Add pool support everywhere

faketls/client_protocol.go

@@ -63,7 +63,12 @@ func (c *ClientProtocol) tlsHandshake(conn io.ReadWriter) error {
 		return fmt.Errorf("cannot read initial record: %w", err)
 	}
 
-	clientHello, err := tlstypes.ParseClientHello(helloRecord.Data.Bytes())
+	buf := acquireBytesBuffer()
+	defer releaseBytesBuffer(buf)
+
+	helloRecord.Data.WriteBytes(buf)
+
+	clientHello, err := tlstypes.ParseClientHello(buf.Bytes())
 	if err != nil {
 		return fmt.Errorf("cannot parse client hello: %w", err)
 	}

faketls/cloak.go

@@ -28,15 +28,9 @@ func cloak(one, another io.ReadWriteCloser) {
 
 	wg.Add(2)
 
-	go func() {
+	go cloakPipe(one, another, wg)
-		defer wg.Done()
-		io.Copy(one, another) // nolint: errcheck
-	}()
 
-	go func() {
+	go cloakPipe(another, one, wg)
-		defer wg.Done()
-		io.Copy(another, one) // nolint: errcheck
-	}()
 
 	go func() {
 		wg.Wait()
@@ -69,3 +63,12 @@ func cloak(one, another io.ReadWriteCloser) {
 
 	<-ctx.Done()
 }
+
+func cloakPipe(one io.Writer, another io.Reader, wg *sync.WaitGroup) {
+	defer wg.Done()
+
+	buf := acquireCloakBuffer()
+	defer releaseCloakBuffer(buf)
+
+	io.CopyBuffer(one, another, *buf) // nolint: errcheck
+}

faketls/pools.go

@@ -0,0 +1,38 @@
+package faketls
+
+import (
+	"bytes"
+	"sync"
+)
+
+const cloakBufferSize = 1024
+
+var (
+	poolBytesBuffer = sync.Pool{
+		New: func() interface{} {
+			return &bytes.Buffer{}
+		},
+	}
+	poolCloakBuffer = sync.Pool{
+		New: func() interface{} {
+			rv := make([]byte, cloakBufferSize)
+			return &rv
+		},
+	}
+)
+
+func acquireBytesBuffer() *bytes.Buffer {
+	return poolBytesBuffer.Get().(*bytes.Buffer)
+}
+
+func acquireCloakBuffer() *[]byte {
+	return poolCloakBuffer.Get().(*[]byte)
+}
+
+func releaseBytesBuffer(buf *bytes.Buffer) {
+	poolBytesBuffer.Put(buf)
+}
+
+func releaseCloakBuffer(buf *[]byte) {
+	poolCloakBuffer.Put(buf)
+}

tlstypes/client_hello.go

@@ -25,7 +25,7 @@ func (c ClientHello) Digest() []byte {
 	}
 
 	mac := hmac.New(sha256.New, config.C.Secret)
-	mac.Write(rec.Bytes()) // nolint: errcheck
+	rec.WriteBytes(mac)
 	computedDigest := mac.Sum(nil)
 
 	for i := range computedDigest {

tlstypes/consts.go

@@ -1,5 +1,7 @@
 package tlstypes
 
+import "io"
+
 type RecordType uint8
 
 const (
@@ -69,11 +71,16 @@ var (
 )
 
 type Byter interface {
-	Bytes() []byte
+	WriteBytes(io.Writer)
+	Len() int
 }
 
 type RawBytes []byte
 
-func (r RawBytes) Bytes() []byte {
+func (r RawBytes) WriteBytes(writer io.Writer) {
-	return []byte(r)
+	writer.Write(r) // nolint: errcheck
+}
+
+func (r RawBytes) Len() int {
+	return len(r)
 }

tlstypes/handshake.go

@@ -1,7 +1,7 @@
 package tlstypes
 
 import (
-	"bytes"
+	"io"
 
 	"github.com/9seconds/mtg/utils"
 )
@@ -14,24 +14,31 @@ type Handshake struct {
 	Tail      Byter
 }
 
-func (h *Handshake) Bytes() []byte {
+func (h *Handshake) WriteBytes(writer io.Writer) {
-	buf := bytes.Buffer{}
+	packetBuf := acquireBytesBuffer()
-	packetBuf := bytes.Buffer{}
+	defer releaseBytesBuffer(packetBuf)
 
-	buf.WriteByte(byte(h.Type))
+	writer.Write([]byte{byte(h.Type)}) // nolint: errcheck
 
 	packetBuf.Write(h.Version.Bytes())
 	packetBuf.Write(h.Random[:])
 	packetBuf.WriteByte(byte(len(h.SessionID)))
 	packetBuf.Write(h.SessionID)
-	packetBuf.Write(h.Tail.Bytes())
+	h.Tail.WriteBytes(packetBuf)
 
 	sizeUint24 := utils.ToUint24(uint32(packetBuf.Len()))
 	sizeUint24Bytes := sizeUint24[:]
 	sizeUint24Bytes[0], sizeUint24Bytes[2] = sizeUint24Bytes[2], sizeUint24Bytes[0]
 
-	buf.Write(sizeUint24Bytes)
+	writer.Write(sizeUint24Bytes) // nolint: errcheck
-	packetBuf.WriteTo(&buf) // nolint: errcheck
+	packetBuf.WriteTo(writer)     // nolint: errcheck
+}
 
-	return buf.Bytes()
+func (h *Handshake) Len() int {
+	buf := acquireBytesBuffer()
+	defer releaseBytesBuffer(buf)
+
+	h.WriteBytes(buf)
+
+	return buf.Len()
 }

tlstypes/pools.go

@@ -0,0 +1,23 @@
+package tlstypes
+
+import (
+	"bytes"
+	"sync"
+)
+
+var (
+	poolBytesBuffer = sync.Pool{
+		New: func() interface{} {
+			return &bytes.Buffer{}
+		},
+	}
+)
+
+func acquireBytesBuffer() *bytes.Buffer {
+	return poolBytesBuffer.Get().(*bytes.Buffer)
+}
+
+func releaseBytesBuffer(buf *bytes.Buffer) {
+	buf.Reset()
+	poolBytesBuffer.Put(buf)
+}

tlstypes/record.go

@@ -15,16 +15,15 @@ type Record struct {
 	Data    Byter
 }
 
-func (r Record) Bytes() []byte {
+func (r Record) WriteBytes(writer io.Writer) {
-	buf := bytes.Buffer{}
+	writer.Write([]byte{byte(r.Type)})                           // nolint: errcheck
-	data := r.Data.Bytes()
+	writer.Write(r.Version.Bytes())                              // nolint: errcheck
+	binary.Write(writer, binary.BigEndian, uint16(r.Data.Len())) // nolint: errcheck
+	r.Data.WriteBytes(writer)
+}
 
-	buf.WriteByte(byte(r.Type))
+func (r Record) Len() int {
-	buf.Write(r.Version.Bytes())
+	return 1 + 2 + 2 + r.Data.Len()
-	binary.Write(&buf, binary.BigEndian, uint16(len(data))) // nolint: errcheck
-	buf.Write(data)
-
-	return buf.Bytes()
 }
 
 func ReadRecord(reader io.Reader) (Record, error) {

tlstypes/server_hello.go

@@ -20,20 +20,22 @@ type ServerHello struct {
 }
 
 func (s ServerHello) WelcomePacket() []byte {
+	buf := &bytes.Buffer{}
+
 	s.Random = [32]byte{}
 	rec := Record{
 		Type:    RecordTypeHandshake,
 		Version: Version12,
 		Data:    &s,
 	}
-	buf := bytes.NewBuffer(rec.Bytes())
+	rec.WriteBytes(buf)
 
 	recChangeCipher := Record{
 		Type:    RecordTypeChangeCipherSpec,
 		Version: Version12,
 		Data:    RawBytes([]byte{0x01}),
 	}
-	buf.Write(recChangeCipher.Bytes())
+	recChangeCipher.WriteBytes(buf)
 
 	hostCert := make([]byte, 1024+mrand.Intn(3092))
 	rand.Read(hostCert) // nolint: errcheck
@@ -43,7 +45,8 @@ func (s ServerHello) WelcomePacket() []byte {
 		Version: Version12,
 		Data:    RawBytes(hostCert),
 	}
-	buf.Write(recData.Bytes())
+	recData.WriteBytes(buf)
+
 	packet := buf.Bytes()
 
 	mac := hmac.New(sha256.New, config.C.Secret)

wrappers/stream/faketls.go

@@ -1,6 +1,7 @@
 package stream
 
 import (
+	"bytes"
 	"errors"
 	"fmt"
 	"net"
@@ -39,13 +40,19 @@ func (w *wrapperFakeTLS) WriteTimeout(p []byte, timeout time.Duration) (int, err
 func (w *wrapperFakeTLS) write(p []byte, writeFunc func([]byte) (int, error)) (int, error) {
 	sum := 0
 
+	buf := acquireBytesBuffer()
+	defer releaseBytesBuffer(buf)
+
 	for _, v := range tlstypes.MakeRecords(p) {
-		_, err := writeFunc(v.Bytes())
+		buf.Reset()
+		v.WriteBytes(buf)
+
+		_, err := writeFunc(buf.Bytes())
 		if err != nil {
 			return sum, err
 		}
 
-		sum += len(v.Data.Bytes())
+		sum += v.Data.Len()
 	}
 
 	return sum, nil
@@ -86,7 +93,10 @@ func NewFakeTLS(socket conntypes.StreamReadWriteCloser) conntypes.StreamReadWrit
 			switch rec.Type {
 			case tlstypes.RecordTypeChangeCipherSpec:
 			case tlstypes.RecordTypeApplicationData:
-				return rec.Data.Bytes(), nil
+				buf := &bytes.Buffer{}
+				rec.Data.WriteBytes(buf)
+
+				return buf.Bytes(), nil
 			default:
 				return nil, fmt.Errorf("unsupported record type %v", rec.Type)
 			}

wrappers/stream/mtproto_cipher.go

@@ -1,7 +1,6 @@
 package stream
 
 import (
-	"bytes"
 	"crypto/aes"
 	"crypto/cipher"
 	"crypto/md5"  // nolint: gosec
@@ -54,7 +53,9 @@ func mtprotoDeriveKeys(purpose mtprotoCipherPurpose,
 	resp *rpc.NonceResponse,
 	client, remote *net.TCPAddr,
 	secret []byte) ([]byte, []byte) {
-	message := bytes.Buffer{}
+	message := acquireBytesBuffer()
+	defer releaseBytesBuffer(message)
+
 	message.Write(resp.Nonce)   // nolint: gosec
 	message.Write(req.Nonce)    // nolint: gosec
 	message.Write(req.CryptoTS) // nolint: gosec

wrappers/stream/obfuscated2.go

@@ -1,11 +1,9 @@
 package stream
 
 import (
-	"bytes"
 	"crypto/cipher"
 	"fmt"
 	"net"
-	"sync"
 	"time"
 
 	"go.uber.org/zap"
@@ -13,23 +11,6 @@ import (
 	"github.com/9seconds/mtg/conntypes"
 )
 
-var (
-	poolWrapperObfuscated2WritePool = sync.Pool{
-		New: func() interface{} {
-			return &bytes.Buffer{}
-		},
-	}
-)
-
-func poolWrapperObfuscated2WritePoolAcquire() *bytes.Buffer {
-	return poolWrapperObfuscated2WritePool.Get().(*bytes.Buffer)
-}
-
-func poolWrapperObfuscated2WritePoolRelease(buf *bytes.Buffer) {
-	buf.Reset()
-	poolWrapperObfuscated2WritePool.Put(buf)
-}
-
 type wrapperObfuscated2 struct {
 	encryptor cipher.Stream
 	decryptor cipher.Stream
@@ -59,8 +40,8 @@ func (w *wrapperObfuscated2) Read(p []byte) (int, error) {
 }
 
 func (w *wrapperObfuscated2) WriteTimeout(p []byte, timeout time.Duration) (int, error) {
-	buffer := poolWrapperObfuscated2WritePoolAcquire()
+	buffer := acquireBytesBuffer()
-	defer poolWrapperObfuscated2WritePoolRelease(buffer)
+	defer releaseBytesBuffer(buffer)
 
 	buffer.Write(p)
 
@@ -72,8 +53,8 @@ func (w *wrapperObfuscated2) WriteTimeout(p []byte, timeout time.Duration) (int,
 }
 
 func (w *wrapperObfuscated2) Write(p []byte) (int, error) {
-	buffer := poolWrapperObfuscated2WritePoolAcquire()
+	buffer := acquireBytesBuffer()
-	defer poolWrapperObfuscated2WritePoolRelease(buffer)
+	defer releaseBytesBuffer(buffer)
 
 	buffer.Write(p)
 

wrappers/stream/pools.go

@@ -0,0 +1,23 @@
+package stream
+
+import (
+	"bytes"
+	"sync"
+)
+
+var (
+	poolBytesBuffer = sync.Pool{
+		New: func() interface{} {
+			return &bytes.Buffer{}
+		},
+	}
+)
+
+func acquireBytesBuffer() *bytes.Buffer {
+	return poolBytesBuffer.Get().(*bytes.Buffer)
+}
+
+func releaseBytesBuffer(buf *bytes.Buffer) {
+	buf.Reset()
+	poolBytesBuffer.Put(buf)
+}