63 lines
2.0 KiB
JavaScript
63 lines
2.0 KiB
JavaScript
var PSQL = require('cartodb-psql');
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var generateMD5 = require('../utils/md5');
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var queryMayWrite = require('../utils/query_may_write');
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function QueryTablesApi(tableCache) {
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this.tableCache = tableCache;
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}
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module.exports = QueryTablesApi;
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QueryTablesApi.prototype.getAffectedTablesAndLastUpdatedTime = function (connectionParams, sql, callback) {
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var self = this;
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var sqlCacheKey = generateMD5(sql);
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var queryExplainResult = this.tableCache.get(sqlCacheKey);
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if (queryExplainResult) {
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queryExplainResult.hits++;
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return callback(null, queryExplainResult);
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}
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var query = [
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'WITH querytables AS (',
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'SELECT * FROM CDB_QueryTablesText($quotesql$' + sql + '$quotesql$) as tablenames',
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')',
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'SELECT (SELECT tablenames FROM querytables), EXTRACT(EPOCH FROM max(updated_at)) as max',
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'FROM CDB_TableMetadata m',
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'WHERE m.tabname = any ((SELECT tablenames from querytables)::regclass[])'
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].join(' ');
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var pg = new PSQL(connectionParams, {}, { destroyOnError: true });
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pg.query(query, function handleAffectedTablesAndLastUpdatedTimeRows(err, resultSet) {
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resultSet = resultSet || {};
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var rows = resultSet.rows || [];
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if (err || rows.length !== 1) {
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var errorMessage = (err && err.message) || 'unknown error';
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console.error("Error on query explain '%s': %s", sql, errorMessage);
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}
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var result = rows[0] || {};
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// This is an Array, so no need to split into parts
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var tableNames = result.tablenames || [];
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var lastUpdatedTime = (Number.isFinite(result.max)) ? (result.max * 1000) : Date.now();
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var queryExplainResult = {
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affectedTables: tableNames,
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lastModified: lastUpdatedTime,
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mayWrite: queryMayWrite(sql),
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hits: 1
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};
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self.tableCache.set(sqlCacheKey, queryExplainResult);
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return callback(null, queryExplainResult);
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}, true);
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};
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