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/*
* Copyright 2018-2024 John A. De Goes and the ZIO Contributors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package zio.stream
import zio._
import zio.metrics.MetricLabel
import zio.stream.internal.CharacterSet._
import zio.stacktracer.TracingImplicits.disableAutoTrace
import java.nio.charset.{Charset, StandardCharsets}
import java.util.concurrent.atomic.AtomicReference
import scala.annotation.tailrec
import scala.reflect.ClassTag
final class ZSink[-R, +E, -In, +L, +Z] private (val channel: ZChannel[R, ZNothing, Chunk[In], Any, E, Chunk[L], Z])
extends AnyVal {
self =>
/**
* Operator alias for [[race]].
*/
def |[R1 <: R, E1 >: E, In1 <: In, L1 >: L, Z1 >: Z](
that: => ZSink[R1, E1, In1, L1, Z1]
)(implicit trace: Trace): ZSink[R1, E1, In1, L1, Z1] =
race(that)
/**
* Operator alias for [[zip]].
*/
def <*>[R1 <: R, E1 >: E, A0, In1 <: In, L1 >: L <: In1, Z1](
that: => ZSink[R1, E1, In1, L1, Z1]
)(implicit
zippable: Zippable[Z, Z1],
ev: L <:< In1,
trace: Trace
): ZSink[R1, E1, In1, L1, zippable.Out] =
zip(that)
/**
* Operator alias for [[zipPar]].
*/
def <&>[R1 <: R, E1 >: E, A0, In1 <: In, L1 >: L <: In1, Z1](
that: => ZSink[R1, E1, In1, L1, Z1]
)(implicit zippable: Zippable[Z, Z1], trace: Trace): ZSink[R1, E1, In1, L1, zippable.Out] =
zipPar(that)
/**
* Operator alias for [[zipRight]].
*/
def *>[R1 <: R, E1 >: E, A0, In1 <: In, L1 >: L <: In1, Z1](
that: => ZSink[R1, E1, In1, L1, Z1]
)(implicit ev: L <:< In1, trace: Trace): ZSink[R1, E1, In1, L1, Z1] =
zipRight(that)
/**
* Operator alias for [[zipParRight]].
*/
def &>[R1 <: R, E1 >: E, A0, In1 <: In, L1 >: L <: In1, Z1](
that: => ZSink[R1, E1, In1, L1, Z1]
)(implicit ev: L <:< In1, trace: Trace): ZSink[R1, E1, In1, L1, Z1] =
zipParRight(that)
/**
* Operator alias for [[zipLeft]].
*/
def <*[R1 <: R, E1 >: E, A0, In1 <: In, L1 >: L <: In1, Z1](
that: => ZSink[R1, E1, In1, L1, Z1]
)(implicit ev: L <:< In1, trace: Trace): ZSink[R1, E1, In1, L1, Z] =
zipLeft(that)
/**
* Operator alias for [[zipParLeft]].
*/
def <&[R1 <: R, E1 >: E, A0, In1 <: In, L1 >: L <: In1, Z1](
that: => ZSink[R1, E1, In1, L1, Z1]
)(implicit ev: L <:< In1, trace: Trace): ZSink[R1, E1, In1, L1, Z] =
zipParLeft(that)
/**
* Replaces this sink's result with the provided value.
*/
def as[Z2](z: => Z2)(implicit trace: Trace): ZSink[R, E, In, L, Z2] =
map(_ => z)
/** Repeatedly runs the sink and accumulates its results into a chunk */
def collectAll(implicit ev: L <:< In, trace: Trace): ZSink[R, E, In, L, Chunk[Z]] =
collectAllWhileWith[Chunk[Z]](Chunk.empty)(_ => true)((s, z) => s :+ z)
/**
* Repeatedly runs the sink for as long as its results satisfy the predicate
* `p`. The sink's results will be accumulated using the stepping function
* `f`.
*/
def collectAllWhileWith[S](z: => S)(p: Z => Boolean)(f: (S, Z) => S)(implicit
ev: L <:< In,
trace: Trace
): ZSink[R, E, In, L, S] =
new ZSink(
ZChannel
.fromZIO(Ref.make(Chunk[In]()).zip(Ref.make(false)))
.flatMap { case (leftoversRef, upstreamDoneRef) =>
lazy val upstreamMarker: ZChannel[Any, ZNothing, Chunk[In], Any, Nothing, Chunk[In], Any] =
ZChannel.readWithCause(
(in: Chunk[In]) => ZChannel.write(in) *> upstreamMarker,
ZChannel.refailCause,
(x: Any) => ZChannel.fromZIO(upstreamDoneRef.set(true)).as(x)
)
def loop(currentResult: S): ZChannel[R, ZNothing, Chunk[In], Any, E, Chunk[L], S] =
channel.collectElements
.foldChannel(
ZChannel.fail(_),
{ case (leftovers, doneValue) =>
if (p(doneValue)) {
ZChannel.fromZIO(leftoversRef.set(leftovers.flatten.asInstanceOf[Chunk[In]])) *>
ZChannel.fromZIO(upstreamDoneRef.get).flatMap { upstreamDone =>
val accumulatedResult = f(currentResult, doneValue)
if (upstreamDone) ZChannel.write(leftovers.flatten).as(accumulatedResult)
else loop(accumulatedResult)
}
} else ZChannel.write(leftovers.flatten).as(currentResult)
}
)
upstreamMarker >>> ZChannel.bufferChunk(leftoversRef) >>> loop(z)
}
)
/**
* Collects the leftovers from the stream when the sink succeeds and returns
* them as part of the sink's result
*/
def collectLeftover(implicit trace: Trace): ZSink[R, E, In, Nothing, (Z, Chunk[L])] =
new ZSink(channel.collectElements.map { case (chunks, z) => (z, chunks.flatten) })
/**
* Transforms this sink's input elements.
*/
def contramap[In1](f: In1 => In)(implicit trace: Trace): ZSink[R, E, In1, L, Z] =
contramapChunks(_.map(f))
/**
* Transforms this sink's input chunks. `f` must preserve chunking-invariance
*/
def contramapChunks[In1](
f: Chunk[In1] => Chunk[In]
)(implicit trace: Trace): ZSink[R, E, In1, L, Z] = {
lazy val loop: ZChannel[R, ZNothing, Chunk[In1], Any, Nothing, Chunk[In], Any] =
ZChannel.readWithCause(
chunk => ZChannel.write(f(chunk)) *> loop,
ZChannel.refailCause,
ZChannel.succeed(_)
)
new ZSink(loop >>> self.channel)
}
/**
* Effectfully transforms this sink's input chunks. `f` must preserve
* chunking-invariance
*/
def contramapChunksZIO[R1 <: R, E1 >: E, In1](
f: Chunk[In1] => ZIO[R1, E1, Chunk[In]]
)(implicit trace: Trace): ZSink[R1, E1, In1, L, Z] = {
lazy val loop: ZChannel[R1, ZNothing, Chunk[In1], Any, E1, Chunk[In], Any] =
ZChannel.readWithCause(
chunk => ZChannel.fromZIO(f(chunk)).flatMap(ZChannel.write) *> loop,
ZChannel.refailCause,
ZChannel.succeed(_)
)
new ZSink(loop.pipeToOrFail(self.channel))
}
/**
* Effectfully transforms this sink's input elements.
*/
def contramapZIO[R1 <: R, E1 >: E, In1](
f: In1 => ZIO[R1, E1, In]
)(implicit trace: Trace): ZSink[R1, E1, In1, L, Z] =
contramapChunksZIO(_.mapZIO(f))
/**
* Transforms both inputs and result of this sink using the provided
* functions.
*/
def dimap[In1, Z1](f: In1 => In, g: Z => Z1)(implicit trace: Trace): ZSink[R, E, In1, L, Z1] =
contramap(f).map(g)
/**
* Transforms both input chunks and result of this sink using the provided
* functions.
*/
def dimapChunks[In1, Z1](f: Chunk[In1] => Chunk[In], g: Z => Z1)(implicit
trace: Trace
): ZSink[R, E, In1, L, Z1] =
contramapChunks(f).map(g)
/**
* Effectfully transforms both input chunks and result of this sink using the
* provided functions. `f` and `g` must preserve chunking-invariance
*/
def dimapChunksZIO[R1 <: R, E1 >: E, In1, Z1](
f: Chunk[In1] => ZIO[R1, E1, Chunk[In]],
g: Z => ZIO[R1, E1, Z1]
)(implicit trace: Trace): ZSink[R1, E1, In1, L, Z1] =
contramapChunksZIO(f).mapZIO(g)
/**
* Effectfully transforms both inputs and result of this sink using the
* provided functions.
*/
def dimapZIO[R1 <: R, E1 >: E, In1, Z1](
f: In1 => ZIO[R1, E1, In],
g: Z => ZIO[R1, E1, Z1]
)(implicit trace: Trace): ZSink[R1, E1, In1, L, Z1] =
contramapZIO(f).mapZIO(g)
/**
* Returns a new sink with an attached finalizer. The finalizer is guaranteed
* to be executed so long as the sink begins execution (and regardless of
* whether or not it completes).
*/
final def ensuringWith[R1 <: R](
finalizer: Exit[E, Z] => URIO[R1, Any]
)(implicit trace: Trace): ZSink[R1, E, In, L, Z] =
new ZSink[R1, E, In, L, Z](
channel.ensuringWith(finalizer)
)
/**
* Returns a new sink with an attached finalizer. The finalizer is guaranteed
* to be executed so long as the sink begins execution (and regardless of
* whether or not it completes).
*/
final def ensuring[R1 <: R](
finalizer: => URIO[R1, Any]
)(implicit trace: Trace): ZSink[R1, E, In, L, Z] =
new ZSink[R1, E, In, L, Z](
channel.ensuring(finalizer)
)
/** Filters the sink's input with the given predicate */
def filterInput[In1 <: In](p: In1 => Boolean)(implicit trace: Trace): ZSink[R, E, In1, L, Z] =
contramapChunks(_.filter(p))
/** Filters the sink's input with the given ZIO predicate */
def filterInputZIO[R1 <: R, E1 >: E, In1 <: In](
p: In1 => ZIO[R1, E1, Boolean]
)(implicit trace: Trace): ZSink[R1, E1, In1, L, Z] =
contramapChunksZIO(_.filterZIO(p))
/**
* Creates a sink that produces values until one verifies the predicate `f`.
*/
def findZIO[R1 <: R, E1 >: E](
f: Z => ZIO[R1, E1, Boolean]
)(implicit ev: L <:< In, trace: Trace): ZSink[R1, E1, In, L, Option[Z]] =
new ZSink(
ZChannel
.fromZIO(Ref.make(Chunk[In]()).zip(Ref.make(false)))
.flatMap { case (leftoversRef, upstreamDoneRef) =>
lazy val upstreamMarker: ZChannel[Any, ZNothing, Chunk[In], Any, Nothing, Chunk[In], Any] =
ZChannel.readWithCause(
(in: Chunk[In]) => ZChannel.write(in) *> upstreamMarker,
ZChannel.refailCause,
(x: Any) => ZChannel.fromZIO(upstreamDoneRef.set(true)).as(x)
)
lazy val loop: ZChannel[R1, ZNothing, Chunk[In], Any, E1, Chunk[L], Option[Z]] =
channel.collectElements
.foldChannel(
ZChannel.fail(_),
{ case (leftovers, doneValue) =>
ZChannel.fromZIO(f(doneValue)).flatMap { satisfied =>
ZChannel.fromZIO(leftoversRef.set(leftovers.flatten.asInstanceOf[Chunk[In]])) *>
ZChannel
.fromZIO(upstreamDoneRef.get)
.flatMap { upstreamDone =>
if (satisfied) ZChannel.write(leftovers.flatten).as(Some(doneValue))
else if (upstreamDone)
ZChannel.write(leftovers.flatten).as(None)
else loop
}
}
}
)
upstreamMarker >>> ZChannel.bufferChunk(leftoversRef) >>> loop
}
)
/**
* Runs this sink until it yields a result, then uses that result to create
* another sink from the provided function which will continue to run until it
* yields a result.
*
* This function essentially runs sinks in sequence.
*/
def flatMap[R1 <: R, E1 >: E, In1 <: In, L1 >: L <: In1, Z1](
f: Z => ZSink[R1, E1, In1, L1, Z1]
)(implicit ev: L <:< In1, trace: Trace): ZSink[R1, E1, In1, L1, Z1] =
foldSink(ZSink.fail(_), f)
/** Folds over the result of the sink */
def foldSink[R1 <: R, E2, In1 <: In, L1 >: L <: In1, Z1](
failure: E => ZSink[R1, E2, In1, L1, Z1],
success: Z => ZSink[R1, E2, In1, L1, Z1]
)(implicit ev: L <:< In1, trace: Trace): ZSink[R1, E2, In1, L1, Z1] =
this.foldCauseSink(
_.failureOrCause match {
case Left(err) => failure(err)
case Right(c) => ZSink.failCause(c)
},
success
)
def foldCauseSink[R1 <: R, E2, In1 <: In, L1 >: L <: In1, Z1](
failure: Cause[E] => ZSink[R1, E2, In1, L1, Z1],
success: Z => ZSink[R1, E2, In1, L1, Z1]
)(implicit ev: L <:< In1, trace: Trace): ZSink[R1, E2, In1, L1, Z1] =
new ZSink(
channel.collectElements.foldCauseChannel(
failure(_).channel,
{ case (leftovers, z) =>
ZChannel.suspend {
val leftoversRef = new AtomicReference(leftovers.filter(_.nonEmpty))
val refReader = ZChannel.succeed(leftoversRef.getAndSet(Chunk.empty)).flatMap { chunk =>
// This cast is safe because of the L1 >: L <: In1 bound. It follows that
// L <: In1 and therefore Chunk[L] can be safely cast to Chunk[In1].
val widenedChunk = chunk.asInstanceOf[Chunk[Chunk[In1]]]
ZChannel.writeChunk(widenedChunk)
}
val passthrough = ZChannel.identity[ZNothing, Chunk[In1], Any]
val continuationSink = (refReader *> passthrough) >>> success(z).channel
continuationSink.collectElements.flatMap { case (newLeftovers, z1) =>
ZChannel.succeed(leftoversRef.get).flatMap(ZChannel.writeChunk(_)) *>
ZChannel.writeChunk(newLeftovers).as(z1)
}
}
}
)
)
/** Drains the remaining elements from the stream after the sink finishes */
def ignoreLeftover(implicit trace: Trace): ZSink[R, E, In, Nothing, Z] =
new ZSink(channel.drain)
/**
* Transforms this sink's result.
*/
def map[Z2](f: Z => Z2)(implicit trace: Trace): ZSink[R, E, In, L, Z2] = new ZSink(channel.map(f))
/**
* Transforms the errors emitted by this sink using `f`.
*/
def mapError[E2](f: E => E2)(implicit trace: Trace): ZSink[R, E2, In, L, Z] =
new ZSink(channel.mapError(f))
/**
* Transforms the full causes of failures emitted by this sink.
*/
def mapErrorCause[E2](f: Cause[E] => Cause[E2])(implicit trace: Trace): ZSink[R, E2, In, L, Z] =
new ZSink(channel.mapErrorCause(f))
/**
* Transforms the leftovers emitted by this sink using `f`.
*/
def mapLeftover[L2](f: L => L2)(implicit trace: Trace): ZSink[R, E, In, L2, Z] =
new ZSink(channel.mapOut(_.map(f)))
/**
* Effectfully transforms this sink's result.
*/
def mapZIO[R1 <: R, E1 >: E, Z1](f: Z => ZIO[R1, E1, Z1])(implicit
trace: Trace
): ZSink[R1, E1, In, L, Z1] =
new ZSink(channel.mapZIO(f))
/** Switch to another sink in case of failure */
def orElse[R1 <: R, In1 <: In, E2, L1 >: L, Z1 >: Z](
that: => ZSink[R1, E2, In1, L1, Z1]
)(implicit trace: Trace): ZSink[R1, E2, In1, L1, Z1] =
new ZSink[R1, E2, In1, L1, Z1](self.channel.orElse(that.channel))
/**
* Provides the sink with its required environment, which eliminates its
* dependency on `R`.
*/
def provideEnvironment(
r: => ZEnvironment[R]
)(implicit trace: Trace): ZSink[Any, E, In, L, Z] =
new ZSink(channel.provideEnvironment(r))
/**
* Transforms the environment being provided to the sink with the specified
* function.
*/
def provideSomeEnvironment[R0](
f: ZEnvironment[R0] => ZEnvironment[R]
)(implicit trace: Trace): ZSink[R0, E, In, L, Z] =
new ZSink(channel.provideSomeEnvironment(f))
/**
* Provides a layer to the sink, which translates it to another level.
*/
def provideLayer[E1 >: E, R0](
layer: => ZLayer[R0, E1, R]
)(implicit trace: Trace): ZSink[R0, E1, In, L, Z] =
new ZSink(channel.provideLayer(layer))
/**
* Splits the environment into two parts, providing one part using the
* specified layer and leaving the remainder `R0`.
*
* {{{
* val loggingLayer: ZLayer[Any, Nothing, Logging] = ???
*
* val sink: ZSink[Logging with Database, Nothing, Unit] = ???
*
* val sink2 = sink.provideSomeLayer[Database](loggingLayer)
* }}}
*/
def provideSomeLayer[R0]: ZSink.ProvideSomeLayer[R0, R, E, In, L, Z] =
new ZSink.ProvideSomeLayer[R0, R, E, In, L, Z](self.channel)
/**
* Runs both sinks in parallel on the input, , returning the result or the
* error from the one that finishes first.
*/
def race[R1 <: R, E1 >: E, A0, In1 <: In, L1 >: L, Z1 >: Z](
that: => ZSink[R1, E1, In1, L1, Z1]
)(implicit trace: Trace): ZSink[R1, E1, In1, L1, Z1] =
self.raceBoth(that).map(_.merge)
/**
* Runs both sinks in parallel on the input, returning the result or the error
* from the one that finishes first.
*/
def raceBoth[R1 <: R, E1 >: E, A0, In1 <: In, L1 >: L, Z2](
that: => ZSink[R1, E1, In1, L1, Z2],
capacity: => Int = 16
)(implicit trace: Trace): ZSink[R1, E1, In1, L1, Either[Z, Z2]] =
self.raceWith(that, capacity)(
selfDone => ZChannel.MergeDecision.done(ZIO.done(selfDone).map(Left(_))),
thatDone => ZChannel.MergeDecision.done(ZIO.done(thatDone).map(Right(_)))
)
/**
* Runs both sinks in parallel on the input, using the specified merge
* function as soon as one result or the other has been computed.
*/
def raceWith[R1 <: R, E1 >: E, A0, In1 <: In, L1 >: L, Z1, Z2](
that: => ZSink[R1, E1, In1, L1, Z1],
capacity: => Int = 16
)(
leftDone: Exit[E, Z] => ZChannel.MergeDecision[R1, E1, Z1, E1, Z2],
rightDone: Exit[E1, Z1] => ZChannel.MergeDecision[R1, E, Z, E1, Z2]
)(implicit trace: Trace): ZSink[R1, E1, In1, L1, Z2] = {
def scoped(scope: Scope) =
for {
hub <- Hub.bounded[Either[Exit[Nothing, Any], Chunk[In1]]](capacity)
s1 <- scope.extend(hub.subscribe)
s2 <- scope.extend(hub.subscribe)
reader = ZChannel.toHub[Nothing, Any, Chunk[In1]](hub)
writer = (ZChannel.fromQueue(s1) >>> self.channel <* ZChannel.fromZIO(s1.shutdown))
.mergeWith((ZChannel.fromQueue(s2) >>> that.channel <* ZChannel.fromZIO(s2.shutdown)))(
leftDone,
rightDone
)
channel = reader.mergeWith(writer)(
_ => ZChannel.MergeDecision.await(ZIO.done(_)),
done => ZChannel.MergeDecision.done(ZIO.done(done))
)
} yield new ZSink[R1, E1, In1, L1, Z2](channel)
ZSink.unwrapScopedWith(scoped)
}
def refineOrDie[E1](
pf: PartialFunction[E, E1]
)(implicit ev1: E IsSubtypeOfError Throwable, ev2: CanFail[E], trace: Trace): ZSink[R, E1, In, L, Z] =
refineOrDieWith(pf)(ev1(_))
def refineOrDieWith[E1](
pf: PartialFunction[E, E1]
)(f: E => Throwable)(implicit ev: CanFail[E], trace: Trace): ZSink[R, E1, In, L, Z] =
mapErrorCause(_.flatMap(pf.andThen(Cause.fail(_)).applyOrElse(_, (e: E) => Cause.die(f(e)))))
/**
* Returns the sink that executes this one and times its execution.
*/
def timed(implicit trace: Trace): ZSink[R, E, In, L, (Z, Duration)] =
summarized(Clock.nanoTime)((start, end) => Duration.fromNanos(end - start))
/**
* Splits the sink on the specified predicate, returning a new sink that
* consumes elements until an element after the first satisfies the specified
* predicate.
*/
def splitWhere[In1 <: In](
f: In1 => Boolean
)(implicit ev: L <:< In1, trace: Trace): ZSink[R, E, In1, In1, Z] = {
def splitter(
written: Boolean,
leftovers: Ref[Chunk[In1]]
): ZChannel[R, ZNothing, Chunk[In1], Any, E, Chunk[In1], Any] =
ZChannel.readWithCause(
in =>
if (in.isEmpty) splitter(written, leftovers)
else if (written) {
val index = in.indexWhere(f)
if (index == -1)
ZChannel.write(in) *> splitter(true, leftovers)
else {
val (left, right) = in.splitAt(index)
ZChannel.write(left) *> ZChannel.fromZIO(leftovers.set(right))
}
} else {
val index = in.indexWhere(f, 1)
if (index == -1)
ZChannel.write(in) *> splitter(true, leftovers)
else {
val (left, right) = in.splitAt(index max 1)
ZChannel.write(left) *> ZChannel.fromZIO(leftovers.set(right))
}
},
err => ZChannel.refailCause(err),
done => ZChannel.succeed(done)
)
new ZSink(
ZChannel.fromZIO(Ref.make[Chunk[In1]](Chunk.empty)).flatMap { ref =>
splitter(false, ref)
.pipeToOrFail(self.channel)
.collectElements
.flatMap { case (leftovers, z) =>
ZChannel.fromZIO(ref.get).flatMap { leftover =>
ZChannel.write(leftover ++ leftovers.flatten.map(ev)) *> ZChannel.succeed(z)
}
}
}
)
}
/**
* Summarize a sink by running an effect when the sink starts and again when
* it completes
*/
def summarized[R1 <: R, E1 >: E, B, C](
summary: => ZIO[R1, E1, B]
)(f: (B, B) => C)(implicit trace: Trace): ZSink[R1, E1, In, L, (Z, C)] =
new ZSink[R1, E1, In, L, (Z, C)](
ZChannel.unwrap {
ZIO.succeed(summary).map { summary =>
ZChannel.fromZIO(summary).flatMap { start =>
self.channel.flatMap { done =>
ZChannel.fromZIO(summary).map { end =>
(done, f(start, end))
}
}
}
}
}
)
/** Converts ths sink to its underlying channel */
def toChannel: ZChannel[R, ZNothing, Chunk[In], Any, E, Chunk[L], Z] =
self.channel
/**
* Feeds inputs to this sink until it yields a result, then switches over to
* the provided sink until it yields a result, finally combining the two
* results into a tuple.
*/
def zip[R1 <: R, In1 <: In, E1 >: E, L1 >: L <: In1, Z1](
that: => ZSink[R1, E1, In1, L1, Z1]
)(implicit
zippable: Zippable[Z, Z1],
ev: L <:< In1,
trace: Trace
): ZSink[R1, E1, In1, L1, zippable.Out] =
zipWith[R1, E1, In1, L1, Z1, zippable.Out](that)(zippable.zip(_, _))
/**
* Like [[zip]], but keeps only the result from the `that` sink.
*/
def zipLeft[R1 <: R, In1 <: In, E1 >: E, L1 >: L <: In1, Z1](
that: => ZSink[R1, E1, In1, L1, Z1]
)(implicit ev: L <:< In1, trace: Trace): ZSink[R1, E1, In1, L1, Z] =
zipWith[R1, E1, In1, L1, Z1, Z](that)((z, _) => z)
/**
* Runs both sinks in parallel on the input and combines the results in a
* tuple.
*/
def zipPar[R1 <: R, In1 <: In, E1 >: E, L1 >: L <: In1, Z1](
that: => ZSink[R1, E1, In1, L1, Z1]
)(implicit zippable: Zippable[Z, Z1], trace: Trace): ZSink[R1, E1, In1, L1, zippable.Out] =
zipWithPar[R1, E1, In1, L1, Z1, zippable.Out](that)(zippable.zip(_, _))
/**
* Like [[zipPar]], but keeps only the result from this sink.
*/
def zipParLeft[R1 <: R, In1 <: In, E1 >: E, L1 >: L <: In1, Z1](
that: => ZSink[R1, E1, In1, L1, Z1]
)(implicit trace: Trace): ZSink[R1, E1, In1, L1, Z] =
zipWithPar[R1, E1, In1, L1, Z1, Z](that)((b, _) => b)
/**
* Like [[zipPar]], but keeps only the result from the `that` sink.
*/
def zipParRight[R1 <: R, In1 <: In, E1 >: E, L1 >: L <: In1, Z1](
that: => ZSink[R1, E1, In1, L1, Z1]
)(implicit trace: Trace): ZSink[R1, E1, In1, L1, Z1] =
zipWithPar[R1, E1, In1, L1, Z1, Z1](that)((_, c) => c)
/**
* Like [[zip]], but keeps only the result from this sink.
*/
def zipRight[R1 <: R, In1 <: In, E1 >: E, L1 >: L <: In1, Z1](
that: => ZSink[R1, E1, In1, L1, Z1]
)(implicit ev: L <:< In1, trace: Trace): ZSink[R1, E1, In1, L1, Z1] =
zipWith[R1, E1, In1, L1, Z1, Z1](that)((_, z1) => z1)
/**
* Feeds inputs to this sink until it yields a result, then switches over to
* the provided sink until it yields a result, finally combining the two
* results with `f`.
*/
def zipWith[R1 <: R, E1 >: E, In1 <: In, L1 >: L <: In1, Z1, Z2](
that: => ZSink[R1, E1, In1, L1, Z1]
)(f: (Z, Z1) => Z2)(implicit ev: L <:< In1, trace: Trace): ZSink[R1, E1, In1, L1, Z2] =
flatMap(z => that.map(f(z, _)))
/**
* Runs both sinks in parallel on the input and combines the results using the
* provided function.
*/
def zipWithPar[R1 <: R, E1 >: E, In1 <: In, L1 >: L <: In1, Z1, Z2](
that: => ZSink[R1, E1, In1, L1, Z1]
)(f: (Z, Z1) => Z2)(implicit trace: Trace): ZSink[R1, E1, In1, L1, Z2] =
self.raceWith(that)(
{
case Exit.Failure(err) => ZChannel.MergeDecision.done(Exit.failCause(err))
case Exit.Success(lz) =>
ZChannel.MergeDecision.await {
case Exit.Failure(cause) => Exit.failCause(cause)
case Exit.Success(rz) => ZIO.succeed(f(lz, rz))
}
},
{
case Exit.Failure(err) => ZChannel.MergeDecision.done(Exit.failCause(err))
case Exit.Success(rz) =>
ZChannel.MergeDecision.await {
case Exit.Failure(cause) => Exit.failCause(cause)
case Exit.Success(lz) => ZIO.succeed(f(lz, rz))
}
}
)
}
object ZSink extends ZSinkPlatformSpecificConstructors {
def collectAll[In](implicit trace: Trace): ZSink[Any, Nothing, In, Nothing, Chunk[In]] = {
def loop(acc: Chunk[In]): ZChannel[Any, ZNothing, Chunk[In], Any, Nothing, Nothing, Chunk[In]] =
ZChannel.readWithCause(
chunk => loop(acc ++ chunk),
ZChannel.refailCause,
_ => ZChannel.succeed(acc)
)
new ZSink(loop(Chunk.empty))
}
/**
* A sink that collects first `n` elements into a chunk.
*/
def collectAllN[In](n: => Int)(implicit trace: Trace): ZSink[Any, Nothing, In, In, Chunk[In]] = {
def collectAllChunksN(
n: Int,
acc: Chunk[In]
): ZChannel[Any, ZNothing, Chunk[In], Any, Nothing, Chunk[In], Chunk[In]] =
ZChannel.readWithCause(
chunk => {
val (collected, leftovers) = chunk.splitAt(n)
if (collected.length < n) collectAllChunksN(n - collected.length, acc ++ collected)
else if (leftovers.isEmpty) ZChannel.succeed(acc ++ collected)
else ZChannel.write(leftovers) *> ZChannel.succeed(acc ++ collected)
},
err => ZChannel.refailCause(err),
_ => ZChannel.succeed(acc)
)
ZSink.suspend(ZSink.fromChannel(collectAllChunksN(n, Chunk.empty)))
}
/**
* A sink that collects all of its inputs into a map. The keys are extracted
* from inputs using the keying function `key`; if multiple inputs use the
* same key, they are merged using the `f` function.
*/
def collectAllToMap[In, K](
key: In => K
)(f: (In, In) => In)(implicit trace: Trace): ZSink[Any, Nothing, In, Nothing, Map[K, In]] =
foldLeftChunks(Map[K, In]()) { (acc, as) =>
as.foldLeft(acc) { (acc, a) =>
val k = key(a)
acc.updated(
k,
// Avoiding `get/getOrElse` here to avoid an Option allocation
if (acc.contains(k)) f(acc(k), a)
else a
)
}
}
/**
* A sink that collects first `n` keys into a map. The keys are calculated
* from inputs using the keying function `key`; if multiple inputs use the the
* same key, they are merged using the `f` function.
*/
def collectAllToMapN[Err, In, K](
n: => Long
)(key: In => K)(f: (In, In) => In)(implicit trace: Trace): ZSink[Any, Err, In, In, Map[K, In]] =
foldWeighted[In, Map[K, In]](Map())((acc, in) => if (acc.contains(key(in))) 0 else 1, n) { (acc, in) =>
val k = key(in)
val v = if (acc.contains(k)) f(acc(k), in) else in
acc.updated(k, v)
}
/**
* A sink that collects all of its inputs into a map. The keys are extracted
* from inputs using the keying function `key`; The values are extracted using
* the value function `value` if multiple inputs use the same key, they are
* merged using the `f` function.
*/
def collectAllToMapValue[In, K, V](
key: In => K
)(value: In => V)(f: (V, V) => V)(implicit trace: Trace): ZSink[Any, Nothing, In, Nothing, Map[K, V]] =
foldLeftChunks(Map[K, V]()) { (acc, as) =>
as.foldLeft(acc) { (acc, a) =>
val k = key(a)
acc.updated(
k,
// Avoiding `get/getOrElse` here to avoid an Option allocation
if (acc.contains(k)) f(acc(k), value(a))
else value(a)
)
}
}
/**
* A sink that collects first `n` keys into a map. The keys are calculated
* from inputs using the keying function `key`; The values are extracted using
* * the value function `value` if multiple inputs use the the same key, they
* are merged using the `f` function.
*/
def collectAllToMapValueN[Err, In, K, V](
n: => Long
)(key: In => K)(value: In => V)(f: (V, V) => V)(implicit trace: Trace): ZSink[Any, Err, In, In, Map[K, V]] =
foldWeighted[In, Map[K, V]](Map())((acc, in) => if (acc.contains(key(in))) 0 else 1, n) { (acc, in) =>
val k = key(in)
val v = if (acc.contains(k)) f(acc(k), value(in)) else value(in)
acc.updated(k, v)
}
/**
* A sink that collects all of its inputs into a set.
*/
def collectAllToSet[In](implicit trace: Trace): ZSink[Any, Nothing, In, Nothing, Set[In]] =
foldLeftChunks(Set[In]())((acc, as) => as.foldLeft(acc)(_ + _))
/**
* A sink that collects first `n` distinct inputs into a set.
*/
def collectAllToSetN[In](n: => Long)(implicit trace: Trace): ZSink[Any, Nothing, In, In, Set[In]] =
foldWeighted[In, Set[In]](Set())((acc, in) => if (acc.contains(in)) 0 else 1, n)(_ + _)
/**
* Accumulates incoming elements into a chunk until predicate `p` is
* satisfied.
*/
def collectAllUntil[In](p: In => Boolean)(implicit
trace: Trace
): ZSink[Any, Nothing, In, In, Chunk[In]] =
fold[In, (List[In], Boolean)]((Nil, true))(_._2) { case ((as, _), a) =>
(a :: as, !p(a))
}.map { case (is, _) =>
Chunk.fromIterable(is.reverse)
}
/**
* Accumulates incoming elements into a chunk until effectful predicate `p` is
* satisfied.
*/
def collectAllUntilZIO[Env, Err, In](p: In => ZIO[Env, Err, Boolean])(implicit
trace: Trace
): ZSink[Env, Err, In, In, Chunk[In]] =
foldZIO[Env, Err, In, (List[In], Boolean)]((Nil, true))(_._2) { case ((as, _), a) =>
p(a).map(bool => (a :: as, !bool))
}.map { case (is, _) =>
Chunk.fromIterable(is.reverse)
}
/**
* Accumulates incoming elements into a chunk as long as they verify predicate
* `p`.
*/
def collectAllWhile[In](p: In => Boolean)(implicit
trace: Trace
): ZSink[Any, Nothing, In, In, Chunk[In]] = {
def channel(done: Chunk[In]): ZChannel[Any, ZNothing, Chunk[In], Any, Nothing, Chunk[In], Chunk[In]] =
ZChannel.readWithCause(
in => {
val (collected, leftovers) = in.span(p)
if (leftovers.isEmpty) channel(done ++ collected)
else ZChannel.write(leftovers) *> ZChannel.succeed(done ++ collected)
},
ZChannel.refailCause,
_ => ZChannel.succeed(done)
)
ZSink.fromChannel(channel(Chunk.empty))
}
/**
* Accumulates incoming elements into a chunk as long as they verify effectful
* predicate `p`.
*/
def collectAllWhileZIO[Env, Err, In](p: In => ZIO[Env, Err, Boolean])(implicit
trace: Trace
): ZSink[Env, Err, In, In, Chunk[In]] = {
def channel(done: Chunk[In]): ZChannel[Env, ZNothing, Chunk[In], Any, Err, Chunk[In], Chunk[In]] =
ZChannel.readWithCause(
in => {
ZChannel.fromZIO(in.takeWhileZIO(p)).flatMap { collected =>
val leftovers = in.drop(collected.length)
if (leftovers.isEmpty) channel(done ++ collected)
else ZChannel.write(leftovers) *> ZChannel.succeed(done ++ collected)
}
},
ZChannel.refailCause,
_ => ZChannel.succeed(done)
)
ZSink.fromChannel(channel(Chunk.empty))
}
/**
* A sink that counts the number of elements fed to it.
*/
def count(implicit trace: Trace): ZSink[Any, Nothing, Any, Nothing, Long] =
foldLeftChunks(0L)((s, chunk) => s + chunk.length)
/**
* Creates a sink halting with the specified `Throwable`.
*/
def die(e: => Throwable)(implicit trace: Trace): ZSink[Any, Nothing, Any, Nothing, Nothing] =
ZSink.failCause(Cause.die(e))
/**
* Creates a sink halting with the specified message, wrapped in a
* `RuntimeException`.
*/
def dieMessage(m: => String)(implicit trace: Trace): ZSink[Any, Nothing, Any, Nothing, Nothing] =
ZSink.failCause(Cause.die(new RuntimeException(m)))
/**
* A sink that ignores its inputs.
*/
def drain(implicit trace: Trace): ZSink[Any, Nothing, Any, Nothing, Unit] =
new ZSink(ZPipeline.drain.toChannel.unit)
/**
* Drops incoming elements until the predicate `p` is satisfied.
*/
def dropUntil[In](p: In => Boolean)(implicit trace: Trace): ZSink[Any, Nothing, In, In, Any] =
new ZSink(ZPipeline.dropUntil(p).toChannel)
/**
* Drops incoming elements until the effectful predicate `p` is satisfied.
*/
def dropUntilZIO[R, InErr, In](
p: In => ZIO[R, InErr, Boolean]
)(implicit trace: Trace): ZSink[R, InErr, In, In, Any] =
new ZSink(ZPipeline.dropUntilZIO(p).toChannel)
/**
* Drops incoming elements as long as the predicate `p` is satisfied.
*/
def dropWhile[In](p: In => Boolean)(implicit trace: Trace): ZSink[Any, Nothing, In, In, Any] =
new ZSink(ZPipeline.dropWhile(p).toChannel)
/**
* Drops incoming elements as long as the effectful predicate `p` is
* satisfied.
*/
def dropWhileZIO[R, InErr, In](
p: In => ZIO[R, InErr, Boolean]
)(implicit trace: Trace): ZSink[R, InErr, In, In, Any] =
new ZSink(ZPipeline.dropWhileZIO(p).toChannel)
/**
* Accesses the whole environment of the sink.
*/
def environment[R](implicit trace: Trace): ZSink[R, Nothing, Any, Nothing, ZEnvironment[R]] =
fromZIO(ZIO.environment[R])
/**
* Accesses the environment of the sink.
*/
def environmentWith[R]: EnvironmentWithPartiallyApplied[R] =
new EnvironmentWithPartiallyApplied[R]
/**
* Accesses the environment of the sink in the context of an effect.
*/
def environmentWithZIO[R]: EnvironmentWithZIOPartiallyApplied[R] =
new EnvironmentWithZIOPartiallyApplied[R]
/**
* Accesses the environment of the sink in the context of a sink.
*/
def environmentWithSink[R]: EnvironmentWithSinkPartiallyApplied[R] =
new EnvironmentWithSinkPartiallyApplied[R]
/**
* A sink that returns whether an element satisfies the specified predicate.
*/
def exists[In](f: In => Boolean)(implicit trace: Trace): ZSink[Any, Nothing, In, In, Boolean] =
fold(false)(!_)(_ || f(_))
/**
* A sink that always fails with the specified error.
*/
def fail[E](e: => E)(implicit trace: Trace): ZSink[Any, E, Any, Nothing, Nothing] = new ZSink(
ZChannel.fail(e)
)
/**
* Creates a sink halting with a specified cause.
*/
def failCause[E](e: => Cause[E])(implicit trace: Trace): ZSink[Any, E, Any, Nothing, Nothing] =
new ZSink(ZChannel.failCause(e))
/**
* A sink that folds its inputs with the provided function, termination
* predicate and initial state.
*/
def fold[In, S](
z: => S
)(contFn: S => Boolean)(f: (S, In) => S)(implicit trace: Trace): ZSink[Any, Nothing, In, In, S] =
ZSink.suspend {
def foldChunkSplit(z: S, chunk: Chunk[In]): (S, Chunk[In]) = {
@tailrec
def fold(s: S, chunk: Chunk[In], idx: Int, len: Int): (S, Chunk[In]) =
if (idx == len) (s, Chunk.empty)
else {
val s1 = f(s, chunk(idx))
if (contFn(s1)) fold(s1, chunk, idx + 1, len)
else (s1, chunk.drop(idx + 1))
}
fold(z, chunk, 0, chunk.length)
}
def reader(s: S): ZChannel[Any, ZNothing, Chunk[In], Any, Nothing, Chunk[In], S] =
if (!contFn(s)) ZChannel.succeedNow(s)
else
ZChannel.readWithCause(
(in: Chunk[In]) => {
val (nextS, leftovers) = foldChunkSplit(s, in)
if (leftovers.nonEmpty) ZChannel.write(leftovers).as(nextS)
else reader(nextS)
},
(err: Cause[ZNothing]) => ZChannel.refailCause(err),
(_: Any) => ZChannel.succeedNow(s)
)
new ZSink(reader(z))
}
/**
* A sink that folds its input chunks with the provided function, termination
* predicate and initial state. `contFn` condition is checked only for the
* initial value and at the end of processing of each chunk. `f` and `contFn`
* must preserve chunking-invariance.
*/
def foldChunks[In, S](
z: => S
)(
contFn: S => Boolean
)(f: (S, Chunk[In]) => S)(implicit trace: Trace): ZSink[Any, Nothing, In, Nothing, S] =
ZSink.suspend {
def reader(s: S): ZChannel[Any, ZNothing, Chunk[In], Any, Nothing, Nothing, S] =
if (!contFn(s)) ZChannel.succeedNow(s)
else
ZChannel.readWithCause(
(in: Chunk[In]) => {
val nextS = f(s, in)
reader(nextS)
},
(err: Cause[ZNothing]) => ZChannel.refailCause(err),
(_: Any) => ZChannel.succeedNow(s)
)
new ZSink(reader(z))
}
/**
* A sink that effectfully folds its input chunks with the provided function,
* termination predicate and initial state. `contFn` condition is checked only
* for the initial value and at the end of processing of each chunk. `f` and
* `contFn` must preserve chunking-invariance.
*/
def foldChunksZIO[Env, Err, In, S](
z: => S
)(
contFn: S => Boolean
)(f: (S, Chunk[In]) => ZIO[Env, Err, S])(implicit trace: Trace): ZSink[Env, Err, In, In, S] =
ZSink.suspend {
def reader(s: S): ZChannel[Env, Err, Chunk[In], Any, Err, Nothing, S] =
if (!contFn(s)) ZChannel.succeedNow(s)
else
ZChannel.readWithCause(
(in: Chunk[In]) => ZChannel.fromZIO(f(s, in)).flatMap(reader),
(err: Cause[Err]) => ZChannel.refailCause(err),
(_: Any) => ZChannel.succeedNow(s)
)
new ZSink(reader(z))
}
/**
* A sink that folds its inputs with the provided function and initial state.
*/
def foldLeft[In, S](z: => S)(f: (S, In) => S)(implicit trace: Trace): ZSink[Any, Nothing, In, Nothing, S] =
fold(z)(_ => true)(f).ignoreLeftover
/**
* A sink that folds its input chunks with the provided function and initial
* state. `f` must preserve chunking-invariance.
*/
def foldLeftChunks[In, S](z: => S)(f: (S, Chunk[In]) => S)(implicit
trace: Trace
): ZSink[Any, Nothing, In, Nothing, S] =
foldChunks[In, S](z)(_ => true)(f)
/**
* A sink that effectfully folds its input chunks with the provided function
* and initial state. `f` must preserve chunking-invariance.
*/
def foldLeftChunksZIO[R, Err, In, S](z: => S)(
f: (S, Chunk[In]) => ZIO[R, Err, S]
)(implicit trace: Trace): ZSink[R, Err, In, Nothing, S] =
foldChunksZIO[R, Err, In, S](z)(_ => true)(f).ignoreLeftover
/**
* A sink that effectfully folds its inputs with the provided function and
* initial state.
*/
def foldLeftZIO[R, Err, In, S](z: => S)(
f: (S, In) => ZIO[R, Err, S]
)(implicit trace: Trace): ZSink[R, Err, In, Nothing, S] =
foldZIO[R, Err, In, S](z)(_ => true)(f).ignoreLeftover
/**
* Creates a sink that folds elements of type `In` into a structure of type
* `S` until `max` elements have been folded.
*
* Like [[foldWeighted]], but with a constant cost function of 1.
*/
def foldUntil[In, S](z: => S, max: => Long)(f: (S, In) => S)(implicit
trace: Trace
): ZSink[Any, Nothing, In, In, S] =
ZSink.unwrap {
ZIO.succeed(max).map { max =>
fold[In, (S, Long)]((z, 0))(_._2 < max) { case ((o, count), i) =>
(f(o, i), count + 1)
}.map(_._1)
}
}
/**
* Creates a sink that effectfully folds elements of type `In` into a
* structure of type `S` until `max` elements have been folded.
*
* Like [[foldWeightedZIO]], but with a constant cost function of 1.
*/
def foldUntilZIO[Env, Err, In, S](z: => S, max: => Long)(
f: (S, In) => ZIO[Env, Err, S]
)(implicit trace: Trace): ZSink[Env, Err, In, In, S] =
foldZIO[Env, Err, In, (S, Long)]((z, 0))(_._2 < max) { case ((o, count), i) =>
f(o, i).map((_, count + 1))
}.map(_._1)
/**
* Creates a sink that folds elements of type `In` into a structure of type
* `S`, until `max` worth of elements (determined by the `costFn`) have been
* folded.
*
* @note
* Elements that have an individual cost larger than `max` will force the
* sink to cross the `max` cost. See [[foldWeightedDecompose]] for a variant
* that can handle these cases.
*/
def foldWeighted[In, S](z: => S)(costFn: (S, In) => Long, max: => Long)(
f: (S, In) => S
)(implicit trace: Trace): ZSink[Any, Nothing, In, In, S] =
foldWeightedDecompose[In, S](z)(costFn, max, Chunk.single(_))(f)
/**
* Creates a sink that folds elements of type `In` into a structure of type
* `S`, until `max` worth of elements (determined by the `costFn`) have been
* folded.
*
* The `decompose` function will be used for decomposing elements that cause
* an `S` aggregate to cross `max` into smaller elements. For example:
* {{{
* Stream(1, 5, 1)
* .transduce(
* ZSink
* .foldWeightedDecompose(List[Int]())((i: Int) => i.toLong, 4,
* (i: Int) => Chunk(i - 1, 1)) { (acc, el) =>
* el :: acc
* }
* .map(_.reverse)
* )
* .runCollect
* }}}
*
* The stream would emit the elements `List(1), List(4), List(1, 1)`.
*
* Be vigilant with this function, it has to generate "simpler" values or the
* fold may never end. A value is considered indivisible if `decompose` yields
* the empty chunk or a single-valued chunk. In these cases, there is no other
* choice than to yield a value that will cross the threshold.
*
* The [[foldWeightedDecomposeZIO]] allows the decompose function to return a
* `ZIO` value, and consequently it allows the sink to fail.
*/
def foldWeightedDecompose[In, S](
z: => S
)(costFn: (S, In) => Long, max: => Long, decompose: In => Chunk[In])(
f: (S, In) => S
)(implicit trace: Trace): ZSink[Any, Nothing, In, In, S] =
ZSink.suspend {
def go(
s: S,
cost: Long,
dirty: Boolean,
max: Long
): ZChannel[Any, ZNothing, Chunk[In], Any, Nothing, Chunk[In], S] =
ZChannel.readWithCause(
(in: Chunk[In]) => {
def fold(in: Chunk[In], s: S, dirty: Boolean, cost: Long, idx: Int): (S, Long, Boolean, Chunk[In]) =
if (idx == in.length) (s, cost, dirty, Chunk.empty)
else {
val elem = in(idx)
val total = cost + costFn(s, elem)
if (total <= max) fold(in, f(s, elem), true, total, idx + 1)
else {
val decomposed = decompose(elem)
if (decomposed.length <= 1 && !dirty)
// If `elem` cannot be decomposed, we need to cross the `max` threshold. To
// minimize "injury", we only allow this when we haven't added anything else
// to the aggregate (dirty = false).
(f(s, elem), total, true, in.drop(idx + 1))
else if (decomposed.length <= 1 && dirty)
// If the state is dirty and `elem` cannot be decomposed, we stop folding
// and include `elem` in th leftovers.
(s, cost, dirty, in.drop(idx))
else
// `elem` got decomposed, so we will recurse with the decomposed elements pushed
// into the chunk we're processing and see if we can aggregate further.
fold(decomposed ++ in.drop(idx + 1), s, dirty, cost, 0)
}
}
val (nextS, nextCost, nextDirty, leftovers) = fold(in, s, dirty, cost, 0)
if (leftovers.nonEmpty) ZChannel.write(leftovers) *> ZChannel.succeedNow(nextS)
else if (cost > max) ZChannel.succeedNow(nextS)
else go(nextS, nextCost, nextDirty, max)
},
(err: Cause[ZNothing]) => ZChannel.refailCause(err),
(_: Any) => ZChannel.succeedNow(s)
)
new ZSink(go(z, 0, false, max))
}
/**
* Creates a sink that effectfully folds elements of type `In` into a
* structure of type `S`, until `max` worth of elements (determined by the
* `costFn`) have been folded.
*
* The `decompose` function will be used for decomposing elements that cause
* an `S` aggregate to cross `max` into smaller elements. Be vigilant with
* this function, it has to generate "simpler" values or the fold may never
* end. A value is considered indivisible if `decompose` yields the empty
* chunk or a single-valued chunk. In these cases, there is no other choice
* than to yield a value that will cross the threshold.
*
* See [[foldWeightedDecompose]] for an example.
*/
def foldWeightedDecomposeZIO[Env, Err, In, S](z: => S)(
costFn: (S, In) => ZIO[Env, Err, Long],
max: => Long,
decompose: In => ZIO[Env, Err, Chunk[In]]
)(f: (S, In) => ZIO[Env, Err, S])(implicit trace: Trace): ZSink[Env, Err, In, In, S] =
ZSink.suspend {
def go(s: S, cost: Long, dirty: Boolean, max: Long): ZChannel[Env, Err, Chunk[In], Any, Err, Chunk[In], S] =
ZChannel.readWithCause(
(in: Chunk[In]) => {
def fold(
in: Chunk[In],
s: S,
dirty: Boolean,
cost: Long,
idx: Int
): ZIO[Env, Err, (S, Long, Boolean, Chunk[In])] =
if (idx == in.length) ZIO.succeed((s, cost, dirty, Chunk.empty))
else {
val elem = in(idx)
costFn(s, elem).map(cost + _).flatMap { total =>
if (total <= max) f(s, elem).flatMap(fold(in, _, true, total, idx + 1))
else
decompose(elem).flatMap { decomposed =>
if (decomposed.length <= 1 && !dirty)
// If `elem` cannot be decomposed, we need to cross the `max` threshold. To
// minimize "injury", we only allow this when we haven't added anything else
// to the aggregate (dirty = false).
f(s, elem).map((_, total, true, in.drop(idx + 1)))
else if (decomposed.length <= 1 && dirty)
// If the state is dirty and `elem` cannot be decomposed, we stop folding
// and include `elem` in th leftovers.
ZIO.succeed((s, cost, dirty, in.drop(idx)))
else
// `elem` got decomposed, so we will recurse with the decomposed elements pushed
// into the chunk we're processing and see if we can aggregate further.
fold(decomposed ++ in.drop(idx + 1), s, dirty, cost, 0)
}
}
}
ZChannel.fromZIO(fold(in, s, dirty, cost, 0)).flatMap { case (nextS, nextCost, nextDirty, leftovers) =>
if (leftovers.nonEmpty) ZChannel.write(leftovers) *> ZChannel.succeedNow(nextS)
else if (cost > max) ZChannel.succeedNow(nextS)
else go(nextS, nextCost, nextDirty, max)
}
},
(err: Cause[Err]) => ZChannel.refailCause(err),
(_: Any) => ZChannel.succeedNow(s)
)
new ZSink(go(z, 0, false, max))
}
/**
* Creates a sink that effectfully folds elements of type `In` into a
* structure of type `S`, until `max` worth of elements (determined by the
* `costFn`) have been folded.
*
* @note
* Elements that have an individual cost larger than `max` will force the
* sink to cross the `max` cost. See [[foldWeightedDecomposeZIO]] for a
* variant that can handle these cases.
*/
def foldWeightedZIO[Env, Err, In, S](
z: => S
)(costFn: (S, In) => ZIO[Env, Err, Long], max: Long)(
f: (S, In) => ZIO[Env, Err, S]
)(implicit trace: Trace): ZSink[Env, Err, In, In, S] =
foldWeightedDecomposeZIO(z)(costFn, max, (i: In) => ZIO.succeed(Chunk.single(i)))(f)
/**
* A sink that effectfully folds its inputs with the provided function,
* termination predicate and initial state.
*/
def foldZIO[Env, Err, In, S](z: => S)(contFn: S => Boolean)(
f: (S, In) => ZIO[Env, Err, S]
)(implicit trace: Trace): ZSink[Env, Err, In, In, S] =
ZSink.suspend {
def foldChunkSplitZIO(z: S, chunk: Chunk[In])(
contFn: S => Boolean
)(f: (S, In) => ZIO[Env, Err, S]): ZIO[Env, Err, (S, Option[Chunk[In]])] = {
def fold(s: S, chunk: Chunk[In], idx: Int, len: Int): ZIO[Env, Err, (S, Option[Chunk[In]])] =
if (idx == len) ZIO.succeed((s, None))
else
f(s, chunk(idx)).flatMap { s1 =>
if (contFn(s1)) {
fold(s1, chunk, idx + 1, len)
} else {
ZIO.succeed((s1, Some(chunk.drop(idx + 1))))
}
}
fold(z, chunk, 0, chunk.length)
}
def reader(s: S): ZChannel[Env, Err, Chunk[In], Any, Err, Chunk[In], S] =
if (!contFn(s)) ZChannel.succeedNow(s)
else
ZChannel.readWithCause(
(in: Chunk[In]) =>
ZChannel.fromZIO(foldChunkSplitZIO(s, in)(contFn)(f)).flatMap { case (nextS, leftovers) =>
leftovers match {
case Some(l) => ZChannel.write(l).as(nextS)
case None => reader(nextS)
}
},
(err: Cause[Err]) => ZChannel.refailCause(err),
(_: Any) => ZChannel.succeedNow(s)
)
new ZSink(reader(z))
}
/**
* A sink that returns whether all elements satisfy the specified predicate.
*/
def forall[In](f: In => Boolean)(implicit trace: Trace): ZSink[Any, Nothing, In, In, Boolean] =
fold(true)(identity)(_ && f(_))
/**
* A sink that executes the provided effectful function for every element fed
* to it.
*/
def foreach[R, Err, In](
f: In => ZIO[R, Err, Any]
)(implicit trace: Trace): ZSink[R, Err, In, Nothing, Unit] = {
lazy val process: ZChannel[R, Err, Chunk[In], Any, Err, Nothing, Unit] =
ZChannel.readWithCause(
in => ZChannel.fromZIO(ZIO.foreachDiscard(in)(f(_))) *> process,
halt => ZChannel.refailCause(halt),
_ => ZChannel.unit
)
new ZSink(process)
}
/**
* A sink that executes the provided effectful function for every chunk fed to
* it.
*/
def foreachChunk[R, Err, In](
f: Chunk[In] => ZIO[R, Err, Any]
)(implicit trace: Trace): ZSink[R, Err, In, Nothing, Unit] = {
lazy val process: ZChannel[R, Err, Chunk[In], Any, Err, Nothing, Unit] =
ZChannel.readWithCause(
in => ZChannel.fromZIO(f(in)) *> process,
halt => ZChannel.refailCause(halt),
_ => ZChannel.unit
)
new ZSink(process)
}
/**
* A sink that executes the provided effectful function for every element fed
* to it until `f` evaluates to `false`.
*/
def foreachWhile[R, Err, In](
f: In => ZIO[R, Err, Boolean]
)(implicit trace: Trace): ZSink[R, Err, In, In, Unit] = {
def go(
chunk: Chunk[In],
idx: Int,
len: Int,
cont: ZChannel[R, Err, Chunk[In], Any, Err, Chunk[In], Unit]
): ZChannel[R, Err, Chunk[In], Any, Err, Chunk[In], Unit] =
if (idx == len)
cont
else
ZChannel
.fromZIO(f(chunk(idx)))
.flatMap(b => if (b) go(chunk, idx + 1, len, cont) else ZChannel.write(chunk.drop(idx)))
.catchAll(e => ZChannel.write(chunk.drop(idx)) *> ZChannel.fail(e))
lazy val process: ZChannel[R, Err, Chunk[In], Any, Err, Chunk[In], Unit] =
ZChannel.readWithCause(
in => go(in, 0, in.length, process),
halt => ZChannel.refailCause(halt),
_ => ZChannel.unit
)
new ZSink(process)
}
/**
* A sink that executes the provided effectful function for every chunk fed to
* it until `f` evaluates to `false`.
*/
def foreachChunkWhile[R, Err, In](
f: Chunk[In] => ZIO[R, Err, Boolean]
)(implicit trace: Trace): ZSink[R, Err, In, In, Unit] = {
lazy val reader: ZChannel[R, Err, Chunk[In], Any, Err, Nothing, Unit] =
ZChannel.readWithCause(
(in: Chunk[In]) =>
ZChannel.fromZIO(f(in)).flatMap { continue =>
if (continue) reader
else ZChannel.unit
},
(err: Cause[Err]) => ZChannel.refailCause(err),
(_: Any) => ZChannel.unit
)
new ZSink(reader)
}
/**
* Creates a sink from a [[zio.stream.ZChannel]]
*/
def fromChannel[R, E, In, L, Z](
channel: ZChannel[R, ZNothing, Chunk[In], Any, E, Chunk[L], Z]
): ZSink[R, E, In, L, Z] =
new ZSink(channel)
/**
* Creates a sink from a chunk processing function.
*/
def fromPush[R, E, I, L, Z](
push: ZIO[Scope with R, Nothing, Option[Chunk[I]] => ZIO[R, (Either[E, Z], Chunk[L]), Unit]]
)(implicit trace: Trace): ZSink[R, E, I, L, Z] = {
def pull(
push: Option[Chunk[I]] => ZIO[R, (Either[E, Z], Chunk[L]), Unit]
): ZChannel[R, ZNothing, Chunk[I], Any, E, Chunk[L], Z] =
ZChannel.readWithCause(
in =>
ZChannel
.fromZIO(push(Some(in)))
.foldChannel(
{
case (Left(e), leftovers) =>
ZChannel.write(leftovers) *> ZChannel.fail(e)
case (Right(z), leftovers) =>
ZChannel.write(leftovers) *> ZChannel.succeedNow(z)
},
_ => pull(push)
),
err => ZChannel.refailCause(err),
_ =>
ZChannel
.fromZIO(push(None))
.foldChannel(
{
case (Left(e), leftovers) =>
ZChannel.write(leftovers) *> ZChannel.fail(e)
case (Right(z), leftovers) =>
ZChannel.write(leftovers) *> ZChannel.succeedNow(z)
},
_ => ZChannel.fromZIO(ZIO.dieMessage("empty sink"))
)
)
new ZSink(ZChannel.unwrapScoped[R](push.map(pull)))
}
/**
* Creates a single-value sink produced from an effect
*/
def fromZIO[R, E, Z](b: => ZIO[R, E, Z])(implicit trace: Trace): ZSink[R, E, Any, Nothing, Z] =
new ZSink(ZChannel.fromZIO(b))
/**
* Create a sink which enqueues each element into the specified queue.
*/
def fromQueue[I](queue: => Enqueue[I])(implicit trace: Trace): ZSink[Any, Nothing, I, Nothing, Unit] =
ZSink.unwrap(ZIO.succeed(queue).map(queue => foreachChunk(queue.offerAll)))
/**
* Create a sink which enqueues each element into the specified queue. The
* queue will be shutdown once the stream is closed.
*/
def fromQueueWithShutdown[I](queue: => Enqueue[I])(implicit
trace: Trace
): ZSink[Any, Nothing, I, Nothing, Unit] =
ZSink.unwrapScoped(
ZIO.acquireRelease(ZIO.succeed(queue))(_.shutdown).map(fromQueue[I](_))
)
/**
* Create a sink which publishes each element to the specified hub.
*/
def fromHub[I](hub: => Hub[I])(implicit
trace: Trace
): ZSink[Any, Nothing, I, Nothing, Unit] =
fromQueue(hub)
/**
* Create a sink which publishes each element to the specified hub. The hub
* will be shutdown once the stream is closed.
*/
def fromHubWithShutdown[I](hub: => Hub[I])(implicit
trace: Trace
): ZSink[Any, Nothing, I, Nothing, Unit] =
fromQueueWithShutdown(hub)
/**
* Creates a sink containing the first value.
*/
def head[In](implicit trace: Trace): ZSink[Any, Nothing, In, In, Option[In]] =
fold(None: Option[In])(_.isEmpty) {
case (s @ Some(_), _) => s
case (None, in) => Some(in)
}
/**
* Creates a sink containing the last value.
*/
def last[In](implicit trace: Trace): ZSink[Any, Nothing, In, In, Option[In]] =
foldLeftChunks[In, Option[In]](None)((s, in) => in.lastOption.orElse(s))
/**
* Creates a sink that does not consume any input but provides the given chunk
* as its leftovers
*/
def leftover[L](c: => Chunk[L])(implicit trace: Trace): ZSink[Any, Nothing, Any, L, Unit] =
new ZSink(ZChannel.suspend(ZChannel.write(c)))
/**
* Logs the specified message at the current log level.
*/
def log(message: => String)(implicit trace: Trace): ZSink[Any, Nothing, Any, Nothing, Unit] =
ZSink.fromZIO(ZIO.log(message))
/**
* Annotates each log in streams composed after this with the specified log
* annotation.
*/
def logAnnotate[R, E, In, L, Z](key: => String, value: => String)(sink: ZSink[R, E, In, L, Z])(implicit
trace: Trace
): ZSink[R, E, In, L, Z] =
logAnnotate(LogAnnotation(key, value))(sink)
/**
* Annotates each log in streams composed after this with the specified log
* annotation.
*/
def logAnnotate[R, E, In, L, Z](annotation: => LogAnnotation, annotations: LogAnnotation*)(
sink: ZSink[R, E, In, L, Z]
)(implicit
trace: Trace
): ZSink[R, E, In, L, Z] =
logAnnotate(Set(annotation) ++ annotations.toSet)(sink)
/**
* Annotates each log in streams composed after this with the specified log
* annotation.
*/
def logAnnotate[R, E, In, L, Z](annotations: => Set[LogAnnotation])(sink: ZSink[R, E, In, L, Z])(implicit
trace: Trace
): ZSink[R, E, In, L, Z] =
ZSink.unwrapScoped(ZIO.logAnnotateScoped(annotations).as(sink))
/**
* Retrieves the log annotations associated with the current scope.
*/
def logAnnotations(implicit trace: Trace): ZSink[Any, Nothing, Any, Nothing, Map[String, String]] =
ZSink.fromZIO(FiberRef.currentLogAnnotations.get)
/**
* Logs the specified message at the debug log level.
*/
def logDebug(message: => String)(implicit trace: Trace): ZSink[Any, Nothing, Any, Nothing, Unit] =
ZSink.fromZIO(ZIO.logDebug(message))
/**
* Logs the specified message at the error log level.
*/
def logError(message: => String)(implicit trace: Trace): ZSink[Any, Nothing, Any, Nothing, Unit] =
ZSink.fromZIO(ZIO.logError(message))
/**
* Logs the specified cause as an error.
*/
def logErrorCause(cause: => Cause[Any])(implicit trace: Trace): ZSink[Any, Nothing, Any, Nothing, Unit] =
ZSink.fromZIO(ZIO.logErrorCause(cause))
/**
* Logs the specified message at the fatal log level.
*/
def logFatal(message: => String)(implicit trace: Trace): ZSink[Any, Nothing, Any, Nothing, Unit] =
ZSink.fromZIO(ZIO.logFatal(message))
/**
* Logs the specified message at the informational log level.
*/
def logInfo(message: => String)(implicit trace: Trace): ZSink[Any, Nothing, Any, Nothing, Unit] =
ZSink.fromZIO(ZIO.logInfo(message))
/**
* Sets the log level for streams composed after this.
*/
def logLevel[R, E, In, L, Z](level: LogLevel)(sink: ZSink[R, E, In, L, Z])(implicit
trace: Trace
): ZSink[R, E, In, L, Z] =
ZSink.unwrapScoped(ZIO.logLevelScoped(level).as(sink))
/**
* Adjusts the label for the logging span for streams composed after this.
*/
def logSpan[R, E, In, L, Z](label: => String)(sink: ZSink[R, E, In, L, Z])(implicit
trace: Trace
): ZSink[R, E, In, L, Z] =
ZSink.unwrapScoped(ZIO.logSpanScoped(label).as(sink))
/**
* Logs the specified message at the trace log level.
*/
def logTrace(message: => String)(implicit trace: Trace): ZSink[Any, Nothing, Any, Nothing, Unit] =
ZSink.fromZIO(ZIO.logTrace(message))
/**
* Logs the specified message at the warning log level.
*/
def logWarning(message: => String)(implicit trace: Trace): ZSink[Any, Nothing, Any, Nothing, Unit] =
ZSink.fromZIO(ZIO.logWarning(message))
def mkString(implicit trace: Trace): ZSink[Any, Nothing, Any, Nothing, String] =
ZSink.suspend {
val builder = new StringBuilder()
foldLeftChunks[Any, Unit](())((_, els: Chunk[Any]) => els.foreach(el => builder.append(el.toString))).map(_ =>
builder.result()
)
}
def never(implicit trace: Trace): ZSink[Any, Nothing, Any, Nothing, Nothing] =
ZSink.fromZIO(ZIO.never)
/**
* Accesses the specified service in the environment of the effect.
*/
def service[Z: Tag](implicit trace: Trace): ZSink[Z, Nothing, Any, Nothing, Z] =
ZSink.serviceWith(identity)
/**
* Accesses the service corresponding to the specified key in the environment.
*/
def serviceAt[Service]: ZStream.ServiceAtPartiallyApplied[Service] =
new ZStream.ServiceAtPartiallyApplied[Service]
/**
* Accesses the specified service in the environment of the sink.
*/
def serviceWith[Service]: ServiceWithPartiallyApplied[Service] =
new ServiceWithPartiallyApplied[Service]
/**
* Accesses the specified service in the environment of the sink in the
* context of an effect.
*/
def serviceWithZIO[Service]: ServiceWithZIOPartiallyApplied[Service] =
new ServiceWithZIOPartiallyApplied[Service]
/**
* Accesses the specified service in the environment of the sink in the
* context of a sink.
*/
def serviceWithSink[Service]: ServiceWithSinkPartiallyApplied[Service] =
new ServiceWithSinkPartiallyApplied[Service]
/**
* A sink that immediately ends with the specified value.
*/
def succeed[Z](z: => Z)(implicit trace: Trace): ZSink[Any, Nothing, Any, Nothing, Z] =
new ZSink(ZChannel.succeed(z))
/**
* Returns a lazily constructed sink that may require effects for its
* creation.
*/
def suspend[Env, E, In, Leftover, Done](
sink: => ZSink[Env, E, In, Leftover, Done]
)(implicit trace: Trace): ZSink[Env, E, In, Leftover, Done] =
new ZSink(ZChannel.suspend(sink.channel))
/**
* A sink that sums incoming numeric values.
*/
def sum[A](implicit A: Numeric[A], trace: Trace): ZSink[Any, Nothing, A, Nothing, A] =
foldLeftChunks(A.zero)((acc, chunk) => A.plus(acc, chunk.sum))
/**
* Tags each metric in this sink with the specific tag.
*/
def tagged[R, E, In, L, Z](key: => String, value: => String)(sink: ZSink[R, E, In, L, Z])(implicit
trace: Trace
): ZSink[R, E, In, L, Z] =
tagged(Set(MetricLabel(key, value)))(sink)
/**
* Tags each metric in this sink with the specific tag.
*/
def tagged[R, E, In, L, Z](tag: => MetricLabel, tags: MetricLabel*)(sink: ZSink[R, E, In, L, Z])(implicit
trace: Trace
): ZSink[R, E, In, L, Z] =
tagged(Set(tag) ++ tags.toSet)(sink)
/**
* Tags each metric in this sink with the specific tag.
*/
def tagged[R, E, In, L, Z](tags: => Set[MetricLabel])(sink: ZSink[R, E, In, L, Z])(implicit
trace: Trace
): ZSink[R, E, In, L, Z] =
ZSink.unwrapScoped(ZIO.taggedScoped(tags).as(sink))
/**
* Retrieves the metric tags associated with the current scope.
*/
def tags(implicit trace: Trace): ZSink[Any, Nothing, Any, Nothing, Set[MetricLabel]] =
ZSink.fromZIO(ZIO.tags)
/**
* A sink that takes the specified number of values.
*/
def take[In](n: Int)(implicit trace: Trace): ZSink[Any, Nothing, In, In, Chunk[In]] =
ZSink.unwrap {
ZIO.succeed(n).map { n =>
ZSink.foldChunks[In, Chunk[In]](Chunk.empty)(_.length < n)(_ ++ _).flatMap { acc =>
val (taken, leftover) = acc.splitAt(n)
new ZSink(
ZChannel.write(leftover) *> ZChannel.succeedNow(taken)
)
}
}
}
def timed(implicit trace: Trace): ZSink[Any, Nothing, Any, Nothing, Duration] =
ZSink.drain.timed.map(_._2)
/**
* Creates a sink produced from an effect.
*/
def unwrap[R, E, In, L, Z](
zio: => ZIO[R, E, ZSink[R, E, In, L, Z]]
)(implicit trace: Trace): ZSink[R, E, In, L, Z] =
new ZSink(ZChannel.unwrap(zio.map(_.channel)))
/**
* Creates a sink produced from a scoped effect.
*/
def unwrapScoped[R]: UnwrapScopedPartiallyApplied[R] =
new UnwrapScopedPartiallyApplied[R]
/**
* Creates a sink produced from a scoped effect.
*/
def unwrapScopedWith[R, E, In, L, Z](
f: Scope => ZIO[R, E, ZSink[R, E, In, L, Z]]
)(implicit trace: Trace): ZSink[R, E, In, L, Z] =
new ZSink(ZChannel.unwrapScopedWith(scope => f(scope).map(_.channel)))
final class EnvironmentWithPartiallyApplied[R](private val dummy: Boolean = true) extends AnyVal {
def apply[Z](
f: ZEnvironment[R] => Z
)(implicit trace: Trace): ZSink[R, Nothing, Any, Nothing, Z] =
ZSink.environment[R].map(f)
}
final class EnvironmentWithZIOPartiallyApplied[R](private val dummy: Boolean = true) extends AnyVal {
def apply[R1 <: R, E, Z](
f: ZEnvironment[R] => ZIO[R1, E, Z]
)(implicit trace: Trace): ZSink[R with R1, E, Any, Nothing, Z] =
ZSink.environment[R].mapZIO(f)
}
final class EnvironmentWithSinkPartiallyApplied[R](private val dummy: Boolean = true) extends AnyVal {
def apply[R1 <: R, E, In, L, Z](
f: ZEnvironment[R] => ZSink[R1, E, In, L, Z]
)(implicit trace: Trace): ZSink[R with R1, E, In, L, Z] =
new ZSink(ZChannel.unwrap(ZIO.environmentWith[R](f(_).channel)))
}
final class ServiceAtPartiallyApplied[Service](private val dummy: Boolean = true) extends AnyVal {
def apply[Key](
key: => Key
)(implicit
tag: EnvironmentTag[Map[Key, Service]],
trace: Trace
): ZSink[Map[Key, Service], Nothing, Any, Nothing, Option[Service]] =
ZSink.environmentWith(_.getAt(key))
}
final class ServiceWithPartiallyApplied[Service](private val dummy: Boolean = true) extends AnyVal {
def apply[Z](f: Service => Z)(implicit
tag: Tag[Service],
trace: Trace
): ZSink[Service, Nothing, Any, Nothing, Z] =
ZSink.fromZIO(ZIO.serviceWith[Service](f))
}
final class ServiceWithZIOPartiallyApplied[Service](private val dummy: Boolean = true) extends AnyVal {
def apply[R <: Service, E, Z](f: Service => ZIO[R, E, Z])(implicit
tag: Tag[Service],
trace: Trace
): ZSink[R with Service, E, Any, Nothing, Z] =
ZSink.fromZIO(ZIO.serviceWithZIO[Service](f))
}
final class ServiceWithSinkPartiallyApplied[Service](private val dummy: Boolean = true) extends AnyVal {
def apply[R <: Service, E, In, L, Z](f: Service => ZSink[R, E, In, L, Z])(implicit
tag: Tag[Service],
trace: Trace
): ZSink[R with Service, E, In, L, Z] =
new ZSink(ZChannel.unwrap(ZIO.serviceWith[Service](f(_).channel)))
}
final class UnwrapScopedPartiallyApplied[R](private val dummy: Boolean = true) extends AnyVal {
def apply[E, In, L, Z](scoped: => ZIO[Scope with R, E, ZSink[R, E, In, L, Z]])(implicit
trace: Trace
): ZSink[R, E, In, L, Z] =
new ZSink(ZChannel.unwrapScoped[R](scoped.map(_.channel)))
}
final class ProvideSomeLayer[R0, -R, +E, -In, +L, +Z](
private val channel: ZChannel[R, ZNothing, Chunk[In], Any, E, Chunk[L], Z]
) extends AnyVal {
def apply[E1 >: E, R1](
layer: => ZLayer[R0, E1, R1]
)(implicit
ev: R0 with R1 <:< R,
tagged: EnvironmentTag[R1],
trace: Trace
): ZSink[R0, E1, In, L, Z] =
new ZSink(
channel
.asInstanceOf[ZChannel[R0 with R1, ZNothing, Chunk[In], Any, E, Chunk[L], Z]]
.provideLayer(ZLayer.environment[R0] ++ layer)
)
}
}
