MattCollins84 / simple-cache-service

Simple Caching Service

simple-cache-service

A simple Node.js app that uses an optional attached Redis](http://redis.io/) database to provide a simple key/value cache service, via an HTTP API.

If no Redis database is provided, then data will be cached in memory but this is not recommended for large datasets.

Running the app on Bluemix

To come...

Running the app locally

Clone this repository then run npm install to add the Node.js libraries required to run the app.

To enable caching via Redis, you will also need to have access to a Redis server (either running locally, or elsewhere).

You will then need to set some environemt variables to tell the Simple Cache Service how to connect to your Redis server:

• export SCS_REDIS_HOST='127.0.0.1:6379' - This is required, but does not have to be localhost
• export SCS_REDIS_PASSWORD='redis_password' - This is not required, depends on your Redis server

Then run:

node app.js

API

The app exposes a simple HTTP API to allow the manipulation of keys/values that are cached.

POST /key/:key

To set a key, make a request to POST /key/yourkeyname and provide the value in the request body, as shown below:

curl -x POST http://cache.example.com/key/foo -d'value=bar'

This will return a JSON response:

{
  "success": true,
  "data": "OK"
}

Keys will persist for an hour, and then expire.

GET /key/:key

To get a key, make a request to GET /key/yourkeyname.

curl -x GET http://cache.example.com/key/foo

This will return a JSON response:

{
  "success": true,
  "data": "bar"
}

DELETE /key/:key

To delete a key, make a request to DELETE /key/yourkeyname.

curl -x DELETE http://cache.example.com/key/foo

Remove all keys

To delete all keys, make a request to POST /clearall

curl -x POST http://cache.example.com/clearall

Service Registry

The Service Registry allows the Simple Cache Service to be utilised by the Simple Search Service to implement caching of searches. This is achieved by using the Simple Service Registry module.

Enabling the Service Registry

Enabling the Service Registry mode requires setting an environment variable, ETCD_URL. This should be the URL of your Etcd instance including any basic HTTP authentication information

export ETCD_URL='http://username:[e-mail]'

If the Service Registry is enabled, the Simple Cache Service will become discoverable by the Simple Search Service.

Contributing

The projected is released under the Apache-2.0 license so forks, issues and pull requests are very welcome.