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14
.gitignore vendored
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@ -1,7 +1,6 @@
# Logs
logs
*.log
npm-debug.log*
# Runtime data
pids
@ -14,9 +13,6 @@ lib-cov
# Coverage directory used by tools like istanbul
coverage
# nyc test coverage
.nyc_output
# Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
.grunt
@ -26,12 +22,6 @@ coverage
# Compiled binary addons (http://nodejs.org/api/addons.html)
build/Release
# Dependency directories
# Dependency directory
# https://www.npmjs.org/doc/misc/npm-faq.html#should-i-check-my-node_modules-folder-into-git
node_modules
jspm_packages
# Optional npm cache directory
.npm
# Optional REPL history
.node_repl_history

215
LICENSE
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@ -1,21 +1,202 @@
MIT License
Apache License
Version 2.0, January 2004
http://www.apache.org/licenses/
Copyright (c) 2016 AJ ONeal
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160
README.md
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@ -1,104 +1,74 @@
cluster-store
Cluster Store
=============
Makes any storage strategy similar to `express/session` useful in both `cluster` and non-`cluster` environments
by wrapping it with `cluster-rpc`.
A very simple in-memory object store for use with node cluster
(or even completely and unrelated node processes).
Also works with **level-session-store** (leveldb), **connect-session-knex** (SQLite3), **session-file-store** (fs),
and any other embedded / in-process store.
Node.js runs on a single core, which isn't very effective.
Note: Most people would probably prefer to just use Redis rather than wrap a dumb memstore as a service...
but I am not most people.
You can run multiple Node.js instances to take advantage of multiple cores,
but if you do that, you can't share memory between processes.
Install
=======
This module will either run client-server style in environments that benefit from it
(such as the Raspberry Pi 2 with 4 cores), or in-process for environments that don't
(such as the Raspberry Pi B and B+).
```
npm install --save cluster-store@2.x
```
**Note**: Most people would probably prefer to just use Redis rather than
wrap a dumb memstore as a service... but I am not most people.
v1.x vs v2.x
------------
The [old v1](https://github.com/coolaj86/cluster-store/tree/v1.x)
used `ws` which makes it usable when clustering node processes without using `cluster`.
If you need that functionaliy, use v1 instead of v2.
Also works with **level-session-store** (leveldb), **connect-session-knex** (SQLite3),
**session-file-store** (fs), and any other embedded / in-process store.
Usage
=====
In its simplest form, you use this module nearly exactly the way you would
the any other storage module, with the exception that you must wait for
the inter-process initialization to complete.
The default behavior is to try to connect to a master and, if that fails, to become the master.
When not using any of the options the usage is the same for the master and the worker:
```javascript
require('cluster-store').create().then(function (store) {
// initialization is now complete
store.set('foo', 'bar');
});
```
### standalone (non-cluster)
--------------
There is no disadvantage to using this module standalone.
The additional overhead of inter-process communication is only added when
a worker is added.
As such, the standalone usage is identical to usage in master process, as seen below.
### master
In the **master** process you will create the real store instance.
If you need to manually specify which worker will be enabled for this funcitonality
you must set `addOnFork` to `false` and call `addWorker()` manually.
```javascript
'use strict';
However, if you are in fact using the `cluster` rather than spinning up random instances,
you'll probably prefer to use this pattern:
```js
var cluster = require('cluster');
var cstore = require('cluster-store');
var numCores = require('os').cpus().length;
var cstore = require('cluster-store/master').create({
name: 'foo-store' // necessary when using multiple instances
, store: null // use default in-memory store
, addOnFork: true // default
});
var opts = {
sock: '/tmp/memstore.sock'
// if you addOnFork is set to false you can add specific forks manually
//cstore.addWorker(cluster.fork());
// If left 'null' or 'undefined' this defaults to a similar memstore
// with no special logic for 'cookie' or 'expires'
, store: cluster.isMaster && new require('express-session/session/memory')()
cstore.then(function (store) {
store.set('foo', 'bar');
});
```
// a good default to use for instances where you might want
// to cluster or to run standalone, but with the same API
, serve: cluster.isMaster
, connect: cluster.isWorker
, standalone: (1 === numCores) // overrides serve and connect
};
Note: `store` can be replaced with any `express/session`-compatible store, such as:
cstore.create(opts).then(function (store) {
// same api as new new require('express-session/session/memory')(
* `new require('express-session/session/memory')()`
* `require('level-session-store')(session)`
* and others
### worker
```javascript
'use strict';
// retrieve the instance
var cstore = require('cluster-store/worker').create({
name: 'foo-store'
});
cstore.then(function (store) {
store.get('foo', function (err, result) {
console.log(result);
store.get(id, function (err, data) {
console.log(data);
});
// app.use(expressSession({ secret: 'keyboard cat', store: store }));
});
process.on('unhandledPromiseRejection', function (err) {
console.error('Unhandled Promise Rejection');
console.error(err);
console.error(err.stack);
throw err;
});
```
If you wish to always use clustering, even on a single core system, see `test-cluster.js`.
Likewise, if you wish to use standalone mode in a particular worker process see `test-standalone.js`.
API
===
@ -124,28 +94,22 @@ Helpers
See <https://github.com/expressjs/session#session-store-implementation>@4.x for full details
Example
=======
Standalone / Master Mode is in-process
========================
```javascript
'use strict';
The `master` in the cluster (meaning `opts.serve = true`) will directly hold the specified store
(a simple memory store by default, or `express-session/session/memory` in the example above)
var cluster = require('cluster');
Likewise, when only one process is being used (`opts.standalone = true`) the listener is
not started and API is completely in-process.
require('cluster-store').create({
name: 'foo-store'
}).then(function (store) {
if (cluster.isMaster) {
store.set('foo', 'bar');
}
If you take a look at `memstore.js` you'll see that it's a rather simple memory store instance.
store.get('foo', function (err, result) {
console.log(result);
});
});
Security Warning
================
if (cluster.isMaster) {
cluster.fork();
cluster.fork();
}
```
Note that any application on the system could connect to the socket.
In the future I may add a `secret` field in the options object to be
used for authentication across processes. This would not be difficult,
it's just not necessary for my use case at the moment.

199
client.js Normal file
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@ -0,0 +1,199 @@
'use strict';
/*global Promise*/
function startServer(opts) {
return require('./server').create(opts).then(function (server) {
// this process doesn't need to connect to itself
// through a socket
return server.masterClient;
});
}
function getConnection(opts) {
return new Promise(function (resolve) {
//setTimeout(function () {
var WebSocket = require('ws');
var ws = new WebSocket('ws+unix:' + opts.sock);
ws.on('error', function (err) {
console.error('[ERROR] ws connection failed, retrying');
console.error(err);
function retry() {
setTimeout(function () {
getConnection(opts).then(resolve, retry);
}, 100 + (parseInt(require('crypto').randomBytes(2).toString('hex'), 16) % 250));
}
if (!opts.connect && ('ENOENT' === err.code || 'ECONNREFUSED' === err.code)) {
console.log('[NO SERVER] attempting to create a server #######################');
return startServer(opts).then(function (client) {
// ws.masterClient = client;
resolve({ masterClient: client });
}, function () {
retry();
});
}
retry();
});
/*
ws.on('open', function () {
resolve(ws);
});
*/
ws.___listeners = [];
ws.on('message', function (data) {
ws.___listeners.forEach(function (fn) {
try {
fn(data);
} catch(e) {
console.error("[ERROR] ws.on('message', fn) (multi-callback)");
console.error(e);
// ignore
}
});
});
function onInitMessage(str) {
// TODO there's no way to remove a listener... what to do?
var data;
try {
data = JSON.parse(str);
} catch(e) {
console.error('[ERROR]');
console.error(e);
}
if ('methods' !== data.type) {
return;
}
var index = ws.___listeners.indexOf(onInitMessage);
ws.___listeners.splice(index, 1);
ws._methods = data.methods;
resolve(ws);
}
ws.___listeners.push(onInitMessage);
//}, 100 + (Math.random() * 250));
});
}
function create(opts) {
if (!opts.sock) {
opts.sock = '/tmp/memstore' + '.sock';
}
var promise;
var numcpus = require('os').cpus().length;
if (opts.standalone || (1 === numcpus && !opts.serve && !opts.connect)) {
return require('./memstore').create(opts);
}
function retryServe() {
return startServer(opts).then(function (client) {
// ws.masterClient = client;
return { masterClient: client };
}, function (err) {
console.error('[ERROR] retryServe()');
console.error(err);
retryServe();
});
}
if (opts.serve) {
promise = retryServe();
} else {
promise = getConnection(opts);
}
// TODO maybe use HTTP POST instead?
return promise.then(function (ws) {
if (ws.masterClient) {
return ws.masterClient;
}
var db = {};
function rpc(fname, args) {
var id;
var cb;
if ('function' === typeof args[args.length - 1]) {
// TODO if off, search for cb and derive id from previous onMessage
id = require('crypto').randomBytes(16).toString('hex');
cb = args.pop();
}
ws.send(JSON.stringify({
type: 'rpc'
, func: fname
, args: args
, hasCallback: !!cb
, filename: opts.filename
, id: id
}));
if (!cb) {
return;
}
function onMessage(data) {
var cmd;
try {
cmd = JSON.parse(data.toString('utf8'));
} catch(e) {
console.error('[ERROR] in client, from sql server parse json');
console.error(e);
console.error(data);
console.error();
//ws.send(JSON.stringify({ type: 'error', value: { message: e.message, code: "E_PARSE_JSON" } }));
return;
}
if (cmd.id !== id) {
return;
}
/*
// TODO not sure how to handle 'emit' or 'off'...
// it'll just be broken for now
if ('off' === fname || 'remove.*Listener'.test(fname)) {
var index = ws.___listeners.indexOf(onMessage);
ws.___listeners.splice(index, 1);
}
*/
if ('on' !== fname && ! /add.*Listener/.test(fname)) {
var index = ws.___listeners.indexOf(onMessage);
ws.___listeners.splice(index, 1);
}
cb.apply(cmd.this, cmd.args);
}
// TODO search index by cb for 'off'
// and pass it along to the rpc with the original id
onMessage.__cb = cb;
onMessage.__id = id;
ws.___listeners.push(onMessage);
}
ws._methods.forEach(function (key) {
db[key] = function () {
rpc(key, Array.prototype.slice.call(arguments));
};
});
return db;
});
}
module.exports.create = create;

20
cluster.js Normal file
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@ -0,0 +1,20 @@
'use strict';
var memstore = require('./index');
function create(opts) {
var cluster = require('cluster');
var numCores = require('os').cpus().length;
if (!opts.serve && ('boolean' !== typeof opts.serve)) {
opts.serve = (numCores > 1) && cluster.isMaster;
}
if (!opts.connect && ('boolean' !== typeof opts.connect)) {
opts.connect = (numCores > 1) && cluster.isWorker;
}
return memstore.create(opts);
}
module.exports.create = create;

8
index.js
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@ -1,9 +1,3 @@
'use strict';
var cluster = require('cluster');
if (cluster.isMaster) {
module.exports = require('./master');
} else {
module.exports = require('./worker');
}
module.exports = require('./client');

19
master.js
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@ -1,19 +0,0 @@
'use strict';
module.exports.create = function (opts) {
opts = opts || {};
var db = require('./memstore').create();
return require('cluster-rpc/master').create({
instance: opts.store || db
, methods: [
'set', 'get', 'touch', 'destroy'
, 'all', 'length', 'clear'
, 'on', 'off', 'removeEventListener', 'addEventListener'
]
, name: 'memstore.' + (opts.name || '')
, master: opts.master
, addOnFork: opts.addOnFork
});
};

19
memstore.js
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@ -9,30 +9,19 @@ if ('function' === typeof setImmediate) {
defer = function (fn) { process.nextTick(fn.bind.apply(fn, arguments)); };
}
function create(opts) {
opts = opts || {};
function create(/*opts*/) {
// don't leak prototypes as implicitly non-null
var db = Object.create(null);
function log() {
if (!opts.debug) {
return;
}
console.log.apply(console, arguments);
}
return {
return Promise.resolve({
// required / recommended
set: function (id, data, fn) {
log('set(id, data)', id, data);
db[id] = data;
if (!fn) { return; }
defer(fn, null);
}
, get: function (id, fn) {
log('get(id)', id);
if (!fn) { return; }
defer(fn, null, 'undefined' === typeof db[id] ? null : db[id]);
}
@ -43,7 +32,6 @@ function create(opts) {
defer(fn, null);
}
, destroy: function (id, fn) {
log('destroy(id)', id);
delete db[id];
if (!fn) { return; }
@ -61,13 +49,12 @@ function create(opts) {
defer(fn, null, Object.keys(db).length);
}
, clear: function (fn) {
log('clear()', id);
db = Object.create(null);
if (!fn) { return; }
defer(fn, null);
}
};
});
}
module.exports.create = create;

20
package.json
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@ -1,8 +1,7 @@
{
"name": "cluster-store",
"version": "2.0.8",
"description": "A wrapper to enable the use of any in-process store with node cluster via cluster process and worker messages (i.e. for Raspberry Pi servers).",
"homepage": "https://git.coolaj86.com/coolaj86/cluster-store.js",
"version": "1.0.3",
"description": "A wrapper to enable the use of a in-process store with node cluster via a socket server (i.e. for Raspberry Pi 2).",
"main": "index.js",
"scripts": {
"test": "node test-cluster.js",
@ -10,10 +9,8 @@
},
"repository": {
"type": "git",
"url": "git+https://git.coolaj86.com/coolaj86/cluster-store.js.git"
"url": "git+https://github.com/coolaj86/cluster-store.git"
},
"bundleDependencies": false,
"deprecated": false,
"keywords": [
"store",
"session",
@ -23,16 +20,13 @@
"cluster",
"rpi2"
],
"author": {
"name": "AJ ONeal",
"email": "coolaj86@gmail.com",
"url": "https://coolaj86.com/"
},
"author": "AJ ONeal <coolaj86@gmail.com> (http://coolaj86.com/)",
"license": "Apache-2.0",
"bugs": {
"url": "https://git.coolaj86.com/coolaj86/cluster-store.js/issues"
"url": "https://github.com/coolaj86/cluster-store/issues"
},
"homepage": "https://github.com/coolaj86/cluster-store#readme",
"dependencies": {
"cluster-rpc": "^v1.0.6"
"ws": "^0.8.0"
}
}

150
server.js Normal file
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@ -0,0 +1,150 @@
'use strict';
/*global Promise*/
var wsses = {};
function createApp(server, options) {
var promise;
if (wsses[options.filename]) {
return Promise.resolve(wsses[options.filename]);
}
if (options.store) {
promise = Promise.resolve(options.store);
} else {
promise = require('./memstore').create(options);
}
return promise.then(function (db) {
var url = require('url');
//var express = require('express');
//var app = express();
var wss = server.wss;
function app(req, res) {
res.end('NOT IMPLEMENTED');
}
function getMethods(db) {
/*
var instanceMethods = Object.keys(db)
.map(function (key) { return 'function' === typeof db[key] ? key : null; })
.filter(function (key) { return key; })
;
var protoMethods = Object.keys(Object.getPrototypeOf(db))
.map(function (key) { return 'function' === typeof Object.getPrototypeOf(db)[key] ? key : null; })
.filter(function (key) { return key; })
;
return instanceMethods.concat(protoMethods);
*/
return [
'set', 'get', 'touch', 'destroy'
, 'all', 'length', 'clear'
, 'emit', 'on', 'off', 'once'
, 'removeListener', 'addListener'
, 'removeEventListener', 'addEventListener'
].filter(function (key) {
if ('function' === typeof db[key]) {
return true;
}
});
}
wss.on('connection', function (ws) {
ws.send(JSON.stringify({
type: 'methods'
, methods: getMethods(db)
}));
var location = url.parse(ws.upgradeReq.url, true);
// you might use location.query.access_token to authenticate or share sessions
// or ws.upgradeReq.headers.cookie (see http://stackoverflow.com/a/16395220/151312
ws.__session_id = location.query.session_id || require('crypto').randomBytes(16).toString('hex');
ws.on('message', function (buffer) {
var cmd;
try {
cmd = JSON.parse(buffer.toString('utf8'));
} catch(e) {
console.error('[ERROR] parse json');
console.error(e);
console.error(buffer);
console.error();
ws.send(JSON.stringify({ type: 'error', value: { message: e.message, code: "E_PARSE_JSON" } }));
return;
}
switch(cmd.type) {
case 'init':
break;
case 'rpc':
if (cmd.hasCallback) {
cmd.args.push(function () {
var args = Array.prototype.slice.call(arguments);
ws.send(JSON.stringify({
this: this
, args: args
, id: cmd.id
}));
});
// TODO handle 'off' by id
cmd.args[cmd.args.length - 1].__id = cmd.id;
}
db[cmd.func].apply(db, cmd.args);
break;
default:
throw new Error('UNKNOWN TYPE');
//break;
}
});
ws.send(JSON.stringify({ type: 'session', value: ws.__session_id }));
});
app.masterClient = db;
//wsses[options.filename] = app;
return app;
});
}
function create(options) {
var server = require('http').createServer();
var WebSocketServer = require('ws').Server;
var wss = new WebSocketServer({ server: server });
//var port = process.env.PORT || process.argv[0] || 4080;
var fs = require('fs');
var ps = [];
ps.push(new Promise(function (resolve) {
fs.unlink(options.sock, function () {
// ignore error when socket doesn't exist
server.listen(options.sock, resolve);
});
}));
ps.push(createApp({ server: server, wss: wss }, options).then(function (app) {
server.on('request', app);
return { masterClient: app.masterClient };
}));
return Promise.all(ps).then(function (results) {
return results[1];
});
}
module.exports.create = create;

26
simplest.js
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@ -1,26 +0,0 @@
'use strict';
var cluster = require('cluster');
var cstore;
require('./').create({
name: 'foo-store'
}).then(function (store) {
if (cluster.isMaster) {
cluster.fork();
cluster.fork();
store.set('foo', 'bar');
}
store.get('foo', function (err, result) {
console.log(cluster.isMaster && '0' || cluster.worker.id.toString(), 'foo', result);
if (!cluster.isMaster) {
process.exit(0);
}
});
});
process.on('unhandledRejection', function (err) {
console.log('unhandledRejection', err);
});

15
standalone.js Normal file
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@ -0,0 +1,15 @@
'use strict';
var memstore = require('./index');
function create(opts) {
opts.standalone = true;
// TODO if cluster *is* used issue a warning?
// I suppose the user could be issuing a different filename for each
// ... but then they have no need to use this module, right?
return memstore.create(opts);
}
module.exports.create = create;

67
test-cluster.js Normal file
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'use strict';
var cluster = require('cluster');
var numCores = 2;
//var numCores = require('os').cpus().length;
var id = (cluster.isMaster && '0' || cluster.worker.id).toString();
function run() {
var mstore = require('./cluster');
return mstore.create({
standalone: null
, serve: null
, connect: null
}).then(function (store) {
store.set('foo', 'bar', function (err) {
if (err) { console.error(err); return; }
store.get('baz', function (err, data) {
if (err) { console.error(err); return; }
if (null !== data) {
console.error(id, 'should be null:', data);
}
});
store.get('foo', function (err, data) {
if (err) { console.error(err); return; }
if ('bar' !== data) {
console.error(id, 'should be bar:', data);
}
store.set('quux', { message: 'hey' }, function (/*err*/) {
store.get('quux', function (err, data) {
if (err) { console.error(err); return; }
if (!data || 'hey' !== data.message) {
console.error(id, "should be { message: 'hey' }:", data);
} else {
console.log('Are there any errors above? If not, we passed!');
}
});
});
});
});
});
}
if (cluster.isMaster) {
// not a bad idea to setup the master before forking the workers
run().then(function () {
var i;
for (i = 1; i <= numCores; i += 1) {
cluster.fork();
}
});
} else {
run();
}
// The native Promise implementation ignores errors because... dumbness???
process.on('unhandledPromiseRejection', function (err) {
console.error('Unhandled Promise Rejection');
console.error(err);
console.error(err.stack);
process.exit(1);
});

37
test-standalone.js Normal file
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'use strict';
function run() {
var mstore = require('./standalone');
mstore.create({
sock: '/tmp/memstore.sock'
, standalone: null
, serve: null
, connect: null
}).then(function (store) {
store.set('foo', 'bar', function (err) {
if (err) { console.error(err); return; }
store.get('baz', function (err, data) {
if (err) { console.error(err); return; }
console.log('should be null:', data);
});
store.get('foo', function (err, data) {
if (err) { console.error(err); return; }
console.log('should be bar:', data);
});
});
});
}
run();
// The native Promise implementation ignores errors because... dumbness???
process.on('unhandledPromiseRejection', function (err) {
console.error('Unhandled Promise Rejection');
console.error(err);
console.error(err.stack);
process.exit(1);
});

48
test.js
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@ -1,48 +0,0 @@
'use strict';
var cluster = require('cluster');
var cstore;
//global.Promise = require('bluebird');
if (cluster.isMaster) {
cstore = require('./master').create({
name: 'foo-level'
});
cstore.then(function (db) {
db.set('foo', 'bar');
});
cluster.fork();
cluster.fork();
}
else {
cstore = require('./worker').create({
name: 'foo-level'
});
}
cstore.then(function (db) {
setTimeout(function () {
db.get('foo', function (err, result) {
console.log(cluster.isMaster && '0' || cluster.worker.id.toString(), "db.get('foo')", result);
if (!cluster.isMaster) {
process.exit(0);
}
});
}, 250);
});
process.on('unhandledRejection', function (err) {
console.log('unhandledRejection', err);
});

8
worker.js
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@ -1,8 +0,0 @@
'use strict';
module.exports.create = function (opts) {
return require('cluster-rpc/worker').create({
name: 'memstore.' + (opts.name || '')
, worker: opts.worker
});
};