHTOIVq4qgQmPw=="
|
||||
},
|
||||
"get-caller-file": {
|
||||
"version": "2.0.5",
|
||||
"resolved": "https://registry.npmjs.org/get-caller-file/-/get-caller-file-2.0.5.tgz",
|
||||
|
|
|
|||
|
|
@ -14,6 +14,7 @@
|
|||
"color": "^3.1.2",
|
||||
"csv-parse": "^4.8.3",
|
||||
"express": "^4.17.1",
|
||||
"geolib": "^3.2.1",
|
||||
"leaflet": "^1.6.0",
|
||||
"parcel-bundler": "^1.12.4",
|
||||
"request": "^2.88.0",
|
||||
|
|
|
|||
53
server.js
53
server.js
|
|
@ -1,65 +1,20 @@
|
|||
const express = require('express');
|
||||
const request = require('request');
|
||||
const csv = require('csv-parse');
|
||||
|
||||
const data = require('./back/data');
|
||||
const network = require('./back/data/network');
|
||||
|
||||
const app = express();
|
||||
const port = 3000;
|
||||
|
||||
app.use(express.static('dist'));
|
||||
|
||||
const TAM_REALTIME = 'http://data.montpellier3m.fr/node/10732/download';
|
||||
|
||||
app.get('/realtime', (req, res) =>
|
||||
{
|
||||
const parser = csv({
|
||||
delimiter: ';',
|
||||
});
|
||||
|
||||
passages = {};
|
||||
passagesLast = Date.now();
|
||||
|
||||
const stream = request(TAM_ENDPOINT)
|
||||
.pipe(parser);
|
||||
|
||||
stream.on('readable', () =>
|
||||
app.get('/network', async (req, res) =>
|
||||
{
|
||||
let row;
|
||||
|
||||
while (row = stream.read())
|
||||
{
|
||||
if (row.length === 0 || row[0] === 'course')
|
||||
{
|
||||
// Ignore les lignes invalides
|
||||
continue;
|
||||
}
|
||||
|
||||
if (passages[row[2]] === undefined)
|
||||
{
|
||||
passages[row[2]] = [];
|
||||
}
|
||||
|
||||
passages[row[2]].push({
|
||||
ligne: row[4],
|
||||
destination: row[5],
|
||||
direction: row[6],
|
||||
time: row[7],
|
||||
theorique: row[8],
|
||||
});
|
||||
}
|
||||
});
|
||||
|
||||
stream.on('end', () => res());
|
||||
stream.on('error', err => rej(err));
|
||||
|
||||
res.send('Hello World!');
|
||||
})
|
||||
|
||||
app.get('/line/:lineRef', async (req, res) =>
|
||||
{
|
||||
const lineData = await data.fetchLineData(req.params.lineRef);
|
||||
res.json(lineData);
|
||||
const networkData = await network.fetch(['1', '2', '3', '4']);
|
||||
res.json(networkData);
|
||||
});
|
||||
|
||||
app.listen(port, () => console.log(`Example app listening on port ${port}!`))
|
||||
|
|
|
|||
Loading…
Reference in New Issue