598 lines
25 KiB
JavaScript
598 lines
25 KiB
JavaScript
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"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.ConnectionPool = exports.PoolState = void 0;
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const timers_1 = require("timers");
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const constants_1 = require("../constants");
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const error_1 = require("../error");
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const logger_1 = require("../logger");
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const mongo_types_1 = require("../mongo_types");
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const utils_1 = require("../utils");
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const connect_1 = require("./connect");
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const connection_1 = require("./connection");
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const connection_pool_events_1 = require("./connection_pool_events");
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const errors_1 = require("./errors");
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const metrics_1 = require("./metrics");
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/** @internal */
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const kServer = Symbol('server');
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/** @internal */
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const kLogger = Symbol('logger');
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/** @internal */
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const kConnections = Symbol('connections');
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/** @internal */
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const kPending = Symbol('pending');
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/** @internal */
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const kCheckedOut = Symbol('checkedOut');
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/** @internal */
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const kMinPoolSizeTimer = Symbol('minPoolSizeTimer');
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/** @internal */
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const kGeneration = Symbol('generation');
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/** @internal */
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const kServiceGenerations = Symbol('serviceGenerations');
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/** @internal */
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const kConnectionCounter = Symbol('connectionCounter');
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/** @internal */
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const kCancellationToken = Symbol('cancellationToken');
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/** @internal */
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const kWaitQueue = Symbol('waitQueue');
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/** @internal */
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const kCancelled = Symbol('cancelled');
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/** @internal */
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const kMetrics = Symbol('metrics');
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/** @internal */
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const kProcessingWaitQueue = Symbol('processingWaitQueue');
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/** @internal */
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const kPoolState = Symbol('poolState');
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/** @internal */
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exports.PoolState = Object.freeze({
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paused: 'paused',
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ready: 'ready',
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closed: 'closed'
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});
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/**
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* A pool of connections which dynamically resizes, and emit events related to pool activity
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* @internal
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*/
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class ConnectionPool extends mongo_types_1.TypedEventEmitter {
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constructor(server, options) {
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var _a, _b, _c, _d, _e, _f;
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super();
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this.options = Object.freeze({
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...options,
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connectionType: connection_1.Connection,
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maxPoolSize: (_a = options.maxPoolSize) !== null && _a !== void 0 ? _a : 100,
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minPoolSize: (_b = options.minPoolSize) !== null && _b !== void 0 ? _b : 0,
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maxConnecting: (_c = options.maxConnecting) !== null && _c !== void 0 ? _c : 2,
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maxIdleTimeMS: (_d = options.maxIdleTimeMS) !== null && _d !== void 0 ? _d : 0,
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waitQueueTimeoutMS: (_e = options.waitQueueTimeoutMS) !== null && _e !== void 0 ? _e : 0,
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minPoolSizeCheckFrequencyMS: (_f = options.minPoolSizeCheckFrequencyMS) !== null && _f !== void 0 ? _f : 100,
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autoEncrypter: options.autoEncrypter,
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metadata: options.metadata
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});
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if (this.options.minPoolSize > this.options.maxPoolSize) {
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throw new error_1.MongoInvalidArgumentError('Connection pool minimum size must not be greater than maximum pool size');
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}
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this[kPoolState] = exports.PoolState.paused;
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this[kServer] = server;
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this[kLogger] = new logger_1.Logger('ConnectionPool');
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this[kConnections] = new utils_1.List();
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this[kPending] = 0;
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this[kCheckedOut] = new Set();
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this[kMinPoolSizeTimer] = undefined;
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this[kGeneration] = 0;
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this[kServiceGenerations] = new Map();
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this[kConnectionCounter] = (0, utils_1.makeCounter)(1);
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this[kCancellationToken] = new mongo_types_1.CancellationToken();
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this[kCancellationToken].setMaxListeners(Infinity);
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this[kWaitQueue] = new utils_1.List();
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this[kMetrics] = new metrics_1.ConnectionPoolMetrics();
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this[kProcessingWaitQueue] = false;
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process.nextTick(() => {
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this.emit(ConnectionPool.CONNECTION_POOL_CREATED, new connection_pool_events_1.ConnectionPoolCreatedEvent(this));
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});
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}
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/** The address of the endpoint the pool is connected to */
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get address() {
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return this.options.hostAddress.toString();
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}
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/**
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* Check if the pool has been closed
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*
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* TODO(NODE-3263): We can remove this property once shell no longer needs it
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*/
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get closed() {
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return this[kPoolState] === exports.PoolState.closed;
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}
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/** An integer representing the SDAM generation of the pool */
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get generation() {
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return this[kGeneration];
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}
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/** An integer expressing how many total connections (available + pending + in use) the pool currently has */
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get totalConnectionCount() {
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return (this.availableConnectionCount + this.pendingConnectionCount + this.currentCheckedOutCount);
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}
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/** An integer expressing how many connections are currently available in the pool. */
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get availableConnectionCount() {
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return this[kConnections].length;
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}
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get pendingConnectionCount() {
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return this[kPending];
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}
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get currentCheckedOutCount() {
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return this[kCheckedOut].size;
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}
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get waitQueueSize() {
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return this[kWaitQueue].length;
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}
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get loadBalanced() {
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return this.options.loadBalanced;
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}
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get serviceGenerations() {
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return this[kServiceGenerations];
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}
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get serverError() {
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return this[kServer].description.error;
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}
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/**
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* This is exposed ONLY for use in mongosh, to enable
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* killing all connections if a user quits the shell with
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* operations in progress.
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*
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* This property may be removed as a part of NODE-3263.
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*/
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get checkedOutConnections() {
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return this[kCheckedOut];
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}
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/**
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* Get the metrics information for the pool when a wait queue timeout occurs.
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*/
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waitQueueErrorMetrics() {
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return this[kMetrics].info(this.options.maxPoolSize);
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}
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/**
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* Set the pool state to "ready"
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*/
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ready() {
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if (this[kPoolState] !== exports.PoolState.paused) {
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return;
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}
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this[kPoolState] = exports.PoolState.ready;
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this.emit(ConnectionPool.CONNECTION_POOL_READY, new connection_pool_events_1.ConnectionPoolReadyEvent(this));
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(0, timers_1.clearTimeout)(this[kMinPoolSizeTimer]);
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this.ensureMinPoolSize();
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}
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/**
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* Check a connection out of this pool. The connection will continue to be tracked, but no reference to it
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* will be held by the pool. This means that if a connection is checked out it MUST be checked back in or
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* explicitly destroyed by the new owner.
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*/
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checkOut(callback) {
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this.emit(ConnectionPool.CONNECTION_CHECK_OUT_STARTED, new connection_pool_events_1.ConnectionCheckOutStartedEvent(this));
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const waitQueueMember = { callback };
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const waitQueueTimeoutMS = this.options.waitQueueTimeoutMS;
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if (waitQueueTimeoutMS) {
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waitQueueMember.timer = (0, timers_1.setTimeout)(() => {
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waitQueueMember[kCancelled] = true;
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waitQueueMember.timer = undefined;
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this.emit(ConnectionPool.CONNECTION_CHECK_OUT_FAILED, new connection_pool_events_1.ConnectionCheckOutFailedEvent(this, 'timeout'));
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waitQueueMember.callback(new errors_1.WaitQueueTimeoutError(this.loadBalanced
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? this.waitQueueErrorMetrics()
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: 'Timed out while checking out a connection from connection pool', this.address));
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}, waitQueueTimeoutMS);
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}
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this[kWaitQueue].push(waitQueueMember);
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process.nextTick(() => this.processWaitQueue());
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}
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/**
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* Check a connection into the pool.
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*
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* @param connection - The connection to check in
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*/
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checkIn(connection) {
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if (!this[kCheckedOut].has(connection)) {
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return;
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}
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const poolClosed = this.closed;
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const stale = this.connectionIsStale(connection);
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const willDestroy = !!(poolClosed || stale || connection.closed);
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if (!willDestroy) {
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connection.markAvailable();
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this[kConnections].unshift(connection);
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}
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this[kCheckedOut].delete(connection);
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this.emit(ConnectionPool.CONNECTION_CHECKED_IN, new connection_pool_events_1.ConnectionCheckedInEvent(this, connection));
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if (willDestroy) {
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const reason = connection.closed ? 'error' : poolClosed ? 'poolClosed' : 'stale';
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this.destroyConnection(connection, reason);
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}
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process.nextTick(() => this.processWaitQueue());
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}
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/**
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* Clear the pool
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*
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* Pool reset is handled by incrementing the pool's generation count. Any existing connection of a
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* previous generation will eventually be pruned during subsequent checkouts.
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*/
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clear(options = {}) {
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var _a;
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if (this.closed) {
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return;
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}
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// handle load balanced case
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if (this.loadBalanced) {
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const { serviceId } = options;
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if (!serviceId) {
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throw new error_1.MongoRuntimeError('ConnectionPool.clear() called in load balanced mode with no serviceId.');
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}
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const sid = serviceId.toHexString();
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const generation = this.serviceGenerations.get(sid);
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// Only need to worry if the generation exists, since it should
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// always be there but typescript needs the check.
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if (generation == null) {
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throw new error_1.MongoRuntimeError('Service generations are required in load balancer mode.');
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}
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else {
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// Increment the generation for the service id.
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this.serviceGenerations.set(sid, generation + 1);
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}
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this.emit(ConnectionPool.CONNECTION_POOL_CLEARED, new connection_pool_events_1.ConnectionPoolClearedEvent(this, { serviceId }));
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return;
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}
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// handle non load-balanced case
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const interruptInUseConnections = (_a = options.interruptInUseConnections) !== null && _a !== void 0 ? _a : false;
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const oldGeneration = this[kGeneration];
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this[kGeneration] += 1;
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const alreadyPaused = this[kPoolState] === exports.PoolState.paused;
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this[kPoolState] = exports.PoolState.paused;
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this.clearMinPoolSizeTimer();
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if (!alreadyPaused) {
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this.emit(ConnectionPool.CONNECTION_POOL_CLEARED, new connection_pool_events_1.ConnectionPoolClearedEvent(this, { interruptInUseConnections }));
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}
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if (interruptInUseConnections) {
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process.nextTick(() => this.interruptInUseConnections(oldGeneration));
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}
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this.processWaitQueue();
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}
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/**
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* Closes all stale in-use connections in the pool with a resumable PoolClearedOnNetworkError.
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*
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* Only connections where `connection.generation <= minGeneration` are killed.
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*/
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interruptInUseConnections(minGeneration) {
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for (const connection of this[kCheckedOut]) {
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if (connection.generation <= minGeneration) {
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this.checkIn(connection);
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connection.onError(new errors_1.PoolClearedOnNetworkError(this));
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}
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}
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}
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close(_options, _cb) {
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let options = _options;
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const callback = (_cb !== null && _cb !== void 0 ? _cb : _options);
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if (typeof options === 'function') {
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options = {};
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}
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options = Object.assign({ force: false }, options);
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if (this.closed) {
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return callback();
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}
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// immediately cancel any in-flight connections
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this[kCancellationToken].emit('cancel');
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// end the connection counter
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if (typeof this[kConnectionCounter].return === 'function') {
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this[kConnectionCounter].return(undefined);
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}
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this[kPoolState] = exports.PoolState.closed;
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this.clearMinPoolSizeTimer();
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this.processWaitQueue();
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(0, utils_1.eachAsync)(this[kConnections].toArray(), (conn, cb) => {
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this.emit(ConnectionPool.CONNECTION_CLOSED, new connection_pool_events_1.ConnectionClosedEvent(this, conn, 'poolClosed'));
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conn.destroy(options, cb);
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}, err => {
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this[kConnections].clear();
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this.emit(ConnectionPool.CONNECTION_POOL_CLOSED, new connection_pool_events_1.ConnectionPoolClosedEvent(this));
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callback(err);
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});
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}
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/**
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* Runs a lambda with an implicitly checked out connection, checking that connection back in when the lambda
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* has completed by calling back.
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*
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* NOTE: please note the required signature of `fn`
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*
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* @remarks When in load balancer mode, connections can be pinned to cursors or transactions.
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* In these cases we pass the connection in to this method to ensure it is used and a new
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* connection is not checked out.
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*
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* @param conn - A pinned connection for use in load balancing mode.
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* @param fn - A function which operates on a managed connection
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* @param callback - The original callback
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*/
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withConnection(conn, fn, callback) {
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if (conn) {
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// use the provided connection, and do _not_ check it in after execution
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fn(undefined, conn, (fnErr, result) => {
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if (typeof callback === 'function') {
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if (fnErr) {
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callback(fnErr);
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}
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else {
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callback(undefined, result);
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}
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}
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});
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return;
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}
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this.checkOut((err, conn) => {
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// don't callback with `err` here, we might want to act upon it inside `fn`
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fn(err, conn, (fnErr, result) => {
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if (typeof callback === 'function') {
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if (fnErr) {
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callback(fnErr);
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}
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else {
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callback(undefined, result);
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}
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}
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if (conn) {
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this.checkIn(conn);
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}
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});
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});
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}
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/** Clear the min pool size timer */
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clearMinPoolSizeTimer() {
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const minPoolSizeTimer = this[kMinPoolSizeTimer];
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if (minPoolSizeTimer) {
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(0, timers_1.clearTimeout)(minPoolSizeTimer);
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}
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}
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destroyConnection(connection, reason) {
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this.emit(ConnectionPool.CONNECTION_CLOSED, new connection_pool_events_1.ConnectionClosedEvent(this, connection, reason));
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// destroy the connection
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process.nextTick(() => connection.destroy());
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}
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connectionIsStale(connection) {
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const serviceId = connection.serviceId;
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|
|
if (this.loadBalanced && serviceId) {
|
||
|
|
const sid = serviceId.toHexString();
|
||
|
|
const generation = this.serviceGenerations.get(sid);
|
||
|
|
return connection.generation !== generation;
|
||
|
|
}
|
||
|
|
return connection.generation !== this[kGeneration];
|
||
|
|
}
|
||
|
|
connectionIsIdle(connection) {
|
||
|
|
return !!(this.options.maxIdleTimeMS && connection.idleTime > this.options.maxIdleTimeMS);
|
||
|
|
}
|
||
|
|
/**
|
||
|
|
* Destroys a connection if the connection is perished.
|
||
|
|
*
|
||
|
|
* @returns `true` if the connection was destroyed, `false` otherwise.
|
||
|
|
*/
|
||
|
|
destroyConnectionIfPerished(connection) {
|
||
|
|
const isStale = this.connectionIsStale(connection);
|
||
|
|
const isIdle = this.connectionIsIdle(connection);
|
||
|
|
if (!isStale && !isIdle && !connection.closed) {
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
const reason = connection.closed ? 'error' : isStale ? 'stale' : 'idle';
|
||
|
|
this.destroyConnection(connection, reason);
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
createConnection(callback) {
|
||
|
|
const connectOptions = {
|
||
|
|
...this.options,
|
||
|
|
id: this[kConnectionCounter].next().value,
|
||
|
|
generation: this[kGeneration],
|
||
|
|
cancellationToken: this[kCancellationToken]
|
||
|
|
};
|
||
|
|
this[kPending]++;
|
||
|
|
// This is our version of a "virtual" no-I/O connection as the spec requires
|
||
|
|
this.emit(ConnectionPool.CONNECTION_CREATED, new connection_pool_events_1.ConnectionCreatedEvent(this, { id: connectOptions.id }));
|
||
|
|
(0, connect_1.connect)(connectOptions, (err, connection) => {
|
||
|
|
if (err || !connection) {
|
||
|
|
this[kLogger].debug(`connection attempt failed with error [${JSON.stringify(err)}]`);
|
||
|
|
this[kPending]--;
|
||
|
|
this.emit(ConnectionPool.CONNECTION_CLOSED, new connection_pool_events_1.ConnectionClosedEvent(this, { id: connectOptions.id, serviceId: undefined }, 'error'));
|
||
|
|
if (err instanceof error_1.MongoNetworkError || err instanceof error_1.MongoServerError) {
|
||
|
|
err.connectionGeneration = connectOptions.generation;
|
||
|
|
}
|
||
|
|
callback(err !== null && err !== void 0 ? err : new error_1.MongoRuntimeError('Connection creation failed without error'));
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
// The pool might have closed since we started trying to create a connection
|
||
|
|
if (this[kPoolState] !== exports.PoolState.ready) {
|
||
|
|
this[kPending]--;
|
||
|
|
connection.destroy({ force: true });
|
||
|
|
callback(this.closed ? new errors_1.PoolClosedError(this) : new errors_1.PoolClearedError(this));
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
// forward all events from the connection to the pool
|
||
|
|
for (const event of [...constants_1.APM_EVENTS, connection_1.Connection.CLUSTER_TIME_RECEIVED]) {
|
||
|
|
connection.on(event, (e) => this.emit(event, e));
|
||
|
|
}
|
||
|
|
if (this.loadBalanced) {
|
||
|
|
connection.on(connection_1.Connection.PINNED, pinType => this[kMetrics].markPinned(pinType));
|
||
|
|
connection.on(connection_1.Connection.UNPINNED, pinType => this[kMetrics].markUnpinned(pinType));
|
||
|
|
const serviceId = connection.serviceId;
|
||
|
|
if (serviceId) {
|
||
|
|
let generation;
|
||
|
|
const sid = serviceId.toHexString();
|
||
|
|
if ((generation = this.serviceGenerations.get(sid))) {
|
||
|
|
connection.generation = generation;
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
this.serviceGenerations.set(sid, 0);
|
||
|
|
connection.generation = 0;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
connection.markAvailable();
|
||
|
|
this.emit(ConnectionPool.CONNECTION_READY, new connection_pool_events_1.ConnectionReadyEvent(this, connection));
|
||
|
|
this[kPending]--;
|
||
|
|
callback(undefined, connection);
|
||
|
|
return;
|
||
|
|
});
|
||
|
|
}
|
||
|
|
ensureMinPoolSize() {
|
||
|
|
const minPoolSize = this.options.minPoolSize;
|
||
|
|
if (this[kPoolState] !== exports.PoolState.ready || minPoolSize === 0) {
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
this[kConnections].prune(connection => this.destroyConnectionIfPerished(connection));
|
||
|
|
if (this.totalConnectionCount < minPoolSize &&
|
||
|
|
this.pendingConnectionCount < this.options.maxConnecting) {
|
||
|
|
// NOTE: ensureMinPoolSize should not try to get all the pending
|
||
|
|
// connection permits because that potentially delays the availability of
|
||
|
|
// the connection to a checkout request
|
||
|
|
this.createConnection((err, connection) => {
|
||
|
|
if (err) {
|
||
|
|
this[kServer].handleError(err);
|
||
|
|
}
|
||
|
|
if (!err && connection) {
|
||
|
|
this[kConnections].push(connection);
|
||
|
|
process.nextTick(() => this.processWaitQueue());
|
||
|
|
}
|
||
|
|
if (this[kPoolState] === exports.PoolState.ready) {
|
||
|
|
(0, timers_1.clearTimeout)(this[kMinPoolSizeTimer]);
|
||
|
|
this[kMinPoolSizeTimer] = (0, timers_1.setTimeout)(() => this.ensureMinPoolSize(), this.options.minPoolSizeCheckFrequencyMS);
|
||
|
|
}
|
||
|
|
});
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
(0, timers_1.clearTimeout)(this[kMinPoolSizeTimer]);
|
||
|
|
this[kMinPoolSizeTimer] = (0, timers_1.setTimeout)(() => this.ensureMinPoolSize(), this.options.minPoolSizeCheckFrequencyMS);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
processWaitQueue() {
|
||
|
|
if (this[kProcessingWaitQueue]) {
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
this[kProcessingWaitQueue] = true;
|
||
|
|
while (this.waitQueueSize) {
|
||
|
|
const waitQueueMember = this[kWaitQueue].first();
|
||
|
|
if (!waitQueueMember) {
|
||
|
|
this[kWaitQueue].shift();
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
if (waitQueueMember[kCancelled]) {
|
||
|
|
this[kWaitQueue].shift();
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
if (this[kPoolState] !== exports.PoolState.ready) {
|
||
|
|
const reason = this.closed ? 'poolClosed' : 'connectionError';
|
||
|
|
const error = this.closed ? new errors_1.PoolClosedError(this) : new errors_1.PoolClearedError(this);
|
||
|
|
this.emit(ConnectionPool.CONNECTION_CHECK_OUT_FAILED, new connection_pool_events_1.ConnectionCheckOutFailedEvent(this, reason));
|
||
|
|
if (waitQueueMember.timer) {
|
||
|
|
(0, timers_1.clearTimeout)(waitQueueMember.timer);
|
||
|
|
}
|
||
|
|
this[kWaitQueue].shift();
|
||
|
|
waitQueueMember.callback(error);
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
if (!this.availableConnectionCount) {
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
const connection = this[kConnections].shift();
|
||
|
|
if (!connection) {
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
if (!this.destroyConnectionIfPerished(connection)) {
|
||
|
|
this[kCheckedOut].add(connection);
|
||
|
|
this.emit(ConnectionPool.CONNECTION_CHECKED_OUT, new connection_pool_events_1.ConnectionCheckedOutEvent(this, connection));
|
||
|
|
if (waitQueueMember.timer) {
|
||
|
|
(0, timers_1.clearTimeout)(waitQueueMember.timer);
|
||
|
|
}
|
||
|
|
this[kWaitQueue].shift();
|
||
|
|
waitQueueMember.callback(undefined, connection);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
const { maxPoolSize, maxConnecting } = this.options;
|
||
|
|
while (this.waitQueueSize > 0 &&
|
||
|
|
this.pendingConnectionCount < maxConnecting &&
|
||
|
|
(maxPoolSize === 0 || this.totalConnectionCount < maxPoolSize)) {
|
||
|
|
const waitQueueMember = this[kWaitQueue].shift();
|
||
|
|
if (!waitQueueMember || waitQueueMember[kCancelled]) {
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
this.createConnection((err, connection) => {
|
||
|
|
if (waitQueueMember[kCancelled]) {
|
||
|
|
if (!err && connection) {
|
||
|
|
this[kConnections].push(connection);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
if (err) {
|
||
|
|
this.emit(ConnectionPool.CONNECTION_CHECK_OUT_FAILED, new connection_pool_events_1.ConnectionCheckOutFailedEvent(this, 'connectionError'));
|
||
|
|
}
|
||
|
|
else if (connection) {
|
||
|
|
this[kCheckedOut].add(connection);
|
||
|
|
this.emit(ConnectionPool.CONNECTION_CHECKED_OUT, new connection_pool_events_1.ConnectionCheckedOutEvent(this, connection));
|
||
|
|
}
|
||
|
|
if (waitQueueMember.timer) {
|
||
|
|
(0, timers_1.clearTimeout)(waitQueueMember.timer);
|
||
|
|
}
|
||
|
|
waitQueueMember.callback(err, connection);
|
||
|
|
}
|
||
|
|
process.nextTick(() => this.processWaitQueue());
|
||
|
|
});
|
||
|
|
}
|
||
|
|
this[kProcessingWaitQueue] = false;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
exports.ConnectionPool = ConnectionPool;
|
||
|
|
/**
|
||
|
|
* Emitted when the connection pool is created.
|
||
|
|
* @event
|
||
|
|
*/
|
||
|
|
ConnectionPool.CONNECTION_POOL_CREATED = constants_1.CONNECTION_POOL_CREATED;
|
||
|
|
/**
|
||
|
|
* Emitted once when the connection pool is closed
|
||
|
|
* @event
|
||
|
|
*/
|
||
|
|
ConnectionPool.CONNECTION_POOL_CLOSED = constants_1.CONNECTION_POOL_CLOSED;
|
||
|
|
/**
|
||
|
|
* Emitted each time the connection pool is cleared and it's generation incremented
|
||
|
|
* @event
|
||
|
|
*/
|
||
|
|
ConnectionPool.CONNECTION_POOL_CLEARED = constants_1.CONNECTION_POOL_CLEARED;
|
||
|
|
/**
|
||
|
|
* Emitted each time the connection pool is marked ready
|
||
|
|
* @event
|
||
|
|
*/
|
||
|
|
ConnectionPool.CONNECTION_POOL_READY = constants_1.CONNECTION_POOL_READY;
|
||
|
|
/**
|
||
|
|
* Emitted when a connection is created.
|
||
|
|
* @event
|
||
|
|
*/
|
||
|
|
ConnectionPool.CONNECTION_CREATED = constants_1.CONNECTION_CREATED;
|
||
|
|
/**
|
||
|
|
* Emitted when a connection becomes established, and is ready to use
|
||
|
|
* @event
|
||
|
|
*/
|
||
|
|
ConnectionPool.CONNECTION_READY = constants_1.CONNECTION_READY;
|
||
|
|
/**
|
||
|
|
* Emitted when a connection is closed
|
||
|
|
* @event
|
||
|
|
*/
|
||
|
|
ConnectionPool.CONNECTION_CLOSED = constants_1.CONNECTION_CLOSED;
|
||
|
|
/**
|
||
|
|
* Emitted when an attempt to check out a connection begins
|
||
|
|
* @event
|
||
|
|
*/
|
||
|
|
ConnectionPool.CONNECTION_CHECK_OUT_STARTED = constants_1.CONNECTION_CHECK_OUT_STARTED;
|
||
|
|
/**
|
||
|
|
* Emitted when an attempt to check out a connection fails
|
||
|
|
* @event
|
||
|
|
*/
|
||
|
|
ConnectionPool.CONNECTION_CHECK_OUT_FAILED = constants_1.CONNECTION_CHECK_OUT_FAILED;
|
||
|
|
/**
|
||
|
|
* Emitted each time a connection is successfully checked out of the connection pool
|
||
|
|
* @event
|
||
|
|
*/
|
||
|
|
ConnectionPool.CONNECTION_CHECKED_OUT = constants_1.CONNECTION_CHECKED_OUT;
|
||
|
|
/**
|
||
|
|
* Emitted each time a connection is successfully checked into the connection pool
|
||
|
|
* @event
|
||
|
|
*/
|
||
|
|
ConnectionPool.CONNECTION_CHECKED_IN = constants_1.CONNECTION_CHECKED_IN;
|
||
|
|
//# sourceMappingURL=connection_pool.js.map
|