diff --git a/crypt/crypt.go b/crypt/crypt.go
new file mode 100644
index 0000000..364d798
--- /dev/null
+++ b/crypt/crypt.go
@@ -0,0 +1,60 @@
+package crypt
+
+import (
+	"crypto/cipher"
+	"crypto/rand"
+	"log"
+
+	"golang.org/x/crypto/chacha20poly1305"
+)
+
+type Crypt struct {
+	key  []byte
+	ads  []byte
+	aead cipher.AEAD
+}
+
+func NewChacha20poly1305Key() []byte {
+	k := make([]byte, chacha20poly1305.KeySize)
+	if _, err := rand.Read(k); err != nil {
+		panic(err)
+	}
+	return k
+}
+
+func NewCrypt(key []byte, ads []byte) *Crypt {
+	if len(key) == 0 {
+		// log.Printf(" == GENERATE NEW KEY ==\n")
+		key = NewChacha20poly1305Key()
+	}
+	aead, err := chacha20poly1305.New(key)
+	if err != nil {
+		panic(err)
+	}
+	return &Crypt{key: key, ads: ads, aead: aead}
+}
+
+func (c *Crypt) GenNonce(length int) []byte {
+	nonce := make([]byte, c.aead.NonceSize(), c.aead.NonceSize()+length+c.aead.Overhead())
+	if _, err := rand.Read(nonce); err != nil {
+		panic(err)
+	}
+	return nonce
+}
+
+func (c *Crypt) Encrypt(msg []byte) []byte {
+	nonce := c.GenNonce(len(msg))
+	encryptedMsg := c.aead.Seal(nonce, nonce, msg, c.ads)
+	return encryptedMsg
+}
+
+func (c *Crypt) Decrypt(encrypted []byte) ([]byte, bool) {
+	done := true
+	nonce, ciphertext := encrypted[:c.aead.NonceSize()], encrypted[c.aead.NonceSize():]
+	plaintext, err := c.aead.Open(nil, nonce, ciphertext, c.ads)
+	if err != nil {
+		done = false
+		log.Printf(" error decrypt data : %v\n", err)
+	}
+	return plaintext, done
+}
diff --git a/db/db.go b/db/db.go
new file mode 100644
index 0000000..00a95ca
--- /dev/null
+++ b/db/db.go
@@ -0,0 +1,171 @@
+package db
+
+import (
+	"database/sql"
+	"fmt"
+	"log"
+	"time"
+
+	"gitea.meta-tech.academy/go/core/util"
+
+	"github.com/go-sql-driver/mysql"
+)
+
+const USER_DEFAULT_PRIVILEGES = "CREATE, CREATE VIEW, CREATE TEMPORARY TABLES, SELECT, INSERT, UPDATE, DELETE, EXECUTE, LOCK TABLES, TRIGGER"
+
+var MAX_OPEN_CONNS = 500
+var MAX_IDLE_CONNS = 0
+
+type Db struct {
+	pool map[string]*sql.DB
+}
+
+type DbConfig struct {
+	host   string
+	dbname string
+	user   string
+	passwd string
+	port   int
+}
+
+type PasswordDecode func(in string) (string, bool)
+
+func (dbc *DbConfig) GetHost() string {
+	return fmt.Sprintf("%s:%d", dbc.host, dbc.port)
+}
+
+func (dbc *DbConfig) GetSqlConfig(passwdGet ...PasswordDecode) *mysql.Config {
+	var plain string = dbc.passwd
+	var done bool = len(passwdGet) == 0
+	if !done {
+		plain, done = passwdGet[0](dbc.passwd)
+	}
+	if done {
+		return &mysql.Config{
+			User:                 dbc.user,
+			Net:                  "tcp",
+			Addr:                 dbc.GetHost(),
+			DBName:               dbc.dbname,
+			Passwd:               plain,
+			AllowNativePasswords: true,
+		}
+	} else {
+		fmt.Printf("invalid password unable to connect")
+		time.Sleep(3 * time.Second)
+	}
+	return nil
+}
+
+func (dbc *DbConfig) NewDbConfig(host string, dbname string, user string, passwd string, port int) *DbConfig {
+	return &DbConfig{host, dbname, user, passwd, port}
+}
+
+func (db *Db) AddDb(dbconf *DbConfig, passwdGet ...PasswordDecode) {
+	cnx, err := sql.Open("mysql", dbconf.GetSqlConfig(passwdGet...).FormatDSN())
+	if err != nil {
+		log.Fatal(err)
+	}
+	pingErr := cnx.Ping()
+	if pingErr != nil {
+		log.Fatal(pingErr)
+	}
+	cnx.SetMaxIdleConns(MAX_IDLE_CONNS)
+	cnx.SetMaxOpenConns(MAX_OPEN_CONNS)
+	db.pool[dbconf.dbname] = cnx
+}
+
+func NewDb() *Db {
+	pool := make(map[string]*sql.DB)
+	return &Db{pool}
+}
+
+func getFullUser(username string, hostname string) string {
+	return fmt.Sprintf("'%s'@'%s'", util.EscapeSquote(username), util.EscapeSquote(hostname))
+}
+
+func (db *Db) onDbExec(dbname string, instr DbInstruct) bool {
+	var done bool
+	if sqlDb, ok := db.pool[dbname]; ok {
+		return instr(sqlDb)
+	} else {
+		fmt.Printf("you should add db mysql first\n")
+		done = ok
+	}
+	return done
+}
+
+type DbInstruct func(database *sql.DB) bool
+
+func (db *Db) CreateUser(username string, hostname string, passwd string) bool {
+	return db.onDbExec("mysql", func(sqlDb *sql.DB) bool {
+		query := fmt.Sprintf(
+			"CREATE USER IF NOT EXISTS %s IDENTIFIED BY '%s';",
+			getFullUser(username, hostname),
+			util.EscapeSquote(passwd),
+		)
+		_, err := sqlDb.Exec(query)
+		done := err == nil
+		if !done {
+			fmt.Printf("unable to add user %s\n%v\n", username, err)
+		}
+		return done
+	})
+}
+
+func (db *Db) GrantUserPrivileges(dbname string, username string, hostname string) bool {
+	return db.onDbExec("mysql", func(sqlDb *sql.DB) bool {
+		query := fmt.Sprintf(
+			"GRANT %s ON `%s`.* TO  %s;",
+			USER_DEFAULT_PRIVILEGES,
+			util.EscapeBt(dbname),
+			getFullUser(username, hostname),
+		)
+		_, err := sqlDb.Exec(query)
+		done := err == nil
+		if !done {
+			fmt.Printf("query : %s\n", query)
+			fmt.Printf("unable to grant user privilege %s\n%v\n", username, err)
+		}
+		return done
+	})
+}
+
+func (db *Db) CreateDb(dbname string, collate string) bool {
+	return db.onDbExec("mysql", func(sqlDb *sql.DB) bool {
+		query := fmt.Sprintf(
+			"CREATE DATABASE IF NOT EXISTS `%s` CHARACTER SET '%s' COLLATE '%s_unicode_ci'",
+			util.EscapeBt(dbname),
+			util.EscapeSquote(collate),
+			util.EscapeSquote(collate),
+		)
+		_, err := db.pool["mysql"].Exec(query)
+		done := err == nil
+		if !done {
+			fmt.Printf("unable to create database %s\n%v\n", dbname, err)
+		}
+		return done
+	})
+}
+
+func (db *Db) SizeDb(dbname string) float32 {
+	type RsSize struct {
+		Dbname string
+		Size   float32
+	}
+	rs := RsSize{Size: -1}
+	db.onDbExec("information_schema", func(sqlDb *sql.DB) bool {
+		query := "SELECT table_schema 'dbname', SUM(data_length + index_length)/1024/1024 'size' FROM TABLES WHERE table_schema = ? GROUP BY table_schema;"
+		row := sqlDb.QueryRow(query, dbname)
+		err := row.Scan(&rs.Dbname, &rs.Size)
+		done := err != nil
+		if !done {
+			if err == sql.ErrNoRows {
+				fmt.Printf("   cannot find db %s or db is empty\n", dbname)
+			} else {
+				fmt.Printf("   what the fuck error : %+v\n", err)
+			}
+		}
+		return done
+	})
+	return rs.Size
+}
diff --git a/echo/echo.go b/echo/echo.go
index c25ac05..5c9865b 100644
--- a/echo/echo.go
+++ b/echo/echo.go
@@ -10,10 +10,11 @@ import (
 
 var curStyles *style.Styles
 var hasCurStyle bool = false
+var msgUninit = "Missing current *style.Styles, you should call echo.SetCurrentStyles(styles *style.Styles) first"
 
 func Cstyle(name string) *style.Style {
 	if !hasCurStyle {
-		panic("Missing current style, you should call style.SetCurrentStyles(styles *style.Styles) first\n")
+		panic(msgUninit)
 	}
 	return curStyles.Get(name)
 }
@@ -63,6 +64,13 @@ func State(done bool) {
 	Ln()
 }
 
+func Keyval(key string, val string, names ...string) {
+	if !hasCurStyle {
+		panic(msgUninit)
+	}
+	curStyles.Keyval(key, val, names...)
+}
+
 func Msg(msg string) {
 	fmt.Printf("%s%s\n", strings.Repeat(" ", 4), msg)
 }
diff --git a/go.mod b/go.mod
index 8e486a4..09eef5b 100644
--- a/go.mod
+++ b/go.mod
@@ -3,8 +3,12 @@ module gitea.meta-tech.academy/go/core
 go 1.20
 
 require (
+	github.com/go-sql-driver/mysql v1.7.1
 	github.com/gookit/color v1.5.4
-	golang.org/x/sys v0.13.0
+	github.com/ulikunitz/xz v0.5.11
+	golang.org/x/crypto v0.14.0
+	golang.org/x/sys v0.14.0
+	golang.org/x/text v0.14.0
 	gopkg.in/yaml.v3 v3.0.1
 )
 
diff --git a/go.sum b/go.sum
index f71ea80..5bd6d47 100644
--- a/go.sum
+++ b/go.sum
@@ -1,12 +1,20 @@
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/go-sql-driver/mysql v1.7.1 h1:lUIinVbN1DY0xBg0eMOzmmtGoHwWBbvnWubQUrtU8EI=
+github.com/go-sql-driver/mysql v1.7.1/go.mod h1:OXbVy3sEdcQ2Doequ6Z5BW6fXNQTmx+9S1MCJN5yJMI=
 github.com/gookit/color v1.5.4 h1:FZmqs7XOyGgCAxmWyPslpiok1k05wmY3SJTytgvYFs0=
 github.com/gookit/color v1.5.4/go.mod h1:pZJOeOS8DM43rXbp4AZo1n9zCU2qjpcRko0b6/QJi9w=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/stretchr/testify v1.8.4 h1:CcVxjf3Q8PM0mHUKJCdn+eZZtm5yQwehR5yeSVQQcUk=
+github.com/ulikunitz/xz v0.5.11 h1:kpFauv27b6ynzBNT/Xy+1k+fK4WswhN/6PN5WhFAGw8=
+github.com/ulikunitz/xz v0.5.11/go.mod h1:nbz6k7qbPmH4IRqmfOplQw/tblSgqTqBwxkY0oWt/14=
 github.com/xo/terminfo v0.0.0-20210125001918-ca9a967f8778 h1:QldyIu/L63oPpyvQmHgvgickp1Yw510KJOqX7H24mg8=
 github.com/xo/terminfo v0.0.0-20210125001918-ca9a967f8778/go.mod h1:2MuV+tbUrU1zIOPMxZ5EncGwgmMJsa+9ucAQZXxsObs=
-golang.org/x/sys v0.13.0 h1:Af8nKPmuFypiUBjVoU9V20FiaFXOcuZI21p0ycVYYGE=
-golang.org/x/sys v0.13.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/crypto v0.14.0 h1:wBqGXzWJW6m1XrIKlAH0Hs1JJ7+9KBwnIO8v66Q9cHc=
+golang.org/x/crypto v0.14.0/go.mod h1:MVFd36DqK4CsrnJYDkBA3VC4m2GkXAM0PvzMCn4JQf4=
+golang.org/x/sys v0.14.0 h1:Vz7Qs629MkJkGyHxUlRHizWJRG2j8fbQKjELVSNhy7Q=
+golang.org/x/sys v0.14.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/text v0.14.0 h1:ScX5w1eTa3QqT8oi6+ziP7dTV1S2+ALU0bI+0zXKWiQ=
+golang.org/x/text v0.14.0/go.mod h1:18ZOQIKpY8NJVqYksKHtTdi31H5itFRjB5/qKTNYzSU=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
diff --git a/sys/xtract.go b/sys/xtract.go
new file mode 100644
index 0000000..54ccd78
--- /dev/null
+++ b/sys/xtract.go
@@ -0,0 +1,132 @@
+package sys
+
+import (
+	"archive/zip"
+	"bufio"
+	"bytes"
+	"compress/bzip2"
+	"compress/gzip"
+	"fmt"
+	"io"
+	"log"
+	"os"
+
+	"github.com/ulikunitz/xz"
+)
+
+type Xtract struct {
+	dir     string
+	reader  *bufio.Reader
+	bar     *io.Writer
+	outFile string
+	withBar bool
+}
+
+func NewXtract(dir string, outFile string) *Xtract {
+	return &Xtract{dir: dir, outFile: outFile, withBar: false}
+}
+
+func (x *Xtract) addBar(bar *io.Writer) {
+	x.bar = bar
+	x.withBar = true
+}
+
+func (x *Xtract) setCompressedFile(dumpName string) {
+	path := fmt.Sprintf("%s/%s", x.dir, dumpName)
+	file, err := os.Open(path)
+	if err != nil {
+		panic(err)
+	}
+	x.reader = bufio.NewReader(file)
+}
+
+func (x *Xtract) writeUncompressedData(out *bytes.Buffer) bool {
+	err := os.WriteFile(x.outFile, out.Bytes(), 0644)
+	if err != nil {
+		panic(err)
+	}
+	return true
+}
+
+func (x *Xtract) UnGzip(dumpName string) bool {
+	x.setCompressedFile(dumpName)
+	var out bytes.Buffer
+	r, err := gzip.NewReader(x.reader)
+	if err != nil {
+		panic(err)
+	}
+	if x.withBar {
+		_, err = io.Copy(io.MultiWriter(&out, *x.bar), r)
+	} else {
+		_, err = io.Copy(&out, r)
+	}
+	if err != nil {
+		panic(err)
+	}
+	// if x.withBar {
+	// 	x.bar.Clear()
+	// }
+	return x.writeUncompressedData(&out)
+}
+
+func (x *Xtract) UnBz2(dumpName string) bool {
+	x.setCompressedFile(dumpName)
+	var out bytes.Buffer
+	r := bzip2.NewReader(x.reader)
+	var err error
+	if x.withBar {
+		_, err = io.Copy(io.MultiWriter(&out, *x.bar), r)
+	} else {
+		_, err = io.Copy(&out, r)
+	}
+	if err != nil {
+		panic(err)
+	}
+	return x.writeUncompressedData(&out)
+}
+
+func (x *Xtract) UnXz(dumpName string) bool {
+	x.setCompressedFile(dumpName)
+	var out bytes.Buffer
+	r, err := xz.NewReader(x.reader)
+	if err != nil {
+		panic(err)
+	}
+	if x.withBar {
+		_, err = io.Copy(io.MultiWriter(&out, *x.bar), r)
+	} else {
+		_, err = io.Copy(&out, r)
+	}
+	if err != nil {
+		panic(err)
+	}
+	return x.writeUncompressedData(&out)
+}
+
+func (x *Xtract) UnZip(dumpName string) bool {
+	var done bool = false
+	path := fmt.Sprintf("%s/%s", x.dir, dumpName)
+	r, err := zip.OpenReader(path)
+	if err != nil {
+		panic(err)
+	}
+	defer r.Close()
+	if len(r.File) > 0 {
+		rc, err := r.File[0].Open()
+		if err != nil {
+			log.Fatal(err)
+		}
+		var out bytes.Buffer
+		if x.withBar {
+			_, err = io.Copy(io.MultiWriter(&out, *x.bar), rc)
+		} else {
+			_, err = io.Copy(&out, rc)
+		}
+		if err != nil {
+			log.Fatal(err)
+		}
+		rc.Close()
+		done = x.writeUncompressedData(&out)
+	}
+	return done
+}
diff --git a/util/util.go b/util/util.go
index 0352940..15db22d 100644
--- a/util/util.go
+++ b/util/util.go
@@ -1,8 +1,17 @@
 package util
 
 import (
+	"bytes"
+	"encoding/hex"
+	"fmt"
+	"log"
+	"math"
+	"path"
 	"strconv"
 	"strings"
+
+	"golang.org/x/text/cases"
+	"golang.org/x/text/language"
 )
 
 func PrependToSliceStr(strs *[]string, prefix string) {
@@ -38,3 +47,62 @@ func CastStrings2ints(strs *[]string) []int {
 	}
 	return a
 }
+
+func PrettyByteSize(b int64) string {
+	bf := float64(b)
+	for _, unit := range []string{"", "Ki", "Mi", "Gi", "Ti", "Pi", "Ei", "Zi"} {
+		if math.Abs(bf) < 1024.0 {
+			return fmt.Sprintf("%3.2f%s", bf, unit)
+		}
+		bf /= 1024.0
+	}
+	return fmt.Sprintf("%.2fYi", bf)
+}
+
+func Ucfirst(str *string) {
+	caser := cases.Title(language.English)
+	*str = caser.String(*str)
+}
+
+func RemoveExtension(fileName string) string {
+	return strings.TrimSuffix(fileName, path.Ext(fileName))
+}
+
+func GetBytesAsHex(key []byte) []byte {
+	dst := make([]byte, hex.EncodedLen(len(key)))
+	hex.Encode(dst, key)
+	return dst
+}
+
+func GetBytesFromHex(key []byte) []byte {
+	dst := make([]byte, hex.DecodedLen(len(key)))
+	n, err := hex.Decode(dst, key)
+	if err != nil {
+		log.Fatal(err)
+	}
+	return dst[:n]
+}
+
+func Escape(str string, c rune) string {
+	var buf bytes.Buffer
+	for _, char := range str {
+		switch char {
+		case c:
+			buf.WriteRune('\\')
+		}
+		buf.WriteRune(char)
+	}
+	return buf.String()
+}
+
+func EscapeBt(str string) string {
+	return Escape(str, '`')
+}
+
+func EscapeDquote(str string) string {
+	return Escape(str, '"')
+}
+
+func EscapeSquote(str string) string {
+	return Escape(str, '\'')
+}