ZIO-2 logging (Part 1)

.github/workflows/ci.yml

@@ -73,7 +73,7 @@ jobs:
         run: sbt ++${{ matrix.scala }} docs/mdoc
 
       - name: Compress target directories
-        run: tar cf targets.tar modules/logging/interop/shapeless/target modules/kernel/target modules/logging/target examples/target modules/doobie/core-ce3/target modules/concurrent/target modules/logging/layout/target modules/kernelCE2Interop/target modules/doobie/core/target modules/zio/target modules/fs2-ce3/target examples-ce3/target tofu-docs/target modules/zio/logging/target modules/core3/target modules/kernel/interop/cats-mtl/target modules/config/target modules/doobie/logging-ce3/target modules/kernelCE3Interop/target modules/zio/core/target modules/streams/target modules/logging/structured/target modules/logging/interop/logstash-logback/target modules/logging/interop/log4cats/target modules/doobie/logging/target modules/enums/target target modules/fs2/target modules/logging/derivation/target modules/logging/interop/refined/target modules/higherKindCore/target modules/derivation/target modules/core/target modules/observable/target modules/memo/target modules/env/target project/target
+        run: tar cf targets.tar modules/logging/interop/shapeless/target modules/kernel/target modules/zio2/logging/target modules/logging/target examples/target modules/doobie/core-ce3/target modules/concurrent/target modules/logging/layout/target modules/kernelCE2Interop/target modules/doobie/core/target modules/zio/target modules/fs2-ce3/target examples-ce3/target tofu-docs/target modules/zio/logging/target modules/core3/target modules/kernel/interop/cats-mtl/target modules/config/target modules/doobie/logging-ce3/target modules/kernelCE3Interop/target modules/zio/core/target modules/streams/target modules/logging/structured/target modules/logging/interop/logstash-logback/target modules/logging/interop/log4cats/target modules/doobie/logging/target modules/enums/target target examples-zio2/target modules/fs2/target modules/logging/derivation/target modules/logging/interop/refined/target modules/higherKindCore/target modules/derivation/target modules/core/target modules/observable/target modules/memo/target modules/env/target project/target
 
       - name: Upload target directories
         uses: actions/upload-artifact@v2

build.sbt

@@ -260,6 +260,26 @@ lazy val zioLogging =
     )
     .dependsOn(loggingStr, loggingDer % "test", zioCore % Test)
 
+lazy val zio2Logging =
+  project
+    .in(file("modules/zio2/logging"))
+    .settings(
+      defaultSettings,
+      name := "tofu-zio2-logging",
+      libraryDependencies ++= List(zio2, slf4j, logback % Test, zio2Test, zio2TestSbt)
+    )
+    .dependsOn(loggingStr, loggingDer % "test")
+
+lazy val examplesZIO2 =
+  project
+    .in(file("examples-zio2"))
+    .settings(
+      defaultSettings,
+      name := "tofu-examples-zio2",
+      noPublishSettings
+    )
+    .dependsOn(zio2Logging, loggingDer, loggingLayout)
+
 lazy val zioInterop = project
   .in(file("modules/zio"))
   .settings(
@@ -373,7 +393,7 @@ lazy val ce3CoreModules = Vector(
 )
 
 lazy val commonModules =
-  Vector(observable, logging, enums, config, zioInterop, fs2Interop, doobie, doobieLogging)
+  Vector(observable, logging, enums, config, zioInterop, zio2Logging, fs2Interop, doobie, doobieLogging)
 
 lazy val ce3CommonModules =
   Vector(loggingStr, loggingDer, loggingLayout, doobieCE3, doobieLoggingCE3, fs2CE3Interop)
@@ -407,9 +427,8 @@ lazy val tofu = project
     name := "tofu"
   )
   .aggregate(
-    (coreModules ++ commonModules ++ ce3CoreModules ++ ce3CommonModules :+ docs :+ examples :+ examplesCE3).map(x =>
-      x: ProjectReference
-    ): _*
+    (coreModules ++ commonModules ++ ce3CoreModules ++ ce3CommonModules :+ docs :+ examples :+ examplesCE3 :+ examplesZIO2)
+      .map(x => x: ProjectReference): _*
   )
   .dependsOn(coreModules.map(x => x: ClasspathDep[ProjectReference]): _*)
 

examples-zio2/src/main/resources/logback.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<configuration scan="true" scanPeriod="10 minutes" >
+    <appender name="structured" class="ch.qos.logback.core.ConsoleAppender" packagingData="true">
+        <encoder class="ch.qos.logback.core.encoder.LayoutWrappingEncoder">
+            <charset>UTF-8</charset>
+            <layout class="tofu.logging.ELKLayout"/>
+        </encoder>
+    </appender>
+
+    <root level="DEBUG">
+        <appender-ref ref="structured"/>
+    </root>
+</configuration>

examples-zio2/src/main/scala/tofu/example/logging/ZMakeSimpleExample.scala

@@ -0,0 +1,26 @@
+package tofu.example.logging
+
+import tofu.example.logging.impl.{FooService, SimpleContext}
+import tofu.logging.zlogs.ZLogging
+import zio._
+
+object ZMakeSimpleExample extends ZIOAppDefault {
+
+  val tasks = (1 to 3)
+    .map(i =>
+      for {
+        id <- Random.nextIntBetween(1000, 4000)
+        _  <- ZIO.serviceWithZIO[SimpleContext](_.set(id.toHexString))
+        _  <- ZIO.serviceWithZIO[FooService](_.foo(i)) // each task prints its own requestId set above
+      } yield ()
+    )
+
+  override def run =
+    ZIO
+      .collectAllParDiscard(tasks)
+      .provide(
+        FooService.layer,
+        SimpleContext.layer,                 // ULayer[SimpleContext]
+        ZLogging.Make.layerPlainWithContext, // requires ContextProvider, but easily finds its implementation — SimpleContext
+      )
+}

examples-zio2/src/main/scala/tofu/example/logging/impl/FooService.scala

@@ -0,0 +1,21 @@
+package tofu.example.logging.impl
+
+import tofu.logging.zlogs.{ULogging, ZLogging}
+import zio._
+
+class FooService(
+    logs: ZLogging.Make
+) {
+  private val logger: ULogging = logs.forService[FooService]
+
+  def foo(i: Int): UIO[Int] =
+    for {
+      _ <- logger.debug("Starting Foo! i={}", i)
+      _ <- Clock.sleep(i.seconds)
+      _ <- logger.info("Foo completed!")
+    } yield i
+}
+
+object FooService {
+  val layer: URLayer[ZLogging.Make, FooService] = ZLayer.fromFunction(new FooService(_))
+}

examples-zio2/src/main/scala/tofu/example/logging/impl/SimpleContext.scala

@@ -0,0 +1,22 @@
+package tofu.example.logging.impl
+
+import tofu.logging.Loggable
+import tofu.logging.zlogs.ValueContextProvider
+import zio.{FiberRef, UIO, ULayer, ZLayer}
+
+class SimpleContext(ref: FiberRef[String])
+    extends ValueContextProvider[String]()(Loggable.stringValue.named("requestId")) {
+
+  override def getA: UIO[String] = ref.get
+
+  def set(requestId: String): UIO[Unit] =
+    ref.set(requestId)
+}
+
+object SimpleContext {
+  val layer: ULayer[SimpleContext] = ZLayer.scoped(
+    FiberRef
+      .make[String]("undefined_request_id")
+      .map(new SimpleContext(_))
+  )
+}

modules/zio2/logging/src/main/scala/tofu/logging/impl/ZContextLogging.scala

@@ -0,0 +1,34 @@
+package tofu.logging.impl
+
+import org.slf4j.{Logger, Marker}
+import tofu.logging.zlogs.ZLogging
+import tofu.logging.{Loggable, LoggedValue, Logging}
+import zio._
+
+private[logging] class ZContextLogging[R, Ctx: Loggable](logger: => Logger, ctxLog: URIO[R, Ctx]) extends ZLogging[R] {
+  override def write(level: Logging.Level, message: String, values: LoggedValue*): URIO[R, Unit] =
+    ctxLog.flatMap { ctx =>
+      ZIO.succeed(
+        ZUniversalContextLogging.write(level, logger, message, ctx, values, Nil)
+      )
+    }
+
+  override def writeMarker(level: Logging.Level, message: String, marker: Marker, values: LoggedValue*): URIO[R, Unit] =
+    ctxLog.flatMap { ctx =>
+      ZIO.succeed(
+        ZUniversalContextLogging.write(level, logger, message, ctx, values, marker :: Nil)
+      )
+    }
+
+  override def writeCause(
+      level: Logging.Level,
+      message: String,
+      cause: Throwable,
+      values: LoggedValue*
+  ): URIO[R, Unit] =
+    ctxLog.flatMap { ctx =>
+      ZIO.succeed(
+        ZUniversalContextLogging.writeCause(level, logger, cause, message, ctx, values, Nil)
+      )
+    }
+}

modules/zio2/logging/src/main/scala/tofu/logging/impl/ZUniversalContextLogging.scala

@@ -0,0 +1,50 @@
+package tofu.logging.impl
+
+import org.slf4j.{Logger, LoggerFactory, Marker}
+import tofu.logging._
+import zio.URIO
+
+class ZUniversalContextLogging[R, Ctx: Loggable](name: String, ctxLog: URIO[R, Ctx])
+    extends ZContextLogging[R, Ctx](LoggerFactory.getLogger(name), ctxLog)
+
+object ZUniversalContextLogging {
+
+  private[logging] def write(
+      level: Logging.Level,
+      logger: Logger,
+      message: => String,
+      ctx: LoggedValue,
+      values: Seq[LoggedValue],
+      markers: List[Marker] = Nil
+  ): Unit = {
+    if (UniversalLogging.enabled(level, logger))
+      UniversalLogging.writeMarker(
+        level = level,
+        logger = logger,
+        marker = ContextMarker(ctx, markers),
+        message = message,
+        values = values
+      )
+  }
+
+  private[logging] def writeCause(
+      level: Logging.Level,
+      logger: Logger,
+      cause: Throwable,
+      message: => String,
+      ctx: LoggedValue,
+      values: Seq[LoggedValue],
+      markers: List[Marker] = Nil
+  ): Unit = {
+    if (UniversalLogging.enabled(level, logger))
+      UniversalLogging.writeMarkerCause(
+        level = level,
+        logger = logger,
+        marker = ContextMarker(ctx, markers),
+        cause = cause,
+        message = message,
+        values = values
+      )
+  }
+
+}

modules/zio2/logging/src/main/scala/tofu/logging/zlogs/ContextProvider.scala

@@ -0,0 +1,14 @@
+package tofu.logging.zlogs
+
+import tofu.logging.{Loggable, LoggedValue}
+import zio.UIO
+
+trait ContextProvider {
+  def getCtx: UIO[LoggedValue]
+}
+
+abstract class ValueContextProvider[A](implicit L: Loggable[A]) extends ContextProvider {
+  protected def getA: UIO[A]
+
+  override def getCtx: UIO[LoggedValue] = getA.map(x => x)
+}

modules/zio2/logging/src/main/scala/tofu/logging/zlogs/ZLogging.scala

@@ -0,0 +1,48 @@
+package tofu.logging.zlogs
+
+import tofu.logging._
+import tofu.logging.impl.ZUniversalContextLogging
+import zio._
+
+import scala.annotation.unused
+
+object ZLogging {
+
+  type ZMake[R] = Logging.Make[URIO[R, *]]
+
+  type Make = Logging.Make[UIO]
+
+  def empty[R]: ZLogging[R] = new Logging[URIO[R, *]] {
+    override def write(level: Logging.Level, message: String, values: LoggedValue*): URIO[R, Unit] = ZIO.unit
+  }
+
+  /** Unlike [[ZLogs]] layers, these helpers are effect-less.
+    */
+  object Make {
+
+    /** Creates layer with a helper producing simple [[tofu.logging.Logging]].
+      */
+    val layerPlain: ULayer[ZLogging.Make] = ZLayer.succeed(new ZUniversalContextLogging(_, ZIO.unit))
+
+    /** Creates layer with a helper [[ZMake]] producing logging `ZLogging[R]`. Logging methods will add the context from
+      * the ZIO environment.
+      *
+      * @tparam R
+      *   the context, an environment of the logging methods.
+      */
+    def layerContextual[R: Loggable](implicit @unused RT: Tag[R]): ULayer[ZLogging.ZMake[R]] = ZLayer.succeed(
+      new ZUniversalContextLogging(_, ZIO.service[R])
+    )
+
+    /** Creates layer with a helper [[Make]] producing plain `ULogging` with encapsulated context. You have to provide
+      * an implementation of `ContextProvider`.
+      */
+    def layerPlainWithContext: URLayer[ContextProvider, ZLogging.Make] =
+      ZLayer(
+        ZIO.serviceWith[ContextProvider](cp => new ZUniversalContextLogging(_, cp.getCtx))
+      )
+
+    val layerEmpty: ULayer[ZLogging.Make] = ZLayer.succeed(_ => empty[Any])
+  }
+
+}

modules/zio2/logging/src/main/scala/tofu/logging/zlogs/package.scala

@@ -0,0 +1,10 @@
+package tofu.logging
+
+import zio.{UIO, URIO}
+
+package object zlogs {
+  type ZLogs[R]    = Logs[UIO, URIO[R, *]]
+  type ULogs       = Logs[UIO, UIO]
+  type ZLogging[R] = Logging[URIO[R, *]]
+  type ULogging    = Logging[UIO]
+}

modules/zio2/logging/src/main/scala/tofu/logging/zlogs/zlogs.scala

@@ -0,0 +1,41 @@
+package tofu.logging.zlogs
+
+import org.slf4j.{Logger, LoggerFactory}
+import tofu.logging.impl.ZContextLogging
+import tofu.logging.{Loggable, Logs}
+import zio._
+
+import scala.annotation.unused
+
+object ZLogs {
+
+  private def make[R](f: Logger => ZLogging[R]) =
+    new Logs[UIO, URIO[R, *]] {
+      override def byName(name: String): UIO[ZLogging[R]] =
+        ZIO.succeed(LoggerFactory.getLogger(name)).map(f)
+    }
+
+  /** Creates layer with a helper producing simple [[tofu.logging.Logging]].
+    */
+  def layerPlain: ULayer[ULogs] =
+    ZLayer.succeed(make(new ZContextLogging(_, ZIO.unit)))
+
+  /** Creates layer with a helper [[ZLogs]] producing logging `ZLogging[R]`. Logging methods will add the context from
+    * the ZIO environment.
+    *
+    * @tparam R
+    *   the context, an environment of the logging methods.
+    */
+  def layerContextual[R: Loggable](implicit @unused RT: Tag[R]): ULayer[ZLogs[R]] =
+    ZLayer.succeed(make(new ZContextLogging(_, ZIO.service[R])))
+
+  /** Creates layer with a helper [[ULogs]] producing plain `ULogging` with encapsulated context. You have to provide an
+    * implementation of `ContextProvider`.
+    */
+  val layerPlainWithContext: URLayer[ContextProvider, ULogs] = ZLayer(
+    ZIO.serviceWith[ContextProvider](cp => make(new ZContextLogging(_, cp.getCtx)))
+  )
+
+  val layerEmpty: ULayer[ULogs] = ZLayer.succeed(make(_ => ZLogging.empty[Any]))
+
+}

project/Dependencies.scala

@@ -46,6 +46,8 @@ object Dependencies {
 
     val zio = "1.0.17"
 
+    val zio2 = "2.0.3"
+
     val zioCats = "2.5.1.0"
 
     val shapeless = "2.3.10"
@@ -109,6 +111,9 @@ object Dependencies {
   val catsTagless      = "org.typelevel"          %% "cats-tagless-macros"      % Version.catsTagless
   val typesafeConfig   = "com.typesafe"            % "config"                   % Version.typesafeConfig
   val zio              = "dev.zio"                %% "zio"                      % Version.zio
+  val zio2             = "dev.zio"                %% "zio"                      % Version.zio2
+  val zio2Test         = "dev.zio"                %% "zio-test"                 % Version.zio2      % Test
+  val zio2TestSbt      = "dev.zio"                %% "zio-test-sbt"             % Version.zio2      % Test
   val zioCats          = "dev.zio"                %% "zio-interop-cats"         % Version.zioCats
   val scalatest        = "org.scalatest"          %% "scalatest"                % Version.scalatest % Test
   val shapeless        = "com.chuusai"            %% "shapeless"                % Version.shapeless