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DboProxy.go
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DboProxy.go
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package sqlte
import (
"errors"
"fmt"
"github.com/go-xe2/x/os/xlog"
"reflect"
"strings"
)
type FunArg struct {
Name string
Index int
}
//代理数据
type FunProxyArg struct {
FunArgs []FunArg
FunArgsLen int
Args []reflect.Value
ArgsLen int
}
func (it FunProxyArg)New(tagArgs []FunArg,args []reflect.Value) FunProxyArg {
return FunProxyArg{
FunArgs:tagArgs,
Args:args,
FunArgsLen: len(tagArgs),
ArgsLen: len(args),
}
}
func DboProxy(dbo interface{}, buildFunc func(funcField reflect.StructField, field reflect.Value) func(arg FunProxyArg) []reflect.Value) {
v := reflect.ValueOf(dbo)
if v.Kind() != reflect.Ptr {
panic("DboProxy代理对象参数dbo只能传入指针类型")
}
buildProxy(v, buildFunc)
}
func buildProxy(v reflect.Value, buildFunc func(funcField reflect.StructField, field reflect.Value) func(arg FunProxyArg) []reflect.Value) {
for {
if v.Kind() == reflect.Ptr {
v = v.Elem()
} else {
break
}
}
t := v.Type()
et := t
if et.Kind() == reflect.Ptr {
et = et.Elem()
}
ptr := v
var obj reflect.Value
if ptr.Kind() == reflect.Ptr {
obj = ptr.Elem()
} else {
obj = ptr
}
count := obj.NumField()
for i := 0; i < count; i++ {
f := obj.Field(i)
ft := f.Type()
sf := et.Field(i)
if ft.Kind() == reflect.Ptr {
ft = ft.Elem()
}
if f.CanSet() {
switch ft.Kind() {
case reflect.Struct:
if buildFunc != nil {
buildProxy(f, buildFunc) //循环扫描字段
}
case reflect.Func:
if buildFunc != nil {
bindProxyFunc(v, f, ft, sf, buildFunc(sf, f))
}
}
}
}
if t.Kind() == reflect.Ptr {
v.Set(ptr)
} else {
v.Set(obj)
}
}
// bindProxyFunc 绑定代理方法
func bindProxyFunc(source reflect.Value, f reflect.Value, ft reflect.Type, sf reflect.StructField, proxyFunc func(arg FunProxyArg) []reflect.Value) {
// 获取方法参数,创建代理参数列表
var tagParams []string
var args = sf.Tag.Get(`args`)
argLen := ft.NumIn()
var tagArgs = make([]FunArg, 0, argLen)
if args != `` {
tagParams = strings.Split(args, `,`)
var tagParamsLen = len(tagParams)
if tagParamsLen != ft.NumIn() {
panic(fmt.Errorf("函当字段%s tags设置与输入参数不一致,期望%d实际长度%d",sf.Name, argLen, tagParamsLen))
}
if tagParamsLen != 0 {
for index, v := range tagParams {
var tagArg = FunArg{
Index: index,
Name: v,
}
tagArgs = append(tagArgs, tagArg)
}
}
} else {
for i := 0; i < argLen; i++ {
tagArgs = append(tagArgs, FunArg{
Name: fmt.Sprintf("arg%d", i),
Index: i,
})
}
}
var tagArgsLen = len(tagArgs)
if tagArgsLen > 0 && argLen != tagArgsLen {
panic(fmt.Errorf("函当字段%s tags设置与输入参数不一致,期望%d实际长度%d",sf.Name, argLen, tagArgsLen))
}
var fn = func(args []reflect.Value) (results []reflect.Value) {
// 调用代理函数处理返回结果
proxyResults := proxyFunc(FunProxyArg{}.New(tagArgs, args))
for _, returnV := range proxyResults {
results = append(results, returnV)
}
return results
}
if f.Kind() == reflect.Ptr {
fp := reflect.New(ft)
fp.Elem().Set(reflect.MakeFunc(ft, fn))
f.Set(fp)
} else {
f.Set(reflect.MakeFunc(ft, fn))
}
}
func TestProxyBuildFunc(funcField reflect.StructField, field reflect.Value) func(arg FunProxyArg) []reflect.Value {
return func(arg FunProxyArg) []reflect.Value {
fmt.Println("====>> do func name:", funcField.Name)
xlog.Info("传入参数名:", arg.FunArgs, "参数个数:", arg.FunArgsLen)
for i := 0; i < arg.ArgsLen; i++ {
fmt.Println(arg.FunArgs[i].Name, "=", arg.Args[i].Interface())
}
var e error
fmt.Println("funcField.Type.NumOut:", field.Type().NumOut())
var returns = make([]reflect.Value, 0)
if len(arg.Args) == 0 {
e = errors.New("参数个数不能为0")
} else {
returns = append(returns, reflect.ValueOf(fmt.Sprintf("返回第1个参数值=%v",arg.Args[0].Interface())))
}
if e == nil {
returns = append(returns, reflect.Zero(reflect.TypeOf(&e).Elem()))
} else {
returns = append(returns, reflect.ValueOf(&e).Elem())
}
return returns
}
}