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107 lines
3.4 KiB
JavaScript
107 lines
3.4 KiB
JavaScript
"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.decompress = exports.compress = exports.uncompressibleCommands = exports.Compressor = void 0;
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const util_1 = require("util");
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const zlib = require("zlib");
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const constants_1 = require("../../constants");
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const deps_1 = require("../../deps");
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const error_1 = require("../../error");
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/** @public */
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exports.Compressor = Object.freeze({
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none: 0,
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snappy: 1,
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zlib: 2,
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zstd: 3
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});
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exports.uncompressibleCommands = new Set([
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constants_1.LEGACY_HELLO_COMMAND,
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'saslStart',
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'saslContinue',
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'getnonce',
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'authenticate',
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'createUser',
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'updateUser',
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'copydbSaslStart',
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'copydbgetnonce',
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'copydb'
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]);
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const ZSTD_COMPRESSION_LEVEL = 3;
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const zlibInflate = (0, util_1.promisify)(zlib.inflate.bind(zlib));
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const zlibDeflate = (0, util_1.promisify)(zlib.deflate.bind(zlib));
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let zstd;
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let Snappy = null;
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function loadSnappy() {
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if (Snappy == null) {
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const snappyImport = (0, deps_1.getSnappy)();
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if ('kModuleError' in snappyImport) {
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throw snappyImport.kModuleError;
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}
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Snappy = snappyImport;
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}
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return Snappy;
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}
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// Facilitate compressing a message using an agreed compressor
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async function compress(options, dataToBeCompressed) {
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const zlibOptions = {};
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switch (options.agreedCompressor) {
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case 'snappy': {
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Snappy ??= loadSnappy();
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return Snappy.compress(dataToBeCompressed);
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}
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case 'zstd': {
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loadZstd();
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if ('kModuleError' in zstd) {
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throw zstd['kModuleError'];
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}
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return zstd.compress(dataToBeCompressed, ZSTD_COMPRESSION_LEVEL);
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}
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case 'zlib': {
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if (options.zlibCompressionLevel) {
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zlibOptions.level = options.zlibCompressionLevel;
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}
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return zlibDeflate(dataToBeCompressed, zlibOptions);
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}
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default: {
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throw new error_1.MongoInvalidArgumentError(`Unknown compressor ${options.agreedCompressor} failed to compress`);
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}
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}
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}
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exports.compress = compress;
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// Decompress a message using the given compressor
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async function decompress(compressorID, compressedData) {
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if (compressorID !== exports.Compressor.snappy &&
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compressorID !== exports.Compressor.zstd &&
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compressorID !== exports.Compressor.zlib &&
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compressorID !== exports.Compressor.none) {
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throw new error_1.MongoDecompressionError(`Server sent message compressed using an unsupported compressor. (Received compressor ID ${compressorID})`);
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}
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switch (compressorID) {
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case exports.Compressor.snappy: {
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Snappy ??= loadSnappy();
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return Snappy.uncompress(compressedData, { asBuffer: true });
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}
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case exports.Compressor.zstd: {
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loadZstd();
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if ('kModuleError' in zstd) {
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throw zstd['kModuleError'];
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}
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return zstd.decompress(compressedData);
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}
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case exports.Compressor.zlib: {
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return zlibInflate(compressedData);
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}
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default: {
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return compressedData;
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}
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}
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}
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exports.decompress = decompress;
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/**
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* Load ZStandard if it is not already set.
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*/
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function loadZstd() {
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if (!zstd) {
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zstd = (0, deps_1.getZstdLibrary)();
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}
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}
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//# sourceMappingURL=compression.js.map
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