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tag_auto_wire_bean_factory.go
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tag_auto_wire_bean_factory.go
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// Copyright 2020
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package bean
import (
"context"
"fmt"
"reflect"
"strconv"
"github.com/pkg/errors"
"github.com/beego/beego/v2/core/logs"
)
const DefaultValueTagKey = "default"
// TagAutoWireBeanFactory wire the bean based on Fields' tag
// if field's value is "zero value", we will execute injection
// see reflect.Value.IsZero()
// If field's kind is one of(reflect.Chan, reflect.Func, reflect.Interface, reflect.Map, reflect.Slice
// reflect.UnsafePointer, reflect.Array, reflect.Uintptr, reflect.Complex64, reflect.Complex128
// reflect.Ptr, reflect.Struct),
// it will be ignored
type TagAutoWireBeanFactory struct {
// we allow user register their TypeAdapter
Adapters map[string]TypeAdapter
// FieldTagParser is an extension point which means that you can custom how to read field's metadata from tag
FieldTagParser func(field reflect.StructField) *FieldMetadata
}
// NewTagAutoWireBeanFactory create an instance of TagAutoWireBeanFactory
// by default, we register Time adapter, the time will be parse by using layout "2006-01-02 15:04:05"
// If you need more adapter, you can implement interface TypeAdapter
func NewTagAutoWireBeanFactory() *TagAutoWireBeanFactory {
return &TagAutoWireBeanFactory{
Adapters: map[string]TypeAdapter{
"Time": &TimeTypeAdapter{Layout: "2006-01-02 15:04:05"},
},
FieldTagParser: func(field reflect.StructField) *FieldMetadata {
return &FieldMetadata{
DftValue: field.Tag.Get(DefaultValueTagKey),
}
},
}
}
// AutoWire use value from appCtx to wire the bean, or use default value, or do nothing
func (t *TagAutoWireBeanFactory) AutoWire(ctx context.Context, appCtx ApplicationContext, bean interface{}) error {
if bean == nil {
return nil
}
v := reflect.Indirect(reflect.ValueOf(bean))
bm := t.getConfig(v)
// field name, field metadata
for fn, fm := range bm.Fields {
fValue := v.FieldByName(fn)
if len(fm.DftValue) == 0 || !t.needInject(fValue) || !fValue.CanSet() {
continue
}
// handle type adapter
typeName := fValue.Type().Name()
if adapter, ok := t.Adapters[typeName]; ok {
dftValue, err := adapter.DefaultValue(ctx, fm.DftValue)
if err == nil {
fValue.Set(reflect.ValueOf(dftValue))
continue
} else {
return err
}
}
switch fValue.Kind() {
case reflect.Bool:
if v, err := strconv.ParseBool(fm.DftValue); err != nil {
return errors.WithMessage(err,
fmt.Sprintf("can not convert the field[%s]'s default value[%s] to bool value",
fn, fm.DftValue))
} else {
fValue.SetBool(v)
continue
}
case reflect.Int:
if err := t.setIntXValue(fm.DftValue, 0, fn, fValue); err != nil {
return err
}
continue
case reflect.Int8:
if err := t.setIntXValue(fm.DftValue, 8, fn, fValue); err != nil {
return err
}
continue
case reflect.Int16:
if err := t.setIntXValue(fm.DftValue, 16, fn, fValue); err != nil {
return err
}
continue
case reflect.Int32:
if err := t.setIntXValue(fm.DftValue, 32, fn, fValue); err != nil {
return err
}
continue
case reflect.Int64:
if err := t.setIntXValue(fm.DftValue, 64, fn, fValue); err != nil {
return err
}
continue
case reflect.Uint:
if err := t.setUIntXValue(fm.DftValue, 0, fn, fValue); err != nil {
return err
}
case reflect.Uint8:
if err := t.setUIntXValue(fm.DftValue, 8, fn, fValue); err != nil {
return err
}
continue
case reflect.Uint16:
if err := t.setUIntXValue(fm.DftValue, 16, fn, fValue); err != nil {
return err
}
continue
case reflect.Uint32:
if err := t.setUIntXValue(fm.DftValue, 32, fn, fValue); err != nil {
return err
}
continue
case reflect.Uint64:
if err := t.setUIntXValue(fm.DftValue, 64, fn, fValue); err != nil {
return err
}
continue
case reflect.Float32:
if err := t.setFloatXValue(fm.DftValue, 32, fn, fValue); err != nil {
return err
}
continue
case reflect.Float64:
if err := t.setFloatXValue(fm.DftValue, 64, fn, fValue); err != nil {
return err
}
continue
case reflect.String:
fValue.SetString(fm.DftValue)
continue
// case reflect.Ptr:
// case reflect.Struct:
default:
logs.Warn("this field[%s] has default setting, but we don't support this type: %s",
fn, fValue.Kind().String())
}
}
return nil
}
func (t *TagAutoWireBeanFactory) setFloatXValue(dftValue string, bitSize int, fn string, fv reflect.Value) error {
if v, err := strconv.ParseFloat(dftValue, bitSize); err != nil {
return errors.WithMessage(err,
fmt.Sprintf("can not convert the field[%s]'s default value[%s] to float%d value",
fn, dftValue, bitSize))
} else {
fv.SetFloat(v)
return nil
}
}
func (t *TagAutoWireBeanFactory) setUIntXValue(dftValue string, bitSize int, fn string, fv reflect.Value) error {
if v, err := strconv.ParseUint(dftValue, 10, bitSize); err != nil {
return errors.WithMessage(err,
fmt.Sprintf("can not convert the field[%s]'s default value[%s] to uint%d value",
fn, dftValue, bitSize))
} else {
fv.SetUint(v)
return nil
}
}
func (t *TagAutoWireBeanFactory) setIntXValue(dftValue string, bitSize int, fn string, fv reflect.Value) error {
if v, err := strconv.ParseInt(dftValue, 10, bitSize); err != nil {
return errors.WithMessage(err,
fmt.Sprintf("can not convert the field[%s]'s default value[%s] to int%d value",
fn, dftValue, bitSize))
} else {
fv.SetInt(v)
return nil
}
}
func (t *TagAutoWireBeanFactory) needInject(fValue reflect.Value) bool {
return fValue.IsZero()
}
// getConfig never return nil
func (t *TagAutoWireBeanFactory) getConfig(beanValue reflect.Value) *BeanMetadata {
fms := make(map[string]*FieldMetadata, beanValue.NumField())
for i := 0; i < beanValue.NumField(); i++ {
// f => StructField
f := beanValue.Type().Field(i)
fms[f.Name] = t.FieldTagParser(f)
}
return &BeanMetadata{
Fields: fms,
}
}