"use strict";
|
Object.defineProperty(exports, "__esModule", { value: true });
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const events_1 = require("events");
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const ClusterAllFailedError_1 = require("../errors/ClusterAllFailedError");
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const utils_1 = require("../utils");
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const ConnectionPool_1 = require("./ConnectionPool");
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const util_1 = require("./util");
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const ClusterSubscriber_1 = require("./ClusterSubscriber");
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const DelayQueue_1 = require("./DelayQueue");
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const ScanStream_1 = require("../ScanStream");
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const redis_errors_1 = require("redis-errors");
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const standard_as_callback_1 = require("standard-as-callback");
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const PromiseContainer = require("../promiseContainer");
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const ClusterOptions_1 = require("./ClusterOptions");
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const utils_2 = require("../utils");
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const commands = require("redis-commands");
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const command_1 = require("../command");
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const redis_1 = require("../redis");
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const commander_1 = require("../commander");
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const Deque = require("denque");
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const debug = utils_1.Debug("cluster");
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/**
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* Client for the official Redis Cluster
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*
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* @class Cluster
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* @extends {EventEmitter}
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*/
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class Cluster extends events_1.EventEmitter {
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/**
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* Creates an instance of Cluster.
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*
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* @param {(Array<string | number | object>)} startupNodes
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* @param {IClusterOptions} [options={}]
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* @memberof Cluster
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*/
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constructor(startupNodes, options = {}) {
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super();
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this.slots = [];
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this.retryAttempts = 0;
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this.delayQueue = new DelayQueue_1.default();
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this.offlineQueue = new Deque();
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this.isRefreshing = false;
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/**
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* Every time Cluster#connect() is called, this value will be
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* auto-incrementing. The purpose of this value is used for
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* discarding previous connect attampts when creating a new
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* connection.
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*
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* @private
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* @type {number}
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* @memberof Cluster
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*/
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this.connectionEpoch = 0;
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commander_1.default.call(this);
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this.startupNodes = startupNodes;
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this.options = utils_1.defaults({}, options, ClusterOptions_1.DEFAULT_CLUSTER_OPTIONS, this.options);
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// validate options
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if (typeof this.options.scaleReads !== "function" &&
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["all", "master", "slave"].indexOf(this.options.scaleReads) === -1) {
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throw new Error('Invalid option scaleReads "' +
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this.options.scaleReads +
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'". Expected "all", "master", "slave" or a custom function');
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}
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this.connectionPool = new ConnectionPool_1.default(this.options.redisOptions);
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this.connectionPool.on("-node", (redis, key) => {
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this.emit("-node", redis);
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});
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this.connectionPool.on("+node", redis => {
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this.emit("+node", redis);
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});
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this.connectionPool.on("drain", () => {
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this.setStatus("close");
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});
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this.connectionPool.on("nodeError", (error, key) => {
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this.emit("node error", error, key);
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});
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this.subscriber = new ClusterSubscriber_1.default(this.connectionPool, this);
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if (this.options.lazyConnect) {
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this.setStatus("wait");
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}
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else {
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this.connect().catch(err => {
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debug("connecting failed: %s", err);
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});
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}
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}
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resetOfflineQueue() {
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this.offlineQueue = new Deque();
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}
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clearNodesRefreshInterval() {
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if (this.slotsTimer) {
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clearTimeout(this.slotsTimer);
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this.slotsTimer = null;
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}
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}
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resetNodesRefreshInterval() {
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if (this.slotsTimer) {
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return;
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}
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const nextRound = () => {
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this.slotsTimer = setTimeout(() => {
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debug('refreshing slot caches... (triggered by "slotsRefreshInterval" option)');
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this.refreshSlotsCache(() => {
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nextRound();
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});
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}, this.options.slotsRefreshInterval);
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};
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nextRound();
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}
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/**
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* Connect to a cluster
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*
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* @returns {Promise<void>}
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* @memberof Cluster
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*/
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connect() {
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const Promise = PromiseContainer.get();
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return new Promise((resolve, reject) => {
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if (this.status === "connecting" ||
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this.status === "connect" ||
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this.status === "ready") {
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reject(new Error("Redis is already connecting/connected"));
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return;
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}
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const epoch = ++this.connectionEpoch;
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this.setStatus("connecting");
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this.resolveStartupNodeHostnames()
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.then(nodes => {
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if (this.connectionEpoch !== epoch) {
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debug("discard connecting after resolving startup nodes because epoch not match: %d != %d", epoch, this.connectionEpoch);
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reject(new redis_errors_1.RedisError("Connection is discarded because a new connection is made"));
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return;
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}
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if (this.status !== "connecting") {
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debug("discard connecting after resolving startup nodes because the status changed to %s", this.status);
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reject(new redis_errors_1.RedisError("Connection is aborted"));
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return;
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}
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this.connectionPool.reset(nodes);
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function readyHandler() {
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this.setStatus("ready");
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this.retryAttempts = 0;
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this.executeOfflineCommands();
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this.resetNodesRefreshInterval();
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resolve();
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}
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let closeListener;
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const refreshListener = () => {
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this.removeListener("close", closeListener);
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this.manuallyClosing = false;
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this.setStatus("connect");
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if (this.options.enableReadyCheck) {
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this.readyCheck((err, fail) => {
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if (err || fail) {
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debug("Ready check failed (%s). Reconnecting...", err || fail);
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if (this.status === "connect") {
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this.disconnect(true);
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}
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}
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else {
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readyHandler.call(this);
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}
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});
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}
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else {
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readyHandler.call(this);
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}
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};
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closeListener = function () {
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this.removeListener("refresh", refreshListener);
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reject(new Error("None of startup nodes is available"));
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};
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this.once("refresh", refreshListener);
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this.once("close", closeListener);
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this.once("close", this.handleCloseEvent.bind(this));
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this.refreshSlotsCache(function (err) {
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if (err && err.message === "Failed to refresh slots cache.") {
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redis_1.default.prototype.silentEmit.call(this, "error", err);
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this.connectionPool.reset([]);
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}
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}.bind(this));
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this.subscriber.start();
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})
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.catch(err => {
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this.setStatus("close");
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this.handleCloseEvent(err);
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reject(err);
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});
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});
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}
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/**
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* Called when closed to check whether a reconnection should be made
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*
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* @private
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* @memberof Cluster
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*/
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handleCloseEvent(reason) {
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if (reason) {
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debug("closed because %s", reason);
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}
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let retryDelay;
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if (!this.manuallyClosing &&
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typeof this.options.clusterRetryStrategy === "function") {
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retryDelay = this.options.clusterRetryStrategy.call(this, ++this.retryAttempts, reason);
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}
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if (typeof retryDelay === "number") {
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this.setStatus("reconnecting");
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this.reconnectTimeout = setTimeout(function () {
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this.reconnectTimeout = null;
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debug("Cluster is disconnected. Retrying after %dms", retryDelay);
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this.connect().catch(function (err) {
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debug("Got error %s when reconnecting. Ignoring...", err);
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});
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}.bind(this), retryDelay);
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}
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else {
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this.setStatus("end");
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this.flushQueue(new Error("None of startup nodes is available"));
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}
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}
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/**
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* Disconnect from every node in the cluster.
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*
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* @param {boolean} [reconnect=false]
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* @memberof Cluster
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*/
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disconnect(reconnect = false) {
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const status = this.status;
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this.setStatus("disconnecting");
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if (!reconnect) {
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this.manuallyClosing = true;
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}
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if (this.reconnectTimeout) {
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clearTimeout(this.reconnectTimeout);
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this.reconnectTimeout = null;
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debug("Canceled reconnecting attempts");
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}
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this.clearNodesRefreshInterval();
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this.subscriber.stop();
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if (status === "wait") {
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this.setStatus("close");
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this.handleCloseEvent();
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}
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else {
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this.connectionPool.reset([]);
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}
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}
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/**
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* Quit the cluster gracefully.
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*
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* @param {CallbackFunction<'OK'>} [callback]
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* @returns {Promise<'OK'>}
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* @memberof Cluster
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*/
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quit(callback) {
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const status = this.status;
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this.setStatus("disconnecting");
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this.manuallyClosing = true;
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if (this.reconnectTimeout) {
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clearTimeout(this.reconnectTimeout);
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this.reconnectTimeout = null;
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}
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this.clearNodesRefreshInterval();
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this.subscriber.stop();
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const Promise = PromiseContainer.get();
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if (status === "wait") {
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const ret = standard_as_callback_1.default(Promise.resolve("OK"), callback);
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// use setImmediate to make sure "close" event
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// being emitted after quit() is returned
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setImmediate(function () {
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this.setStatus("close");
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this.handleCloseEvent();
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}.bind(this));
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return ret;
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}
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return standard_as_callback_1.default(Promise.all(this.nodes().map(node => node.quit().catch(err => {
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// Ignore the error caused by disconnecting since
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// we're disconnecting...
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if (err.message === utils_2.CONNECTION_CLOSED_ERROR_MSG) {
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return "OK";
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}
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throw err;
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}))).then(() => "OK"), callback);
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}
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/**
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* Create a new instance with the same startup nodes and options as the current one.
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*
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* @example
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* ```js
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* var cluster = new Redis.Cluster([{ host: "127.0.0.1", port: "30001" }]);
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* var anotherCluster = cluster.duplicate();
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* ```
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*
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* @public
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* @param {(Array<string | number | object>)} [overrideStartupNodes=[]]
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* @param {IClusterOptions} [overrideOptions={}]
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* @memberof Cluster
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*/
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duplicate(overrideStartupNodes = [], overrideOptions = {}) {
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const startupNodes = overrideStartupNodes.length > 0
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? overrideStartupNodes
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: this.startupNodes.slice(0);
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const options = Object.assign({}, this.options, overrideOptions);
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return new Cluster(startupNodes, options);
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}
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/**
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* Get nodes with the specified role
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*
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* @param {NodeRole} [role='all']
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* @returns {any[]}
|
* @memberof Cluster
|
*/
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nodes(role = "all") {
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if (role !== "all" && role !== "master" && role !== "slave") {
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throw new Error('Invalid role "' + role + '". Expected "all", "master" or "slave"');
|
}
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return this.connectionPool.getNodes(role);
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}
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/**
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* Change cluster instance's status
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*
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* @private
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* @param {ClusterStatus} status
|
* @memberof Cluster
|
*/
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setStatus(status) {
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debug("status: %s -> %s", this.status || "[empty]", status);
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this.status = status;
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process.nextTick(() => {
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this.emit(status);
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});
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}
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/**
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* Refresh the slot cache
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*
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* @private
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* @param {CallbackFunction} [callback]
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* @memberof Cluster
|
*/
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refreshSlotsCache(callback) {
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if (this.isRefreshing) {
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if (typeof callback === "function") {
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process.nextTick(callback);
|
}
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return;
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}
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this.isRefreshing = true;
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const _this = this;
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const wrapper = function (error) {
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_this.isRefreshing = false;
|
if (typeof callback === "function") {
|
callback(error);
|
}
|
};
|
const nodes = utils_2.shuffle(this.connectionPool.getNodes());
|
let lastNodeError = null;
|
function tryNode(index) {
|
if (index === nodes.length) {
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const error = new ClusterAllFailedError_1.default("Failed to refresh slots cache.", lastNodeError);
|
return wrapper(error);
|
}
|
const node = nodes[index];
|
const key = `${node.options.host}:${node.options.port}`;
|
debug("getting slot cache from %s", key);
|
_this.getInfoFromNode(node, function (err) {
|
switch (_this.status) {
|
case "close":
|
case "end":
|
return wrapper(new Error("Cluster is disconnected."));
|
case "disconnecting":
|
return wrapper(new Error("Cluster is disconnecting."));
|
}
|
if (err) {
|
_this.emit("node error", err, key);
|
lastNodeError = err;
|
tryNode(index + 1);
|
}
|
else {
|
_this.emit("refresh");
|
wrapper();
|
}
|
});
|
}
|
tryNode(0);
|
}
|
/**
|
* Flush offline queue with error.
|
*
|
* @param {Error} error
|
* @memberof Cluster
|
*/
|
flushQueue(error) {
|
let item;
|
while (this.offlineQueue.length > 0) {
|
item = this.offlineQueue.shift();
|
item.command.reject(error);
|
}
|
}
|
executeOfflineCommands() {
|
if (this.offlineQueue.length) {
|
debug("send %d commands in offline queue", this.offlineQueue.length);
|
const offlineQueue = this.offlineQueue;
|
this.resetOfflineQueue();
|
while (offlineQueue.length > 0) {
|
const item = offlineQueue.shift();
|
this.sendCommand(item.command, item.stream, item.node);
|
}
|
}
|
}
|
natMapper(nodeKey) {
|
if (this.options.natMap && typeof this.options.natMap === "object") {
|
const key = typeof nodeKey === "string"
|
? nodeKey
|
: `${nodeKey.host}:${nodeKey.port}`;
|
const mapped = this.options.natMap[key];
|
if (mapped) {
|
debug("NAT mapping %s -> %O", key, mapped);
|
return Object.assign({}, mapped);
|
}
|
}
|
return typeof nodeKey === "string"
|
? util_1.nodeKeyToRedisOptions(nodeKey)
|
: nodeKey;
|
}
|
sendCommand(command, stream, node) {
|
if (this.status === "wait") {
|
this.connect().catch(utils_1.noop);
|
}
|
if (this.status === "end") {
|
command.reject(new Error(utils_2.CONNECTION_CLOSED_ERROR_MSG));
|
return command.promise;
|
}
|
let to = this.options.scaleReads;
|
if (to !== "master") {
|
const isCommandReadOnly = commands.exists(command.name) &&
|
commands.hasFlag(command.name, "readonly");
|
if (!isCommandReadOnly) {
|
to = "master";
|
}
|
}
|
let targetSlot = node ? node.slot : command.getSlot();
|
const ttl = {};
|
const _this = this;
|
if (!node && !command.__is_reject_overwritten) {
|
// eslint-disable-next-line @typescript-eslint/camelcase
|
command.__is_reject_overwritten = true;
|
const reject = command.reject;
|
command.reject = function (err) {
|
const partialTry = tryConnection.bind(null, true);
|
_this.handleError(err, ttl, {
|
moved: function (slot, key) {
|
debug("command %s is moved to %s", command.name, key);
|
targetSlot = Number(slot);
|
if (_this.slots[slot]) {
|
_this.slots[slot][0] = key;
|
}
|
else {
|
_this.slots[slot] = [key];
|
}
|
_this.connectionPool.findOrCreate(_this.natMapper(key));
|
tryConnection();
|
debug("refreshing slot caches... (triggered by MOVED error)");
|
_this.refreshSlotsCache();
|
},
|
ask: function (slot, key) {
|
debug("command %s is required to ask %s:%s", command.name, key);
|
const mapped = _this.natMapper(key);
|
_this.connectionPool.findOrCreate(mapped);
|
tryConnection(false, `${mapped.host}:${mapped.port}`);
|
},
|
tryagain: partialTry,
|
clusterDown: partialTry,
|
connectionClosed: partialTry,
|
maxRedirections: function (redirectionError) {
|
reject.call(command, redirectionError);
|
},
|
defaults: function () {
|
reject.call(command, err);
|
}
|
});
|
};
|
}
|
tryConnection();
|
function tryConnection(random, asking) {
|
if (_this.status === "end") {
|
command.reject(new redis_errors_1.AbortError("Cluster is ended."));
|
return;
|
}
|
let redis;
|
if (_this.status === "ready" || command.name === "cluster") {
|
if (node && node.redis) {
|
redis = node.redis;
|
}
|
else if (command_1.default.checkFlag("ENTER_SUBSCRIBER_MODE", command.name) ||
|
command_1.default.checkFlag("EXIT_SUBSCRIBER_MODE", command.name)) {
|
redis = _this.subscriber.getInstance();
|
if (!redis) {
|
command.reject(new redis_errors_1.AbortError("No subscriber for the cluster"));
|
return;
|
}
|
}
|
else {
|
if (!random) {
|
if (typeof targetSlot === "number" && _this.slots[targetSlot]) {
|
const nodeKeys = _this.slots[targetSlot];
|
if (typeof to === "function") {
|
const nodes = nodeKeys.map(function (key) {
|
return _this.connectionPool.getInstanceByKey(key);
|
});
|
redis = to(nodes, command);
|
if (Array.isArray(redis)) {
|
redis = utils_2.sample(redis);
|
}
|
if (!redis) {
|
redis = nodes[0];
|
}
|
}
|
else {
|
let key;
|
if (to === "all") {
|
key = utils_2.sample(nodeKeys);
|
}
|
else if (to === "slave" && nodeKeys.length > 1) {
|
key = utils_2.sample(nodeKeys, 1);
|
}
|
else {
|
key = nodeKeys[0];
|
}
|
redis = _this.connectionPool.getInstanceByKey(key);
|
}
|
}
|
if (asking) {
|
redis = _this.connectionPool.getInstanceByKey(asking);
|
redis.asking();
|
}
|
}
|
if (!redis) {
|
redis =
|
(typeof to === "function"
|
? null
|
: _this.connectionPool.getSampleInstance(to)) ||
|
_this.connectionPool.getSampleInstance("all");
|
}
|
}
|
if (node && !node.redis) {
|
node.redis = redis;
|
}
|
}
|
if (redis) {
|
redis.sendCommand(command, stream);
|
}
|
else if (_this.options.enableOfflineQueue) {
|
_this.offlineQueue.push({
|
command: command,
|
stream: stream,
|
node: node
|
});
|
}
|
else {
|
command.reject(new Error("Cluster isn't ready and enableOfflineQueue options is false"));
|
}
|
}
|
return command.promise;
|
}
|
handleError(error, ttl, handlers) {
|
if (typeof ttl.value === "undefined") {
|
ttl.value = this.options.maxRedirections;
|
}
|
else {
|
ttl.value -= 1;
|
}
|
if (ttl.value <= 0) {
|
handlers.maxRedirections(new Error("Too many Cluster redirections. Last error: " + error));
|
return;
|
}
|
const errv = error.message.split(" ");
|
if (errv[0] === "MOVED" || errv[0] === "ASK") {
|
handlers[errv[0] === "MOVED" ? "moved" : "ask"](errv[1], errv[2]);
|
}
|
else if (errv[0] === "TRYAGAIN") {
|
this.delayQueue.push("tryagain", handlers.tryagain, {
|
timeout: this.options.retryDelayOnTryAgain
|
});
|
}
|
else if (errv[0] === "CLUSTERDOWN" &&
|
this.options.retryDelayOnClusterDown > 0) {
|
this.delayQueue.push("clusterdown", handlers.connectionClosed, {
|
timeout: this.options.retryDelayOnClusterDown,
|
callback: this.refreshSlotsCache.bind(this)
|
});
|
}
|
else if (error.message === utils_2.CONNECTION_CLOSED_ERROR_MSG &&
|
this.options.retryDelayOnFailover > 0 &&
|
this.status === "ready") {
|
this.delayQueue.push("failover", handlers.connectionClosed, {
|
timeout: this.options.retryDelayOnFailover,
|
callback: this.refreshSlotsCache.bind(this)
|
});
|
}
|
else {
|
handlers.defaults();
|
}
|
}
|
getInfoFromNode(redis, callback) {
|
if (!redis) {
|
return callback(new Error("Node is disconnected"));
|
}
|
// Use a duplication of the connection to avoid
|
// timeouts when the connection is in the blocking
|
// mode (e.g. waiting for BLPOP).
|
const duplicatedConnection = redis.duplicate({
|
enableOfflineQueue: true,
|
enableReadyCheck: false,
|
retryStrategy: null,
|
connectionName: "ioredisClusterRefresher"
|
});
|
// Ignore error events since we will handle
|
// exceptions for the CLUSTER SLOTS command.
|
duplicatedConnection.on("error", utils_1.noop);
|
duplicatedConnection.cluster("slots", utils_2.timeout((err, result) => {
|
duplicatedConnection.disconnect();
|
if (err) {
|
return callback(err);
|
}
|
if (this.status === "disconnecting" ||
|
this.status === "close" ||
|
this.status === "end") {
|
debug("ignore CLUSTER.SLOTS results (count: %d) since cluster status is %s", result.length, this.status);
|
callback();
|
return;
|
}
|
const nodes = [];
|
debug("cluster slots result count: %d", result.length);
|
for (let i = 0; i < result.length; ++i) {
|
const items = result[i];
|
const slotRangeStart = items[0];
|
const slotRangeEnd = items[1];
|
const keys = [];
|
for (let j = 2; j < items.length; j++) {
|
items[j] = this.natMapper({ host: items[j][0], port: items[j][1] });
|
items[j].readOnly = j !== 2;
|
nodes.push(items[j]);
|
keys.push(items[j].host + ":" + items[j].port);
|
}
|
debug("cluster slots result [%d]: slots %d~%d served by %s", i, slotRangeStart, slotRangeEnd, keys);
|
for (let slot = slotRangeStart; slot <= slotRangeEnd; slot++) {
|
this.slots[slot] = keys;
|
}
|
}
|
this.connectionPool.reset(nodes);
|
callback();
|
}, this.options.slotsRefreshTimeout));
|
}
|
/**
|
* Check whether Cluster is able to process commands
|
*
|
* @param {Function} callback
|
* @private
|
*/
|
readyCheck(callback) {
|
this.cluster("info", function (err, res) {
|
if (err) {
|
return callback(err);
|
}
|
if (typeof res !== "string") {
|
return callback();
|
}
|
let state;
|
const lines = res.split("\r\n");
|
for (let i = 0; i < lines.length; ++i) {
|
const parts = lines[i].split(":");
|
if (parts[0] === "cluster_state") {
|
state = parts[1];
|
break;
|
}
|
}
|
if (state === "fail") {
|
debug("cluster state not ok (%s)", state);
|
callback(null, state);
|
}
|
else {
|
callback();
|
}
|
});
|
}
|
dnsLookup(hostname) {
|
return new Promise((resolve, reject) => {
|
this.options.dnsLookup(hostname, (err, address) => {
|
if (err) {
|
debug("failed to resolve hostname %s to IP: %s", hostname, err.message);
|
reject(err);
|
}
|
else {
|
debug("resolved hostname %s to IP %s", hostname, address);
|
resolve(address);
|
}
|
});
|
});
|
}
|
/**
|
* Normalize startup nodes, and resolving hostnames to IPs.
|
*
|
* This process happens every time when #connect() is called since
|
* #startupNodes and DNS records may chanage.
|
*
|
* @private
|
* @returns {Promise<IRedisOptions[]>}
|
*/
|
resolveStartupNodeHostnames() {
|
if (!Array.isArray(this.startupNodes) || this.startupNodes.length === 0) {
|
return Promise.reject(new Error("`startupNodes` should contain at least one node."));
|
}
|
const startupNodes = util_1.normalizeNodeOptions(this.startupNodes);
|
const hostnames = util_1.getUniqueHostnamesFromOptions(startupNodes);
|
if (hostnames.length === 0) {
|
return Promise.resolve(startupNodes);
|
}
|
return Promise.all(hostnames.map(hostname => this.dnsLookup(hostname))).then(ips => {
|
const hostnameToIP = utils_2.zipMap(hostnames, ips);
|
return startupNodes.map(node => hostnameToIP.has(node.host)
|
? Object.assign({}, node, { host: hostnameToIP.get(node.host) })
|
: node);
|
});
|
}
|
}
|
Object.getOwnPropertyNames(commander_1.default.prototype).forEach(name => {
|
if (!Cluster.prototype.hasOwnProperty(name)) {
|
Cluster.prototype[name] = commander_1.default.prototype[name];
|
}
|
});
|
const scanCommands = [
|
"sscan",
|
"hscan",
|
"zscan",
|
"sscanBuffer",
|
"hscanBuffer",
|
"zscanBuffer"
|
];
|
scanCommands.forEach(command => {
|
Cluster.prototype[command + "Stream"] = function (key, options) {
|
return new ScanStream_1.default(utils_1.defaults({
|
objectMode: true,
|
key: key,
|
redis: this,
|
command: command
|
}, options));
|
};
|
});
|
require("../transaction").addTransactionSupport(Cluster.prototype);
|
exports.default = Cluster;
|
