76 lines
2.4 KiB
JavaScript
76 lines
2.4 KiB
JavaScript
function QueryTablesApi(pgQueryRunner) {
|
|
this.pgQueryRunner = pgQueryRunner;
|
|
}
|
|
|
|
var affectedTableRegexCache = {
|
|
bbox: /!bbox!/g,
|
|
scale_denominator: /!scale_denominator!/g,
|
|
pixel_width: /!pixel_width!/g,
|
|
pixel_height: /!pixel_height!/g
|
|
};
|
|
|
|
module.exports = QueryTablesApi;
|
|
|
|
|
|
QueryTablesApi.prototype.getAffectedTablesInQuery = function (username, sql, callback) {
|
|
|
|
var query = 'SELECT CDB_QueryTables($windshaft$' + prepareSql(sql) + '$windshaft$)';
|
|
|
|
this.pgQueryRunner.run(username, query, handleAffectedTablesInQueryRows, callback);
|
|
};
|
|
|
|
function handleAffectedTablesInQueryRows(err, rows, callback) {
|
|
if (err){
|
|
var msg = err.message ? err.message : err;
|
|
callback(new Error('could not fetch source tables: ' + msg));
|
|
return;
|
|
}
|
|
var qtables = rows[0].cdb_querytables;
|
|
var tableNames = qtables.split(/^\{(.*)\}$/)[1];
|
|
tableNames = tableNames ? tableNames.split(',') : [];
|
|
callback(null, tableNames);
|
|
}
|
|
|
|
QueryTablesApi.prototype.getAffectedTablesAndLastUpdatedTime = function (username, sql, callback) {
|
|
|
|
var query = [
|
|
'WITH querytables AS (',
|
|
'SELECT * FROM CDB_QueryTables($windshaft$' + prepareSql(sql) + '$windshaft$) as tablenames',
|
|
')',
|
|
'SELECT (SELECT tablenames FROM querytables), EXTRACT(EPOCH FROM max(updated_at)) as max',
|
|
'FROM CDB_TableMetadata m',
|
|
'WHERE m.tabname = any ((SELECT tablenames from querytables)::regclass[])'
|
|
].join(' ');
|
|
|
|
this.pgQueryRunner.run(username, query, handleAffectedTablesAndLastUpdatedTimeRows, callback);
|
|
};
|
|
|
|
function handleAffectedTablesAndLastUpdatedTimeRows(err, rows, callback) {
|
|
if (err || rows.length === 0) {
|
|
var msg = err.message ? err.message : err;
|
|
callback(new Error('could not fetch affected tables and last updated time: ' + msg));
|
|
return;
|
|
}
|
|
|
|
var result = rows[0];
|
|
|
|
var tableNames = result.tablenames.split(/^\{(.*)\}$/)[1];
|
|
tableNames = tableNames ? tableNames.split(',') : [];
|
|
|
|
var lastUpdatedTime = result.max || 0;
|
|
|
|
callback(null, {
|
|
affectedTables: tableNames,
|
|
lastUpdatedTime: lastUpdatedTime * 1000
|
|
});
|
|
}
|
|
|
|
function prepareSql(sql) {
|
|
return sql
|
|
.replace(affectedTableRegexCache.bbox, 'ST_MakeEnvelope(0,0,0,0)')
|
|
.replace(affectedTableRegexCache.scale_denominator, '0')
|
|
.replace(affectedTableRegexCache.pixel_width, '1')
|
|
.replace(affectedTableRegexCache.pixel_height, '1')
|
|
;
|
|
}
|