95 lines
3.3 KiB
JavaScript
95 lines
3.3 KiB
JavaScript
var sqlApi = require('../sql/sql_api');
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function QueryTablesApi() {
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}
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var affectedTableRegexCache = {
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bbox: /!bbox!/g,
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pixel_width: /!pixel_width!/g,
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pixel_height: /!pixel_height!/g
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};
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module.exports = QueryTablesApi;
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QueryTablesApi.prototype.getLastUpdatedTime = function (username, api_key, tableNames, callback) {
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var sql = 'SELECT EXTRACT(EPOCH FROM max(updated_at)) as max FROM CDB_TableMetadata m WHERE m.tabname = any (ARRAY['+
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tableNames.map(function(t) { return "'" + t + "'::regclass"; }).join(',') +
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'])';
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// call sql api
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sqlApi.query(username, api_key, sql, function(err, rows){
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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 find last updated timestamp: ' + msg));
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return;
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}
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// when the table has not updated_at means it hasn't been changed so a default last_updated is set
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var last_updated = 0;
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if(rows.length !== 0) {
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last_updated = rows[0].max || 0;
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}
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callback(null, last_updated*1000);
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});
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};
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QueryTablesApi.prototype.getAffectedTablesInQuery = function (username, api_key, sql, callback) {
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// Replace mapnik tokens
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sql = sql
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.replace(affectedTableRegexCache.bbox, 'ST_MakeEnvelope(0,0,0,0)')
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.replace(affectedTableRegexCache.pixel_width, '1')
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.replace(affectedTableRegexCache.pixel_height, '1')
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;
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// Pass to CDB_QueryTables
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sql = 'SELECT CDB_QueryTables($windshaft$' + sql + '$windshaft$)';
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// call sql api
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sqlApi.query(username, api_key, sql, function(err, rows){
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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 fetch source tables: ' + msg));
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return;
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}
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var qtables = rows[0].cdb_querytables;
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var tableNames = qtables.split(/^\{(.*)\}$/)[1];
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tableNames = tableNames ? tableNames.split(',') : [];
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callback(null, tableNames);
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});
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};
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QueryTablesApi.prototype.getAffectedTablesAndLastUpdatedTime = function (username, api_key, sql, callback) {
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sql = sql
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.replace(affectedTableRegexCache.bbox, 'ST_MakeEnvelope(0,0,0,0)')
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.replace(affectedTableRegexCache.pixel_width, '1')
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.replace(affectedTableRegexCache.pixel_height, '1')
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;
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var query = [
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'WITH querytables AS (SELECT * FROM CDB_QueryTables($windshaft$' + sql + '$windshaft$) as tablenames)',
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'SELECT (SELECT tablenames FROM querytables), EXTRACT(EPOCH FROM max(updated_at)) as max',
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'FROM CDB_TableMetadata m',
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'WHERE m.tabname = any ((SELECT tablenames from querytables)::regclass[])'
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].join(' ');
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sqlApi.query(username, api_key, query, function(err, rows){
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if (err || rows.length === 0) {
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var msg = err.message ? err.message : err;
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callback(new Error('could not fetch affected tables and last updated time: ' + msg));
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return;
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}
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var result = rows[0];
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var tableNames = result.tablenames.split(/^\{(.*)\}$/)[1];
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tableNames = tableNames ? tableNames.split(',') : [];
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var lastUpdatedTime = result.max || 0;
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callback(null, {
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affectedTables: tableNames,
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lastUpdatedTime: lastUpdatedTime * 1000
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});
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});
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};
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