/
reflect.go
384 lines (356 loc) · 8.77 KB
/
reflect.go
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// Copyright Fuzamei Corp. 2018 All Rights Reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package types
import (
"encoding/json"
"errors"
"fmt"
"reflect"
"strings"
"sync"
"unicode"
"unicode/utf8"
proto "github.com/golang/protobuf/proto"
)
//QueryFunc support query
var QueryFunc = NewQueryData("Query_")
func buildFuncList(funclist []interface{}) map[string]bool {
list := make(map[string]bool)
for i := 0; i < len(funclist); i++ {
tyname := reflect.TypeOf(funclist[i]).Elem().Name()
datas := strings.Split(tyname, "_")
if len(datas) != 2 {
continue
}
list["Get"+datas[1]] = true
}
return list
}
// Is this an exported - upper case - name?
func isExported(name string) bool {
rune, _ := utf8.DecodeRuneInString(name)
return unicode.IsUpper(rune)
}
// ListActionMethod list action的所有的方法
func ListActionMethod(action interface{}, funclist []interface{}) map[string]reflect.Method {
typ := reflect.TypeOf(action)
flist := buildFuncList(funclist)
methods := make(map[string]reflect.Method)
for m := 0; m < typ.NumMethod(); m++ {
method := typ.Method(m)
//mtype := method.Type
mname := method.Name
// Method must be exported.
if method.PkgPath != "" || !isExported(mname) {
continue
}
if mname == "GetValue" {
methods[mname] = method
continue
}
if flist[mname] {
methods[mname] = method
}
}
return methods
}
// ListType list type
func ListType(tys []interface{}) map[string]reflect.Type {
typelist := make(map[string]reflect.Type)
for _, ty := range tys {
typ := reflect.TypeOf(ty).Elem()
typelist[typ.Name()] = typ
}
return typelist
}
// ListMethod list Method
func ListMethod(action interface{}) map[string]reflect.Method {
typ := reflect.TypeOf(action)
return ListMethodByType(typ)
}
// ListMethodByType list Method 通过type类型
func ListMethodByType(typ reflect.Type) map[string]reflect.Method {
methods := make(map[string]reflect.Method)
for m := 0; m < typ.NumMethod(); m++ {
method := typ.Method(m)
//mtype := method.Type
mname := method.Name
// Method must be exported.
if method.PkgPath != "" || !isExported(mname) {
continue
}
methods[mname] = method
}
return methods
}
var nilValue = reflect.ValueOf(nil)
// GetActionValue 获取执行器的action value
func GetActionValue(action interface{}, funclist map[string]reflect.Method) (vname string, vty int32, v reflect.Value, err error) {
defer func() {
if e := recover(); e != nil {
vname = ""
vty = 0
v = nilValue
err = ErrDecode
}
}()
var ty int32
if a, ok := action.(execTypeGet); ok {
ty = a.GetTy()
}
value := reflect.ValueOf(action)
if _, ok := funclist["GetValue"]; !ok {
return "", 0, nilValue, ErrDecode
}
rcvr := funclist["GetValue"].Func.Call([]reflect.Value{value})
elem := rcvr[0].Elem()
sname := elem.Type().String()
index := strings.LastIndex(sname, "_")
if index == -1 || index == (len(sname)-1) {
return "", 0, nilValue, ErrDecode
}
tyname := sname[index+1:]
funcname := "Get" + tyname
if _, ok := funclist[funcname]; !ok {
return "", 0, nilValue, ErrDecode
}
val := funclist[funcname].Func.Call([]reflect.Value{value})
if len(val) == 0 || val[0].IsNil() {
return "", 0, nilValue, ErrDecode
}
return tyname, ty, val[0], nil
}
// IsOK 是否存在
func IsOK(list []reflect.Value, n int) bool {
if len(list) != n {
return false
}
for i := 0; i < len(list); i++ {
if !IsNil(list[i]) && !list[i].CanInterface() {
return false
}
}
return true
}
// CallQueryFunc 获取查询接口函数
func CallQueryFunc(this reflect.Value, f reflect.Method, in Message) (reply Message, err error) {
valueret := f.Func.Call([]reflect.Value{this, reflect.ValueOf(in)})
if len(valueret) != 2 {
return nil, ErrMethodNotFound
}
if !valueret[0].CanInterface() {
return nil, ErrMethodNotFound
}
if !valueret[1].CanInterface() {
return nil, ErrMethodNotFound
}
r1 := valueret[0].Interface()
if r1 != nil {
if r, ok := r1.(Message); ok {
reply = r
} else {
return nil, ErrMethodReturnType
}
}
//参数2
r2 := valueret[1].Interface()
if r2 != nil {
if r, ok := r2.(error); ok {
err = r
} else {
return nil, ErrMethodReturnType
}
}
if reply == nil && err == nil {
return nil, ErrActionNotSupport
}
return reply, err
}
// BuildQueryType 构建查询方法
func BuildQueryType(prefix string, methods map[string]reflect.Method) (map[string]reflect.Method, map[string]reflect.Type) {
tys := make(map[string]reflect.Type)
ms := make(map[string]reflect.Method)
for name, method := range methods {
if !strings.HasPrefix(name, prefix) {
continue
}
ty := method.Type
if ty.NumIn() != 2 {
continue
}
paramIn := ty.In(1)
if paramIn.Kind() != reflect.Ptr {
continue
}
p := reflect.New(ty.In(1).Elem())
queryin := p.Interface()
if _, ok := queryin.(proto.Message); !ok {
continue
}
if ty.NumOut() != 2 {
continue
}
if !ty.Out(0).AssignableTo(reflect.TypeOf((*proto.Message)(nil)).Elem()) {
continue
}
if !ty.Out(1).AssignableTo(reflect.TypeOf((*error)(nil)).Elem()) {
continue
}
name = name[len(prefix):]
tys[name] = ty
ms[name] = method
}
return ms, tys
}
// QueryData 查询结构体
type QueryData struct {
sync.RWMutex
prefix string
funcMap map[string]map[string]reflect.Method
typeMap map[string]map[string]reflect.Type
valueMap map[string]reflect.Value
}
// NewQueryData new一个新的QueryData
func NewQueryData(prefix string) *QueryData {
data := &QueryData{
prefix: prefix,
funcMap: make(map[string]map[string]reflect.Method),
typeMap: make(map[string]map[string]reflect.Type),
valueMap: make(map[string]reflect.Value),
}
return data
}
// Register 注册
func (q *QueryData) Register(key string, obj interface{}) {
if _, existed := q.funcMap[key]; existed {
panic(fmt.Sprintf("QueryData Register dup for key=%s", key))
}
q.funcMap[key], q.typeMap[key] = BuildQueryType(q.prefix, ListMethod(obj))
}
// SetThis 设置
func (q *QueryData) SetThis(key string, this reflect.Value) {
q.Lock()
defer q.Unlock()
q.valueMap[key] = this
}
func (q *QueryData) getThis(key string) (reflect.Value, bool) {
q.RLock()
defer q.RUnlock()
v, ok := q.valueMap[key]
return v, ok
}
// GetFunc 获取函数
func (q *QueryData) GetFunc(driver, name string) (reflect.Method, error) {
funclist, ok := q.funcMap[driver]
if !ok {
return reflect.Method{}, ErrActionNotSupport
}
if f, ok := funclist[name]; ok {
return f, nil
}
return reflect.Method{}, ErrActionNotSupport
}
// GetType 获取类型
func (q *QueryData) GetType(driver, name string) (reflect.Type, error) {
typelist, ok := q.typeMap[driver]
if !ok {
return nil, ErrActionNotSupport
}
if t, ok := typelist[name]; ok {
return t, nil
}
return nil, ErrActionNotSupport
}
// Decode 编码
func (q *QueryData) Decode(driver, name string, in []byte) (reply Message, err error) {
ty, err := q.GetType(driver, name)
if err != nil {
return nil, err
}
p := reflect.New(ty.In(1).Elem())
queryin := p.Interface()
if paramIn, ok := queryin.(proto.Message); ok {
err = Decode(in, paramIn)
return paramIn, err
}
return nil, ErrActionNotSupport
}
// DecodeJSON 编码成json格式
func (q *QueryData) DecodeJSON(driver, name string, in json.Marshaler) (reply Message, err error) {
ty, err := q.GetType(driver, name)
if err != nil {
return nil, err
}
p := reflect.New(ty.In(1).Elem())
queryin := p.Interface()
if paramIn, ok := queryin.(proto.Message); ok {
data, err := in.MarshalJSON()
if err != nil {
return nil, err
}
err = JSONToPB(data, paramIn)
return paramIn, err
}
return nil, ErrActionNotSupport
}
// Call 查询函数回调
func (q *QueryData) Call(driver, name string, in Message) (reply Message, err error) {
defer func() {
if r := recover(); r != nil {
tlog.Error("query data call error", "driver", driver, "name", name, "param", in, "msg", r)
switch x := r.(type) {
case string:
err = errors.New(x)
case error:
err = x
default:
err = errors.New("Unknown panic")
}
reply = nil
}
}()
f, err := q.GetFunc(driver, name)
if err != nil {
return nil, err
}
m, ok := q.getThis(driver)
if !ok {
return nil, ErrQueryThistIsNotSet
}
return CallQueryFunc(m, f, in)
}
//IsNil 判断所有的空值
func IsNil(a interface{}) (ok bool) {
defer func() {
if e := recover(); e != nil {
ok = false
}
}()
if v, ok := a.(reflect.Value); ok {
if !v.IsValid() {
return true
}
return v.IsNil()
}
return a == nil || reflect.ValueOf(a).IsNil()
}
//IsNilP 空指针或者接口
func IsNilP(a interface{}) bool {
if a == nil {
return true
}
var v reflect.Value
if val, ok := a.(reflect.Value); ok {
v = val
} else {
v = reflect.ValueOf(a)
}
if !v.IsValid() {
return true
}
if v.Kind() == reflect.Interface || v.Kind() == reflect.Ptr {
return v.IsNil()
}
return false
}