/
conn.go
217 lines (178 loc) · 4.08 KB
/
conn.go
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package archer
import (
"bufio"
"bytes"
"errors"
"fmt"
"net"
"strconv"
"strings"
"time"
log "github.com/ngaut/logging"
)
var (
ClusterNodes = []byte("*2\r\n$7\r\nCLUSTER\r\n$5\r\nNODES\r\n") // cluster nodes
Ping = []byte("*1\r\n$4\r\nPING\r\n")
)
type RedisConn struct {
id string
c net.Conn
w *bufio.Writer
r *bufio.Reader
lastUsed time.Time
readTimeout time.Duration
writeTimeout time.Duration
closed bool
}
func NewRedisConn(host string, port int) (*RedisConn, error) {
conn := &RedisConn{}
c, err := net.Dial("tcp4", fmt.Sprintf("%s:%d", host, port))
if err != nil {
log.Fatalf("Backend Dial %s:%d failed %s", host, port, err)
}
conn.w = bufio.NewWriter(c)
conn.r = bufio.NewReader(c)
return conn, nil
}
func RedisConnDialer(host string, port int, id string, pc *ProxyConfig) func() (Conn, error) {
return func() (Conn, error) {
var c net.Conn
var err error
if pc.dialTimeout > 0 {
c, err = net.DialTimeout("tcp4", fmt.Sprintf("%s:%d", host, port), pc.dialTimeout*time.Second)
} else {
c, err = net.Dial("tcp4", fmt.Sprintf("%s:%d", host, port))
}
if err != nil {
log.Warning("RedisConnDialer failed ", err)
return nil, err
}
conn := &RedisConn{
id: id,
c: c,
w: bufio.NewWriter(c),
r: bufio.NewReader(c),
readTimeout: pc.readTimeout,
writeTimeout: pc.writeTimeout,
lastUsed: time.Now(),
}
return conn, nil
}
}
func (c *RedisConn) Close() error {
if c.closed {
return nil
}
if c.c != nil {
return c.c.Close()
}
return nil
}
func (c *RedisConn) Discard() error {
return nil
}
func (c *RedisConn) LastUsed() time.Time {
return c.lastUsed
}
func (c *RedisConn) SetLastUsed(t time.Time) {
c.lastUsed = t
}
func (c *RedisConn) ID() string {
return c.id
}
func (c *RedisConn) Alive() bool {
if c.Ping() {
return true
}
return false
}
func (c *RedisConn) Ping() bool {
_, err := c.w.Write(ClusterNodes)
if err != nil {
return false
}
err = c.w.Flush()
if err != nil {
return false
}
r, e := ReadProtocol(c.r)
if e != nil {
return false
}
sr, ok := r.(*SimpleResp)
if !ok {
return false
}
if bytes.Equal(sr.Args[0], PONG) {
return true
}
return false
}
func GetClusterNodes(host string, port int) ([]*Node, error) {
c, err := NewRedisConn(host, port)
if err != nil {
return nil, err
}
_, err = c.w.Write(ClusterNodes)
if err != nil {
return nil, err
}
err = c.w.Flush()
if err != nil {
return nil, err
}
r, e := ReadProtocol(c.r)
if e != nil {
return nil, e
}
br, ok := r.(*BulkResp)
if !ok {
return nil, errors.New("wrong resp type, respect BulkResp in GetClusterNodes")
}
if br.Empty {
return nil, errors.New("Cluster nodes Command failed")
}
lines := strings.Split(string(br.Args[0]), "\n")
// 96ea3677b33334fb27382a08e475571a48342db0 10.10.10.86:6592 slave 4382646a92a3949bb9fdcfdc5a383e5e4b20a849 0 1447149668244 57 connected
// 219dfcf127e995244a43a5d57d95ea5f55b69c07 10.10.10.96:6595 master - 0 1447149668743 44 connected 3736-3939
ns := make([]*Node, 0)
for _, l := range lines[:len(lines)-1] {
n := &Node{
serveSlot: new(SlotRange),
}
fields := strings.Fields(l)
log.Info("GetClusterNodes fields: ", len(fields), fields)
if len(fields) < 8 || len(fields) > 9 {
return nil, errors.New("Cluster nodes fileds wrong")
}
n.id = fields[1]
url := strings.Split(fields[1], ":")
if len(url) != 2 {
return nil, errors.New("cluster nodes url wrong")
}
n.host = url[0]
var err error
n.port, err = strconv.Atoi(url[1])
if err != nil {
return nil, errors.New("cluster nodes port wrong")
}
if strings.Contains(fields[2], "slave") {
n.role = "slave"
n.slaveOf = fields[3]
} else {
n.role = "master"
slot := strings.Split(fields[8], "-")
var err error
n.serveSlot.start, err = strconv.Atoi(slot[0])
if err != nil {
return nil, errors.New("cluster nodes serve slots wrong")
}
n.serveSlot.stop, err = strconv.Atoi(slot[1])
if err != nil {
return nil, errors.New("cluster nodes serve slots wrong")
}
}
ns = append(ns, n)
}
return ns, nil
}