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Aravind142857
417
node_modules/mongodb/lib/sdam/monitor.js
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vendored
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417
node_modules/mongodb/lib/sdam/monitor.js
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vendored
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@@ -0,0 +1,417 @@
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"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.MonitorInterval = exports.RTTPinger = exports.Monitor = void 0;
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const timers_1 = require("timers");
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const bson_1 = require("../bson");
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const connect_1 = require("../cmap/connect");
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const connection_1 = require("../cmap/connection");
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const constants_1 = require("../constants");
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const error_1 = require("../error");
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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 common_1 = require("./common");
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const events_1 = require("./events");
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const server_1 = require("./server");
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/** @internal */
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const kServer = Symbol('server');
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/** @internal */
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const kMonitorId = Symbol('monitorId');
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/** @internal */
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const kConnection = Symbol('connection');
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/** @internal */
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const kCancellationToken = Symbol('cancellationToken');
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/** @internal */
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const kRTTPinger = Symbol('rttPinger');
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/** @internal */
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const kRoundTripTime = Symbol('roundTripTime');
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const STATE_IDLE = 'idle';
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const STATE_MONITORING = 'monitoring';
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const stateTransition = (0, utils_1.makeStateMachine)({
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[common_1.STATE_CLOSING]: [common_1.STATE_CLOSING, STATE_IDLE, common_1.STATE_CLOSED],
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[common_1.STATE_CLOSED]: [common_1.STATE_CLOSED, STATE_MONITORING],
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[STATE_IDLE]: [STATE_IDLE, STATE_MONITORING, common_1.STATE_CLOSING],
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[STATE_MONITORING]: [STATE_MONITORING, STATE_IDLE, common_1.STATE_CLOSING]
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});
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const INVALID_REQUEST_CHECK_STATES = new Set([common_1.STATE_CLOSING, common_1.STATE_CLOSED, STATE_MONITORING]);
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function isInCloseState(monitor) {
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return monitor.s.state === common_1.STATE_CLOSED || monitor.s.state === common_1.STATE_CLOSING;
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}
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/** @internal */
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class Monitor extends mongo_types_1.TypedEventEmitter {
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get connection() {
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return this[kConnection];
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}
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constructor(server, options) {
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super();
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this[kServer] = server;
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this[kConnection] = undefined;
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this[kCancellationToken] = new mongo_types_1.CancellationToken();
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this[kCancellationToken].setMaxListeners(Infinity);
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this[kMonitorId] = undefined;
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this.s = {
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state: common_1.STATE_CLOSED
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};
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this.address = server.description.address;
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this.options = Object.freeze({
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connectTimeoutMS: options.connectTimeoutMS ?? 10000,
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heartbeatFrequencyMS: options.heartbeatFrequencyMS ?? 10000,
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minHeartbeatFrequencyMS: options.minHeartbeatFrequencyMS ?? 500
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});
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const cancellationToken = this[kCancellationToken];
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// TODO: refactor this to pull it directly from the pool, requires new ConnectionPool integration
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const connectOptions = Object.assign({
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id: '<monitor>',
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generation: server.pool.generation,
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connectionType: connection_1.Connection,
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cancellationToken,
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hostAddress: server.description.hostAddress
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}, options,
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// force BSON serialization options
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{
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raw: false,
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useBigInt64: false,
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promoteLongs: true,
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promoteValues: true,
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promoteBuffers: true
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});
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// ensure no authentication is used for monitoring
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delete connectOptions.credentials;
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if (connectOptions.autoEncrypter) {
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delete connectOptions.autoEncrypter;
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}
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this.connectOptions = Object.freeze(connectOptions);
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}
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connect() {
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if (this.s.state !== common_1.STATE_CLOSED) {
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return;
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}
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// start
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const heartbeatFrequencyMS = this.options.heartbeatFrequencyMS;
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const minHeartbeatFrequencyMS = this.options.minHeartbeatFrequencyMS;
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this[kMonitorId] = new MonitorInterval(monitorServer(this), {
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heartbeatFrequencyMS: heartbeatFrequencyMS,
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minHeartbeatFrequencyMS: minHeartbeatFrequencyMS,
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immediate: true
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});
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}
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requestCheck() {
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if (INVALID_REQUEST_CHECK_STATES.has(this.s.state)) {
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return;
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}
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this[kMonitorId]?.wake();
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}
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reset() {
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const topologyVersion = this[kServer].description.topologyVersion;
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if (isInCloseState(this) || topologyVersion == null) {
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return;
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}
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stateTransition(this, common_1.STATE_CLOSING);
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resetMonitorState(this);
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// restart monitor
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stateTransition(this, STATE_IDLE);
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// restart monitoring
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const heartbeatFrequencyMS = this.options.heartbeatFrequencyMS;
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const minHeartbeatFrequencyMS = this.options.minHeartbeatFrequencyMS;
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this[kMonitorId] = new MonitorInterval(monitorServer(this), {
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heartbeatFrequencyMS: heartbeatFrequencyMS,
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minHeartbeatFrequencyMS: minHeartbeatFrequencyMS
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});
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}
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close() {
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if (isInCloseState(this)) {
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return;
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}
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stateTransition(this, common_1.STATE_CLOSING);
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resetMonitorState(this);
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// close monitor
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this.emit('close');
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stateTransition(this, common_1.STATE_CLOSED);
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}
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}
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exports.Monitor = Monitor;
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function resetMonitorState(monitor) {
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monitor[kMonitorId]?.stop();
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monitor[kMonitorId] = undefined;
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monitor[kRTTPinger]?.close();
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monitor[kRTTPinger] = undefined;
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monitor[kCancellationToken].emit('cancel');
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monitor[kConnection]?.destroy({ force: true });
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monitor[kConnection] = undefined;
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}
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function checkServer(monitor, callback) {
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let start = (0, utils_1.now)();
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monitor.emit(server_1.Server.SERVER_HEARTBEAT_STARTED, new events_1.ServerHeartbeatStartedEvent(monitor.address));
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function failureHandler(err) {
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monitor[kConnection]?.destroy({ force: true });
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monitor[kConnection] = undefined;
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monitor.emit(server_1.Server.SERVER_HEARTBEAT_FAILED, new events_1.ServerHeartbeatFailedEvent(monitor.address, (0, utils_1.calculateDurationInMs)(start), err));
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const error = !(err instanceof error_1.MongoError) ? new error_1.MongoError(err) : err;
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error.addErrorLabel(error_1.MongoErrorLabel.ResetPool);
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if (error instanceof error_1.MongoNetworkTimeoutError) {
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error.addErrorLabel(error_1.MongoErrorLabel.InterruptInUseConnections);
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}
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monitor.emit('resetServer', error);
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callback(err);
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}
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const connection = monitor[kConnection];
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if (connection && !connection.closed) {
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const { serverApi, helloOk } = connection;
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const connectTimeoutMS = monitor.options.connectTimeoutMS;
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const maxAwaitTimeMS = monitor.options.heartbeatFrequencyMS;
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const topologyVersion = monitor[kServer].description.topologyVersion;
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const isAwaitable = topologyVersion != null;
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const cmd = {
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[serverApi?.version || helloOk ? 'hello' : constants_1.LEGACY_HELLO_COMMAND]: 1,
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...(isAwaitable && topologyVersion
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? { maxAwaitTimeMS, topologyVersion: makeTopologyVersion(topologyVersion) }
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: {})
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};
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const options = isAwaitable
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? {
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socketTimeoutMS: connectTimeoutMS ? connectTimeoutMS + maxAwaitTimeMS : 0,
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exhaustAllowed: true
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}
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: { socketTimeoutMS: connectTimeoutMS };
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if (isAwaitable && monitor[kRTTPinger] == null) {
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monitor[kRTTPinger] = new RTTPinger(monitor[kCancellationToken], Object.assign({ heartbeatFrequencyMS: monitor.options.heartbeatFrequencyMS }, monitor.connectOptions));
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}
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connection.command((0, utils_1.ns)('admin.$cmd'), cmd, options, (err, hello) => {
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if (err) {
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return failureHandler(err);
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}
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if (!('isWritablePrimary' in hello)) {
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// Provide hello-style response document.
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hello.isWritablePrimary = hello[constants_1.LEGACY_HELLO_COMMAND];
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}
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const rttPinger = monitor[kRTTPinger];
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const duration = isAwaitable && rttPinger ? rttPinger.roundTripTime : (0, utils_1.calculateDurationInMs)(start);
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monitor.emit(server_1.Server.SERVER_HEARTBEAT_SUCCEEDED, new events_1.ServerHeartbeatSucceededEvent(monitor.address, duration, hello));
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// if we are using the streaming protocol then we immediately issue another `started`
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// event, otherwise the "check" is complete and return to the main monitor loop
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if (isAwaitable && hello.topologyVersion) {
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monitor.emit(server_1.Server.SERVER_HEARTBEAT_STARTED, new events_1.ServerHeartbeatStartedEvent(monitor.address));
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start = (0, utils_1.now)();
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}
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else {
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monitor[kRTTPinger]?.close();
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monitor[kRTTPinger] = undefined;
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callback(undefined, hello);
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}
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});
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return;
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}
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// connecting does an implicit `hello`
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(0, connect_1.connect)(monitor.connectOptions, (err, conn) => {
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if (err) {
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monitor[kConnection] = undefined;
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failureHandler(err);
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return;
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}
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if (conn) {
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// Tell the connection that we are using the streaming protocol so that the
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// connection's message stream will only read the last hello on the buffer.
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conn.isMonitoringConnection = true;
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if (isInCloseState(monitor)) {
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conn.destroy({ force: true });
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return;
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}
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monitor[kConnection] = conn;
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monitor.emit(server_1.Server.SERVER_HEARTBEAT_SUCCEEDED, new events_1.ServerHeartbeatSucceededEvent(monitor.address, (0, utils_1.calculateDurationInMs)(start), conn.hello));
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callback(undefined, conn.hello);
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}
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});
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}
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function monitorServer(monitor) {
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return (callback) => {
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if (monitor.s.state === STATE_MONITORING) {
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process.nextTick(callback);
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return;
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}
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stateTransition(monitor, STATE_MONITORING);
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function done() {
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if (!isInCloseState(monitor)) {
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stateTransition(monitor, STATE_IDLE);
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}
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callback();
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}
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checkServer(monitor, (err, hello) => {
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if (err) {
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// otherwise an error occurred on initial discovery, also bail
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if (monitor[kServer].description.type === common_1.ServerType.Unknown) {
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return done();
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}
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}
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// if the check indicates streaming is supported, immediately reschedule monitoring
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if (hello && hello.topologyVersion) {
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(0, timers_1.setTimeout)(() => {
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if (!isInCloseState(monitor)) {
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monitor[kMonitorId]?.wake();
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}
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}, 0);
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}
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done();
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});
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};
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}
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function makeTopologyVersion(tv) {
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return {
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processId: tv.processId,
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// tests mock counter as just number, but in a real situation counter should always be a Long
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// TODO(NODE-2674): Preserve int64 sent from MongoDB
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counter: bson_1.Long.isLong(tv.counter) ? tv.counter : bson_1.Long.fromNumber(tv.counter)
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};
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}
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/** @internal */
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class RTTPinger {
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constructor(cancellationToken, options) {
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this[kConnection] = undefined;
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this[kCancellationToken] = cancellationToken;
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this[kRoundTripTime] = 0;
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this.closed = false;
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const heartbeatFrequencyMS = options.heartbeatFrequencyMS;
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this[kMonitorId] = (0, timers_1.setTimeout)(() => measureRoundTripTime(this, options), heartbeatFrequencyMS);
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}
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get roundTripTime() {
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return this[kRoundTripTime];
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}
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close() {
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this.closed = true;
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(0, timers_1.clearTimeout)(this[kMonitorId]);
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this[kConnection]?.destroy({ force: true });
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this[kConnection] = undefined;
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}
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}
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exports.RTTPinger = RTTPinger;
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function measureRoundTripTime(rttPinger, options) {
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const start = (0, utils_1.now)();
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options.cancellationToken = rttPinger[kCancellationToken];
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const heartbeatFrequencyMS = options.heartbeatFrequencyMS;
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if (rttPinger.closed) {
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return;
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}
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function measureAndReschedule(conn) {
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if (rttPinger.closed) {
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conn?.destroy({ force: true });
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return;
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}
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if (rttPinger[kConnection] == null) {
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rttPinger[kConnection] = conn;
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}
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rttPinger[kRoundTripTime] = (0, utils_1.calculateDurationInMs)(start);
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rttPinger[kMonitorId] = (0, timers_1.setTimeout)(() => measureRoundTripTime(rttPinger, options), heartbeatFrequencyMS);
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}
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const connection = rttPinger[kConnection];
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if (connection == null) {
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(0, connect_1.connect)(options, (err, conn) => {
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if (err) {
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rttPinger[kConnection] = undefined;
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rttPinger[kRoundTripTime] = 0;
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return;
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}
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measureAndReschedule(conn);
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});
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return;
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}
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connection.command((0, utils_1.ns)('admin.$cmd'), { [constants_1.LEGACY_HELLO_COMMAND]: 1 }, undefined, err => {
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if (err) {
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rttPinger[kConnection] = undefined;
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rttPinger[kRoundTripTime] = 0;
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return;
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}
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measureAndReschedule();
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});
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}
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/**
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* @internal
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*/
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class MonitorInterval {
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constructor(fn, options = {}) {
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this.isExpeditedCallToFnScheduled = false;
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this.stopped = false;
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this.isExecutionInProgress = false;
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this.hasExecutedOnce = false;
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this._executeAndReschedule = () => {
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if (this.stopped)
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return;
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if (this.timerId) {
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(0, timers_1.clearTimeout)(this.timerId);
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}
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this.isExpeditedCallToFnScheduled = false;
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this.isExecutionInProgress = true;
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this.fn(() => {
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this.lastExecutionEnded = (0, utils_1.now)();
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this.isExecutionInProgress = false;
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this._reschedule(this.heartbeatFrequencyMS);
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});
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};
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this.fn = fn;
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this.lastExecutionEnded = -Infinity;
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this.heartbeatFrequencyMS = options.heartbeatFrequencyMS ?? 1000;
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this.minHeartbeatFrequencyMS = options.minHeartbeatFrequencyMS ?? 500;
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if (options.immediate) {
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this._executeAndReschedule();
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}
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else {
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this._reschedule(undefined);
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}
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}
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wake() {
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const currentTime = (0, utils_1.now)();
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const timeSinceLastCall = currentTime - this.lastExecutionEnded;
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// TODO(NODE-4674): Add error handling and logging to the monitor
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if (timeSinceLastCall < 0) {
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return this._executeAndReschedule();
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}
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if (this.isExecutionInProgress) {
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return;
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}
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// debounce multiple calls to wake within the `minInterval`
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if (this.isExpeditedCallToFnScheduled) {
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return;
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}
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// reschedule a call as soon as possible, ensuring the call never happens
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// faster than the `minInterval`
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if (timeSinceLastCall < this.minHeartbeatFrequencyMS) {
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this.isExpeditedCallToFnScheduled = true;
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this._reschedule(this.minHeartbeatFrequencyMS - timeSinceLastCall);
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return;
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}
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this._executeAndReschedule();
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}
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stop() {
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this.stopped = true;
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if (this.timerId) {
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(0, timers_1.clearTimeout)(this.timerId);
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this.timerId = undefined;
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}
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this.lastExecutionEnded = -Infinity;
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this.isExpeditedCallToFnScheduled = false;
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}
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toString() {
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return JSON.stringify(this);
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}
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toJSON() {
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const currentTime = (0, utils_1.now)();
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const timeSinceLastCall = currentTime - this.lastExecutionEnded;
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return {
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timerId: this.timerId != null ? 'set' : 'cleared',
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lastCallTime: this.lastExecutionEnded,
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isExpeditedCheckScheduled: this.isExpeditedCallToFnScheduled,
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stopped: this.stopped,
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heartbeatFrequencyMS: this.heartbeatFrequencyMS,
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minHeartbeatFrequencyMS: this.minHeartbeatFrequencyMS,
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currentTime,
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timeSinceLastCall
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};
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}
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_reschedule(ms) {
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if (this.stopped)
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return;
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if (this.timerId) {
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(0, timers_1.clearTimeout)(this.timerId);
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}
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this.timerId = (0, timers_1.setTimeout)(this._executeAndReschedule, ms || this.heartbeatFrequencyMS);
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}
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}
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exports.MonitorInterval = MonitorInterval;
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//# sourceMappingURL=monitor.js.map
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