chore: prepare v2.1.5

package.json

@@ -1,12 +1,13 @@
 {
   "name": "purescript-node-stream-pipes",
-  "version": "v1.6.0",
+  "version": "v2.1.5",
   "type": "module",
   "dependencies": {
-    "csv-parse": "^5.5.5",
+    "csv-parse": "^5.5.6",
-    "csv-stringify": "^6.4.6"
+    "csv-stringify": "^6.5.0"
   },
   "devDependencies": {
+    "cbor-x": "^1.5.9",
     "typescript": "^5.4.5"
   }
 }

spago.lock

@@ -5,20 +5,26 @@ workspace:
       dependencies:
         - aff: ">=7.1.0 <8.0.0"
         - arrays: ">=7.3.0 <8.0.0"
+        - console: ">=6.1.0 <7.0.0"
+        - control: ">=6.0.0 <7.0.0"
+        - datetime: ">=6.1.0 <7.0.0"
         - effect: ">=4.0.0 <5.0.0"
         - either: ">=6.1.0 <7.0.0"
         - exceptions: ">=6.0.0 <7.0.0"
         - foldable-traversable: ">=6.0.0 <7.0.0"
         - foreign-object: ">=4.1.0 <5.0.0"
+        - fork: ">=6.0.0 <7.0.0"
         - lists: ">=7.0.0 <8.0.0"
         - maybe: ">=6.0.0 <7.0.0"
         - mmorph: ">=7.0.0 <8.0.0"
+        - newtype: ">=5.0.0 <6.0.0"
         - node-buffer: ">=9.0.0 <10.0.0"
         - node-event-emitter: ">=3.0.0 <4.0.0"
-        - node-fs: ">=9.1.0 <10.0.0"
+        - node-fs: ">=9.1.0 <9.2.0"
         - node-path: ">=5.0.0 <6.0.0"
         - node-streams: ">=9.0.0 <10.0.0"
         - node-zlib: ">=0.4.0 <0.5.0"
+        - now: ">=6.0.0 <7.0.0"
         - ordered-collections: ">=3.2.0 <4.0.0"
         - parallel: ">=6.0.0 <7.0.0"
         - pipes: ">=8.0.0 <9.0.0"
@@ -296,8 +302,8 @@ packages:
       - unfoldable
   exceptions:
     type: registry
-    version: 6.0.0
+    version: 6.1.0
-    integrity: sha256-y/xTAEIZIARCE+50/u1di0ncebJ+CIwNOLswyOWzMTw=
+    integrity: sha256-K0T89IHtF3vBY7eSAO7eDOqSb2J9kZGAcDN5+IKsF8E=
     dependencies:
       - effect
       - either
@@ -861,8 +867,8 @@ packages:
       - refs
   transformers:
     type: registry
-    version: 6.0.0
+    version: 6.1.0
-    integrity: sha256-Pzw40HjthX77tdPAYzjx43LK3X5Bb7ZspYAp27wksFA=
+    integrity: sha256-3Bm+Z6tsC/paG888XkywDngJ2JMos+JfOhRlkVfb7gI=
     dependencies:
       - control
       - distributive
@@ -875,6 +881,7 @@ packages:
       - maybe
       - newtype
       - prelude
+      - st
       - tailrec
       - tuples
       - unfoldable

spago.yaml

@@ -1,7 +1,7 @@
 package:
   name: node-stream-pipes
   publish:
-    version: '1.6.0'
+    version: '2.1.5'
     license: 'GPL-3.0-or-later'
     location:
       githubOwner: 'cakekindel'
@@ -12,20 +12,26 @@ package:
   dependencies:
     - aff: ">=7.1.0 <8.0.0"
     - arrays: ">=7.3.0 <8.0.0"
+    - console: ">=6.1.0 <7.0.0"
+    - control: ">=6.0.0 <7.0.0"
+    - datetime: ">=6.1.0 <7.0.0"
     - effect: ">=4.0.0 <5.0.0"
     - either: ">=6.1.0 <7.0.0"
     - exceptions: ">=6.0.0 <7.0.0"
     - foldable-traversable: ">=6.0.0 <7.0.0"
     - foreign-object: ">=4.1.0 <5.0.0"
+    - fork: ">=6.0.0 <7.0.0"
     - lists: ">=7.0.0 <8.0.0"
     - maybe: ">=6.0.0 <7.0.0"
     - mmorph: ">=7.0.0 <8.0.0"
+    - newtype: ">=5.0.0 <6.0.0"
     - node-buffer: ">=9.0.0 <10.0.0"
     - node-event-emitter: ">=3.0.0 <4.0.0"
-    - node-fs: ">=9.1.0 <10.0.0"
+    - node-fs: ">=9.1.0 <9.2.0"
     - node-path: ">=5.0.0 <6.0.0"
     - node-streams: ">=9.0.0 <10.0.0"
     - node-zlib: ">=0.4.0 <0.5.0"
+    - now: ">=6.0.0 <7.0.0"
     - ordered-collections: ">=3.2.0 <4.0.0"
     - parallel: ">=6.0.0 <7.0.0"
     - pipes: ">=8.0.0 <9.0.0"

src/Node.Stream.Object.purs

@@ -172,9 +172,10 @@ unsafeFromStringWritable :: forall r. Stream.Writable r -> Writable String
 unsafeFromStringWritable = unsafeCoerce
 
 awaitReadableOrClosed :: forall s a. Read s a => s -> Aff Unit
-awaitReadableOrClosed s = do
+awaitReadableOrClosed s = Aff.supervise do
   fiber <-
-    Aff.forkAff $ parOneOf
+    Aff.forkAff
+    $ parOneOf
       [ onceAff0 readableH s $> Right unit
       , onceAff0 closeH s $> Right unit
       , Left <$> onceAff1 errorH s
@@ -189,14 +190,20 @@ awaitReadableOrClosed s = do
     Aff.killFiber (error "") fiber
 
 awaitFinished :: forall s a. Write s a => s -> Aff Unit
-awaitFinished s = do
+awaitFinished s = Aff.supervise do
   fiber <- Aff.forkAff $ onceAff0 finishH s
   finished <- liftEffect $ isWritableFinished s
   if not finished then Aff.joinFiber fiber else Aff.killFiber (error "") fiber
 
 awaitWritableOrClosed :: forall s a. Write s a => s -> Aff Unit
-awaitWritableOrClosed s = do
+awaitWritableOrClosed s = Aff.supervise do
-  fiber <- Aff.forkAff $ parOneOf [ onceAff0 drainH s $> Right unit, onceAff0 closeH s $> Right unit, Left <$> onceAff1 errorH s ]
+  fiber <-
+    Aff.forkAff
+    $ parOneOf
+        [ onceAff0 drainH s $> Right unit
+        , onceAff0 closeH s $> Right unit
+        , Left <$> onceAff1 errorH s
+        ]
   closed <- liftEffect $ isClosed s
   writeEnded <- liftEffect $ isWritableEnded s
   writable <- liftEffect $ isWritable s

src/Pipes.Async.purs

@@ -0,0 +1,368 @@
+module Pipes.Async where
+
+import Prelude hiding (join)
+
+import Control.Alternative (class Alternative, empty, guard)
+import Control.Monad.Cont (class MonadTrans)
+import Control.Monad.Error.Class (class MonadError, class MonadThrow, catchError, throwError)
+import Control.Monad.Except (ExceptT, runExceptT)
+import Control.Monad.Fork.Class (class MonadBracket, class MonadFork, fork)
+import Control.Monad.Maybe.Trans (MaybeT(..), runMaybeT)
+import Control.Monad.Morph (class MFunctor, hoist)
+import Control.Monad.Rec.Class (class MonadRec, Step(..), tailRecM)
+import Control.Monad.ST.Class (liftST)
+import Control.Monad.ST.Ref (STRef)
+import Control.Monad.ST.Ref as ST.Ref
+import Control.Monad.Trans.Class (lift)
+import Control.Parallel (class Parallel, parOneOf)
+import Data.Array as Array
+import Data.DateTime.Instant as Instant
+import Data.Either (Either(..), either)
+import Data.Foldable (class Foldable, fold)
+import Data.Generic.Rep (class Generic)
+import Data.Maybe (Maybe(..), fromMaybe, isNothing)
+import Data.Newtype (unwrap)
+import Data.Show.Generic (genericShow)
+import Data.Time.Duration (Milliseconds)
+import Data.Traversable (class Traversable, traverse, traverse_)
+import Data.Tuple.Nested (type (/\), (/\))
+import Effect.Aff.Class (class MonadAff, liftAff)
+import Effect.Class (class MonadEffect, liftEffect)
+import Effect.Console (log)
+import Effect.Now as Now
+import Pipes (await, yield)
+import Pipes.Collect as Collect
+import Pipes.Core (Pipe, Proxy, Producer)
+
+data WriteSignal
+  = WriteSignalOk
+  | WriteSignalEnded
+
+derive instance Generic WriteSignal _
+derive instance Eq WriteSignal
+derive instance Ord WriteSignal
+instance Show WriteSignal where show = genericShow
+
+instance Discard WriteSignal where
+  discard = bind
+
+data ReadSignal
+  = ReadSignalOk
+  | ReadSignalEnded
+
+derive instance Generic ReadSignal _
+derive instance Eq ReadSignal
+derive instance Ord ReadSignal
+instance Show ReadSignal where show = genericShow
+
+instance Discard ReadSignal where
+  discard = bind
+
+data WriteResult
+  = WriteAgain
+  | WriteNeedsDrain
+  | WriteEnded
+
+derive instance Generic WriteResult _
+derive instance Eq WriteResult
+derive instance Ord WriteResult
+instance Show WriteResult where show = genericShow
+
+data ReadResult a
+  = ReadOk a
+  | ReadWouldBlock
+
+derive instance Generic (ReadResult a) _
+derive instance Eq a => Eq (ReadResult a)
+derive instance Ord a => Ord (ReadResult a)
+derive instance Functor ReadResult
+derive instance Foldable ReadResult
+derive instance Traversable ReadResult
+instance Show a => Show (ReadResult a) where show = genericShow
+
+type AsyncIO a b m r =
+  { write :: a -> m WriteResult
+  , read :: m (ReadResult b)
+  , awaitWrite :: m WriteSignal
+  , awaitRead :: m ReadSignal
+  }
+  /\ AsyncPipe a b m r
+
+-- | An `AsyncPipe` is a `Pipe`-like struct that allows
+-- | concurrently reading from a `Producer` and writing to a `Consumer`.
+-- |
+-- | An implementation of `AsyncPipe` for Node `Transform` streams
+-- | is provided in `Pipes.Node.Stream`.
+data AsyncPipe a b m r
+  -- | A pure return value
+  = Pure r
+  -- | An `AsyncPipe` behind a computation
+  | M (m (AsyncPipe a b m r))
+  -- | Interface to write & read from the backing resource
+  | AsyncIO (AsyncIO a b m r)
+
+-- | Modify request / response types
+mapIO :: forall aa ab ba bb m r. Monad m => (ab -> aa) -> (ba -> bb) -> AsyncPipe aa ba m r -> AsyncPipe ab bb m r
+mapIO _ _ (Pure a) = Pure a
+mapIO a b (M m) = M $ mapIO a b <$> m
+mapIO a b (AsyncIO ({write, awaitWrite, read, awaitRead} /\ m)) =
+  AsyncIO $ {write: write <<< a, awaitWrite, read: map b <$> read, awaitRead} /\ mapIO a b m
+
+-- | Modify request / response types
+bindIO :: forall aa ab ba bb m r. Monad m => (ab -> m aa) -> (ba -> m bb) -> AsyncPipe aa ba m r -> AsyncPipe ab bb m r
+bindIO _ _ (Pure a) = Pure a
+bindIO a b (M m) = M $ bindIO a b <$> m
+bindIO a b (AsyncIO ({write, awaitWrite, read, awaitRead} /\ m)) =
+  AsyncIO $ {write: flip bind write <<< a, awaitWrite, read: traverse b =<< read, awaitRead} /\ bindIO a b m
+
+-- | Remove the `AsyncPipe` wrapper by discarding the IO
+stripIO :: forall a b m r. Monad m => AsyncPipe a b m r -> m r
+stripIO (Pure r) = pure r
+stripIO (M m) = m >>= stripIO
+stripIO (AsyncIO (_ /\ m)) = stripIO m
+
+-- | Execute the `AsyncPipe` monad stack until `AsyncIO` is reached (if any)
+getAsyncIO :: forall a b m r. Monad m => AsyncPipe a b m r -> m (Maybe (AsyncIO a b m r))
+getAsyncIO (AsyncIO a) = pure $ Just a
+getAsyncIO (M m) = m >>= getAsyncIO
+getAsyncIO (Pure _) = pure Nothing
+
+instance MonadTrans (AsyncPipe a b) where
+  lift = M <<< map Pure
+
+instance MFunctor (AsyncPipe a b) where
+  hoist _ (Pure a) = Pure a
+  hoist f (M m) = M $ f $ hoist f <$> m
+  hoist f (AsyncIO ({read, write, awaitWrite, awaitRead} /\ m)) =
+    AsyncIO
+      $ { read: f read
+        , write: f <<< write
+        , awaitWrite: f awaitWrite
+        , awaitRead: f awaitRead
+        }
+        /\ hoist f m
+
+instance Monad m => Functor (AsyncPipe a b m) where
+  map f (Pure r) = Pure $ f r
+  map f (M m) = M $ map f <$> m
+  map f (AsyncIO (io /\ m)) = AsyncIO $ io /\ (f <$> m)
+
+instance Monad m => Apply (AsyncPipe a b m) where
+  apply (Pure f) ma = f <$> ma
+  apply (M mf) ma = M $ (_ <*> ma) <$> mf
+  apply (AsyncIO (io /\ mf)) ma = AsyncIO $ io /\ (mf <*> ma)
+
+instance Monad m => Applicative (AsyncPipe a b m) where
+  pure = Pure
+
+instance Monad m => Bind (AsyncPipe a b m) where
+  bind (Pure a) f = f a
+  bind (M ma) f = M $ (_ >>= f) <$> ma
+  bind (AsyncIO (io /\ m)) f = AsyncIO $ io /\ (m >>= f)
+
+instance Monad m => Monad (AsyncPipe a b m)
+
+instance MonadThrow e m => MonadThrow e (AsyncPipe a b m) where
+  throwError = lift <<< throwError
+
+instance MonadError e m => MonadError e (AsyncPipe a b m) where
+  catchError m f = lift $ catchError (stripIO m) (stripIO <<< f)
+
+instance MonadEffect m => MonadEffect (AsyncPipe a b m) where
+  liftEffect = lift <<< liftEffect
+
+instance MonadAff m => MonadAff (AsyncPipe a b m) where
+  liftAff = lift <<< liftAff
+
+-- | Wraps all fields of an `AsyncPipe` with logging to debug
+-- | behavior and timing.
+debug :: forall a b m r. MonadAff m => String -> AsyncPipe (Maybe a) (Maybe b) m r -> AsyncPipe (Maybe a) (Maybe b) m r
+debug c m =
+  let
+    logL :: forall m'. MonadEffect m' => _ -> m' Unit
+    logL msg = liftEffect $ log $ "[" <> c <> "] " <> msg
+    logR :: forall m'. MonadEffect m' => _ -> m' Unit
+    logR msg = liftEffect $ log $ "[" <> c <> "] " <> fold (Array.replicate 20 " ") <> msg
+
+    time :: forall m' a'. MonadEffect m' => m' a' -> m' (Milliseconds /\ a')
+    time ma = do
+      start <- liftEffect Now.now
+      a <- ma
+      end <- liftEffect Now.now
+      pure $ (end `Instant.diff` start) /\ a
+  in
+    flip bind (fromMaybe m)
+    $ runMaybeT do
+      (io /\ done') <- MaybeT $ lift $ getAsyncIO m
+      let
+        write a = do
+          logL "write >"
+          elapsed /\ w <- time $ io.write a
+          logL $ "< write " <> show w <> " (" <> show (unwrap elapsed) <> "ms)"
+          pure w
+
+        read = do
+          logR "read >"
+          elapsed /\ r <- time $ io.read
+          logR $ "< read " <> show (map (const unit) <$> r) <> " (" <> show (unwrap elapsed) <> "ms)"
+          pure r
+
+        awaitWrite = do
+          logL "awaitWrite >"
+          elapsed /\ w <- time $ io.awaitWrite
+          logL $ "< awaitWrite " <> show w <> " (" <> show (unwrap elapsed) <> "ms)"
+          pure w
+
+        awaitRead = do
+          logR "awaitRead >"
+          elapsed /\ r <- time $ io.awaitRead
+          logR $ "< awaitRead " <> show r <> " (" <> show (unwrap elapsed) <> "ms)"
+          pure r
+
+        done = do
+          logL "done >"
+          elapsed /\ r <- time done'
+          logL $ "< done (" <> show (unwrap elapsed) <> "ms)"
+          pure r
+      pure $ AsyncIO $ {write, read, awaitWrite, awaitRead} /\ done
+
+-- | Convert an `AsyncPipe` to a regular `Pipe`.
+-- |
+-- | Rather than two concurrently-running halves (producer & consumer),
+-- | this requires the `AsyncPipe` to occasionally stop `await`ing data
+-- | written by the upstream `Producer` so that it can `yield` to the downstream `Consumer`.
+-- |
+-- | This implementation chooses to prioritize `yield`ing data to the `Consumer` over
+-- | `await`ing written chunks.
+-- |
+-- | Note that using this limits the potential parallelism of the entire pipeline, ex:
+-- |
+-- | ```purs
+-- | Pipe.FS.read "foo.csv"        -- read
+-- |   >-> sync Pipe.CSV.parse     -- parse
+-- |   >-> sync Pipe.CBOR.encode   -- encode
+-- |   >-> Pipe.FS.write "foo.bin" -- write
+-- | ```
+-- |
+-- | In the above example, this is what happens when the pipeline
+-- | is executed:
+-- | 1. `write` asks `encode` "do you have any data yet?" (fast)
+-- | 1. `encode` asks `parse` "do you have any data yet?" (fast)
+-- | 1. `parse` asks `read` "do you have any data yet?" (fast)
+-- | 1. `read` passes 1 chunk to `parse` (fast)
+-- | 1. `parse` blocks until the chunk is parsed (slow)
+-- | 1. `parse` passes 1 chunk to `encode` (fast)
+-- | 1. `encode` blocks until the chunk is encoded (slow)
+-- | 1. `write` writes the block (fast)
+-- |
+-- | For larger workloads, changing this to use `asyncPipe` would be preferable, ex:
+-- | ```purs
+-- | Pipe.FS.read "foo.csv"        -- read
+-- |   >-/-> Pipe.CSV.parse        -- parse
+-- |   >-/-> Pipe.CBOR.encode      -- encode
+-- |   >-> Pipe.FS.write "foo.bin" -- write
+-- | ```
+-- |
+-- | With this change:
+-- | * `read` will pass chunks to `parse` as fast as `parse` allows
+-- | * `parse` will parse chunks and yield them to `encode` as soon as they're ready
+-- | * `encode` will encode chunks and yield them to `write` as soon as they're ready
+sync :: forall a b f p e m r. MonadError e m => Alternative p => Parallel p m => MonadFork f m => MonadAff m => AsyncPipe (Maybe a) (Maybe b) m r -> Pipe (Maybe a) (Maybe b) m r
+sync m =
+  let
+    liftPipe :: forall r'. (Proxy _ _ _ _ m) r' -> ExceptT (Step _ _) (Proxy _ _ _ _ m) r'
+    liftPipe = lift
+
+    liftM :: forall r'. m r' -> ExceptT (Step _ _) (Proxy _ _ _ _ m) r'
+    liftM = liftPipe <<< lift
+  in
+  lift (getAsyncIO m) >>=
+    case _ of
+      Nothing -> lift $ stripIO m
+      Just ({write, awaitWrite, read, awaitRead} /\ done) ->
+         let
+           awaitRW onR onW =
+             liftM (parOneOf [Right <$> awaitWrite, Left <$> awaitRead])
+             >>= either (const onR) onW
+
+           wSignal WriteSignalOk = WriteAgain
+           wSignal WriteSignalEnded = WriteEnded
+
+           tailRecEarly f a = tailRecM (map (either identity identity) <<< runExceptT <<< f) a
+           continue a = throwError (Loop a)
+           break = (Done <$> liftM (stripIO done)) >>= throwError
+         in do
+           flip tailRecEarly WriteAgain \writable -> do
+             rb <- liftM read
+             case rb of
+               ReadWouldBlock
+                 | writable == WriteEnded -> liftM awaitRead *> continue writable
+                 | writable == WriteNeedsDrain -> awaitRW (continue writable) (continue <<< wSignal)
+                 | otherwise -> pure unit
+               ReadOk (Just b) -> liftPipe (yield $ Just b) *> continue writable
+               ReadOk Nothing -> liftPipe (yield Nothing) *> break
+
+             when (writable /= WriteAgain) $ continue writable
+
+             a <- liftPipe await
+             writable' <- liftM $ write a
+             when (isNothing a) $ continue WriteEnded
+             pure $ Loop writable'
+
+-- | Implementation of `(>-/->)`
+-- |
+-- | In the current `MonadFork` "thread", read data from the `AsyncPipe` as it
+-- | is yielded and `yield` to the downstream `Consumer`.
+-- |
+-- | Concurrently, in a separate thread, read data from the upstream `Producer`
+-- | and write to the `AsyncPipe` at max throughput.
+-- |
+-- | If the producing half fails, the error is caught and rethrown.
+-- |
+-- | If the consuming half fails, the error is caught, the producing half is killed, and the error is rethrown.
+pipeAsync
+  :: forall e f m a b
+   . MonadRec m
+  => MonadAff m
+  => MonadBracket e f m
+  => Producer (Maybe a) m Unit
+  -> AsyncPipe (Maybe a) (Maybe b) m Unit
+  -> Producer (Maybe b) m Unit
+pipeAsync prod m =
+  lift (getAsyncIO m)
+    >>= case _ of
+          Nothing -> pure unit
+          Just ({write, read, awaitWrite, awaitRead} /\ done) -> do
+            errST :: STRef _ (Maybe e) <- lift $ liftEffect $ liftST $ ST.Ref.new Nothing
+            killST :: STRef _ Boolean <- lift $ liftEffect $ liftST $ ST.Ref.new false
+
+            let
+              killThread = void $ liftEffect $ liftST $ ST.Ref.write true killST
+              threadKilled = liftEffect $ liftST $ ST.Ref.read killST
+              putThreadError = void <<< liftEffect <<< liftST <<< flip ST.Ref.write errST <<< Just
+              getThreadError = liftEffect $ liftST $ ST.Ref.read errST
+
+              rx a = do
+                killed <- threadKilled
+                guard $ not killed
+                w <- lift $ write a
+                case w of
+                  WriteNeedsDrain -> lift $ void awaitWrite
+                  WriteEnded -> empty
+                  WriteAgain -> pure unit
+
+              spawn = lift <<< fork <<< flip catchError putThreadError
+
+            _thread <- spawn $ void $ runMaybeT $ Collect.foreach rx (hoist lift prod)
+
+            flip tailRecM unit $ const do
+              getThreadError >>= traverse_ throwError
+              rb <- lift read
+              case rb of
+                ReadOk (Just b) -> yield (Just b) $> Loop unit
+                ReadOk Nothing -> killThread *> yield Nothing $> Done unit
+                ReadWouldBlock -> void (lift awaitRead) $> Loop unit
+
+            lift $ stripIO done
+
+infixl 7 pipeAsync as >-/->

src/Pipes.Collect.purs

@@ -31,12 +31,8 @@ traverse :: forall a b m. MonadRec m => (b -> a -> m b) -> b -> Producer a m Uni
 traverse f b0 p0 =
   flip tailRecM (p0 /\ b0) \(p /\ b) ->
     case p of
-      Respond a m -> do
+      Respond a m -> Loop <$> (m unit /\ _) <$> f b a
-        b' <- f b a
+      M m -> Loop <$> (_ /\ b) <$> m
-        pure $ Loop $ m unit /\ b'
-      M m -> do
-        n <- m
-        pure $ Loop $ (n /\ b)
       Request _ _ -> pure $ Done b
       Pure _ -> pure $ Done b
 

src/Pipes.Node.Stream.purs

@@ -3,19 +3,24 @@ module Pipes.Node.Stream where
 import Prelude hiding (join)
 
 import Control.Monad.Error.Class (class MonadThrow, throwError)
-import Control.Monad.Rec.Class (class MonadRec, Step(..), tailRecM, whileJust)
+import Control.Monad.Rec.Class (class MonadRec, Step(..), tailRecM)
 import Control.Monad.ST.Class (liftST)
+import Control.Monad.ST.Ref as ST.Ref
 import Control.Monad.ST.Ref as STRef
 import Control.Monad.Trans.Class (lift)
 import Data.Maybe (Maybe(..), maybe)
-import Data.Traversable (for_, traverse, traverse_)
+import Data.Traversable (for_, traverse_)
 import Data.Tuple.Nested ((/\))
+import Effect (Effect)
 import Effect.Aff.Class (class MonadAff, liftAff)
 import Effect.Class (liftEffect)
 import Effect.Exception (Error)
+import Node.Stream.Object (ReadResult(..), WriteResult(..))
 import Node.Stream.Object as O
 import Pipes (await, yield)
 import Pipes (for) as P
+import Pipes.Async (AsyncPipe(..))
+import Pipes.Async as AsyncPipe
 import Pipes.Core (Consumer, Pipe, Producer, Producer_)
 import Pipes.Util (InvokeResult(..), invoke)
 
@@ -83,49 +88,60 @@ fromWritable w = do
 
   tailRecM go unit
 
--- | Convert a `Transform` stream to a `Pipe`.
+fromTransformEffect
--- |
+  :: forall a b m
--- | When `Nothing` is piped to this, the `Transform` stream will
+   . MonadThrow Error m
--- | be `end`ed, and the pipe will noop if invoked again.
+  => MonadAff m
-fromTransform :: forall a b m. MonadThrow Error m => MonadAff m => O.Transform a b -> Pipe (Maybe a) (Maybe b) m Unit
+  => Effect (O.Transform a b)
-fromTransform t = do
+  -> AsyncPipe (Maybe a) (Maybe b) m Unit
-  { error: errorST, cancel: removeErrorListener } <- liftEffect $ O.withErrorST t
+fromTransformEffect = fromTransform <=< liftEffect
-  let
-    maybeThrow = traverse_ throwError =<< liftEffect (liftST $ STRef.read errorST)
 
-    cleanup = do
+-- | Convert a `Transform` stream to an `AsyncPipe`.
-      flip tailRecM unit $ const do
+fromTransform
-        liftAff $ O.awaitReadableOrClosed t
+  :: forall a b m
-        readEnded <- liftEffect $ O.isReadableEnded t
+   . MonadThrow Error m
-        yieldWhileReadable
+  => MonadAff m
-        pure $ (if readEnded then Done else Loop) unit
+  => O.Transform a b
+  -> AsyncPipe (Maybe a) (Maybe b) m Unit
+fromTransform stream = do
+    { error: errorST, cancel: removeErrorListener } <- liftEffect $ O.withErrorST stream
+    let
+      rethrow = traverse_ throwError =<< liftEffect (liftST $ ST.Ref.read errorST)
+      cleanup = liftEffect removeErrorListener
 
-      liftAff $ O.awaitFinished t
+      writeSignal =
-      maybeThrow
+        liftEffect (O.isWritableEnded stream)
-      liftEffect $ removeErrorListener
+        <#> if _ then AsyncPipe.WriteSignalEnded else AsyncPipe.WriteSignalOk
-      yield Nothing
 
-    yieldWhileReadable = void $ whileJust $ maybeYield1
+      readSignal =
+        liftEffect (O.isReadableEnded stream)
+        <#> if _ then AsyncPipe.ReadSignalEnded else AsyncPipe.ReadSignalOk
 
-    maybeYield1 = traverse (\a -> yield (Just a) $> Just unit) =<< O.maybeReadResult <$> liftEffect (O.read t)
+      writeResult WriteOk = AsyncPipe.WriteAgain
+      writeResult WriteWouldBlock = AsyncPipe.WriteNeedsDrain
 
-    onEOS = liftEffect (O.end t) *> cleanup $> Done unit
+      readResult (ReadJust a) = AsyncPipe.ReadOk (Just a)
-    onChunk a = liftEffect (O.write t a) $> Loop unit
+      readResult ReadWouldBlock = AsyncPipe.ReadWouldBlock
 
-    go _ = do
+      awaitWritable = liftAff $ O.awaitWritableOrClosed stream
-      maybeThrow
+      awaitReadable = liftAff $ O.awaitReadableOrClosed stream
-      needsDrain <- liftEffect $ O.needsDrain t
-      ended <- liftEffect $ O.isWritableEnded t
-      if needsDrain then do
-        yieldWhileReadable
-        liftAff $ O.awaitWritableOrClosed t
-        pure $ Loop unit
-      else if ended then
-        cleanup $> Done unit
-      else
-        await >>= maybe onEOS onChunk
 
-  tailRecM go unit
+      awaitWrite = rethrow *> awaitWritable *> writeSignal
+      awaitRead = rethrow *> awaitReadable *> readSignal
+
+      whenReadNotEnded m =
+        liftEffect (O.isReadableEnded stream)
+          >>= if _ then pure $ AsyncPipe.ReadOk Nothing else m
+
+      readNow = readResult <$> liftEffect (O.read stream)
+      writeNow a = writeResult <$> liftEffect (O.write stream a)
+
+      read = rethrow *> whenReadNotEnded readNow
+
+      write Nothing = liftEffect (O.end stream) $> AsyncPipe.WriteEnded
+      write (Just a) = rethrow *> writeNow a
+
+    AsyncIO ({write, awaitWrite, read, awaitRead} /\ cleanup)
 
 -- | Given a `Producer` of values, wrap them in `Just`.
 -- |

src/Pipes.Node.Zlib.purs

@@ -12,31 +12,32 @@ import Node.Buffer (Buffer)
 import Node.Stream.Object as O
 import Node.Zlib as Zlib
 import Node.Zlib.Types (ZlibStream)
-import Pipes.Core (Pipe)
+import Pipes.Async (AsyncPipe)
 import Pipes.Node.Stream (fromTransform)
 
-fromZlib :: forall r m. MonadAff m => MonadThrow Error m => Effect (ZlibStream r) -> Pipe (Maybe Buffer) (Maybe Buffer) m Unit
+fromZlib :: forall r m. MonadAff m => MonadThrow Error m => Effect (ZlibStream r) -> AsyncPipe (Maybe Buffer) (Maybe Buffer) m Unit
-fromZlib z = do
+fromZlib z =
-  raw <- liftEffect $ Zlib.toDuplex <$> z
+  do
-  fromTransform $ O.unsafeCoerceTransform raw
+    raw <- liftEffect $ Zlib.toDuplex <$> z
+    fromTransform $ O.unsafeCoerceTransform raw
 
-gzip :: forall m. MonadAff m => MonadThrow Error m => Pipe (Maybe Buffer) (Maybe Buffer) m Unit
+gzip :: forall m. MonadAff m => MonadThrow Error m => AsyncPipe (Maybe Buffer) (Maybe Buffer) m Unit
 gzip = fromZlib Zlib.createGzip
 
-gunzip :: forall m. MonadAff m => MonadThrow Error m => Pipe (Maybe Buffer) (Maybe Buffer) m Unit
+gunzip :: forall m. MonadAff m => MonadThrow Error m => AsyncPipe (Maybe Buffer) (Maybe Buffer) m Unit
 gunzip = fromZlib Zlib.createGunzip
 
-unzip :: forall m. MonadAff m => MonadThrow Error m => Pipe (Maybe Buffer) (Maybe Buffer) m Unit
+unzip :: forall m. MonadAff m => MonadThrow Error m => AsyncPipe (Maybe Buffer) (Maybe Buffer) m Unit
 unzip = fromZlib Zlib.createUnzip
 
-inflate :: forall m. MonadAff m => MonadThrow Error m => Pipe (Maybe Buffer) (Maybe Buffer) m Unit
+inflate :: forall m. MonadAff m => MonadThrow Error m => AsyncPipe (Maybe Buffer) (Maybe Buffer) m Unit
 inflate = fromZlib Zlib.createInflate
 
-deflate :: forall m. MonadAff m => MonadThrow Error m => Pipe (Maybe Buffer) (Maybe Buffer) m Unit
+deflate :: forall m. MonadAff m => MonadThrow Error m => AsyncPipe (Maybe Buffer) (Maybe Buffer) m Unit
 deflate = fromZlib Zlib.createDeflate
 
-brotliCompress :: forall m. MonadAff m => MonadThrow Error m => Pipe (Maybe Buffer) (Maybe Buffer) m Unit
+brotliCompress :: forall m. MonadAff m => MonadThrow Error m => AsyncPipe (Maybe Buffer) (Maybe Buffer) m Unit
 brotliCompress = fromZlib Zlib.createBrotliCompress
 
-brotliDecompress :: forall m. MonadAff m => MonadThrow Error m => Pipe (Maybe Buffer) (Maybe Buffer) m Unit
+brotliDecompress :: forall m. MonadAff m => MonadThrow Error m => AsyncPipe (Maybe Buffer) (Maybe Buffer) m Unit
 brotliDecompress = fromZlib Zlib.createBrotliDecompress

src/Pipes.Util.purs

@@ -15,9 +15,12 @@ import Data.Either (hush)
 import Data.HashSet as HashSet
 import Data.Hashable (class Hashable, hash)
 import Data.List.NonEmpty (NonEmptyList)
-import Data.Maybe (Maybe(..), fromMaybe)
+import Data.Maybe (Maybe(..), fromMaybe, maybe)
+import Data.Traversable (traverse_)
 import Data.Tuple.Nested (type (/\), (/\))
 import Effect.Class (class MonadEffect, liftEffect)
+import Node.Buffer (Buffer)
+import Node.Buffer as Buffer
 import Pipes (await, yield)
 import Pipes as Pipes
 import Pipes.Core (Pipe, Producer)
@@ -96,6 +99,30 @@ chunked size = do
 
   yield Nothing
 
+-- | Buffers input to the given size before passing to subsequent pipes
+buffered :: forall m. MonadEffect m => Int -> Pipe (Maybe Buffer) (Maybe Buffer) m Unit
+buffered size = do
+  chunkST :: STRef _ (Maybe Buffer) <- liftEffect $ liftST $ STRef.new Nothing
+
+  let
+    chunkClear = liftEffect $ liftST $ STRef.write Nothing chunkST
+    chunkPeek = liftEffect $ liftST $ STRef.read chunkST
+    chunkLen = maybe (pure 0) (liftEffect <<< Buffer.size) =<< chunkPeek
+    chunkPut b = liftEffect do
+      new <- liftST (STRef.read chunkST) >>= maybe (pure b) (\a -> Buffer.concat [a, b])
+      void $ liftST $ STRef.write (Just new) chunkST
+      pure new
+
+  Rec.whileJust $ runMaybeT do
+    a <- MaybeT await
+    buf <- chunkPut a
+    len <- lift chunkLen
+    when (len > size) $ chunkClear *> lift (yield $ Just buf)
+
+  len <- chunkLen
+  chunkPeek >>= traverse_ (when (len > 0) <<< yield <<< Just)
+  yield Nothing
+
 -- | Equivalent of unix `uniq`, filtering out duplicate values passed to it.
 -- |
 -- | Uses a `HashSet` of hashes of `a`; for `n` elements `awaited`, this pipe

test/Test/Main.purs

@@ -3,18 +3,19 @@ module Test.Main where
 import Prelude
 
 import Data.Maybe (Maybe(..))
+import Data.Time.Duration (Milliseconds(..))
 import Effect (Effect)
 import Effect.Aff (launchAff_)
-import Test.Pipes.Node.Stream as Test.Pipes.Node.Stream
-import Test.Pipes.Node.Buffer as Test.Pipes.Node.Buffer
-import Test.Pipes.Node.FS as Test.Pipes.Node.FS
 import Test.Pipes.Collect as Test.Pipes.Collect
 import Test.Pipes.Construct as Test.Pipes.Construct
+import Test.Pipes.Node.Buffer as Test.Pipes.Node.Buffer
+import Test.Pipes.Node.FS as Test.Pipes.Node.FS
+import Test.Pipes.Node.Stream as Test.Pipes.Node.Stream
 import Test.Spec.Reporter (specReporter)
 import Test.Spec.Runner (defaultConfig, runSpec')
 
 main :: Effect Unit
-main = launchAff_ $ runSpec' (defaultConfig { exit = false, timeout = Nothing }) [ specReporter ] do
+main = launchAff_ $ runSpec' (defaultConfig { slow = Milliseconds 0.0, failFast = true, exit = false, timeout = Nothing }) [ specReporter ] do
   Test.Pipes.Node.Stream.spec
   Test.Pipes.Node.Buffer.spec
   Test.Pipes.Node.FS.spec

test/Test/Pipes.Node.Stream.js

@@ -1,4 +1,16 @@
 import Stream from 'stream'
+import * as CBOR from "cbor-x";
+import * as CSVDecode from "csv-parse";
+import * as CSVEncode from "csv-stringify";
+
+export const cborDecode = () => new CBOR.DecoderStream({useRecords: false, allowHalfOpen: true});
+export const cborEncode = () => new CBOR.EncoderStream({useRecords: false, allowHalfOpen: true});
+
+export const cborDecodeSync = a => () => CBOR.decodeMultiple(a);
+export const cborEncodeSync = a => () => CBOR.encode(a, {useRecords: false});
+
+export const csvDecode = () => CSVDecode.parse({columns: true, allowHalfOpen: true})
+export const csvEncode = () => CSVEncode.stringify({header: true, allowHalfOpen: true})
 
 export const discardTransform = () => new Stream.Transform({
   transform: function(_ck, _enc, cb) {
@@ -7,6 +19,16 @@ export const discardTransform = () => new Stream.Transform({
   objectMode: true
 })
 
+export const slowTransform = () => {
+  return new Stream.Transform({
+  transform: function(ck, _enc, cb) {
+    this.push(ck)
+    setTimeout(() => cb(), 4)
+  },
+  objectMode: true
+})
+}
+
 export const charsTransform = () => new Stream.Transform({
   transform: function(ck, _enc, cb) {
     ck.split('').filter(s => !!s).forEach(s => this.push(s))

test/Test/Pipes.Node.Stream.purs

@@ -2,49 +2,72 @@ module Test.Pipes.Node.Stream where
 
 import Prelude
 
-import Control.Monad.Trans.Class (lift)
+import Control.Monad.Cont (lift)
+import Control.Monad.Error.Class (liftEither)
+import Control.Monad.Except (runExcept)
 import Data.Array as Array
-import Data.Foldable (fold)
+import Data.Bifunctor (lmap)
+import Data.Either (Either(..))
+import Data.Foldable (fold, intercalate)
+import Data.FoldableWithIndex (forWithIndex_)
+import Data.FunctorWithIndex (mapWithIndex)
+import Data.Int as Int
 import Data.List ((:))
 import Data.List as List
 import Data.Maybe (Maybe)
 import Data.Newtype (wrap)
+import Data.Profunctor.Strong (first)
+import Data.String as String
 import Data.String.Gen (genAlphaString)
+import Data.Traversable (for_, traverse)
 import Data.Tuple.Nested (type (/\), (/\))
 import Effect (Effect)
 import Effect.Aff (Aff, delay)
 import Effect.Class (class MonadEffect, liftEffect)
+import Effect.Exception (error)
+import Effect.Unsafe (unsafePerformEffect)
+import Foreign (Foreign)
 import Node.Buffer (Buffer)
 import Node.Buffer as Buffer
 import Node.Encoding (Encoding(..))
 import Node.FS.Stream as FS.Stream
 import Node.FS.Sync as FS
 import Node.Stream.Object as O
-import Node.Zlib as Zlib
+import Pipes (each) as Pipe
-import Pipes (each) as Pipes
 import Pipes (yield, (>->))
+import Pipes.Async (sync, (>-/->))
+import Pipes.Collect as Pipe.Collect
 import Pipes.Core (Consumer, Producer, runEffect)
-import Pipes.Node.Buffer as Pipes.Buffer
+import Pipes.Node.Buffer as Pipe.Buffer
-import Pipes.Node.Stream as S
+import Pipes.Node.FS as Pipe.FS
-import Pipes.Prelude (mapFoldable, toListM) as Pipes
+import Pipes.Node.Stream as Pipe.Node
-import Simple.JSON (writeJSON)
+import Pipes.Node.Zlib as Pipe.Zlib
-import Test.Common (jsonParse, jsonStringify, tmpFile, tmpFiles)
+import Pipes.Prelude (toListM) as Pipe
+import Simple.JSON (readImpl, readJSON, writeJSON)
+import Test.Common (jsonStringify, tmpFile, tmpFiles)
 import Test.QuickCheck.Arbitrary (arbitrary)
 import Test.QuickCheck.Gen (randomSample')
 import Test.Spec (Spec, around, describe, it)
-import Test.Spec.Assertions (shouldEqual)
+import Test.Spec.Assertions (fail, shouldEqual)
 
 foreign import readableFromArray :: forall @a. Array a -> O.Readable a
 foreign import discardTransform :: forall a b. Effect (O.Transform a b)
+foreign import slowTransform :: forall a b. Effect (O.Transform a b)
 foreign import charsTransform :: Effect (O.Transform String String)
+foreign import cborEncodeSync :: forall a. a -> Effect Buffer
+foreign import cborDecodeSync :: forall a. Buffer -> Effect a
+foreign import cborEncode :: forall a. Effect (O.Transform a Buffer)
+foreign import cborDecode :: forall a. Effect (O.Transform Buffer a)
+foreign import csvEncode :: forall a. Effect (O.Transform a String)
+foreign import csvDecode :: forall a. Effect (O.Transform String a)
 
 writer :: forall m. MonadEffect m => String -> m (O.Writable Buffer /\ Consumer (Maybe Buffer) Aff Unit)
 writer a = do
   stream <- liftEffect $ O.unsafeCoerceWritable <$> FS.Stream.createWriteStream a
-  pure $ stream /\ S.fromWritable stream
+  pure $ stream /\ Pipe.Node.fromWritable stream
 
 reader :: forall m. MonadEffect m => String -> m (Producer (Maybe Buffer) Aff Unit)
-reader a = liftEffect $ S.fromReadable <$> O.unsafeCoerceReadable <$> FS.Stream.createReadStream a
+reader a = liftEffect $ Pipe.Node.fromReadable <$> O.unsafeCoerceReadable <$> FS.Stream.createReadStream a
 
 spec :: Spec Unit
 spec =
@@ -52,30 +75,30 @@ spec =
     describe "Readable" do
       describe "Readable.from(<Iterable>)" do
         it "empty" do
-          vals <- Pipes.toListM $ (S.fromReadable $ readableFromArray @{ foo :: String } []) >-> S.unEOS
+          vals <- Pipe.toListM $ (Pipe.Node.fromReadable $ readableFromArray @{ foo :: String } []) >-> Pipe.Node.unEOS
           vals `shouldEqual` List.Nil
         it "singleton" do
-          vals <- Pipes.toListM $ (S.fromReadable $ readableFromArray @{ foo :: String } [ { foo: "1" } ]) >-> S.unEOS
+          vals <- Pipe.toListM $ (Pipe.Node.fromReadable $ readableFromArray @{ foo :: String } [ { foo: "1" } ]) >-> Pipe.Node.unEOS
           vals `shouldEqual` ({ foo: "1" } : List.Nil)
         it "many elements" do
           let exp = (\n -> { foo: show n }) <$> Array.range 0 100
-          vals <- Pipes.toListM $ (S.fromReadable $ readableFromArray exp) >-> S.unEOS
+          vals <- Pipe.toListM $ (Pipe.Node.fromReadable $ readableFromArray exp) >-> Pipe.Node.unEOS
           vals `shouldEqual` (List.fromFoldable exp)
     describe "Writable" $ around tmpFile do
       describe "fs.WriteStream" do
         it "pipe to file" \p -> do
           stream <- O.unsafeCoerceWritable <$> liftEffect (FS.Stream.createWriteStream p)
           let
-            w = S.fromWritable stream
+            w = Pipe.Node.fromWritable stream
             source = do
               buf <- liftEffect $ Buffer.fromString "hello" UTF8
               yield buf
-          runEffect $ S.withEOS source >-> w
+          runEffect $ Pipe.Node.withEOS source >-> w
           contents <- liftEffect $ FS.readTextFile UTF8 p
           contents `shouldEqual` "hello"
           shouldEqual true =<< liftEffect (O.isWritableEnded stream)
         it "async pipe to file" \p -> do
-          w <- S.fromWritable <$> O.unsafeCoerceWritable <$> liftEffect (FS.Stream.createWriteStream p)
+          w <- Pipe.Node.fromWritable <$> O.unsafeCoerceWritable <$> liftEffect (FS.Stream.createWriteStream p)
           let
             source = do
               yield "hello, "
@@ -87,7 +110,7 @@ spec =
               yield "this is a "
               lift $ delay $ wrap 5.0
               yield "test."
-          runEffect $ S.withEOS (source >-> Pipes.Buffer.fromString UTF8) >-> w
+          runEffect $ Pipe.Node.withEOS (source >-> Pipe.Buffer.fromString UTF8) >-> w
           contents <- liftEffect $ FS.readTextFile UTF8 p
           contents `shouldEqual` "hello, world! this is a test."
         it "chained pipes" \p -> do
@@ -101,40 +124,105 @@ spec =
           let
             exp = fold (writeJSON <$> objs)
           stream /\ w <- liftEffect $ writer p
-          runEffect $ S.withEOS (Pipes.each objs >-> jsonStringify >-> Pipes.Buffer.fromString UTF8) >-> w
+          runEffect $ Pipe.Node.withEOS (Pipe.each objs >-> jsonStringify >-> Pipe.Buffer.fromString UTF8) >-> w
           contents <- liftEffect $ FS.readTextFile UTF8 p
           contents `shouldEqual` exp
           shouldEqual true =<< liftEffect (O.isWritableEnded stream)
     describe "Transform" do
-      it "gzip" do
+      let
-        let
+        bignums = Array.range 1 1000
-          json = yield $ writeJSON { foo: "bar" }
+        firstNames = String.split (wrap "\n") $ unsafePerformEffect (FS.readTextFile UTF8 "./test/Test/first_names.txt")
-          exp = "1f8b0800000000000003ab564acbcf57b2524a4a2c52aa0500eff52bfe0d000000"
+        lastNames = String.split (wrap "\n") $ unsafePerformEffect (FS.readTextFile UTF8 "./test/Test/last_names.txt")
-        gzip <- S.fromTransform <$> O.unsafeCoerceTransform <$> liftEffect (Zlib.toDuplex <$> Zlib.createGzip)
+        names n = do
-        outs :: List.List String <- Pipes.toListM (S.withEOS (json >-> Pipes.Buffer.fromString UTF8) >-> gzip >-> S.unEOS >-> Pipes.Buffer.toString Hex)
+          first <- firstNames
-        fold outs `shouldEqual` exp
+          last <- Array.take (Int.round $ Int.toNumber n / Int.toNumber (Array.length firstNames)) lastNames
-      around tmpFiles
+          pure $ first <> " " <> last
-        $ it "file >-> gzip >-> file >-> gunzip" \(a /\ b) -> do
+        people n = mapWithIndex (\ix name -> {id: show $ ix + 1, name}) (names n)
-            liftEffect $ FS.writeTextFile UTF8 a $ writeJSON [ 1, 2, 3, 4 ]
+        peopleCSV n = "id,name\n" <> intercalate "\n" ((\{id, name} -> id <> "," <> name) <$> people n)
-            areader <- liftEffect $ reader a
-            bwritestream /\ bwriter <- liftEffect $ writer b
-            gzip <- S.fromTransform <$> O.unsafeCoerceTransform <$> liftEffect (Zlib.toDuplex <$> Zlib.createGzip)
-            runEffect $ areader >-> gzip >-> bwriter
-            shouldEqual true =<< liftEffect (O.isWritableEnded bwritestream)
 
-            gunzip <- S.fromTransform <$> O.unsafeCoerceTransform <$> liftEffect (Zlib.toDuplex <$> Zlib.createGunzip)
+      for_ [4000, 8000, 32000, 64000, 200000] \n -> do
-            breader <- liftEffect $ reader b
+        let
-            nums <- Pipes.toListM (breader >-> gunzip >-> S.unEOS >-> Pipes.Buffer.toString UTF8 >-> jsonParse @(Array Int) >-> Pipes.mapFoldable identity)
+          csv = peopleCSV n
-            Array.fromFoldable nums `shouldEqual` [ 1, 2, 3, 4 ]
+          people' = people n
+        around tmpFiles
+          $ it (show n <> " row csv >-/-> csv-parse >-/-> cborEncode") \(a /\ _) -> do
+              liftEffect $ FS.writeTextFile UTF8 a csv
+              cbor :: Buffer <- Pipe.Collect.toBuffer
+                $ Pipe.FS.read a
+                  >-> Pipe.Node.inEOS (Pipe.Buffer.toString UTF8)
+                  >-/-> Pipe.Node.fromTransformEffect csvDecode
+                  >-/-> Pipe.Node.fromTransformEffect cborEncode
+                  >-> Pipe.Node.unEOS
+              f :: Array Foreign <- liftEffect $ cborDecodeSync cbor
+              ppl <- traverse (liftEither <<< lmap (error <<< show) <<< runExcept <<< readImpl) f
+              ppl `shouldEqual` people'
+
+        around tmpFiles
+          $ it (show n <> " row csv >-> sync csv-parse >-> sync cborEncode") \(a /\ _) -> do
+              liftEffect $ FS.writeTextFile UTF8 a csv
+              cbor :: Buffer <- Pipe.Collect.toBuffer
+                $ Pipe.FS.read a
+                  >-> Pipe.Node.inEOS (Pipe.Buffer.toString UTF8)
+                  >-> sync (Pipe.Node.fromTransformEffect csvDecode)
+                  >-> sync (Pipe.Node.fromTransformEffect cborEncode)
+                  >-> Pipe.Node.unEOS
+              f :: Array Foreign <- liftEffect $ cborDecodeSync cbor
+              ppl <- traverse (liftEither <<< lmap (error <<< show) <<< runExcept <<< readImpl) f
+              ppl `shouldEqual` people'
+
+      around tmpFiles
+        $ it "file >-> sync gzip >-> sync gunzip" \(a /\ _) -> do
+            liftEffect $ FS.writeTextFile UTF8 a $ writeJSON bignums
+            json <- Pipe.Collect.toMonoid
+              $ Pipe.FS.read a
+                >-> sync Pipe.Zlib.gzip
+                >-> sync Pipe.Zlib.gunzip
+                >-> Pipe.Node.unEOS
+                >-> Pipe.Buffer.toString UTF8
+            readJSON json `shouldEqual` (Right bignums)
+
+      around tmpFiles
+        $ it "file >-/-> gzip >-/-> slow >-/-> gunzip" \(a /\ _) -> do
+            liftEffect $ FS.writeTextFile UTF8 a $ writeJSON bignums
+            json <-
+              Pipe.Collect.toMonoid
+              $ Pipe.FS.read a
+                >-/-> Pipe.Zlib.gzip
+                >-/-> Pipe.Node.fromTransformEffect slowTransform
+                >-/-> Pipe.Zlib.gunzip
+                >-> Pipe.Node.unEOS
+                >-> Pipe.Buffer.toString UTF8
+
+            readJSON json `shouldEqual` (Right bignums)
+      around tmpFiles
+        $ it "file >-> sync gzip >-> sync slow >-> sync gunzip" \(a /\ _) -> do
+            liftEffect $ FS.writeTextFile UTF8 a $ writeJSON bignums
+            json <-
+              Pipe.Collect.toMonoid
+              $ Pipe.FS.read a
+                >-> sync Pipe.Zlib.gzip
+                >-> sync (Pipe.Node.fromTransformEffect slowTransform)
+                >-> sync Pipe.Zlib.gunzip
+                >-> Pipe.Node.unEOS
+                >-> Pipe.Buffer.toString UTF8
+
+            readJSON json `shouldEqual` (Right bignums)
       around tmpFile $ it "file >-> discardTransform" \(p :: String) -> do
         liftEffect $ FS.writeTextFile UTF8 p "foo"
         r <- reader p
-        discard' <- liftEffect discardTransform
+        out :: List.List Int <-
-        out :: List.List Int <- Pipes.toListM $ r >-> S.fromTransform discard' >-> S.unEOS
+          Pipe.toListM
+            $ r
+                >-/-> Pipe.Node.fromTransformEffect discardTransform
+                >-> Pipe.Node.unEOS
         out `shouldEqual` List.Nil
       around tmpFile $ it "file >-> charsTransform" \(p :: String) -> do
         liftEffect $ FS.writeTextFile UTF8 p "foo bar"
         r <- reader p
-        chars' <- liftEffect charsTransform
+        out :: List.List String <-
-        out :: List.List String <- Pipes.toListM $ r >-> S.inEOS (Pipes.Buffer.toString UTF8) >-> S.fromTransform chars' >-> S.unEOS
+          Pipe.toListM $
+            r
+            >-> Pipe.Node.inEOS (Pipe.Buffer.toString UTF8)
+            >-/-> Pipe.Node.fromTransformEffect charsTransform
+            >-> Pipe.Node.unEOS
         out `shouldEqual` List.fromFoldable [ "f", "o", "o", " ", "b", "a", "r" ]