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645 lines
19 KiB
645 lines
19 KiB
4 years ago
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'use strict';
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const EventEmitter = require('events').EventEmitter;
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const crypto = require('crypto');
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const debugOptions = require('./utils').debugOptions;
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const parseHeader = require('../wireprotocol/shared').parseHeader;
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const decompress = require('../wireprotocol/compression').decompress;
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const Response = require('./commands').Response;
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const BinMsg = require('./msg').BinMsg;
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const MongoNetworkError = require('../error').MongoNetworkError;
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const MongoError = require('../error').MongoError;
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const Logger = require('./logger');
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const OP_COMPRESSED = require('../wireprotocol/shared').opcodes.OP_COMPRESSED;
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const OP_MSG = require('../wireprotocol/shared').opcodes.OP_MSG;
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const MESSAGE_HEADER_SIZE = require('../wireprotocol/shared').MESSAGE_HEADER_SIZE;
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const Buffer = require('safe-buffer').Buffer;
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let _id = 0;
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const DEFAULT_MAX_BSON_MESSAGE_SIZE = 1024 * 1024 * 16 * 4;
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const DEBUG_FIELDS = [
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'host',
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'port',
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'size',
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'keepAlive',
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'keepAliveInitialDelay',
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'noDelay',
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'connectionTimeout',
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'socketTimeout',
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'ssl',
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'ca',
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'crl',
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'cert',
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'rejectUnauthorized',
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'promoteLongs',
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'promoteValues',
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'promoteBuffers',
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'checkServerIdentity'
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];
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let connectionAccountingSpy = undefined;
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let connectionAccounting = false;
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let connections = {};
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/**
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* A class representing a single connection to a MongoDB server
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*
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* @fires Connection#connect
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* @fires Connection#close
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* @fires Connection#error
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* @fires Connection#timeout
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* @fires Connection#parseError
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* @fires Connection#message
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*/
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class Connection extends EventEmitter {
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/**
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* Creates a new Connection instance
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*
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* **NOTE**: Internal class, do not instantiate directly
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*
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* @param {Socket} socket The socket this connection wraps
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* @param {Object} options Various settings
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* @param {object} options.bson An implementation of bson serialize and deserialize
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* @param {string} [options.host='localhost'] The host the socket is connected to
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* @param {number} [options.port=27017] The port used for the socket connection
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* @param {boolean} [options.keepAlive=true] TCP Connection keep alive enabled
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* @param {number} [options.keepAliveInitialDelay=300000] Initial delay before TCP keep alive enabled
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* @param {number} [options.connectionTimeout=30000] TCP Connection timeout setting
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* @param {number} [options.socketTimeout=360000] TCP Socket timeout setting
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* @param {boolean} [options.promoteLongs] Convert Long values from the db into Numbers if they fit into 53 bits
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* @param {boolean} [options.promoteValues] Promotes BSON values to native types where possible, set to false to only receive wrapper types.
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* @param {boolean} [options.promoteBuffers] Promotes Binary BSON values to native Node Buffers.
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* @param {number} [options.maxBsonMessageSize=0x4000000] Largest possible size of a BSON message (for legacy purposes)
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*/
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constructor(socket, options) {
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super();
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options = options || {};
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if (!options.bson) {
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throw new TypeError('must pass in valid bson parser');
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}
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this.id = _id++;
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this.options = options;
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this.logger = Logger('Connection', options);
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this.bson = options.bson;
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this.tag = options.tag;
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this.maxBsonMessageSize = options.maxBsonMessageSize || DEFAULT_MAX_BSON_MESSAGE_SIZE;
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this.port = options.port || 27017;
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this.host = options.host || 'localhost';
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this.socketTimeout = typeof options.socketTimeout === 'number' ? options.socketTimeout : 360000;
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// These values are inspected directly in tests, but maybe not necessary to keep around
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this.keepAlive = typeof options.keepAlive === 'boolean' ? options.keepAlive : true;
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this.keepAliveInitialDelay =
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typeof options.keepAliveInitialDelay === 'number' ? options.keepAliveInitialDelay : 300000;
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this.connectionTimeout =
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typeof options.connectionTimeout === 'number' ? options.connectionTimeout : 30000;
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if (this.keepAliveInitialDelay > this.socketTimeout) {
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this.keepAliveInitialDelay = Math.round(this.socketTimeout / 2);
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}
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// Debug information
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if (this.logger.isDebug()) {
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this.logger.debug(
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`creating connection ${this.id} with options [${JSON.stringify(
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debugOptions(DEBUG_FIELDS, options)
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)}]`
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);
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}
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// Response options
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this.responseOptions = {
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promoteLongs: typeof options.promoteLongs === 'boolean' ? options.promoteLongs : true,
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promoteValues: typeof options.promoteValues === 'boolean' ? options.promoteValues : true,
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promoteBuffers: typeof options.promoteBuffers === 'boolean' ? options.promoteBuffers : false
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};
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// Flushing
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this.flushing = false;
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this.queue = [];
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// Internal state
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this.writeStream = null;
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this.destroyed = false;
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this.timedOut = false;
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// Create hash method
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const hash = crypto.createHash('sha1');
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hash.update(this.address);
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this.hashedName = hash.digest('hex');
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// All operations in flight on the connection
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this.workItems = [];
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// setup socket
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this.socket = socket;
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this.socket.once('error', errorHandler(this));
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this.socket.once('timeout', timeoutHandler(this));
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this.socket.once('close', closeHandler(this));
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this.socket.on('data', dataHandler(this));
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if (connectionAccounting) {
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addConnection(this.id, this);
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}
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}
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setSocketTimeout(value) {
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if (this.socket) {
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this.socket.setTimeout(value);
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}
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}
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resetSocketTimeout() {
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if (this.socket) {
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this.socket.setTimeout(this.socketTimeout);
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}
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}
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static enableConnectionAccounting(spy) {
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if (spy) {
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connectionAccountingSpy = spy;
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}
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connectionAccounting = true;
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connections = {};
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}
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static disableConnectionAccounting() {
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connectionAccounting = false;
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connectionAccountingSpy = undefined;
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}
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static connections() {
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return connections;
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}
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get address() {
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return `${this.host}:${this.port}`;
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}
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/**
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* Unref this connection
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* @method
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* @return {boolean}
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*/
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unref() {
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if (this.socket == null) {
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this.once('connect', () => this.socket.unref());
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return;
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}
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this.socket.unref();
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}
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/**
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* Flush all work Items on this connection
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*
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* @param {*} err The error to propagate to the flushed work items
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*/
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flush(err) {
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while (this.workItems.length > 0) {
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const workItem = this.workItems.shift();
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if (workItem.cb) {
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workItem.cb(err);
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}
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}
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}
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/**
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* Destroy connection
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* @method
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*/
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destroy(options, callback) {
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if (typeof options === 'function') {
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callback = options;
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options = {};
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}
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options = Object.assign({ force: false }, options);
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if (connectionAccounting) {
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deleteConnection(this.id);
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}
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if (this.socket == null) {
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this.destroyed = true;
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return;
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}
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if (options.force || this.timedOut) {
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this.socket.destroy();
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this.destroyed = true;
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if (typeof callback === 'function') callback(null, null);
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return;
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}
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this.socket.end(err => {
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this.destroyed = true;
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if (typeof callback === 'function') callback(err, null);
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});
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}
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/**
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* Write to connection
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* @method
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* @param {Command} command Command to write out need to implement toBin and toBinUnified
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*/
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write(buffer) {
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// Debug Log
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if (this.logger.isDebug()) {
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if (!Array.isArray(buffer)) {
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this.logger.debug(`writing buffer [${buffer.toString('hex')}] to ${this.address}`);
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} else {
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for (let i = 0; i < buffer.length; i++)
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this.logger.debug(`writing buffer [${buffer[i].toString('hex')}] to ${this.address}`);
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}
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}
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// Double check that the connection is not destroyed
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if (this.socket.destroyed === false) {
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// Write out the command
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if (!Array.isArray(buffer)) {
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this.socket.write(buffer, 'binary');
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return true;
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}
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// Iterate over all buffers and write them in order to the socket
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for (let i = 0; i < buffer.length; i++) {
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this.socket.write(buffer[i], 'binary');
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}
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return true;
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}
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// Connection is destroyed return write failed
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return false;
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}
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/**
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* Return id of connection as a string
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* @method
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* @return {string}
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*/
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toString() {
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return '' + this.id;
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}
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/**
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* Return json object of connection
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* @method
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* @return {object}
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*/
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toJSON() {
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return { id: this.id, host: this.host, port: this.port };
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}
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/**
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* Is the connection connected
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* @method
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* @return {boolean}
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*/
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isConnected() {
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if (this.destroyed) return false;
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return !this.socket.destroyed && this.socket.writable;
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}
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}
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function deleteConnection(id) {
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// console.log("=== deleted connection " + id + " :: " + (connections[id] ? connections[id].port : ''))
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delete connections[id];
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if (connectionAccountingSpy) {
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connectionAccountingSpy.deleteConnection(id);
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}
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}
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function addConnection(id, connection) {
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// console.log("=== added connection " + id + " :: " + connection.port)
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connections[id] = connection;
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if (connectionAccountingSpy) {
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connectionAccountingSpy.addConnection(id, connection);
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}
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}
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//
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// Connection handlers
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function errorHandler(conn) {
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return function(err) {
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if (connectionAccounting) deleteConnection(conn.id);
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// Debug information
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if (conn.logger.isDebug()) {
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conn.logger.debug(
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`connection ${conn.id} for [${conn.address}] errored out with [${JSON.stringify(err)}]`
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);
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}
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conn.emit('error', new MongoNetworkError(err), conn);
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};
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}
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function timeoutHandler(conn) {
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return function() {
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if (connectionAccounting) deleteConnection(conn.id);
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if (conn.logger.isDebug()) {
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conn.logger.debug(`connection ${conn.id} for [${conn.address}] timed out`);
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}
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conn.timedOut = true;
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conn.emit(
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'timeout',
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new MongoNetworkError(`connection ${conn.id} to ${conn.address} timed out`),
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conn
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);
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};
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}
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function closeHandler(conn) {
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return function(hadError) {
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if (connectionAccounting) deleteConnection(conn.id);
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if (conn.logger.isDebug()) {
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conn.logger.debug(`connection ${conn.id} with for [${conn.address}] closed`);
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}
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if (!hadError) {
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conn.emit(
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'close',
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new MongoNetworkError(`connection ${conn.id} to ${conn.address} closed`),
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conn
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);
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}
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};
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}
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// Handle a message once it is received
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function processMessage(conn, message) {
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const msgHeader = parseHeader(message);
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if (msgHeader.opCode !== OP_COMPRESSED) {
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const ResponseConstructor = msgHeader.opCode === OP_MSG ? BinMsg : Response;
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conn.emit(
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'message',
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new ResponseConstructor(
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conn.bson,
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message,
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msgHeader,
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message.slice(MESSAGE_HEADER_SIZE),
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conn.responseOptions
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),
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conn
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);
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return;
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}
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msgHeader.fromCompressed = true;
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let index = MESSAGE_HEADER_SIZE;
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msgHeader.opCode = message.readInt32LE(index);
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index += 4;
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msgHeader.length = message.readInt32LE(index);
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index += 4;
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const compressorID = message[index];
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index++;
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decompress(compressorID, message.slice(index), (err, decompressedMsgBody) => {
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if (err) {
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conn.emit('error', err);
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return;
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}
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if (decompressedMsgBody.length !== msgHeader.length) {
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conn.emit(
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'error',
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new MongoError(
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'Decompressing a compressed message from the server failed. The message is corrupt.'
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)
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);
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return;
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}
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const ResponseConstructor = msgHeader.opCode === OP_MSG ? BinMsg : Response;
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conn.emit(
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'message',
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new ResponseConstructor(
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conn.bson,
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message,
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msgHeader,
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decompressedMsgBody,
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conn.responseOptions
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),
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conn
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);
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});
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}
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function dataHandler(conn) {
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return function(data) {
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// Parse until we are done with the data
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||
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while (data.length > 0) {
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// If we still have bytes to read on the current message
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if (conn.bytesRead > 0 && conn.sizeOfMessage > 0) {
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// Calculate the amount of remaining bytes
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const remainingBytesToRead = conn.sizeOfMessage - conn.bytesRead;
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// Check if the current chunk contains the rest of the message
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if (remainingBytesToRead > data.length) {
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// Copy the new data into the exiting buffer (should have been allocated when we know the message size)
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data.copy(conn.buffer, conn.bytesRead);
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// Adjust the number of bytes read so it point to the correct index in the buffer
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conn.bytesRead = conn.bytesRead + data.length;
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// Reset state of buffer
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data = Buffer.alloc(0);
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} else {
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// Copy the missing part of the data into our current buffer
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data.copy(conn.buffer, conn.bytesRead, 0, remainingBytesToRead);
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// Slice the overflow into a new buffer that we will then re-parse
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data = data.slice(remainingBytesToRead);
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// Emit current complete message
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const emitBuffer = conn.buffer;
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// Reset state of buffer
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conn.buffer = null;
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conn.sizeOfMessage = 0;
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conn.bytesRead = 0;
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conn.stubBuffer = null;
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|
|
||
|
processMessage(conn, emitBuffer);
|
||
|
}
|
||
|
} else {
|
||
|
// Stub buffer is kept in case we don't get enough bytes to determine the
|
||
|
// size of the message (< 4 bytes)
|
||
|
if (conn.stubBuffer != null && conn.stubBuffer.length > 0) {
|
||
|
// If we have enough bytes to determine the message size let's do it
|
||
|
if (conn.stubBuffer.length + data.length > 4) {
|
||
|
// Prepad the data
|
||
|
const newData = Buffer.alloc(conn.stubBuffer.length + data.length);
|
||
|
conn.stubBuffer.copy(newData, 0);
|
||
|
data.copy(newData, conn.stubBuffer.length);
|
||
|
// Reassign for parsing
|
||
|
data = newData;
|
||
|
|
||
|
// Reset state of buffer
|
||
|
conn.buffer = null;
|
||
|
conn.sizeOfMessage = 0;
|
||
|
conn.bytesRead = 0;
|
||
|
conn.stubBuffer = null;
|
||
|
} else {
|
||
|
// Add the the bytes to the stub buffer
|
||
|
const newStubBuffer = Buffer.alloc(conn.stubBuffer.length + data.length);
|
||
|
// Copy existing stub buffer
|
||
|
conn.stubBuffer.copy(newStubBuffer, 0);
|
||
|
// Copy missing part of the data
|
||
|
data.copy(newStubBuffer, conn.stubBuffer.length);
|
||
|
// Exit parsing loop
|
||
|
data = Buffer.alloc(0);
|
||
|
}
|
||
|
} else {
|
||
|
if (data.length > 4) {
|
||
|
// Retrieve the message size
|
||
|
const sizeOfMessage = data[0] | (data[1] << 8) | (data[2] << 16) | (data[3] << 24);
|
||
|
// If we have a negative sizeOfMessage emit error and return
|
||
|
if (sizeOfMessage < 0 || sizeOfMessage > conn.maxBsonMessageSize) {
|
||
|
const errorObject = {
|
||
|
err: 'socketHandler',
|
||
|
trace: '',
|
||
|
bin: conn.buffer,
|
||
|
parseState: {
|
||
|
sizeOfMessage: sizeOfMessage,
|
||
|
bytesRead: conn.bytesRead,
|
||
|
stubBuffer: conn.stubBuffer
|
||
|
}
|
||
|
};
|
||
|
// We got a parse Error fire it off then keep going
|
||
|
conn.emit('parseError', errorObject, conn);
|
||
|
return;
|
||
|
}
|
||
|
|
||
|
// Ensure that the size of message is larger than 0 and less than the max allowed
|
||
|
if (
|
||
|
sizeOfMessage > 4 &&
|
||
|
sizeOfMessage < conn.maxBsonMessageSize &&
|
||
|
sizeOfMessage > data.length
|
||
|
) {
|
||
|
conn.buffer = Buffer.alloc(sizeOfMessage);
|
||
|
// Copy all the data into the buffer
|
||
|
data.copy(conn.buffer, 0);
|
||
|
// Update bytes read
|
||
|
conn.bytesRead = data.length;
|
||
|
// Update sizeOfMessage
|
||
|
conn.sizeOfMessage = sizeOfMessage;
|
||
|
// Ensure stub buffer is null
|
||
|
conn.stubBuffer = null;
|
||
|
// Exit parsing loop
|
||
|
data = Buffer.alloc(0);
|
||
|
} else if (
|
||
|
sizeOfMessage > 4 &&
|
||
|
sizeOfMessage < conn.maxBsonMessageSize &&
|
||
|
sizeOfMessage === data.length
|
||
|
) {
|
||
|
const emitBuffer = data;
|
||
|
// Reset state of buffer
|
||
|
conn.buffer = null;
|
||
|
conn.sizeOfMessage = 0;
|
||
|
conn.bytesRead = 0;
|
||
|
conn.stubBuffer = null;
|
||
|
// Exit parsing loop
|
||
|
data = Buffer.alloc(0);
|
||
|
// Emit the message
|
||
|
processMessage(conn, emitBuffer);
|
||
|
} else if (sizeOfMessage <= 4 || sizeOfMessage > conn.maxBsonMessageSize) {
|
||
|
const errorObject = {
|
||
|
err: 'socketHandler',
|
||
|
trace: null,
|
||
|
bin: data,
|
||
|
parseState: {
|
||
|
sizeOfMessage: sizeOfMessage,
|
||
|
bytesRead: 0,
|
||
|
buffer: null,
|
||
|
stubBuffer: null
|
||
|
}
|
||
|
};
|
||
|
// We got a parse Error fire it off then keep going
|
||
|
conn.emit('parseError', errorObject, conn);
|
||
|
|
||
|
// Clear out the state of the parser
|
||
|
conn.buffer = null;
|
||
|
conn.sizeOfMessage = 0;
|
||
|
conn.bytesRead = 0;
|
||
|
conn.stubBuffer = null;
|
||
|
// Exit parsing loop
|
||
|
data = Buffer.alloc(0);
|
||
|
} else {
|
||
|
const emitBuffer = data.slice(0, sizeOfMessage);
|
||
|
// Reset state of buffer
|
||
|
conn.buffer = null;
|
||
|
conn.sizeOfMessage = 0;
|
||
|
conn.bytesRead = 0;
|
||
|
conn.stubBuffer = null;
|
||
|
// Copy rest of message
|
||
|
data = data.slice(sizeOfMessage);
|
||
|
// Emit the message
|
||
|
processMessage(conn, emitBuffer);
|
||
|
}
|
||
|
} else {
|
||
|
// Create a buffer that contains the space for the non-complete message
|
||
|
conn.stubBuffer = Buffer.alloc(data.length);
|
||
|
// Copy the data to the stub buffer
|
||
|
data.copy(conn.stubBuffer, 0);
|
||
|
// Exit parsing loop
|
||
|
data = Buffer.alloc(0);
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
};
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* A server connect event, used to verify that the connection is up and running
|
||
|
*
|
||
|
* @event Connection#connect
|
||
|
* @type {Connection}
|
||
|
*/
|
||
|
|
||
|
/**
|
||
|
* The server connection closed, all pool connections closed
|
||
|
*
|
||
|
* @event Connection#close
|
||
|
* @type {Connection}
|
||
|
*/
|
||
|
|
||
|
/**
|
||
|
* The server connection caused an error, all pool connections closed
|
||
|
*
|
||
|
* @event Connection#error
|
||
|
* @type {Connection}
|
||
|
*/
|
||
|
|
||
|
/**
|
||
|
* The server connection timed out, all pool connections closed
|
||
|
*
|
||
|
* @event Connection#timeout
|
||
|
* @type {Connection}
|
||
|
*/
|
||
|
|
||
|
/**
|
||
|
* The driver experienced an invalid message, all pool connections closed
|
||
|
*
|
||
|
* @event Connection#parseError
|
||
|
* @type {Connection}
|
||
|
*/
|
||
|
|
||
|
/**
|
||
|
* An event emitted each time the connection receives a parsed message from the wire
|
||
|
*
|
||
|
* @event Connection#message
|
||
|
* @type {Connection}
|
||
|
*/
|
||
|
|
||
|
module.exports = Connection;
|