refactor: delete unused code
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maniolias
parent
401f6c3190
commit
5bc2aaa093
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@ -1,253 +0,0 @@
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var http = require('http');
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var util = require('util');
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var dns = require('dns');
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var GossipSeed = require('../gossipSeed');
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function NodeEndPoints(tcpEndPoint, secureTcpEndPoint) {
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if (tcpEndPoint === null && secureTcpEndPoint === null) throw new Error('Both endpoints are null.');
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Object.defineProperties(this, {
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tcpEndPoint: {
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enumerable: true,
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value: tcpEndPoint
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},
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secureTcpEndPoint: {
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enumerable: true,
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value: secureTcpEndPoint
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}
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});
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}
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function ClusterDnsEndPointDiscoverer(log, clusterDns, maxDiscoverAttempts, managerExternalHttpPort, gossipSeeds, gossipTimeout) {
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if (!clusterDns && (!gossipSeeds || gossipSeeds.length === 0)) throw new Error('Both clusterDns and gossipSeeds are null/empty.');
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this._log = log;
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this._clusterDns = clusterDns;
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this._maxDiscoverAttempts = maxDiscoverAttempts;
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this._managerExternalHttpPort = managerExternalHttpPort;
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this._gossipSeeds = gossipSeeds;
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this._gossipTimeout = gossipTimeout;
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this._oldGossip = null;
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}
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ClusterDnsEndPointDiscoverer.prototype.discover = function(failedTcpEndPoint) {
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var attempt = 1;
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var self = this;
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function discover(resolve, reject) {
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self._discoverEndPoint(failedTcpEndPoint)
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.then(function (endPoints) {
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if (!endPoints) {
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self._log.info(util.format("Discovering attempt %d/%d failed: no candidate found.", attempt, self._maxDiscoverAttempts));
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}
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return endPoints;
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})
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.catch(function (exc) {
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self._log.info(util.format("Discovering attempt %d/%d failed with error: %s.\n%s", attempt, self._maxDiscoverAttempts, exc, exc.stack));
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})
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.then(function (endPoints) {
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if (endPoints) return resolve(endPoints);
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if (attempt++ === self._maxDiscoverAttempts) {
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return reject(new Error('Failed to discover candidate in ' + self._maxDiscoverAttempts + ' attempts.'));
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}
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setTimeout(discover, 500, resolve, reject);
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});
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}
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return new Promise(function (resolve, reject) {
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discover(resolve, reject);
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});
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};
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/**
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* Discover Cluster endpoints
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* @param {Object} failedTcpEndPoint
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* @returns {Promise.<NodeEndPoints>}
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* @private
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*/
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ClusterDnsEndPointDiscoverer.prototype._discoverEndPoint = function (failedTcpEndPoint) {
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try {
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var mainPromise = this._oldGossip
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? Promise.resolve(this._getGossipCandidatesFromOldGossip(this._oldGossip, failedTcpEndPoint))
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: this._getGossipCandidatesFromDns();
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var self = this;
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var j = 0;
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return mainPromise.then(function (gossipCandidates) {
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var loopPromise = Promise.resolve();
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for (var i = 0; i < gossipCandidates.length; i++) {
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loopPromise = loopPromise.then(function (endPoints) {
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if (endPoints) return endPoints;
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return self._tryGetGossipFrom(gossipCandidates[j++])
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.then(function (gossip) {
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if (!gossip || !gossip.members || gossip.members.length === 0) return;
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var bestNode = self._tryDetermineBestNode(gossip.members);
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if (bestNode) {
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self._oldGossip = gossip.members;
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return bestNode;
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}
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});
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});
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}
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return loopPromise;
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});
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} catch (e) {
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return Promise.reject(e);
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}
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};
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ClusterDnsEndPointDiscoverer.prototype._getGossipCandidatesFromOldGossip = function (oldGossip, failedTcpEndPoint) {
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if (!failedTcpEndPoint) return this._arrangeGossipCandidates(oldGossip);
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var gossipCandidates = oldGossip.filter(function(x) {
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return !(x.externalTcpPort === failedTcpEndPoint.port && x.externalTcpIp === failedTcpEndPoint.host);
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});
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return this._arrangeGossipCandidates(gossipCandidates);
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};
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ClusterDnsEndPointDiscoverer.prototype._arrangeGossipCandidates = function (members) {
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var result = new Array(members.length);
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var i = -1;
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var j = members.length;
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for (var k = 0; k < members.length; ++k)
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{
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if (members[k].state === 'Manager') {
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result[--j] = new GossipSeed({host: members[k].externalHttpIp, port: members[k].externalHttpPort});
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} else {
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result[++i] = new GossipSeed({host: members[k].externalHttpIp, port: members[k].externalHttpPort});
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}
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}
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this._randomShuffle(result, 0, i); // shuffle nodes
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this._randomShuffle(result, j, members.length - 1); // shuffle managers
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return result;
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};
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ClusterDnsEndPointDiscoverer.prototype._getGossipCandidatesFromDns = function () {
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var self = this;
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return new Promise(function (resolve, reject) {
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if (self._gossipSeeds && self._gossipSeeds.length > 0) {
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var endpoints = self._gossipSeeds;
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self._randomShuffle(endpoints, 0, endpoints.length - 1);
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resolve(endpoints);
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} else {
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const dnsOptions = {
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family: 4,
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hints: dns.ADDRCONFIG | dns.V4MAPPED,
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all: true
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};
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dns.lookup(self._clusterDns, dnsOptions, function (err, addresses) {
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if (err) {
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return reject(err);
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}
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if (!addresses || addresses.length === 0) {
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return reject(new Error('No result from dns lookup for ' + self._clusterDns));
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}
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var endpoints = addresses.map(function (x) {
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return new GossipSeed({host: x.address, port: self._managerExternalHttpPort});
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});
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resolve(endpoints);
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});
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}
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});
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};
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ClusterDnsEndPointDiscoverer.prototype._tryGetGossipFrom = function (endPoint) {
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var options = {
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host: endPoint.endPoint.host,
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port: endPoint.endPoint.port,
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path: '/gossip?format=json'
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};
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if (endPoint.hostHeader) {
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options.headers = {'Host': endPoint.hostHeader};
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}
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this._log.info('Try get gossip from', endPoint);
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var self = this;
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return new Promise(function (resolve, reject) {
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var timedout = false;
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http.request(options, function (res) {
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if (timedout) return;
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var result = '';
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if (res.statusCode !== 200) {
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self._log.info('Trying to get gossip from', endPoint, 'failed with status code:', res.statusCode);
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resolve();
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return;
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}
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res.on('data', function (chunk) {
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result += chunk.toString();
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});
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res.on('end', function () {
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try {
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result = JSON.parse(result);
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} catch (e) {
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return resolve();
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}
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resolve(result);
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});
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})
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.setTimeout(self._gossipTimeout, function () {
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self._log.info('Trying to get gossip from', endPoint, 'timed out.');
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timedout = true;
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resolve();
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})
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.on('error', function (e) {
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if (timedout) return;
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self._log.info('Trying to get gossip from', endPoint, 'failed with error:', e);
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resolve();
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})
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.end();
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});
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};
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const VNodeStates = Object.freeze({
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'Initializing': 0,
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'Unknown': 1,
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'PreReplica': 2,
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'CatchingUp': 3,
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'Clone': 4,
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'Slave': 5,
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'PreMaster': 6,
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'Master': 7,
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'Manager': 8,
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'ShuttingDown': 9,
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'Shutdown': 10
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});
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ClusterDnsEndPointDiscoverer.prototype._tryDetermineBestNode = function (members) {
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var notAllowedStates = [
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'Manager',
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'ShuttingDown',
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'Shutdown'
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];
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var node = members
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.filter(function (x) {
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return (x.isAlive && notAllowedStates.indexOf(x.state) === -1);
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})
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.sort(function (a, b) {
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return VNodeStates[b.state] - VNodeStates[a.state];
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})[0];
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if (!node)
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{
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//_log.Info("Unable to locate suitable node. Gossip info:\n{0}.", string.Join("\n", members.Select(x => x.ToString())));
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return null;
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}
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var normTcp = {host: node.externalTcpIp, port: node.externalTcpPort};
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var secTcp = node.externalSecureTcpPort > 0
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? {host: node.externalTcpIp, port: node.externalSecureTcpPort}
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: null;
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this._log.info(util.format("Discovering: found best choice [%j,%j] (%s).", normTcp, secTcp === null ? "n/a" : secTcp, node.state));
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return new NodeEndPoints(normTcp, secTcp);
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};
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function rndNext(min, max) {
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min = Math.ceil(min);
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max = Math.floor(max);
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return Math.floor(Math.random() * (max - min)) + min;
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}
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ClusterDnsEndPointDiscoverer.prototype._randomShuffle = function (arr, i, j) {
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if (i >= j) return;
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for (var k = i; k <= j; ++k)
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{
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var index = rndNext(k, j + 1);
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var tmp = arr[index];
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arr[index] = arr[k];
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arr[k] = tmp;
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}
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};
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module.exports = ClusterDnsEndPointDiscoverer;
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