581 lines
22 KiB
JavaScript
581 lines
22 KiB
JavaScript
var fs = require('fs');
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var crypto = require('crypto');
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var zlib = require('zlib');
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var path = require('path');
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var url = require('url');
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var qs = require('querystring');
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var Buffer = require('buffer').Buffer;
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var sm = new (require('sphericalmercator'));
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var sqlite3 = require('sqlite3');
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function noop(err) {
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if (err) throw err;
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}
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function hash(z, x, y) {
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return (1 << z) * ((1 << z) + x) + y;
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}
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// MBTiles
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// -------
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// MBTiles class for doing common operations (schema setup, tile reading,
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// insertion, etc.)
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module.exports = MBTiles;
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MBTiles.utils = require('./utils');
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// Provides access to an mbtiles database file.
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// - uri: A parsed URL hash, the only relevant part is `pathname`.
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// - callback: Will be called when the resources have been acquired
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// or acquisition failed.
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require('util').inherits(MBTiles, require('events').EventEmitter)
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function MBTiles(uri, callback) {
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if (typeof uri === 'string') uri = url.parse(uri, true);
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else if (typeof uri.query === 'string') uri.query = qs.parse(uri.query);
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if (!uri.pathname) {
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callback(new Error('Invalid URI ' + url.format(uri)));
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return;
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}
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if (uri.hostname === '.' || uri.hostname == '..') {
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uri.pathname = uri.hostname + uri.pathname;
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delete uri.hostname;
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delete uri.host;
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}
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uri.query = uri.query || {};
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if (!uri.query.batch) uri.query.batch = 100;
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var mbtiles = this;
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this.setMaxListeners(0);
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this.filename = uri.pathname;
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this._batchSize = +uri.query.batch;
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mbtiles._db = new sqlite3.Database(mbtiles.filename, function(err) {
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if (err) return callback(err);
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fs.stat(mbtiles.filename, function(err, stat) {
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if (err) return callback(err);
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mbtiles._stat = stat;
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mbtiles.open = true;
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callback(null, mbtiles);
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});
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});
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return undefined;
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};
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MBTiles.registerProtocols = function(tilelive) {
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tilelive.protocols['mbtiles:'] = MBTiles;
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};
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// Finds all mbtiles file in the filepath and returns their tilesource URI.
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MBTiles.list = function(filepath, callback) {
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filepath = path.resolve(filepath);
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fs.readdir(filepath, function(err, files) {
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if (err && err.code === 'ENOENT') return callback(null, {});
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if (err) return callback(err);
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for (var result = {}, i = 0; i < files.length; i++) {
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var name = files[i].match(/^([\w-]+)\.mbtiles$/);
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if (name) result[name[1]] = 'mbtiles://' + path.join(filepath, name[0]);
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}
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return callback(null, result);
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});
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};
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// Finds an mbtiles file with the given ID in the filepath and returns a
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// tilesource URI.
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MBTiles.findID = function(filepath, id, callback) {
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filepath = path.resolve(filepath);
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var file = path.join(filepath, id + '.mbtiles');
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fs.stat(file, function(err, stats) {
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if (err) return callback(err);
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else return callback(null, 'mbtiles://' + file);
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});
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};
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// Retrieve the schema of the current mbtiles database and inform the caller of
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// whether the specified table exists.
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MBTiles.prototype._exists = function(table, callback) {
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if (typeof callback !== 'function') callback = noop;
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if (this._schema) return callback(null, this._schema.indexOf(table) !== -1);
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var sql = 'SELECT name FROM sqlite_master WHERE type IN ("table", "view")';
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var mbtiles = this;
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this._db.all(sql, function(err, rows) {
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if (err) return callback(err);
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mbtiles._schema = rows.map(function(r) { return r.name });
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mbtiles._exists(table, callback);
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});
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};
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// DB integrity check.
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// - @param {Function(err)} callback
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MBTiles.prototype._integrity = function(callback) {
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if (typeof callback !== 'function') callback = noop;
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this._db.get('PRAGMA quick_check(1)', function(err, row) {
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if (!(row && row.integrity_check && row.integrity_check === 'ok')) {
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return callback(new Error('Corrupted database.'));
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} else {
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return callback(null);
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}
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});
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};
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// Setup schema, indices, views for a new mbtiles database.
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// - @param {Function(err)} callback
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MBTiles.prototype._setup = function(callback) {
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var mbtiles = this;
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mbtiles._exists('tiles', function(err, exists) {
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if (exists) return callback(null);
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fs.readFile(__dirname + '/schema.sql', 'utf8', function(err, sql) {
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if (err) return callback(err);
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mbtiles._db.exec(sql, callback);
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});
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});
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};
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// Select a tile from an mbtiles database. Scheme is XYZ.
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//
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// - @param {Number} z tile z coordinate.
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// - @param {Number} x tile x coordinate.
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// - @param {Number} y tile y coordinate.
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// - @param {Function(err, grid, headers)} callback
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MBTiles.prototype.getTile = function(z, x, y, callback) {
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if (typeof callback !== 'function') throw new Error('Callback needed');
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if (!this.open) return callback(new Error('MBTiles not yet loaded'));
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// Flip Y coordinate because MBTiles files are TMS.
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y = (1 << z) - 1 - y;
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var sql = 'SELECT tile_data FROM tiles WHERE zoom_level = ? AND tile_column = ? AND tile_row = ?';
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var mbtiles = this;
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this._db.get(sql, z, x, y, function(err, row) {
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if ((!err && !row) || (err && err.errno == 1)) {
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return callback(new Error('Tile does not exist'));
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} else if (err) {
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return callback(err);
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} else {
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var options = {
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'Content-Type': MBTiles.utils.getMimeType(row.tile_data),
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'Last-Modified': new Date(mbtiles._stat.mtime).toUTCString(),
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'ETag': mbtiles._stat.size + '-' + Number(mbtiles._stat.mtime)
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};
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return callback(null, row.tile_data, options);
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}
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});
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};
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// Select a grid and its data from an mbtiles database. Scheme is XYZ.
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//
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// - @param {Number} z tile z coordinate
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// - @param {Number} x tile x coordinate
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// - @param {Number} y tile y coordinate
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// - @param {Function(err, grid)} callback
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MBTiles.prototype.getGrid = function(z, x, y, callback) {
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if (typeof callback !== 'function') throw new Error('Callback needed');
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if (!this.open) return callback(new Error('MBTiles not yet loaded'));
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// Flip Y coordinate because MBTiles files are TMS.
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y = (1 << z) - 1 - y;
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var sqlgrid = 'SELECT grid FROM grids WHERE zoom_level = ? AND tile_column = ? AND tile_row = ?';
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var sqljson = 'SELECT key_name, key_json FROM grid_data WHERE zoom_level = ? AND tile_column = ? AND tile_row = ?';
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var mbtiles = this;
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mbtiles._db.get(sqlgrid, z, x, y, function(err, row) {
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if (err && err.errno !== 1) return callback(err);
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if (!row || !row.grid || err) return callback(new Error('Grid does not exist'));
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zlib.inflate(!Buffer.isBuffer(row.grid) ? new Buffer(row.grid, 'binary') : row.grid, function(err, buffer) {
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if (err) return callback(new Error('Grid is invalid:' + err.message));
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try { var grid = JSON.parse(buffer); }
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catch(err) { return callback(new Error('Grid is invalid:' + err.message)) };
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mbtiles._db.all(sqljson, z, x, y, function(err, rows) {
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if (err) return callback(err);
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grid.data = grid.data || {};
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for (var i = 0; i < rows.length; i++) {
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try { grid.data[rows[i].key_name] = JSON.parse(rows[i].key_json); }
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catch(err) { return callback(new Error('Grid is invalid:' + err.message)) };
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}
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callback(null, grid, {
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'Content-Type': 'text/javascript',
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'Last-Modified': new Date(mbtiles._stat.mtime).toUTCString(),
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'ETag': mbtiles._stat.size + '-' + Number(mbtiles._stat.mtime)
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});
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});
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});
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});
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};
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MBTiles.prototype.close = function(callback) {
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this._db.close(callback);
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};
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// Obtain metadata from the database. Performing fallback queries if certain
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// keys(like `bounds`, `minzoom`, `maxzoom`) have not been provided.
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//
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// - @param {Function(err, data)} callback
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MBTiles.prototype.getInfo = function(callback) {
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if (typeof callback !== 'function') throw new Error('Callback needed');
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if (!this.open) return callback(new Error('MBTiles not yet loaded'));
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if (this._info) return callback(null, this._info);
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var mbtiles = this;
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var info = {};
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info.scheme = 'tms';
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info.basename = path.basename(mbtiles.filename);
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info.id = path.basename(mbtiles.filename, path.extname(mbtiles.filename));
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info.filesize = mbtiles._stat.size;
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mbtiles._db.all('SELECT name, value FROM metadata', function(err, rows) {
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if (err && err.errno !== 1) return callback(err);
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if (rows) rows.forEach(function(row) {
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switch (row.name) {
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// The special "json" key/value pair allows JSON to be serialized
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// and merged into the metadata of an MBTiles based source. This
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// enables nested properties and non-string datatypes to be
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// captured by the MBTiles metadata table.
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case 'json':
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try { var jsondata = JSON.parse(row.value); }
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catch (err) { return callback(err); }
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Object.keys(jsondata).reduce(function(memo, key) {
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memo[key] = memo[key] || jsondata[key];
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return memo;
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}, info);
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break;
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case 'minzoom':
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case 'maxzoom':
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info[row.name] = parseInt(row.value, 10);
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break;
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case 'center':
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case 'bounds':
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info[row.name] = row.value.split(',').map(parseFloat);
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break;
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default:
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info[row.name] = row.value;
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break;
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}
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});
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ensureZooms(info, function(err, info) {
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if (err) return callback(err);
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ensureBounds(info, function(err, info) {
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if (err) return callback(err);
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ensureCenter(info, function(err, info) {
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if (err) return callback(err);
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mbtiles._info = info;
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return callback(null, info);
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});
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});
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});
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});
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function ensureZooms(info, callback) {
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if ('minzoom' in info && 'maxzoom' in info) return callback(null, info);
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var remaining = 30;
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var zooms = [];
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var query = mbtiles._db.prepare('SELECT zoom_level FROM tiles WHERE zoom_level = ? LIMIT 1', function(err) {
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if (err) return callback(err.errno === 1 ? null : err, info);
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for (var i = 0; i < remaining; i++) query.get(i, function(err, row) {
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if (err) return (remaining = 0) && callback(err);
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if (row) zooms.push(row.zoom_level);
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if (--remaining === 0) {
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if (!zooms.length) return callback(null, info);
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zooms.sort(function(a,b) { return a < b ? -1 : 1 });
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info.minzoom = zooms[0];
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info.maxzoom = zooms.pop();
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return callback(null, info);
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}
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});
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query.finalize();
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});
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};
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function ensureBounds(info, callback) {
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if ('bounds' in info) return callback(null, info);
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if (!('minzoom' in info)) return callback(null, info);
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mbtiles._db.get(
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'SELECT MAX(tile_column) AS maxx, ' +
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'MIN(tile_column) AS minx, MAX(tile_row) AS maxy, ' +
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'MIN(tile_row) AS miny FROM tiles ' +
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'WHERE zoom_level = ?',
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info.minzoom,
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function(err, row) {
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if (err) return callback(err);
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if (!row) return callback(null, info);
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// @TODO this breaks a little at zoom level zero
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var urTile = sm.bbox(row.maxx, row.maxy, info.minzoom, true);
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var llTile = sm.bbox(row.minx, row.miny, info.minzoom, true);
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// @TODO bounds are limited to "sensible" values here
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// as sometimes tilesets are rendered with "negative"
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// and/or other extremity tiles. Revisit this if there
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// are actual use cases for out-of-bounds bounds.
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info.bounds = [
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llTile[0] > -180 ? llTile[0] : -180,
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llTile[1] > -90 ? llTile[1] : -90,
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urTile[2] < 180 ? urTile[2] : 180,
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urTile[3] < 90 ? urTile[3] : 90
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];
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return callback(null, info);
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});
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};
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function ensureCenter(info, callback) {
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if ('center' in info) return callback(null, info);
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if (!('bounds' in info) || !('minzoom' in info) || !('maxzoom' in info)) return callback(null, info);
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info.center = [
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(info.bounds[2] - info.bounds[0]) / 2 + info.bounds[0],
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(info.bounds[3] - info.bounds[1]) / 2 + info.bounds[1],
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Math.floor((info.maxzoom-info.minzoom)*0.5) + info.minzoom
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];
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return callback(null, info);
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};
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};
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// Puts the MBTiles tilestore into write mode.
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//
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// - @param {Function(err)} callback
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MBTiles.prototype.startWriting = function(callback) {
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if (typeof callback !== 'function') throw new Error('Callback needed');
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if (!this.open) return callback(new Error('MBTiles not yet loaded'));
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var mbtiles = this;
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mbtiles._clearCaches();
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mbtiles._setup(function(err) {
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if (err) return callback(err);
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if (mbtiles._isWritable) return callback();
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// Sets the synchronous flag to OFF for (much) faster inserts.
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// See http://www.sqlite3.org/pragma.html#pragma_synchronous
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mbtiles._isWritable = 1;
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mbtiles._db.run('PRAGMA synchronous=OFF', callback);
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});
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};
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MBTiles.prototype._clearCaches = function() {
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this._pending = 0;
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this._tileCache = {};
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this._gridCache = {};
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this._keyCache = {};
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this._dataCache = {};
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this._mapCache = {};
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};
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// (private) Commits the cached changes to the database.
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//
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// - @param {Function(err)} callback
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MBTiles.prototype._commit = function(callback) {
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var mbtiles = this;
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mbtiles._db.serialize(function() {
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mbtiles._db.run('BEGIN');
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if (Object.keys(mbtiles._tileCache)) {
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// Insert images table.
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var images = mbtiles._db.prepare('REPLACE INTO images (tile_id, tile_data) VALUES (?, ?)');
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for (var id in mbtiles._tileCache) {
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images.run(id, mbtiles._tileCache[id]);
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}
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images.finalize();
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}
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if (Object.keys(mbtiles._gridCache)) {
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// Insert grid_utfgrid table.
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var grids = mbtiles._db.prepare('REPLACE INTO grid_utfgrid (grid_id, grid_utfgrid) VALUES (?, ?)');
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for (var id in mbtiles._gridCache) {
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grids.run(id, mbtiles._gridCache[id]);
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}
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grids.finalize();
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}
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if (Object.keys(mbtiles._keyCache)) {
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// Insert grid_key.
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var keys = mbtiles._db.prepare('INSERT OR IGNORE INTO grid_key (grid_id, key_name) VALUES (?, ?)');
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for (var id in mbtiles._keyCache) {
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mbtiles._keyCache[id].forEach(function(key) {
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keys.run(id, key);
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});
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}
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keys.finalize();
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}
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if (Object.keys(mbtiles._dataCache)) {
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// Insert keymap table.
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var keymap = mbtiles._db.prepare('REPLACE INTO keymap (key_name, key_json) VALUES (?, ?)');
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for (var key in mbtiles._dataCache) {
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keymap.run(key, JSON.stringify(mbtiles._dataCache[key]));
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}
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keymap.finalize();
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}
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// Insert map table. This has to be so complicate due to a design flaw
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// in the tables.
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// TODO: This should be remedied when we upgrade the MBTiles schema.
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var mapBoth = mbtiles._db.prepare('REPLACE INTO map (zoom_level, ' +
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'tile_column, tile_row, tile_id, grid_id) VALUES (?, ?, ?, ?, ?)');
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var mapTile = mbtiles._db.prepare('REPLACE INTO map (zoom_level, ' +
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'tile_column, tile_row, tile_id, grid_id) VALUES (?, ?, ?, ?, ' +
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'(SELECT grid_id FROM map WHERE zoom_level = ? ' +
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'AND tile_column = ? AND tile_row = ?))');
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var mapGrid = mbtiles._db.prepare('REPLACE INTO map (zoom_level, ' +
|
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'tile_column, tile_row, tile_id, grid_id) VALUES (?, ?, ?, ' +
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'(SELECT tile_id FROM map WHERE zoom_level = ? ' +
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'AND tile_column = ? AND tile_row = ?), ?)');
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for (var coords in mbtiles._mapCache) {
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var map = mbtiles._mapCache[coords];
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if (typeof map.grid_id === 'undefined') {
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// Only the tile_id is defined.
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mapTile.run(map.z, map.x, map.y, map.tile_id, map.z, map.x, map.y);
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} else if (typeof map.tile_id === 'undefined') {
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// Only the grid_id is defined.
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mapGrid.run(map.z, map.x, map.y, map.z, map.x, map.y, map.grid_id);
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} else {
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// Both tile_id and grid_id are defined.
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mapBoth.run(map.z, map.x, map.y, map.tile_id, map.grid_id);
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}
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}
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mapBoth.finalize();
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mapTile.finalize();
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mapGrid.finalize();
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mbtiles._db.run('COMMIT', callback);
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mbtiles._clearCaches();
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});
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};
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// Leaves write mode.
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//
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// - @param {Function(err)} callback
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MBTiles.prototype.stopWriting = function(callback) {
|
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if (typeof callback !== 'function') throw new Error('Callback needed');
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if (!this.open) return callback(new Error('MBTiles not yet loaded'));
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var mbtiles = this;
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mbtiles._commit(function(err) {
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if (err) return callback(err);
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mbtiles._db.run('PRAGMA synchronous=NORMAL', function(err) {
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if (err) return callback(err);
|
|
mbtiles._isWritable = false;
|
|
return callback();
|
|
});
|
|
});
|
|
};
|
|
|
|
// Inserts a tile into the MBTiles store. Scheme is XYZ.
|
|
//
|
|
// - @param {Number} z tile z coordinate
|
|
// - @param {Number} x tile x coordinate
|
|
// - @param {Number} y tile y coordinate
|
|
// - @param {Buffer} buffer tile image data
|
|
// - @param {Function(err)} callback
|
|
MBTiles.prototype.putTile = function(z, x, y, data, callback) {
|
|
if (typeof callback !== 'function') throw new Error('Callback needed');
|
|
if (!this.open) return callback(new Error('MBTiles not yet loaded'));
|
|
if (!this._isWritable) return callback(new Error('MBTiles not in write mode'));
|
|
if (!Buffer.isBuffer(data)) return callback(new Error('Image needs to be a Buffer'));
|
|
|
|
// Flip Y coordinate because MBTiles files are TMS.
|
|
y = (1 << z) - 1 - y;
|
|
|
|
// Tilelive may pass us a data.key. If not, generate an md5
|
|
// from the image buffer data.
|
|
var id = data.key
|
|
? String(data.key)
|
|
: crypto.createHash('md5').update(data).digest('hex');
|
|
|
|
// This corresponds to the images table.
|
|
if (!this._tileCache[id]) this._tileCache[id] = data;
|
|
|
|
// This corresponds to the map table.
|
|
var coords = hash(z, x, y);
|
|
if (!this._mapCache[coords]) this._mapCache[coords] = { z: z, x: x, y: y };
|
|
this._mapCache[coords].tile_id = id;
|
|
|
|
// Only commit when we can insert at least batchSize rows.
|
|
if (++this._pending >= this._batchSize) return this._commit(callback);
|
|
else return callback(null);
|
|
};
|
|
|
|
// Inserts a grid into the MBTiles store. Scheme is XYZ.
|
|
//
|
|
// - @param {Number} z grid z coordinate
|
|
// - @param {Number} x grid x coordinate
|
|
// - @param {Number} y grid y coordinate
|
|
// - @param {Object} data grid object
|
|
// - @param {Function(err)} callback
|
|
MBTiles.prototype.putGrid = function(z, x, y, data, callback) {
|
|
if (typeof callback !== 'function') throw new Error('Callback needed');
|
|
if (!this.open) return callback(new Error('MBTiles not yet loaded'));
|
|
if (!this._isWritable) return callback(new Error('MBTiles not in write mode'));
|
|
|
|
// Flip Y coordinate because MBTiles files are TMS.
|
|
y = (1 << z) - 1 - y;
|
|
|
|
// Preprocess grid data.
|
|
var json = JSON.stringify({ grid: data.grid, keys: data.keys });
|
|
|
|
// Tilelive may pass us a data.key. If not, generate an md5
|
|
// from the grid data.
|
|
var id = data.key
|
|
? String(data.key)
|
|
: crypto.createHash('md5').update(json).digest('hex');
|
|
|
|
// This corresponds to the map table.
|
|
var coords = hash(z, x, y);
|
|
if (!this._mapCache[coords]) this._mapCache[coords] = { z: z, x: x, y: y };
|
|
this._mapCache[coords].grid_id = id;
|
|
|
|
var mbtiles = this;
|
|
|
|
if (mbtiles._gridCache[id]) return callback(null);
|
|
|
|
zlib.deflate(new Buffer(json, 'utf8'), function(err, buffer) {
|
|
if (err) return callback(err);
|
|
// grid_utfgrid table.
|
|
mbtiles._gridCache[id] = buffer;
|
|
// grid_key table.
|
|
mbtiles._keyCache[id] = Object.keys(data.data || {});
|
|
// keymap table.
|
|
if (data.data) Object.keys(data.data).reduce(function(memo, key) {
|
|
memo[key] = data.data[key];
|
|
return memo;
|
|
}, mbtiles._dataCache);
|
|
// Only commit when we can insert at least batchSize rows.
|
|
if (++mbtiles._pending >= mbtiles._batchSize) {
|
|
mbtiles._commit(callback);
|
|
} else {
|
|
callback(null);
|
|
}
|
|
});
|
|
};
|
|
|
|
MBTiles.prototype.putInfo = function(data, callback) {
|
|
if (typeof callback !== 'function') throw new Error('Callback needed');
|
|
if (!this.open) return callback(new Error('MBTiles not yet loaded'));
|
|
if (!this._isWritable) return callback(new Error('MBTiles not in write mode'));
|
|
|
|
var jsondata;
|
|
var stmt = this._db.prepare('REPLACE INTO metadata (name, value) VALUES (?, ?)');
|
|
stmt.on('error', callback);
|
|
for (var key in data) {
|
|
// If a data property is a javascript hash/object, slip it into
|
|
// the 'json' field which contains stringified JSON to be merged
|
|
// in at read time. Allows nested/deep metadata to be recorded.
|
|
var nested = typeof data[key] === 'object' &&
|
|
key !== 'bounds' &&
|
|
key !== 'center';
|
|
if (nested) {
|
|
jsondata = jsondata || {};
|
|
jsondata[key] = data[key];
|
|
} else {
|
|
stmt.run(key, String(data[key]));
|
|
}
|
|
}
|
|
if (jsondata) stmt.run('json', JSON.stringify(jsondata));
|
|
|
|
var mbtiles = this;
|
|
stmt.finalize(function(err) {
|
|
if (err) return callback(err);
|
|
delete mbtiles._info;
|
|
mbtiles.getInfo(function(err, info) {
|
|
return callback(err, null);
|
|
});
|
|
});
|
|
};
|
|
|