add mempool

client.go

@@ -15,8 +15,11 @@ import (
 	"net/http"
 	"strconv"
 	"strings"
+	//"sync/atomic"
 )
 
+var sessionCount int64
+
 func listenAndServe(addr string, handler func(net.Conn)) error {
 	laddr, err := net.ResolveTCPAddr("tcp", addr)
 	if err != nil {
@@ -45,7 +48,10 @@ func handshake(conn net.Conn, methods ...uint8) (method uint8, err error) {
 	if nm == 0 {
 		nm = 1
 	}
-	b := make([]byte, 2+nm)
+	b := spool.Take()
+	defer spool.put(b)
+
+	b = b[:2+nm]
 	b[0] = gosocks5.Ver5
 	b[1] = uint8(nm)
 	copy(b[2:], methods)
@@ -68,6 +74,12 @@ func handshake(conn net.Conn, methods ...uint8) (method uint8, err error) {
 
 func cliHandle(conn net.Conn) {
 	defer conn.Close()
+	/*
+		fmt.Println("new session", atomic.AddInt64(&sessionCount, 1))
+		defer func() {
+			fmt.Println("session end", atomic.AddInt64(&sessionCount, -1))
+		}()
+	*/
 
 	sconn, err := Connect(Saddr, Proxy)
 	if err != nil {
@@ -105,7 +117,9 @@ func cliHandle(conn net.Conn) {
 		return
 	}
 
-	b := make([]byte, 8192)
+	b := mpool.Take()
+	defer mpool.put(b)
+
 	n, err := io.ReadAtLeast(conn, b, 2)
 	if err != nil {
 		log.Println(err)
@@ -197,7 +211,9 @@ func cliTunnelUDP(uconn *net.UDPConn, sconn net.Conn) {
 	var raddr *net.UDPAddr
 
 	go func() {
-		b := make([]byte, 65535)
+		b := lpool.Take()
+		defer lpool.put(b)
+
 		for {
 			n, addr, err := uconn.ReadFromUDP(b)
 			if err != nil {
@@ -221,6 +237,9 @@ func cliTunnelUDP(uconn *net.UDPConn, sconn net.Conn) {
 	}()
 
 	for {
+		b := lpool.Take()
+		defer lpool.put(b)
+
 		udp, err := gosocks5.ReadUDPDatagram(sconn)
 		if err != nil {
 			log.Println(err)
@@ -228,7 +247,7 @@ func cliTunnelUDP(uconn *net.UDPConn, sconn net.Conn) {
 		}
 		//log.Println("w", udp.Header)
 		udp.Header.Rsv = 0
-		buf := &bytes.Buffer{}
+		buf := bytes.NewBuffer(b[0:0])
 		udp.Write(buf)
 		if _, err := uconn.WriteTo(buf.Bytes(), raddr); err != nil {
 			log.Println(err)
@@ -331,7 +350,9 @@ func getShadowRequest(conn net.Conn) (addr *gosocks5.Addr, extra []byte, err err
 	// buf size should at least have the same size with the largest possible
 	// request size (when addrType is 3, domain name has at most 256 bytes)
 	// 1(addrType) + 1(lenByte) + 256(max length address) + 2(port)
-	buf := make([]byte, 260)
+	buf := spool.Take()
+	defer spool.put(buf)
+
 	var n int
 	// read till we get possible domain length field
 	//shadowsocks.SetReadTimeout(conn)

main.go

@@ -5,6 +5,7 @@ import (
 	"flag"
 	"github.com/ginuerzh/gosocks5"
 	"log"
+	"time"
 )
 
 var (
@@ -31,6 +32,12 @@ func init() {
 	log.SetFlags(log.LstdFlags | log.Lshortfile)
 }
 
+var (
+	spool = NewMemPool(1024, 120*time.Minute, 1024)  // 1k size buffer pool
+	mpool = NewMemPool(16*1024, 60*time.Minute, 512) // 16k size buffer pool
+	lpool = NewMemPool(32*1024, 30*time.Minute, 256) // 32k size buffer pool
+)
+
 func main() {
 	//log.Fatal(gost.Run())
 	if len(Saddr) == 0 {

pool.go

+// pool for buffer
+package main
+
+import (
+	"container/list"
+	//"log"
+	"time"
+)
+
+type poolItem struct {
+	when time.Time
+	item interface{}
+}
+
+type pool struct {
+	quque             *list.List
+	takeChan, putChan chan interface{}
+	age               time.Duration
+	max               int
+}
+
+func (p *pool) run() {
+	for {
+		if p.size() == 0 {
+			select {
+			case b := <-p.putChan:
+				p.put(b)
+			}
+			continue
+		}
+
+		i := p.quque.Front()
+		timeout := time.NewTimer(p.age)
+
+		select {
+		case b := <-p.putChan:
+			timeout.Stop()
+			p.put(b)
+		case p.takeChan <- i.Value.(*poolItem).item:
+			timeout.Stop()
+			p.quque.Remove(i)
+		case <-timeout.C:
+			i = p.quque.Back()
+			for i != nil {
+				if time.Since(i.Value.(*poolItem).when) < p.age {
+					break
+				}
+				e := i.Prev()
+				p.quque.Remove(i)
+				i = e
+			}
+		}
+	}
+}
+
+func (p *pool) size() int {
+	return p.quque.Len()
+}
+
+func (p *pool) put(v interface{}) {
+	if p.size() < p.max {
+		p.quque.PushFront(&poolItem{when: time.Now(), item: v})
+		return
+	}
+}
+
+type MemPool struct {
+	pool
+	bs int
+}
+
+func NewMemPool(bs int, age time.Duration, max int) *MemPool {
+	if bs <= 0 {
+		bs = 8192
+	}
+
+	if age == 0 {
+		age = 1 * time.Minute
+	}
+
+	p := &MemPool{
+		pool: pool{
+			quque:    list.New(),
+			takeChan: make(chan interface{}),
+			putChan:  make(chan interface{}),
+			age:      age,
+			max:      max,
+		},
+		bs: bs,
+	}
+
+	go p.run()
+
+	return p
+}
+
+func (p *MemPool) Take() []byte {
+	select {
+	case v := <-p.takeChan:
+		return v.([]byte)
+	default:
+		return make([]byte, p.bs)
+	}
+}
+
+func (p *MemPool) Put(b []byte) {
+	p.putChan <- b
+}

server.go

@@ -124,7 +124,9 @@ func srvHandle(conn net.Conn) {
 
 func srvTunnelUDP(conn net.Conn, uconn *net.UDPConn) {
 	go func() {
-		b := make([]byte, 65535)
+		b := lpool.Take()
+		defer lpool.put(b)
+
 		for {
 			n, addr, err := uconn.ReadFromUDP(b)
 			if err != nil {

util.go

@@ -100,7 +100,9 @@ func Connect(addr, proxy string) (net.Conn, error) {
 
 // based on io.Copy
 func Copy(dst io.Writer, src io.Reader) (written int64, err error) {
-	buf := make([]byte, 32*1024)
+	buf := lpool.Take()
+	defer lpool.put(buf)
+
 	for {
 		nr, er := src.Read(buf)
 		//log.Println("cp r", nr, er)