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feat(cluster): rewrite cluster discovering

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* Discovering process adapted from EventStore scala client
* Use DNS for first discover but also for reconnoctions (the aim is to be able to reconnect even if all nodes have new IP addresses eg. after rolling update in a cloud environment)
* Being able to perform proper unit testing
This commit is contained in:
maniolias
2020-09-14 17:29:58 +02:00
parent eb56e077f9
commit f79a0444f6
12 changed files with 1146 additions and 20 deletions
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43
src/eventStoreConnection.js
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@ -1,9 +1,19 @@
var EventStoreNodeConnection = require('./eventStoreNodeConnection');
var StaticEndpointDiscoverer = require('./core/staticEndpointDiscoverer');
var ClusterDnsEndPointDiscoverer = require('./core/clusterDnsEndPointDiscoverer');
var ClusterDiscoverer = require('./core/cluster/clusterDiscoverer');
var NoopLogger = require('./common/log/noopLogger');
var ensure = require('./common/utils/ensure');
const util = require('util');
const http = require('http');
const dns = require('dns');
const dnsService = {
lookup : util.promisify(dns.lookup),
ADDRCONFIG: dns.ADDRCONFIG,
V4MAPPED: dns.V4MAPPED
};
var defaultConnectionSettings = Object.freeze({
log: new NoopLogger(),
verboseLogging: false,
@ -32,6 +42,7 @@ var defaultConnectionSettings = Object.freeze({
// Cluster Settings
clusterDns: '',
maxDiscoverAttempts: 10,
discoverDelay: 500,
externalGossipPort: 0,
gossipTimeout: 1000
});
@ -80,17 +91,17 @@ function createFromClusterDns(connectionSettings, clusterDns, externalGossipPort
var mergedSettings = merge(defaultConnectionSettings, connectionSettings || {});
var clusterSettings = {
clusterDns: clusterDns,
gossipSeeds: null,
externalGossipPort: externalGossipPort,
seeds: null,
managerExternalHttpPort: externalGossipPort,
maxDiscoverAttempts: mergedSettings.maxDiscoverAttempts,
discoverDelay: mergedSettings.discoverDelay,
gossipTimeout: mergedSettings.gossipTimeout
};
var endPointDiscoverer = new ClusterDnsEndPointDiscoverer(mergedSettings.log,
clusterSettings.clusterDns,
clusterSettings.maxDiscoverAttempts,
clusterSettings.externalGossipPort,
clusterSettings.gossipSeeds,
clusterSettings.gossipTimeout
var endPointDiscoverer = new ClusterDiscoverer(
mergedSettings.log,
clusterSettings,
dnsService,
http
);
return new EventStoreNodeConnection(mergedSettings, clusterSettings, endPointDiscoverer, connectionName);
}
@ -101,17 +112,17 @@ function createFromGossipSeeds(connectionSettings, gossipSeeds, connectionName)
var mergedSettings = merge(defaultConnectionSettings, connectionSettings || {});
var clusterSettings = {
clusterDns: '',
gossipSeeds: gossipSeeds,
seeds: gossipSeeds,
externalGossipPort: 0,
maxDiscoverAttempts: mergedSettings.maxDiscoverAttempts,
discoverDelay: mergedSettings.discoverDelay,
gossipTimeout: mergedSettings.gossipTimeout
};
var endPointDiscoverer = new ClusterDnsEndPointDiscoverer(mergedSettings.log,
clusterSettings.clusterDns,
clusterSettings.maxDiscoverAttempts,
clusterSettings.externalGossipPort,
clusterSettings.gossipSeeds,
clusterSettings.gossipTimeout
var endPointDiscoverer = new ClusterDiscoverer(
mergedSettings.log,
clusterSettings,
dnsService,
http
);
return new EventStoreNodeConnection(mergedSettings, clusterSettings, endPointDiscoverer, connectionName);
}