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package xyz.driver.core.messaging
import java.nio.ByteBuffer
import java.util
import com.aliyun.mns.client.{AsyncCallback, CloudAccount}
import com.aliyun.mns.common.ServiceException
import com.aliyun.mns.model
import com.aliyun.mns.model._
import scala.concurrent.duration._
import scala.concurrent.{ExecutionContext, Future, Promise}
class AliyunBus(
accountId: String,
accessId: String,
accessSecret: String,
region: String,
namespace: String,
pullTimeout: Int
)(implicit val executionContext: ExecutionContext)
extends Bus {
private val endpoint = s"https://$accountId.mns.$region.aliyuncs.com"
private val cloudAccount = new CloudAccount(accessId, accessSecret, endpoint)
private val client = cloudAccount.getMNSClient
// When calling the asyncBatchPopMessage endpoint, alicloud returns an error if no message is received before the
// pullTimeout. This error is documented as MessageNotExist, however it's been observed to return InternalServerError
// occasionally. We mask both of these errors and return an empty list of messages
private val MaskedErrorCodes: Set[String] = Set("MessageNotExist", "InternalServerError")
override val defaultMaxMessages: Int = 10
case class MessageId(queueName: String, messageHandle: String)
case class Message[A](id: MessageId, data: A) extends BasicMessage[A]
case class SubscriptionConfig(
subscriptionPrefix: String = accessId,
ackTimeout: FiniteDuration = 10.seconds
)
override val defaultSubscriptionConfig: SubscriptionConfig = SubscriptionConfig()
private def rawTopicName(topic: Topic[_]) =
s"$namespace-${topic.name}"
private def rawSubscriptionName(config: SubscriptionConfig, topic: Topic[_]) =
s"$namespace-${config.subscriptionPrefix}-${topic.name}"
override def fetchMessages[A](
topic: Topic[A],
config: SubscriptionConfig,
maxMessages: Int): Future[Seq[Message[A]]] = {
import collection.JavaConverters._
val subscriptionName = rawSubscriptionName(config, topic)
val queueRef = client.getQueueRef(subscriptionName)
val promise = Promise[Seq[model.Message]]
queueRef.asyncBatchPopMessage(
maxMessages,
pullTimeout,
new AsyncCallback[util.List[model.Message]] {
override def onSuccess(result: util.List[model.Message]): Unit = {
promise.success(result.asScala)
}
override def onFail(ex: Exception): Unit = ex match {
case serviceException: ServiceException if MaskedErrorCodes(serviceException.getErrorCode) =>
promise.success(Nil)
case _ =>
promise.failure(ex)
}
}
)
promise.future.map(_.map { message =>
import scala.xml.XML
val messageId = MessageId(subscriptionName, message.getReceiptHandle)
val messageXML = XML.loadString(message.getMessageBodyAsRawString)
val messageNode = messageXML \ "Message"
val messageBytes = java.util.Base64.getDecoder.decode(messageNode.head.text)
val deserializedMessage = topic.deserialize(ByteBuffer.wrap(messageBytes))
Message(messageId, deserializedMessage)
})
}
override def acknowledgeMessages(messages: Seq[MessageId]): Future[Unit] = {
import collection.JavaConverters._
require(messages.nonEmpty, "Acknowledged message list must be non-empty")
val queueRef = client.getQueueRef(messages.head.queueName)
val promise = Promise[Unit]
queueRef.asyncBatchDeleteMessage(
messages.map(_.messageHandle).asJava,
new AsyncCallback[Void] {
override def onSuccess(result: Void): Unit = promise.success(())
override def onFail(ex: Exception): Unit = promise.failure(ex)
}
)
promise.future
}
override def publishMessages[A](topic: Topic[A], messages: Seq[A]): Future[Unit] = {
val topicRef = client.getTopicRef(rawTopicName(topic))
val publishMessages = messages.map { message =>
val promise = Promise[TopicMessage]
val topicMessage = new Base64TopicMessage
topicMessage.setMessageBody(topic.serialize(message).array())
topicRef.asyncPublishMessage(
topicMessage,
new AsyncCallback[TopicMessage] {
override def onSuccess(result: TopicMessage): Unit = promise.success(result)
override def onFail(ex: Exception): Unit = promise.failure(ex)
}
)
promise.future
}
Future.sequence(publishMessages).map(_ => ())
}
def createTopic(topic: Topic[_]): Future[Unit] = Future {
val topicName = rawTopicName(topic)
val topicExists = Option(client.listTopic(topicName, "", 1)).exists(!_.getResult.isEmpty)
if (!topicExists) {
val topicMeta = new TopicMeta
topicMeta.setTopicName(topicName)
client.createTopic(topicMeta)
}
}
def createSubscription(topic: Topic[_], config: SubscriptionConfig): Future[Unit] = Future {
val subscriptionName = rawSubscriptionName(config, topic)
val queueExists = Option(client.listQueue(subscriptionName, "", 1)).exists(!_.getResult.isEmpty)
if (!queueExists) {
val topicName = rawTopicName(topic)
val topicRef = client.getTopicRef(topicName)
val queueMeta = new QueueMeta
queueMeta.setQueueName(subscriptionName)
queueMeta.setVisibilityTimeout(config.ackTimeout.toSeconds)
client.createQueue(queueMeta)
val subscriptionMeta = new SubscriptionMeta
subscriptionMeta.setSubscriptionName(subscriptionName)
subscriptionMeta.setTopicName(topicName)
subscriptionMeta.setEndpoint(topicRef.generateQueueEndpoint(subscriptionName))
topicRef.subscribe(subscriptionMeta)
}
}
}
|
