From 89b2aa4b1715c31ce8ac84beefce6cddc1ac7f16 Mon Sep 17 00:00:00 2001 From: James Simpson Date: Wed, 14 Feb 2018 09:05:28 -0600 Subject: [PATCH 1/6] Refactor codebase with ES6 and change minimum node to 6.4.0 --- .gitignore | 1 + index.js | 2 +- lib/democracy.js | 670 +++++++++++++++++++++++------------------------ package.json | 2 +- 4 files changed, 325 insertions(+), 350 deletions(-) create mode 100644 .gitignore diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..bca51b3 --- /dev/null +++ b/.gitignore @@ -0,0 +1 @@ +node_modules/ diff --git a/index.js b/index.js index 5d63df8..1fed089 100644 --- a/index.js +++ b/index.js @@ -1 +1 @@ -module.exports = require('./lib/democracy.js'); \ No newline at end of file +module.exports = require('./lib/democracy.js'); diff --git a/lib/democracy.js b/lib/democracy.js index ac3cd82..0a02b21 100644 --- a/lib/democracy.js +++ b/lib/democracy.js @@ -1,419 +1,393 @@ /** * democracy.js - * Copyright (c) 2017, GoldFire Studios, Inc. + * Copyright (c) 2016 - 2018, GoldFire Studios, Inc. * http://goldfirestudios.com */ -'use strict'; +const uuid = require('uuid'); +const dgram = require('dgram'); +const {EventEmitter} = require('events'); +const {StringDecoder} = require('string_decoder'); -var dgram = require('dgram'); -var EventEmitter = require('events').EventEmitter; -var util = require('util'); -var StringDecoder = require('string_decoder').StringDecoder; -var decoder = new StringDecoder('utf8'); -var uuid = require('uuid'); +// Create the string decoder. +const decoder = new StringDecoder('utf8'); /** - * Setup the base Democracy class so that we can add onto the prototype. - * @param {Object} options User-defined options. + * Setup the base Democracy class that handles all of the methods. */ -var Democracy = function(options) { - EventEmitter.call(this); - this.init(options); -}; +class Democracy extends EventEmitter { + /** + * Initialize a new democracy with the given options. + * @param {Object} options User-defined options. + */ + constructor(options = {}) { + super(); + + this._nodes = {}; + + // Merge the passed options with the defaults. + this.options = { + interval: options.interval || 1000, + timeout: options.timeout || 3000, + source: options.source || '0.0.0.0:12345', + peers: options.peers || [], + weight: options.weight || Math.random() * Date.now(), + id: options.id || uuid.v4(), + }; + + // Remove the source from the peers. + const sourceIndex = this.options.peers.indexOf(this.options.source); + if (sourceIndex >= 0) { + this.options.peers.splice(sourceIndex, 1); + } -util.inherits(Democracy, EventEmitter); + // Better format the source and peers for speed. + this.options.source = this.options.source.split(':'); + for (let i = 0; i < this.options.peers.length; i += 1) { + this.options.peers[i] = this.options.peers[i].split(':'); + } -/** - * Initialize a new democracy with the given options. - * @param {Object} options User-defined options. - */ -Democracy.prototype.init = function(options) { - var self = this; - - self._nodes = {}; - - // Merge the passed options with the defaults. - options = options || {}; - self.options = { - interval: options.interval || 1000, - timeout: options.timeout || 3000, - source: options.source || '0.0.0.0:12345', - peers: options.peers || [], - weight: options.weight || Math.random() * Date.now(), - id: options.id || uuid.v4() - }; - - // Remove the source from the peers. - var sourceIndex = self.options.peers.indexOf(self.options.source); - if (sourceIndex >= 0) { - self.options.peers.splice(sourceIndex, 1); + // Generate the details about this node to be sent between nodes. + this._id = this.options.id; + this._weight = this.options.weight; + this._state = 'citizen'; + + // Setup the UDP socket to listen on. + this.socket = dgram.createSocket({type: 'udp4', reuseAddr: true}); + + this.start(); } - // Better format the source and peers for speed. - self.options.source = self.options.source.split(':'); - for (var i=0; i { + // Listen for messages on this port. + this.socket.on('message', (msg) => { + this.processEvent(msg); + }); + + // Start sending 'hello' messages to the other nodes. + this.hello(); + }); + + // Run an election after two intervals if we still don't have a leader. + setTimeout(() => { + // Check if we have a leader. + let haveLeader = false; + Object.keys(this._nodes).forEach((id) => { + if (this._nodes[id].state === 'leader') { + haveLeader = true; + } + }); + + if (!haveLeader && this._state !== 'leader') { + this.holdElections(); + } + }, this.options.interval * 2); + + return this; } - // Generate the details about this node to be sent between nodes. - self._id = self.options.id; - self._weight = self.options.weight; - self._state = 'citizen'; + /** + * Run the `hello` interval to send out the heartbeats. + * @return {Democracy} + */ + hello() { + // Send a hello message and then check the other nodes. + const sendHello = () => { + this.send('hello'); + this.check(); + }; - // Setup the UDP socket to listen on. - self.socket = dgram.createSocket({type: 'udp4', reuseAddr: true}); + // Schedule hello messages on the specified interval. + setInterval(sendHello, this.options.interval); - self.start(); -}; + // Immediately send the first hello message. + sendHello(); -/** - * Start the democratic process by binding to the UDP port and holding the first election. - * @return {Democracy} - */ -Democracy.prototype.start = function() { - var self = this; - - // Bind to the UDP port and begin listeneing for hello, etc messages. - self.socket.bind(self.options.source[1], self.options.source[0], function() { - // Listen for messages on this port. - self.socket.on('message', function(msg) { - self.processEvent(msg); - }); + return this; + } + + /** + * Send a message to the other peers. + * @param {String} event 'hello', 'vote', etc + * @param {Object} extra Other data to send. + * @return {Democracy} + */ + send(event, extra) { + const data = {event, id: this._id}; + + if (event === 'vote') { + data.candidate = extra.candidate; + } else { + data.weight = this._weight; + data.state = this._state; - // Start sending 'hello' messages to the other nodes. - self.hello(); - }); - - // Run an election after two intervals if we still don't have a leader. - setTimeout(function() { - // Check if we have a leader. - var haveLeader = false; - for (var id in self._nodes) { - if (self._nodes[id].state === 'leader') { - haveLeader = true; - break; + // Handle custom messaging between nodes. + if (extra) { + data.extra = extra; } } - if (!haveLeader && self._state !== 'leader') { - self.holdElections(); - } - }, self.options.interval * 2); + data.source = `${this.options.source[0]}:${this.options.source[1]}`; - return self; -}; + // Data must be sent as a Buffer over the UDP socket. + const msg = Buffer.from(JSON.stringify(data)); -/** - * Run the `hello` interval to send out the heartbeats. - * @return {Democracy} - */ -Democracy.prototype.hello = function() { - var self = this; + // Loop through each connect node and send the packet over. + for (let i = 0; i < this.options.peers.length; i += 1) { + this.socket.send(msg, 0, msg.length, this.options.peers[i][1], this.options.peers[i][0]); + } - // Send a hello message and then check the other nodes. - var sendHello = function() { - self.send('hello'); - self.check(); - }; + return this; + } - // Schedule hello messages on the specified interval. - setInterval(sendHello, self.options.interval); + /** + * After sending a `hello`, check if any of the other nodes are down. + * @return {Democracy} + */ + check() { + Object.keys(this._nodes).forEach((id) => { + if (this._nodes[id] && this._nodes[id].last + this.options.timeout < Date.now()) { + // Increment the vote count. + if (this._nodes[id].voters.indexOf(this._id) < 0) { + this._nodes[id].voters.push(this._id); + + // Send the vote to the other peers that this one is down. + this.send('vote', {candidate: id}); + this.checkBallots(id); + } + } + }); - // Immediately send the first hello message. - sendHello(); + return this; + } - return self; -}; + /** + * Process events that are received over the network. + * @param {Object} msg Data received. + * @return {Democracy} + */ + processEvent(msg) { + const data = this.decodeMsg(msg); -/** - * Send a message to the other peers. - * @param {String} event 'hello', 'vote', etc - * @param {Object} extra Other data to send. - * @return {Democracy} - */ -Democracy.prototype.send = function(event, extra) { - var self = this; - var data = {event: event, id: self._id}; - - if (event === 'vote') { - data.candidate = extra.candidate; - } else { - data.weight = self._weight; - data.state = self._state; - - // Handle custom messaging between nodes. - if (extra) { - data.extra = extra; + if (!data || data.id === this._id) { + return this; } - } - - data.source = self.options.source[0] + ':' + self.options.source[1]; - - // Data must be sent as a Buffer over the UDP socket. - var msg = new Buffer(JSON.stringify(data)); - // Loop through each connect node and send the packet over. - for (var i=0; i= numVoters) { + this.emit('removed', this._nodes[candidate]); + this._nodes[candidate] = null; } - } else if (data.event === 'vote') { - if (self._nodes[data.candidate] && self._nodes[data.candidate].voters.indexOf(data.id) < 0) { - // Tally this vote. - self._nodes[data.candidate].voters.push(data.id); - // Process the ballots to see if this node should be removed and a new leader selected. - self.checkBallots(data.candidate); - } - } else if (data.event === 'leader') { - if (!self._nodes[data.id]) { - self._nodes[data.id] = { - id: data.id, - weight: data.weight, - state: data.state, - last: Date.now(), - voters: [] - }; - - self.emit('added', self._nodes[data.id]); - } else { - self._nodes[data.id].state = 'leader'; + if (state === 'leader') { + this.holdElections(); } - self.emit('leader', self._nodes[data.id]); - } else { - // Handle custom messaging between nodes. - self.emit(data.event, data); + return this; } - return self; -}; + /** + * Hold an election for a new leader. + * @return {Democracy} + */ + holdElections() { + const nodes = this.nodes(); + let highestWeight = 0; + let newLeader; + + // Elect a new leader based on highest weight. + // Each server should always elect the same leader. + Object.keys(nodes).forEach((id) => { + if (nodes[id] && nodes[id].weight > highestWeight) { + highestWeight = nodes[id].weight; + newLeader = id; + } + }); -/** - * Check if a unanimous decision has been reached by the active nodes. - * @param {String} candidate ID of the candidate to be removed. - * @return {Democracy} - */ -Democracy.prototype.checkBallots = function(candidate) { - var self = this; - var node = self._nodes[candidate]; - var state = node.state; - var numVoters = 0; - - // Count the number of voters that haven't been marked for election. - for (var i=0; i= numVoters) { - self.emit('removed', self._nodes[candidate]); - self._nodes[candidate] = null; - } + // Elect our new benevolent dictator for life...of process. + if (newLeader === this._id || !newLeader) { + this._state = 'leader'; + nodes[newLeader].state = 'leader'; + this.emit('elected', nodes[newLeader]); + this.send('leader'); + } else { + this._nodes[newLeader].state = 'leader'; + } - if (state === 'leader') { - self.holdElections(); - } + this._hadElection = true; - return self; -}; + return this; + } -/** - * Hold an election for a new leader. - * @return {Democracy} - */ -Democracy.prototype.holdElections = function() { - var self = this; - var highestWeight = 0; - var nodes = self.nodes(); - var newLeader; - - // Elect a new leader based on highest weight. - // Each server should always elect the same leader. - for (var id in nodes) { - if (nodes[id] && nodes[id].weight > highestWeight) { - highestWeight = nodes[id].weight; - newLeader = id; + /** + * Resign as leader and fly into the sunset disgraced. + * Calling this directly on the current leader will prompt a new election, + * which could result in this same node becoming leader again (as is the way of the world). + * @return {Democracy} + */ + resign() { + const nodes = this.nodes(); + + if (this._state === 'leader') { + this._state = 'citizen'; + this.emit('resigned', nodes[this._id]); + this.send('hello'); } - } - // If we are currently the leader, but not the "new leader", we lose the runoff and resign. - if (self._state === 'leader' && newLeader && newLeader !== self._id) { - self.resign(); + return this; } - // Elect our new benevolent dictator for life...of process. - if (newLeader === self._id || !newLeader) { - self._state = 'leader'; - nodes[newLeader].state = 'leader'; - self.emit('elected', nodes[newLeader]); - self.send('leader'); - } else { - self._nodes[newLeader].state = 'leader'; + /** + * Get the list of current nodes, including this one. + * @return {Object} All nodes. + */ + nodes() { + // Add this server into the nodes list. + const nodes = JSON.parse(JSON.stringify(this._nodes)); + nodes[this._id] = { + id: this._id, + weight: this._weight, + state: this._state, + }; + + return nodes; } - self._hadElection = true; - - return self; -}; + /** + * Find our current fearless leader. + * @return {Object} Current leader. + */ + leader() { + const nodes = this.nodes(); + let leader = null; + + Object.keys(nodes).forEach((id) => { + if (nodes[id] && nodes[id].state === 'leader') { + leader = nodes[id]; + } + }); -/** - * Resign as leader and fly into the sunset disgraced. - * Calling this directly on the current leader will prompt a new election, - * which could result in this same node becoming leader again (as is the way of the world). - * @return {Democracy} - */ -Democracy.prototype.resign = function(noElection) { - var self = this; - var nodes = self.nodes(); - - if (self._state === 'leader') { - self._state = 'citizen'; - self.emit('resigned', nodes[self._id]); - self.send('hello'); + return leader; } - return self; -}, - -/** - * Get the list of current nodes, including this one. - * @return {Object} All nodes. - */ -Democracy.prototype.nodes = function() { - var self = this; - - // Add this server into the nodes list. - var nodes = JSON.parse(JSON.stringify(self._nodes)); - nodes[self._id] = { - id: self._id, - weight: self._weight, - state: self._state - }; - - return nodes; -}; + /** + * Check if the current server is the leader or not. + * @return {Boolean} True if this is the leader. + */ + isLeader() { + const leader = this.leader(); -/** - * Find our current fearless leader. - * @return {Object} Current leader. - */ -Democracy.prototype.leader = function() { - var self = this; - var nodes = self.nodes(); - var leader = null; - - for (var id in nodes) { - if (nodes[id] && nodes[id].state === 'leader') { - leader = nodes[id]; - break; - } + return leader ? this._id === leader.id : false; } - return leader; -}, - -/** - * Check if the current server is the leader or not. - * @return {Boolean} True if this is the leader. - */ -Democracy.prototype.isLeader = function() { - var leader = this.leader(); - - return leader ? this._id === leader.id : false; -}; - -/** - * Safely decode a Buffer message received over UDP. - * @param {Buffer} msg Received data. - * @return {Object} Parsed data. - */ -Democracy.prototype.decodeMsg = function(msg) { - try { - msg = JSON.parse(decoder.write(msg)); - } catch (e) { - msg = null; + /** + * Safely decode a Buffer message received over UDP. + * @param {Buffer} msg Received data. + * @return {Object} Parsed data. + */ + decodeMsg(msg) { + try { + return JSON.parse(decoder.write(msg)); + } catch (e) { + return null; + } } - - return msg; -}; +} module.exports = Democracy; diff --git a/package.json b/package.json index 6d56fa8..f9ccf63 100644 --- a/package.json +++ b/package.json @@ -27,6 +27,6 @@ "uuid": "3.0.*" }, "engines": [ - "node >= 0.12.0" + "node >= 6.4.0" ] } From 84684e701e9eb3faaf77fd5a7d60719c9ae9bd24 Mon Sep 17 00:00:00 2001 From: James Simpson Date: Wed, 14 Feb 2018 09:05:38 -0600 Subject: [PATCH 2/6] Setup ESLint --- .eslintrc.json | 11 + package-lock.json | 1497 +++++++++++++++++++++++++++++++++++++++++++++ package.json | 5 + 3 files changed, 1513 insertions(+) create mode 100644 .eslintrc.json create mode 100644 package-lock.json diff --git a/.eslintrc.json b/.eslintrc.json new file mode 100644 index 0000000..40264d9 --- /dev/null +++ b/.eslintrc.json @@ -0,0 +1,11 @@ +{ + "env": { + "es6": true, + "node": true + }, + "extends": "airbnb-base", + "rules": { + "object-curly-spacing": ["warn", "never"], + "no-underscore-dangle": 0 + } +} diff --git a/package-lock.json b/package-lock.json new file mode 100644 index 0000000..d0d88ec --- /dev/null +++ b/package-lock.json @@ -0,0 +1,1497 @@ +{ + "name": "democracy", + "version": "1.3.0", + "lockfileVersion": 1, + "requires": true, + "dependencies": { + "acorn": { + "version": "5.4.1", + "resolved": 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a/package.json b/package.json index f9ccf63..57d76be 100644 --- a/package.json +++ b/package.json @@ -26,6 +26,11 @@ "dependencies": { "uuid": "3.0.*" }, + "devDependencies": { + "eslint": "4.17.0", + "eslint-config-airbnb-base": "12.1.0", + "eslint-plugin-import": "2.8.0" + }, "engines": [ "node >= 6.4.0" ] From ce501a452b8ba6f6ddb4b72ec84689112d364e1f Mon Sep 17 00:00:00 2001 From: James Simpson Date: Wed, 14 Feb 2018 10:03:05 -0600 Subject: [PATCH 3/6] Setup a basic pub/sub feature --- lib/democracy.js | 92 +++++++++++++++++++++++++++++++++++++----------- 1 file changed, 71 insertions(+), 21 deletions(-) diff --git a/lib/democracy.js b/lib/democracy.js index 0a02b21..20a9736 100644 --- a/lib/democracy.js +++ b/lib/democracy.js @@ -33,6 +33,7 @@ class Democracy extends EventEmitter { peers: options.peers || [], weight: options.weight || Math.random() * Date.now(), id: options.id || uuid.v4(), + channels: options.channels || [], }; // Remove the source from the peers. @@ -114,11 +115,11 @@ class Democracy extends EventEmitter { /** * Send a message to the other peers. - * @param {String} event 'hello', 'vote', etc + * @param {String} event 'hello', 'vote', etc. * @param {Object} extra Other data to send. * @return {Democracy} */ - send(event, extra) { + send(event, extra, id) { const data = {event, id: this._id}; if (event === 'vote') { @@ -126,6 +127,7 @@ class Democracy extends EventEmitter { } else { data.weight = this._weight; data.state = this._state; + data.channels = this.options.channels; // Handle custom messaging between nodes. if (extra) { @@ -140,7 +142,9 @@ class Democracy extends EventEmitter { // Loop through each connect node and send the packet over. for (let i = 0; i < this.options.peers.length; i += 1) { - this.socket.send(msg, 0, msg.length, this.options.peers[i][1], this.options.peers[i][0]); + if (!id || this._nodes[id].source === `${this.options.peers[i][0]}:${this.options.peers[i][1]}`) { + this.socket.send(msg, 0, msg.length, this.options.peers[i][1], this.options.peers[i][0]); + } } return this; @@ -167,6 +171,61 @@ class Democracy extends EventEmitter { return this; } + /** + * Subscribe to a channel to listen for events from other nodes. + * @param {String} channel Channel name (can't be 'hello', 'vote', 'leader', or 'subscribe'). + * @return {Democracy} + */ + subscribe(channel) { + // Add the channel to this node. + this.options.channels.push(channel); + + // Broadcast to the other nodes that this one has subscribed. + this.send('subscribe', {channel}); + + return this; + } + + /** + * Publish a message to any nodes that are subscribed to the passed channel. + * @param {String} channel Channel to publish to. + * @param {Mixed} msg Data to send. + * @return {Democracy} + */ + publish(channel, msg) { + // Loop through all nodes and send the message to ones that are subscribed. + Object.keys(this._nodes).forEach((id) => { + if (this._nodes[id] && this._nodes[id].channels.includes(channel)) { + this.send(channel, msg, id); + } + }); + + return this; + } + + /** + * Add a new node's data to the list (internal method). + * @param {data} data Node data to setup. + * @return {Democracy} + */ + addNodeToList(data) { + // Add the node to the list. + this._nodes[data.id] = { + id: data.id, + source: data.source, + weight: data.weight, + state: data.state, + last: Date.now(), + voters: [], + channels: data.channels || [], + }; + + // Emit that this node has been added. + this.emit('added', this._nodes[data.id]); + + return this; + } + /** * Process events that are received over the network. * @param {Object} msg Data received. @@ -183,15 +242,7 @@ class Democracy extends EventEmitter { if (data.event === 'hello') { // Create a new node if we don't already know about this one. if (!this._nodes[data.id]) { - this._nodes[data.id] = { - id: data.id, - weight: data.weight, - state: data.state, - last: Date.now(), - voters: [], - }; - - this.emit('added', this._nodes[data.id]); + this.addNodeToList(data); } else { this._nodes[data.id].last = Date.now(); this._nodes[data.id].state = data.state; @@ -225,20 +276,18 @@ class Democracy extends EventEmitter { } } else if (data.event === 'leader') { if (!this._nodes[data.id]) { - this._nodes[data.id] = { - id: data.id, - weight: data.weight, - state: data.state, - last: Date.now(), - voters: [], - }; - - this.emit('added', this._nodes[data.id]); + this.addNodeToList(data); } else { this._nodes[data.id].state = 'leader'; } this.emit('leader', this._nodes[data.id]); + } else if (data.event === 'subscribe') { + if (!this._nodes[data.id]) { + this.addNodeToList(data); + } else { + this._nodes[data.id].channels.push(data.channel); + } } else { // Handle custom messaging between nodes. this.emit(data.event, data); @@ -344,6 +393,7 @@ class Democracy extends EventEmitter { id: this._id, weight: this._weight, state: this._state, + channels: this.options.channels, }; return nodes; From d602073804ada12ac3009a7c9bf124772031d78e Mon Sep 17 00:00:00 2001 From: James Simpson Date: Wed, 14 Feb 2018 10:12:03 -0600 Subject: [PATCH 4/6] Custom events emit only extra data --- lib/democracy.js | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/lib/democracy.js b/lib/democracy.js index 20a9736..c09581a 100644 --- a/lib/democracy.js +++ b/lib/democracy.js @@ -290,7 +290,7 @@ class Democracy extends EventEmitter { } } else { // Handle custom messaging between nodes. - this.emit(data.event, data); + this.emit(data.event, data.extra); } return this; From e53a3312d7d38585f5b3d220f24b899642299cf0 Mon Sep 17 00:00:00 2001 From: James Simpson Date: Wed, 14 Feb 2018 10:35:14 -0600 Subject: [PATCH 5/6] Update the README --- README.md | 35 +++++++++++++++++++++++++---------- 1 file changed, 25 insertions(+), 10 deletions(-) diff --git a/README.md b/README.md index 31f741d..13ead6b 100644 --- a/README.md +++ b/README.md @@ -12,29 +12,39 @@ The below example is easy to run on your local machine (also found in the exampl ```javascript var Democracy = require('democracy'); +// Basic usage of democracy to manager leader and citizen nodes. var dem = new Democracy({ source: '0.0.0.0:12345', - peers: ['0.0.0.0:12345', '0.0.0.0:12346', '0.0.0.0:12347'] + peers: ['0.0.0.0:12345', '0.0.0.0:12346', '0.0.0.0:12347'], }); -dem.on('added', function(data) { +dem.on('added', (data) => { console.log('Added: ', data); }); -dem.on('removed', function(data) { +dem.on('removed', (data) => { console.log('Removed: ', data); }); -dem.on('elected', function(data) { +dem.on('elected', (data) => { console.log('You have been elected leader!'); }); -dem.on('ciao', function(data) { - console.log('ciao from %s', data.id, data.extra); +// Support for custom events. +dem.on('ciao', (data) => { + console.log(data.hello); // Logs 'world' }); dem.send('ciao', {hello: 'world'}); +// Support for basic pub/sub. +dem.on('my-channel', (data) => { + console.log(data.hello); // Logs 'world' +}); + +dem.subscribe('my-channel'); +dem.publish('my-channel', {hello: 'world'}); + ``` ## API @@ -45,8 +55,9 @@ new Democracy({ timeout: 3000, // How long a peer must go without sending a `hello` to be considered down. source: '0.0.0.0:12345', // The IP and port to listen to (usually the local IP). peers: [], // The other servers/ports you want to communicate with (can be on the same or different server). - weight: Math.random() * Date.now() // The highest weight is used to determine the new leader. Must be unique for each node. - id: 'uuid' // (optional) This is generated automatically with uuid, but can optionally be set. Must be unique for each node. + weight: Math.random() * Date.now(), // The highest weight is used to determine the new leader. Must be unique for each node. + id: 'uuid', // (optional) This is generated automatically with uuid, but can optionally be set. Must be unique for each node. + channels: [], // (optional) Array of channels for this node to listen to (for pub/sub). }); ``` @@ -59,8 +70,12 @@ Returns the current leader node from the cluster. Returns whether or not the current server is the leader. #### resign() If called on the current leader node, will force it to resign as the leader. A new election will be held, which means the same node could be re-elected. -#### send(customEvent, extraData) +#### send(customEvent, data) Sends a custom event to all other nodes. +#### subscribe(channel) +Subscribe to a channel for use with pub/sub. +#### publish(channel, data) +Publish to a channel and send specific data with pub/sub. ### Events All events return the data/configuration of the affected node as their first parameter. @@ -79,6 +94,6 @@ Fired on the server that has resigned as the leader. Fired on all the server except the one that "sent" the event. ## License -Copyright (c) 2016 James Simpson and GoldFire Studios, Inc. +Copyright (c) 2016 - 2018 James Simpson and GoldFire Studios, Inc. Released under the MIT License. From e1f5877918cdd07599c23ece931b7386889baaf7 Mon Sep 17 00:00:00 2001 From: James Simpson Date: Wed, 14 Feb 2018 10:43:35 -0600 Subject: [PATCH 6/6] More package and readme updates --- README.md | 5 ++--- package-lock.json | 8 ++++---- package.json | 15 ++++++++------- 3 files changed, 14 insertions(+), 14 deletions(-) diff --git a/README.md b/README.md index 13ead6b..59cd767 100644 --- a/README.md +++ b/README.md @@ -2,9 +2,8 @@ In-process monitoring of distributed Node.js instances over UDP unicast. Simply require democracy in each instance and provide the IP/port for other peers and the rest is taken care of automatically. democracy.js will get the configuration from the other nodes, elect a leader and keep them all in sync. If the active leader becomes unresponsive, the other instances will elect a new leader. ## Installation -``` -npm install democracy -``` +* Install with [npm](https://www.npmjs.com/package/democracy): `npm install democracy` +* Install with [Yarn](https://yarnpkg.com/en/package/democracy): `yarn add democracy` ## Examples The below example is easy to run on your local machine (also found in the examples directory). The IP's can just as easily be swapped out for IP's of other servers/instances. diff --git a/package-lock.json b/package-lock.json index d0d88ec..78d3ef7 100644 --- a/package-lock.json +++ b/package-lock.json @@ -1,6 +1,6 @@ { "name": "democracy", - "version": "1.3.0", + "version": "2.0.0", "lockfileVersion": 1, "requires": true, "dependencies": { @@ -1443,9 +1443,9 @@ "dev": true }, "uuid": { - "version": "3.0.1", - "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.0.1.tgz", - "integrity": "sha1-ZUS7ot/ajBzxfmKaOjBeK7H+5sE=" + "version": "3.2.1", + "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.2.1.tgz", + "integrity": "sha512-jZnMwlb9Iku/O3smGWvZhauCf6cvvpKi4BKRiliS3cxnI+Gz9j5MEpTz2UFuXiKPJocb7gnsLHwiS05ige5BEA==" }, "validate-npm-package-license": { "version": "3.0.1", diff --git a/package.json b/package.json index 57d76be..86c314f 100644 --- a/package.json +++ b/package.json @@ -1,5 +1,6 @@ { "name": "democracy", + "version": "1.3.0", "description": "Node.js unicast discovery and master-slave elections.", "homepage": "https://github.com/goldfire/democracy.js", "keywords": [ @@ -10,21 +11,21 @@ "leader", "unicast", "udp", - "discovery" + "discovery", + "pubsub" ], "author": "James Simpson (http://goldfirestudios.com)", "repository": { "type": "git", "url": "git://github.com/goldfire/democracy.js.git" }, - "main": "index.js", - "version": "1.3.0", - "license": { - "type": "MIT", - "url": "https://raw.githubusercontent.com/goldfire/democracy.js/master/LICENSE.md" + "scripts": { + "release": "VERSION=`printf 'v' && node -e 'console.log(require(\"./package.json\").version)'` && git tag $VERSION && git push && git push origin $VERSION && npm publish" }, + "main": "index.js", + "license": "MIT", "dependencies": { - "uuid": "3.0.*" + "uuid": "3.2.*" }, "devDependencies": { "eslint": "4.17.0",