66 lines
2.1 KiB
JavaScript
66 lines
2.1 KiB
JavaScript
var queue = require('queue-async');
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var QueryTablesApi = require('./query_tables_api');
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function OverviewsApi(pgQueryRunner) {
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if (pgQueryRunner.pgQueryRunner != null) {
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this.queryTablesApi = pgQueryRunner;
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this.pgQueryRunner = this.queryTablesApi.pgQueryRunner;
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} else {
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this.pgQueryRunner = pgQueryRunner;
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this.queryTablesApi = new QueryTablesApi(pgQueryRunner);
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}
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}
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module.exports = OverviewsApi;
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OverviewsApi.prototype.getOverviewsMetadata = function (username, sql, callback) {
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this.queryTablesApi.getAffectedTablesInQuery(username, sql, function(err, tableNames){
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if (err) {
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callback(err);
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} else {
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metadata = {};
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var parallelism = 2;
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var q = queue(parallelism);
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for ( var i=0; i < tableNames.length; ++i ) {
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(function(tableName) {
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q.defer(function(done){
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var sql = "SELECT * FROM CDB_Overviews('" + tableName + "');";
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this.pgQueryRunner.run(username, query, handleOverviewsRows, function(err, table_metadata){
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if (err) {
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done(err);
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} else {
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metadata[tableName] = table_metadata;
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done(null);
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}
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});
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});
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}(tableNames[i]));
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}
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q.awaitAll(function(err, results){
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if (err) {
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return callback(err);
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} else {
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return callback(null, metadata);
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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 handleOverviewsRows(err, rows, callback) {
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if (err){
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var msg = err.message ? err.message : err;
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callback(new Error('could not get overviews metadata: ' + msg));
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return;
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}
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var metadata = {};
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for ( var i=0; i<rows.length; ++i ) {
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var row = rows[i];
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metadata[row.z] = { table: row.overview_table };
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};
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callback(null, metadata);
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}
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