Refactoring of Notification system

src/main/kotlin/fr/dcproject/common/email/Mailer.kt

@@ -9,6 +9,9 @@ import java.io.IOException
 class Mailer(
     private val key: String
 ) {
+    /**
+     * Send email via Sendgrid
+     */
     fun sendEmail(action: () -> Mail): Boolean {
         val mail = action()
 

src/main/kotlin/fr/dcproject/common/utils/Ktor.kt

@@ -0,0 +1,10 @@
+package fr.dcproject.common.utils
+
+import io.ktor.application.Application
+import io.ktor.application.ApplicationStopped
+
+fun Application.onApplicationStopped(callback: Application.() -> Unit) {
+    environment.monitor.subscribe(ApplicationStopped) {
+        callback()
+    }
+}

src/main/kotlin/fr/dcproject/common/utils/RabbitConsume.kt

@@ -0,0 +1,30 @@
+package fr.dcproject.common.utils
+
+import com.rabbitmq.client.AMQP
+import com.rabbitmq.client.Channel
+import com.rabbitmq.client.Consumer
+import com.rabbitmq.client.DefaultConsumer
+import com.rabbitmq.client.Envelope
+import kotlinx.coroutines.runBlocking
+import java.io.IOException
+
+fun Channel.consumeQueue(queueName: String, callback: DefaultConsumer.(ByteArray) -> Unit) {
+    val consumer: Consumer = object : DefaultConsumer(this) {
+        @Throws(IOException::class)
+        override fun handleDelivery(
+            consumerTag: String,
+            envelope: Envelope,
+            properties: AMQP.BasicProperties,
+            body: ByteArray
+        ) = runBlocking {
+            try {
+                callback(body)
+                basicAck(envelope.deliveryTag, false)
+            } catch (e: Throwable) {
+                basicNack(envelope.deliveryTag, false, true)
+            }
+        }
+    }
+    /* Launch Consumer */
+    basicConsume(queueName, false, consumer)
+}