package vm import ( "bytes" "encoding/hex" "fmt" "reflect" "github.com/filecoin-project/go-state-types/exitcode" "github.com/filecoin-project/specs-actors/actors/builtin/account" "github.com/filecoin-project/specs-actors/actors/builtin/verifreg" "github.com/ipfs/go-cid" cbg "github.com/whyrusleeping/cbor-gen" "golang.org/x/xerrors" "github.com/filecoin-project/go-state-types/abi" "github.com/filecoin-project/lotus/chain/actors/aerrors" "github.com/filecoin-project/specs-actors/actors/builtin" "github.com/filecoin-project/specs-actors/actors/builtin/cron" init_ "github.com/filecoin-project/specs-actors/actors/builtin/init" "github.com/filecoin-project/specs-actors/actors/builtin/market" "github.com/filecoin-project/specs-actors/actors/builtin/miner" "github.com/filecoin-project/specs-actors/actors/builtin/multisig" "github.com/filecoin-project/specs-actors/actors/builtin/paych" "github.com/filecoin-project/specs-actors/actors/builtin/power" "github.com/filecoin-project/specs-actors/actors/builtin/reward" "github.com/filecoin-project/specs-actors/actors/builtin/system" "github.com/filecoin-project/specs-actors/actors/runtime" vmr "github.com/filecoin-project/specs-actors/actors/runtime" ) type Invoker struct { builtInCode map[cid.Cid]nativeCode builtInState map[cid.Cid]reflect.Type } type invokeFunc func(rt runtime.Runtime, params []byte) ([]byte, aerrors.ActorError) type nativeCode []invokeFunc func NewInvoker() *Invoker { inv := &Invoker{ builtInCode: make(map[cid.Cid]nativeCode), builtInState: make(map[cid.Cid]reflect.Type), } // add builtInCode using: register(cid, singleton) inv.Register(builtin.SystemActorCodeID, system.Actor{}, abi.EmptyValue{}) inv.Register(builtin.InitActorCodeID, init_.Actor{}, init_.State{}) inv.Register(builtin.RewardActorCodeID, reward.Actor{}, reward.State{}) inv.Register(builtin.CronActorCodeID, cron.Actor{}, cron.State{}) inv.Register(builtin.StoragePowerActorCodeID, power.Actor{}, power.State{}) inv.Register(builtin.StorageMarketActorCodeID, market.Actor{}, market.State{}) inv.Register(builtin.StorageMinerActorCodeID, miner.Actor{}, miner.State{}) inv.Register(builtin.MultisigActorCodeID, multisig.Actor{}, multisig.State{}) inv.Register(builtin.PaymentChannelActorCodeID, paych.Actor{}, paych.State{}) inv.Register(builtin.VerifiedRegistryActorCodeID, verifreg.Actor{}, verifreg.State{}) inv.Register(builtin.AccountActorCodeID, account.Actor{}, account.State{}) return inv } func (inv *Invoker) Invoke(codeCid cid.Cid, rt runtime.Runtime, method abi.MethodNum, params []byte) ([]byte, aerrors.ActorError) { code, ok := inv.builtInCode[codeCid] if !ok { log.Errorf("no code for actor %s (Addr: %s)", codeCid, rt.Receiver()) return nil, aerrors.Newf(exitcode.SysErrorIllegalActor, "no code for actor %s(%d)(%s)", codeCid, method, hex.EncodeToString(params)) } if method >= abi.MethodNum(len(code)) || code[method] == nil { return nil, aerrors.Newf(exitcode.SysErrInvalidMethod, "no method %d on actor", method) } return code[method](rt, params) } func (inv *Invoker) Register(c cid.Cid, instance Invokee, state interface{}) { code, err := inv.transform(instance) if err != nil { panic(xerrors.Errorf("%s: %w", string(c.Hash()), err)) } inv.builtInCode[c] = code inv.builtInState[c] = reflect.TypeOf(state) } type Invokee interface { Exports() []interface{} } func (*Invoker) transform(instance Invokee) (nativeCode, error) { itype := reflect.TypeOf(instance) exports := instance.Exports() for i, m := range exports { i := i newErr := func(format string, args ...interface{}) error { str := fmt.Sprintf(format, args...) return fmt.Errorf("transform(%s) export(%d): %s", itype.Name(), i, str) } if m == nil { continue } meth := reflect.ValueOf(m) t := meth.Type() if t.Kind() != reflect.Func { return nil, newErr("is not a function") } if t.NumIn() != 2 { return nil, newErr("wrong number of inputs should be: " + "vmr.Runtime, ") } if t.In(0) != reflect.TypeOf((*vmr.Runtime)(nil)).Elem() { return nil, newErr("first arguemnt should be vmr.Runtime") } if t.In(1).Kind() != reflect.Ptr { return nil, newErr("second argument should be of kind reflect.Ptr") } if t.NumOut() != 1 { return nil, newErr("wrong number of outputs should be: " + "cbg.CBORMarshaler") } o0 := t.Out(0) if !o0.Implements(reflect.TypeOf((*cbg.CBORMarshaler)(nil)).Elem()) { return nil, newErr("output needs to implement cgb.CBORMarshaler") } } code := make(nativeCode, len(exports)) for id, m := range exports { if m == nil { continue } meth := reflect.ValueOf(m) code[id] = reflect.MakeFunc(reflect.TypeOf((invokeFunc)(nil)), func(in []reflect.Value) []reflect.Value { paramT := meth.Type().In(1).Elem() param := reflect.New(paramT) inBytes := in[1].Interface().([]byte) if err := DecodeParams(inBytes, param.Interface()); err != nil { aerr := aerrors.Absorb(err, 1, "failed to decode parameters") return []reflect.Value{ reflect.ValueOf([]byte{}), // Below is a hack, fixed in Go 1.13 // https://git.io/fjXU6 reflect.ValueOf(&aerr).Elem(), } } rt := in[0].Interface().(*Runtime) rval, aerror := rt.shimCall(func() interface{} { ret := meth.Call([]reflect.Value{ reflect.ValueOf(rt), param, }) return ret[0].Interface() }) return []reflect.Value{ reflect.ValueOf(&rval).Elem(), reflect.ValueOf(&aerror).Elem(), } }).Interface().(invokeFunc) } return code, nil } func DecodeParams(b []byte, out interface{}) error { um, ok := out.(cbg.CBORUnmarshaler) if !ok { return fmt.Errorf("type %T does not implement UnmarshalCBOR", out) } return um.UnmarshalCBOR(bytes.NewReader(b)) } func DumpActorState(code cid.Cid, b []byte) (interface{}, error) { if code == builtin.AccountActorCodeID { // Account code special case return nil, nil } i := NewInvoker() // TODO: register builtins in init block typ, ok := i.builtInState[code] if !ok { return nil, xerrors.Errorf("state type for actor %s not found", code) } rv := reflect.New(typ) um, ok := rv.Interface().(cbg.CBORUnmarshaler) if !ok { return nil, xerrors.New("state type does not implement CBORUnmarshaler") } if err := um.UnmarshalCBOR(bytes.NewReader(b)); err != nil { return nil, xerrors.Errorf("unmarshaling actor state: %w", err) } return rv.Elem().Interface(), nil }