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|
package schema
import (
"database/sql/driver"
"fmt"
"net"
"reflect"
"strconv"
"time"
"github.com/uptrace/bun/dialect"
"github.com/uptrace/bun/extra/bunjson"
"github.com/uptrace/bun/internal"
)
type (
AppenderFunc func(fmter Formatter, b []byte, v reflect.Value) []byte
CustomAppender func(typ reflect.Type) AppenderFunc
)
var appenders = []AppenderFunc{
reflect.Bool: AppendBoolValue,
reflect.Int: AppendIntValue,
reflect.Int8: AppendIntValue,
reflect.Int16: AppendIntValue,
reflect.Int32: AppendIntValue,
reflect.Int64: AppendIntValue,
reflect.Uint: AppendUintValue,
reflect.Uint8: AppendUintValue,
reflect.Uint16: AppendUintValue,
reflect.Uint32: AppendUintValue,
reflect.Uint64: AppendUintValue,
reflect.Uintptr: nil,
reflect.Float32: AppendFloat32Value,
reflect.Float64: AppendFloat64Value,
reflect.Complex64: nil,
reflect.Complex128: nil,
reflect.Array: AppendJSONValue,
reflect.Chan: nil,
reflect.Func: nil,
reflect.Interface: nil,
reflect.Map: AppendJSONValue,
reflect.Ptr: nil,
reflect.Slice: AppendJSONValue,
reflect.String: AppendStringValue,
reflect.Struct: AppendJSONValue,
reflect.UnsafePointer: nil,
}
func Appender(typ reflect.Type, custom CustomAppender) AppenderFunc {
switch typ {
case bytesType:
return appendBytesValue
case timeType:
return appendTimeValue
case ipType:
return appendIPValue
case ipNetType:
return appendIPNetValue
case jsonRawMessageType:
return appendJSONRawMessageValue
}
if typ.Implements(queryAppenderType) {
return appendQueryAppenderValue
}
if typ.Implements(driverValuerType) {
return driverValueAppender(custom)
}
kind := typ.Kind()
if kind != reflect.Ptr {
ptr := reflect.PtrTo(typ)
if ptr.Implements(queryAppenderType) {
return addrAppender(appendQueryAppenderValue, custom)
}
if ptr.Implements(driverValuerType) {
return addrAppender(driverValueAppender(custom), custom)
}
}
switch kind {
case reflect.Interface:
return ifaceAppenderFunc(typ, custom)
case reflect.Ptr:
if fn := Appender(typ.Elem(), custom); fn != nil {
return PtrAppender(fn)
}
case reflect.Slice:
if typ.Elem().Kind() == reflect.Uint8 {
return appendBytesValue
}
case reflect.Array:
if typ.Elem().Kind() == reflect.Uint8 {
return appendArrayBytesValue
}
}
if custom != nil {
if fn := custom(typ); fn != nil {
return fn
}
}
return appenders[typ.Kind()]
}
func ifaceAppenderFunc(typ reflect.Type, custom func(reflect.Type) AppenderFunc) AppenderFunc {
return func(fmter Formatter, b []byte, v reflect.Value) []byte {
if v.IsNil() {
return dialect.AppendNull(b)
}
elem := v.Elem()
appender := Appender(elem.Type(), custom)
return appender(fmter, b, elem)
}
}
func PtrAppender(fn AppenderFunc) AppenderFunc {
return func(fmter Formatter, b []byte, v reflect.Value) []byte {
if v.IsNil() {
return dialect.AppendNull(b)
}
return fn(fmter, b, v.Elem())
}
}
func AppendBoolValue(fmter Formatter, b []byte, v reflect.Value) []byte {
return dialect.AppendBool(b, v.Bool())
}
func AppendIntValue(fmter Formatter, b []byte, v reflect.Value) []byte {
return strconv.AppendInt(b, v.Int(), 10)
}
func AppendUintValue(fmter Formatter, b []byte, v reflect.Value) []byte {
return strconv.AppendUint(b, v.Uint(), 10)
}
func AppendFloat32Value(fmter Formatter, b []byte, v reflect.Value) []byte {
return dialect.AppendFloat32(b, float32(v.Float()))
}
func AppendFloat64Value(fmter Formatter, b []byte, v reflect.Value) []byte {
return dialect.AppendFloat64(b, float64(v.Float()))
}
func appendBytesValue(fmter Formatter, b []byte, v reflect.Value) []byte {
return dialect.AppendBytes(b, v.Bytes())
}
func appendArrayBytesValue(fmter Formatter, b []byte, v reflect.Value) []byte {
if v.CanAddr() {
return dialect.AppendBytes(b, v.Slice(0, v.Len()).Bytes())
}
tmp := make([]byte, v.Len())
reflect.Copy(reflect.ValueOf(tmp), v)
b = dialect.AppendBytes(b, tmp)
return b
}
func AppendStringValue(fmter Formatter, b []byte, v reflect.Value) []byte {
return dialect.AppendString(b, v.String())
}
func AppendJSONValue(fmter Formatter, b []byte, v reflect.Value) []byte {
bb, err := bunjson.Marshal(v.Interface())
if err != nil {
return dialect.AppendError(b, err)
}
if len(bb) > 0 && bb[len(bb)-1] == '\n' {
bb = bb[:len(bb)-1]
}
return dialect.AppendJSON(b, bb)
}
func appendTimeValue(fmter Formatter, b []byte, v reflect.Value) []byte {
tm := v.Interface().(time.Time)
return dialect.AppendTime(b, tm)
}
func appendIPValue(fmter Formatter, b []byte, v reflect.Value) []byte {
ip := v.Interface().(net.IP)
return dialect.AppendString(b, ip.String())
}
func appendIPNetValue(fmter Formatter, b []byte, v reflect.Value) []byte {
ipnet := v.Interface().(net.IPNet)
return dialect.AppendString(b, ipnet.String())
}
func appendJSONRawMessageValue(fmter Formatter, b []byte, v reflect.Value) []byte {
bytes := v.Bytes()
if bytes == nil {
return dialect.AppendNull(b)
}
return dialect.AppendString(b, internal.String(bytes))
}
func appendQueryAppenderValue(fmter Formatter, b []byte, v reflect.Value) []byte {
return AppendQueryAppender(fmter, b, v.Interface().(QueryAppender))
}
func driverValueAppender(custom CustomAppender) AppenderFunc {
return func(fmter Formatter, b []byte, v reflect.Value) []byte {
return appendDriverValue(fmter, b, v.Interface().(driver.Valuer), custom)
}
}
func appendDriverValue(fmter Formatter, b []byte, v driver.Valuer, custom CustomAppender) []byte {
value, err := v.Value()
if err != nil {
return dialect.AppendError(b, err)
}
return Append(fmter, b, value, custom)
}
func addrAppender(fn AppenderFunc, custom CustomAppender) AppenderFunc {
return func(fmter Formatter, b []byte, v reflect.Value) []byte {
if !v.CanAddr() {
err := fmt.Errorf("bun: Append(nonaddressable %T)", v.Interface())
return dialect.AppendError(b, err)
}
return fn(fmter, b, v.Addr())
}
}
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