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liewhite.rpc.RpcClient.scala Maven / Gradle / Ivy
package liewhite.rpc
import scala.util.Try
import scala.jdk.CollectionConverters.*
import zio.*
import zio.stream.*
import zio.concurrent.*
import java.util.concurrent.ConcurrentHashMap
import com.rabbitmq.client.*
import com.rabbitmq.client.AMQP.Confirm
import com.rabbitmq.client.AMQP.Basic.Deliver
import com.rabbitmq.utility.BlockingCell
import liewhite.json.{given, *}
import liewhite.rpc.Transport
import java.util.UUID
import liewhite.rpc
import liewhite.rpc.RpcResponse
// rpc 内部错误
class RpcException(val msg: String) extends Exception(msg)
class NoRouteException(val route: String) extends RpcException(s"no route ${route}")
class NackException(val tag: String) extends RpcException(s"nack ${tag}")
class TimeoutException(val route: String) extends RpcException(s"timeout ${route}")
enum MessageReceipt(tag: Long, multiple: Boolean) {
case Ack(tag: Long, multiple: Boolean) extends MessageReceipt(tag, multiple)
case Nack(tag: Long, multiple: Boolean) extends MessageReceipt(tag, multiple)
case NoRoute(tag: Long, route: String) extends MessageReceipt(tag, false)
case Response(delivery: Delivery)
extends MessageReceipt(
Try(
delivery
.getProperties()
.getHeaders()
.get("deliveryTag")
.asInstanceOf[Long]
).getOrElse(0),
false
)
def getTag = tag
def getMultiple = multiple
}
class RpcClient(transport: Transport, publishLock: ReentrantLock) {
val channel = transport.newChannel()
val replyTo = UUID.randomUUID().toString()
// deliveryTag, route, promise
val requests =
new ConcurrentHashMap[Long, (String, Promise[RpcException, Delivery])]
def close() =
Try(channel.close())
// 启动 confirmListener， returnListener， consumer
def start(): ZIO[Any, Throwable, Fiber.Runtime[Throwable, Long]] = {
(for {
replyQueue <- ZIO.attemptBlocking(
channel.queueDeclare(replyTo, true, true, true, new java.util.HashMap[String, Object]).getQueue()
)
_ <- ZIO.attemptBlocking {
channel.queueBind(replyQueue, "amq.direct", replyQueue)
}
confirmPromise <- Promise.make[Nothing, Unit]
returnPromise <- Promise.make[Nothing, Unit]
consumePromise <- Promise.make[Nothing, Unit]
confirmStream =
ZStream.asyncScoped[Any, Nothing, MessageReceipt] { cb =>
val listener = channel.addConfirmListener(
(a, b) => {
cb(
ZIO.succeed(Chunk(MessageReceipt.Ack(a, b)))
)
},
(a, b) => {
cb(
ZIO.succeed(
Chunk(MessageReceipt.Nack(a, b))
)
)
}
)
ZIO.acquireRelease(
ZIO.logInfo("[rpc-client] add confirm listener") *>
confirmPromise.succeed(()) *>
ZIO.succeed(listener)
)(ln =>
ZIO.logInfo("[rpc-client] remove confirm listener") *>
ZIO.succeed(Try(channel.removeConfirmListener(ln)))
)
}
returnStream = ZStream.asyncScoped[Any, Nothing, MessageReceipt] { cb =>
val listener = channel.addReturnListener { msg =>
val tag = msg
.getProperties()
.getHeaders()
.get("deliveryTag")
.asInstanceOf[Long]
cb(
ZIO.succeed(
Chunk(MessageReceipt.NoRoute(tag, requests.get(tag)._1))
)
)
}
ZIO.acquireRelease(
ZIO.logInfo("[rpc-client] add return listener") *> returnPromise
.succeed(
()
) *> ZIO.succeed(listener)
)(ln =>
ZIO.logInfo("[rpc-client] remove return listener") *>
ZIO
.succeed(Try(channel.removeReturnListener(ln)))
)
}
consumeStream =
ZStream.asyncScoped[Any, Nothing, MessageReceipt] { cb =>
val consumer = channel.basicConsume(
replyQueue,
true,
new DefaultConsumer(channel) {
override def handleDelivery(
consumerTag: String,
envelope: Envelope,
properties: AMQP.BasicProperties,
body: Array[Byte]
): Unit =
cb(
ZIO.succeed(
Chunk(
MessageReceipt.Response(
Delivery(envelope, properties, body)
)
)
)
)
}
)
ZIO.acquireRelease(
ZIO.logInfo("[rpc-client] add consumer") *> consumePromise.succeed(
()
) *> ZIO.succeed(consumer)
)(ln =>
ZIO.logInfo("[rpc-client] remove consumer") *> ZIO.succeed(
Try(
channel.basicCancel(consumer)
)
)
)
}
receipts = confirmStream.merge(returnStream).merge(consumeStream)
f <- receipts
.runFoldZIO(0L) { (lastTag, r) =>
val tag = r.getTag
val tags = if (r.getMultiple) {
// 左开右闭
((lastTag + 1) to tag).filter(i => requests.contains(i))
} else {
Seq(tag)
}
val nextTag = if (r.getMultiple) {
tag + 1
} else {
Seq(lastTag + 1, tag).min
}
ZIO.attempt {
ZIO.foreach(tags) { t =>
val req = requests.get(t)
if (req == null) {
// response 可能在ack前到达
ZIO.unit
} else {
r match
case e: MessageReceipt.Nack =>
ZIO.logWarning(s"message nacked: ${e.tag}") *>
req._2.fail(NackException(e.tag.toString()))
case e: MessageReceipt.NoRoute =>
ZIO.logWarning(s"message no route: ${e.route}") *>
req._2.fail(NoRouteException(e.route))
case v: MessageReceipt.Ack => ZIO.unit
case MessageReceipt.Response(delivery) =>
for {
tag <- ZIO.attempt(
delivery
.getProperties()
.getHeaders()
.get("deliveryTag")
.asInstanceOf[Long]
)
_ <- req._2.succeed(delivery)
} yield ()
}
}
}.flatten
.catchAllCause(e => ZIO.logError(s"failed process receipt: $e") *> ZIO.unit)
.as(nextTag)
}
.fork
_ <- confirmPromise.await
_ <- returnPromise.await
_ <- consumePromise.await
} yield f)
}
def waitForResponse(tag: Long): Task[Delivery] =
ZIO.attempt(requests.get(tag)._2).flatMap(_.await)
def nextTag: ZIO[Any, Nothing, Long] =
ZIO.succeed(channel.getNextPublishSeqNo())
def call(
route: String,
message: String,
mandatory: Boolean = true,
props: AMQP.BasicProperties = AMQP.BasicProperties(),
timeout: Duration = 30.second
): ZIO[Any, Throwable, RpcResponse] = {
val lockedScope =
ZIO.scoped(
for {
_ <- publishLock.withLock
tag <- nextTag
newProps = props
.builder()
.headers(Map("deliveryTag" -> tag).asJava)
.replyTo(replyTo)
.build()
promise <- Promise.make[RpcException, Delivery]
_ <- (ZIO.succeed {
requests.put(tag, (route, promise))
})
_ <- ZIO.attemptBlocking {
channel
.basicPublish("amq.topic", route, mandatory, newProps, message.getBytes())
}
} yield tag
)
// 等待response可以在scope外
ZIO.scoped {
for {
tag <- lockedScope
cleanTask <- ZIO.acquireRelease(ZIO.succeed(tag))(t => ZIO.succeed(requests.remove(t)))
response <- waitForResponse(tag)
.timeoutFail(TimeoutException(route))(timeout)
parsedBody <- ZIO
.fromEither(String(response.getBody()).fromJson[RpcResponse])
.mapError(err => RpcException("protocol err: " + err.toString()))
} yield parsedBody
}
}
def send(
route: String,
message: Array[Byte],
mandatory: Boolean = false,
props: AMQP.BasicProperties = AMQP.BasicProperties()
): Task[Unit] = {
val lockedScope: ZIO[Any, Throwable, Unit] =
ZIO.scoped(
for {
_ <- publishLock.withLock
tag <- nextTag
_ <- ZIO.attemptBlocking {
channel
.basicPublish("amq.topic", route, mandatory, props, message)
}
} yield ()
)
lockedScope
}
}
object RpcClient {
def layer: ZLayer[Transport & Scope, Throwable, liewhite.rpc.RpcClient] =
ZLayer(for {
lock <- ReentrantLock.make()
tp <- ZIO.service[Transport]
cli <- ZIO.acquireRelease(ZIO.succeed(RpcClient(tp, lock)))(client =>
ZIO.succeed(client.close()).debug("client exit: ")
)
_ <- cli.start()
} yield cli)
}
