7f7ef682ac
Closes #112. Only looks up "geometry" and "raster" types for now, can be improved over time.
111 lines
2.4 KiB
JavaScript
111 lines
2.4 KiB
JavaScript
var Step = require('step')
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var PSQL = require(global.settings.app_root + '/app/models/psql')
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function pg(id) { this.id = id; }
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pg.prototype = {
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getQuery: function(sql, options) {
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return sql;
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},
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getContentType: function(){
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return this._contentType;
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},
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getFileExtension: function() {
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return this.id;
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},
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};
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pg.prototype.handleQueryRow = function(row, result) {
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//console.log("Got query row, row is "); console.dir(row);
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//console.log("opts are: "); console.dir(this.opts);
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var sf = this.opts.skipfields;
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if ( sf.length ){
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for ( var j=0; j<sf.length; ++j ) {
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delete row[sf[j]];
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}
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}
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result.addRow(row);
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};
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pg.prototype.handleQueryEnd = function(result) {
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if ( this.error ) {
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this.callback(this.error);
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return;
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}
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//console.log("Got query end, result is "); console.dir(result);
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var end = Date.now();
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this.opts.total_time = (end - this.start_time)/1000;
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// Drop field description for skipped fields
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var sf = this.opts.skipfields;
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if ( sf.length ){
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var newfields = [];
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for ( var j=0; j<result.fields.length; ++j ) {
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var f = result.fields[j];
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if ( sf.indexOf(f.name) == -1 ) newfields.push(f);
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}
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result.fields = newfields;
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}
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var that = this;
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Step (
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function packageResult() {
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that.transform(result, that.opts, this);
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},
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function sendResults(err, out){
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if (err) throw err;
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// return to browser
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if ( out ) {
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that.opts.sink.send(out);
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} else {
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console.error("No output from transform, doing nothing ?!");
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}
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},
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function errorHandle(err){
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that.callback(err);
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}
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);
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};
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pg.prototype.sendResponse = function(opts, callback) {
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if ( this.callback ) {
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callback(new Error("Invalid double call to .sendResponse on a pg formatter"));
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return;
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}
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this.callback = callback;
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this.opts = opts;
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var sql = this.getQuery(opts.sql, {
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gn: opts.gn,
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dp: opts.dp,
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skipfields: opts.skipfields
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});
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var that = this;
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this.start_time = Date.now();
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this.client = new PSQL(opts.user_id, opts.database);
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this.client.eventedQuery(sql, function(err, query) {
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if (err) {
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callback(err);
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return;
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}
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query.on('row', that.handleQueryRow.bind(that));
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query.on('end', that.handleQueryEnd.bind(that));
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query.on('error', function(err) { that.error = err; });
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});
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};
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module.exports = pg;
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