From 5bc2aaa093aa5528d1ab0f91e6680f9505ea21d3 Mon Sep 17 00:00:00 2001 From: maniolias Date: Thu, 1 Oct 2020 16:27:39 +0200 Subject: [PATCH] refactor: delete unused code --- src/core/clusterDnsEndPointDiscoverer.js | 253 ----------------------- 1 file changed, 253 deletions(-) delete mode 100644 src/core/clusterDnsEndPointDiscoverer.js diff --git a/src/core/clusterDnsEndPointDiscoverer.js b/src/core/clusterDnsEndPointDiscoverer.js deleted file mode 100644 index 8552974..0000000 --- a/src/core/clusterDnsEndPointDiscoverer.js +++ /dev/null @@ -1,253 +0,0 @@ -var http = require('http'); -var util = require('util'); -var dns = require('dns'); -var GossipSeed = require('../gossipSeed'); - -function NodeEndPoints(tcpEndPoint, secureTcpEndPoint) { - if (tcpEndPoint === null && secureTcpEndPoint === null) throw new Error('Both endpoints are null.'); - Object.defineProperties(this, { - tcpEndPoint: { - enumerable: true, - value: tcpEndPoint - }, - secureTcpEndPoint: { - enumerable: true, - value: secureTcpEndPoint - } - }); -} - -function ClusterDnsEndPointDiscoverer(log, clusterDns, maxDiscoverAttempts, managerExternalHttpPort, gossipSeeds, gossipTimeout) { - if (!clusterDns && (!gossipSeeds || gossipSeeds.length === 0)) throw new Error('Both clusterDns and gossipSeeds are null/empty.'); - this._log = log; - this._clusterDns = clusterDns; - this._maxDiscoverAttempts = maxDiscoverAttempts; - this._managerExternalHttpPort = managerExternalHttpPort; - this._gossipSeeds = gossipSeeds; - this._gossipTimeout = gossipTimeout; - this._oldGossip = null; -} - -ClusterDnsEndPointDiscoverer.prototype.discover = function(failedTcpEndPoint) { - var attempt = 1; - var self = this; - function discover(resolve, reject) { - self._discoverEndPoint(failedTcpEndPoint) - .then(function (endPoints) { - if (!endPoints) { - self._log.info(util.format("Discovering attempt %d/%d failed: no candidate found.", attempt, self._maxDiscoverAttempts)); - } - return endPoints; - }) - .catch(function (exc) { - self._log.info(util.format("Discovering attempt %d/%d failed with error: %s.\n%s", attempt, self._maxDiscoverAttempts, exc, exc.stack)); - }) - .then(function (endPoints) { - if (endPoints) return resolve(endPoints); - if (attempt++ === self._maxDiscoverAttempts) { - return reject(new Error('Failed to discover candidate in ' + self._maxDiscoverAttempts + ' attempts.')); - } - setTimeout(discover, 500, resolve, reject); - }); - } - return new Promise(function (resolve, reject) { - discover(resolve, reject); - }); -}; - -/** - * Discover Cluster endpoints - * @param {Object} failedTcpEndPoint - * @returns {Promise.} - * @private - */ -ClusterDnsEndPointDiscoverer.prototype._discoverEndPoint = function (failedTcpEndPoint) { - try { - var mainPromise = this._oldGossip - ? Promise.resolve(this._getGossipCandidatesFromOldGossip(this._oldGossip, failedTcpEndPoint)) - : this._getGossipCandidatesFromDns(); - var self = this; - var j = 0; - return mainPromise.then(function (gossipCandidates) { - var loopPromise = Promise.resolve(); - for (var i = 0; i < gossipCandidates.length; i++) { - loopPromise = loopPromise.then(function (endPoints) { - if (endPoints) return endPoints; - return self._tryGetGossipFrom(gossipCandidates[j++]) - .then(function (gossip) { - if (!gossip || !gossip.members || gossip.members.length === 0) return; - var bestNode = self._tryDetermineBestNode(gossip.members); - if (bestNode) { - self._oldGossip = gossip.members; - return bestNode; - } - }); - }); - } - return loopPromise; - }); - } catch (e) { - return Promise.reject(e); - } -}; - -ClusterDnsEndPointDiscoverer.prototype._getGossipCandidatesFromOldGossip = function (oldGossip, failedTcpEndPoint) { - if (!failedTcpEndPoint) return this._arrangeGossipCandidates(oldGossip); - var gossipCandidates = oldGossip.filter(function(x) { - return !(x.externalTcpPort === failedTcpEndPoint.port && x.externalTcpIp === failedTcpEndPoint.host); - }); - return this._arrangeGossipCandidates(gossipCandidates); -}; - -ClusterDnsEndPointDiscoverer.prototype._arrangeGossipCandidates = function (members) { - var result = new Array(members.length); - var i = -1; - var j = members.length; - for (var k = 0; k < members.length; ++k) - { - if (members[k].state === 'Manager') { - result[--j] = new GossipSeed({host: members[k].externalHttpIp, port: members[k].externalHttpPort}); - } else { - result[++i] = new GossipSeed({host: members[k].externalHttpIp, port: members[k].externalHttpPort}); - } - } - this._randomShuffle(result, 0, i); // shuffle nodes - this._randomShuffle(result, j, members.length - 1); // shuffle managers - return result; -}; - -ClusterDnsEndPointDiscoverer.prototype._getGossipCandidatesFromDns = function () { - var self = this; - return new Promise(function (resolve, reject) { - if (self._gossipSeeds && self._gossipSeeds.length > 0) { - var endpoints = self._gossipSeeds; - self._randomShuffle(endpoints, 0, endpoints.length - 1); - resolve(endpoints); - } else { - const dnsOptions = { - family: 4, - hints: dns.ADDRCONFIG | dns.V4MAPPED, - all: true - }; - dns.lookup(self._clusterDns, dnsOptions, function (err, addresses) { - if (err) { - return reject(err); - } - if (!addresses || addresses.length === 0) { - return reject(new Error('No result from dns lookup for ' + self._clusterDns)); - } - var endpoints = addresses.map(function (x) { - return new GossipSeed({host: x.address, port: self._managerExternalHttpPort}); - }); - resolve(endpoints); - }); - } - }); -}; - -ClusterDnsEndPointDiscoverer.prototype._tryGetGossipFrom = function (endPoint) { - var options = { - host: endPoint.endPoint.host, - port: endPoint.endPoint.port, - path: '/gossip?format=json' - }; - if (endPoint.hostHeader) { - options.headers = {'Host': endPoint.hostHeader}; - } - this._log.info('Try get gossip from', endPoint); - var self = this; - return new Promise(function (resolve, reject) { - var timedout = false; - http.request(options, function (res) { - if (timedout) return; - var result = ''; - if (res.statusCode !== 200) { - self._log.info('Trying to get gossip from', endPoint, 'failed with status code:', res.statusCode); - resolve(); - return; - } - res.on('data', function (chunk) { - result += chunk.toString(); - }); - res.on('end', function () { - try { - result = JSON.parse(result); - } catch (e) { - return resolve(); - } - resolve(result); - }); - }) - .setTimeout(self._gossipTimeout, function () { - self._log.info('Trying to get gossip from', endPoint, 'timed out.'); - timedout = true; - resolve(); - }) - .on('error', function (e) { - if (timedout) return; - self._log.info('Trying to get gossip from', endPoint, 'failed with error:', e); - resolve(); - }) - .end(); - }); -}; - -const VNodeStates = Object.freeze({ - 'Initializing': 0, - 'Unknown': 1, - 'PreReplica': 2, - 'CatchingUp': 3, - 'Clone': 4, - 'Slave': 5, - 'PreMaster': 6, - 'Master': 7, - 'Manager': 8, - 'ShuttingDown': 9, - 'Shutdown': 10 -}); - -ClusterDnsEndPointDiscoverer.prototype._tryDetermineBestNode = function (members) { - var notAllowedStates = [ - 'Manager', - 'ShuttingDown', - 'Shutdown' - ]; - var node = members - .filter(function (x) { - return (x.isAlive && notAllowedStates.indexOf(x.state) === -1); - }) - .sort(function (a, b) { - return VNodeStates[b.state] - VNodeStates[a.state]; - })[0]; - if (!node) - { - //_log.Info("Unable to locate suitable node. Gossip info:\n{0}.", string.Join("\n", members.Select(x => x.ToString()))); - return null; - } - - var normTcp = {host: node.externalTcpIp, port: node.externalTcpPort}; - var secTcp = node.externalSecureTcpPort > 0 - ? {host: node.externalTcpIp, port: node.externalSecureTcpPort} - : null; - this._log.info(util.format("Discovering: found best choice [%j,%j] (%s).", normTcp, secTcp === null ? "n/a" : secTcp, node.state)); - return new NodeEndPoints(normTcp, secTcp); -}; - -function rndNext(min, max) { - min = Math.ceil(min); - max = Math.floor(max); - return Math.floor(Math.random() * (max - min)) + min; -} - -ClusterDnsEndPointDiscoverer.prototype._randomShuffle = function (arr, i, j) { - if (i >= j) return; - for (var k = i; k <= j; ++k) - { - var index = rndNext(k, j + 1); - var tmp = arr[index]; - arr[index] = arr[k]; - arr[k] = tmp; - } -}; - -module.exports = ClusterDnsEndPointDiscoverer; \ No newline at end of file