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import * as WIRE_CONSTANTS from '../cmap/wire_protocol/constants';
import { type MongoError, MongoRuntimeError, MongoStalePrimaryError } from '../error';
import { compareObjectId, shuffle } from '../utils';
import { ServerType, TopologyType } from './common';
import { ServerDescription } from './server_description';
import type { SrvPollingEvent } from './srv_polling';
// 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<ServerType>([ServerType.Mongos, ServerType.Unknown]);
const MONGOS_OR_STANDALONE = new Set<ServerType>([ServerType.Mongos, ServerType.Standalone]);
const NON_PRIMARY_RS_MEMBERS = new Set<ServerType>([
ServerType.RSSecondary,
ServerType.RSArbiter,
ServerType.RSOther
]);
/** @public */
export interface TopologyDescriptionOptions {
heartbeatFrequencyMS?: number;
localThresholdMS?: number;
}
/**
* Representation of a deployment of servers
* @public
*/
export class TopologyDescription {
type: TopologyType;
setName: string | null;
maxSetVersion: number | null;
maxElectionId: ObjectId | null;
servers: Map<string, ServerDescription>;
stale: boolean;
compatible: boolean;
compatibilityError?: string;
logicalSessionTimeoutMinutes: number | null;
heartbeatFrequencyMS: number;
localThresholdMS: number;
commonWireVersion: number;
/**
* Create a TopologyDescription
*/
constructor(
topologyType: TopologyType,
serverDescriptions: Map<string, ServerDescription> | null = null,
setName: string | null = null,
maxSetVersion: number | null = null,
maxElectionId: ObjectId | null = null,
commonWireVersion: number | null = null,
options: TopologyDescriptionOptions | null = null
) {
options = options ?? {};
this.type = topologyType ?? 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 === ServerType.Unknown ||
serverDescription.type === 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: SrvPollingEvent, srvMaxHosts = 0): TopologyDescription {
/** 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<string>(incomingHostnames);
const hostnamesToRemove = new Set<string>();
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);
}
}
Iif (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 ServerDescription(hostToAdd));
}
} else Eif (serverDescriptions.size < srvMaxHosts) {
// Add only the amount needed to get us back to srvMaxHosts
const selectedHosts = shuffle(hostnamesToAdd, srvMaxHosts - serverDescriptions.size);
for (const selectedHostToAdd of selectedHosts) {
serverDescriptions.set(selectedHostToAdd, new 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: ServerDescription): TopologyDescription {
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) {
Iif (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 === TopologyType.Single) {
// "Single" Topology with setName mismatch is direct connection usage, mark unknown do not remove
serverDescription = new ServerDescription(address);
} else {
serverDescriptions.delete(address);
}
}
// update the actual server description
serverDescriptions.set(address, serverDescription);
if (topologyType === TopologyType.Single) {
// once we are defined as single, that never changes
return new TopologyDescription(
TopologyType.Single,
serverDescriptions,
setName,
maxSetVersion,
maxElectionId,
commonWireVersion,
{ heartbeatFrequencyMS: this.heartbeatFrequencyMS, localThresholdMS: this.localThresholdMS }
);
}
if (topologyType === TopologyType.Unknown) {
if (serverType === ServerType.Standalone && this.servers.size !== 1) {
serverDescriptions.delete(address);
} else {
topologyType = topologyTypeForServerType(serverType);
}
}
if (topologyType === TopologyType.Sharded) {
if (!MONGOS_OR_UNKNOWN.has(serverType)) {
serverDescriptions.delete(address);
}
}
if (topologyType === TopologyType.ReplicaSetNoPrimary) {
if (MONGOS_OR_STANDALONE.has(serverType)) {
serverDescriptions.delete(address);
}
if (serverType === 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 === TopologyType.ReplicaSetWithPrimary) {
if (MONGOS_OR_STANDALONE.has(serverType)) {
serverDescriptions.delete(address);
topologyType = checkHasPrimary(serverDescriptions);
} else if (serverType === 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(): MongoError | null {
const descriptionsWithError = Array.from(this.servers.values()).filter(
(sd: ServerDescription) => sd.error
);
if (descriptionsWithError.length > 0) {
return descriptionsWithError[0].error;
}
return null;
}
/**
* Determines if the topology description has any known servers
*/
get hasKnownServers(): boolean {
return Array.from(this.servers.values()).some(
(sd: ServerDescription) => sd.type !== ServerType.Unknown
);
}
/**
* Determines if this topology description has a data-bearing server available.
*/
get hasDataBearingServers(): boolean {
return Array.from(this.servers.values()).some((sd: ServerDescription) => sd.isDataBearing);
}
/**
* Determines if the topology has a definition for the provided address
* @internal
*/
hasServer(address: string): boolean {
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 EJSON.serialize(this);
}
}
function topologyTypeForServerType(serverType: ServerType): TopologyType {
switch (serverType) {
case ServerType.Standalone:
return TopologyType.Single;
case ServerType.Mongos:
return TopologyType.Sharded;
case ServerType.RSPrimary:
return TopologyType.ReplicaSetWithPrimary;
case ServerType.RSOther:
case ServerType.RSSecondary:
return TopologyType.ReplicaSetNoPrimary;
default:
return TopologyType.Unknown;
}
}
function updateRsFromPrimary(
serverDescriptions: Map<string, ServerDescription>,
serverDescription: ServerDescription,
setName: string | null = null,
maxSetVersion: number | null = null,
maxElectionId: ObjectId | null = null
): [TopologyType, string | null, number | null, ObjectId | null] {
const setVersionElectionIdMismatch = (
serverDescription: ServerDescription,
maxSetVersion: number | null,
maxElectionId: ObjectId | null
) => {
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 = 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 ServerDescription(serverDescription.address, undefined, {
error: new 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 ||
compareObjectId(maxElectionId, electionId) > 0
) {
// this primary is stale, we must remove it
serverDescriptions.set(
serverDescription.address,
new ServerDescription(serverDescription.address, undefined, {
error: new 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 === ServerType.RSPrimary && server.address !== serverDescription.address) {
// Reset old primary's type to Unknown.
serverDescriptions.set(
address,
new ServerDescription(server.address, undefined, {
error: new 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: string) => {
if (!serverDescriptions.has(address)) {
serverDescriptions.set(address, new ServerDescription(address));
}
});
// Remove hosts not in the response.
const currentAddresses = Array.from(serverDescriptions.keys());
const responseAddresses = serverDescription.allHosts;
currentAddresses
.filter((addr: string) => responseAddresses.indexOf(addr) === -1)
.forEach((address: string) => {
serverDescriptions.delete(address);
});
return [checkHasPrimary(serverDescriptions), setName, maxSetVersion, maxElectionId];
}
function updateRsWithPrimaryFromMember(
serverDescriptions: Map<string, ServerDescription>,
serverDescription: ServerDescription,
setName: string | null = null
): TopologyType {
Iif (setName == null) {
// TODO(NODE-3483): should be an appropriate runtime error
throw new 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: Map<string, ServerDescription>,
serverDescription: ServerDescription,
setName: string | null = null
): [TopologyType, string | null] {
const topologyType = TopologyType.ReplicaSetNoPrimary;
setName = setName ?? serverDescription.setName;
if (setName !== serverDescription.setName) {
serverDescriptions.delete(serverDescription.address);
return [topologyType, setName];
}
serverDescription.allHosts.forEach((address: string) => {
if (!serverDescriptions.has(address)) {
serverDescriptions.set(address, new ServerDescription(address));
}
});
if (serverDescription.me && serverDescription.address !== serverDescription.me) {
serverDescriptions.delete(serverDescription.address);
}
return [topologyType, setName];
}
function checkHasPrimary(serverDescriptions: Map<string, ServerDescription>): TopologyType {
for (const serverDescription of serverDescriptions.values()) {
if (serverDescription.type === ServerType.RSPrimary) {
return TopologyType.ReplicaSetWithPrimary;
}
}
return TopologyType.ReplicaSetNoPrimary;
}
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