From 301bcae923d0a0259f7371f02708ff9f0e364296 Mon Sep 17 00:00:00 2001 From: Andrea Date: Sun, 28 Oct 2018 11:27:46 +0000 Subject: [PATCH] emit 'removed' callback after removing node --- .eslintrc.json | 22 +- LICENSE.md | 38 +- README.md | 196 +-- examples/test.js | 68 +- index.js | 2 +- lib/democracy.js | 918 +++++++------- package-lock.json | 3048 ++++++++++++++++++++++----------------------- package.json | 76 +- 8 files changed, 2184 insertions(+), 2184 deletions(-) diff --git a/.eslintrc.json b/.eslintrc.json index 40264d9..53db1dc 100644 --- a/.eslintrc.json +++ b/.eslintrc.json @@ -1,11 +1,11 @@ -{ - "env": { - "es6": true, - "node": true - }, - "extends": "airbnb-base", - "rules": { - "object-curly-spacing": ["warn", "never"], - "no-underscore-dangle": 0 - } -} +{ + "env": { + "es6": true, + "node": true + }, + "extends": "airbnb-base", + "rules": { + "object-curly-spacing": ["warn", "never"], + "no-underscore-dangle": 0 + } +} diff --git a/LICENSE.md b/LICENSE.md index 792e333..f3d1d62 100644 --- a/LICENSE.md +++ b/LICENSE.md @@ -1,20 +1,20 @@ -Copyright (c) 2016 James Simpson and GoldFire Studios, Inc. - -Permission is hereby granted, free of charge, to any person obtaining -a copy of this software and associated documentation files (the -"Software"), to deal in the Software without restriction, including -without limitation the rights to use, copy, modify, merge, publish, -distribute, sublicense, and/or sell copies of the Software, and to -permit persons to whom the Software is furnished to do so, subject to -the following conditions: - -The above copyright notice and this permission notice shall be -included in all copies or substantial portions of the Software. - -THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, -EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF -MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND -NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE -LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION -OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION +Copyright (c) 2016 James Simpson and GoldFire Studios, Inc. + +Permission is hereby granted, free of charge, to any person obtaining +a copy of this software and associated documentation files (the +"Software"), to deal in the Software without restriction, including +without limitation the rights to use, copy, modify, merge, publish, +distribute, sublicense, and/or sell copies of the Software, and to +permit persons to whom the Software is furnished to do so, subject to +the following conditions: + +The above copyright notice and this permission notice shall be +included in all copies or substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, +EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF +MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND +NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE +LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION +OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. \ No newline at end of file diff --git a/README.md b/README.md index 59cd767..86dc41d 100644 --- a/README.md +++ b/README.md @@ -1,98 +1,98 @@ -## Description -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 -* 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. - -```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'], -}); - -dem.on('added', (data) => { - console.log('Added: ', data); -}); - -dem.on('removed', (data) => { - console.log('Removed: ', data); -}); - -dem.on('elected', (data) => { - console.log('You have been elected leader!'); -}); - -// 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 -### Constructor -```javascript -new Democracy({ - interval: 1000, // The interval (ms) at which `hello` heartbeats are sent to the other peers. - 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. - channels: [], // (optional) Array of channels for this node to listen to (for pub/sub). -}); -``` - -### Methods -#### nodes() -Returns the object containing all active nodes and their properties (including the one the method is called from). -#### leader() -Returns the current leader node from the cluster. -#### isLeader() -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, 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. - -#### added -Fired when a new peer has been found. -#### removed -Fired when a peer has gone down and subsequently been removed from the list. -#### leader -Fired when a new leader is selected. -#### elected -Fired on the server that has become the new leader. -#### resigned -Fired on the server that has resigned as the leader. -#### custom/all other events -Fired on all the server except the one that "sent" the event. - -## License -Copyright (c) 2016 - 2018 James Simpson and GoldFire Studios, Inc. - -Released under the MIT License. +## Description +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 +* 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. + +```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'], +}); + +dem.on('added', (data) => { + console.log('Added: ', data); +}); + +dem.on('removed', (data) => { + console.log('Removed: ', data); +}); + +dem.on('elected', (data) => { + console.log('You have been elected leader!'); +}); + +// 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 +### Constructor +```javascript +new Democracy({ + interval: 1000, // The interval (ms) at which `hello` heartbeats are sent to the other peers. + 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. + channels: [], // (optional) Array of channels for this node to listen to (for pub/sub). +}); +``` + +### Methods +#### nodes() +Returns the object containing all active nodes and their properties (including the one the method is called from). +#### leader() +Returns the current leader node from the cluster. +#### isLeader() +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, 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. + +#### added +Fired when a new peer has been found. +#### removed +Fired when a peer has gone down and subsequently been removed from the list. +#### leader +Fired when a new leader is selected. +#### elected +Fired on the server that has become the new leader. +#### resigned +Fired on the server that has resigned as the leader. +#### custom/all other events +Fired on all the server except the one that "sent" the event. + +## License +Copyright (c) 2016 - 2018 James Simpson and GoldFire Studios, Inc. + +Released under the MIT License. diff --git a/examples/test.js b/examples/test.js index aa575ee..b9afec3 100644 --- a/examples/test.js +++ b/examples/test.js @@ -1,34 +1,34 @@ -/** - * Basic example usage of democracy.js - * - * Test on your local machine by running three instances of this test script, - * with the parameter being the port. You can then test it by killing the leader - * process to see the re-election happen between the remaining two. - * - * node test.js 12345 - * node test.js 12346 - * node test.js 12347 - */ - -var Democracy = require('democracy'); - -var dem = new Democracy({ - source: '0.0.0.0:' + process.argv[2], - peers: ['0.0.0.0:12345', '0.0.0.0:12346', '0.0.0.0:12347'] -}); - -dem.on('added', function(data) { - console.log('Added: ', data); -}); - -dem.on('removed', function(data) { - console.log('Removed: ', data); -}); - -dem.on('elected', function(data) { - console.log('You are elected leader!'); -}); - -dem.on('leader', function(data) { - console.log('New Leader: ', data); -}); +/** + * Basic example usage of democracy.js + * + * Test on your local machine by running three instances of this test script, + * with the parameter being the port. You can then test it by killing the leader + * process to see the re-election happen between the remaining two. + * + * node test.js 12345 + * node test.js 12346 + * node test.js 12347 + */ + +var Democracy = require('democracy'); + +var dem = new Democracy({ + source: '0.0.0.0:' + process.argv[2], + peers: ['0.0.0.0:12345', '0.0.0.0:12346', '0.0.0.0:12347'] +}); + +dem.on('added', function(data) { + console.log('Added: ', data); +}); + +dem.on('removed', function(data) { + console.log('Removed: ', data); +}); + +dem.on('elected', function(data) { + console.log('You are elected leader!'); +}); + +dem.on('leader', function(data) { + console.log('New Leader: ', data); +}); diff --git a/index.js b/index.js index 1fed089..780f6fb 100644 --- a/index.js +++ b/index.js @@ -1 +1 @@ -module.exports = require('./lib/democracy.js'); +module.exports = require('./lib/democracy.js'); diff --git a/lib/democracy.js b/lib/democracy.js index 302adfa..59580d9 100644 --- a/lib/democracy.js +++ b/lib/democracy.js @@ -1,459 +1,459 @@ -/** - * democracy.js - * Copyright (c) 2016 - 2018, GoldFire Studios, Inc. - * http://goldfirestudios.com - */ - -const uuid = require('uuid'); -const dgram = require('dgram'); -const {EventEmitter} = require('events'); -const {StringDecoder} = require('string_decoder'); - -// Create the string decoder. -const decoder = new StringDecoder('utf8'); - -/** - * Setup the base Democracy class that handles all of the methods. - */ -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(), - channels: options.channels || [], - }; - - // Remove the source from the peers. - const sourceIndex = this.options.peers.indexOf(this.options.source); - if (sourceIndex >= 0) { - this.options.peers.splice(sourceIndex, 1); - } - - // 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(':'); - } - - // 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(); - } - - /** - * Start the democratic process by binding to the UDP port and holding the first election. - * @return {Democracy} - */ - start() { - // Bind to the UDP port and begin listeneing for hello, etc messages. - this.socket.bind(this.options.source[1], this.options.source[0], () => { - // 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; - } - - /** - * 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(); - }; - - // Schedule hello messages on the specified interval. - setInterval(sendHello, this.options.interval); - - // Immediately send the first hello message. - sendHello(); - - 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, id) { - const data = {event, id: this._id}; - - if (event === 'vote') { - data.candidate = extra.candidate; - } else { - data.weight = this._weight; - data.state = this._state; - data.channels = this.options.channels; - - // Handle custom messaging between nodes. - if (extra) { - data.extra = extra; - } - } - - data.source = `${this.options.source[0]}:${this.options.source[1]}`; - - // Data must be sent as a Buffer over the UDP socket. - const msg = Buffer.from(JSON.stringify(data)); - - // Loop through each connect node and send the packet over. - for (let i = 0; i < this.options.peers.length; i += 1) { - 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; - } - - /** - * 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); - } - } - }); - - 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. - const ids = Object.keys(this._nodes); - for (let i = 0; i < ids.length; i += 1) { - const id = ids[i]; - 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 || [], - }; - - // Add this to the peers list. - const source = data.source.split(':'); - const index = this.options.peers.findIndex(p => p[0] === source[0] && p[1] === source[1]); - if (index < 0) { - this.options.peers.push(data.source.split(':')); - } - - // 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. - * @return {Democracy} - */ - processEvent(msg) { - const data = this.decodeMsg(msg); - - if (!data || data.id === this._id) { - return this; - } - - // Process the different available events. - if (data.event === 'hello') { - // Create a new node if we don't already know about this one. - if (!this._nodes[data.id]) { - this.addNodeToList(data); - } else { - this._nodes[data.id].last = Date.now(); - this._nodes[data.id].state = data.state; - this._nodes[data.id].weight = data.weight; - } - - // Reset the voters since we've now seen this node again. - this._nodes[data.id].voters = []; - - // If we are both leaders, hold a runoff to determine the winner...hanging chads and all. - if (this._state === 'leader' && data.state === 'leader') { - this.holdElections(); - } - - // If we now have no leader, hold a new election. - if (this._hadElection && !this.leader()) { - this.holdElections(); - } - - // We have had an election somewhere if we have a leader. - if (this.leader()) { - this._hadElection = true; - } - } else if (data.event === 'vote') { - if (this._nodes[data.candidate] && this._nodes[data.candidate].voters.indexOf(data.id) < 0) { - // Tally this vote. - this._nodes[data.candidate].voters.push(data.id); - - // Process the ballots to see if this node should be removed and a new leader selected. - this.checkBallots(data.candidate); - } - } else if (data.event === 'leader') { - if (!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.extra.channel); - } - } else { - // Handle custom messaging between nodes. - this.emit(data.event, data.extra); - } - - return this; - } - - /** - * Check if a unanimous decision has been reached by the active nodes. - * @param {String} candidate ID of the candidate to be removed. - * @return {Democracy} - */ - checkBallots(candidate) { - const node = this._nodes[candidate]; - const {state} = node; - let numVoters = 0; - - // Count the number of voters that haven't been marked for election. - for (let i = 0; i < this._nodes.length; i += 1) { - if (this._nodes[i] && !this._nodes[i].voters.length) { - numVoters += 1; - } - } - - // If we have concensus, remove this node from the list. - if (node.voters.length >= numVoters) { - this.emit('removed', node); - - // Remove from the nodes/peers. - const source = node.source.split(':'); - const index = this.options.peers.findIndex(p => p[0] === source[0] && p[1] === source[1]); - if (index >= 0) { - this.options.peers.splice(index, 1); - } - this._nodes[candidate] = null; - } - - if (state === 'leader') { - this.holdElections(); - } - - return this; - } - - /** - * 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; - } - }); - - // If we are currently the leader, but not the "new leader", we lose the runoff and resign. - if (this._state === 'leader' && newLeader && newLeader !== this._id) { - this.resign(); - } - - // 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'; - } - - this._hadElection = true; - - return this; - } - - /** - * 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'); - } - - return this; - } - - /** - * 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, - channels: this.options.channels, - }; - - return nodes; - } - - /** - * 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]; - } - }); - - return leader; - } - - /** - * Check if the current server is the leader or not. - * @return {Boolean} True if this is the leader. - */ - isLeader() { - const 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. - */ - decodeMsg(msg) { - try { - return JSON.parse(decoder.write(msg)); - } catch (e) { - return null; - } - } -} - -module.exports = Democracy; +/** + * democracy.js + * Copyright (c) 2016 - 2018, GoldFire Studios, Inc. + * http://goldfirestudios.com + */ + +const uuid = require('uuid'); +const dgram = require('dgram'); +const {EventEmitter} = require('events'); +const {StringDecoder} = require('string_decoder'); + +// Create the string decoder. +const decoder = new StringDecoder('utf8'); + +/** + * Setup the base Democracy class that handles all of the methods. + */ +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(), + channels: options.channels || [], + }; + + // Remove the source from the peers. + const sourceIndex = this.options.peers.indexOf(this.options.source); + if (sourceIndex >= 0) { + this.options.peers.splice(sourceIndex, 1); + } + + // 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(':'); + } + + // 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(); + } + + /** + * Start the democratic process by binding to the UDP port and holding the first election. + * @return {Democracy} + */ + start() { + // Bind to the UDP port and begin listeneing for hello, etc messages. + this.socket.bind(this.options.source[1], this.options.source[0], () => { + // 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; + } + + /** + * 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(); + }; + + // Schedule hello messages on the specified interval. + setInterval(sendHello, this.options.interval); + + // Immediately send the first hello message. + sendHello(); + + 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, id) { + const data = {event, id: this._id}; + + if (event === 'vote') { + data.candidate = extra.candidate; + } else { + data.weight = this._weight; + data.state = this._state; + data.channels = this.options.channels; + + // Handle custom messaging between nodes. + if (extra) { + data.extra = extra; + } + } + + data.source = `${this.options.source[0]}:${this.options.source[1]}`; + + // Data must be sent as a Buffer over the UDP socket. + const msg = Buffer.from(JSON.stringify(data)); + + // Loop through each connect node and send the packet over. + for (let i = 0; i < this.options.peers.length; i += 1) { + 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; + } + + /** + * 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); + } + } + }); + + 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. + const ids = Object.keys(this._nodes); + for (let i = 0; i < ids.length; i += 1) { + const id = ids[i]; + 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 || [], + }; + + // Add this to the peers list. + const source = data.source.split(':'); + const index = this.options.peers.findIndex(p => p[0] === source[0] && p[1] === source[1]); + if (index < 0) { + this.options.peers.push(data.source.split(':')); + } + + // 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. + * @return {Democracy} + */ + processEvent(msg) { + const data = this.decodeMsg(msg); + + if (!data || data.id === this._id) { + return this; + } + + // Process the different available events. + if (data.event === 'hello') { + // Create a new node if we don't already know about this one. + if (!this._nodes[data.id]) { + this.addNodeToList(data); + } else { + this._nodes[data.id].last = Date.now(); + this._nodes[data.id].state = data.state; + this._nodes[data.id].weight = data.weight; + } + + // Reset the voters since we've now seen this node again. + this._nodes[data.id].voters = []; + + // If we are both leaders, hold a runoff to determine the winner...hanging chads and all. + if (this._state === 'leader' && data.state === 'leader') { + this.holdElections(); + } + + // If we now have no leader, hold a new election. + if (this._hadElection && !this.leader()) { + this.holdElections(); + } + + // We have had an election somewhere if we have a leader. + if (this.leader()) { + this._hadElection = true; + } + } else if (data.event === 'vote') { + if (this._nodes[data.candidate] && this._nodes[data.candidate].voters.indexOf(data.id) < 0) { + // Tally this vote. + this._nodes[data.candidate].voters.push(data.id); + + // Process the ballots to see if this node should be removed and a new leader selected. + this.checkBallots(data.candidate); + } + } else if (data.event === 'leader') { + if (!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.extra.channel); + } + } else { + // Handle custom messaging between nodes. + this.emit(data.event, data.extra); + } + + return this; + } + + /** + * Check if a unanimous decision has been reached by the active nodes. + * @param {String} candidate ID of the candidate to be removed. + * @return {Democracy} + */ + checkBallots(candidate) { + const node = this._nodes[candidate]; + const {state} = node; + let numVoters = 0; + + // Count the number of voters that haven't been marked for election. + for (let i = 0; i < this._nodes.length; i += 1) { + if (this._nodes[i] && !this._nodes[i].voters.length) { + numVoters += 1; + } + } + + // If we have concensus, remove this node from the list. + if (node.voters.length >= numVoters) { + // Remove from the nodes/peers. + const source = node.source.split(':'); + const index = this.options.peers.findIndex(p => p[0] === source[0] && p[1] === source[1]); + if (index >= 0) { + this.options.peers.splice(index, 1); + } + this._nodes[candidate] = null; + + this.emit('removed', node); + } + + if (state === 'leader') { + this.holdElections(); + } + + return this; + } + + /** + * 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; + } + }); + + // If we are currently the leader, but not the "new leader", we lose the runoff and resign. + if (this._state === 'leader' && newLeader && newLeader !== this._id) { + this.resign(); + } + + // 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'; + } + + this._hadElection = true; + + return this; + } + + /** + * 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'); + } + + return this; + } + + /** + * 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, + channels: this.options.channels, + }; + + return nodes; + } + + /** + * 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]; + } + }); + + return leader; + } + + /** + * Check if the current server is the leader or not. + * @return {Boolean} True if this is the leader. + */ + isLeader() { + const 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. + */ + decodeMsg(msg) { + try { + return JSON.parse(decoder.write(msg)); + } catch (e) { + return null; + } + } +} + +module.exports = Democracy; diff --git a/package-lock.json b/package-lock.json index 1acc497..1d67fc4 100644 --- a/package-lock.json +++ b/package-lock.json @@ -1,1524 +1,1524 @@ 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push origin $VERSION && npm publish" - }, - "main": "index.js", - "license": "MIT", - "dependencies": { - "uuid": "3.2.*" - }, - "devDependencies": { - "eslint": "4.19.*", - "eslint-config-airbnb-base": "12.1.*", - "eslint-plugin-import": "2.10.*" - }, - "engines": [ - "node >= 6.4.0" - ] -} +{ + "name": "democracy", + "version": "2.1.1", + "description": "Node.js unicast discovery, master-slave elections and pub/sub.", + "homepage": "https://github.com/goldfire/democracy.js", + "keywords": [ + "democracy", + "consensus", + "master", + "master-slave", + "leader", + "unicast", + "udp", + "discovery", + "pubsub" + ], + "author": "James Simpson (http://goldfirestudios.com)", + "repository": { + "type": "git", + "url": "git://github.com/goldfire/democracy.js.git" + }, + "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", + 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