tilestrata-mapnik/test/index.js

A TileStrata plugin for rendering tiles with mapnik

if (process.env.MAPNIK_FORK) {
	const moduleAlias = require('module-alias')
	moduleAlias.addAlias('mapnik', process.env.MAPNIK_FORK);
	moduleAlias();
}

var tilestrata = require('tilestrata');
var nodeMapnik = require('mapnik');
var TileServer = tilestrata.TileServer;
var TileRequest = tilestrata.TileRequest;
var imageSize = require('image-size');
var mapnik = require('../index.js');
var assert = require('chai').assert;
var fs = require('fs');
var isPng = require('is-png');

var fixtureSuffix = '-mapnik' + nodeMapnik.version.split('.')[0];

describe('Provider Implementation "mapnik"', function() {
	describe('serve()', function() {
		it('should render tile', function(done) {
			var server = new TileServer();
			var req = TileRequest.parse('/layer/0/0/0/tile.png');

			var provider = mapnik({ pathname: __dirname + '/data/test.xml' });
			assert.equal(provider.name, 'mapnik');
			provider.init(server, function(err) {
				if (err) throw err;
				provider.serve(server, req, function(err, buffer, headers) {
					if (err) throw err;
					assert.deepEqual(headers, {'Content-Type': 'image/png'});
					assert.instanceOf(buffer, Buffer);
					assert(isPng(buffer), 'Invalid png');

					// var fixturePath = __dirname + '/fixtures/world' + fixtureSuffix + '.png';
					// var im_actual = buffer.toString('base64');
					// if (process.env.UPDATE) fs.writeFileSync(fixturePath, buffer);
					// var im_expected = fs.readFileSync(fixturePath).toString('base64');
					// assert.equal(im_actual, im_expected);

					done();
				});
			});
		});
		it('should acknowledge "tileSize" option', function(done) {
			var server = new TileServer();
			var req = TileRequest.parse('/layer/0/0/0/tile.png');

			var provider = mapnik({ pathname: __dirname + '/data/test.xml', tileSize: 512, scale: 2 });
			provider.init(server, function(err) {
				if (err) throw err;
				provider.serve(server, req, function(err, buffer, headers) {
					if (err) throw err;
					assert.deepEqual(headers, {'Content-Type': 'image/png'});
					assert.instanceOf(buffer, Buffer);
					var resultSize = imageSize(buffer);
					assert.equal(resultSize.width, 512, 'actual width');
					assert.equal(resultSize.height, 512, 'actual height');
					done();
				});
			});
		});
		it('should render interactivity tiles', function(done) {
			var server = new TileServer();
			var req = TileRequest.parse('/layer/0/0/0/tile.json');

			var provider = mapnik({ pathname: __dirname + '/data/test.xml', interactivity: true });
			provider.init(server, function(err) {
				if (err) throw err;
				provider.serve(server, req, function(err, buffer, headers) {
					if (err) throw err;
					assert.deepEqual(headers, {'Content-Type': 'application/json'});
					assert.instanceOf(buffer, Buffer);

					var data_actual = buffer.toString('utf8');
					var fixturePath = __dirname + '/fixtures/world' + fixtureSuffix + '.json';
					if (process.env.UPDATE) fs.writeFileSync(fixturePath, buffer);
					var data_expected = fs.readFileSync(fixturePath, 'utf8');
					assert.deepEqual(JSON.parse(data_actual), JSON.parse(data_expected));

					done();
				});
			});
		});
		it('render a tile from a string of mapnik xml', function(done) {
			var xml = [];
			xml.push('<Map srs="+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0.0 +k=1.0 +units=m +nadgrids=@null +wktext +no_defs +over" background-color="#ffffff">');
				xml.push('<Parameters>');
					xml.push('<Parameter name="center">1.054687500000007,29.53522956294847,2</Parameter>');
					xml.push('<Parameter name="interactivity_layer">world</Parameter>');
					xml.push('<Parameter name="interactivity_fields">NAME</Parameter>');
					xml.push('<Parameter name="template"><![CDATA[<b>{{NAME}}</b>]]></Parameter>');
				xml.push('</Parameters>');
				xml.push('<Style name="world">');
					xml.push('<Rule>');
						xml.push('<PolygonSymbolizer fill="#eeeeee" clip="true" />');
						xml.push('<LineSymbolizer stroke="#cccccc" stroke-width="0.5" clip="true" />');
					xml.push('</Rule>');
				xml.push('</Style>');
				xml.push('<Layer name="world" srs="+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0.0 +k=1.0 +units=m +nadgrids=@null +wktext +no_defs +over">');
					xml.push('<StyleName>world</StyleName>');
					xml.push('<Datasource>');
						xml.push('<Parameter name="file">test/data/world_merc/world_merc</Parameter>');
						xml.push('<Parameter name="type">shape</Parameter>');
					xml.push('</Datasource>');
				xml.push('</Layer>');
			xml.push('</Map>');

			var server = new TileServer();
			var req = TileRequest.parse('/layer/0/0/0/tile.png');

			var provider = mapnik({
				xml: xml.join('')
			});
			provider.init(server, function(err) {
				if (err) throw err;
				provider.serve(server, req, function(err, buffer, headers) {
					if (err) throw err;
					assert.deepEqual(headers, {'Content-Type': 'image/png'});
					assert.instanceOf(buffer, Buffer);
					assert(isPng(buffer), 'Invalid png');
					// var im_actual = buffer.toString('base64');
					// var im_expected = fs.readFileSync(__dirname + '/fixtures/world' + fixtureSuffix + '.png').toString('base64');
					// assert.equal(im_actual, im_expected);

					done();
				});
			});
		});
	});
});