From ffe16f8c744048e764e070751d54cea7b3377285 Mon Sep 17 00:00:00 2001
From: Fabian Seidl <fabian.seidl@h-da.de>
Date: Tue, 18 Feb 2025 09:11:50 +0000
Subject: [PATCH] multiple consumers possible
---
application-framework/event/eventService.go | 27 +++++++++++++++++++--
controller/eventService/Service.go | 23 +++++++++---------
2 files changed, 37 insertions(+), 13 deletions(-)
diff --git a/application-framework/event/eventService.go b/application-framework/event/eventService.go
index 9edf6b709..f51bb086e 100644
--- a/application-framework/event/eventService.go
+++ b/application-framework/event/eventService.go
@@ -77,15 +77,38 @@ func (e *Service) SetupEventReciever(stopChan chan os.Signal) {
// setupQueueConsume sets up a connection to the broker, listens to messages on a specific topic
// and writes them into a channel.
func (e *Service) setupQueueConsume(topic string, stopChan chan os.Signal) error {
+ err := e.channel.ExchangeDeclare(
+ topic, // name
+ "fanout", // type
+ true, // durable
+ false, // auto-deleted
+ false, // internal
+ false, // no-wait
+ nil, // arguments
+ )
+ if err != nil {
+ return &customerrs.AMQPMessageFailError{Action: "failed declaring queue", Err: err}
+ }
+
q, err := e.channel.QueueDeclare(
- topic, // name
+ "", // name
false, // durable
false, // delete when unused
- false, // exclusive
+ true, // exclusive
false, // no-wait
nil, // arguments
)
+ if err != nil {
+ return &customerrs.AMQPMessageFailError{Action: "failed declaring queue", Err: err}
+ }
+ err = e.channel.QueueBind(
+ q.Name, // queue name
+ "", // routing key
+ topic, // exchange
+ false,
+ nil,
+ )
if err != nil {
return &customerrs.AMQPMessageFailError{Action: "failed declaring queue", Err: err}
}
diff --git a/controller/eventService/Service.go b/controller/eventService/Service.go
index 330cb195b..e3429d78a 100644
--- a/controller/eventService/Service.go
+++ b/controller/eventService/Service.go
@@ -170,13 +170,14 @@ func initChannel(conn *amqp.Connection) (*amqp.Channel, error) {
// PublishEvent declares a queue and publishes events.
func (e *EventService) PublishEvent(topic string, event event.Event) error {
- q, err := e.channel.QueueDeclare(
- topic, // name
- false, // durable
- false, // delete when unused
- false, // exclusive
- false, // no-wait
- nil, // arguments
+ err := e.channel.ExchangeDeclare(
+ topic, // name
+ "fanout", // type
+ true, // durable
+ false, // auto-deleted
+ false, // internal
+ false, // no-wait
+ nil, // arguments
)
if err != nil {
return &customerrs.AMQPInitFailError{Action: "failed declaring queue", Err: err}
@@ -189,10 +190,10 @@ func (e *EventService) PublishEvent(topic string, event event.Event) error {
err = e.channel.PublishWithContext(
context.TODO(),
- "", // exchange
- q.Name, // routing key
- false, // mandatory
- false, // immediate
+ topic, // exchange
+ "", // routing key
+ false, // mandatory
+ false, // immediate
amqp.Publishing{
ContentType: "application/json",
Body: eventBody,
--
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