352 lines
10 KiB
JavaScript
352 lines
10 KiB
JavaScript
'use strict';
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var crypto = require('crypto');
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var step = require('step');
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var fs = require('fs');
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var _ = require('underscore');
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var PSQL = require('cartodb-psql');
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var spawn = require('child_process').spawn;
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// Keeps track of what's waiting baking for export
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var bakingExports = {};
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function OgrFormat (id) {
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this.id = id;
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}
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OgrFormat.prototype = {
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id: 'ogr',
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is_file: true,
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getQuery: function (/* sql, options */) {
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return null; // dont execute the query
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},
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transform: function (/* result, options, callback */) {
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throw new Error('should not be called for file formats');
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},
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getContentType: function () { return this._contentType; },
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getFileExtension: function () { return this._fileExtension; },
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getKey: function (options) {
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return [this.id,
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options.dbopts.dbname,
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options.dbopts.user,
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options.gn,
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this.generateMD5(options.filename),
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this.generateMD5(options.sql)].concat(options.skipfields).join(':');
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},
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generateMD5: function (data) {
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var hash = crypto.createHash('md5');
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hash.update(data);
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return hash.digest('hex');
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}
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};
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// Internal function usable by all OGR-driven outputs
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OgrFormat.prototype.toOGR = function (options, outFormat, outFilename, callback) {
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// var gcol = options.gn;
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var sql = options.sql;
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var skipfields = options.skipfields;
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var outLayername = options.filename;
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var dbopts = options.dbopts;
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var ogr2ogr = global.settings.ogr2ogrCommand || 'ogr2ogr';
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var dbhost = dbopts.host;
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var dbport = dbopts.port;
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var dbuser = dbopts.user;
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var dbpass = dbopts.pass;
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var dbname = dbopts.dbname;
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var timeout = options.timeout;
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var that = this;
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var columns = [];
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var geocol;
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var pg;
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// Drop ending semicolon (ogr doens't like it)
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sql = sql.replace(/;\s*$/, '');
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const theGeomFirst = (fieldA, fieldB) => {
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if (fieldA.name === 'the_geom') {
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return -1;
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}
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if (fieldB.name === 'the_geom') {
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return 1;
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}
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return 0;
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};
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step(
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function fetchColumns () {
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var colsql = 'SELECT * FROM (' + sql + ') as _cartodbsqlapi LIMIT 0';
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pg = new PSQL(dbopts);
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pg.query(colsql, this);
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},
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function findSRS (err, result) {
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if (err) {
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throw err;
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}
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var needSRS = that._needSRS;
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columns = result.fields
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// skip columns
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.filter(field => skipfields.indexOf(field.name) === -1)
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// put "the_geom" first (if exists)
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.sort(theGeomFirst)
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// get first geometry to calculate SRID ("the_geom" if exists)
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.map(field => {
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if (needSRS && !geocol && pg.typeName(field.dataTypeID) === 'geometry') {
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geocol = field.name;
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}
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return field;
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})
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// apply quotes to columns
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.map(field => outFormat === 'CSV' ? pg.quoteIdentifier(field.name) + '::text' : pg.quoteIdentifier(field.name));
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if (!needSRS || !geocol) {
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return null;
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}
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var next = this;
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var qgeocol = pg.quoteIdentifier(geocol);
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var sridsql = 'SELECT ST_Srid(' + qgeocol + ') as srid, GeometryType(' +
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qgeocol + ') as type FROM (' + sql + ') as _cartodbsqlapi WHERE ' +
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qgeocol + ' is not null limit 1';
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pg.query(sridsql, function (err, result) {
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if (err) { next(err); return; }
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if (result.rows.length) {
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var srid = result.rows[0].srid;
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var type = result.rows[0].type;
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next(null, srid, type);
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} else {
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// continue as srid and geom type are not critical when there are no results
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next(null);
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}
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});
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},
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function spawnDumper (err, srid, type) {
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if (err) {
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throw err;
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}
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var next = this;
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var ogrsql = 'SELECT ' + columns.join(',') + ' FROM (' + sql + ') as _cartodbsqlapi';
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var ogrargs = [
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'-f', outFormat,
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'-lco', 'RESIZE=YES',
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'-lco', 'ENCODING=UTF-8',
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'-lco', 'LINEFORMAT=CRLF',
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outFilename,
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'PG:host=' + dbhost + ' port=' + dbport + ' user=' + dbuser + ' dbname=' + dbname + ' password=' + dbpass,
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'-sql', ogrsql
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];
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if (srid) {
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ogrargs.push('-a_srs', 'EPSG:' + srid);
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}
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if (type) {
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ogrargs.push('-nlt', type);
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}
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if (options.cmd_params) {
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ogrargs = ogrargs.concat(options.cmd_params);
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}
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ogrargs.push('-nln', outLayername);
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// TODO: research if `exec` could fit better than `spawn`
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var child = spawn(ogr2ogr, ogrargs);
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var timedOut = false;
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var ogrTimeout;
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if (timeout > 0) {
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ogrTimeout = setTimeout(function () {
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timedOut = true;
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child.kill();
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}, timeout);
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}
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child.on('error', function (err) {
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clearTimeout(ogrTimeout);
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next(err);
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});
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var stderrData = [];
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child.stderr.setEncoding('utf8');
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child.stderr.on('data', function (data) {
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stderrData.push(data);
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});
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child.on('exit', function (code) {
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clearTimeout(ogrTimeout);
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if (timedOut) {
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return next(new Error('statement timeout'));
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}
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if (code !== 0) {
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var errMessage = 'ogr2ogr command return code ' + code;
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if (stderrData.length > 0) {
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errMessage += ', Error: ' + stderrData.join('\n');
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}
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return next(new Error(errMessage));
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}
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return next();
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});
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},
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function finish (err) {
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callback(err, outFilename);
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}
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);
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};
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OgrFormat.prototype.toOGR_SingleFile = function (options, fmt, callback) {
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var dbname = options.dbopts.dbname;
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var userId = options.dbopts.user;
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var gcol = options.gcol;
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var sql = options.sql;
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var skipfields = options.skipfields;
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var ext = this._fileExtension;
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var layername = options.filename;
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var tmpdir = global.settings.tmpDir || '/tmp';
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var reqKey = [
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fmt,
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dbname,
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userId,
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gcol,
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this.generateMD5(layername),
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this.generateMD5(sql)
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].concat(skipfields).join(':');
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var outdirpath = tmpdir + '/sqlapi-' + process.pid + '-' + reqKey;
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var dumpfile = outdirpath + ':cartodb-query.' + ext;
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// TODO: following tests:
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// - fetch query with no "the_geom" column
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this.toOGR(options, fmt, dumpfile, callback);
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};
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OgrFormat.prototype.sendResponse = function (opts, callback) {
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// var next = callback;
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var reqKey = this.getKey(opts);
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var qElem = new ExportRequest(opts.sink, callback, opts.beforeSink);
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var baking = bakingExports[reqKey];
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if (baking) {
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baking.req.push(qElem);
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} else {
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baking = bakingExports[reqKey] = { req: [qElem] };
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this.generate(opts, function (err, dumpfile) {
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if (opts.profiler) {
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opts.profiler.done('generate');
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}
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step(
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function sendResults () {
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var nextPipe = function (finish) {
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var r = baking.req.shift();
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if (!r) { finish(null); return; }
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r.sendFile(err, dumpfile, function () {
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nextPipe(finish);
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});
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};
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if (!err) {
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nextPipe(this);
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} else {
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_.each(baking.req, function (r) {
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r.cb(err);
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});
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return true;
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}
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},
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function cleanup (/* err */) {
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delete bakingExports[reqKey];
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// unlink dump file (sync to avoid race condition)
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console.log('removing', dumpfile);
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try { fs.unlinkSync(dumpfile); } catch (e) {
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if (e.code !== 'ENOENT') {
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console.log('Could not unlink dumpfile ' + dumpfile + ': ' + e);
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}
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}
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}
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);
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});
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}
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};
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function ExportRequest (ostream, callback, beforeSink) {
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this.cb = callback;
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this.beforeSink = beforeSink;
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this.ostream = ostream;
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this.istream = null;
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this.canceled = false;
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var that = this;
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this.ostream.on('close', function () {
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that.canceled = true;
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if (that.istream) {
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that.istream.destroy();
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}
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});
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}
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ExportRequest.prototype.sendFile = function (err, filename, callback) {
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if (err) {
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return callback(err);
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}
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var that = this;
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if (!this.canceled) {
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this.istream = fs.createReadStream(filename)
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.on('open', function (/* fd */) {
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if (that.beforeSink) {
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that.beforeSink();
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}
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that.istream
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.pipe(that.ostream)
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.on('end', () => {
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callback();
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that.cb();
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})
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.on('error', (err) => {
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callback();
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that.cb(err);
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});
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})
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.on('error', function (e) {
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console.log("Can't send response: " + e);
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that.ostream.end();
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that.cb(e);
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callback();
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})
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.on('end', () => {
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that.cb();
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callback();
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});
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} else {
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callback();
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}
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};
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module.exports = OgrFormat;
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