67 lines
1.4 KiB
JavaScript
67 lines
1.4 KiB
JavaScript
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'use strict';
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const LRU = require('lru-cache').default;
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let parserCache = new LRU({
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max: 15000,
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});
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function keyFromFields(type, fields, options, config) {
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const res = [
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type,
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typeof options.nestTables,
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options.nestTables,
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Boolean(options.rowsAsArray),
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Boolean(options.supportBigNumbers || config.supportBigNumbers),
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Boolean(options.bigNumberStrings || config.bigNumberStrings),
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typeof options.typeCast,
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options.timezone || config.timezone,
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Boolean(options.decimalNumbers),
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options.dateStrings,
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];
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for (let i = 0; i < fields.length; ++i) {
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const field = fields[i];
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res.push([
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field.name,
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field.columnType,
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field.length,
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field.schema,
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field.table,
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field.flags,
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field.characterSet,
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]);
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}
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return JSON.stringify(res, null, 0);
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}
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function getParser(type, fields, options, config, compiler) {
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const key = keyFromFields(type, fields, options, config);
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let parser = parserCache.get(key);
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if (parser) {
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return parser;
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}
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parser = compiler(fields, options, config);
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parserCache.set(key, parser);
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return parser;
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}
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function setMaxCache(max) {
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parserCache = new LRU({ max });
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}
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function clearCache() {
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parserCache.clear();
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}
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module.exports = {
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getParser: getParser,
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setMaxCache: setMaxCache,
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clearCache: clearCache,
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_keyFromFields: keyFromFields,
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};
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