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conn.go
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conn.go
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package proxy
import (
"bufio"
"bytes"
"errors"
"fmt"
"io"
"net"
"strings"
"time"
)
type Conn struct {
config Config
stats commandStats
conn *net.TCPConn
r io.Reader
w io.Writer
}
type commandStats struct {
count int64
success int64
fail int64
}
func NewConn(config Config) *Conn {
return &Conn{
config: config,
}
}
func (c *Conn) Connect() error {
var dialer = &net.Dialer{
Timeout: c.config.DialerTimeout,
}
conn, err := dialer.Dial("tcp", c.config.ClusterAddrs[0])
if err != nil {
return err
}
c.conn = conn.(*net.TCPConn)
c.r = bufio.NewReader(c.conn)
c.w = bufio.NewWriter(c.conn)
if err = c.WriteCommand(PING()); err != nil {
return err
}
var protResp *Resp
protResp, err = c.ReadResponse()
if err != nil {
return err
}
// 检查ping命令响应是否ok
if protResp.Type != RespTypeSimpleString || !bytes.Equal(protResp.State, []byte("PONG")) {
return errors.New("backend redis error: ping failure")
}
return nil
}
func (c *Conn) ReadResponse() (*Resp, error) {
br := c.r.(*bufio.Reader)
buf, err := br.ReadBytes('\n')
if err != nil {
return nil, err
}
bufLen := len(buf)
if bufLen < 4 {
return nil, errors.New("invalid response")
}
return ParseResp(br, buf[0:bufLen-2])
}
func (c *Conn) Write(p []byte) (int, error) {
c.conn.SetWriteDeadline(time.Now().Add(c.config.WriteTimeout))
return c.w.Write(p)
}
func (c *Conn) Read(p []byte) (int, error) {
c.conn.SetReadDeadline(time.Now().Add(c.config.ReadTimeout))
return c.r.Read(p)
}
func (c *Conn) WriteCommand(cmd *Command) error {
_, err := cmd.WriteTo(c)
if err != nil {
return err
}
err = c.Flush()
if err != nil {
return err
}
return nil
}
type flusher interface {
Flush() error
}
func (c *Conn) Flush() error {
if f, ok := c.w.(flusher); ok {
return f.Flush()
}
return nil
}
func printBytesByHex(bytesToPrint []byte) {
group := make([]string, 0, len(bytesToPrint))
for i := 0; i < len(bytesToPrint); i = i + 1 {
group = append(group, fmt.Sprintf("%X", bytesToPrint[i:i+1]))
}
fmt.Printf("%s\n", strings.Join(group, " "))
}