133 lines
3.2 KiB
Go
133 lines
3.2 KiB
Go
package chain
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import (
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"errors"
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"fmt"
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"reflect"
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"github.com/ipfs/go-cid"
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)
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type invoker struct {
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builtInCode map[cid.Cid]nativeCode
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}
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type invokeFunc func(act *Actor, vmctx *VMContext, params []byte) (InvokeRet, error)
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type nativeCode []invokeFunc
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type InvokeRet struct {
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result []byte
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returnCode byte
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}
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func newInvoker() *invoker {
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inv := &invoker{
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builtInCode: make(map[cid.Cid]nativeCode),
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}
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// add builtInCode using: register(cid, singleton)
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return inv
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}
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func (inv *invoker) Invoke(act *Actor, vmctx *VMContext, method uint64, params []byte) (InvokeRet, error) {
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code, ok := inv.builtInCode[act.Code]
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if !ok {
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return InvokeRet{}, errors.New("no code for actor")
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}
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if method >= uint64(len(code)) || code[method] == nil {
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return InvokeRet{}, fmt.Errorf("no method %d on actor", method)
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}
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return code[method](act, vmctx, params)
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}
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func (inv *invoker) register(c cid.Cid, instance Invokee) {
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code, err := inv.transform(instance)
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if err != nil {
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panic(err)
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}
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inv.builtInCode[c] = code
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}
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type unmarshalCBOR interface {
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UnmarshalCBOR([]byte) (int, error)
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}
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type Invokee interface {
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Exports() []interface{}
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}
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var tUnmarhsalCBOR = reflect.TypeOf((*unmarshalCBOR)(nil)).Elem()
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var tError = reflect.TypeOf((*error)(nil)).Elem()
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func (*invoker) transform(instance Invokee) (nativeCode, error) {
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itype := reflect.TypeOf(instance)
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exports := instance.Exports()
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for i, m := range exports {
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i := i
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newErr := func(str string) error {
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return fmt.Errorf("transform(%s) export(%d): %s", itype.Name(), i, str)
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}
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if m == nil {
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continue
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}
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meth := reflect.ValueOf(m)
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t := meth.Type()
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if t.Kind() != reflect.Func {
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return nil, newErr("is not a function")
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}
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if t.NumIn() != 3 {
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return nil, newErr("wrong number of inputs should be: " +
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"*Actor, *VMContext, <type of parameter>")
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}
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if t.In(0) != reflect.TypeOf(&Actor{}) {
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return nil, newErr("first arguemnt should be *Actor")
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}
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if t.In(1) != reflect.TypeOf(&VMContext{}) {
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return nil, newErr("second argument should be *VMContext")
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}
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if !t.In(2).Implements(tUnmarhsalCBOR) {
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return nil, newErr("parameter doesn't implement UnmarshalCBOR")
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}
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if t.In(2).Kind() != reflect.Ptr {
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return nil, newErr("parameter has to be a pointer")
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}
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if t.NumOut() != 2 {
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return nil, newErr("wrong number of outputs should be: " +
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"(InvokeRet, error)")
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}
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if t.Out(0) != reflect.TypeOf(InvokeRet{}) {
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return nil, newErr("first output should be of type InvokeRet")
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}
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if !t.Out(1).Implements(tError) {
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return nil, newErr("second output should be error type")
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}
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}
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code := make(nativeCode, len(exports))
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for id, m := range exports {
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meth := reflect.ValueOf(m)
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code[id] = reflect.MakeFunc(reflect.TypeOf((invokeFunc)(nil)),
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func(in []reflect.Value) []reflect.Value {
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paramT := meth.Type().In(2).Elem()
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param := reflect.New(paramT)
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inBytes := in[2].Interface().([]byte)
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_, err := param.Interface().(unmarshalCBOR).UnmarshalCBOR(inBytes)
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if err != nil {
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return []reflect.Value{
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reflect.ValueOf(InvokeRet{}),
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reflect.ValueOf(err),
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}
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}
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return meth.Call([]reflect.Value{
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in[0], in[1], param,
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})
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}).Interface().(invokeFunc)
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}
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return code, nil
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}
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