Remove zstdpool-syncpool

It was initially created due to goroutine leakage as described in
klauspost/compress#264, but that has now been
fixed in the zstd package. So it's safe to use zstd Encoders/Decoders in
sync.Pool directly, as long as concurrency is disabled.

go.mod

@@ -6,8 +6,7 @@ require (
 	github.com/bazelbuild/remote-apis v0.0.0-20230411132548-35aee1c4a425
 	github.com/golang/glog v1.1.0
 	github.com/google/go-cmp v0.5.9
-	github.com/klauspost/compress v1.12.3
-	github.com/mostynb/zstdpool-syncpool v0.0.7
+	github.com/klauspost/compress v1.17.8
 	github.com/pborman/uuid v1.2.0
 	github.com/pkg/errors v0.9.1
 	github.com/pkg/xattr v0.4.4

go.sum

@@ -51,8 +51,8 @@ github.com/google/uuid v1.3.0 h1:t6JiXgmwXMjEs8VusXIJk2BXHsn+wx8BZdTaoZ5fu7I=
 github.com/google/uuid v1.3.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 github.com/klauspost/compress v1.12.3 h1:G5AfA94pHPysR56qqrkO2pxEexdDzrpFJ6yt/VqWxVU=
 github.com/klauspost/compress v1.12.3/go.mod h1:8dP1Hq4DHOhN9w426knH3Rhby4rFm6D8eO+e+Dq5Gzg=
-github.com/mostynb/zstdpool-syncpool v0.0.7 h1:meYfUODlzmtOCrFmbJsUVEIt5rbmNUsz+Bu+Vnr95ls=
-github.com/mostynb/zstdpool-syncpool v0.0.7/go.mod h1:YpzqIpN8xvRZZvemem7CMLPWkjuaKR37MnkQruSj6aw=
+github.com/klauspost/compress v1.17.8 h1:YcnTYrq7MikUT7k0Yb5eceMmALQPYBW/Xltxn0NAMnU=
+github.com/klauspost/compress v1.17.8/go.mod h1:Di0epgTjJY877eYKx5yC51cX2A2Vl2ibi7bDH9ttBbw=
 github.com/pborman/uuid v1.2.0 h1:J7Q5mO4ysT1dv8hyrUGHb9+ooztCXu1D8MY8DZYsu3g=
 github.com/pborman/uuid v1.2.0/go.mod h1:X/NO0urCmaxf9VXbdlT7C2Yzkj2IKimNn4k+gtPdI/k=
 github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=

go/pkg/client/BUILD.bazel

@@ -30,7 +30,6 @@ go_library(
         "@com_github_bazelbuild_remote_apis//build/bazel/remote/execution/v2:remote_execution_go_proto",
         "@com_github_golang_glog//:go_default_library",
         "@com_github_klauspost_compress//zstd:go_default_library",
-        "@com_github_mostynb_zstdpool_syncpool//:go_default_library",
         "@com_github_pborman_uuid//:go_default_library",
         "@com_github_pkg_errors//:go_default_library",
         "@go_googleapis//google/bytestream:bytestream_go_proto",

go/pkg/client/cas_download.go

@@ -18,7 +18,6 @@ import (
 	repb "github.com/bazelbuild/remote-apis/build/bazel/remote/execution/v2"
 	log "github.com/golang/glog"
 	"github.com/klauspost/compress/zstd"
-	syncpool "github.com/mostynb/zstdpool-syncpool"
 	"golang.org/x/sync/errgroup"
 	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/status"
@@ -536,11 +535,19 @@ func NewCompressedWriteBuffer(w io.Writer) (io.WriteCloser, chan error, error) {
 	r, nw := io.Pipe()
 
 	decoderInit.Do(func() {
-		decoders = syncpool.NewDecoderPool(zstd.WithDecoderConcurrency(1))
+		decoders = &sync.Pool{
+			New: func() interface{} {
+				d, err := zstd.NewReader(nil, zstd.WithDecoderConcurrency(1))
+				if err != nil {
+					return nil
+				}
+				return d
+			},
+		}
 	})
 
 	decdIntf := decoders.Get()
-	decoderW, ok := decdIntf.(*syncpool.DecoderWrapper)
+	decoderW, ok := decdIntf.(*zstd.Decoder)
 	if !ok || decoderW == nil {
 		return nil, nil, fmt.Errorf("failed creating new decoder")
 	}
@@ -562,8 +569,10 @@ func NewCompressedWriteBuffer(w io.Writer) (io.WriteCloser, chan error, error) {
 			// have to go somewhere or they'll block execution.
 			io.Copy(io.Discard, r)
 		}
-		// DecoderWrapper.Close moves the decoder back to the Pool.
-		decoderW.Close()
+		// Reset and move the decoder back to the Pool.
+		if decoderW.Reset(nil) == nil {
+			decoders.Put(decoderW)
+		}
 		done <- err
 	}()
 

go/pkg/reader/BUILD.bazel

@@ -7,7 +7,6 @@ go_library(
     visibility = ["//visibility:public"],
     deps = [
         "@com_github_klauspost_compress//zstd:go_default_library",
-        "@com_github_mostynb_zstdpool_syncpool//:go_default_library",
     ],
 )
 

go/pkg/reader/reader.go

@@ -10,7 +10,6 @@ import (
 	"sync"
 
 	"github.com/klauspost/compress/zstd"
-	syncpool "github.com/mostynb/zstdpool-syncpool"
 )
 
 // errNotInitialized is the error returned from Read() by a ReedSeeker that
@@ -156,7 +155,7 @@ func (sb *syncedBuffer) Reset() {
 
 type compressedSeeker struct {
 	fs    ReadSeeker
-	encdW *syncpool.EncoderWrapper
+	encdW *zstd.Encoder
 	// This keeps the compressed data
 	buf *syncedBuffer
 }
@@ -176,14 +175,22 @@ func NewCompressedSeeker(fs ReadSeeker) (ReadSeeker, error) {
 	}
 
 	encoderInit.Do(func() {
-		encoders = syncpool.NewEncoderPool(zstd.WithEncoderConcurrency(1))
+		encoders = &sync.Pool{
+			New: func() interface{} {
+				e, err := zstd.NewWriter(nil, zstd.WithEncoderConcurrency(1))
+				if err != nil {
+					return nil
+				}
+				return e
+			},
+		}
 	})
 
 	buf := bytes.NewBuffer(nil)
 	sb := &syncedBuffer{buf: buf}
 
 	encdIntf := encoders.Get()
-	encdW, ok := encdIntf.(*syncpool.EncoderWrapper)
+	encdW, ok := encdIntf.(*zstd.Encoder)
 	if !ok || encdW == nil {
 		return nil, errors.New("failed creating new encoder")
 	}
@@ -245,7 +252,7 @@ func (cfs *compressedSeeker) SeekOffset(offset int64) error {
 	if cfs.encdW == nil {
 		encdIntf := encoders.Get()
 		var ok bool
-		cfs.encdW, ok = encdIntf.(*syncpool.EncoderWrapper)
+		cfs.encdW, ok = encdIntf.(*zstd.Encoder)
 		if !ok || cfs.encdW == nil {
 			return errors.New("failed to get a new encoder")
 		}

go_deps.bzl

@@ -118,14 +118,8 @@ def remote_apis_sdks_go_deps():
     go_repository(
         name = "com_github_klauspost_compress",
         importpath = "github.com/klauspost/compress",
-        sum = "h1:G5AfA94pHPysR56qqrkO2pxEexdDzrpFJ6yt/VqWxVU=",
-        version = "v1.12.3",
-    )
-    go_repository(
-        name = "com_github_mostynb_zstdpool_syncpool",
-        importpath = "github.com/mostynb/zstdpool-syncpool",
-        sum = "h1:meYfUODlzmtOCrFmbJsUVEIt5rbmNUsz+Bu+Vnr95ls=",
-        version = "v0.0.7",
+        sum = "h1:YcnTYrq7MikUT7k0Yb5eceMmALQPYBW/Xltxn0NAMnU=",
+        version = "v1.17.8",
     )
     go_repository(
         name = "com_github_pborman_uuid",