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consumer.go
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consumer.go
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package rmqworker
import (
"context"
"errors"
"fmt"
"github.com/google/uuid"
"github.com/matrixbotio/constants-lib"
darkmq "github.com/sagleft/darkrmq"
"github.com/streadway/amqp"
)
type consumer struct {
Tag string
ManualAck bool
QueueData DeclareQueueTask
Binding exchandeBindData
msgHandler func(delivery RMQDeliveryHandler)
errorCallback func(err *constants.APIError)
}
func (c *consumer) declareQueue(ch *amqp.Channel, task DeclareQueueTask) error {
args := amqp.Table{}
if task.MessagesLifetime > 0 {
args["x-message-ttl"] = task.MessagesLifetime
}
if task.MaxLength > 0 {
args["x-max-length"] = task.MaxLength
}
if task.DisableOverflow {
args["x-overflow"] = "reject-publish"
}
_, err := ch.QueueDeclare(
task.Name, // name
task.Durable, // durable
task.AutoDelete, // delete when unused
false, // exclusive
false, // no-wait
args, // arguments
)
if err != nil {
errInfo := "failed to declare queue: " + err.Error()
c.errorCallback(constants.Error(
"SERVICE_REQ_FAILED",
errInfo,
))
return errors.New(errInfo)
}
return nil
}
func (c *consumer) declareExchange(ch *amqp.Channel) error {
err := ch.ExchangeDeclare(
c.Binding.ExchangeName, // name
ternary(c.Binding.ExchangeType == "", ExchangeTypeDirect, c.Binding.ExchangeType), // type
true, // durable
false, // auto-deleted
false, // internal
false, // no-wait
nil, // arguments
)
if err != nil {
errInfo := "failed to declare exchange: " + err.Error()
c.errorCallback(constants.Error(
"SERVICE_REQ_FAILED",
errInfo,
))
return errors.New(errInfo)
}
return nil
}
func (c *consumer) bindQueue(ch *amqp.Channel) error {
err := ch.QueueBind(
c.QueueData.Name, // queue name
c.Binding.RoutingKey, // routing key
c.Binding.ExchangeName, // exchange
false, // no-wait
nil, // arguments
)
if err != nil {
errInfo := "failed to bind queue `" + c.QueueData.Name + "` to `" + c.Binding.ExchangeName + "`: " + err.Error()
c.errorCallback(constants.Error(
"SERVICE_REQ_FAILED",
errInfo,
))
return errors.New(errInfo)
}
return nil
}
// Declare implement darkmq.Consumer.(Declare) interface method
func (c *consumer) Declare(ctx context.Context, ch *amqp.Channel) error {
err := c.declareQueue(ch, c.QueueData)
if err != nil {
return err
}
if c.Binding.ExchangeName != "" {
err = c.declareExchange(ch)
if err != nil {
return err
}
err = c.bindQueue(ch)
if err != nil {
return err
}
}
return nil
}
// Consume implement darkmq.Consumer.(Consume) interface method
// NOTE: it's blocking method
func (c *consumer) Consume(task darkmq.ConsumeTask) error {
err := task.Ch.Qos(
1, // prefetch count
0, // prefetch size
false, // global
)
if err != nil {
errInfo := "failed to set QOS: " + err.Error()
c.errorCallback(constants.Error(
"SERVICE_REQ_FAILED",
errInfo,
))
return errors.New(errInfo)
}
// set consumer tag
if task.UniqueTag == "" {
task.UniqueTag = uuid.NewString()
}
msgs, err := task.Ch.Consume(
c.QueueData.Name, // queue
task.UniqueTag, // consumer name
false, // auto-ack
false, // exclusive
false, // no-local
false, // no-wait
nil, // args
)
if err != nil {
errInfo := "failed to consume from `" + c.QueueData.Name + "`: " + err.Error()
c.errorCallback(constants.Error(
"SERVICE_REQ_FAILED",
errInfo,
))
return errors.New(errInfo)
}
// notify consumer ready
task.ReadyCh <- struct{}{}
for {
select {
case delivery, chOpened := <-msgs:
if err := c.handleDelivery(delivery, chOpened); err != nil {
c.ErrorCallback(err)
}
case <-task.Ctx.Done():
return task.Ctx.Err()
}
}
}
// GetTag - get consumer tag
func (c *consumer) GetTag() string {
return c.Tag
}
func (c *consumer) ErrorCallback(err error) {
c.errorCallback(constants.Error(
"SERVICE_REQ_FAILED",
err.Error(),
))
}
func (c *consumer) handleDelivery(delivery amqp.Delivery, chOpened bool) error {
if !chOpened {
return fmt.Errorf("handle delivery: %w", amqp.ErrClosed)
}
deliveryHandler := NewRMQDeliveryHandler(delivery)
if !c.ManualAck {
if err := deliveryHandler.Accept(); err != nil {
return fmt.Errorf("handle delivery accept message: %s", err.Message)
}
}
c.msgHandler(deliveryHandler)
return nil
}