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cmder.go
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/
cmder.go
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package redis
import (
"encoding/hex"
"fmt"
"github.com/donetkit/contrib/utils/gstring"
"github.com/go-redis/redis/v8"
"strconv"
"time"
)
func CmdString(cmd redis.Cmder) string {
b := make([]byte, 0, 32)
b = AppendCmd(b, cmd)
return gstring.String(b)
}
func CmdsString(cmds []redis.Cmder) (string, string) {
const numCmdLimit = 100
const numNameLimit = 10
seen := make(map[string]struct{}, numNameLimit)
unqNames := make([]string, 0, numNameLimit)
b := make([]byte, 0, 32*len(cmds))
for i, cmd := range cmds {
if i > numCmdLimit {
break
}
if i > 0 {
b = append(b, '\n')
}
b = AppendCmd(b, cmd)
if len(unqNames) >= numNameLimit {
continue
}
name := cmd.FullName()
if _, ok := seen[name]; !ok {
seen[name] = struct{}{}
unqNames = append(unqNames, name)
}
}
summary := gstring.Join(unqNames, " ")
return summary, gstring.String(b)
}
func AppendCmd(b []byte, cmd redis.Cmder) []byte {
const numArgLimit = 32
for i, arg := range cmd.Args() {
if i > numArgLimit {
break
}
if i > 0 {
b = append(b, ' ')
}
b = appendArg(b, arg)
}
if err := cmd.Err(); err != nil {
b = append(b, ": "...)
b = append(b, err.Error()...)
}
return b
}
func appendArg(b []byte, v interface{}) []byte {
const argLenLimit = 64
switch v := v.(type) {
case nil:
return append(b, "<nil>"...)
case string:
if len(v) > argLenLimit {
v = v[:argLenLimit]
}
return appendUTF8String(b, gstring.Bytes(v))
case []byte:
if len(v) > argLenLimit {
v = v[:argLenLimit]
}
return appendUTF8String(b, v)
case int:
return strconv.AppendInt(b, int64(v), 10)
case int8:
return strconv.AppendInt(b, int64(v), 10)
case int16:
return strconv.AppendInt(b, int64(v), 10)
case int32:
return strconv.AppendInt(b, int64(v), 10)
case int64:
return strconv.AppendInt(b, v, 10)
case uint:
return strconv.AppendUint(b, uint64(v), 10)
case uint8:
return strconv.AppendUint(b, uint64(v), 10)
case uint16:
return strconv.AppendUint(b, uint64(v), 10)
case uint32:
return strconv.AppendUint(b, uint64(v), 10)
case uint64:
return strconv.AppendUint(b, v, 10)
case float32:
return strconv.AppendFloat(b, float64(v), 'f', -1, 64)
case float64:
return strconv.AppendFloat(b, v, 'f', -1, 64)
case bool:
if v {
return append(b, "true"...)
}
return append(b, "false"...)
case time.Time:
return v.AppendFormat(b, time.RFC3339Nano)
default:
return append(b, fmt.Sprint(v)...)
}
}
func appendUTF8String(dst []byte, src []byte) []byte {
if isSimple(src) {
dst = append(dst, src...)
return dst
}
s := len(dst)
dst = append(dst, make([]byte, hex.EncodedLen(len(src)))...)
hex.Encode(dst[s:], src)
return dst
}
func isSimple(b []byte) bool {
for _, c := range b {
if !isSimpleByte(c) {
return false
}
}
return true
}
func isSimpleByte(c byte) bool {
return c >= 0x21 && c <= 0x7e
}
func tracerCmdsString(cms []redis.Cmder) []string {
const numCmdLimit = 100
const numNameLimit = 10
seen := make(map[string]struct{}, numNameLimit)
unqNames := make([]string, 0, numNameLimit)
b := make([]byte, 0, 32*len(cms))
for i, cmd := range cms {
if i > numCmdLimit {
break
}
if i > 0 {
b = append(b, '\n')
}
b = AppendCmd(b, cmd)
if len(unqNames) >= numNameLimit {
continue
}
name := cmd.FullName()
if _, ok := seen[name]; !ok {
seen[name] = struct{}{}
unqNames = append(unqNames, name)
}
}
summary := gstring.Join(unqNames, " ")
result := []string{summary, gstring.String(b)}
return result
}
func tracerCmdString(cmd redis.Cmder) string {
b := make([]byte, 0, 32)
b = AppendCmd(b, cmd)
return gstring.String(b)
}