44 lines
1.4 KiB
JavaScript
44 lines
1.4 KiB
JavaScript
function OverviewsMetadataApi(pgQueryRunner) {
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this.pgQueryRunner = pgQueryRunner;
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}
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module.exports = OverviewsMetadataApi;
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// TODO: share this with QueryTablesApi? ... or maintain independence?
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var affectedTableRegexCache = {
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bbox: /!bbox!/g,
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scale_denominator: /!scale_denominator!/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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function prepareSql(sql) {
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return sql
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.replace(affectedTableRegexCache.bbox, 'ST_MakeEnvelope(0,0,0,0)')
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.replace(affectedTableRegexCache.scale_denominator, '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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}
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OverviewsMetadataApi.prototype.getOverviewsMetadata = function (username, sql, callback) {
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var query = 'SELECT * FROM CDB_Overviews(CDB_QueryTablesText($windshaft$' + prepareSql(sql) + '$windshaft$))';
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this.pgQueryRunner.run(username, query, function handleOverviewsRows(err, rows) {
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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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var metadata = {};
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rows.forEach(function(row) {
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var table = row.base_table;
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var table_metadata = metadata[table];
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if ( !table_metadata ) {
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table_metadata = metadata[table] = {};
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}
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table_metadata[row.z] = { table: row.overview_table };
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});
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return callback(null, metadata);
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});
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};
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