60 lines
1.3 KiB
JavaScript
60 lines
1.3 KiB
JavaScript
'use strict';
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const LRU = require('lru-cache');
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const 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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let res =
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`${type}` +
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`/${typeof options.nestTables}` +
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`/${options.nestTables}` +
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`/${options.rowsAsArray}` +
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`/${options.supportBigNumbers || config.supportBigNumbers}` +
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`/${options.bigNumberStrings || config.bigNumberStrings}` +
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`/${typeof options.typeCast}` +
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`/${options.timezone || config.timezone}` +
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`/${options.decimalNumbers}` +
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`/${options.dateStrings}`;
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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 += `/${field.name}:${field.columnType}:${field.flags}:${
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field.characterSet
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}`;
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if (options.nestTables) {
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res += `:${field.table}`
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}
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}
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return res;
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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.max = max;
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}
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function clearCache() {
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parserCache.reset();
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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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};
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