func NewFromMethod(method *amqp.ExchangeDeclare, system bool, exchangeDeleter chan *Exchange) (*Exchange, *amqp.AMQPError) {
var classId, methodId = method.MethodIdentifier()
var tp, err = ExchangeNameToType(method.Type)
if err != nil || tp == EX_TYPE_HEADERS {
return nil, amqp.NewHardError(503, "Bad exchange type", classId, methodId)
}
var ex = NewExchange(
method.Exchange,
tp,
method.Durable,
method.AutoDelete,
method.Internal,
method.Arguments,
system,
exchangeDeleter,
)
return ex, nil
}
func (channel *Channel) exchangeDeclare(method *amqp.ExchangeDeclare) *amqp.AMQPError {
var classId, methodId = method.MethodIdentifier()
// The client I'm using for testing thought declaring the empty exchange
// was OK. Check later
// if len(method.Exchange) > 0 && !method.Passive {
// var msg = "The empty exchange name is reserved"
// channel.channelErrorWithMethod(406, msg, classId, methodId)
// return nil
// }
// Check the name format
var err = amqp.CheckExchangeOrQueueName(method.Exchange)
if err != nil {
return amqp.NewSoftError(406, err.Error(), classId, methodId)
}
// Declare!
var ex, amqpErr = exchange.NewFromMethod(method, false, channel.server.exchangeDeleter)
if amqpErr != nil {
return amqpErr
}
tp, err := exchange.ExchangeNameToType(method.Type)
if err != nil || tp == exchange.EX_TYPE_HEADERS {
return amqp.NewHardError(503, err.Error(), classId, methodId)
}
existing, hasKey := channel.server.exchanges[ex.Name]
if !hasKey && method.Passive {
return amqp.NewSoftError(404, "Exchange does not exist", classId, methodId)
}
if hasKey {
// if diskLoad {
// panic(fmt.Sprintf("Can't disk load a key that exists: %s", ex.Name))
// }
if existing.ExType != ex.ExType {
return amqp.NewHardError(530, "Cannot redeclare an exchange with a different type", classId, methodId)
}
if existing.EquivalentExchanges(ex) {
if !method.NoWait {
channel.SendMethod(&amqp.ExchangeDeclareOk{})
}
return nil
}
// Not equivalent, error in passive mode
if method.Passive {
return amqp.NewSoftError(406, "Exchange with this name already exists", classId, methodId)
}
}
if method.Passive {
if !method.NoWait {
channel.SendMethod(&amqp.ExchangeDeclareOk{})
}
return nil
}
// outside of passive mode you can't create an exchange starting with
// amq.
if strings.HasPrefix(method.Exchange, "amq.") {
return amqp.NewSoftError(403, "Exchange names starting with 'amq.' are reserved", classId, methodId)
}
err = channel.server.addExchange(ex)
if err != nil {
return amqp.NewSoftError(500, err.Error(), classId, methodId)
}
err = ex.Persist(channel.server.db)
if err != nil {
return amqp.NewSoftError(500, err.Error(), classId, methodId)
}
if !method.NoWait {
channel.SendMethod(&amqp.ExchangeDeclareOk{})
}
return nil
}