edu-connect-redis

connect-redis is a Redis session store backed by node_redis, and is insanely fast :). Requires redis >= 2.0.0 for the SETEX command.

Setup

npm install connect-redis express-session

Pass the express-session store into connect-redis to create a RedisStore constructor.

var session = require('express-session');
var RedisStore = require('connect-redis')(session);

app.use(session({
    store: new RedisStore(options),
    secret: 'keyboard cat'
}));

Options

A Redis client is required. An existing client can be passed directly using the client param or created for you using the host, port, or socket params.

• client An existing client
• host Redis server hostname
• port Redis server portno
• socket Redis server unix_socket
• url Redis server url

The following additional params may be included:

• ttl Redis session TTL (expiration) in seconds. Defaults to session.maxAge (if set), or one day.
• disableTTL Disables setting TTL, keys will stay in redis until evicted by other means (overides ttl)
• db Database index to use. Defaults to Redis's default (0).
• pass Password for Redis authentication
• prefix Key prefix defaulting to "sess:"
• unref Set true to unref the Redis client. Warning: this is an experimental feature.
• serializer An object containing stringify and parse methods compatible with Javascript's JSON to override the serializer used
• logErrors Whether or not to log client errors. (default: false)
  • If true, a default logging function (console.error) is provided.
  • If a function, it is called anytime an error occurs (useful for custom logging)
  • If false, no logging occurs.

Any options not included in this list will be passed to the redis createClient() method directly.

Custom Redis clients

Clients other than node_redis will work if they support the same interface. Just pass the client instance as the client configuration option. Known supported clients include:

• ioredis - adds support for Redis Sentinel and Cluster

FAQ

How do I handle lost connections to Redis?

By default, the node_redis client will auto-reconnect when a connection is lost. But requests may come in during that time. In express, one way this scenario can be handled is including a "session check" after setting up a session (checking for the existence of req.session):

app.use(session( /* setup session here */ ))
app.use(function (req, res, next) {
  if (!req.session) {
    return next(new Error('oh no')) // handle error
  }
  next() // otherwise continue
})

If you want to retry, here is another option.

License

MIT