Fix leaking go routine issue

transport/http_transport.go

@@ -4,10 +4,12 @@ import (
 	"bufio"
 	"bytes"
 	"errors"
+	"io"
 	"io/ioutil"
 	"net"
 	"net/http"
 	"net/url"
+	"sync"
 )
 
 type httpTransport struct{}
@@ -19,6 +21,7 @@ type httpTransportClient struct {
 	buff     *bufio.Reader
 	dialOpts dialOptions
 	r        chan *http.Request
+	once     sync.Once
 }
 
 type httpTransportSocket struct {
@@ -63,7 +66,11 @@ func (h *httpTransportClient) Send(m *Message) error {
 func (h *httpTransportClient) Recv(m *Message) error {
 	var r *http.Request
 	if !h.dialOpts.stream {
-		r = <-h.r
+		rc, ok := <-h.r
+		if !ok {
+			return io.EOF
+		}
+		r = rc
 	}
 
 	rsp, err := http.ReadResponse(h.buff, r)
@@ -96,6 +103,9 @@ func (h *httpTransportClient) Recv(m *Message) error {
 
 func (h *httpTransportClient) Close() error {
 	h.buff.Reset(nil)
+	h.once.Do(func() {
+		close(h.r)
+	})
 	return h.conn.Close()
 }