Connecting to NATS Streaming

NATS Streaming is a service on top of NATS. To connect to the service you first connect to NATS and then use the client library to communicate with the server over your NATS connection. Most of the libraries provide a convenience mechanism for connecting in a single step. These convenience methods will take some NATS options, like the server, and perform the NATS connection first, then then run the protocol to connect to the streaming server.

Connecting to a streaming server requires a cluster id, defined by the server configuration, and a client ID defined by the client.

sc, err := stan.Connect(clusterID, clientID, stan.NatsURL(“nats://localhost:4222”))

Sometimes you may want to provide NATS settings that aren't available in the streaming libraries connect method. Or, you may want to reuse a NATS connection instead of creating a new one. In this case the libraries generally provide a way to connect to streaming with an existing NATS connection:

sc, err := stan.Connect(clusterID, clientID, stan.NatsConn(nc))