misc: fix stream ingest + update dependencies.

 - see 48e08db
   and 51d3496

 - update various dependencies.

build.sbt

@@ -2,7 +2,7 @@ import Dependencies._
 
 inThisBuild(
   List(
-    scalaVersion := "2.13.5",
+    scalaVersion := "2.13.6",
     organization := "org.lyranthe.fs2-grpc",
     git.useGitDescribe := true,
     scmInfo := Some(ScmInfo(url("https://github.com/fiadliel/fs2-grpc"), "git@github.com:fiadliel/fs2-grpc.git"))
@@ -37,15 +37,15 @@ lazy val root = project
 lazy val `java-gen` = project
   .enablePlugins(GitVersioning)
   .settings(
-    scalaVersion := "2.12.13",
+    scalaVersion := "2.12.15",
     publishTo := sonatypePublishToBundle.value,
     libraryDependencies += scalaPbCompiler
   )
 
 lazy val `sbt-java-gen` = project
   .enablePlugins(GitVersioning, BuildInfoPlugin)
   .settings(
-    scalaVersion := "2.12.13",
+    scalaVersion := "2.12.15",
     publishTo := sonatypePublishToBundle.value,
     sbtPlugin := true,
     buildInfoPackage := "org.lyranthe.fs2_grpc.buildinfo",
@@ -65,8 +65,8 @@ lazy val `sbt-java-gen` = project
 lazy val `java-runtime` = project
   .enablePlugins(GitVersioning)
   .settings(
-    scalaVersion := "2.13.5",
-    crossScalaVersions := List(scalaVersion.value, "2.12.13"),
+    scalaVersion := "2.13.6",
+    crossScalaVersions := List(scalaVersion.value, "2.12.15"),
     publishTo := sonatypePublishToBundle.value,
     libraryDependencies ++= List(fs2, catsEffect, grpcApi) ++ List(grpcNetty, catsEffectLaws, minitest).map(_ % Test),
     mimaPreviousArtifacts := Set(organization.value %% name.value % "0.3.0"),

java-runtime/src/main/scala/client/Fs2ClientCall.scala

@@ -67,7 +67,7 @@ class Fs2ClientCall[F[_], Request, Response] private[client] (
 
   def unaryToStreamingCall(message: Request, headers: Metadata)(implicit F: ConcurrentEffect[F]): Stream[F, Response] =
     Stream
-      .bracketCase(startListener(Fs2StreamClientCallListener[F, Response](request, prefetchN), headers))(
+      .bracketCase(startListener(Fs2StreamClientCallListener[F, Response](request, prefetchN), headers) <* request(1))(
         handleExitCase(cancelComplete = true)
       )
       .flatMap(Stream.eval_(sendSingleMessage(message)) ++ _.stream.adaptError(ea))
@@ -76,7 +76,7 @@ class Fs2ClientCall[F[_], Request, Response] private[client] (
       F: ConcurrentEffect[F]
   ): Stream[F, Response] =
     Stream
-      .bracketCase(startListener(Fs2StreamClientCallListener[F, Response](request, prefetchN), headers))(
+      .bracketCase(startListener(Fs2StreamClientCallListener[F, Response](request, prefetchN), headers) <* request(1))(
         handleExitCase(cancelComplete = true)
       )
       .flatMap(_.stream.adaptError(ea).concurrently(sendStream(messages)))

java-runtime/src/main/scala/client/StreamIngest.scala

@@ -4,7 +4,6 @@ package client
 
 import cats.syntax.all._
 import cats.effect._
-import cats.effect.concurrent.Ref
 import fs2.Stream
 import fs2.concurrent.InspectableQueue
 
@@ -20,40 +19,33 @@ private[client] object StreamIngest {
       request: Int => F[Unit],
       prefetchN: Int
   ): F[StreamIngest[F, T]] =
-    (Ref.of[F, Int](prefetchN), InspectableQueue.unbounded[F, Either[GrpcStatus, T]])
-      .mapN((d, q) => create[F, T](request, prefetchN, d, q)) <* request(prefetchN)
+    InspectableQueue
+      .unbounded[F, Either[GrpcStatus, T]]
+      .map(q => create[F, T](request, prefetchN, q))
 
   def create[F[_], T](
       request: Int => F[Unit],
       prefetchN: Int,
-      demand: Ref[F, Int],
       queue: InspectableQueue[F, Either[GrpcStatus, T]]
   )(implicit F: ConcurrentEffect[F]): StreamIngest[F, T] = new StreamIngest[F, T] {
 
+    val limit: Int =
+      math.max(1, prefetchN)
+
+    val ensureMessages: F[Unit] =
+      queue.getSize.flatMap(qs => request(1).whenA(qs < limit))
+
     def onMessage(msg: T): F[Unit] =
-      decreaseDemandBy(1) *> queue.enqueue1(msg.asRight)
+      queue.enqueue1(msg.asRight) *> ensureMessages
 
     def onClose(status: GrpcStatus): F[Unit] =
       queue.enqueue1(status.asLeft)
 
-    def ensureMessages(nextWhenEmpty: Int): F[Unit] = (demand.get, queue.getSize)
-      .mapN((cd, qs) => fetch(nextWhenEmpty).whenA((cd + qs) < 1))
-      .flatten
-
-    def decreaseDemandBy(n: Int): F[Unit] =
-      demand.update(d => math.max(d - n, 0))
-
-    def increaseDemandBy(n: Int): F[Unit] =
-      demand.update(_ + n)
-
-    def fetch(n: Int): F[Unit] =
-      request(n) *> increaseDemandBy(n)
-
     val messages: Stream[F, T] = {
 
       val run: F[Option[T]] =
         queue.dequeue1.flatMap {
-          case Right(v) => v.some.pure[F] <* ensureMessages(prefetchN)
+          case Right(v) => ensureMessages *> v.some.pure[F]
           case Left(GrpcStatus(status, trailers)) =>
             if (!status.isOk) F.raiseError(status.asRuntimeException(trailers))
             else none[T].pure[F]

java-runtime/src/main/scala/server/Fs2StreamServerCallListener.scala

@@ -15,7 +15,7 @@ class Fs2StreamServerCallListener[F[_], Request, Response] private (
     val call: Fs2ServerCall[F, Request, Response]
 )(implicit F: Effect[F])
     extends ServerCall.Listener[Request]
-    with Fs2ServerCallListener[F, Stream[F, ?], Request, Response] {
+    with Fs2ServerCallListener[F, Stream[F, *], Request, Response] {
 
   override def onCancel(): Unit = {
     isCancelled.complete(()).unsafeRun()

java-runtime/src/test/scala/client/ClientSuite.scala

@@ -187,7 +187,7 @@ object ClientSuite extends SimpleTestSuite {
     ec.tick()
     assertEquals(result.value, Some(Success(List(1, 2, 3))))
     assertEquals(dummy.messagesSent.size, 1)
-    assertEquals(dummy.requested, 2)
+    assertEquals(dummy.requested, 3)
   }
 
   test("single message to unaryToStreaming - back pressure") {
@@ -214,7 +214,7 @@ object ClientSuite extends SimpleTestSuite {
 
     assertEquals(result.value, Some(Success(List(1, 2))))
     assertEquals(dummy.messagesSent.size, 1)
-    assertEquals(dummy.requested, 1)
+    assertEquals(dummy.requested, 2)
   }
 
   test("stream to streamingToStreaming") {

java-runtime/src/test/scala/client/StreamIngestSuite.scala

@@ -28,10 +28,11 @@ object StreamIngestSuite extends SimpleTestSuite {
     }
 
     val test =
-      run(prefetchN = 1, takeN = 1, expectedReq = 2 /* queue becomes empty */, expectedCount = 1) *>
+      run(prefetchN = 1, takeN = 1, expectedReq = 1, expectedCount = 1) *>
         run(prefetchN = 2, takeN = 1, expectedReq = 2, expectedCount = 1) *>
-        run(prefetchN = 1024, takeN = 1024, expectedReq = 2048 /* queue becomes empty */, expectedCount = 1024) *>
-        run(prefetchN = 1024, takeN = 1023, expectedReq = 1024, expectedCount = 1023)
+        run(prefetchN = 2, takeN = 2, expectedReq = 3, expectedCount = 2) *>
+        run(prefetchN = 1024, takeN = 1024, expectedReq = 2047, expectedCount = 1024) *>
+        run(prefetchN = 1024, takeN = 1023, expectedReq = 2046, expectedCount = 1023)
 
     test.unsafeRunSync()
 

project/Dependencies.scala

@@ -6,12 +6,12 @@ object Dependencies {
 
     val grpc = scalapb.compiler.Version.grpcJavaVersion
     val scalaPb = scalapb.compiler.Version.scalapbVersion
-    val fs2 = "2.5.5"
-    val catsEffect = "2.5.0"
-    val minitest = "2.9.5"
+    val fs2 = "2.5.10"
+    val catsEffect = "2.5.4"
+    val minitest = "2.9.6"
 
-    val kindProjector = "0.10.3"
-    val sbtProtoc = "1.0.3"
+    val kindProjector = "0.13.2"
+    val sbtProtoc = "1.0.4"
 
   }
 
@@ -31,6 +31,6 @@ object Dependencies {
 
   val sbtProtoc = "com.thesamet" % "sbt-protoc" % versions.sbtProtoc
   val scalaPbCompiler = "com.thesamet.scalapb" %% "compilerplugin" % versions.scalaPb
-  val kindProjector = "org.typelevel" %% "kind-projector" % versions.kindProjector cross CrossVersion.binary
+  val kindProjector = "org.typelevel" %% "kind-projector" % versions.kindProjector cross CrossVersion.full
 
 }

project/build.properties

@@ -1 +1 @@
-sbt.version=1.5.0
+sbt.version=1.5.5

project/plugins.sbt

@@ -4,10 +4,10 @@ addSbtPlugin("com.typesafe.sbt" % "sbt-git" % "1.0.0")
 
 addSbtPlugin("com.eed3si9n" % "sbt-buildinfo" % "0.10.0")
 addSbtPlugin("org.scalameta" % "sbt-scalafmt" % "2.4.2")
-addSbtPlugin("com.timushev.sbt" % "sbt-updates" % "0.5.1")
+addSbtPlugin("com.timushev.sbt" % "sbt-updates" % "0.6.0")
 
 addSbtPlugin("com.typesafe" % "sbt-mima-plugin" % "0.8.1")
 
-addSbtPlugin("io.github.davidgregory084" % "sbt-tpolecat" % "0.1.16")
+addSbtPlugin("io.github.davidgregory084" % "sbt-tpolecat" % "0.1.20")
 
-libraryDependencies += "com.thesamet.scalapb" %% "compilerplugin" % "0.11.2"
+libraryDependencies += "com.thesamet.scalapb" %% "compilerplugin" % "0.11.6"