/*
If ch is nil, a new Connection and Channel will be created, and this publisher
will 'own' the connection. A call to close() will close both channel and connection.
If ch is provided, then this publisher will reuse the channel and
calls to close() will do nothing.
*/
func newPublisher(serverURI string, cfg *ChannelConfig, ch *amqp.Channel) *Publisher {
var conn *amqp.Connection
var err error
if ch == nil {
conn, err = amqp.Dial(serverURI)
if err != nil {
panic(fmt.Errorf("Failed to connect to RabbitMQ: %v", err))
}
ch, err = conn.Channel()
if err != nil {
panic(fmt.Errorf("Failed to open a channel: %v", err))
}
}
_, err = ch.QueueDeclare(*cfg.Name, *cfg.Durable, *cfg.AutoDelete, *cfg.Exclusive, false, *cfg.Args)
if err != nil {
panic(fmt.Errorf("Failed to declare queue %s: %v", cfg.Name, err))
}
ch.QueuePurge(*cfg.Name, true)
return &Publisher{exch: "", routingKey: *cfg.Name, conn: conn, ch: ch, typeTag: *cfg.TypeTag}
}