Commit

node_modules/mongodb/lib/sdam/common.js

@@ -0,0 +1,49 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.ServerType = exports.TopologyType = exports.STATE_CONNECTED = exports.STATE_CONNECTING = exports.STATE_CLOSED = exports.STATE_CLOSING = void 0;
+exports._advanceClusterTime = _advanceClusterTime;
+// shared state names
+exports.STATE_CLOSING = 'closing';
+exports.STATE_CLOSED = 'closed';
+exports.STATE_CONNECTING = 'connecting';
+exports.STATE_CONNECTED = 'connected';
+/**
+ * An enumeration of topology types we know about
+ * @public
+ */
+exports.TopologyType = Object.freeze({
+    Single: 'Single',
+    ReplicaSetNoPrimary: 'ReplicaSetNoPrimary',
+    ReplicaSetWithPrimary: 'ReplicaSetWithPrimary',
+    Sharded: 'Sharded',
+    Unknown: 'Unknown',
+    LoadBalanced: 'LoadBalanced'
+});
+/**
+ * An enumeration of server types we know about
+ * @public
+ */
+exports.ServerType = Object.freeze({
+    Standalone: 'Standalone',
+    Mongos: 'Mongos',
+    PossiblePrimary: 'PossiblePrimary',
+    RSPrimary: 'RSPrimary',
+    RSSecondary: 'RSSecondary',
+    RSArbiter: 'RSArbiter',
+    RSOther: 'RSOther',
+    RSGhost: 'RSGhost',
+    Unknown: 'Unknown',
+    LoadBalancer: 'LoadBalancer'
+});
+/** Shared function to determine clusterTime for a given topology or session */
+function _advanceClusterTime(entity, $clusterTime) {
+    if (entity.clusterTime == null) {
+        entity.clusterTime = $clusterTime;
+    }
+    else {
+        if ($clusterTime.clusterTime.greaterThan(entity.clusterTime.clusterTime)) {
+            entity.clusterTime = $clusterTime;
+        }
+    }
+}
+//# sourceMappingURL=common.js.map

node_modules/mongodb/lib/sdam/common.js.map

@@ -0,0 +1 @@
+{"version":3,"file":"common.js","sourceRoot":"","sources":["../../src/sdam/common.ts"],"names":[],"mappings":";;;AA8DA,kDAWC;AArED,qBAAqB;AACR,QAAA,aAAa,GAAG,SAAS,CAAC;AAC1B,QAAA,YAAY,GAAG,QAAQ,CAAC;AACxB,QAAA,gBAAgB,GAAG,YAAY,CAAC;AAChC,QAAA,eAAe,GAAG,WAAW,CAAC;AAE3C;;;GAGG;AACU,QAAA,YAAY,GAAG,MAAM,CAAC,MAAM,CAAC;IACxC,MAAM,EAAE,QAAQ;IAChB,mBAAmB,EAAE,qBAAqB;IAC1C,qBAAqB,EAAE,uBAAuB;IAC9C,OAAO,EAAE,SAAS;IAClB,OAAO,EAAE,SAAS;IAClB,YAAY,EAAE,cAAc;CACpB,CAAC,CAAC;AAKZ;;;GAGG;AACU,QAAA,UAAU,GAAG,MAAM,CAAC,MAAM,CAAC;IACtC,UAAU,EAAE,YAAY;IACxB,MAAM,EAAE,QAAQ;IAChB,eAAe,EAAE,iBAAiB;IAClC,SAAS,EAAE,WAAW;IACtB,WAAW,EAAE,aAAa;IAC1B,SAAS,EAAE,WAAW;IACtB,OAAO,EAAE,SAAS;IAClB,OAAO,EAAE,SAAS;IAClB,OAAO,EAAE,SAAS;IAClB,YAAY,EAAE,cAAc;CACpB,CAAC,CAAC;AAoBZ,+EAA+E;AAC/E,SAAgB,mBAAmB,CACjC,MAAgC,EAChC,YAAyB;IAEzB,IAAI,MAAM,CAAC,WAAW,IAAI,IAAI,EAAE,CAAC;QAC/B,MAAM,CAAC,WAAW,GAAG,YAAY,CAAC;IACpC,CAAC;SAAM,CAAC;QACN,IAAI,YAAY,CAAC,WAAW,CAAC,WAAW,CAAC,MAAM,CAAC,WAAW,CAAC,WAAW,CAAC,EAAE,CAAC;YACzE,MAAM,CAAC,WAAW,GAAG,YAAY,CAAC;QACpC,CAAC;IACH,CAAC;AACH,CAAC"}

node_modules/mongodb/lib/sdam/events.js

@@ -0,0 +1,146 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.ServerHeartbeatFailedEvent = exports.ServerHeartbeatSucceededEvent = exports.ServerHeartbeatStartedEvent = exports.TopologyClosedEvent = exports.TopologyOpeningEvent = exports.TopologyDescriptionChangedEvent = exports.ServerClosedEvent = exports.ServerOpeningEvent = exports.ServerDescriptionChangedEvent = void 0;
+const constants_1 = require("../constants");
+/**
+ * Emitted when server description changes, but does NOT include changes to the RTT.
+ * @public
+ * @category Event
+ */
+class ServerDescriptionChangedEvent {
+    /** @internal */
+    constructor(topologyId, address, previousDescription, newDescription) {
+        this.name = constants_1.SERVER_DESCRIPTION_CHANGED;
+        this.topologyId = topologyId;
+        this.address = address;
+        this.previousDescription = previousDescription;
+        this.newDescription = newDescription;
+    }
+}
+exports.ServerDescriptionChangedEvent = ServerDescriptionChangedEvent;
+/**
+ * Emitted when server is initialized.
+ * @public
+ * @category Event
+ */
+class ServerOpeningEvent {
+    /** @internal */
+    constructor(topologyId, address) {
+        /** @internal */
+        this.name = constants_1.SERVER_OPENING;
+        this.topologyId = topologyId;
+        this.address = address;
+    }
+}
+exports.ServerOpeningEvent = ServerOpeningEvent;
+/**
+ * Emitted when server is closed.
+ * @public
+ * @category Event
+ */
+class ServerClosedEvent {
+    /** @internal */
+    constructor(topologyId, address) {
+        /** @internal */
+        this.name = constants_1.SERVER_CLOSED;
+        this.topologyId = topologyId;
+        this.address = address;
+    }
+}
+exports.ServerClosedEvent = ServerClosedEvent;
+/**
+ * Emitted when topology description changes.
+ * @public
+ * @category Event
+ */
+class TopologyDescriptionChangedEvent {
+    /** @internal */
+    constructor(topologyId, previousDescription, newDescription) {
+        /** @internal */
+        this.name = constants_1.TOPOLOGY_DESCRIPTION_CHANGED;
+        this.topologyId = topologyId;
+        this.previousDescription = previousDescription;
+        this.newDescription = newDescription;
+    }
+}
+exports.TopologyDescriptionChangedEvent = TopologyDescriptionChangedEvent;
+/**
+ * Emitted when topology is initialized.
+ * @public
+ * @category Event
+ */
+class TopologyOpeningEvent {
+    /** @internal */
+    constructor(topologyId) {
+        /** @internal */
+        this.name = constants_1.TOPOLOGY_OPENING;
+        this.topologyId = topologyId;
+    }
+}
+exports.TopologyOpeningEvent = TopologyOpeningEvent;
+/**
+ * Emitted when topology is closed.
+ * @public
+ * @category Event
+ */
+class TopologyClosedEvent {
+    /** @internal */
+    constructor(topologyId) {
+        /** @internal */
+        this.name = constants_1.TOPOLOGY_CLOSED;
+        this.topologyId = topologyId;
+    }
+}
+exports.TopologyClosedEvent = TopologyClosedEvent;
+/**
+ * Emitted when the server monitor’s hello command is started - immediately before
+ * the hello command is serialized into raw BSON and written to the socket.
+ *
+ * @public
+ * @category Event
+ */
+class ServerHeartbeatStartedEvent {
+    /** @internal */
+    constructor(connectionId, awaited) {
+        /** @internal */
+        this.name = constants_1.SERVER_HEARTBEAT_STARTED;
+        this.connectionId = connectionId;
+        this.awaited = awaited;
+    }
+}
+exports.ServerHeartbeatStartedEvent = ServerHeartbeatStartedEvent;
+/**
+ * Emitted when the server monitor’s hello succeeds.
+ * @public
+ * @category Event
+ */
+class ServerHeartbeatSucceededEvent {
+    /** @internal */
+    constructor(connectionId, duration, reply, awaited) {
+        /** @internal */
+        this.name = constants_1.SERVER_HEARTBEAT_SUCCEEDED;
+        this.connectionId = connectionId;
+        this.duration = duration;
+        this.reply = reply ?? {};
+        this.awaited = awaited;
+    }
+}
+exports.ServerHeartbeatSucceededEvent = ServerHeartbeatSucceededEvent;
+/**
+ * Emitted when the server monitor’s hello fails, either with an “ok: 0” or a socket exception.
+ * @public
+ * @category Event
+ */
+class ServerHeartbeatFailedEvent {
+    /** @internal */
+    constructor(connectionId, duration, failure, awaited) {
+        /** @internal */
+        this.name = constants_1.SERVER_HEARTBEAT_FAILED;
+        this.connectionId = connectionId;
+        this.duration = duration;
+        this.failure = failure;
+        this.awaited = awaited;
+    }
+}
+exports.ServerHeartbeatFailedEvent = ServerHeartbeatFailedEvent;
+//# sourceMappingURL=events.js.map

node_modules/mongodb/lib/sdam/events.js.map

@@ -0,0 +1 @@
+{"version":3,"file":"events.js","sourceRoot":"","sources":["../../src/sdam/events.ts"],"names":[],"mappings":";;;AACA,4CAUsB;AAItB;;;;GAIG;AACH,MAAa,6BAA6B;IAWxC,gBAAgB;IAChB,YACE,UAAkB,EAClB,OAAe,EACf,mBAAsC,EACtC,cAAiC;QAPnC,SAAI,GAAG,sCAA0B,CAAC;QAShC,IAAI,CAAC,UAAU,GAAG,UAAU,CAAC;QAC7B,IAAI,CAAC,OAAO,GAAG,OAAO,CAAC;QACvB,IAAI,CAAC,mBAAmB,GAAG,mBAAmB,CAAC;QAC/C,IAAI,CAAC,cAAc,GAAG,cAAc,CAAC;IACvC,CAAC;CACF;AAvBD,sEAuBC;AAED;;;;GAIG;AACH,MAAa,kBAAkB;IAQ7B,gBAAgB;IAChB,YAAY,UAAkB,EAAE,OAAe;QAJ/C,gBAAgB;QAChB,SAAI,GAAG,0BAAc,CAAC;QAIpB,IAAI,CAAC,UAAU,GAAG,UAAU,CAAC;QAC7B,IAAI,CAAC,OAAO,GAAG,OAAO,CAAC;IACzB,CAAC;CACF;AAbD,gDAaC;AAED;;;;GAIG;AACH,MAAa,iBAAiB;IAQ5B,gBAAgB;IAChB,YAAY,UAAkB,EAAE,OAAe;QAJ/C,gBAAgB;QAChB,SAAI,GAAG,yBAAa,CAAC;QAInB,IAAI,CAAC,UAAU,GAAG,UAAU,CAAC;QAC7B,IAAI,CAAC,OAAO,GAAG,OAAO,CAAC;IACzB,CAAC;CACF;AAbD,8CAaC;AAED;;;;GAIG;AACH,MAAa,+BAA+B;IAU1C,gBAAgB;IAChB,YACE,UAAkB,EAClB,mBAAwC,EACxC,cAAmC;QAPrC,gBAAgB;QAChB,SAAI,GAAG,wCAA4B,CAAC;QAQlC,IAAI,CAAC,UAAU,GAAG,UAAU,CAAC;QAC7B,IAAI,CAAC,mBAAmB,GAAG,mBAAmB,CAAC;QAC/C,IAAI,CAAC,cAAc,GAAG,cAAc,CAAC;IACvC,CAAC;CACF;AApBD,0EAoBC;AAED;;;;GAIG;AACH,MAAa,oBAAoB;IAM/B,gBAAgB;IAChB,YAAY,UAAkB;QAJ9B,gBAAgB;QAChB,SAAI,GAAG,4BAAgB,CAAC;QAItB,IAAI,CAAC,UAAU,GAAG,UAAU,CAAC;IAC/B,CAAC;CACF;AAVD,oDAUC;AAED;;;;GAIG;AACH,MAAa,mBAAmB;IAM9B,gBAAgB;IAChB,YAAY,UAAkB;QAJ9B,gBAAgB;QAChB,SAAI,GAAG,2BAAe,CAAC;QAIrB,IAAI,CAAC,UAAU,GAAG,UAAU,CAAC;IAC/B,CAAC;CACF;AAVD,kDAUC;AAED;;;;;;GAMG;AACH,MAAa,2BAA2B;IAQtC,gBAAgB;IAChB,YAAY,YAAoB,EAAE,OAAgB;QAJlD,gBAAgB;QAChB,SAAI,GAAG,oCAAwB,CAAC;QAI9B,IAAI,CAAC,YAAY,GAAG,YAAY,CAAC;QACjC,IAAI,CAAC,OAAO,GAAG,OAAO,CAAC;IACzB,CAAC;CACF;AAbD,kEAaC;AAED;;;;GAIG;AACH,MAAa,6BAA6B;IAYxC,gBAAgB;IAChB,YAAY,YAAoB,EAAE,QAAgB,EAAE,KAAsB,EAAE,OAAgB;QAJ5F,gBAAgB;QAChB,SAAI,GAAG,sCAA0B,CAAC;QAIhC,IAAI,CAAC,YAAY,GAAG,YAAY,CAAC;QACjC,IAAI,CAAC,QAAQ,GAAG,QAAQ,CAAC;QACzB,IAAI,CAAC,KAAK,GAAG,KAAK,IAAI,EAAE,CAAC;QACzB,IAAI,CAAC,OAAO,GAAG,OAAO,CAAC;IACzB,CAAC;CACF;AAnBD,sEAmBC;AAED;;;;GAIG;AACH,MAAa,0BAA0B;IAYrC,gBAAgB;IAChB,YAAY,YAAoB,EAAE,QAAgB,EAAE,OAAc,EAAE,OAAgB;QAJpF,gBAAgB;QAChB,SAAI,GAAG,mCAAuB,CAAC;QAI7B,IAAI,CAAC,YAAY,GAAG,YAAY,CAAC;QACjC,IAAI,CAAC,QAAQ,GAAG,QAAQ,CAAC;QACzB,IAAI,CAAC,OAAO,GAAG,OAAO,CAAC;QACvB,IAAI,CAAC,OAAO,GAAG,OAAO,CAAC;IACzB,CAAC;CACF;AAnBD,gEAmBC"}

node_modules/mongodb/lib/sdam/monitor.js

@@ -0,0 +1,544 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.RTTSampler = exports.MonitorInterval = exports.RTTPinger = exports.Monitor = exports.ServerMonitoringMode = void 0;
+const timers_1 = require("timers");
+const bson_1 = require("../bson");
+const connect_1 = require("../cmap/connect");
+const client_metadata_1 = require("../cmap/handshake/client_metadata");
+const constants_1 = require("../constants");
+const error_1 = require("../error");
+const mongo_logger_1 = require("../mongo_logger");
+const mongo_types_1 = require("../mongo_types");
+const utils_1 = require("../utils");
+const common_1 = require("./common");
+const events_1 = require("./events");
+const server_1 = require("./server");
+const STATE_IDLE = 'idle';
+const STATE_MONITORING = 'monitoring';
+const stateTransition = (0, utils_1.makeStateMachine)({
+    [common_1.STATE_CLOSING]: [common_1.STATE_CLOSING, STATE_IDLE, common_1.STATE_CLOSED],
+    [common_1.STATE_CLOSED]: [common_1.STATE_CLOSED, STATE_MONITORING],
+    [STATE_IDLE]: [STATE_IDLE, STATE_MONITORING, common_1.STATE_CLOSING],
+    [STATE_MONITORING]: [STATE_MONITORING, STATE_IDLE, common_1.STATE_CLOSING]
+});
+const INVALID_REQUEST_CHECK_STATES = new Set([common_1.STATE_CLOSING, common_1.STATE_CLOSED, STATE_MONITORING]);
+function isInCloseState(monitor) {
+    return monitor.s.state === common_1.STATE_CLOSED || monitor.s.state === common_1.STATE_CLOSING;
+}
+/** @public */
+exports.ServerMonitoringMode = Object.freeze({
+    auto: 'auto',
+    poll: 'poll',
+    stream: 'stream'
+});
+/** @internal */
+class Monitor extends mongo_types_1.TypedEventEmitter {
+    constructor(server, options) {
+        super();
+        /** @internal */
+        this.component = mongo_logger_1.MongoLoggableComponent.TOPOLOGY;
+        this.on('error', utils_1.noop);
+        this.server = server;
+        this.connection = null;
+        this.cancellationToken = new mongo_types_1.CancellationToken();
+        this.cancellationToken.setMaxListeners(Infinity);
+        this.monitorId = undefined;
+        this.s = {
+            state: common_1.STATE_CLOSED
+        };
+        this.address = server.description.address;
+        this.options = Object.freeze({
+            connectTimeoutMS: options.connectTimeoutMS ?? 10000,
+            heartbeatFrequencyMS: options.heartbeatFrequencyMS ?? 10000,
+            minHeartbeatFrequencyMS: options.minHeartbeatFrequencyMS ?? 500,
+            serverMonitoringMode: options.serverMonitoringMode
+        });
+        this.isRunningInFaasEnv = (0, client_metadata_1.getFAASEnv)() != null;
+        this.mongoLogger = this.server.topology.client?.mongoLogger;
+        this.rttSampler = new RTTSampler(10);
+        const cancellationToken = this.cancellationToken;
+        // TODO: refactor this to pull it directly from the pool, requires new ConnectionPool integration
+        const connectOptions = {
+            id: '<monitor>',
+            generation: server.pool.generation,
+            cancellationToken,
+            hostAddress: server.description.hostAddress,
+            ...options,
+            // force BSON serialization options
+            raw: false,
+            useBigInt64: false,
+            promoteLongs: true,
+            promoteValues: true,
+            promoteBuffers: true
+        };
+        // ensure no authentication is used for monitoring
+        delete connectOptions.credentials;
+        if (connectOptions.autoEncrypter) {
+            delete connectOptions.autoEncrypter;
+        }
+        this.connectOptions = Object.freeze(connectOptions);
+    }
+    connect() {
+        if (this.s.state !== common_1.STATE_CLOSED) {
+            return;
+        }
+        // start
+        const heartbeatFrequencyMS = this.options.heartbeatFrequencyMS;
+        const minHeartbeatFrequencyMS = this.options.minHeartbeatFrequencyMS;
+        this.monitorId = new MonitorInterval(monitorServer(this), {
+            heartbeatFrequencyMS: heartbeatFrequencyMS,
+            minHeartbeatFrequencyMS: minHeartbeatFrequencyMS,
+            immediate: true
+        });
+    }
+    requestCheck() {
+        if (INVALID_REQUEST_CHECK_STATES.has(this.s.state)) {
+            return;
+        }
+        this.monitorId?.wake();
+    }
+    reset() {
+        const topologyVersion = this.server.description.topologyVersion;
+        if (isInCloseState(this) || topologyVersion == null) {
+            return;
+        }
+        stateTransition(this, common_1.STATE_CLOSING);
+        resetMonitorState(this);
+        // restart monitor
+        stateTransition(this, STATE_IDLE);
+        // restart monitoring
+        const heartbeatFrequencyMS = this.options.heartbeatFrequencyMS;
+        const minHeartbeatFrequencyMS = this.options.minHeartbeatFrequencyMS;
+        this.monitorId = new MonitorInterval(monitorServer(this), {
+            heartbeatFrequencyMS: heartbeatFrequencyMS,
+            minHeartbeatFrequencyMS: minHeartbeatFrequencyMS
+        });
+    }
+    close() {
+        if (isInCloseState(this)) {
+            return;
+        }
+        stateTransition(this, common_1.STATE_CLOSING);
+        resetMonitorState(this);
+        // close monitor
+        this.emit('close');
+        stateTransition(this, common_1.STATE_CLOSED);
+    }
+    get roundTripTime() {
+        return this.rttSampler.average();
+    }
+    get minRoundTripTime() {
+        return this.rttSampler.min();
+    }
+    get latestRtt() {
+        return this.rttSampler.last;
+    }
+    addRttSample(rtt) {
+        this.rttSampler.addSample(rtt);
+    }
+    clearRttSamples() {
+        this.rttSampler.clear();
+    }
+}
+exports.Monitor = Monitor;
+function resetMonitorState(monitor) {
+    monitor.monitorId?.stop();
+    monitor.monitorId = undefined;
+    monitor.rttPinger?.close();
+    monitor.rttPinger = undefined;
+    monitor.cancellationToken.emit('cancel');
+    monitor.connection?.destroy();
+    monitor.connection = null;
+    monitor.clearRttSamples();
+}
+function useStreamingProtocol(monitor, topologyVersion) {
+    // If we have no topology version we always poll no matter
+    // what the user provided, since the server does not support
+    // the streaming protocol.
+    if (topologyVersion == null)
+        return false;
+    const serverMonitoringMode = monitor.options.serverMonitoringMode;
+    if (serverMonitoringMode === exports.ServerMonitoringMode.poll)
+        return false;
+    if (serverMonitoringMode === exports.ServerMonitoringMode.stream)
+        return true;
+    // If we are in auto mode, we need to figure out if we're in a FaaS
+    // environment or not and choose the appropriate mode.
+    if (monitor.isRunningInFaasEnv)
+        return false;
+    return true;
+}
+function checkServer(monitor, callback) {
+    let start;
+    let awaited;
+    const topologyVersion = monitor.server.description.topologyVersion;
+    const isAwaitable = useStreamingProtocol(monitor, topologyVersion);
+    monitor.emitAndLogHeartbeat(server_1.Server.SERVER_HEARTBEAT_STARTED, monitor.server.topology.s.id, undefined, new events_1.ServerHeartbeatStartedEvent(monitor.address, isAwaitable));
+    function onHeartbeatFailed(err) {
+        monitor.connection?.destroy();
+        monitor.connection = null;
+        monitor.emitAndLogHeartbeat(server_1.Server.SERVER_HEARTBEAT_FAILED, monitor.server.topology.s.id, undefined, new events_1.ServerHeartbeatFailedEvent(monitor.address, (0, utils_1.calculateDurationInMs)(start), err, awaited));
+        const error = !(err instanceof error_1.MongoError)
+            ? new error_1.MongoError(error_1.MongoError.buildErrorMessage(err), { cause: err })
+            : err;
+        error.addErrorLabel(error_1.MongoErrorLabel.ResetPool);
+        if (error instanceof error_1.MongoNetworkTimeoutError) {
+            error.addErrorLabel(error_1.MongoErrorLabel.InterruptInUseConnections);
+        }
+        monitor.emit('resetServer', error);
+        callback(err);
+    }
+    function onHeartbeatSucceeded(hello) {
+        if (!('isWritablePrimary' in hello)) {
+            // Provide hello-style response document.
+            hello.isWritablePrimary = hello[constants_1.LEGACY_HELLO_COMMAND];
+        }
+        // NOTE: here we use the latestRtt as this measurement corresponds with the value
+        // obtained for this successful heartbeat, if there is no latestRtt, then we calculate the
+        // duration
+        const duration = isAwaitable && monitor.rttPinger
+            ? (monitor.rttPinger.latestRtt ?? (0, utils_1.calculateDurationInMs)(start))
+            : (0, utils_1.calculateDurationInMs)(start);
+        monitor.addRttSample(duration);
+        monitor.emitAndLogHeartbeat(server_1.Server.SERVER_HEARTBEAT_SUCCEEDED, monitor.server.topology.s.id, hello.connectionId, new events_1.ServerHeartbeatSucceededEvent(monitor.address, duration, hello, isAwaitable));
+        if (isAwaitable) {
+            // If we are using the streaming protocol then we immediately issue another 'started'
+            // event, otherwise the "check" is complete and return to the main monitor loop
+            monitor.emitAndLogHeartbeat(server_1.Server.SERVER_HEARTBEAT_STARTED, monitor.server.topology.s.id, undefined, new events_1.ServerHeartbeatStartedEvent(monitor.address, true));
+            // We have not actually sent an outgoing handshake, but when we get the next response we
+            // want the duration to reflect the time since we last heard from the server
+            start = (0, utils_1.now)();
+        }
+        else {
+            monitor.rttPinger?.close();
+            monitor.rttPinger = undefined;
+            callback(undefined, hello);
+        }
+    }
+    const { connection } = monitor;
+    if (connection && !connection.closed) {
+        const { serverApi, helloOk } = connection;
+        const connectTimeoutMS = monitor.options.connectTimeoutMS;
+        const maxAwaitTimeMS = monitor.options.heartbeatFrequencyMS;
+        const cmd = {
+            [serverApi?.version || helloOk ? 'hello' : constants_1.LEGACY_HELLO_COMMAND]: 1,
+            ...(isAwaitable && topologyVersion
+                ? { maxAwaitTimeMS, topologyVersion: makeTopologyVersion(topologyVersion) }
+                : {})
+        };
+        const options = isAwaitable
+            ? {
+                socketTimeoutMS: connectTimeoutMS ? connectTimeoutMS + maxAwaitTimeMS : 0,
+                exhaustAllowed: true
+            }
+            : { socketTimeoutMS: connectTimeoutMS };
+        if (isAwaitable && monitor.rttPinger == null) {
+            monitor.rttPinger = new RTTPinger(monitor);
+        }
+        // Record new start time before sending handshake
+        start = (0, utils_1.now)();
+        if (isAwaitable) {
+            awaited = true;
+            return connection.exhaustCommand((0, utils_1.ns)('admin.$cmd'), cmd, options, (error, hello) => {
+                if (error)
+                    return onHeartbeatFailed(error);
+                return onHeartbeatSucceeded(hello);
+            });
+        }
+        awaited = false;
+        connection
+            .command((0, utils_1.ns)('admin.$cmd'), cmd, options)
+            .then(onHeartbeatSucceeded, onHeartbeatFailed);
+        return;
+    }
+    // connecting does an implicit `hello`
+    (async () => {
+        const socket = await (0, connect_1.makeSocket)(monitor.connectOptions);
+        const connection = (0, connect_1.makeConnection)(monitor.connectOptions, socket);
+        // The start time is after socket creation but before the handshake
+        start = (0, utils_1.now)();
+        try {
+            await (0, connect_1.performInitialHandshake)(connection, monitor.connectOptions);
+            return connection;
+        }
+        catch (error) {
+            connection.destroy();
+            throw error;
+        }
+    })().then(connection => {
+        if (isInCloseState(monitor)) {
+            connection.destroy();
+            return;
+        }
+        const duration = (0, utils_1.calculateDurationInMs)(start);
+        monitor.addRttSample(duration);
+        monitor.connection = connection;
+        monitor.emitAndLogHeartbeat(server_1.Server.SERVER_HEARTBEAT_SUCCEEDED, monitor.server.topology.s.id, connection.hello?.connectionId, new events_1.ServerHeartbeatSucceededEvent(monitor.address, duration, connection.hello, useStreamingProtocol(monitor, connection.hello?.topologyVersion)));
+        callback(undefined, connection.hello);
+    }, error => {
+        monitor.connection = null;
+        awaited = false;
+        onHeartbeatFailed(error);
+    });
+}
+function monitorServer(monitor) {
+    return (callback) => {
+        if (monitor.s.state === STATE_MONITORING) {
+            process.nextTick(callback);
+            return;
+        }
+        stateTransition(monitor, STATE_MONITORING);
+        function done() {
+            if (!isInCloseState(monitor)) {
+                stateTransition(monitor, STATE_IDLE);
+            }
+            callback();
+        }
+        checkServer(monitor, (err, hello) => {
+            if (err) {
+                // otherwise an error occurred on initial discovery, also bail
+                if (monitor.server.description.type === common_1.ServerType.Unknown) {
+                    return done();
+                }
+            }
+            // if the check indicates streaming is supported, immediately reschedule monitoring
+            if (useStreamingProtocol(monitor, hello?.topologyVersion)) {
+                (0, timers_1.setTimeout)(() => {
+                    if (!isInCloseState(monitor)) {
+                        monitor.monitorId?.wake();
+                    }
+                }, 0);
+            }
+            done();
+        });
+    };
+}
+function makeTopologyVersion(tv) {
+    return {
+        processId: tv.processId,
+        // tests mock counter as just number, but in a real situation counter should always be a Long
+        // TODO(NODE-2674): Preserve int64 sent from MongoDB
+        counter: bson_1.Long.isLong(tv.counter) ? tv.counter : bson_1.Long.fromNumber(tv.counter)
+    };
+}
+/** @internal */
+class RTTPinger {
+    constructor(monitor) {
+        this.connection = undefined;
+        this.cancellationToken = monitor.cancellationToken;
+        this.closed = false;
+        this.monitor = monitor;
+        this.latestRtt = monitor.latestRtt ?? undefined;
+        const heartbeatFrequencyMS = monitor.options.heartbeatFrequencyMS;
+        this.monitorId = (0, timers_1.setTimeout)(() => this.measureRoundTripTime(), heartbeatFrequencyMS);
+    }
+    get roundTripTime() {
+        return this.monitor.roundTripTime;
+    }
+    get minRoundTripTime() {
+        return this.monitor.minRoundTripTime;
+    }
+    close() {
+        this.closed = true;
+        (0, timers_1.clearTimeout)(this.monitorId);
+        this.connection?.destroy();
+        this.connection = undefined;
+    }
+    measureAndReschedule(start, conn) {
+        if (this.closed) {
+            conn?.destroy();
+            return;
+        }
+        if (this.connection == null) {
+            this.connection = conn;
+        }
+        this.latestRtt = (0, utils_1.calculateDurationInMs)(start);
+        this.monitorId = (0, timers_1.setTimeout)(() => this.measureRoundTripTime(), this.monitor.options.heartbeatFrequencyMS);
+    }
+    measureRoundTripTime() {
+        const start = (0, utils_1.now)();
+        if (this.closed) {
+            return;
+        }
+        const connection = this.connection;
+        if (connection == null) {
+            (0, connect_1.connect)(this.monitor.connectOptions).then(connection => {
+                this.measureAndReschedule(start, connection);
+            }, () => {
+                this.connection = undefined;
+            });
+            return;
+        }
+        const commandName = connection.serverApi?.version || connection.helloOk ? 'hello' : constants_1.LEGACY_HELLO_COMMAND;
+        connection.command((0, utils_1.ns)('admin.$cmd'), { [commandName]: 1 }, undefined).then(() => this.measureAndReschedule(start), () => {
+            this.connection?.destroy();
+            this.connection = undefined;
+            return;
+        });
+    }
+}
+exports.RTTPinger = RTTPinger;
+/**
+ * @internal
+ */
+class MonitorInterval {
+    constructor(fn, options = {}) {
+        this.isExpeditedCallToFnScheduled = false;
+        this.stopped = false;
+        this.isExecutionInProgress = false;
+        this.hasExecutedOnce = false;
+        this._executeAndReschedule = () => {
+            if (this.stopped)
+                return;
+            if (this.timerId) {
+                (0, timers_1.clearTimeout)(this.timerId);
+            }
+            this.isExpeditedCallToFnScheduled = false;
+            this.isExecutionInProgress = true;
+            this.fn(() => {
+                this.lastExecutionEnded = (0, utils_1.now)();
+                this.isExecutionInProgress = false;
+                this._reschedule(this.heartbeatFrequencyMS);
+            });
+        };
+        this.fn = fn;
+        this.lastExecutionEnded = -Infinity;
+        this.heartbeatFrequencyMS = options.heartbeatFrequencyMS ?? 1000;
+        this.minHeartbeatFrequencyMS = options.minHeartbeatFrequencyMS ?? 500;
+        if (options.immediate) {
+            this._executeAndReschedule();
+        }
+        else {
+            this._reschedule(undefined);
+        }
+    }
+    wake() {
+        const currentTime = (0, utils_1.now)();
+        const timeSinceLastCall = currentTime - this.lastExecutionEnded;
+        // TODO(NODE-4674): Add error handling and logging to the monitor
+        if (timeSinceLastCall < 0) {
+            return this._executeAndReschedule();
+        }
+        if (this.isExecutionInProgress) {
+            return;
+        }
+        // debounce multiple calls to wake within the `minInterval`
+        if (this.isExpeditedCallToFnScheduled) {
+            return;
+        }
+        // reschedule a call as soon as possible, ensuring the call never happens
+        // faster than the `minInterval`
+        if (timeSinceLastCall < this.minHeartbeatFrequencyMS) {
+            this.isExpeditedCallToFnScheduled = true;
+            this._reschedule(this.minHeartbeatFrequencyMS - timeSinceLastCall);
+            return;
+        }
+        this._executeAndReschedule();
+    }
+    stop() {
+        this.stopped = true;
+        if (this.timerId) {
+            (0, timers_1.clearTimeout)(this.timerId);
+            this.timerId = undefined;
+        }
+        this.lastExecutionEnded = -Infinity;
+        this.isExpeditedCallToFnScheduled = false;
+    }
+    toString() {
+        return JSON.stringify(this);
+    }
+    toJSON() {
+        const currentTime = (0, utils_1.now)();
+        const timeSinceLastCall = currentTime - this.lastExecutionEnded;
+        return {
+            timerId: this.timerId != null ? 'set' : 'cleared',
+            lastCallTime: this.lastExecutionEnded,
+            isExpeditedCheckScheduled: this.isExpeditedCallToFnScheduled,
+            stopped: this.stopped,
+            heartbeatFrequencyMS: this.heartbeatFrequencyMS,
+            minHeartbeatFrequencyMS: this.minHeartbeatFrequencyMS,
+            currentTime,
+            timeSinceLastCall
+        };
+    }
+    _reschedule(ms) {
+        if (this.stopped)
+            return;
+        if (this.timerId) {
+            (0, timers_1.clearTimeout)(this.timerId);
+        }
+        this.timerId = (0, timers_1.setTimeout)(this._executeAndReschedule, ms || this.heartbeatFrequencyMS);
+    }
+}
+exports.MonitorInterval = MonitorInterval;
+/** @internal
+ * This class implements the RTT sampling logic specified for [CSOT](https://github.com/mongodb/specifications/blob/bbb335e60cd7ea1e0f7cd9a9443cb95fc9d3b64d/source/client-side-operations-timeout/client-side-operations-timeout.md#drivers-use-minimum-rtt-to-short-circuit-operations)
+ *
+ * This is implemented as a [circular buffer](https://en.wikipedia.org/wiki/Circular_buffer) keeping
+ * the most recent `windowSize` samples
+ * */
+class RTTSampler {
+    constructor(windowSize = 10) {
+        this.rttSamples = new Float64Array(windowSize);
+        this.length = 0;
+        this.writeIndex = 0;
+    }
+    /**
+     * Adds an rtt sample to the end of the circular buffer
+     * When `windowSize` samples have been collected, `addSample` overwrites the least recently added
+     * sample
+     */
+    addSample(sample) {
+        this.rttSamples[this.writeIndex++] = sample;
+        if (this.length < this.rttSamples.length) {
+            this.length++;
+        }
+        this.writeIndex %= this.rttSamples.length;
+    }
+    /**
+     * When \< 2 samples have been collected, returns 0
+     * Otherwise computes the minimum value samples contained in the buffer
+     */
+    min() {
+        if (this.length < 2)
+            return 0;
+        let min = this.rttSamples[0];
+        for (let i = 1; i < this.length; i++) {
+            if (this.rttSamples[i] < min)
+                min = this.rttSamples[i];
+        }
+        return min;
+    }
+    /**
+     * Returns mean of samples contained in the buffer
+     */
+    average() {
+        if (this.length === 0)
+            return 0;
+        let sum = 0;
+        for (let i = 0; i < this.length; i++) {
+            sum += this.rttSamples[i];
+        }
+        return sum / this.length;
+    }
+    /**
+     * Returns most recently inserted element in the buffer
+     * Returns null if the buffer is empty
+     * */
+    get last() {
+        if (this.length === 0)
+            return null;
+        return this.rttSamples[this.writeIndex === 0 ? this.length - 1 : this.writeIndex - 1];
+    }
+    /**
+     * Clear the buffer
+     * NOTE: this does not overwrite the data held in the internal array, just the pointers into
+     * this array
+     */
+    clear() {
+        this.length = 0;
+        this.writeIndex = 0;
+    }
+}
+exports.RTTSampler = RTTSampler;
+//# sourceMappingURL=monitor.js.map

node_modules/mongodb/lib/sdam/server.js

@@ -0,0 +1,392 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.Server = void 0;
+const connection_1 = require("../cmap/connection");
+const connection_pool_1 = require("../cmap/connection_pool");
+const errors_1 = require("../cmap/errors");
+const constants_1 = require("../constants");
+const error_1 = require("../error");
+const mongo_types_1 = require("../mongo_types");
+const aggregate_1 = require("../operations/aggregate");
+const transactions_1 = require("../transactions");
+const utils_1 = require("../utils");
+const write_concern_1 = require("../write_concern");
+const common_1 = require("./common");
+const monitor_1 = require("./monitor");
+const server_description_1 = require("./server_description");
+const server_selection_1 = require("./server_selection");
+const stateTransition = (0, utils_1.makeStateMachine)({
+    [common_1.STATE_CLOSED]: [common_1.STATE_CLOSED, common_1.STATE_CONNECTING],
+    [common_1.STATE_CONNECTING]: [common_1.STATE_CONNECTING, common_1.STATE_CLOSING, common_1.STATE_CONNECTED, common_1.STATE_CLOSED],
+    [common_1.STATE_CONNECTED]: [common_1.STATE_CONNECTED, common_1.STATE_CLOSING, common_1.STATE_CLOSED],
+    [common_1.STATE_CLOSING]: [common_1.STATE_CLOSING, common_1.STATE_CLOSED]
+});
+/** @internal */
+class Server extends mongo_types_1.TypedEventEmitter {
+    /** @event */
+    static { this.SERVER_HEARTBEAT_STARTED = constants_1.SERVER_HEARTBEAT_STARTED; }
+    /** @event */
+    static { this.SERVER_HEARTBEAT_SUCCEEDED = constants_1.SERVER_HEARTBEAT_SUCCEEDED; }
+    /** @event */
+    static { this.SERVER_HEARTBEAT_FAILED = constants_1.SERVER_HEARTBEAT_FAILED; }
+    /** @event */
+    static { this.CONNECT = constants_1.CONNECT; }
+    /** @event */
+    static { this.DESCRIPTION_RECEIVED = constants_1.DESCRIPTION_RECEIVED; }
+    /** @event */
+    static { this.CLOSED = constants_1.CLOSED; }
+    /** @event */
+    static { this.ENDED = constants_1.ENDED; }
+    /**
+     * Create a server
+     */
+    constructor(topology, description, options) {
+        super();
+        this.on('error', utils_1.noop);
+        this.serverApi = options.serverApi;
+        const poolOptions = { hostAddress: description.hostAddress, ...options };
+        this.topology = topology;
+        this.pool = new connection_pool_1.ConnectionPool(this, poolOptions);
+        this.s = {
+            description,
+            options,
+            state: common_1.STATE_CLOSED,
+            operationCount: 0
+        };
+        for (const event of [...constants_1.CMAP_EVENTS, ...constants_1.APM_EVENTS]) {
+            this.pool.on(event, (e) => this.emit(event, e));
+        }
+        this.pool.on(connection_1.Connection.CLUSTER_TIME_RECEIVED, (clusterTime) => {
+            this.clusterTime = clusterTime;
+        });
+        if (this.loadBalanced) {
+            this.monitor = null;
+            // monitoring is disabled in load balancing mode
+            return;
+        }
+        // create the monitor
+        this.monitor = new monitor_1.Monitor(this, this.s.options);
+        for (const event of constants_1.HEARTBEAT_EVENTS) {
+            this.monitor.on(event, (e) => this.emit(event, e));
+        }
+        this.monitor.on('resetServer', (error) => markServerUnknown(this, error));
+        this.monitor.on(Server.SERVER_HEARTBEAT_SUCCEEDED, (event) => {
+            this.emit(Server.DESCRIPTION_RECEIVED, new server_description_1.ServerDescription(this.description.hostAddress, event.reply, {
+                roundTripTime: this.monitor?.roundTripTime,
+                minRoundTripTime: this.monitor?.minRoundTripTime
+            }));
+            if (this.s.state === common_1.STATE_CONNECTING) {
+                stateTransition(this, common_1.STATE_CONNECTED);
+                this.emit(Server.CONNECT, this);
+            }
+        });
+    }
+    get clusterTime() {
+        return this.topology.clusterTime;
+    }
+    set clusterTime(clusterTime) {
+        this.topology.clusterTime = clusterTime;
+    }
+    get description() {
+        return this.s.description;
+    }
+    get name() {
+        return this.s.description.address;
+    }
+    get autoEncrypter() {
+        if (this.s.options && this.s.options.autoEncrypter) {
+            return this.s.options.autoEncrypter;
+        }
+        return;
+    }
+    get loadBalanced() {
+        return this.topology.description.type === common_1.TopologyType.LoadBalanced;
+    }
+    /**
+     * Initiate server connect
+     */
+    connect() {
+        if (this.s.state !== common_1.STATE_CLOSED) {
+            return;
+        }
+        stateTransition(this, common_1.STATE_CONNECTING);
+        // If in load balancer mode we automatically set the server to
+        // a load balancer. It never transitions out of this state and
+        // has no monitor.
+        if (!this.loadBalanced) {
+            this.monitor?.connect();
+        }
+        else {
+            stateTransition(this, common_1.STATE_CONNECTED);
+            this.emit(Server.CONNECT, this);
+        }
+    }
+    closeCheckedOutConnections() {
+        return this.pool.closeCheckedOutConnections();
+    }
+    /** Destroy the server connection */
+    close() {
+        if (this.s.state === common_1.STATE_CLOSED) {
+            return;
+        }
+        stateTransition(this, common_1.STATE_CLOSING);
+        if (!this.loadBalanced) {
+            this.monitor?.close();
+        }
+        this.pool.close();
+        stateTransition(this, common_1.STATE_CLOSED);
+        this.emit('closed');
+    }
+    /**
+     * Immediately schedule monitoring of this server. If there already an attempt being made
+     * this will be a no-op.
+     */
+    requestCheck() {
+        if (!this.loadBalanced) {
+            this.monitor?.requestCheck();
+        }
+    }
+    async command(operation, timeoutContext) {
+        if (this.s.state === common_1.STATE_CLOSING || this.s.state === common_1.STATE_CLOSED) {
+            throw new error_1.MongoServerClosedError();
+        }
+        const session = operation.session;
+        let conn = session?.pinnedConnection;
+        this.incrementOperationCount();
+        if (conn == null) {
+            try {
+                conn = await this.pool.checkOut({ timeoutContext, signal: operation.options.signal });
+            }
+            catch (checkoutError) {
+                this.decrementOperationCount();
+                if (!(checkoutError instanceof errors_1.PoolClearedError))
+                    this.handleError(checkoutError);
+                throw checkoutError;
+            }
+        }
+        let reauthPromise = null;
+        const cleanup = () => {
+            this.decrementOperationCount();
+            if (session?.pinnedConnection !== conn) {
+                if (reauthPromise != null) {
+                    // The reauth promise only exists if it hasn't thrown.
+                    const checkBackIn = () => {
+                        this.pool.checkIn(conn);
+                    };
+                    void reauthPromise.then(checkBackIn, checkBackIn);
+                }
+                else {
+                    this.pool.checkIn(conn);
+                }
+            }
+        };
+        let cmd;
+        try {
+            cmd = operation.buildCommand(conn, session);
+        }
+        catch (e) {
+            cleanup();
+            throw e;
+        }
+        const options = operation.buildOptions(timeoutContext);
+        const ns = operation.ns;
+        if (this.loadBalanced && isPinnableCommand(cmd, session) && !session?.pinnedConnection) {
+            session?.pin(conn);
+        }
+        options.directConnection = this.topology.s.options.directConnection;
+        const omitReadPreference = operation instanceof aggregate_1.AggregateOperation &&
+            operation.hasWriteStage &&
+            (0, utils_1.maxWireVersion)(conn) < server_selection_1.MIN_SECONDARY_WRITE_WIRE_VERSION;
+        if (omitReadPreference) {
+            delete options.readPreference;
+        }
+        if (this.description.iscryptd) {
+            options.omitMaxTimeMS = true;
+        }
+        try {
+            try {
+                const res = await conn.command(ns, cmd, options, operation.SERVER_COMMAND_RESPONSE_TYPE);
+                (0, write_concern_1.throwIfWriteConcernError)(res);
+                return res;
+            }
+            catch (commandError) {
+                throw this.decorateCommandError(conn, cmd, options, commandError);
+            }
+        }
+        catch (operationError) {
+            if (operationError instanceof error_1.MongoError &&
+                operationError.code === error_1.MONGODB_ERROR_CODES.Reauthenticate) {
+                reauthPromise = this.pool.reauthenticate(conn);
+                reauthPromise.then(undefined, error => {
+                    reauthPromise = null;
+                    (0, utils_1.squashError)(error);
+                });
+                await (0, utils_1.abortable)(reauthPromise, options);
+                reauthPromise = null; // only reachable if reauth succeeds
+                try {
+                    const res = await conn.command(ns, cmd, options, operation.SERVER_COMMAND_RESPONSE_TYPE);
+                    (0, write_concern_1.throwIfWriteConcernError)(res);
+                    return res;
+                }
+                catch (commandError) {
+                    throw this.decorateCommandError(conn, cmd, options, commandError);
+                }
+            }
+            else {
+                throw operationError;
+            }
+        }
+        finally {
+            cleanup();
+        }
+    }
+    /**
+     * Handle SDAM error
+     * @internal
+     */
+    handleError(error, connection) {
+        if (!(error instanceof error_1.MongoError)) {
+            return;
+        }
+        const isStaleError = error.connectionGeneration && error.connectionGeneration < this.pool.generation;
+        if (isStaleError) {
+            return;
+        }
+        const isNetworkNonTimeoutError = error instanceof error_1.MongoNetworkError && !(error instanceof error_1.MongoNetworkTimeoutError);
+        const isNetworkTimeoutBeforeHandshakeError = error instanceof error_1.MongoNetworkError && error.beforeHandshake;
+        const isAuthHandshakeError = error.hasErrorLabel(error_1.MongoErrorLabel.HandshakeError);
+        if (isNetworkNonTimeoutError || isNetworkTimeoutBeforeHandshakeError || isAuthHandshakeError) {
+            // In load balanced mode we never mark the server as unknown and always
+            // clear for the specific service id.
+            if (!this.loadBalanced) {
+                error.addErrorLabel(error_1.MongoErrorLabel.ResetPool);
+                markServerUnknown(this, error);
+            }
+            else if (connection) {
+                this.pool.clear({ serviceId: connection.serviceId });
+            }
+        }
+        else {
+            if ((0, error_1.isSDAMUnrecoverableError)(error)) {
+                if (shouldHandleStateChangeError(this, error)) {
+                    const shouldClearPool = (0, error_1.isNodeShuttingDownError)(error);
+                    if (this.loadBalanced && connection && shouldClearPool) {
+                        this.pool.clear({ serviceId: connection.serviceId });
+                    }
+                    if (!this.loadBalanced) {
+                        if (shouldClearPool) {
+                            error.addErrorLabel(error_1.MongoErrorLabel.ResetPool);
+                        }
+                        markServerUnknown(this, error);
+                        process.nextTick(() => this.requestCheck());
+                    }
+                }
+            }
+        }
+    }
+    /**
+     * Ensure that error is properly decorated and internal state is updated before throwing
+     * @internal
+     */
+    decorateCommandError(connection, cmd, options, error) {
+        if (typeof error !== 'object' || error == null || !('name' in error)) {
+            throw new error_1.MongoRuntimeError('An unexpected error type: ' + typeof error);
+        }
+        if (error.name === 'AbortError' && 'cause' in error && error.cause instanceof error_1.MongoError) {
+            error = error.cause;
+        }
+        if (!(error instanceof error_1.MongoError)) {
+            // Node.js or some other error we have not special handling for
+            return error;
+        }
+        if (connectionIsStale(this.pool, connection)) {
+            return error;
+        }
+        const session = options?.session;
+        if (error instanceof error_1.MongoNetworkError) {
+            if (session && !session.hasEnded && session.serverSession) {
+                session.serverSession.isDirty = true;
+            }
+            // inActiveTransaction check handles commit and abort.
+            if (inActiveTransaction(session, cmd) &&
+                !error.hasErrorLabel(error_1.MongoErrorLabel.TransientTransactionError)) {
+                error.addErrorLabel(error_1.MongoErrorLabel.TransientTransactionError);
+            }
+            if ((isRetryableWritesEnabled(this.topology) || (0, transactions_1.isTransactionCommand)(cmd)) &&
+                (0, utils_1.supportsRetryableWrites)(this) &&
+                !inActiveTransaction(session, cmd)) {
+                error.addErrorLabel(error_1.MongoErrorLabel.RetryableWriteError);
+            }
+        }
+        else {
+            if ((isRetryableWritesEnabled(this.topology) || (0, transactions_1.isTransactionCommand)(cmd)) &&
+                (0, error_1.needsRetryableWriteLabel)(error, (0, utils_1.maxWireVersion)(this), this.description.type) &&
+                !inActiveTransaction(session, cmd)) {
+                error.addErrorLabel(error_1.MongoErrorLabel.RetryableWriteError);
+            }
+        }
+        if (session &&
+            session.isPinned &&
+            error.hasErrorLabel(error_1.MongoErrorLabel.TransientTransactionError)) {
+            session.unpin({ force: true });
+        }
+        this.handleError(error, connection);
+        return error;
+    }
+    /**
+     * Decrement the operation count, returning the new count.
+     */
+    decrementOperationCount() {
+        return (this.s.operationCount -= 1);
+    }
+    /**
+     * Increment the operation count, returning the new count.
+     */
+    incrementOperationCount() {
+        return (this.s.operationCount += 1);
+    }
+}
+exports.Server = Server;
+function markServerUnknown(server, error) {
+    // Load balancer servers can never be marked unknown.
+    if (server.loadBalanced) {
+        return;
+    }
+    if (error instanceof error_1.MongoNetworkError && !(error instanceof error_1.MongoNetworkTimeoutError)) {
+        server.monitor?.reset();
+    }
+    server.emit(Server.DESCRIPTION_RECEIVED, new server_description_1.ServerDescription(server.description.hostAddress, undefined, { error }));
+}
+function isPinnableCommand(cmd, session) {
+    if (session) {
+        return (session.inTransaction() ||
+            (session.transaction.isCommitted && 'commitTransaction' in cmd) ||
+            'aggregate' in cmd ||
+            'find' in cmd ||
+            'getMore' in cmd ||
+            'listCollections' in cmd ||
+            'listIndexes' in cmd ||
+            'bulkWrite' in cmd);
+    }
+    return false;
+}
+function connectionIsStale(pool, connection) {
+    if (connection.serviceId) {
+        return (connection.generation !== pool.serviceGenerations.get(connection.serviceId.toHexString()));
+    }
+    return connection.generation !== pool.generation;
+}
+function shouldHandleStateChangeError(server, err) {
+    const etv = err.topologyVersion;
+    const stv = server.description.topologyVersion;
+    return (0, server_description_1.compareTopologyVersion)(stv, etv) < 0;
+}
+function inActiveTransaction(session, cmd) {
+    return session && session.inTransaction() && !(0, transactions_1.isTransactionCommand)(cmd);
+}
+/** this checks the retryWrites option passed down from the client options, it
+ * does not check if the server supports retryable writes */
+function isRetryableWritesEnabled(topology) {
+    return topology.s.options.retryWrites !== false;
+}
+//# sourceMappingURL=server.js.map

node_modules/mongodb/lib/sdam/server_description.js

@@ -0,0 +1,204 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.ServerDescription = void 0;
+exports.parseServerType = parseServerType;
+exports.compareTopologyVersion = compareTopologyVersion;
+const bson_1 = require("../bson");
+const error_1 = require("../error");
+const utils_1 = require("../utils");
+const common_1 = require("./common");
+const WRITABLE_SERVER_TYPES = new Set([
+    common_1.ServerType.RSPrimary,
+    common_1.ServerType.Standalone,
+    common_1.ServerType.Mongos,
+    common_1.ServerType.LoadBalancer
+]);
+const DATA_BEARING_SERVER_TYPES = new Set([
+    common_1.ServerType.RSPrimary,
+    common_1.ServerType.RSSecondary,
+    common_1.ServerType.Mongos,
+    common_1.ServerType.Standalone,
+    common_1.ServerType.LoadBalancer
+]);
+/**
+ * The client's view of a single server, based on the most recent hello outcome.
+ *
+ * Internal type, not meant to be directly instantiated
+ * @public
+ */
+class ServerDescription {
+    /**
+     * Create a ServerDescription
+     * @internal
+     *
+     * @param address - The address of the server
+     * @param hello - An optional hello response for this server
+     */
+    constructor(address, hello, options = {}) {
+        if (address == null || address === '') {
+            throw new error_1.MongoRuntimeError('ServerDescription must be provided with a non-empty address');
+        }
+        this.address =
+            typeof address === 'string'
+                ? utils_1.HostAddress.fromString(address).toString() // Use HostAddress to normalize
+                : address.toString();
+        this.type = parseServerType(hello, options);
+        this.hosts = hello?.hosts?.map((host) => host.toLowerCase()) ?? [];
+        this.passives = hello?.passives?.map((host) => host.toLowerCase()) ?? [];
+        this.arbiters = hello?.arbiters?.map((host) => host.toLowerCase()) ?? [];
+        this.tags = hello?.tags ?? {};
+        this.minWireVersion = hello?.minWireVersion ?? 0;
+        this.maxWireVersion = hello?.maxWireVersion ?? 0;
+        this.roundTripTime = options?.roundTripTime ?? -1;
+        this.minRoundTripTime = options?.minRoundTripTime ?? 0;
+        this.lastUpdateTime = (0, utils_1.now)();
+        this.lastWriteDate = hello?.lastWrite?.lastWriteDate ?? 0;
+        // NOTE: This actually builds the stack string instead of holding onto the getter and all its
+        // associated references. This is done to prevent a memory leak.
+        this.error = options.error ?? null;
+        this.error?.stack;
+        // TODO(NODE-2674): Preserve int64 sent from MongoDB
+        this.topologyVersion = this.error?.topologyVersion ?? hello?.topologyVersion ?? null;
+        this.setName = hello?.setName ?? null;
+        this.setVersion = hello?.setVersion ?? null;
+        this.electionId = hello?.electionId ?? null;
+        this.logicalSessionTimeoutMinutes = hello?.logicalSessionTimeoutMinutes ?? null;
+        this.maxMessageSizeBytes = hello?.maxMessageSizeBytes ?? null;
+        this.maxWriteBatchSize = hello?.maxWriteBatchSize ?? null;
+        this.maxBsonObjectSize = hello?.maxBsonObjectSize ?? null;
+        this.primary = hello?.primary ?? null;
+        this.me = hello?.me?.toLowerCase() ?? null;
+        this.$clusterTime = hello?.$clusterTime ?? null;
+        this.iscryptd = Boolean(hello?.iscryptd);
+    }
+    get hostAddress() {
+        return utils_1.HostAddress.fromString(this.address);
+    }
+    get allHosts() {
+        return this.hosts.concat(this.arbiters).concat(this.passives);
+    }
+    /** Is this server available for reads*/
+    get isReadable() {
+        return this.type === common_1.ServerType.RSSecondary || this.isWritable;
+    }
+    /** Is this server data bearing */
+    get isDataBearing() {
+        return DATA_BEARING_SERVER_TYPES.has(this.type);
+    }
+    /** Is this server available for writes */
+    get isWritable() {
+        return WRITABLE_SERVER_TYPES.has(this.type);
+    }
+    get host() {
+        const chopLength = `:${this.port}`.length;
+        return this.address.slice(0, -chopLength);
+    }
+    get port() {
+        const port = this.address.split(':').pop();
+        return port ? Number.parseInt(port, 10) : 27017;
+    }
+    /**
+     * Determines if another `ServerDescription` is equal to this one per the rules defined in the SDAM specification.
+     * @see https://github.com/mongodb/specifications/blob/master/source/server-discovery-and-monitoring/server-discovery-and-monitoring.md
+     */
+    equals(other) {
+        // Despite using the comparator that would determine a nullish topologyVersion as greater than
+        // for equality we should only always perform direct equality comparison
+        const topologyVersionsEqual = this.topologyVersion === other?.topologyVersion ||
+            compareTopologyVersion(this.topologyVersion, other?.topologyVersion) === 0;
+        const electionIdsEqual = this.electionId != null && other?.electionId != null
+            ? (0, utils_1.compareObjectId)(this.electionId, other.electionId) === 0
+            : this.electionId === other?.electionId;
+        return (other != null &&
+            other.iscryptd === this.iscryptd &&
+            (0, utils_1.errorStrictEqual)(this.error, other.error) &&
+            this.type === other.type &&
+            this.minWireVersion === other.minWireVersion &&
+            (0, utils_1.arrayStrictEqual)(this.hosts, other.hosts) &&
+            tagsStrictEqual(this.tags, other.tags) &&
+            this.setName === other.setName &&
+            this.setVersion === other.setVersion &&
+            electionIdsEqual &&
+            this.primary === other.primary &&
+            this.logicalSessionTimeoutMinutes === other.logicalSessionTimeoutMinutes &&
+            topologyVersionsEqual);
+    }
+}
+exports.ServerDescription = ServerDescription;
+// Parses a `hello` message and determines the server type
+function parseServerType(hello, options) {
+    if (options?.loadBalanced) {
+        return common_1.ServerType.LoadBalancer;
+    }
+    if (!hello || !hello.ok) {
+        return common_1.ServerType.Unknown;
+    }
+    if (hello.isreplicaset) {
+        return common_1.ServerType.RSGhost;
+    }
+    if (hello.msg && hello.msg === 'isdbgrid') {
+        return common_1.ServerType.Mongos;
+    }
+    if (hello.setName) {
+        if (hello.hidden) {
+            return common_1.ServerType.RSOther;
+        }
+        else if (hello.isWritablePrimary) {
+            return common_1.ServerType.RSPrimary;
+        }
+        else if (hello.secondary) {
+            return common_1.ServerType.RSSecondary;
+        }
+        else if (hello.arbiterOnly) {
+            return common_1.ServerType.RSArbiter;
+        }
+        else {
+            return common_1.ServerType.RSOther;
+        }
+    }
+    return common_1.ServerType.Standalone;
+}
+function tagsStrictEqual(tags, tags2) {
+    const tagsKeys = Object.keys(tags);
+    const tags2Keys = Object.keys(tags2);
+    return (tagsKeys.length === tags2Keys.length &&
+        tagsKeys.every((key) => tags2[key] === tags[key]));
+}
+/**
+ * Compares two topology versions.
+ *
+ * 1. If the response topologyVersion is unset or the ServerDescription's
+ *    topologyVersion is null, the client MUST assume the response is more recent.
+ * 1. If the response's topologyVersion.processId is not equal to the
+ *    ServerDescription's, the client MUST assume the response is more recent.
+ * 1. If the response's topologyVersion.processId is equal to the
+ *    ServerDescription's, the client MUST use the counter field to determine
+ *    which topologyVersion is more recent.
+ *
+ * ```ts
+ * currentTv <   newTv === -1
+ * currentTv === newTv === 0
+ * currentTv >   newTv === 1
+ * ```
+ */
+function compareTopologyVersion(currentTv, newTv) {
+    if (currentTv == null || newTv == null) {
+        return -1;
+    }
+    if (!currentTv.processId.equals(newTv.processId)) {
+        return -1;
+    }
+    // TODO(NODE-2674): Preserve int64 sent from MongoDB
+    const currentCounter = typeof currentTv.counter === 'bigint'
+        ? bson_1.Long.fromBigInt(currentTv.counter)
+        : bson_1.Long.isLong(currentTv.counter)
+            ? currentTv.counter
+            : bson_1.Long.fromNumber(currentTv.counter);
+    const newCounter = typeof newTv.counter === 'bigint'
+        ? bson_1.Long.fromBigInt(newTv.counter)
+        : bson_1.Long.isLong(newTv.counter)
+            ? newTv.counter
+            : bson_1.Long.fromNumber(newTv.counter);
+    return currentCounter.compare(newCounter);
+}
+//# sourceMappingURL=server_description.js.map

node_modules/mongodb/lib/sdam/server_selection.js

@@ -0,0 +1,231 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.MIN_SECONDARY_WRITE_WIRE_VERSION = void 0;
+exports.writableServerSelector = writableServerSelector;
+exports.sameServerSelector = sameServerSelector;
+exports.secondaryWritableServerSelector = secondaryWritableServerSelector;
+exports.readPreferenceServerSelector = readPreferenceServerSelector;
+const error_1 = require("../error");
+const read_preference_1 = require("../read_preference");
+const common_1 = require("./common");
+// max staleness constants
+const IDLE_WRITE_PERIOD = 10000;
+const SMALLEST_MAX_STALENESS_SECONDS = 90;
+//  Minimum version to try writes on secondaries.
+exports.MIN_SECONDARY_WRITE_WIRE_VERSION = 13;
+/**
+ * Returns a server selector that selects for writable servers
+ */
+function writableServerSelector() {
+    return function writableServer(topologyDescription, servers) {
+        return latencyWindowReducer(topologyDescription, servers.filter((s) => s.isWritable));
+    };
+}
+/**
+ * The purpose of this selector is to select the same server, only
+ * if it is in a state that it can have commands sent to it.
+ */
+function sameServerSelector(description) {
+    return function sameServerSelector(topologyDescription, servers) {
+        if (!description)
+            return [];
+        // Filter the servers to match the provided description only if
+        // the type is not unknown.
+        return servers.filter(sd => {
+            return sd.address === description.address && sd.type !== common_1.ServerType.Unknown;
+        });
+    };
+}
+/**
+ * Returns a server selector that uses a read preference to select a
+ * server potentially for a write on a secondary.
+ */
+function secondaryWritableServerSelector(wireVersion, readPreference) {
+    // If server version < 5.0, read preference always primary.
+    // If server version >= 5.0...
+    // - If read preference is supplied, use that.
+    // - If no read preference is supplied, use primary.
+    if (!readPreference ||
+        !wireVersion ||
+        (wireVersion && wireVersion < exports.MIN_SECONDARY_WRITE_WIRE_VERSION)) {
+        return readPreferenceServerSelector(read_preference_1.ReadPreference.primary);
+    }
+    return readPreferenceServerSelector(readPreference);
+}
+/**
+ * Reduces the passed in array of servers by the rules of the "Max Staleness" specification
+ * found here:
+ *
+ * @see https://github.com/mongodb/specifications/blob/master/source/max-staleness/max-staleness.md
+ *
+ * @param readPreference - The read preference providing max staleness guidance
+ * @param topologyDescription - The topology description
+ * @param servers - The list of server descriptions to be reduced
+ * @returns The list of servers that satisfy the requirements of max staleness
+ */
+function maxStalenessReducer(readPreference, topologyDescription, servers) {
+    if (readPreference.maxStalenessSeconds == null || readPreference.maxStalenessSeconds < 0) {
+        return servers;
+    }
+    const maxStaleness = readPreference.maxStalenessSeconds;
+    const maxStalenessVariance = (topologyDescription.heartbeatFrequencyMS + IDLE_WRITE_PERIOD) / 1000;
+    if (maxStaleness < maxStalenessVariance) {
+        throw new error_1.MongoInvalidArgumentError(`Option "maxStalenessSeconds" must be at least ${maxStalenessVariance} seconds`);
+    }
+    if (maxStaleness < SMALLEST_MAX_STALENESS_SECONDS) {
+        throw new error_1.MongoInvalidArgumentError(`Option "maxStalenessSeconds" must be at least ${SMALLEST_MAX_STALENESS_SECONDS} seconds`);
+    }
+    if (topologyDescription.type === common_1.TopologyType.ReplicaSetWithPrimary) {
+        const primary = Array.from(topologyDescription.servers.values()).filter(primaryFilter)[0];
+        return servers.reduce((result, server) => {
+            const stalenessMS = server.lastUpdateTime -
+                server.lastWriteDate -
+                (primary.lastUpdateTime - primary.lastWriteDate) +
+                topologyDescription.heartbeatFrequencyMS;
+            const staleness = stalenessMS / 1000;
+            const maxStalenessSeconds = readPreference.maxStalenessSeconds ?? 0;
+            if (staleness <= maxStalenessSeconds) {
+                result.push(server);
+            }
+            return result;
+        }, []);
+    }
+    if (topologyDescription.type === common_1.TopologyType.ReplicaSetNoPrimary) {
+        if (servers.length === 0) {
+            return servers;
+        }
+        const sMax = servers.reduce((max, s) => s.lastWriteDate > max.lastWriteDate ? s : max);
+        return servers.reduce((result, server) => {
+            const stalenessMS = sMax.lastWriteDate - server.lastWriteDate + topologyDescription.heartbeatFrequencyMS;
+            const staleness = stalenessMS / 1000;
+            const maxStalenessSeconds = readPreference.maxStalenessSeconds ?? 0;
+            if (staleness <= maxStalenessSeconds) {
+                result.push(server);
+            }
+            return result;
+        }, []);
+    }
+    return servers;
+}
+/**
+ * Determines whether a server's tags match a given set of tags
+ *
+ * @param tagSet - The requested tag set to match
+ * @param serverTags - The server's tags
+ */
+function tagSetMatch(tagSet, serverTags) {
+    const keys = Object.keys(tagSet);
+    const serverTagKeys = Object.keys(serverTags);
+    for (let i = 0; i < keys.length; ++i) {
+        const key = keys[i];
+        if (serverTagKeys.indexOf(key) === -1 || serverTags[key] !== tagSet[key]) {
+            return false;
+        }
+    }
+    return true;
+}
+/**
+ * Reduces a set of server descriptions based on tags requested by the read preference
+ *
+ * @param readPreference - The read preference providing the requested tags
+ * @param servers - The list of server descriptions to reduce
+ * @returns The list of servers matching the requested tags
+ */
+function tagSetReducer(readPreference, servers) {
+    if (readPreference.tags == null ||
+        (Array.isArray(readPreference.tags) && readPreference.tags.length === 0)) {
+        return servers;
+    }
+    for (let i = 0; i < readPreference.tags.length; ++i) {
+        const tagSet = readPreference.tags[i];
+        const serversMatchingTagset = servers.reduce((matched, server) => {
+            if (tagSetMatch(tagSet, server.tags))
+                matched.push(server);
+            return matched;
+        }, []);
+        if (serversMatchingTagset.length) {
+            return serversMatchingTagset;
+        }
+    }
+    return [];
+}
+/**
+ * Reduces a list of servers to ensure they fall within an acceptable latency window. This is
+ * further specified in the "Server Selection" specification, found here:
+ *
+ * @see https://github.com/mongodb/specifications/blob/master/source/server-selection/server-selection.md
+ *
+ * @param topologyDescription - The topology description
+ * @param servers - The list of servers to reduce
+ * @returns The servers which fall within an acceptable latency window
+ */
+function latencyWindowReducer(topologyDescription, servers) {
+    const low = servers.reduce((min, server) => Math.min(server.roundTripTime, min), Infinity);
+    const high = low + topologyDescription.localThresholdMS;
+    return servers.reduce((result, server) => {
+        if (server.roundTripTime <= high && server.roundTripTime >= low)
+            result.push(server);
+        return result;
+    }, []);
+}
+// filters
+function primaryFilter(server) {
+    return server.type === common_1.ServerType.RSPrimary;
+}
+function secondaryFilter(server) {
+    return server.type === common_1.ServerType.RSSecondary;
+}
+function nearestFilter(server) {
+    return server.type === common_1.ServerType.RSSecondary || server.type === common_1.ServerType.RSPrimary;
+}
+function knownFilter(server) {
+    return server.type !== common_1.ServerType.Unknown;
+}
+function loadBalancerFilter(server) {
+    return server.type === common_1.ServerType.LoadBalancer;
+}
+/**
+ * Returns a function which selects servers based on a provided read preference
+ *
+ * @param readPreference - The read preference to select with
+ */
+function readPreferenceServerSelector(readPreference) {
+    if (!readPreference.isValid()) {
+        throw new error_1.MongoInvalidArgumentError('Invalid read preference specified');
+    }
+    return function readPreferenceServers(topologyDescription, servers, deprioritized = []) {
+        if (topologyDescription.type === common_1.TopologyType.LoadBalanced) {
+            return servers.filter(loadBalancerFilter);
+        }
+        if (topologyDescription.type === common_1.TopologyType.Unknown) {
+            return [];
+        }
+        if (topologyDescription.type === common_1.TopologyType.Single) {
+            return latencyWindowReducer(topologyDescription, servers.filter(knownFilter));
+        }
+        if (topologyDescription.type === common_1.TopologyType.Sharded) {
+            const filtered = servers.filter(server => {
+                return !deprioritized.includes(server);
+            });
+            const selectable = filtered.length > 0 ? filtered : deprioritized;
+            return latencyWindowReducer(topologyDescription, selectable.filter(knownFilter));
+        }
+        const mode = readPreference.mode;
+        if (mode === read_preference_1.ReadPreference.PRIMARY) {
+            return servers.filter(primaryFilter);
+        }
+        if (mode === read_preference_1.ReadPreference.PRIMARY_PREFERRED) {
+            const result = servers.filter(primaryFilter);
+            if (result.length) {
+                return result;
+            }
+        }
+        const filter = mode === read_preference_1.ReadPreference.NEAREST ? nearestFilter : secondaryFilter;
+        const selectedServers = latencyWindowReducer(topologyDescription, tagSetReducer(readPreference, maxStalenessReducer(readPreference, topologyDescription, servers.filter(filter))));
+        if (mode === read_preference_1.ReadPreference.SECONDARY_PREFERRED && selectedServers.length === 0) {
+            return servers.filter(primaryFilter);
+        }
+        return selectedServers;
+    };
+}
+//# sourceMappingURL=server_selection.js.map

node_modules/mongodb/lib/sdam/server_selection_events.js

@@ -0,0 +1,85 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.WaitingForSuitableServerEvent = exports.ServerSelectionSucceededEvent = exports.ServerSelectionFailedEvent = exports.ServerSelectionStartedEvent = exports.ServerSelectionEvent = void 0;
+const utils_1 = require(".././utils");
+const constants_1 = require("../constants");
+/**
+ * The base export class for all logs published from server selection
+ * @internal
+ * @category Log Type
+ */
+class ServerSelectionEvent {
+    /** @internal */
+    constructor(selector, topologyDescription, operation) {
+        this.selector = selector;
+        this.operation = operation;
+        this.topologyDescription = topologyDescription;
+    }
+}
+exports.ServerSelectionEvent = ServerSelectionEvent;
+/**
+ * An event published when server selection starts
+ * @internal
+ * @category Event
+ */
+class ServerSelectionStartedEvent extends ServerSelectionEvent {
+    /** @internal */
+    constructor(selector, topologyDescription, operation) {
+        super(selector, topologyDescription, operation);
+        /** @internal */
+        this.name = constants_1.SERVER_SELECTION_STARTED;
+        this.message = 'Server selection started';
+    }
+}
+exports.ServerSelectionStartedEvent = ServerSelectionStartedEvent;
+/**
+ * An event published when a server selection fails
+ * @internal
+ * @category Event
+ */
+class ServerSelectionFailedEvent extends ServerSelectionEvent {
+    /** @internal */
+    constructor(selector, topologyDescription, error, operation) {
+        super(selector, topologyDescription, operation);
+        /** @internal */
+        this.name = constants_1.SERVER_SELECTION_FAILED;
+        this.message = 'Server selection failed';
+        this.failure = error;
+    }
+}
+exports.ServerSelectionFailedEvent = ServerSelectionFailedEvent;
+/**
+ * An event published when server selection succeeds
+ * @internal
+ * @category Event
+ */
+class ServerSelectionSucceededEvent extends ServerSelectionEvent {
+    /** @internal */
+    constructor(selector, topologyDescription, address, operation) {
+        super(selector, topologyDescription, operation);
+        /** @internal */
+        this.name = constants_1.SERVER_SELECTION_SUCCEEDED;
+        this.message = 'Server selection succeeded';
+        const { host, port } = utils_1.HostAddress.fromString(address).toHostPort();
+        this.serverHost = host;
+        this.serverPort = port;
+    }
+}
+exports.ServerSelectionSucceededEvent = ServerSelectionSucceededEvent;
+/**
+ * An event published when server selection is waiting for a suitable server to become available
+ * @internal
+ * @category Event
+ */
+class WaitingForSuitableServerEvent extends ServerSelectionEvent {
+    /** @internal */
+    constructor(selector, topologyDescription, remainingTimeMS, operation) {
+        super(selector, topologyDescription, operation);
+        /** @internal */
+        this.name = constants_1.WAITING_FOR_SUITABLE_SERVER;
+        this.message = 'Waiting for suitable server to become available';
+        this.remainingTimeMS = remainingTimeMS;
+    }
+}
+exports.WaitingForSuitableServerEvent = WaitingForSuitableServerEvent;
+//# sourceMappingURL=server_selection_events.js.map

node_modules/mongodb/lib/sdam/server_selection_events.js.map

@@ -0,0 +1 @@
+{"version":3,"file":"server_selection_events.js","sourceRoot":"","sources":["../../src/sdam/server_selection_events.ts"],"names":[],"mappings":";;;AAAA,sCAAyC;AACzC,4CAKsB;AAKtB;;;;GAIG;AACH,MAAsB,oBAAoB;IAmBxC,gBAAgB;IAChB,YACE,QAAkD,EAClD,mBAAwC,EACxC,SAAiB;QAEjB,IAAI,CAAC,QAAQ,GAAG,QAAQ,CAAC;QACzB,IAAI,CAAC,SAAS,GAAG,SAAS,CAAC;QAC3B,IAAI,CAAC,mBAAmB,GAAG,mBAAmB,CAAC;IACjD,CAAC;CACF;AA7BD,oDA6BC;AAED;;;;GAIG;AACH,MAAa,2BAA4B,SAAQ,oBAAoB;IAKnE,gBAAgB;IAChB,YACE,QAAkD,EAClD,mBAAwC,EACxC,SAAiB;QAEjB,KAAK,CAAC,QAAQ,EAAE,mBAAmB,EAAE,SAAS,CAAC,CAAC;QAVlD,gBAAgB;QAChB,SAAI,GAAG,oCAAwB,CAAC;QAChC,YAAO,GAAG,0BAA0B,CAAC;IASrC,CAAC;CACF;AAbD,kEAaC;AAED;;;;GAIG;AACH,MAAa,0BAA2B,SAAQ,oBAAoB;IAOlE,gBAAgB;IAChB,YACE,QAAkD,EAClD,mBAAwC,EACxC,KAAY,EACZ,SAAiB;QAEjB,KAAK,CAAC,QAAQ,EAAE,mBAAmB,EAAE,SAAS,CAAC,CAAC;QAblD,gBAAgB;QAChB,SAAI,GAAG,mCAAuB,CAAC;QAC/B,YAAO,GAAG,yBAAyB,CAAC;QAYlC,IAAI,CAAC,OAAO,GAAG,KAAK,CAAC;IACvB,CAAC;CACF;AAjBD,gEAiBC;AAED;;;;GAIG;AACH,MAAa,6BAA8B,SAAQ,oBAAoB;IASrE,gBAAgB;IAChB,YACE,QAAkD,EAClD,mBAAwC,EACxC,OAAe,EACf,SAAiB;QAEjB,KAAK,CAAC,QAAQ,EAAE,mBAAmB,EAAE,SAAS,CAAC,CAAC;QAflD,gBAAgB;QAChB,SAAI,GAAG,sCAA0B,CAAC;QAClC,YAAO,GAAG,4BAA4B,CAAC;QAcrC,MAAM,EAAE,IAAI,EAAE,IAAI,EAAE,GAAG,mBAAW,CAAC,UAAU,CAAC,OAAO,CAAC,CAAC,UAAU,EAAE,CAAC;QACpE,IAAI,CAAC,UAAU,GAAG,IAAI,CAAC;QACvB,IAAI,CAAC,UAAU,GAAG,IAAI,CAAC;IACzB,CAAC;CACF;AArBD,sEAqBC;AAED;;;;GAIG;AACH,MAAa,6BAA8B,SAAQ,oBAAoB;IAOrE,gBAAgB;IAChB,YACE,QAAkD,EAClD,mBAAwC,EACxC,eAAuB,EACvB,SAAiB;QAEjB,KAAK,CAAC,QAAQ,EAAE,mBAAmB,EAAE,SAAS,CAAC,CAAC;QAblD,gBAAgB;QAChB,SAAI,GAAG,uCAA2B,CAAC;QACnC,YAAO,GAAG,iDAAiD,CAAC;QAY1D,IAAI,CAAC,eAAe,GAAG,eAAe,CAAC;IACzC,CAAC;CACF;AAjBD,sEAiBC"}

node_modules/mongodb/lib/sdam/srv_polling.js

@@ -0,0 +1,108 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.SrvPoller = exports.SrvPollingEvent = void 0;
+const dns = require("dns");
+const timers_1 = require("timers");
+const error_1 = require("../error");
+const mongo_types_1 = require("../mongo_types");
+const utils_1 = require("../utils");
+/**
+ * @internal
+ * @category Event
+ */
+class SrvPollingEvent {
+    constructor(srvRecords) {
+        this.srvRecords = srvRecords;
+    }
+    hostnames() {
+        return new Set(this.srvRecords.map(r => utils_1.HostAddress.fromSrvRecord(r).toString()));
+    }
+}
+exports.SrvPollingEvent = SrvPollingEvent;
+/** @internal */
+class SrvPoller extends mongo_types_1.TypedEventEmitter {
+    /** @event */
+    static { this.SRV_RECORD_DISCOVERY = 'srvRecordDiscovery'; }
+    constructor(options) {
+        super();
+        this.on('error', utils_1.noop);
+        if (!options || !options.srvHost) {
+            throw new error_1.MongoRuntimeError('Options for SrvPoller must exist and include srvHost');
+        }
+        this.srvHost = options.srvHost;
+        this.srvMaxHosts = options.srvMaxHosts ?? 0;
+        this.srvServiceName = options.srvServiceName ?? 'mongodb';
+        this.rescanSrvIntervalMS = 60000;
+        this.heartbeatFrequencyMS = options.heartbeatFrequencyMS ?? 10000;
+        this.haMode = false;
+        this.generation = 0;
+        this._timeout = undefined;
+    }
+    get srvAddress() {
+        return `_${this.srvServiceName}._tcp.${this.srvHost}`;
+    }
+    get intervalMS() {
+        return this.haMode ? this.heartbeatFrequencyMS : this.rescanSrvIntervalMS;
+    }
+    start() {
+        if (!this._timeout) {
+            this.schedule();
+        }
+    }
+    stop() {
+        if (this._timeout) {
+            (0, timers_1.clearTimeout)(this._timeout);
+            this.generation += 1;
+            this._timeout = undefined;
+        }
+    }
+    // TODO(NODE-4994): implement new logging logic for SrvPoller failures
+    schedule() {
+        if (this._timeout) {
+            (0, timers_1.clearTimeout)(this._timeout);
+        }
+        this._timeout = (0, timers_1.setTimeout)(() => {
+            this._poll().then(undefined, utils_1.squashError);
+        }, this.intervalMS);
+    }
+    success(srvRecords) {
+        this.haMode = false;
+        this.schedule();
+        this.emit(SrvPoller.SRV_RECORD_DISCOVERY, new SrvPollingEvent(srvRecords));
+    }
+    failure() {
+        this.haMode = true;
+        this.schedule();
+    }
+    async _poll() {
+        const generation = this.generation;
+        let srvRecords;
+        try {
+            srvRecords = await dns.promises.resolveSrv(this.srvAddress);
+        }
+        catch {
+            this.failure();
+            return;
+        }
+        if (generation !== this.generation) {
+            return;
+        }
+        const finalAddresses = [];
+        for (const record of srvRecords) {
+            try {
+                (0, utils_1.checkParentDomainMatch)(record.name, this.srvHost);
+                finalAddresses.push(record);
+            }
+            catch (error) {
+                (0, utils_1.squashError)(error);
+            }
+        }
+        if (!finalAddresses.length) {
+            this.failure();
+            return;
+        }
+        this.success(finalAddresses);
+    }
+}
+exports.SrvPoller = SrvPoller;
+//# sourceMappingURL=srv_polling.js.map

node_modules/mongodb/lib/sdam/srv_polling.js.map

@@ -0,0 +1 @@
+{"version":3,"file":"srv_polling.js","sourceRoot":"","sources":["../../src/sdam/srv_polling.ts"],"names":[],"mappings":";;;AAAA,2BAA2B;AAC3B,mCAAkD;AAElD,oCAA6C;AAC7C,gDAAmD;AACnD,oCAAkF;AAElF;;;GAGG;AACH,MAAa,eAAe;IAE1B,YAAY,UAA2B;QACrC,IAAI,CAAC,UAAU,GAAG,UAAU,CAAC;IAC/B,CAAC;IAED,SAAS;QACP,OAAO,IAAI,GAAG,CAAC,IAAI,CAAC,UAAU,CAAC,GAAG,CAAC,CAAC,CAAC,EAAE,CAAC,mBAAW,CAAC,aAAa,CAAC,CAAC,CAAC,CAAC,QAAQ,EAAE,CAAC,CAAC,CAAC;IACpF,CAAC;CACF;AATD,0CASC;AAeD,gBAAgB;AAChB,MAAa,SAAU,SAAQ,+BAAkC;IAU/D,aAAa;aACG,yBAAoB,GAAG,oBAA6B,CAAC;IAErE,YAAY,OAAyB;QACnC,KAAK,EAAE,CAAC;QACR,IAAI,CAAC,EAAE,CAAC,OAAO,EAAE,YAAI,CAAC,CAAC;QAEvB,IAAI,CAAC,OAAO,IAAI,CAAC,OAAO,CAAC,OAAO,EAAE,CAAC;YACjC,MAAM,IAAI,yBAAiB,CAAC,sDAAsD,CAAC,CAAC;QACtF,CAAC;QAED,IAAI,CAAC,OAAO,GAAG,OAAO,CAAC,OAAO,CAAC;QAC/B,IAAI,CAAC,WAAW,GAAG,OAAO,CAAC,WAAW,IAAI,CAAC,CAAC;QAC5C,IAAI,CAAC,cAAc,GAAG,OAAO,CAAC,cAAc,IAAI,SAAS,CAAC;QAC1D,IAAI,CAAC,mBAAmB,GAAG,KAAK,CAAC;QACjC,IAAI,CAAC,oBAAoB,GAAG,OAAO,CAAC,oBAAoB,IAAI,KAAK,CAAC;QAElE,IAAI,CAAC,MAAM,GAAG,KAAK,CAAC;QACpB,IAAI,CAAC,UAAU,GAAG,CAAC,CAAC;QAEpB,IAAI,CAAC,QAAQ,GAAG,SAAS,CAAC;IAC5B,CAAC;IAED,IAAI,UAAU;QACZ,OAAO,IAAI,IAAI,CAAC,cAAc,SAAS,IAAI,CAAC,OAAO,EAAE,CAAC;IACxD,CAAC;IAED,IAAI,UAAU;QACZ,OAAO,IAAI,CAAC,MAAM,CAAC,CAAC,CAAC,IAAI,CAAC,oBAAoB,CAAC,CAAC,CAAC,IAAI,CAAC,mBAAmB,CAAC;IAC5E,CAAC;IAED,KAAK;QACH,IAAI,CAAC,IAAI,CAAC,QAAQ,EAAE,CAAC;YACnB,IAAI,CAAC,QAAQ,EAAE,CAAC;QAClB,CAAC;IACH,CAAC;IAED,IAAI;QACF,IAAI,IAAI,CAAC,QAAQ,EAAE,CAAC;YAClB,IAAA,qBAAY,EAAC,IAAI,CAAC,QAAQ,CAAC,CAAC;YAC5B,IAAI,CAAC,UAAU,IAAI,CAAC,CAAC;YACrB,IAAI,CAAC,QAAQ,GAAG,SAAS,CAAC;QAC5B,CAAC;IACH,CAAC;IAED,sEAAsE;IACtE,QAAQ;QACN,IAAI,IAAI,CAAC,QAAQ,EAAE,CAAC;YAClB,IAAA,qBAAY,EAAC,IAAI,CAAC,QAAQ,CAAC,CAAC;QAC9B,CAAC;QAED,IAAI,CAAC,QAAQ,GAAG,IAAA,mBAAU,EAAC,GAAG,EAAE;YAC9B,IAAI,CAAC,KAAK,EAAE,CAAC,IAAI,CAAC,SAAS,EAAE,mBAAW,CAAC,CAAC;QAC5C,CAAC,EAAE,IAAI,CAAC,UAAU,CAAC,CAAC;IACtB,CAAC;IAED,OAAO,CAAC,UAA2B;QACjC,IAAI,CAAC,MAAM,GAAG,KAAK,CAAC;QACpB,IAAI,CAAC,QAAQ,EAAE,CAAC;QAChB,IAAI,CAAC,IAAI,CAAC,SAAS,CAAC,oBAAoB,EAAE,IAAI,eAAe,CAAC,UAAU,CAAC,CAAC,CAAC;IAC7E,CAAC;IAED,OAAO;QACL,IAAI,CAAC,MAAM,GAAG,IAAI,CAAC;QACnB,IAAI,CAAC,QAAQ,EAAE,CAAC;IAClB,CAAC;IAED,KAAK,CAAC,KAAK;QACT,MAAM,UAAU,GAAG,IAAI,CAAC,UAAU,CAAC;QACnC,IAAI,UAAU,CAAC;QAEf,IAAI,CAAC;YACH,UAAU,GAAG,MAAM,GAAG,CAAC,QAAQ,CAAC,UAAU,CAAC,IAAI,CAAC,UAAU,CAAC,CAAC;QAC9D,CAAC;QAAC,MAAM,CAAC;YACP,IAAI,CAAC,OAAO,EAAE,CAAC;YACf,OAAO;QACT,CAAC;QAED,IAAI,UAAU,KAAK,IAAI,CAAC,UAAU,EAAE,CAAC;YACnC,OAAO;QACT,CAAC;QAED,MAAM,cAAc,GAAoB,EAAE,CAAC;QAC3C,KAAK,MAAM,MAAM,IAAI,UAAU,EAAE,CAAC;YAChC,IAAI,CAAC;gBACH,IAAA,8BAAsB,EAAC,MAAM,CAAC,IAAI,EAAE,IAAI,CAAC,OAAO,CAAC,CAAC;gBAClD,cAAc,CAAC,IAAI,CAAC,MAAM,CAAC,CAAC;YAC9B,CAAC;YAAC,OAAO,KAAK,EAAE,CAAC;gBACf,IAAA,mBAAW,EAAC,KAAK,CAAC,CAAC;YACrB,CAAC;QACH,CAAC;QAED,IAAI,CAAC,cAAc,CAAC,MAAM,EAAE,CAAC;YAC3B,IAAI,CAAC,OAAO,EAAE,CAAC;YACf,OAAO;QACT,CAAC;QAED,IAAI,CAAC,OAAO,CAAC,cAAc,CAAC,CAAC;IAC/B,CAAC;;AA5GH,8BA6GC"}

node_modules/mongodb/lib/sdam/topology.js

@@ -0,0 +1,650 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.Topology = void 0;
+const connection_string_1 = require("../connection_string");
+const constants_1 = require("../constants");
+const error_1 = require("../error");
+const mongo_logger_1 = require("../mongo_logger");
+const mongo_types_1 = require("../mongo_types");
+const read_preference_1 = require("../read_preference");
+const timeout_1 = require("../timeout");
+const utils_1 = require("../utils");
+const common_1 = require("./common");
+const events_1 = require("./events");
+const server_1 = require("./server");
+const server_description_1 = require("./server_description");
+const server_selection_1 = require("./server_selection");
+const server_selection_events_1 = require("./server_selection_events");
+const srv_polling_1 = require("./srv_polling");
+const topology_description_1 = require("./topology_description");
+// Global state
+let globalTopologyCounter = 0;
+const stateTransition = (0, utils_1.makeStateMachine)({
+    [common_1.STATE_CLOSED]: [common_1.STATE_CLOSED, common_1.STATE_CONNECTING],
+    [common_1.STATE_CONNECTING]: [common_1.STATE_CONNECTING, common_1.STATE_CLOSING, common_1.STATE_CONNECTED, common_1.STATE_CLOSED],
+    [common_1.STATE_CONNECTED]: [common_1.STATE_CONNECTED, common_1.STATE_CLOSING, common_1.STATE_CLOSED],
+    [common_1.STATE_CLOSING]: [common_1.STATE_CLOSING, common_1.STATE_CLOSED]
+});
+/**
+ * A container of server instances representing a connection to a MongoDB topology.
+ * @internal
+ */
+class Topology extends mongo_types_1.TypedEventEmitter {
+    /** @event */
+    static { this.SERVER_OPENING = constants_1.SERVER_OPENING; }
+    /** @event */
+    static { this.SERVER_CLOSED = constants_1.SERVER_CLOSED; }
+    /** @event */
+    static { this.SERVER_DESCRIPTION_CHANGED = constants_1.SERVER_DESCRIPTION_CHANGED; }
+    /** @event */
+    static { this.TOPOLOGY_OPENING = constants_1.TOPOLOGY_OPENING; }
+    /** @event */
+    static { this.TOPOLOGY_CLOSED = constants_1.TOPOLOGY_CLOSED; }
+    /** @event */
+    static { this.TOPOLOGY_DESCRIPTION_CHANGED = constants_1.TOPOLOGY_DESCRIPTION_CHANGED; }
+    /** @event */
+    static { this.ERROR = constants_1.ERROR; }
+    /** @event */
+    static { this.OPEN = constants_1.OPEN; }
+    /** @event */
+    static { this.CONNECT = constants_1.CONNECT; }
+    /** @event */
+    static { this.CLOSE = constants_1.CLOSE; }
+    /** @event */
+    static { this.TIMEOUT = constants_1.TIMEOUT; }
+    /**
+     * @param seedlist - a list of HostAddress instances to connect to
+     */
+    constructor(client, seeds, options) {
+        super();
+        this.on('error', utils_1.noop);
+        this.client = client;
+        // Options should only be undefined in tests, MongoClient will always have defined options
+        options = options ?? {
+            hosts: [utils_1.HostAddress.fromString('localhost:27017')],
+            ...Object.fromEntries(connection_string_1.DEFAULT_OPTIONS.entries())
+        };
+        if (typeof seeds === 'string') {
+            seeds = [utils_1.HostAddress.fromString(seeds)];
+        }
+        else if (!Array.isArray(seeds)) {
+            seeds = [seeds];
+        }
+        const seedlist = [];
+        for (const seed of seeds) {
+            if (typeof seed === 'string') {
+                seedlist.push(utils_1.HostAddress.fromString(seed));
+            }
+            else if (seed instanceof utils_1.HostAddress) {
+                seedlist.push(seed);
+            }
+            else {
+                // FIXME(NODE-3483): May need to be a MongoParseError
+                throw new error_1.MongoRuntimeError(`Topology cannot be constructed from ${JSON.stringify(seed)}`);
+            }
+        }
+        const topologyType = topologyTypeFromOptions(options);
+        const topologyId = globalTopologyCounter++;
+        const selectedHosts = options.srvMaxHosts == null ||
+            options.srvMaxHosts === 0 ||
+            options.srvMaxHosts >= seedlist.length
+            ? seedlist
+            : (0, utils_1.shuffle)(seedlist, options.srvMaxHosts);
+        const serverDescriptions = new Map();
+        for (const hostAddress of selectedHosts) {
+            serverDescriptions.set(hostAddress.toString(), new server_description_1.ServerDescription(hostAddress));
+        }
+        this.waitQueue = new utils_1.List();
+        this.s = {
+            // the id of this topology
+            id: topologyId,
+            // passed in options
+            options,
+            // initial seedlist of servers to connect to
+            seedlist,
+            // initial state
+            state: common_1.STATE_CLOSED,
+            // the topology description
+            description: new topology_description_1.TopologyDescription(topologyType, serverDescriptions, options.replicaSet, undefined, undefined, undefined, options),
+            serverSelectionTimeoutMS: options.serverSelectionTimeoutMS,
+            heartbeatFrequencyMS: options.heartbeatFrequencyMS,
+            minHeartbeatFrequencyMS: options.minHeartbeatFrequencyMS,
+            // a map of server instances to normalized addresses
+            servers: new Map(),
+            credentials: options?.credentials,
+            clusterTime: undefined,
+            detectShardedTopology: ev => this.detectShardedTopology(ev),
+            detectSrvRecords: ev => this.detectSrvRecords(ev)
+        };
+        this.mongoLogger = client.mongoLogger;
+        this.component = 'topology';
+        if (options.srvHost && !options.loadBalanced) {
+            this.s.srvPoller =
+                options.srvPoller ??
+                    new srv_polling_1.SrvPoller({
+                        heartbeatFrequencyMS: this.s.heartbeatFrequencyMS,
+                        srvHost: options.srvHost,
+                        srvMaxHosts: options.srvMaxHosts,
+                        srvServiceName: options.srvServiceName
+                    });
+            this.on(Topology.TOPOLOGY_DESCRIPTION_CHANGED, this.s.detectShardedTopology);
+        }
+        this.connectionLock = undefined;
+    }
+    detectShardedTopology(event) {
+        const previousType = event.previousDescription.type;
+        const newType = event.newDescription.type;
+        const transitionToSharded = previousType !== common_1.TopologyType.Sharded && newType === common_1.TopologyType.Sharded;
+        const srvListeners = this.s.srvPoller?.listeners(srv_polling_1.SrvPoller.SRV_RECORD_DISCOVERY);
+        const listeningToSrvPolling = !!srvListeners?.includes(this.s.detectSrvRecords);
+        if (transitionToSharded && !listeningToSrvPolling) {
+            this.s.srvPoller?.on(srv_polling_1.SrvPoller.SRV_RECORD_DISCOVERY, this.s.detectSrvRecords);
+            this.s.srvPoller?.start();
+        }
+    }
+    detectSrvRecords(ev) {
+        const previousTopologyDescription = this.s.description;
+        this.s.description = this.s.description.updateFromSrvPollingEvent(ev, this.s.options.srvMaxHosts);
+        if (this.s.description === previousTopologyDescription) {
+            // Nothing changed, so return
+            return;
+        }
+        updateServers(this);
+        this.emitAndLog(Topology.TOPOLOGY_DESCRIPTION_CHANGED, new events_1.TopologyDescriptionChangedEvent(this.s.id, previousTopologyDescription, this.s.description));
+    }
+    /**
+     * @returns A `TopologyDescription` for this topology
+     */
+    get description() {
+        return this.s.description;
+    }
+    get loadBalanced() {
+        return this.s.options.loadBalanced;
+    }
+    get serverApi() {
+        return this.s.options.serverApi;
+    }
+    /** Initiate server connect */
+    async connect(options) {
+        this.connectionLock ??= this._connect(options);
+        try {
+            await this.connectionLock;
+            return this;
+        }
+        finally {
+            this.connectionLock = undefined;
+        }
+    }
+    async _connect(options) {
+        options = options ?? {};
+        if (this.s.state === common_1.STATE_CONNECTED) {
+            return this;
+        }
+        stateTransition(this, common_1.STATE_CONNECTING);
+        // emit SDAM monitoring events
+        this.emitAndLog(Topology.TOPOLOGY_OPENING, new events_1.TopologyOpeningEvent(this.s.id));
+        // emit an event for the topology change
+        this.emitAndLog(Topology.TOPOLOGY_DESCRIPTION_CHANGED, new events_1.TopologyDescriptionChangedEvent(this.s.id, new topology_description_1.TopologyDescription(common_1.TopologyType.Unknown), // initial is always Unknown
+        this.s.description));
+        // connect all known servers, then attempt server selection to connect
+        const serverDescriptions = Array.from(this.s.description.servers.values());
+        this.s.servers = new Map(serverDescriptions.map(serverDescription => [
+            serverDescription.address,
+            createAndConnectServer(this, serverDescription)
+        ]));
+        // In load balancer mode we need to fake a server description getting
+        // emitted from the monitor, since the monitor doesn't exist.
+        if (this.s.options.loadBalanced) {
+            for (const description of serverDescriptions) {
+                const newDescription = new server_description_1.ServerDescription(description.hostAddress, undefined, {
+                    loadBalanced: this.s.options.loadBalanced
+                });
+                this.serverUpdateHandler(newDescription);
+            }
+        }
+        const serverSelectionTimeoutMS = this.client.s.options.serverSelectionTimeoutMS;
+        const readPreference = options.readPreference ?? read_preference_1.ReadPreference.primary;
+        const timeoutContext = timeout_1.TimeoutContext.create({
+            // TODO(NODE-6448): auto-connect ignores timeoutMS; potential future feature
+            timeoutMS: undefined,
+            serverSelectionTimeoutMS,
+            waitQueueTimeoutMS: this.client.s.options.waitQueueTimeoutMS
+        });
+        const selectServerOptions = {
+            operationName: 'handshake',
+            ...options,
+            timeoutContext
+        };
+        try {
+            const server = await this.selectServer((0, server_selection_1.readPreferenceServerSelector)(readPreference), selectServerOptions);
+            const skipPingOnConnect = this.s.options.__skipPingOnConnect === true;
+            if (!skipPingOnConnect) {
+                const connection = await server.pool.checkOut({ timeoutContext: timeoutContext });
+                server.pool.checkIn(connection);
+                stateTransition(this, common_1.STATE_CONNECTED);
+                this.emit(Topology.OPEN, this);
+                this.emit(Topology.CONNECT, this);
+                return this;
+            }
+            stateTransition(this, common_1.STATE_CONNECTED);
+            this.emit(Topology.OPEN, this);
+            this.emit(Topology.CONNECT, this);
+            return this;
+        }
+        catch (error) {
+            this.close();
+            throw error;
+        }
+    }
+    closeCheckedOutConnections() {
+        for (const server of this.s.servers.values()) {
+            return server.closeCheckedOutConnections();
+        }
+    }
+    /** Close this topology */
+    close() {
+        if (this.s.state === common_1.STATE_CLOSED || this.s.state === common_1.STATE_CLOSING) {
+            return;
+        }
+        for (const server of this.s.servers.values()) {
+            closeServer(server, this);
+        }
+        this.s.servers.clear();
+        stateTransition(this, common_1.STATE_CLOSING);
+        drainWaitQueue(this.waitQueue, new error_1.MongoTopologyClosedError());
+        if (this.s.srvPoller) {
+            this.s.srvPoller.stop();
+            this.s.srvPoller.removeListener(srv_polling_1.SrvPoller.SRV_RECORD_DISCOVERY, this.s.detectSrvRecords);
+        }
+        this.removeListener(Topology.TOPOLOGY_DESCRIPTION_CHANGED, this.s.detectShardedTopology);
+        stateTransition(this, common_1.STATE_CLOSED);
+        // emit an event for close
+        this.emitAndLog(Topology.TOPOLOGY_CLOSED, new events_1.TopologyClosedEvent(this.s.id));
+    }
+    /**
+     * Selects a server according to the selection predicate provided
+     *
+     * @param selector - An optional selector to select servers by, defaults to a random selection within a latency window
+     * @param options - Optional settings related to server selection
+     * @param callback - The callback used to indicate success or failure
+     * @returns An instance of a `Server` meeting the criteria of the predicate provided
+     */
+    async selectServer(selector, options) {
+        let serverSelector;
+        if (typeof selector !== 'function') {
+            if (typeof selector === 'string') {
+                serverSelector = (0, server_selection_1.readPreferenceServerSelector)(read_preference_1.ReadPreference.fromString(selector));
+            }
+            else {
+                let readPreference;
+                if (selector instanceof read_preference_1.ReadPreference) {
+                    readPreference = selector;
+                }
+                else {
+                    read_preference_1.ReadPreference.translate(options);
+                    readPreference = options.readPreference || read_preference_1.ReadPreference.primary;
+                }
+                serverSelector = (0, server_selection_1.readPreferenceServerSelector)(readPreference);
+            }
+        }
+        else {
+            serverSelector = selector;
+        }
+        options = { serverSelectionTimeoutMS: this.s.serverSelectionTimeoutMS, ...options };
+        if (this.client.mongoLogger?.willLog(mongo_logger_1.MongoLoggableComponent.SERVER_SELECTION, mongo_logger_1.SeverityLevel.DEBUG)) {
+            this.client.mongoLogger?.debug(mongo_logger_1.MongoLoggableComponent.SERVER_SELECTION, new server_selection_events_1.ServerSelectionStartedEvent(selector, this.description, options.operationName));
+        }
+        let timeout;
+        if (options.timeoutContext)
+            timeout = options.timeoutContext.serverSelectionTimeout;
+        else {
+            timeout = timeout_1.Timeout.expires(options.serverSelectionTimeoutMS ?? 0);
+        }
+        const isSharded = this.description.type === common_1.TopologyType.Sharded;
+        const session = options.session;
+        const transaction = session && session.transaction;
+        if (isSharded && transaction && transaction.server) {
+            if (this.client.mongoLogger?.willLog(mongo_logger_1.MongoLoggableComponent.SERVER_SELECTION, mongo_logger_1.SeverityLevel.DEBUG)) {
+                this.client.mongoLogger?.debug(mongo_logger_1.MongoLoggableComponent.SERVER_SELECTION, new server_selection_events_1.ServerSelectionSucceededEvent(selector, this.description, transaction.server.pool.address, options.operationName));
+            }
+            if (options.timeoutContext?.clearServerSelectionTimeout)
+                timeout?.clear();
+            return transaction.server;
+        }
+        const { promise: serverPromise, resolve, reject } = (0, utils_1.promiseWithResolvers)();
+        const waitQueueMember = {
+            serverSelector,
+            topologyDescription: this.description,
+            mongoLogger: this.client.mongoLogger,
+            transaction,
+            resolve,
+            reject,
+            cancelled: false,
+            startTime: (0, utils_1.now)(),
+            operationName: options.operationName,
+            waitingLogged: false,
+            previousServer: options.previousServer
+        };
+        const abortListener = (0, utils_1.addAbortListener)(options.signal, function () {
+            waitQueueMember.cancelled = true;
+            reject(this.reason);
+        });
+        this.waitQueue.push(waitQueueMember);
+        processWaitQueue(this);
+        try {
+            timeout?.throwIfExpired();
+            const server = await (timeout ? Promise.race([serverPromise, timeout]) : serverPromise);
+            if (options.timeoutContext?.csotEnabled() && server.description.minRoundTripTime !== 0) {
+                options.timeoutContext.minRoundTripTime = server.description.minRoundTripTime;
+            }
+            return server;
+        }
+        catch (error) {
+            if (timeout_1.TimeoutError.is(error)) {
+                // Timeout
+                waitQueueMember.cancelled = true;
+                const timeoutError = new error_1.MongoServerSelectionError(`Server selection timed out after ${timeout?.duration} ms`, this.description);
+                if (this.client.mongoLogger?.willLog(mongo_logger_1.MongoLoggableComponent.SERVER_SELECTION, mongo_logger_1.SeverityLevel.DEBUG)) {
+                    this.client.mongoLogger?.debug(mongo_logger_1.MongoLoggableComponent.SERVER_SELECTION, new server_selection_events_1.ServerSelectionFailedEvent(selector, this.description, timeoutError, options.operationName));
+                }
+                if (options.timeoutContext?.csotEnabled()) {
+                    throw new error_1.MongoOperationTimeoutError('Timed out during server selection', {
+                        cause: timeoutError
+                    });
+                }
+                throw timeoutError;
+            }
+            // Other server selection error
+            throw error;
+        }
+        finally {
+            abortListener?.[utils_1.kDispose]();
+            if (options.timeoutContext?.clearServerSelectionTimeout)
+                timeout?.clear();
+        }
+    }
+    /**
+     * Update the internal TopologyDescription with a ServerDescription
+     *
+     * @param serverDescription - The server to update in the internal list of server descriptions
+     */
+    serverUpdateHandler(serverDescription) {
+        if (!this.s.description.hasServer(serverDescription.address)) {
+            return;
+        }
+        // ignore this server update if its from an outdated topologyVersion
+        if (isStaleServerDescription(this.s.description, serverDescription)) {
+            return;
+        }
+        // these will be used for monitoring events later
+        const previousTopologyDescription = this.s.description;
+        const previousServerDescription = this.s.description.servers.get(serverDescription.address);
+        if (!previousServerDescription) {
+            return;
+        }
+        // Driver Sessions Spec: "Whenever a driver receives a cluster time from
+        // a server it MUST compare it to the current highest seen cluster time
+        // for the deployment. If the new cluster time is higher than the
+        // highest seen cluster time it MUST become the new highest seen cluster
+        // time. Two cluster times are compared using only the BsonTimestamp
+        // value of the clusterTime embedded field."
+        const clusterTime = serverDescription.$clusterTime;
+        if (clusterTime) {
+            (0, common_1._advanceClusterTime)(this, clusterTime);
+        }
+        // If we already know all the information contained in this updated description, then
+        // we don't need to emit SDAM events, but still need to update the description, in order
+        // to keep client-tracked attributes like last update time and round trip time up to date
+        const equalDescriptions = previousServerDescription && previousServerDescription.equals(serverDescription);
+        // first update the TopologyDescription
+        this.s.description = this.s.description.update(serverDescription);
+        if (this.s.description.compatibilityError) {
+            this.emit(Topology.ERROR, new error_1.MongoCompatibilityError(this.s.description.compatibilityError));
+            return;
+        }
+        // emit monitoring events for this change
+        if (!equalDescriptions) {
+            const newDescription = this.s.description.servers.get(serverDescription.address);
+            if (newDescription) {
+                this.emit(Topology.SERVER_DESCRIPTION_CHANGED, new events_1.ServerDescriptionChangedEvent(this.s.id, serverDescription.address, previousServerDescription, newDescription));
+            }
+        }
+        // update server list from updated descriptions
+        updateServers(this, serverDescription);
+        // attempt to resolve any outstanding server selection attempts
+        if (this.waitQueue.length > 0) {
+            processWaitQueue(this);
+        }
+        if (!equalDescriptions) {
+            this.emitAndLog(Topology.TOPOLOGY_DESCRIPTION_CHANGED, new events_1.TopologyDescriptionChangedEvent(this.s.id, previousTopologyDescription, this.s.description));
+        }
+    }
+    auth(credentials, callback) {
+        if (typeof credentials === 'function')
+            ((callback = credentials), (credentials = undefined));
+        if (typeof callback === 'function')
+            callback(undefined, true);
+    }
+    isConnected() {
+        return this.s.state === common_1.STATE_CONNECTED;
+    }
+    isDestroyed() {
+        return this.s.state === common_1.STATE_CLOSED;
+    }
+    // NOTE: There are many places in code where we explicitly check the last hello
+    //       to do feature support detection. This should be done any other way, but for
+    //       now we will just return the first hello seen, which should suffice.
+    lastHello() {
+        const serverDescriptions = Array.from(this.description.servers.values());
+        if (serverDescriptions.length === 0)
+            return {};
+        const sd = serverDescriptions.filter((sd) => sd.type !== common_1.ServerType.Unknown)[0];
+        const result = sd || { maxWireVersion: this.description.commonWireVersion };
+        return result;
+    }
+    get commonWireVersion() {
+        return this.description.commonWireVersion;
+    }
+    get logicalSessionTimeoutMinutes() {
+        return this.description.logicalSessionTimeoutMinutes;
+    }
+    get clusterTime() {
+        return this.s.clusterTime;
+    }
+    set clusterTime(clusterTime) {
+        this.s.clusterTime = clusterTime;
+    }
+}
+exports.Topology = Topology;
+/** Destroys a server, and removes all event listeners from the instance */
+function closeServer(server, topology) {
+    for (const event of constants_1.LOCAL_SERVER_EVENTS) {
+        server.removeAllListeners(event);
+    }
+    server.close();
+    topology.emitAndLog(Topology.SERVER_CLOSED, new events_1.ServerClosedEvent(topology.s.id, server.description.address));
+    for (const event of constants_1.SERVER_RELAY_EVENTS) {
+        server.removeAllListeners(event);
+    }
+}
+/** Predicts the TopologyType from options */
+function topologyTypeFromOptions(options) {
+    if (options?.directConnection) {
+        return common_1.TopologyType.Single;
+    }
+    if (options?.replicaSet) {
+        return common_1.TopologyType.ReplicaSetNoPrimary;
+    }
+    if (options?.loadBalanced) {
+        return common_1.TopologyType.LoadBalanced;
+    }
+    return common_1.TopologyType.Unknown;
+}
+/**
+ * Creates new server instances and attempts to connect them
+ *
+ * @param topology - The topology that this server belongs to
+ * @param serverDescription - The description for the server to initialize and connect to
+ */
+function createAndConnectServer(topology, serverDescription) {
+    topology.emitAndLog(Topology.SERVER_OPENING, new events_1.ServerOpeningEvent(topology.s.id, serverDescription.address));
+    const server = new server_1.Server(topology, serverDescription, topology.s.options);
+    for (const event of constants_1.SERVER_RELAY_EVENTS) {
+        server.on(event, (e) => topology.emit(event, e));
+    }
+    server.on(server_1.Server.DESCRIPTION_RECEIVED, description => topology.serverUpdateHandler(description));
+    server.connect();
+    return server;
+}
+/**
+ * @param topology - Topology to update.
+ * @param incomingServerDescription - New server description.
+ */
+function updateServers(topology, incomingServerDescription) {
+    // update the internal server's description
+    if (incomingServerDescription && topology.s.servers.has(incomingServerDescription.address)) {
+        const server = topology.s.servers.get(incomingServerDescription.address);
+        if (server) {
+            server.s.description = incomingServerDescription;
+            if (incomingServerDescription.error instanceof error_1.MongoError &&
+                incomingServerDescription.error.hasErrorLabel(error_1.MongoErrorLabel.ResetPool)) {
+                const interruptInUseConnections = incomingServerDescription.error.hasErrorLabel(error_1.MongoErrorLabel.InterruptInUseConnections);
+                server.pool.clear({ interruptInUseConnections });
+            }
+            else if (incomingServerDescription.error == null) {
+                const newTopologyType = topology.s.description.type;
+                const shouldMarkPoolReady = incomingServerDescription.isDataBearing ||
+                    (incomingServerDescription.type !== common_1.ServerType.Unknown &&
+                        newTopologyType === common_1.TopologyType.Single);
+                if (shouldMarkPoolReady) {
+                    server.pool.ready();
+                }
+            }
+        }
+    }
+    // add new servers for all descriptions we currently don't know about locally
+    for (const serverDescription of topology.description.servers.values()) {
+        if (!topology.s.servers.has(serverDescription.address)) {
+            const server = createAndConnectServer(topology, serverDescription);
+            topology.s.servers.set(serverDescription.address, server);
+        }
+    }
+    // for all servers no longer known, remove their descriptions and destroy their instances
+    for (const entry of topology.s.servers) {
+        const serverAddress = entry[0];
+        if (topology.description.hasServer(serverAddress)) {
+            continue;
+        }
+        if (!topology.s.servers.has(serverAddress)) {
+            continue;
+        }
+        const server = topology.s.servers.get(serverAddress);
+        topology.s.servers.delete(serverAddress);
+        // prepare server for garbage collection
+        if (server) {
+            closeServer(server, topology);
+        }
+    }
+}
+function drainWaitQueue(queue, drainError) {
+    while (queue.length) {
+        const waitQueueMember = queue.shift();
+        if (!waitQueueMember) {
+            continue;
+        }
+        if (!waitQueueMember.cancelled) {
+            if (waitQueueMember.mongoLogger?.willLog(mongo_logger_1.MongoLoggableComponent.SERVER_SELECTION, mongo_logger_1.SeverityLevel.DEBUG)) {
+                waitQueueMember.mongoLogger?.debug(mongo_logger_1.MongoLoggableComponent.SERVER_SELECTION, new server_selection_events_1.ServerSelectionFailedEvent(waitQueueMember.serverSelector, waitQueueMember.topologyDescription, drainError, waitQueueMember.operationName));
+            }
+            waitQueueMember.reject(drainError);
+        }
+    }
+}
+function processWaitQueue(topology) {
+    if (topology.s.state === common_1.STATE_CLOSED) {
+        drainWaitQueue(topology.waitQueue, new error_1.MongoTopologyClosedError());
+        return;
+    }
+    const isSharded = topology.description.type === common_1.TopologyType.Sharded;
+    const serverDescriptions = Array.from(topology.description.servers.values());
+    const membersToProcess = topology.waitQueue.length;
+    for (let i = 0; i < membersToProcess; ++i) {
+        const waitQueueMember = topology.waitQueue.shift();
+        if (!waitQueueMember) {
+            continue;
+        }
+        if (waitQueueMember.cancelled) {
+            continue;
+        }
+        let selectedDescriptions;
+        try {
+            const serverSelector = waitQueueMember.serverSelector;
+            const previousServer = waitQueueMember.previousServer;
+            selectedDescriptions = serverSelector
+                ? serverSelector(topology.description, serverDescriptions, previousServer ? [previousServer] : [])
+                : serverDescriptions;
+        }
+        catch (selectorError) {
+            if (topology.client.mongoLogger?.willLog(mongo_logger_1.MongoLoggableComponent.SERVER_SELECTION, mongo_logger_1.SeverityLevel.DEBUG)) {
+                topology.client.mongoLogger?.debug(mongo_logger_1.MongoLoggableComponent.SERVER_SELECTION, new server_selection_events_1.ServerSelectionFailedEvent(waitQueueMember.serverSelector, topology.description, selectorError, waitQueueMember.operationName));
+            }
+            waitQueueMember.reject(selectorError);
+            continue;
+        }
+        let selectedServer;
+        if (selectedDescriptions.length === 0) {
+            if (!waitQueueMember.waitingLogged) {
+                if (topology.client.mongoLogger?.willLog(mongo_logger_1.MongoLoggableComponent.SERVER_SELECTION, mongo_logger_1.SeverityLevel.INFORMATIONAL)) {
+                    topology.client.mongoLogger?.info(mongo_logger_1.MongoLoggableComponent.SERVER_SELECTION, new server_selection_events_1.WaitingForSuitableServerEvent(waitQueueMember.serverSelector, topology.description, topology.s.serverSelectionTimeoutMS !== 0
+                        ? topology.s.serverSelectionTimeoutMS - ((0, utils_1.now)() - waitQueueMember.startTime)
+                        : -1, waitQueueMember.operationName));
+                }
+                waitQueueMember.waitingLogged = true;
+            }
+            topology.waitQueue.push(waitQueueMember);
+            continue;
+        }
+        else if (selectedDescriptions.length === 1) {
+            selectedServer = topology.s.servers.get(selectedDescriptions[0].address);
+        }
+        else {
+            const descriptions = (0, utils_1.shuffle)(selectedDescriptions, 2);
+            const server1 = topology.s.servers.get(descriptions[0].address);
+            const server2 = topology.s.servers.get(descriptions[1].address);
+            selectedServer =
+                server1 && server2 && server1.s.operationCount < server2.s.operationCount
+                    ? server1
+                    : server2;
+        }
+        if (!selectedServer) {
+            const serverSelectionError = new error_1.MongoServerSelectionError('server selection returned a server description but the server was not found in the topology', topology.description);
+            if (topology.client.mongoLogger?.willLog(mongo_logger_1.MongoLoggableComponent.SERVER_SELECTION, mongo_logger_1.SeverityLevel.DEBUG)) {
+                topology.client.mongoLogger?.debug(mongo_logger_1.MongoLoggableComponent.SERVER_SELECTION, new server_selection_events_1.ServerSelectionFailedEvent(waitQueueMember.serverSelector, topology.description, serverSelectionError, waitQueueMember.operationName));
+            }
+            waitQueueMember.reject(serverSelectionError);
+            return;
+        }
+        const transaction = waitQueueMember.transaction;
+        if (isSharded && transaction && transaction.isActive && selectedServer) {
+            transaction.pinServer(selectedServer);
+        }
+        if (topology.client.mongoLogger?.willLog(mongo_logger_1.MongoLoggableComponent.SERVER_SELECTION, mongo_logger_1.SeverityLevel.DEBUG)) {
+            topology.client.mongoLogger?.debug(mongo_logger_1.MongoLoggableComponent.SERVER_SELECTION, new server_selection_events_1.ServerSelectionSucceededEvent(waitQueueMember.serverSelector, waitQueueMember.topologyDescription, selectedServer.pool.address, waitQueueMember.operationName));
+        }
+        waitQueueMember.resolve(selectedServer);
+    }
+    if (topology.waitQueue.length > 0) {
+        // ensure all server monitors attempt monitoring soon
+        for (const [, server] of topology.s.servers) {
+            process.nextTick(function scheduleServerCheck() {
+                return server.requestCheck();
+            });
+        }
+    }
+}
+function isStaleServerDescription(topologyDescription, incomingServerDescription) {
+    const currentServerDescription = topologyDescription.servers.get(incomingServerDescription.address);
+    const currentTopologyVersion = currentServerDescription?.topologyVersion;
+    return ((0, server_description_1.compareTopologyVersion)(currentTopologyVersion, incomingServerDescription.topologyVersion) > 0);
+}
+//# sourceMappingURL=topology.js.map

node_modules/mongodb/lib/sdam/topology_description.js

@@ -0,0 +1,383 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.TopologyDescription = void 0;
+const bson_1 = require("../bson");
+const WIRE_CONSTANTS = require("../cmap/wire_protocol/constants");
+const error_1 = require("../error");
+const utils_1 = require("../utils");
+const common_1 = require("./common");
+const server_description_1 = require("./server_description");
+// constants related to compatibility checks
+const MIN_SUPPORTED_SERVER_VERSION = WIRE_CONSTANTS.MIN_SUPPORTED_SERVER_VERSION;
+const MAX_SUPPORTED_SERVER_VERSION = WIRE_CONSTANTS.MAX_SUPPORTED_SERVER_VERSION;
+const MIN_SUPPORTED_WIRE_VERSION = WIRE_CONSTANTS.MIN_SUPPORTED_WIRE_VERSION;
+const MAX_SUPPORTED_WIRE_VERSION = WIRE_CONSTANTS.MAX_SUPPORTED_WIRE_VERSION;
+const MONGOS_OR_UNKNOWN = new Set([common_1.ServerType.Mongos, common_1.ServerType.Unknown]);
+const MONGOS_OR_STANDALONE = new Set([common_1.ServerType.Mongos, common_1.ServerType.Standalone]);
+const NON_PRIMARY_RS_MEMBERS = new Set([
+    common_1.ServerType.RSSecondary,
+    common_1.ServerType.RSArbiter,
+    common_1.ServerType.RSOther
+]);
+/**
+ * Representation of a deployment of servers
+ * @public
+ */
+class TopologyDescription {
+    /**
+     * Create a TopologyDescription
+     */
+    constructor(topologyType, serverDescriptions = null, setName = null, maxSetVersion = null, maxElectionId = null, commonWireVersion = null, options = null) {
+        options = options ?? {};
+        this.type = topologyType ?? common_1.TopologyType.Unknown;
+        this.servers = serverDescriptions ?? new Map();
+        this.stale = false;
+        this.compatible = true;
+        this.heartbeatFrequencyMS = options.heartbeatFrequencyMS ?? 0;
+        this.localThresholdMS = options.localThresholdMS ?? 15;
+        this.setName = setName ?? null;
+        this.maxElectionId = maxElectionId ?? null;
+        this.maxSetVersion = maxSetVersion ?? null;
+        this.commonWireVersion = commonWireVersion ?? 0;
+        // determine server compatibility
+        for (const serverDescription of this.servers.values()) {
+            // Load balancer mode is always compatible.
+            if (serverDescription.type === common_1.ServerType.Unknown ||
+                serverDescription.type === common_1.ServerType.LoadBalancer) {
+                continue;
+            }
+            if (serverDescription.minWireVersion > MAX_SUPPORTED_WIRE_VERSION) {
+                this.compatible = false;
+                this.compatibilityError = `Server at ${serverDescription.address} requires wire version ${serverDescription.minWireVersion}, but this version of the driver only supports up to ${MAX_SUPPORTED_WIRE_VERSION} (MongoDB ${MAX_SUPPORTED_SERVER_VERSION})`;
+            }
+            if (serverDescription.maxWireVersion < MIN_SUPPORTED_WIRE_VERSION) {
+                this.compatible = false;
+                this.compatibilityError = `Server at ${serverDescription.address} reports wire version ${serverDescription.maxWireVersion}, but this version of the driver requires at least ${MIN_SUPPORTED_WIRE_VERSION} (MongoDB ${MIN_SUPPORTED_SERVER_VERSION}).`;
+                break;
+            }
+        }
+        // Whenever a client updates the TopologyDescription from a hello response, it MUST set
+        // TopologyDescription.logicalSessionTimeoutMinutes to the smallest logicalSessionTimeoutMinutes
+        // value among ServerDescriptions of all data-bearing server types. If any have a null
+        // logicalSessionTimeoutMinutes, then TopologyDescription.logicalSessionTimeoutMinutes MUST be
+        // set to null.
+        this.logicalSessionTimeoutMinutes = null;
+        for (const [, server] of this.servers) {
+            if (server.isReadable) {
+                if (server.logicalSessionTimeoutMinutes == null) {
+                    // If any of the servers have a null logicalSessionsTimeout, then the whole topology does
+                    this.logicalSessionTimeoutMinutes = null;
+                    break;
+                }
+                if (this.logicalSessionTimeoutMinutes == null) {
+                    // First server with a non null logicalSessionsTimeout
+                    this.logicalSessionTimeoutMinutes = server.logicalSessionTimeoutMinutes;
+                    continue;
+                }
+                // Always select the smaller of the:
+                // current server logicalSessionsTimeout and the topologies logicalSessionsTimeout
+                this.logicalSessionTimeoutMinutes = Math.min(this.logicalSessionTimeoutMinutes, server.logicalSessionTimeoutMinutes);
+            }
+        }
+    }
+    /**
+     * Returns a new TopologyDescription based on the SrvPollingEvent
+     * @internal
+     */
+    updateFromSrvPollingEvent(ev, srvMaxHosts = 0) {
+        /** The SRV addresses defines the set of addresses we should be using */
+        const incomingHostnames = ev.hostnames();
+        const currentHostnames = new Set(this.servers.keys());
+        const hostnamesToAdd = new Set(incomingHostnames);
+        const hostnamesToRemove = new Set();
+        for (const hostname of currentHostnames) {
+            // filter hostnamesToAdd (made from incomingHostnames) down to what is *not* present in currentHostnames
+            hostnamesToAdd.delete(hostname);
+            if (!incomingHostnames.has(hostname)) {
+                // If the SRV Records no longer include this hostname
+                // we have to stop using it
+                hostnamesToRemove.add(hostname);
+            }
+        }
+        if (hostnamesToAdd.size === 0 && hostnamesToRemove.size === 0) {
+            // No new hosts to add and none to remove
+            return this;
+        }
+        const serverDescriptions = new Map(this.servers);
+        for (const removedHost of hostnamesToRemove) {
+            serverDescriptions.delete(removedHost);
+        }
+        if (hostnamesToAdd.size > 0) {
+            if (srvMaxHosts === 0) {
+                // Add all!
+                for (const hostToAdd of hostnamesToAdd) {
+                    serverDescriptions.set(hostToAdd, new server_description_1.ServerDescription(hostToAdd));
+                }
+            }
+            else if (serverDescriptions.size < srvMaxHosts) {
+                // Add only the amount needed to get us back to srvMaxHosts
+                const selectedHosts = (0, utils_1.shuffle)(hostnamesToAdd, srvMaxHosts - serverDescriptions.size);
+                for (const selectedHostToAdd of selectedHosts) {
+                    serverDescriptions.set(selectedHostToAdd, new server_description_1.ServerDescription(selectedHostToAdd));
+                }
+            }
+        }
+        return new TopologyDescription(this.type, serverDescriptions, this.setName, this.maxSetVersion, this.maxElectionId, this.commonWireVersion, { heartbeatFrequencyMS: this.heartbeatFrequencyMS, localThresholdMS: this.localThresholdMS });
+    }
+    /**
+     * Returns a copy of this description updated with a given ServerDescription
+     * @internal
+     */
+    update(serverDescription) {
+        const address = serverDescription.address;
+        // potentially mutated values
+        let { type: topologyType, setName, maxSetVersion, maxElectionId, commonWireVersion } = this;
+        const serverType = serverDescription.type;
+        const serverDescriptions = new Map(this.servers);
+        // update common wire version
+        if (serverDescription.maxWireVersion !== 0) {
+            if (commonWireVersion == null) {
+                commonWireVersion = serverDescription.maxWireVersion;
+            }
+            else {
+                commonWireVersion = Math.min(commonWireVersion, serverDescription.maxWireVersion);
+            }
+        }
+        if (typeof serverDescription.setName === 'string' &&
+            typeof setName === 'string' &&
+            serverDescription.setName !== setName) {
+            if (topologyType === common_1.TopologyType.Single) {
+                // "Single" Topology with setName mismatch is direct connection usage, mark unknown do not remove
+                serverDescription = new server_description_1.ServerDescription(address);
+            }
+            else {
+                serverDescriptions.delete(address);
+            }
+        }
+        // update the actual server description
+        serverDescriptions.set(address, serverDescription);
+        if (topologyType === common_1.TopologyType.Single) {
+            // once we are defined as single, that never changes
+            return new TopologyDescription(common_1.TopologyType.Single, serverDescriptions, setName, maxSetVersion, maxElectionId, commonWireVersion, { heartbeatFrequencyMS: this.heartbeatFrequencyMS, localThresholdMS: this.localThresholdMS });
+        }
+        if (topologyType === common_1.TopologyType.Unknown) {
+            if (serverType === common_1.ServerType.Standalone && this.servers.size !== 1) {
+                serverDescriptions.delete(address);
+            }
+            else {
+                topologyType = topologyTypeForServerType(serverType);
+            }
+        }
+        if (topologyType === common_1.TopologyType.Sharded) {
+            if (!MONGOS_OR_UNKNOWN.has(serverType)) {
+                serverDescriptions.delete(address);
+            }
+        }
+        if (topologyType === common_1.TopologyType.ReplicaSetNoPrimary) {
+            if (MONGOS_OR_STANDALONE.has(serverType)) {
+                serverDescriptions.delete(address);
+            }
+            if (serverType === common_1.ServerType.RSPrimary) {
+                const result = updateRsFromPrimary(serverDescriptions, serverDescription, setName, maxSetVersion, maxElectionId);
+                topologyType = result[0];
+                setName = result[1];
+                maxSetVersion = result[2];
+                maxElectionId = result[3];
+            }
+            else if (NON_PRIMARY_RS_MEMBERS.has(serverType)) {
+                const result = updateRsNoPrimaryFromMember(serverDescriptions, serverDescription, setName);
+                topologyType = result[0];
+                setName = result[1];
+            }
+        }
+        if (topologyType === common_1.TopologyType.ReplicaSetWithPrimary) {
+            if (MONGOS_OR_STANDALONE.has(serverType)) {
+                serverDescriptions.delete(address);
+                topologyType = checkHasPrimary(serverDescriptions);
+            }
+            else if (serverType === common_1.ServerType.RSPrimary) {
+                const result = updateRsFromPrimary(serverDescriptions, serverDescription, setName, maxSetVersion, maxElectionId);
+                topologyType = result[0];
+                setName = result[1];
+                maxSetVersion = result[2];
+                maxElectionId = result[3];
+            }
+            else if (NON_PRIMARY_RS_MEMBERS.has(serverType)) {
+                topologyType = updateRsWithPrimaryFromMember(serverDescriptions, serverDescription, setName);
+            }
+            else {
+                topologyType = checkHasPrimary(serverDescriptions);
+            }
+        }
+        return new TopologyDescription(topologyType, serverDescriptions, setName, maxSetVersion, maxElectionId, commonWireVersion, { heartbeatFrequencyMS: this.heartbeatFrequencyMS, localThresholdMS: this.localThresholdMS });
+    }
+    get error() {
+        const descriptionsWithError = Array.from(this.servers.values()).filter((sd) => sd.error);
+        if (descriptionsWithError.length > 0) {
+            return descriptionsWithError[0].error;
+        }
+        return null;
+    }
+    /**
+     * Determines if the topology description has any known servers
+     */
+    get hasKnownServers() {
+        return Array.from(this.servers.values()).some((sd) => sd.type !== common_1.ServerType.Unknown);
+    }
+    /**
+     * Determines if this topology description has a data-bearing server available.
+     */
+    get hasDataBearingServers() {
+        return Array.from(this.servers.values()).some((sd) => sd.isDataBearing);
+    }
+    /**
+     * Determines if the topology has a definition for the provided address
+     * @internal
+     */
+    hasServer(address) {
+        return this.servers.has(address);
+    }
+    /**
+     * Returns a JSON-serializable representation of the TopologyDescription.  This is primarily
+     * intended for use with JSON.stringify().
+     *
+     * This method will not throw.
+     */
+    toJSON() {
+        return bson_1.EJSON.serialize(this);
+    }
+}
+exports.TopologyDescription = TopologyDescription;
+function topologyTypeForServerType(serverType) {
+    switch (serverType) {
+        case common_1.ServerType.Standalone:
+            return common_1.TopologyType.Single;
+        case common_1.ServerType.Mongos:
+            return common_1.TopologyType.Sharded;
+        case common_1.ServerType.RSPrimary:
+            return common_1.TopologyType.ReplicaSetWithPrimary;
+        case common_1.ServerType.RSOther:
+        case common_1.ServerType.RSSecondary:
+            return common_1.TopologyType.ReplicaSetNoPrimary;
+        default:
+            return common_1.TopologyType.Unknown;
+    }
+}
+function updateRsFromPrimary(serverDescriptions, serverDescription, setName = null, maxSetVersion = null, maxElectionId = null) {
+    const setVersionElectionIdMismatch = (serverDescription, maxSetVersion, maxElectionId) => {
+        return (`primary marked stale due to electionId/setVersion mismatch:` +
+            ` server setVersion: ${serverDescription.setVersion},` +
+            ` server electionId: ${serverDescription.electionId},` +
+            ` topology setVersion: ${maxSetVersion},` +
+            ` topology electionId: ${maxElectionId}`);
+    };
+    setName = setName || serverDescription.setName;
+    if (setName !== serverDescription.setName) {
+        serverDescriptions.delete(serverDescription.address);
+        return [checkHasPrimary(serverDescriptions), setName, maxSetVersion, maxElectionId];
+    }
+    if (serverDescription.maxWireVersion >= 17) {
+        const electionIdComparison = (0, utils_1.compareObjectId)(maxElectionId, serverDescription.electionId);
+        const maxElectionIdIsEqual = electionIdComparison === 0;
+        const maxElectionIdIsLess = electionIdComparison === -1;
+        const maxSetVersionIsLessOrEqual = (maxSetVersion ?? -1) <= (serverDescription.setVersion ?? -1);
+        if (maxElectionIdIsLess || (maxElectionIdIsEqual && maxSetVersionIsLessOrEqual)) {
+            // The reported electionId was greater
+            // or the electionId was equal and reported setVersion was greater
+            // Always update both values, they are a tuple
+            maxElectionId = serverDescription.electionId;
+            maxSetVersion = serverDescription.setVersion;
+        }
+        else {
+            // Stale primary
+            // replace serverDescription with a default ServerDescription of type "Unknown"
+            serverDescriptions.set(serverDescription.address, new server_description_1.ServerDescription(serverDescription.address, undefined, {
+                error: new error_1.MongoStalePrimaryError(setVersionElectionIdMismatch(serverDescription, maxSetVersion, maxElectionId))
+            }));
+            return [checkHasPrimary(serverDescriptions), setName, maxSetVersion, maxElectionId];
+        }
+    }
+    else {
+        const electionId = serverDescription.electionId ? serverDescription.electionId : null;
+        if (serverDescription.setVersion && electionId) {
+            if (maxSetVersion && maxElectionId) {
+                if (maxSetVersion > serverDescription.setVersion ||
+                    (0, utils_1.compareObjectId)(maxElectionId, electionId) > 0) {
+                    // this primary is stale, we must remove it
+                    serverDescriptions.set(serverDescription.address, new server_description_1.ServerDescription(serverDescription.address, undefined, {
+                        error: new error_1.MongoStalePrimaryError(setVersionElectionIdMismatch(serverDescription, maxSetVersion, maxElectionId))
+                    }));
+                    return [checkHasPrimary(serverDescriptions), setName, maxSetVersion, maxElectionId];
+                }
+            }
+            maxElectionId = serverDescription.electionId;
+        }
+        if (serverDescription.setVersion != null &&
+            (maxSetVersion == null || serverDescription.setVersion > maxSetVersion)) {
+            maxSetVersion = serverDescription.setVersion;
+        }
+    }
+    // We've heard from the primary. Is it the same primary as before?
+    for (const [address, server] of serverDescriptions) {
+        if (server.type === common_1.ServerType.RSPrimary && server.address !== serverDescription.address) {
+            // Reset old primary's type to Unknown.
+            serverDescriptions.set(address, new server_description_1.ServerDescription(server.address, undefined, {
+                error: new error_1.MongoStalePrimaryError('primary marked stale due to discovery of newer primary')
+            }));
+            // There can only be one primary
+            break;
+        }
+    }
+    // Discover new hosts from this primary's response.
+    serverDescription.allHosts.forEach((address) => {
+        if (!serverDescriptions.has(address)) {
+            serverDescriptions.set(address, new server_description_1.ServerDescription(address));
+        }
+    });
+    // Remove hosts not in the response.
+    const currentAddresses = Array.from(serverDescriptions.keys());
+    const responseAddresses = serverDescription.allHosts;
+    currentAddresses
+        .filter((addr) => responseAddresses.indexOf(addr) === -1)
+        .forEach((address) => {
+        serverDescriptions.delete(address);
+    });
+    return [checkHasPrimary(serverDescriptions), setName, maxSetVersion, maxElectionId];
+}
+function updateRsWithPrimaryFromMember(serverDescriptions, serverDescription, setName = null) {
+    if (setName == null) {
+        // TODO(NODE-3483): should be an appropriate runtime error
+        throw new error_1.MongoRuntimeError('Argument "setName" is required if connected to a replica set');
+    }
+    if (setName !== serverDescription.setName ||
+        (serverDescription.me && serverDescription.address !== serverDescription.me)) {
+        serverDescriptions.delete(serverDescription.address);
+    }
+    return checkHasPrimary(serverDescriptions);
+}
+function updateRsNoPrimaryFromMember(serverDescriptions, serverDescription, setName = null) {
+    const topologyType = common_1.TopologyType.ReplicaSetNoPrimary;
+    setName = setName ?? serverDescription.setName;
+    if (setName !== serverDescription.setName) {
+        serverDescriptions.delete(serverDescription.address);
+        return [topologyType, setName];
+    }
+    serverDescription.allHosts.forEach((address) => {
+        if (!serverDescriptions.has(address)) {
+            serverDescriptions.set(address, new server_description_1.ServerDescription(address));
+        }
+    });
+    if (serverDescription.me && serverDescription.address !== serverDescription.me) {
+        serverDescriptions.delete(serverDescription.address);
+    }
+    return [topologyType, setName];
+}
+function checkHasPrimary(serverDescriptions) {
+    for (const serverDescription of serverDescriptions.values()) {
+        if (serverDescription.type === common_1.ServerType.RSPrimary) {
+            return common_1.TopologyType.ReplicaSetWithPrimary;
+        }
+    }
+    return common_1.TopologyType.ReplicaSetNoPrimary;
+}
+//# sourceMappingURL=topology_description.js.map