add bulk with go routines

sonic/connection.go

@@ -0,0 +1,84 @@
+package sonic
+
+import (
+	"bufio"
+	"bytes"
+	"errors"
+	"fmt"
+	"io"
+	"net"
+	"strings"
+)
+
+type connection struct {
+	reader *bufio.Reader
+	conn   net.Conn
+	closed bool
+}
+
+func newConnection(d *driver) (*connection, error) {
+	c := &connection{}
+	c.close()
+	conn, err := net.Dial("tcp", fmt.Sprintf("%s:%d", d.Host, d.Port))
+	if err != nil {
+		return nil, err
+	}
+
+	c.closed = false
+	c.conn = conn
+	c.reader = bufio.NewReader(c.conn)
+
+	err = c.write(fmt.Sprintf("START %s %s", d.channel, d.Password))
+	if err != nil {
+		return nil, err
+	}
+	_, err = c.read()
+	_, err = c.read()
+	if err != nil {
+		return nil, err
+	}
+	return c, nil
+}
+
+func (c *connection) read() (string, error) {
+	if c.closed {
+		return "", ErrClosed
+	}
+	buffer := bytes.Buffer{}
+	for {
+		line, isPrefix, err := c.reader.ReadLine()
+		buffer.Write(line)
+		if err != nil {
+			if err == io.EOF {
+				c.close()
+			}
+			return "", err
+		}
+		if !isPrefix {
+			break
+		}
+	}
+
+	str := buffer.String()
+	if strings.HasPrefix(str, "ERR ") {
+		return "", errors.New(str[4:])
+	}
+	return str, nil
+}
+
+func (c connection) write(str string) error {
+	if c.closed {
+		return ErrClosed
+	}
+	_, err := c.conn.Write([]byte(str + "\r\n"))
+	return err
+}
+
+func (c *connection) close() {
+	if c.conn != nil {
+		_ = c.conn.Close()
+		c.conn = nil
+	}
+	c.closed = true
+	c.reader = nil
+}