302 lines
9.2 KiB
JavaScript
302 lines
9.2 KiB
JavaScript
'use strict';
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var async = require('async'),
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advancedPool = require('advanced-pool'),
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crypto = require('crypto'),
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fs = require('fs'),
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path = require('path'),
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util = require('util'),
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zlib = require('zlib');
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var clone = require('clone'),
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express = require('express'),
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mercator = new (require('sphericalmercator'))(),
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mbgl = require('mapbox-gl-native'),
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mbtiles = require('mbtiles'),
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request = require('request'),
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sharp = require('sharp');
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var utils = require('./utils');
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var FLOAT_PATTERN = '[+-]?(?:\\d+|\\d+\.?\\d+)';
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var SCALE_PATTERN = '@[23]x';
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var getScale = function(scale) {
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return (scale || '@1x').slice(1, 2) | 0;
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};
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mbgl.on('message', function(e) {
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if (e.severity == 'WARNING' || e.severity == 'ERROR') {
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console.log('mbgl:', e);
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}
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});
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module.exports = function(maps, options, prefix) {
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var app = express().disable('x-powered-by'),
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domains = options.domains,
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tilePath = '/{z}/{x}/{y}.{format}';
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var rootPath = path.join(process.cwd(), options.root || '');
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var styleUrl = options.style;
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var map = {
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renderers: [],
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sources: {},
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tileJSON: {}
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};
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var styleJSON;
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var createPool = function(ratio, min, max) {
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var createRenderer = function(ratio, createCallback) {
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var renderer = new mbgl.Map({
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ratio: ratio,
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request: function(req, callback) {
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var protocol = req.url.split(':')[0];
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//console.log('Handling request:', req);
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if (protocol == req.url) {
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fs.readFile(path.join(rootPath, unescape(req.url)), function(err, data) {
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callback(err, { data: data });
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});
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} else if (protocol == 'mbtiles') {
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var parts = req.url.split('/');
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var source = map.sources[parts[2]];
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var z = parts[3] | 0,
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x = parts[4] | 0,
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y = parts[5].split('.')[0] | 0;
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source.getTile(z, x, y, function(err, data, headers) {
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if (err) {
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//console.log('MBTiles error, serving empty', err);
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callback(null, { data: new Buffer(0) });
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} else {
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var response = {};
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if (headers['Last-Modified']) {
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response.modified = new Date(headers['Last-Modified']);
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}
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if (headers['ETag']) {
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response.etag = headers['ETag'];
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}
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response.data = zlib.unzipSync(data);
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callback(null, response);
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}
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});
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} else if (protocol == 'http' || protocol == 'https') {
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request({
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url: req.url,
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encoding: null,
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gzip: true
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}, function(err, res, body) {
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if (err) {
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//console.log('HTTP tile error', err);
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callback(null, { data: new Buffer(0) });
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} else if (res.statusCode == 200) {
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var response = {};
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if (res.headers.modified) {
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response.modified = new Date(res.headers.modified);
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}
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if (res.headers.expires) {
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response.expires = new Date(res.headers.expires);
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}
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if (res.headers.etag) {
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response.etag = res.headers.etag;
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}
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response.data = body;
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callback(null, response);
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} else {
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//console.log('HTTP error', JSON.parse(body).message);
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callback(null, { data: new Buffer(0) });
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}
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});
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}
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}
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});
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renderer.load(styleJSON);
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createCallback(null, renderer);
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};
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return new advancedPool.Pool({
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min: min,
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max: max,
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create: createRenderer.bind(null, ratio),
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destroy: function(renderer) {
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renderer.release();
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}
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});
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};
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styleJSON = require(path.join(rootPath, styleUrl));
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map.tileJSON = {
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'tilejson': '2.0.0',
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'name': styleJSON.name,
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'basename': prefix.substr(1),
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'minzoom': 0,
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'maxzoom': 20,
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'bounds': [-180, -85.0511, 180, 85.0511],
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'format': 'png',
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'type': 'baselayer'
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};
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Object.assign(map.tileJSON, options.options || {});
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var queue = [];
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Object.keys(styleJSON.sources).forEach(function(name) {
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var source = styleJSON.sources[name];
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var url = source.url;
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if (url.lastIndexOf('mbtiles:', 0) === 0) {
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// found mbtiles source, replace with info from local file
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delete source.url;
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queue.push(function(callback) {
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var mbtilesUrl = url.substring('mbtiles://'.length);
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map.sources[name] = new mbtiles(path.join(rootPath, mbtilesUrl), function(err) {
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map.sources[name].getInfo(function(err, info) {
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Object.assign(source, info);
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source.basename = name;
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source.tiles = [
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// meta url which will be detected when requested
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'mbtiles://' + name + tilePath.replace('{format}', 'pbf')
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];
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callback(null);
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});
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});
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});
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}
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});
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async.parallel(queue, function(err, results) {
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// TODO: make pool sizes configurable
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map.renderers[1] = createPool(1, 4, 16);
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map.renderers[2] = createPool(2, 2, 8);
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map.renderers[3] = createPool(3, 2, 4);
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});
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maps[prefix] = map;
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var tilePattern = tilePath
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.replace(/\.(?!.*\.)/, ':scale(' + SCALE_PATTERN + ')?.')
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.replace(/\./g, '\.')
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.replace('{z}', ':z(\\d+)')
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.replace('{x}', ':x(\\d+)')
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.replace('{y}', ':y(\\d+)')
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.replace('{format}', ':format([\\w\\.]+)');
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var respondImage = function(z, lon, lat, width, height, scale, format, res, next) {
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if (format == 'png' || format == 'webp') {
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} else if (format == 'jpg' || format == 'jpeg') {
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format = 'jpeg';
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} else {
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return res.status(404).send('Invalid format');
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}
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var pool = map.renderers[scale];
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pool.acquire(function(err, renderer) {
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var mbglZ = Math.max(0, z - 1);
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var params = {
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zoom: mbglZ,
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center: [lon, lat],
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width: width,
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height: height
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};
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if (z == 0) {
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params.width *= 2;
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params.height *= 2;
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}
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renderer.render(params, function(err, data) {
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pool.release(renderer);
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if (err) console.log(err);
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var image = sharp(data, {
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raw: {
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width: params.width * scale,
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height: params.height * scale,
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channels: 4
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}
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});
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if (z == 0) {
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// HACK: when serving zoom 0, resize the 0 tile from 512 to 256
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image.resize(width * scale, height * scale);
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}
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image.toFormat(format)
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.compressionLevel(9)
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.toBuffer(function(err, buffer, info) {
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if (!buffer) {
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return res.status(404).send('Not found');
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}
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var md5 = crypto.createHash('md5').update(buffer).digest('base64');
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res.set({
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'content-md5': md5,
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'content-type': 'image/' + format
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});
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return res.status(200).send(buffer);
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});
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});
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});
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};
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app.get(tilePattern, function(req, res, next) {
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var z = req.params.z | 0,
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x = req.params.x | 0,
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y = req.params.y | 0,
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scale = getScale(req.params.scale),
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format = req.params.format;
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var tileSize = 256;
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var tileCenter = mercator.ll([
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((x + 0.5) / (1 << z)) * (256 << z),
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((y + 0.5) / (1 << z)) * (256 << z)
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], z);
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return respondImage(z, tileCenter[0], tileCenter[1], tileSize, tileSize,
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scale, format, res, next);
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});
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var staticPattern =
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'/static/%s:scale(' + SCALE_PATTERN + ')?\.:format([\\w\\.]+)';
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var centerPattern =
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util.format(':lon(%s),:lat(%s),:z(\\d+)/:width(\\d+)x:height(\\d+)',
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FLOAT_PATTERN, FLOAT_PATTERN);
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app.get(util.format(staticPattern, centerPattern), function(req, res, next) {
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var z = req.params.z | 0,
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x = +req.params.lon,
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y = +req.params.lat,
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w = req.params.width | 0,
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h = req.params.height | 0,
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scale = getScale(req.params.scale),
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format = req.params.format;
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return respondImage(z, x, y, w, h, scale, format, res, next);
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});
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var boundsPattern =
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util.format(':minx(%s),:miny(%s),:maxx(%s),:maxy(%s)/:z(\\d+)',
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FLOAT_PATTERN, FLOAT_PATTERN, FLOAT_PATTERN, FLOAT_PATTERN);
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app.get(util.format(staticPattern, boundsPattern), function(req, res, next) {
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var z = req.params.z | 0,
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x = ((+req.params.minx) + (+req.params.maxx)) / 2,
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y = ((+req.params.miny) + (+req.params.maxy)) / 2,
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w = req.params.width | 0,
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h = req.params.height | 0,
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scale = getScale(req.params.scale),
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format = req.params.format;
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return respondImage(z, x, y, w, h, scale, format, res, next);
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});
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app.get('/index.json', function(req, res, next) {
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var info = clone(map.tileJSON);
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info.tiles = utils.getTileUrls(req.protocol, domains, req.headers.host,
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prefix, tilePath, info.format,
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req.query.key);
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return res.send(info);
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});
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return app;
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};
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