156 lines
3.2 KiB
Markdown
156 lines
3.2 KiB
Markdown
cluster-store
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=============
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Makes any storage strategy similar to `express/session` useful in both `cluster` and non-`cluster` environments
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by wrapping it with `cluster-rpc`.
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Also works with **level-session-store** (leveldb), **connect-session-knex** (SQLite3), **session-file-store** (fs),
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and any other embedded / in-process store.
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Note: Most people would probably prefer to just use Redis rather than wrap a dumb memstore as a service...
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but I am not most people.
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Install
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=======
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```
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npm install --save cluster-store@2.x
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```
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v1.x vs v2.x
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------------
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The [old v1](https://github.com/coolaj86/cluster-store/tree/v1.x)
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used `ws` which makes it usable when clustering node processes without using `cluster`.
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If you need that functionaliy, use v1 instead of v2.
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Usage
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=====
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### standalone (non-cluster)
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--------------
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The usage is exactly the same as **master**, no changes necessary.
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### master
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In the **master**/**standalone** process you will create the real store instance
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and then in the you must pass each worker via `addWorker()` so that it signals
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the worker to create its own rpc-wrapped instance.
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```javascript
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'use strict';
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var cluster = require('cluster');
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var cstore = require('cluster-store/master').create({
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name: 'foo-store'
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, store: null // use default in-memory store
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});
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cstore.addWorker(cluster.fork());
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cstore.then(function (store) {
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store.set('foo', 'bar');
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});
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```
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Note: `store` can be replaced with any `express/session` store, such as:
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* `new require('express-session/session/memory')()`
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* `require('level-session-store')(session)`
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* and others
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### worker
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```javascript
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'use strict';
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// retrieve the instance
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var cstore = require('cluster-store/worker').create({
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name: 'foo-store'
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});
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cstore.then(function (store) {
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store.get('foo', function (err, result) {
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console.log(result);
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});
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});
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```
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API
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===
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This is modeled after Express'
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[Session Store Implementation](https://github.com/expressjs/session#session-store-implementation)
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**Note**: These are only exposed if the underlying store supports them.
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CRUD methods
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------------
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* `store.set(id, data, fn) => (error)`
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* `store.get(id, fn) => (error, data)`
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* `store.touch(id, data, fn) => (error)`
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* `store.destroy(id, fn) => (error)`
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Helpers
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-------
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* `store.all(fn) => (error, array)`
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* `store.clear(fn) => (error)`
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* `store.length(fn) => (error, length)`
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See <https://github.com/expressjs/session#session-store-implementation>@4.x for full details
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Example
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=======
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```javascript
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'use strict';
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var cluster = require('cluster');
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var cstore;
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if (cluster.isMaster) {
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cstore = require('./master').create({
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name: 'foo-level'
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});
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cstore.addWorker(cluster.fork());
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cstore.then(function (store) {
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store.put('foo', 'bar');
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});
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}
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else {
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cstore = require('./worker').create({
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name: 'foo-level'
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});
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}
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cstore.then(function (store) {
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setTimeout(function () {
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store.get('foo', function (err, result) {
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console.log(cluster.isMaster && '0' || cluster.worker.id.toString(), "store.get('foo')", result);
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if (!cluster.isMaster) {
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process.exit(0);
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}
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});
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}, 250);
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});
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process.on('unhandledRejection', function (err) {
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console.log('unhandledRejection', err);
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});
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```
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