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ssdb_client.go
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ssdb_client.go
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//Package ssdbclient Establish a connection with SSDB, parse the data and convert it into a regular format
//
//与ssdb建立连接,对数据进行解析,转换成常规格式
package ssdbclient
import (
"bytes"
"errors"
"fmt"
"net"
"runtime"
"strconv"
"time"
"github.com/seefan/goerr"
"github.com/seefan/gossdb/v2/conf"
)
const (
endN = '\n'
endR = '\r'
oK = "ok"
)
//NewSSDBClient create new ssdb client
//
// @param cfg initial parameters
// @return new *SSDBClient
//
//使用配置创建一个新的SSDBClient,并不实际打开连接
func NewSSDBClient(cfg *conf.Config) *SSDBClient {
return &SSDBClient{
host: cfg.Host,
port: cfg.Port,
password: cfg.Password,
readTimeout: cfg.ReadTimeout,
writeTimeout: cfg.WriteTimeout,
readBufferSize: cfg.ReadBufferSize,
writeBufferSize: cfg.WriteBufferSize,
retryEnabled: cfg.RetryEnabled,
connectTimeout: cfg.ConnectTimeout,
encoding: cfg.Encoding,
}
}
//SSDBClient ssdb client
type SSDBClient struct {
//是否重试
retryEnabled bool
//是否自动转码
encoding bool
//whether the connection is open
isOpen bool
////whether the connection is authorization
//isAuth bool
//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
//写超时
writeTimeout int
//读超时
readTimeout int
//创建连接的超时时间,单位为秒。默认值: 5
connectTimeout int
//ssdb port
port int
//bufSize
bufSize int
//tmpSize
offset int
//0时间
timeZero time.Time
//connection token
password string
//host ssdb host
host string
//connection
sock *net.TCPConn
//readBuf
buf []byte
//The input parameter is converted to [] bytes, which by default is converted to json format
//and can be modified to use a custom serialization
//将输入参数成[]byte,默认会转换成json格式,可以修改这个参数以便使用自定义的序列化方式
EncodingFunc func(v interface{}) []byte
//dialer
dialer *net.Dialer
}
//Start start socket
//
// @return error that may occur on startup. Return nil if successful startup
//
//启动连接,并设置读写的缓存
func (s *SSDBClient) Start() error {
if s.dialer == nil {
s.dialer = &net.Dialer{Timeout: time.Second * time.Duration(s.connectTimeout)}
}
conn, err := s.dialer.Dial("tcp", fmt.Sprintf("%s:%d", s.host, s.port))
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.bufSize = (s.readBufferSize + s.writeBufferSize) * 1024
s.buf = make([]byte, s.bufSize)
s.sock = sock
s.timeZero = time.Time{}
s.isOpen = true
return s.auth()
}
//Close close SSDBClient
//
// @return error that may occur on shutdown. Return nil if successful shutdown
func (s *SSDBClient) Close() error {
s.isOpen = false
s.buf = nil
if s.sock == nil {
return nil
}
return s.sock.Close()
}
//IsOpen check if the connection is open
//
// @return bool returns true if the connection is open
//
//是否为打开状态
func (s *SSDBClient) IsOpen() bool {
return s.isOpen
}
//执行ssdb命令
func (s *SSDBClient) do(args ...interface{}) (resp []string, err error) {
if !s.isOpen {
return nil, goerr.String("gossdb client is closed.")
}
defer func() {
if e := recover(); e != nil {
s.isOpen = false
err = fmt.Errorf("%v", e)
}
}()
if err = s.send(args); err != nil {
s.isOpen = false
return nil, goerr.Errorf(err, "client send error")
}
if resp, err = s.recv(); err != nil {
s.isOpen = false
return nil, goerr.Errorf(err, "client recv error")
}
return
}
func (s *SSDBClient) auth() error {
if s.password == "" { //without a password, authentication is not required
return nil
}
//if !s.isAuth {
resp, err := s.do("auth", s.password)
if err != nil {
if e := s.Close(); e != nil {
err = goerr.Errorf(err, "client close failed")
}
return goerr.Errorf(err, "authentication failed")
}
if len(resp) > 0 && resp[0] == oK {
//验证成功
//s.isAuth = true
return nil
}
return goerr.String("authentication failed,password is wrong")
//}
//return nil
}
//Do common function
//
// @param args the input parameters
// @return []string output parameters
// @return error Possible errors
//
//通用调用方法,所有操作ssdb的函数最终都是调用这个函数
func (s *SSDBClient) Do(args ...interface{}) ([]string, error) {
//if err := s.auth(); err != nil {
// return nil, err
//}
resp, err := s.do(args...)
if err != nil {
if e := s.Close(); e != nil {
err = goerr.Errorf(err, "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.Errorf(err, "client close failed")
}
}
}
}
}
return resp, err
}
//write write to buf
func (s *SSDBClient) writeBytes(bs []byte) error {
lbs := strconv.AppendInt(nil, int64(len(bs)), 10)
if err := s.write(lbs, len(lbs)); err != nil {
return err
}
if err := s.write([]byte{endN}, 1); err != nil {
return err
}
if err := s.write(bs, len(bs)); err != nil {
return err
}
if err := s.write([]byte{endN}, 1); err != nil {
return err
}
return nil
}
func (s *SSDBClient) write(bs []byte, size int) error {
if s.offset+size < s.bufSize {
copy(s.buf[s.offset:], bs)
s.offset += size
return nil
}
err := s.writeSocket(s.buf[:s.offset], s.offset)
if err != nil {
return err
}
s.offset = 0
err = s.writeSocket(bs, size)
if err != nil {
return err
}
return nil
}
func (s *SSDBClient) writeSocket(bs []byte, size int) error {
wn := 0
for {
n, err := s.sock.Write(bs)
if err != nil {
return err
}
if n == size || wn+n == size {
return nil
}
wn += n
runtime.Gosched()
}
}
//send cmd to ssdb
func (s *SSDBClient) send(args []interface{}) (err error) {
if err = s.sock.SetWriteDeadline(time.Now().Add(time.Second * time.Duration(s.writeTimeout))); err != nil {
return err
}
s.offset = 0
for _, arg := range args {
switch arg := arg.(type) {
case string:
err = s.writeBytes([]byte(arg))
case []byte:
err = s.writeBytes(arg)
case int:
bs := strconv.AppendInt(nil, int64(arg), 10)
err = s.writeBytes(bs)
case int8:
err = s.writeBytes([]byte{byte(arg)})
case int16:
bs := strconv.AppendInt(nil, int64(arg), 10)
err = s.writeBytes(bs)
case int32:
bs := strconv.AppendInt(nil, int64(arg), 10)
err = s.writeBytes(bs)
case int64:
bs := strconv.AppendInt(nil, arg, 10)
err = s.writeBytes(bs)
case uint8:
err = s.writeBytes([]byte{byte(arg)})
case uint16:
bs := strconv.AppendUint(nil, uint64(arg), 10)
err = s.writeBytes(bs)
case uint32:
bs := strconv.AppendUint(nil, uint64(arg), 10)
err = s.writeBytes(bs)
case uint64:
bs := strconv.AppendUint(nil, arg, 10)
err = s.writeBytes(bs)
case float32:
bs := strconv.AppendFloat(nil, float64(arg), 'g', -1, 32)
err = s.writeBytes(bs)
case float64:
bs := strconv.AppendFloat(nil, arg, 'g', -1, 64)
err = s.writeBytes(bs)
case bool:
if arg {
err = s.writeBytes([]byte{'1'})
} else {
err = s.writeBytes([]byte{'0'})
}
case time.Time:
bs := strconv.AppendInt(nil, arg.Unix(), 10)
err = s.writeBytes(bs)
case time.Duration:
bs := strconv.AppendInt(nil, arg.Nanoseconds(), 10)
err = s.writeBytes(bs)
case nil:
err = s.writeBytes([]byte{})
default:
if s.encoding && s.EncodingFunc != nil {
err = s.writeBytes(s.EncodingFunc(arg))
} else {
return errors.New("bad arguments type")
}
}
if err != nil {
return err
}
}
if s.offset < s.bufSize {
s.buf[s.offset] = endN
s.offset++
if s.offset < s.bufSize {
err = s.writeSocket(s.buf[:s.offset], s.offset)
} else {
err = s.writeSocket(s.buf[:], s.bufSize)
}
} else {
if err = s.writeSocket(s.buf[:s.offset], s.offset); err == nil {
err = s.writeSocket([]byte{endN}, 1)
}
}
if err != nil {
return err
}
//设置不超时
if err = s.sock.SetWriteDeadline(s.timeZero); err != nil {
return err
}
return nil
}
//接收数据
func (s *SSDBClient) recv() (resp []string, err error) {
//设置读取数据超时,
if err = s.sock.SetReadDeadline(time.Now().Add(time.Second * time.Duration(s.readTimeout))); err != nil {
return nil, err
}
resp, err = s.parse()
if err != nil {
return nil, err
}
//设置不超时
if err = s.sock.SetReadDeadline(s.timeZero); err != nil {
return nil, err
}
return resp, nil
}
//parse 解析数据为string的slice
func (s *SSDBClient) parse() (resp []string, err error) {
var blockSize, bufSize, status, offset int
var rs []string
//如何一次读取就可以解析完成,就不需要使用bytes.Buffer
bufSize, err = s.sock.Read(s.buf)
if err != nil {
return nil, err
}
if bufSize > 0 {
rs, status, blockSize, offset = s.parseBuffer(s.buf[:bufSize])
if status == 1 { //解析完成
resp = append(resp, rs...)
return
} else if offset > 0 {
resp = append(resp, rs...)
}
}
//大数据量读取
var bs bytes.Buffer
bs.Write(s.buf[offset:bufSize])
for {
bufSize, err = s.sock.Read(s.buf)
if err != nil {
return nil, err
}
if bufSize == 0 {
runtime.Gosched()
continue //no data
}
bs.Write(s.buf[:bufSize])
if bs.Len() < blockSize { //数据不足,补充数据
continue
}
rs, status, blockSize, offset = s.parseBuffer(bs.Bytes())
if status == 0 { //数据不足,补充数据
continue
} else if status == 1 { //解析完成
if offset > 0 {
resp = append(resp, rs...)
}
break
} else {
resp = append(resp, rs...)
bs.Next(offset)
}
}
bs.Reset()
return
}
//parseBuffer 数据包分解,发现长度,找到结尾,循环发现,发现空行,结束
func (s *SSDBClient) parseBuffer(buf []byte) (resp []string, status int, blockSize int, offset int) {
delim := 1
bufSize := len(buf)
var n int
for {
n = bytes.IndexByte(buf[offset:], endN)
if n == -1 { //没有数据
return
}
if n == 0 || n == 1 && buf[offset] == endR { //空行,说明一个数据包结束
status = 1 //结束
return
}
//数据包开始,包长度解析
blockSize = toNum(buf[offset : offset+n])
if buf[offset+n] == endR {
delim = 2
}
n++ //add \n
if offset+n+blockSize+delim >= bufSize {
status = -1
blockSize = n + blockSize + delim
return
}
resp = append(resp, string(buf[offset+n:offset+n+blockSize]))
offset = offset + n + blockSize + delim
}
}