func natsOptions(logger lager.Logger, c *config.Config, natsHost *atomic.Value, startMsg chan<- struct{}) nats.Options {
natsServers := c.NatsServers()
options := nats.DefaultOptions
options.Servers = natsServers
options.PingInterval = c.NatsClientPingInterval
options.ClosedCB = func(conn *nats.Conn) {
logger.Fatal("nats-connection-closed", errors.New("unexpected close"), lager.Data{"last_error": conn.LastError()})
}
options.DisconnectedCB = func(conn *nats.Conn) {
hostStr := natsHost.Load().(string)
logger.Info("nats-connection-disconnected", lager.Data{"nats-host": hostStr})
}
options.ReconnectedCB = func(conn *nats.Conn) {
natsURL, err := url.Parse(conn.ConnectedUrl())
natsHostStr := ""
if err != nil {
logger.Error("nats-url-parse-error", err)
} else {
natsHostStr = natsURL.Host
}
natsHost.Store(natsHostStr)
data := lager.Data{"nats-host": natsHostStr}
logger.Info("nats-connection-reconnected", data)
startMsg <- struct{}{}
}
// in the case of suspending pruning, we need to ensure we retry reconnects indefinitely
if c.SuspendPruningIfNatsUnavailable {
options.MaxReconnect = -1
}
return options
}
