node-eventstore-client
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A port of the EventStore .Net ClientAPI to Node.js
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<title>JSDoc: Source: core/cluster/clusterDiscoverer.js</title>
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<h1 class="page-title">Source: core/cluster/clusterDiscoverer.js</h1>
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<pre class="prettyprint source linenums"><code>const ClusterInfo = require('./clusterInfo');
const GossipSeed = require('../../gossipSeed');
const NodeEndPoints = require('./nodeEndpoints');
const shuffle = require('../../common/utils/shuffle');
function wait(ms) {
return new Promise(resolve => setTimeout(resolve, ms));
}
/**
* ClusterDiscoverer
* @constructor
* @class
* @param {Logger} log - Logger instance
* @param {Object} settings - Settings object
* @param {Object} dnsService - DNS service to perform DNS lookup
* @param {Object} httpService - HTTP service to perform http requests
*/
function ClusterDiscoverer(log, settings, dnsService, httpService) {
if (!settings.clusterDns && (!settings.seeds || settings.seeds.length === 0))
throw new Error('Both clusterDns and seeds are null/empty.');
this._log = log;
this._settings = settings;
this._dnsService = dnsService;
this._httpService = httpService;
}
/**
* Discover Cluster endpoints
* @param {Object} failedTcpEndPoint - The failed TCP endpoint which were used by the handler
* @returns {Promise.<NodeEndPoints>}
*/
ClusterDiscoverer.prototype.discover = async function (failedTcpEndPoint) {
let attempts = 0;
while (attempts++ < this._settings.maxDiscoverAttempts) {
try {
const candidates = await this._getGossipCandidates(this._settings.managerExternalHttpPort);
const gossipSeeds = candidates.filter(
(candidate) =>
!failedTcpEndPoint ||
!(candidate.endPoint.host === failedTcpEndPoint.host && candidate.endPoint.port === failedTcpEndPoint.port)
);
let gossipSeedsIndex = 0;
let clusterInfo;
do {
try {
clusterInfo = await this._clusterInfo(gossipSeeds[gossipSeedsIndex], this._settings.gossipTimeout);
if (!clusterInfo.bestNode) {
this._log.info(
`Discovering attempt ${attempts}/${this._settings.maxDiscoverAttempts} failed: no candidate found.`
);
continue;
}
} catch (err) {}
} while (++gossipSeedsIndex < gossipSeeds.length);
if (clusterInfo) {
return NodeEndPoints.createFromGossipMember(clusterInfo.bestNode);
}
} catch (err) {
this._log.info(
`Discovering attempt ${attempts}/${this._settings.maxDiscoverAttempts} failed with error: ${err}.\n${err.stack}`
);
}
await wait(this._settings.discoverDelay);
}
throw new Error(`Failed to discover candidate in ${this._settings.maxDiscoverAttempts} attempts.`);
};
/**
* Get gossip candidates either from DNS or from gossipSeeds settings
* @private
* @param {Number} managerExternalHttpPort - Http port of the manager (or the http port of the node for OSS clusters)
* @returns {Promise.<GossipSeed[]>}
*/
ClusterDiscoverer.prototype._getGossipCandidates = async function (managerExternalHttpPort) {
const gossipSeeds =
this._settings.seeds && this._settings.seeds.length > 0
? this._settings.seeds
: (await this._resolveDns(this._settings.clusterDns)).map(
(address) => new GossipSeed({ host: address, port: managerExternalHttpPort }, address, this._settings.clusterDns)
);
return shuffle(gossipSeeds);
};
/**
* Resolve the cluster DNS discovery address to retrieve belonging ip addresses
* @private
* @param {String} clusterDns - Cluster DNS discovery address
* @returns {Promise.<String[]>}
*/
ClusterDiscoverer.prototype._resolveDns = async function (clusterDns) {
const dnsOptions = {
family: 4,
hints: this._dnsService.ADDRCONFIG | this._dnsService.V4MAPPED,
all: true,
};
const result = await this._dnsService.lookup(clusterDns, dnsOptions);
if (!result || result.length === 0) {
throw new Error(`No result from dns lookup for ${clusterDns}`);
}
return result.map((address) => address.address);
};
/**
* Get cluster informations (gossip members)
* @param {GossipSeed} candidate - candidate to get informations from
* @param {Number} timeout - timeout for the http request
* @returns {Promise.<ClusterInfo>}
*/
ClusterDiscoverer.prototype._clusterInfo = async function (candidate, timeout) {
var self = this;
return new Promise((resolve, reject) => {
const options = {
host: candidate.endPoint.host,
port: candidate.endPoint.port,
path: '/gossip?format=json',
timeout: timeout,
rejectUnauthorized: self._settings.rejectUnauthorized
};
if (candidate.hostHeader) {
options.headers = {
Host: candidate.hostHeader,
};
}
const request = this._httpService.request(options, (res) => {
if (res.statusCode !== 200) {
this._log.info('Trying to get gossip from', candidate, 'failed with status code:', res.statusCode);
reject(new Error(`Gossip candidate returns a ${res.statusCode} error`));
return;
}
let result = '';
res.on('data', (chunk) => {
result += chunk.toString();
});
res.on('end', function () {
try {
result = JSON.parse(result);
} catch (e) {
reject(new Error('Unable to parse gossip response'));
}
resolve(new ClusterInfo(result.members));
});
});
request.setTimeout(timeout);
request.on('timeout', () => {
this._log.info('Trying to get gossip from', candidate, 'timed out.');
request.destroy();
reject(new Error('Connection to gossip timed out'));
});
request.on('error', (error) => {
this._log.info('Trying to get gossip from', candidate, 'errored', error);
request.destroy();
reject(new Error('Connection to gossip errored'));
});
request.end();
});
};
module.exports = ClusterDiscoverer;
</code></pre>
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