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hub.go
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hub.go
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package rpchub
import (
"encoding/binary"
"fmt"
"math"
"reflect"
"strings"
"github.com/eaciit/toolkit"
)
type Hub struct {
fns map[string]reflect.Value
log *toolkit.LogEngine
}
func NewHub() *Hub {
r := new(Hub)
return r
}
func SetHubLog(r *Hub, l *toolkit.LogEngine) *Hub {
r.log = l
return r
}
func HubLog(p *Hub) *toolkit.LogEngine {
if p.log == nil {
p.log = toolkit.NewLogEngine(true, false, "", "", "")
}
return p.log
}
func (r *Hub) Call(request Request, response *Response) error {
var err error
name := strings.ToLower(request.Name)
func() {
defer func() {
if rec := recover(); rec != nil {
err = fmt.Errorf("%s panic error. %v", name, rec)
}
}()
if r.fns == nil {
err = fmt.Errorf("%s error. invalid initialization", name)
return
}
fn, ok := r.fns[name]
if !ok {
err = fmt.Errorf("service %s is not exist", name)
return
}
var ins []reflect.Value
var outs []reflect.Value
if len(request.Parm) > 0 {
ins = make([]reflect.Value, len(request.Parm))
for idx, parm := range request.Parm {
ins[idx] = reflect.ValueOf(parm)
}
}
//fmt.Println("call", name, "number of parms", len(request.Parm), "raw:", ins, "json:", toolkit.JsonString(ins))
outs = fn.Call(ins)
o := outs[0]
t := o.Type()
k := t.Kind()
//fmt.Println("return type:", t.String())
if t.String() == "[]uint8" {
response.Data = o.Interface().([]byte)
} else if k == reflect.String {
response.Data = []byte(o.String())
} else if k == reflect.Int || k == reflect.Int8 ||
k == reflect.Int16 || k == reflect.Int32 || k == reflect.Int64 {
response.Data = IntToBytes(o.Int())
} else if k == reflect.Float32 || k == reflect.Float64 {
response.Data = FloatToBytes(o.Float())
} else {
response.Data = toolkit.ToBytes(outs[0].Interface(), "")
}
}()
return err
}
func RegisterToHub(hub *Hub, objs ...interface{}) *Hub {
if hub == nil {
hub = NewHub()
}
for _, obj := range objs {
registerObjToHub(hub, obj)
}
return hub
}
func registerObjToHub(hub *Hub, obj interface{}) error {
rv := reflect.ValueOf(obj)
rt := rv.Type()
fnCount := rv.NumMethod()
HubLog(hub).Infof("registering object to Hub: %s. %d method(s) found",
rt.Elem().Name(), fnCount)
for i := 0; i < fnCount; i++ {
fn := rv.Method(i)
ft := rt.Method(i)
fnName := strings.ToLower(fmt.Sprintf("%s.%s",
rt.Elem().Name(), ft.Name))
if hub.fns == nil {
hub.fns = map[string]reflect.Value{}
}
hub.fns[fnName] = fn
HubLog(hub).Infof("adding to RPC Hub: %s", fnName)
}
return nil
}
func IntToBytes(v int64) []byte {
i := uint64(v)
bs := make([]byte, 8)
binary.LittleEndian.PutUint64(bs, i)
return bs
}
func BytesToInt(bs []byte) int64 {
return int64(binary.LittleEndian.Uint64(bs))
}
func FloatToBytes(v float64) []byte {
bs := make([]byte, 8)
fb := math.Float64bits(v)
binary.LittleEndian.PutUint64(bs[:], fb)
return bs
}
func BytesToFloat(bs []byte) float64 {
bits := binary.LittleEndian.Uint64(bs)
return math.Float64frombits(bits)
}