/
go_ssdb_util.go
523 lines (465 loc) · 12.1 KB
/
go_ssdb_util.go
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// Copyright Fuzamei Corp. 2018 All Rights Reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package db
import (
"bytes"
"fmt"
"net"
"strconv"
"sync"
"time"
"github.com/assetcloud/chain/types"
)
// const
const (
ENDN = '\n'
ENDR = '\r'
OK = "ok"
NotFound = "not_found"
ReadTimeOut = 3
WriteTimeOut = 3
ReadBufSize = 8 * 1024
IteratorPageSize = 10240
PooledSize = 3
)
// SDBClient ...
type SDBClient struct {
sock *net.TCPConn
timeZero time.Time
mu sync.Mutex
}
// SDBPool SDB池
type SDBPool struct {
clients []*SDBClient
round *RoundInt
}
// RoundInt ...
type RoundInt struct {
round int
index int
}
func (val *RoundInt) incr() int {
val.index++
if val.index < val.round {
return val.index
}
val.index = 0
return val.index
}
func (pool *SDBPool) get() *SDBClient {
return pool.clients[pool.round.incr()]
}
func (pool *SDBPool) close() {
for _, v := range pool.clients {
err := v.Close()
dlog.Error("ssdb close ", "error", err)
}
}
// NewSDBPool new
func NewSDBPool(nodes []*SsdbNode) (pool *SDBPool, err error) {
dbpool := &SDBPool{}
for i := 0; i < PooledSize; i++ {
for _, v := range nodes {
db, err := Connect(v.ip, v.port)
if err != nil {
dlog.Error("connect to ssdb error!", "ssdb", v)
return dbpool, types.ErrDataBaseDamage
}
dbpool.clients = append(dbpool.clients, db)
}
}
dbpool.round = &RoundInt{round: PooledSize * len(nodes)}
return dbpool, nil
}
// Connect 连接
func Connect(ip string, port int) (*SDBClient, error) {
addr, err := net.ResolveTCPAddr("tcp", fmt.Sprintf("%s:%d", ip, port))
if err != nil {
return nil, err
}
sock, err := net.DialTCP("tcp", nil, addr)
if err != nil {
return nil, err
}
var c SDBClient
c.sock = sock
c.timeZero = time.Time{}
return &c, nil
}
// Get 获取指定 key 的值内容
//
// key 键值
// 返回 一个 Value,可以方便的向其它类型转换
// 返回 一个可能的错误,操作成功返回 nil
func (c *SDBClient) Get(key string) (*Value, error) {
resp, err := c.Do("get", key)
if err != nil {
return nil, newErrorf(err, "Get %s error", key)
}
if len(resp) == 0 {
return nil, newError("ssdb response error")
}
if len(resp) == 2 && resp[0] == OK {
return toValue(resp[1]), nil
}
return nil, makeError(resp, key)
}
// Set 设置指定 key 的值内容
//
// key 键值
// val 存贮的 value 值,val只支持基本的类型,如果要支持复杂的类型,需要开启连接池的 Encoding 选项
// ttl 可选,设置的过期时间,单位为秒
// 返回 err,可能的错误,操作成功返回 nil
func (c *SDBClient) Set(key string, val []byte) (err error) {
var resp []string
resp, err = c.Do("set", key, val)
if err != nil {
return newErrorf(err, "Set %s error", key)
}
if len(resp) > 0 && resp[0] == OK {
return nil
}
return makeError(resp, key)
}
// Del 删除指定 key
//
// key 要删除的 key
// 返回 err,执行的错误,操作成功返回 nil
func (c *SDBClient) Del(key string) error {
resp, err := c.Do("del", key)
if err != nil {
return newErrorf(err, "Del %s error", key)
}
//response looks like s: [ok 1]
if len(resp) > 0 && resp[0] == OK {
return nil
}
return makeError(resp, key)
}
// MultiSet 批量设置一批 key-value.
//
// 包含 key-value 的字典
// 返回 err,可能的错误,操作成功返回 nil
func (c *SDBClient) MultiSet(kvs map[string][]byte) (err error) {
args := []interface{}{"multi_set"}
for k, v := range kvs {
args = append(args, k)
args = append(args, v)
}
resp, err := c.Do(args...)
if err != nil {
return newErrorf(err, "MultiSet %s error", kvs)
}
if len(resp) > 0 && resp[0] == OK {
return nil
}
return makeError(resp, kvs)
}
// MultiDel 批量删除一批 key 和其对应的值内容.
//
// key,要删除的 key,可以为多个
// 返回 err,可能的错误,操作成功返回 nil
func (c *SDBClient) MultiDel(key ...string) (err error) {
if len(key) == 0 {
return nil
}
args := []interface{}{"multi_del"}
for _, v := range key {
args = append(args, v)
}
resp, err := c.Do(args...)
if err != nil {
return newErrorf(err, "MultiDel %s error", key)
}
if len(resp) > 0 && resp[0] == OK {
return nil
}
return makeError(resp, key)
}
// MultiGet 批量删除一批 key 和其对应的值内容.
//
// key,要删除的 key,可以为多个
// 返回 err,可能的错误,操作成功返回 nil
func (c *SDBClient) MultiGet(key ...string) (vals []*Value, err error) {
if len(key) == 0 {
return nil, nil
}
data := []interface{}{"multi_get"}
for _, k := range key {
data = append(data, k)
}
resp, err := c.Do(data...)
if err != nil {
return nil, newErrorf(err, "MultiGet %s error", key)
}
size := len(resp)
if size > 0 && resp[0] == OK {
for i := 1; i < size && i+1 < size; i += 2 {
vals = append(vals, toValue(resp[i+1]))
}
return vals, nil
}
return nil, makeError(resp, key)
}
// Keys 列出处于区间 (key_start, key_end] 的 key 列表.("", ""] 表示整个区间.
//
// keyStart int 返回的起始 key(不包含), 空字符串表示 -inf.
// keyEnd int 返回的结束 key(包含), 空字符串表示 +inf.
// limit int 最多返回这么多个元素.
// 返回 返回包含 key 的数组.
// 返回 err,可能的错误,操作成功返回 nil
func (c *SDBClient) Keys(keyStart, keyEnd string, limit int64) ([]string, error) {
resp, err := c.Do("keys", keyStart, keyEnd, limit)
if err != nil {
return nil, newErrorf(err, "Keys [%s,%s] %d error", keyStart, keyEnd, limit)
}
if len(resp) > 0 && resp[0] == OK {
return resp[1:], nil
}
return nil, makeError(resp, keyStart, keyEnd, limit)
}
// Rkeys 列出处于区间 (key_start, key_end] 的 key 列表.("", ""] 表示整个区间.反向选择
//
// keyStart int 返回的起始 key(不包含), 空字符串表示 -inf.
// keyEnd int 返回的结束 key(包含), 空字符串表示 +inf.
// limit int 最多返回这么多个元素.
// 返回 返回包含 key 的数组.
// 返回 err,可能的错误,操作成功返回 nil
func (c *SDBClient) Rkeys(keyStart, keyEnd string, limit int64) ([]string, error) {
resp, err := c.Do("rkeys", keyStart, keyEnd, limit)
if err != nil {
return nil, newErrorf(err, "Rkeys [%s,%s] %d error", keyStart, keyEnd, limit)
}
if len(resp) > 0 && resp[0] == OK {
return resp[1:], nil
}
return nil, makeError(resp, keyStart, keyEnd, limit)
}
// Do do
func (c *SDBClient) Do(args ...interface{}) ([]string, error) {
c.mu.Lock()
defer c.mu.Unlock()
//dlog.Warn("begin to send", "value", fmt.Sprintf("%v", args))
err := c.send(args)
if err != nil {
//dlog.Error("send error", "value", fmt.Sprintf("%v", err))
return nil, err
}
resp, err := c.recv()
//dlog.Warn("begin to return", "value", fmt.Sprintf("%v", resp))
return resp, err
}
func (c *SDBClient) send(args []interface{}) error {
var packetBuf bytes.Buffer
var err error
for _, arg := range args {
switch arg := arg.(type) {
case string:
if _, err = packetBuf.Write(strconv.AppendInt(nil, int64(len(arg)), 10)); err != nil {
return err
}
if err = packetBuf.WriteByte(ENDN); err != nil {
return err
}
if _, err = packetBuf.WriteString(arg); err != nil {
return err
}
case []string:
for _, a := range arg {
if _, err = packetBuf.Write(strconv.AppendInt(nil, int64(len(a)), 10)); err != nil {
return err
}
if err = packetBuf.WriteByte(ENDN); err != nil {
return err
}
if _, err = packetBuf.WriteString(a); err != nil {
return err
}
if err = packetBuf.WriteByte(ENDN); err != nil {
return err
}
}
continue
case []byte:
if _, err = packetBuf.Write(strconv.AppendInt(nil, int64(len(arg)), 10)); err != nil {
return err
}
if err = packetBuf.WriteByte(ENDN); err != nil {
return err
}
if _, err = packetBuf.Write(arg); err != nil {
return err
}
case int64:
bs := strconv.AppendInt(nil, arg, 10)
if _, err = packetBuf.Write(strconv.AppendInt(nil, int64(len(bs)), 10)); err != nil {
return err
}
if err = packetBuf.WriteByte(ENDN); err != nil {
return err
}
if _, err = packetBuf.Write(bs); err != nil {
return err
}
case nil:
if err = packetBuf.WriteByte(0); err != nil {
return err
}
if err = packetBuf.WriteByte(ENDN); err != nil {
return err
}
if _, err = packetBuf.WriteString(""); err != nil {
return err
}
default:
return fmt.Errorf("bad arguments type")
}
if err = packetBuf.WriteByte(ENDN); err != nil {
return err
}
}
if err = packetBuf.WriteByte(ENDN); err != nil {
return err
}
if err = c.sock.SetWriteDeadline(time.Now().Add(time.Second * WriteTimeOut)); err != nil {
return err
}
for _, err = packetBuf.WriteTo(c.sock); packetBuf.Len() > 0; {
if err != nil {
packetBuf.Reset()
return newErrorf(err, "client socket write error")
}
}
//设置不超时
if err := c.sock.SetWriteDeadline(c.timeZero); err != nil {
return err
}
packetBuf.Reset()
return nil
}
func (c *SDBClient) recv() (resp []string, err error) {
packetBuf := []byte{}
//设置读取数据超时,
if err = c.sock.SetReadDeadline(time.Now().Add(time.Second * ReadTimeOut)); 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
readBuf := make([]byte, ReadBufSize)
for {
bufSize, err := c.sock.Read(readBuf)
if err != nil {
return nil, newErrorf(err, "client socket read error")
}
if bufSize < 1 {
continue
}
packetBuf = append(packetBuf, readBuf[:bufSize]...)
for {
rsp, n := c.parse(packetBuf)
if n == -1 {
break
} else if n == -2 {
return nil, newErrorf(err, "parse error")
} else {
resp = append(resp, rsp)
packetBuf = packetBuf[n+1:]
}
}
}
}
func (c *SDBClient) parse(buf []byte) (resp string, size int) {
n := bytes.IndexByte(buf, ENDN)
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
}
// Close The Client Connection
func (c *SDBClient) Close() error {
return c.sock.Close()
}
// 生成通过的错误信息,已经确定是有错误
func makeError(resp []string, errKey ...interface{}) error {
if len(resp) < 1 {
return newError("ssdb response error")
}
//正常返回的不存在不报错,如果要捕捉这个问题请使用exists
if resp[0] == NotFound {
return ErrNotFoundInDb
}
if len(errKey) > 0 {
return newError("access ssdb error, code is %v, parameter is %v", resp, errKey)
}
return newError("access ssdb error, code is %v", resp)
}
// Value 扩展值,原始类型为 string
type Value struct {
val []byte
}
// 返回 string 的值
func (v *Value) String() string {
return string(v.val)
}
// Bytes 返回 []byte 类型的值
func (v *Value) Bytes() []byte {
return v.val
}
func toValue(val interface{}) *Value {
if val == nil {
return nil
}
if v, ok := val.(string); ok {
return &Value{val: []byte(v)}
} else if v, ok := val.([]byte); ok {
return &Value{val: v}
} else {
dlog.Error("unsupported value type", "value", val)
return nil
}
}
var (
byt = []int{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9}
maxByteSize byte = 57
minByteSize byte = 48
)
// ToNum []byte -> int
func ToNum(bs []byte) int {
re := 0
for _, v := range bs {
if v > maxByteSize || v < minByteSize {
return re
}
re = re*10 + byt[v]
}
return re
}
var (
//FormatString 格式化字符串
FormatString = "%v\nthe trace error is\n%s"
)
// 返回一个错误
func newError(format string, p ...interface{}) error {
return fmt.Errorf(format, p...)
}
// 按格式返回一个错误
// 同时携带原始的错误信息
func newErrorf(err error, format string, p ...interface{}) error {
return fmt.Errorf(FormatString, fmt.Sprintf(format, p...), err)
}