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.gitignore vendored
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@ -1,7 +1,6 @@
# Logs # Logs
logs logs
*.log *.log
npm-debug.log*
# Runtime data # Runtime data
pids pids
@ -14,9 +13,6 @@ lib-cov
# Coverage directory used by tools like istanbul # Coverage directory used by tools like istanbul
coverage coverage
# nyc test coverage
.nyc_output
# Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files) # Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
.grunt .grunt
@ -26,12 +22,6 @@ coverage
# Compiled binary addons (http://nodejs.org/api/addons.html) # Compiled binary addons (http://nodejs.org/api/addons.html)
build/Release 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 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 TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
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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 A very simple in-memory object store for use with node cluster
by wrapping it with `cluster-rpc`. (or even completely and unrelated node processes).
Also works with **level-session-store** (leveldb), **connect-session-knex** (SQLite3), **session-file-store** (fs), Node.js runs on a single core, which isn't very effective.
and any other embedded / in-process store.
Note: Most people would probably prefer to just use Redis rather than wrap a dumb memstore as a service... You can run multiple Node.js instances to take advantage of multiple cores,
but I am not most people. 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+).
``` **Note**: Most people would probably prefer to just use Redis rather than
npm install --save cluster-store@2.x wrap a dumb memstore as a service... but I am not most people.
```
v1.x vs v2.x Also works with **level-session-store** (leveldb), **connect-session-knex** (SQLite3),
------------ **session-file-store** (fs), and any other embedded / in-process store.
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.
Usage Usage
===== =====
In its simplest form, you use this module nearly exactly the way you would The default behavior is to try to connect to a master and, if that fails, to become the master.
the any other storage module, with the exception that you must wait for
the inter-process initialization to complete.
When not using any of the options the usage is the same for the master and the worker: However, if you are in fact using the `cluster` rather than spinning up random instances,
you'll probably prefer to use this pattern:
```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';
```js
var cluster = require('cluster'); var cluster = require('cluster');
var cstore = require('cluster-store');
var numCores = require('os').cpus().length;
var cstore = require('cluster-store/master').create({ var opts = {
name: 'foo-store' // necessary when using multiple instances sock: '/tmp/memstore.sock'
, store: null // use default in-memory store
, addOnFork: true // default
});
// if you addOnFork is set to false you can add specific forks manually // If left 'null' or 'undefined' this defaults to a similar memstore
//cstore.addWorker(cluster.fork()); // with no special logic for 'cookie' or 'expires'
, store: cluster.isMaster && new require('express-session/session/memory')()
cstore.then(function (store) { // a good default to use for instances where you might want
store.set('foo', 'bar'); // 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')()` store.get(id, function (err, data) {
* `require('level-session-store')(session)` console.log(data);
* 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);
}); });
// 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 API
=== ===
@ -124,28 +94,22 @@ Helpers
See <https://github.com/expressjs/session#session-store-implementation>@4.x for full details See <https://github.com/expressjs/session#session-store-implementation>@4.x for full details
Example Standalone / Master Mode is in-process
======= ========================
```javascript The `master` in the cluster (meaning `opts.serve = true`) will directly hold the specified store
'use strict'; (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({ If you take a look at `memstore.js` you'll see that it's a rather simple memory store instance.
name: 'foo-store'
}).then(function (store) {
if (cluster.isMaster) {
store.set('foo', 'bar');
}
store.get('foo', function (err, result) { Security Warning
console.log(result); ================
});
});
if (cluster.isMaster) { Note that any application on the system could connect to the socket.
cluster.fork();
cluster.fork(); 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'; 'use strict';
var cluster = require('cluster'); module.exports = require('./client');
if (cluster.isMaster) {
module.exports = require('./master');
} else {
module.exports = require('./worker');
}

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

20
package.json
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@ -1,8 +1,7 @@
{ {
"name": "cluster-store", "name": "cluster-store",
"version": "2.0.8", "version": "1.0.3",
"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).", "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).",
"homepage": "https://git.coolaj86.com/coolaj86/cluster-store.js",
"main": "index.js", "main": "index.js",
"scripts": { "scripts": {
"test": "node test-cluster.js", "test": "node test-cluster.js",
@ -10,10 +9,8 @@
}, },
"repository": { "repository": {
"type": "git", "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": [ "keywords": [
"store", "store",
"session", "session",
@ -23,16 +20,13 @@
"cluster", "cluster",
"rpi2" "rpi2"
], ],
"author": { "author": "AJ ONeal <coolaj86@gmail.com> (http://coolaj86.com/)",
"name": "AJ ONeal",
"email": "coolaj86@gmail.com",
"url": "https://coolaj86.com/"
},
"license": "Apache-2.0", "license": "Apache-2.0",
"bugs": { "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": { "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
});
};