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ssdbclient.go
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ssdbclient.go
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package gossdb
import (
"bytes"
"encoding/json"
"fmt"
"net"
"strconv"
"time"
"github.com/seefan/goerr"
)
const (
ENDN = '\n'
ENDR = '\r'
)
type SSDBClient struct {
isOpen bool
Password string
Host string
Port int
client *Client
sock *net.TCPConn
readBuf []byte
//packetBuf bytes.Buffer
//连接写缓冲,默认为8k,单位为kb
WriteBufferSize int
//连接读缓冲,默认为8k,单位为kb
ReadBufferSize int
//是否重试
RetryEnabled bool
//读写超时
ReadWriteTimeout int
//0时间
timeZero time.Time
//创建连接的超时时间,单位为秒。默认值: 5
ConnectTimeout int
}
//打开连接
func (s *SSDBClient) Start() error {
conn, err := net.DialTimeout("tcp", fmt.Sprintf("%s:%d", s.Host, s.Port), time.Second)
if err != nil {
return err
}
sock := conn.(*net.TCPConn)
err = sock.SetReadBuffer(s.ReadBufferSize * 1024)
if err != nil {
return err
}
err = sock.SetWriteBuffer(s.WriteBufferSize * 1024)
if err != nil {
return err
}
s.readBuf = make([]byte, s.ReadBufferSize*1024)
s.sock = sock
s.timeZero = time.Time{}
s.isOpen = true
return nil
}
//关闭连接
func (s *SSDBClient) Close() error {
s.isOpen = false
s.readBuf = nil
return s.sock.Close()
}
//是否为打开状态
func (s *SSDBClient) IsOpen() bool {
return s.isOpen
}
//状态检查
func (s *SSDBClient) Ping() bool {
_, err := s.Do("info")
return err == nil
}
//执行ssdb命令
func (s *SSDBClient) do(args ...interface{}) ([]string, error) {
if !s.isOpen {
return nil, goerr.New("gossdb client is closed.")
}
err := s.send(args)
if err != nil {
return nil, goerr.NewError(err, "client send error")
}
if resp, err := s.Recv(); err != nil {
return nil, goerr.NewError(err, "client recv error")
} else {
return resp, nil
}
}
//通用调用方法,如果有需要在所有方法前执行的,可以在这里执行
func (s *SSDBClient) Do(args ...interface{}) ([]string, error) {
if s.Password != "" {
resp, err := s.do("auth", []string{s.Password})
if err != nil {
if e := s.Close(); e != nil {
err = goerr.NewError(e, "client close failed")
}
return nil, goerr.NewError(err, "authentication failed")
}
if len(resp) > 0 && resp[0] == OK {
//验证成功
s.Password = ""
} else {
return nil, goerr.New("Authentication failed,password is wrong")
}
}
resp, err := s.do(args...)
if err != nil {
if e := s.Close(); e != nil {
err = goerr.NewError(e, "client close failed")
}
if s.RetryEnabled { //如果允许重试,就重新打开一次连接
if err = s.Start(); err == nil {
resp, err = s.do(args...)
if err != nil {
if e := s.Close(); e != nil {
err = goerr.NewError(e, "client close failed")
}
}
}
}
}
return resp, err
}
//发送数据
func (s *SSDBClient) Send(args ...interface{}) error {
if err := s.send(args); err != nil {
if e := s.Close(); e != nil {
err = goerr.NewError(e, "client close failed")
}
return err
}
return nil
}
//发送数据
func (s *SSDBClient) send(args []interface{}) error {
var packetBuf bytes.Buffer
for _, arg := range args {
switch arg := arg.(type) {
case string:
packetBuf.Write(strconv.AppendInt(nil, int64(len(arg)), 10))
packetBuf.WriteByte(ENDN)
packetBuf.WriteString(arg)
case []string:
for _, a := range arg {
packetBuf.Write(strconv.AppendInt(nil, int64(len(a)), 10))
packetBuf.WriteByte(ENDN)
packetBuf.WriteString(a)
packetBuf.WriteByte(ENDN)
}
continue
case []byte:
packetBuf.Write(strconv.AppendInt(nil, int64(len(arg)), 10))
packetBuf.WriteByte(ENDN)
packetBuf.Write(arg)
case int:
bs := strconv.AppendInt(nil, int64(arg), 10)
packetBuf.Write(strconv.AppendInt(nil, int64(len(bs)), 10))
packetBuf.WriteByte(ENDN)
packetBuf.Write(bs)
case int8:
bs := strconv.AppendInt(nil, int64(arg), 10)
packetBuf.Write(strconv.AppendInt(nil, int64(len(bs)), 10))
packetBuf.WriteByte(ENDN)
packetBuf.Write(bs)
case int16:
bs := strconv.AppendInt(nil, int64(arg), 10)
packetBuf.Write(strconv.AppendInt(nil, int64(len(bs)), 10))
packetBuf.WriteByte(ENDN)
packetBuf.Write(bs)
case int32:
bs := strconv.AppendInt(nil, int64(arg), 10)
packetBuf.Write(strconv.AppendInt(nil, int64(len(bs)), 10))
packetBuf.WriteByte(ENDN)
packetBuf.Write(bs)
case int64:
bs := strconv.AppendInt(nil, arg, 10)
packetBuf.Write(strconv.AppendInt(nil, int64(len(bs)), 10))
packetBuf.WriteByte(ENDN)
packetBuf.Write(bs)
case uint8:
bs := strconv.AppendUint(nil, uint64(arg), 10)
packetBuf.Write(strconv.AppendInt(nil, int64(len(bs)), 10))
packetBuf.WriteByte(ENDN)
packetBuf.Write(bs)
case uint16:
bs := strconv.AppendUint(nil, uint64(arg), 10)
packetBuf.Write(strconv.AppendInt(nil, int64(len(bs)), 10))
packetBuf.WriteByte(ENDN)
packetBuf.Write(bs)
case uint32:
bs := strconv.AppendUint(nil, uint64(arg), 10)
packetBuf.Write(strconv.AppendInt(nil, int64(len(bs)), 10))
packetBuf.WriteByte(ENDN)
packetBuf.Write(bs)
case uint64:
bs := strconv.AppendUint(nil, uint64(arg), 10)
packetBuf.Write(strconv.AppendInt(nil, int64(len(bs)), 10))
packetBuf.WriteByte(ENDN)
packetBuf.Write(bs)
case float32:
bs := strconv.AppendFloat(nil, float64(arg), 'g', -1, 32)
packetBuf.Write(strconv.AppendInt(nil, int64(len(bs)), 10))
packetBuf.WriteByte(ENDN)
packetBuf.Write(bs)
case float64:
bs := strconv.AppendFloat(nil, arg, 'g', -1, 64)
packetBuf.Write(strconv.AppendInt(nil, int64(len(bs)), 10))
packetBuf.WriteByte(ENDN)
packetBuf.Write(bs)
case bool:
packetBuf.WriteByte(1)
packetBuf.WriteByte(ENDN)
if arg {
packetBuf.WriteByte(1)
} else {
packetBuf.WriteByte(0)
}
case time.Time:
bs := strconv.AppendInt(nil, arg.Unix(), 10)
packetBuf.Write(strconv.AppendInt(nil, int64(len(bs)), 10))
packetBuf.WriteByte(ENDN)
packetBuf.Write(bs)
case time.Duration:
bs := strconv.AppendInt(nil, arg.Nanoseconds(), 10)
packetBuf.Write(strconv.AppendInt(nil, int64(len(bs)), 10))
packetBuf.WriteByte(ENDN)
packetBuf.Write(bs)
case nil:
packetBuf.WriteByte(0)
packetBuf.WriteByte(ENDN)
packetBuf.WriteString("")
default:
if Encoding {
if bs, err := json.Marshal(arg); err == nil {
packetBuf.Write(strconv.AppendInt(nil, int64(len(bs)), 10))
packetBuf.WriteByte(ENDN)
packetBuf.Write(bs)
} else {
return fmt.Errorf("bad arguments type,can not json marshal")
}
} else {
return fmt.Errorf("bad arguments type")
}
}
packetBuf.WriteByte(ENDN)
}
packetBuf.WriteByte(ENDN)
if err := s.sock.SetWriteDeadline(time.Now().Add(time.Second * time.Duration(s.ReadWriteTimeout))); err != nil {
return err
}
for _, err := packetBuf.WriteTo(s.sock); packetBuf.Len() > 0; {
if err != nil {
packetBuf.Reset()
return goerr.NewError(err, "client socket write error")
}
}
//设置不超时
if err := s.sock.SetWriteDeadline(s.timeZero); err != nil {
return err
}
packetBuf.Reset()
return nil
}
//接收数据
func (s *SSDBClient) Recv() (resp []string, err error) {
bufSize := 0
packetBuf := []byte{}
//设置读取数据超时,
if err = s.sock.SetReadDeadline(time.Now().Add(time.Second * time.Duration(s.ReadWriteTimeout))); err != nil {
return nil, err
}
//数据包分解,发现长度,找到结尾,循环发现,发现空行,结束
for {
bufSize, err = s.sock.Read(s.readBuf)
if err != nil {
return nil, goerr.NewError(err, "client socket read error")
}
if bufSize < 1 {
continue
}
packetBuf = append(packetBuf, s.readBuf[:bufSize]...)
for {
rsp, n := s.parse(packetBuf)
if n == -1 {
break
} else if n == -2 {
return
} else {
resp = append(resp, rsp)
packetBuf = packetBuf[n+1:]
}
}
}
packetBuf = nil
//设置不超时
if err = s.sock.SetReadDeadline(s.timeZero); err != nil {
return nil, err
}
return resp, nil
}
//解析数据为string的slice
func (s *SSDBClient) parse(buf []byte) (resp string, size int) {
n := bytes.IndexByte(buf, ENDN)
blockSize := -1
size = -1
if n != -1 {
if n == 0 || n == 1 && buf[0] == ENDR { //空行,说明一个数据包结束
size = -2
return
}
//数据包开始,包长度解析
blockSize = ToNum(buf[:n])
bufSize := len(buf)
if n+blockSize < bufSize {
resp = string(buf[n+1 : blockSize+n+1])
for i := blockSize + n + 1; i < bufSize; i++ {
if buf[i] == ENDN {
size = i
return
}
}
}
}
return
}