server_description.js
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"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.compareTopologyVersion = exports.parseServerType = exports.ServerDescription = void 0;
const bson_1 = require("../bson");
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) {
var _a, _b, _c, _d, _e, _f, _g, _h, _j, _k, _l, _m;
if (typeof address === 'string') {
this._hostAddress = new utils_1.HostAddress(address);
this.address = this._hostAddress.toString();
}
else {
this._hostAddress = address;
this.address = this._hostAddress.toString();
}
this.type = parseServerType(hello, options);
this.hosts = (_b = (_a = hello === null || hello === void 0 ? void 0 : hello.hosts) === null || _a === void 0 ? void 0 : _a.map((host) => host.toLowerCase())) !== null && _b !== void 0 ? _b : [];
this.passives = (_d = (_c = hello === null || hello === void 0 ? void 0 : hello.passives) === null || _c === void 0 ? void 0 : _c.map((host) => host.toLowerCase())) !== null && _d !== void 0 ? _d : [];
this.arbiters = (_f = (_e = hello === null || hello === void 0 ? void 0 : hello.arbiters) === null || _e === void 0 ? void 0 : _e.map((host) => host.toLowerCase())) !== null && _f !== void 0 ? _f : [];
this.tags = (_g = hello === null || hello === void 0 ? void 0 : hello.tags) !== null && _g !== void 0 ? _g : {};
this.minWireVersion = (_h = hello === null || hello === void 0 ? void 0 : hello.minWireVersion) !== null && _h !== void 0 ? _h : 0;
this.maxWireVersion = (_j = hello === null || hello === void 0 ? void 0 : hello.maxWireVersion) !== null && _j !== void 0 ? _j : 0;
this.roundTripTime = (_k = options === null || options === void 0 ? void 0 : options.roundTripTime) !== null && _k !== void 0 ? _k : -1;
this.lastUpdateTime = (0, utils_1.now)();
this.lastWriteDate = (_m = (_l = hello === null || hello === void 0 ? void 0 : hello.lastWrite) === null || _l === void 0 ? void 0 : _l.lastWriteDate) !== null && _m !== void 0 ? _m : 0;
if (options === null || options === void 0 ? void 0 : options.topologyVersion) {
this.topologyVersion = options.topologyVersion;
}
else if (hello === null || hello === void 0 ? void 0 : hello.topologyVersion) {
this.topologyVersion = hello.topologyVersion;
}
if (options === null || options === void 0 ? void 0 : options.error) {
this.error = options.error;
}
if (hello === null || hello === void 0 ? void 0 : hello.primary) {
this.primary = hello.primary;
}
if (hello === null || hello === void 0 ? void 0 : hello.me) {
this.me = hello.me.toLowerCase();
}
if (hello === null || hello === void 0 ? void 0 : hello.setName) {
this.setName = hello.setName;
}
if (hello === null || hello === void 0 ? void 0 : hello.setVersion) {
this.setVersion = hello.setVersion;
}
if (hello === null || hello === void 0 ? void 0 : hello.electionId) {
this.electionId = hello.electionId;
}
if (hello === null || hello === void 0 ? void 0 : hello.logicalSessionTimeoutMinutes) {
this.logicalSessionTimeoutMinutes = hello.logicalSessionTimeoutMinutes;
}
if (hello === null || hello === void 0 ? void 0 : hello.$clusterTime) {
this.$clusterTime = hello.$clusterTime;
}
}
get hostAddress() {
if (this._hostAddress)
return this._hostAddress;
else
return new utils_1.HostAddress(this.address);
}
get allHosts() {
return this.hosts.concat(this.arbiters).concat(this.passives);
}
/** Is this server available for reads*/
get isReadable() {
return this.type === common_1.ServerType.RSSecondary || this.isWritable;
}
/** Is this server data bearing */
get isDataBearing() {
return DATA_BEARING_SERVER_TYPES.has(this.type);
}
/** Is this server available for writes */
get isWritable() {
return WRITABLE_SERVER_TYPES.has(this.type);
}
get host() {
const chopLength = `:${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 {@link https://github.com/mongodb/specifications/blob/master/source/server-discovery-and-monitoring/server-discovery-and-monitoring.rst#serverdescription|SDAM spec}
*/
equals(other) {
const topologyVersionsEqual = this.topologyVersion === other.topologyVersion ||
compareTopologyVersion(this.topologyVersion, other.topologyVersion) === 0;
const electionIdsEqual = this.electionId && other.electionId
? other.electionId && this.electionId.equals(other.electionId)
: this.electionId === other.electionId;
return (other != null &&
(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 === null || options === void 0 ? void 0 : 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;
}
exports.parseServerType = parseServerType;
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.
*
* @returns A negative number if `lhs` is older than `rhs`; positive if `lhs` is newer than `rhs`; 0 if they are equivalent.
*/
function compareTopologyVersion(lhs, rhs) {
if (lhs == null || rhs == null) {
return -1;
}
if (lhs.processId.equals(rhs.processId)) {
// tests mock counter as just number, but in a real situation counter should always be a Long
const lhsCounter = bson_1.Long.isLong(lhs.counter) ? lhs.counter : bson_1.Long.fromNumber(lhs.counter);
const rhsCounter = bson_1.Long.isLong(rhs.counter) ? lhs.counter : bson_1.Long.fromNumber(rhs.counter);
return lhsCounter.compare(rhsCounter);
}
return -1;
}
exports.compareTopologyVersion = compareTopologyVersion;
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