/
rabbitmq.go
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/
rabbitmq.go
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package internal
import (
"github.com/streadway/amqp"
"github.com/ryanpfalz/go-openapi/internal"
"github.com/ryanpfalz/go-openapi/internal/envvar"
)
// RabbitMQ ...
type RabbitMQ struct {
Connection *amqp.Connection
Channel *amqp.Channel
}
// NewRabbitMQ instantiates the RabbitMQ instances using configuration defined in environment variables.
func NewRabbitMQ(conf *envvar.Configuration) (*RabbitMQ, error) {
// XXX: Instead of using `RABBITMQ_URL` perhaps it makes sense to define
// concrete `RABBIT_XYZ` variables similar to what we do for PostgreSQL to
// clearly separate each field, like hostname, username, password, etc.
url, err := conf.Get("RABBITMQ_URL")
if err != nil {
return nil, internal.WrapErrorf(err, internal.ErrorCodeUnknown, "conf.Get")
}
conn, err := amqp.Dial(url)
if err != nil {
return nil, internal.WrapErrorf(err, internal.ErrorCodeUnknown, "amqp.Dial")
}
channel, err := conn.Channel()
if err != nil {
return nil, internal.WrapErrorf(err, internal.ErrorCodeUnknown, "conn.Channel")
}
err = channel.ExchangeDeclare(
"tasks", // name
"topic", // type
true, // durable
false, // auto-deleted
false, // internal
false, // no-wait
nil, // arguments
)
if err != nil {
return nil, internal.WrapErrorf(err, internal.ErrorCodeUnknown, "ch.ExchangeDeclare")
}
if err := channel.Qos(
1, // prefetch count
0, // prefetch size
false, // global
); err != nil {
return nil, internal.WrapErrorf(err, internal.ErrorCodeUnknown, "ch.Qos")
}
// XXX: Dead Letter Exchange will be implemented in future episodes
return &RabbitMQ{
Connection: conn,
Channel: channel,
}, nil
}
// Close ...
func (r *RabbitMQ) Close() {
r.Connection.Close()
}