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9756872 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 | "use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.decompressResponse = exports.compressCommand = exports.decompress = exports.compress = exports.uncompressibleCommands = exports.Compressor = void 0;
const util_1 = require("util");
const zlib = require("zlib");
const constants_1 = require("../../constants");
const deps_1 = require("../../deps");
const error_1 = require("../../error");
const commands_1 = require("../commands");
const constants_2 = require("./constants");
/** @public */
exports.Compressor = Object.freeze({
none: 0,
snappy: 1,
zlib: 2,
zstd: 3
});
exports.uncompressibleCommands = new Set([
constants_1.LEGACY_HELLO_COMMAND,
'saslStart',
'saslContinue',
'getnonce',
'authenticate',
'createUser',
'updateUser',
'copydbSaslStart',
'copydbgetnonce',
'copydb'
]);
const ZSTD_COMPRESSION_LEVEL = 3;
const zlibInflate = (0, util_1.promisify)(zlib.inflate.bind(zlib));
const zlibDeflate = (0, util_1.promisify)(zlib.deflate.bind(zlib));
let zstd;
let Snappy = null;
function loadSnappy() {
if (Snappy == null) {
const snappyImport = (0, deps_1.getSnappy)();
if ('kModuleError' in snappyImport) {
throw snappyImport.kModuleError;
}
Snappy = snappyImport;
}
return Snappy;
}
// Facilitate compressing a message using an agreed compressor
async function compress(options, dataToBeCompressed) {
const zlibOptions = {};
switch (options.agreedCompressor) {
case 'snappy': {
Snappy ??= loadSnappy();
return await Snappy.compress(dataToBeCompressed);
}
case 'zstd': {
loadZstd();
if ('kModuleError' in zstd) {
throw zstd['kModuleError'];
}
return await zstd.compress(dataToBeCompressed, ZSTD_COMPRESSION_LEVEL);
}
case 'zlib': {
if (options.zlibCompressionLevel) {
zlibOptions.level = options.zlibCompressionLevel;
}
return await zlibDeflate(dataToBeCompressed, zlibOptions);
}
default: {
throw new error_1.MongoInvalidArgumentError(`Unknown compressor ${options.agreedCompressor} failed to compress`);
}
}
}
exports.compress = compress;
// Decompress a message using the given compressor
async function decompress(compressorID, compressedData) {
if (compressorID !== exports.Compressor.snappy &&
compressorID !== exports.Compressor.zstd &&
compressorID !== exports.Compressor.zlib &&
compressorID !== exports.Compressor.none) {
throw new error_1.MongoDecompressionError(`Server sent message compressed using an unsupported compressor. (Received compressor ID ${compressorID})`);
}
switch (compressorID) {
case exports.Compressor.snappy: {
Snappy ??= loadSnappy();
return await Snappy.uncompress(compressedData, { asBuffer: true });
}
case exports.Compressor.zstd: {
loadZstd();
if ('kModuleError' in zstd) {
throw zstd['kModuleError'];
}
return await zstd.decompress(compressedData);
}
case exports.Compressor.zlib: {
return await zlibInflate(compressedData);
}
default: {
return compressedData;
}
}
}
exports.decompress = decompress;
/**
* Load ZStandard if it is not already set.
*/
function loadZstd() {
if (!zstd) {
zstd = (0, deps_1.getZstdLibrary)();
}
}
const MESSAGE_HEADER_SIZE = 16;
/**
* @internal
*
* Compresses an OP_MSG or OP_QUERY message, if compression is configured. This method
* also serializes the command to BSON.
*/
async function compressCommand(command, description) {
const finalCommand = description.agreedCompressor === 'none' || !commands_1.OpCompressedRequest.canCompress(command)
? command
: new commands_1.OpCompressedRequest(command, {
agreedCompressor: description.agreedCompressor ?? 'none',
zlibCompressionLevel: description.zlibCompressionLevel ?? 0
});
const data = await finalCommand.toBin();
return Buffer.concat(data);
}
exports.compressCommand = compressCommand;
/**
* @internal
*
* Decompresses an OP_MSG or OP_QUERY response from the server, if compression is configured.
*
* This method does not parse the response's BSON.
*/
async function decompressResponse(message) {
const messageHeader = {
length: message.readInt32LE(0),
requestId: message.readInt32LE(4),
responseTo: message.readInt32LE(8),
opCode: message.readInt32LE(12)
};
if (messageHeader.opCode !== constants_2.OP_COMPRESSED) {
const ResponseType = messageHeader.opCode === constants_2.OP_MSG ? commands_1.OpMsgResponse : commands_1.OpReply;
const messageBody = message.subarray(MESSAGE_HEADER_SIZE);
return new ResponseType(message, messageHeader, messageBody);
}
const header = {
...messageHeader,
fromCompressed: true,
opCode: message.readInt32LE(MESSAGE_HEADER_SIZE),
length: message.readInt32LE(MESSAGE_HEADER_SIZE + 4)
};
const compressorID = message[MESSAGE_HEADER_SIZE + 8];
const compressedBuffer = message.slice(MESSAGE_HEADER_SIZE + 9);
// recalculate based on wrapped opcode
const ResponseType = header.opCode === constants_2.OP_MSG ? commands_1.OpMsgResponse : commands_1.OpReply;
const messageBody = await decompress(compressorID, compressedBuffer);
if (messageBody.length !== header.length) {
throw new error_1.MongoDecompressionError('Message body and message header must be the same length');
}
return new ResponseType(message, header, messageBody);
}
exports.decompressResponse = decompressResponse;
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