api: make DeadlineIO private

Part of #158

CHANGELOG.md

@@ -27,6 +27,7 @@ Versioning](http://semver.org/spec/v2.0.0.html) except to the first release.
 - multi subpackage (#240)
 - msgpack.v2 support (#236)
 - pool/RoundRobinStrategy (#158)
+- DeadlineIO (#158)
 
 ### Fixed
 

deadline_io.go

@@ -5,20 +5,20 @@ import (
 	"time"
 )
 
-type DeadlineIO struct {
+type deadlineIO struct {
 	to time.Duration
 	c  net.Conn
 }
 
-func (d *DeadlineIO) Write(b []byte) (n int, err error) {
+func (d *deadlineIO) Write(b []byte) (n int, err error) {
 	if d.to > 0 {
 		d.c.SetWriteDeadline(time.Now().Add(d.to))
 	}
 	n, err = d.c.Write(b)
 	return
 }
 
-func (d *DeadlineIO) Read(b []byte) (n int, err error) {
+func (d *deadlineIO) Read(b []byte) (n int, err error) {
 	if d.to > 0 {
 		d.c.SetReadDeadline(time.Now().Add(d.to))
 	}

dial.go

@@ -111,7 +111,7 @@ func (t TtDialer) Dial(address string, opts DialOpts) (Conn, error) {
 		return nil, fmt.Errorf("failed to dial: %w", err)
 	}
 
-	dc := &DeadlineIO{to: opts.IoTimeout, c: conn.net}
+	dc := &deadlineIO{to: opts.IoTimeout, c: conn.net}
 	conn.reader = bufio.NewReaderSize(dc, 128*1024)
 	conn.writer = bufio.NewWriterSize(dc, 128*1024)