Proof of concept
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node_modules
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config/*
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!config/*.example.js
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# ConsulTemplate-NodeJS
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Like Consul-template, but different. And written in Node.js.
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# ConsulWatcher
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This is a much simplified version of HashiCorp's Consul-Template, because what it accomplishes is awesome but I really dislike the Go template syntax. All configuration in this version are plain JavaScript.
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It's main purpose is creating output files based on a Consul catalog, much like Consul-Template, but since the update handlers are just JavaScript functions you are free to do whatever you want, like calling a webservice or using a template library.
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module.exports = async (catalog, logger) =>
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{
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// Use catalog parameter to generate output
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};
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const config = {
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onUpdate: [],
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afterUpdate: null
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};
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/*
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Consul agent configuration
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Determines the agent or server which will be queried and
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monitored for the service catalog.
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Recommended to be a local agent connected to the cluster.
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Passed to the initialization of the Node Consul client.
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For all options, see: https://github.com/silas/node-consul#init
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*/
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config.consul = {
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host: 'localhost'
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}
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/*
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Logging
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See: https://github.com/winstonjs/winston#transports
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*/
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const winston = require('winston');
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config.logging = {
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transports: [
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new winston.transports.Console({
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level: 'debug',
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timestamp: true,
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format: winston.format.combine(
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winston.format.colorize(),
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winston.format.simple()
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)
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})
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]
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};
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/*
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onUpdate handlers
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When a change occurs in the Consul catalog, each handler is called in order.
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Callbacks may return a Promise. Note that when using multiple handlers,
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they are not awaited immediately but at the end using Promise.all(), which
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means the handlers effectively run in parallel.
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The catalog parameter has a services property to enumerate the registered
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services. See the Readme for the documentation of the ConsulCatalog class.
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For more information about a service, including it's address and health,
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an additional call to Consul is required. Calling these methods will result
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in the service being watched for changes as well.
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The second parameter is a reference to the Winston logger instance.
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*/
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const fs = require('fs').promises;
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config.onUpdate.push((catalog, logger) =>
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{
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// Use catalog parameter to generate output
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let output = '';
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for (const service of catalog.services)
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{
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output +=
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`Service: ${service.name}
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Tags: ${JSON.stringify(service.tags)}
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Address: ${await service.getAddress()}
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Port: ${await service.getPort()}
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`;
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};
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await fs.writeFile('example-output.txt', output);
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});
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/*
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afterUpdate handler
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This is a single handler which is called after all the onUpdate handlers
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have finished, including any Promises returned.
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It can be used for example to reload a proxy server after the configuration
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changes have been written in onUpdate.
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*/
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config.afterUpdate = (catalog, logger) =>
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{
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// Call a reload script
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}
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module.exports = config;
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[Unit]
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Description=ConsulWatcher
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Requires=network-online.target
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After=network-online.target
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[Service]
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Restart=on-failure
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ExecStart=/usr/local/bin/node /srv/consulwatcher/index.js
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KillSignal=SIGINT
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[Install]
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WantedBy=multi-user.target
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const ConsulCatalog = require('./lib/consulcatalog');
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const logger = require('./lib/logger');
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const config = require('./config');
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const catalog = new ConsulCatalog(logger, config);
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// TODO detect if the connection is down for too long, allow a custom notification to be sent
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// TODO provide a way to easily switch between configs, for multiple environments
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const debounce = require('debounce');
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// TODO support multiple instances of the same service name
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function sameTags(a, b)
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{
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if (a.length != b.length)
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return false;
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for (let i = 0, l = a.length; i < l; i++)
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{
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if (!b.includes(a[i]))
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return false;
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}
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return true;
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}
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class ConsulCatalog
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{
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constructor(logger, config)
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{
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const self = this;
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self.rawData = null;
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// Always use promises, the code relies on it
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config.consul.promisify = true;
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self._config = config;
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self._logger = logger;
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self._consul = require('consul')(config.consul);
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self._services = [];
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self._updating = false;
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self._requireUpdate = false;
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self._debouncedUpdate = null;
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this._logger.info('Starting watch for catalog service list');
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self._watch = self._consul.watch({
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method: self._consul.catalog.service.list,
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options: {}
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});
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self._watch.on('change', (data, res) =>
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{
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if (self._applyCatalogData(data))
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self._doUpdate();
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});
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self._watch.on('error', err =>
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{
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// TODO better exception handling
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self._logger.error('Error while watching catalog service list', err);
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});
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}
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get services()
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{
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return this._services;
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}
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serviceByName(name)
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{
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return this._services.find(service => service.name == name) || null;
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}
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servicesByTag(tag)
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{
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return this._services.filter(service => service.tags.includes(tag));
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}
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servicesByTags(tags)
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{
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return this._services.filter(service => tags.every(tag => service.tags.includes(tag)));
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}
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_applyCatalogData(data)
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{
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const self = this;
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self.rawData = data;
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let changed = false;
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// Remove services that no longer exist
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const serviceNames = Object.keys(data);
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self._services = self._services.filter(service =>
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{
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const serviceIndex = serviceNames.indexOf(service.name);
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if (serviceIndex == -1)
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{
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// Previously detected service no longer appears in Consul, remove
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// any watches that may be present and remove it from the list
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service._delete();
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changed = true;
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return false;
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}
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if (service._applyCatalogData(data[service.name]))
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changed = true;
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// Remove from serviceNames to indicate it has already been applied
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serviceNames.splice(serviceIndex, 1);
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return true;
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});
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// All remaining entries in serviceNames are new
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serviceNames.forEach(name =>
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{
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self._logger.debug(`Found new service: ${name}`)
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self._services.push(new ConsulService(self, name, data[name]));
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changed = true;
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});
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return changed;
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}
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_doUpdate()
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{
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const self = this;
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if (self._updating)
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{
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self._logger.debug('Update already running, will re-run after it is finished');
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self._requireUpdate = true;
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return;
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}
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if (self._debouncedUpdate == null)
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{
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self._debouncedUpdate = debounce(() =>
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{
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self._updating = true;
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self._requireUpdate = false;
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self._logger.info('Running update handlers');
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const handlerPromises = [];
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self._config.onUpdate.forEach(handler =>
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{
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const handlerPromise = Promise.resolve(handler(self, self._logger));
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handlerPromises.push(handlerPromise);
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});
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Promise.all(handlerPromises)
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.then(() =>
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{
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self._logger.info('Running after-update handler');
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Promise.resolve(self._config.afterUpdate(self, self._logger))
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.then(() =>
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{
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self._logger.info('Update completed');
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self._updating = false;
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if (self._requireUpdate)
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{
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self._logger.debug('Update re-run requested');
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self._doUpdate();
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}
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});
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});
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}, 500);
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}
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self._debouncedUpdate();
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}
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}
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class ConsulService
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{
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constructor(catalog, name, tags)
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{
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this._catalog = catalog;
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this._consul = catalog._consul;
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this._logger = catalog._logger;
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this._watch = null;
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this._rawData = null;
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this._rawDataPromise = null;
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this.name = name;
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this.tags = tags;
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}
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async getAddress()
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{
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var rawData;
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try
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{
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rawData = await this._getRawData();
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}
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catch(e)
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{
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// TODO better exception handling
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this._logger.error('Error while retrieving service status', err);
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return null;
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}
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if (rawData.length == 0)
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return null;
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if (rawData[0].Service.Address != '')
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return rawData[0].Service.Address;
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return rawData[0].Node.Address;
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}
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async getPort()
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{
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var rawData;
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try
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{
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rawData = await this._getRawData();
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}
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catch(e)
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{
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// TODO better exception handling
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this._logger.error('Error while retrieving service status', err);
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return null;
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}
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return rawData.length > 0 ? rawData[0].Service.Port : null;
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}
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// TODO getHealth
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_getRawData()
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{
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const self = this;
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if (self._rawDataPromise !== null)
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return self._rawDataPromise;
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// Get status information for the service and start watching it
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self._rawDataPromise = new Promise((resolve, reject) =>
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{
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let firstResponse = true;
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self._logger.debug(`Starting watch for service: ${this.name}`);
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self._watch = self._consul.watch({
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method: self._consul.health.service,
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options: { service: self.name }
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});
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self._watch.on('change', (data, res) =>
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{
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if (self._applyHealthData(data))
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self._catalog._doUpdate();
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if (firstResponse)
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{
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firstResponse = false;
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resolve(self._rawData);
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}
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});
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self._watch.on('error', err =>
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{
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// TODO better error handling
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self._logger.error(`Error while watching status for service: ${this.name}`, err);
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if (firstResponse)
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{
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firstResponse = false;
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reject(err);
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}
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// Try again the next time
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self._rawDataPromise = null;
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});
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});
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return self._rawDataPromise;
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}
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_delete()
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{
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if (this._watch !== null)
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{
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this._logger.debug(`Stopping watch for service: ${this.name}`);
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this._watch.end();
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}
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}
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_applyCatalogData(data)
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{
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if (sameTags(this.tags, data))
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return false;
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this._logger.info(`${this.name}: tags changed from ${JSON.stringify(this.tags)} to ${JSON.stringify(data)}`);
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this.tags = data;
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return true;
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}
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_applyHealthData(data)
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{
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if (data == this._rawData)
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return false;
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const isUpdate = this._rawData != null;
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this._rawData = data;
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// If this is the first time we've received data, it is guaranteed to be the result of
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// an update handler requesting this data and the handlers do not need to be called again.
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return isUpdate;
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}
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}
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module.exports = ConsulCatalog;
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@ -0,0 +1,9 @@
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const winston = require('winston');
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const config = require('../config');
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// TODO make configurable
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let logger = winston.createLogger({
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transports: config.logging.transports,
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});
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module.exports = logger;
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@ -0,0 +1,282 @@
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{
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"name": "consulwatcher",
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"version": "1.0.0",
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"lockfileVersion": 1,
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"requires": true,
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"dependencies": {
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"@dabh/diagnostics": {
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"version": "2.0.2",
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"resolved": "https://registry.npmjs.org/@dabh/diagnostics/-/diagnostics-2.0.2.tgz",
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"integrity": "sha512-+A1YivoVDNNVCdfozHSR8v/jyuuLTMXwjWuxPFlFlUapXoGc+Gj9mDlTDDfrwl7rXCl2tNZ0kE8sIBO6YOn96Q==",
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||||
"requires": {
|
||||
"colorspace": "1.1.x",
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||||
"enabled": "2.0.x",
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||||
"kuler": "^2.0.0"
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}
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},
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"async": {
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||||
"version": "3.2.0",
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||||
"resolved": "https://registry.npmjs.org/async/-/async-3.2.0.tgz",
|
||||
"integrity": "sha512-TR2mEZFVOj2pLStYxLht7TyfuRzaydfpxr3k9RpHIzMgw7A64dzsdqCxH1WJyQdoe8T10nDXd9wnEigmiuHIZw=="
|
||||
},
|
||||
"color": {
|
||||
"version": "3.0.0",
|
||||
"resolved": "https://registry.npmjs.org/color/-/color-3.0.0.tgz",
|
||||
"integrity": "sha512-jCpd5+s0s0t7p3pHQKpnJ0TpQKKdleP71LWcA0aqiljpiuAkOSUFN/dyH8ZwF0hRmFlrIuRhufds1QyEP9EB+w==",
|
||||
"requires": {
|
||||
"color-convert": "^1.9.1",
|
||||
"color-string": "^1.5.2"
|
||||
}
|
||||
},
|
||||
"color-convert": {
|
||||
"version": "1.9.3",
|
||||
"resolved": "https://registry.npmjs.org/color-convert/-/color-convert-1.9.3.tgz",
|
||||
"integrity": "sha512-QfAUtd+vFdAtFQcC8CCyYt1fYWxSqAiK2cSD6zDB8N3cpsEBAvRxp9zOGg6G/SHHJYAT88/az/IuDGALsNVbGg==",
|
||||
"requires": {
|
||||
"color-name": "1.1.3"
|
||||
}
|
||||
},
|
||||
"color-name": {
|
||||
"version": "1.1.3",
|
||||
"resolved": "https://registry.npmjs.org/color-name/-/color-name-1.1.3.tgz",
|
||||
"integrity": "sha1-p9BVi9icQveV3UIyj3QIMcpTvCU="
|
||||
},
|
||||
"color-string": {
|
||||
"version": "1.5.3",
|
||||
"resolved": "https://registry.npmjs.org/color-string/-/color-string-1.5.3.tgz",
|
||||
"integrity": "sha512-dC2C5qeWoYkxki5UAXapdjqO672AM4vZuPGRQfO8b5HKuKGBbKWpITyDYN7TOFKvRW7kOgAn3746clDBMDJyQw==",
|
||||
"requires": {
|
||||
"color-name": "^1.0.0",
|
||||
"simple-swizzle": "^0.2.2"
|
||||
}
|
||||
},
|
||||
"colors": {
|
||||
"version": "1.4.0",
|
||||
"resolved": "https://registry.npmjs.org/colors/-/colors-1.4.0.tgz",
|
||||
"integrity": "sha512-a+UqTh4kgZg/SlGvfbzDHpgRu7AAQOmmqRHJnxhRZICKFUT91brVhNNt58CMWU9PsBbv3PDCZUHbVxuDiH2mtA=="
|
||||
},
|
||||
"colorspace": {
|
||||
"version": "1.1.2",
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|
@ -0,0 +1,29 @@
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}
|
||||
Loading…
Reference in New Issue