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81 lines
3.0 KiB
81 lines
3.0 KiB
3 years ago
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"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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// 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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if ('kModuleError' in deps_1.Snappy) {
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throw deps_1.Snappy['kModuleError'];
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}
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return deps_1.Snappy.compress(dataToBeCompressed);
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case 'zstd':
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if ('kModuleError' in deps_1.ZStandard) {
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throw deps_1.ZStandard['kModuleError'];
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}
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return deps_1.ZStandard.compress(dataToBeCompressed, ZSTD_COMPRESSION_LEVEL);
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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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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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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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if ('kModuleError' in deps_1.Snappy) {
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throw deps_1.Snappy['kModuleError'];
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}
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return deps_1.Snappy.uncompress(compressedData, { asBuffer: true });
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case exports.Compressor.zstd:
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if ('kModuleError' in deps_1.ZStandard) {
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throw deps_1.ZStandard['kModuleError'];
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}
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return deps_1.ZStandard.decompress(compressedData);
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case exports.Compressor.zlib:
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return zlibInflate(compressedData);
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default:
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return compressedData;
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}
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}
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exports.decompress = decompress;
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//# sourceMappingURL=compression.js.map
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