// Connects to the message queue, opens a channel, declares a queue
func (amqpBroker *AMQPBroker) open() (*amqp.Connection, *amqp.Channel, amqp.Queue, <-chan amqp.Confirmation, error) {
var conn *amqp.Connection
var channel *amqp.Channel
var queue amqp.Queue
var err error
conn, err = amqp.Dial(amqpBroker.config.Broker)
if err != nil {
return conn, channel, queue, nil, fmt.Errorf("Dial: %s", err)
}
channel, err = conn.Channel()
if err != nil {
return conn, channel, queue, nil, fmt.Errorf("Channel: %s", err)
}
if err := channel.ExchangeDeclare(
amqpBroker.config.Exchange, // name of the exchange
amqpBroker.config.ExchangeType, // type
true, // durable
false, // delete when complete
false, // internal
false, // noWait
nil, // arguments
); err != nil {
return conn, channel, queue, nil, fmt.Errorf("Exchange: %s", err)
}
queue, err = channel.QueueDeclare(
amqpBroker.config.DefaultQueue, // name
true, // durable
false, // delete when unused
false, // exclusive
false, // no-wait
nil, // arguments
)
if err != nil {
return conn, channel, queue, nil, fmt.Errorf("Queue Declare: %s", err)
}
if err := channel.QueueBind(
queue.Name, // name of the queue
amqpBroker.config.BindingKey, // binding key
amqpBroker.config.Exchange, // source exchange
false, // noWait
nil, // arguments
); err != nil {
return conn, channel, queue, nil, fmt.Errorf("Queue Bind: %s", err)
}
confirmsChan := make(chan amqp.Confirmation, 1)
// Enable publish confirmations
if err := channel.Confirm(false); err != nil {
close(confirmsChan)
return conn, channel, queue, nil, fmt.Errorf("Channel could not be put into confirm mode: %s", err)
}
return conn, channel, queue, channel.NotifyPublish(confirmsChan), nil
}
// Closes the connection
func (amqpBroker *AMQPBroker) close(channel *amqp.Channel, conn *amqp.Connection) error {
if err := channel.Close(); err != nil {
return fmt.Errorf("Channel Close: %s", err)
}
if err := conn.Close(); err != nil {
return fmt.Errorf("Connection Close: %s", err)
}
return nil
}
// Connects to the message queue, opens a channel, declares a queue
func (amqpBackend *AMQPBackend) open(taskUUID string) (*amqp.Connection, *amqp.Channel, amqp.Queue, <-chan amqp.Confirmation, error) {
var conn *amqp.Connection
var channel *amqp.Channel
var queue amqp.Queue
var err error
conn, err = amqp.Dial(amqpBackend.config.ResultBackend)
if err != nil {
return conn, channel, queue, nil, fmt.Errorf("Dial: %s", err)
}
channel, err = conn.Channel()
if err != nil {
return conn, channel, queue, nil, fmt.Errorf("Channel: %s", err)
}
err = channel.ExchangeDeclare(
amqpBackend.config.Exchange, // name of the exchange
amqpBackend.config.ExchangeType, // type
true, // durable
false, // delete when complete
false, // internal
false, // noWait
nil, // arguments
)
if err != nil {
return conn, channel, queue, nil, fmt.Errorf("Exchange: %s", err)
}
resultsExpireIn := amqpBackend.config.ResultsExpireIn * 1000
if resultsExpireIn == 0 {
// // expire results after 1 hour by default
resultsExpireIn = 3600 * 1000
}
arguments := amqp.Table{
"x-message-ttl": int32(resultsExpireIn),
}
queue, err = channel.QueueDeclare(
taskUUID, // name
false, // durable
true, // delete when unused
false, // exclusive
false, // no-wait
arguments,
)
if err != nil {
return conn, channel, queue, nil, fmt.Errorf("Queue Declare: %s", err)
}
if err := channel.QueueBind(
queue.Name, // name of the queue
taskUUID, // binding key
amqpBackend.config.Exchange, // source exchange
false, // noWait
nil, // arguments
); err != nil {
return conn, channel, queue, nil, fmt.Errorf("Queue Bind: %s", err)
}
confirmsChan := make(chan amqp.Confirmation, 1)
// Enable publish confirmations
if err := channel.Confirm(false); err != nil {
close(confirmsChan)
return conn, channel, queue, nil, fmt.Errorf("Channel could not be put into confirm mode: %s", err)
}
return conn, channel, queue, channel.NotifyPublish(confirmsChan), nil
}