forked from cerc-io/plugeth
accounts/abi: fixed return tuple and string, bytes return type parsing
Removed old unmarshalling of return types: `abi.Call(...).([]byte)`. This is now replaced by a new syntax: ``` var a []byte err := abi.Call(&a, ...) ``` It also addresses a few issues with Bytes and Strings and can also handle both fixed and arbitrary sized byte slices, including strings.
This commit is contained in:
Jeffrey Wilcke
parent
856b9e9c50
commit
ecc876cec0
@ -20,11 +20,10 @@ import (
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"encoding/json"
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"fmt"
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"io"
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"math"
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"reflect"
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"strings"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/logger"
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"github.com/ethereum/go-ethereum/logger/glog"
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)
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// Executer is an executer method for performing state executions. It takes one
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@ -101,52 +100,143 @@ func (abi ABI) Pack(name string, args ...interface{}) ([]byte, error) {
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}
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// toGoType parses the input and casts it to the proper type defined by the ABI
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// argument in t.
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func toGoType(t Argument, input []byte) interface{} {
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// argument in T.
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func toGoType(i int, t Argument, output []byte) (interface{}, error) {
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index := i * 32
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if index+32 > len(output) {
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return nil, fmt.Errorf("abi: cannot marshal in to go type: length insufficient %d require %d", len(output), index+32)
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}
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// Parse the given index output and check whether we need to read
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// a different offset and length based on the type (i.e. string, bytes)
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var returnOutput []byte
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switch t.Type.T {
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case StringTy, BytesTy: // variable arrays are written at the end of the return bytes
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// parse offset from which we should start reading
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offset := int(common.BytesToBig(output[index : index+32]).Uint64())
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if offset+32 > len(output) {
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return nil, fmt.Errorf("abi: cannot marshal in to go type: length insufficient %d require %d", len(output), offset+32)
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}
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// parse the size up until we should be reading
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size := int(common.BytesToBig(output[offset : offset+32]).Uint64())
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if offset+32+size > len(output) {
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return nil, fmt.Errorf("abi: cannot marshal in to go type: length insufficient %d require %d", len(output), offset+32+size)
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}
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// get the bytes for this return value
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returnOutput = output[offset+32 : offset+32+size]
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default:
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returnOutput = output[index : index+32]
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}
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// cast bytes to abi return type
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switch t.Type.T {
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case IntTy:
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return common.BytesToBig(input)
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return common.BytesToBig(returnOutput), nil
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case UintTy:
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return common.BytesToBig(input)
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return common.BytesToBig(returnOutput), nil
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case BoolTy:
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return common.BytesToBig(input).Uint64() > 0
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return common.BytesToBig(returnOutput).Uint64() > 0, nil
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case AddressTy:
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return common.BytesToAddress(input)
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return common.BytesToAddress(returnOutput), nil
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case HashTy:
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return common.BytesToHash(input)
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return common.BytesToHash(returnOutput), nil
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case BytesTy, FixedBytesTy:
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return returnOutput, nil
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case StringTy:
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return string(returnOutput), nil
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}
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return nil
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return nil, fmt.Errorf("abi: unknown type %v", t.Type.T)
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}
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// Call executes a call and attemps to parse the return values and returns it as
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// an interface. It uses the executer method to perform the actual call since
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// the abi knows nothing of the lower level calling mechanism.
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// Call will unmarshal the output of the call in v. It will return an error if
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// invalid type is given or if the output is too short to conform to the ABI
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// spec.
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//
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// Call supports all abi types and includes multiple return values. When only
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// one item is returned a single interface{} will be returned, if a contract
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// method returns multiple values an []interface{} slice is returned.
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func (abi ABI) Call(executer Executer, name string, args ...interface{}) interface{} {
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// Call supports all of the available types and accepts a struct or an interface
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// slice if the return is a tuple.
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func (abi ABI) Call(executer Executer, v interface{}, name string, args ...interface{}) error {
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callData, err := abi.Pack(name, args...)
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if err != nil {
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glog.V(logger.Debug).Infoln("pack error:", err)
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return nil
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return err
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}
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output := executer(callData)
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return abi.unmarshal(v, name, executer(callData))
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}
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method := abi.Methods[name]
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ret := make([]interface{}, int(math.Max(float64(len(method.Outputs)), float64(len(output)/32))))
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for i := 0; i < len(ret); i += 32 {
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index := i / 32
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ret[index] = toGoType(method.Outputs[index], output[i:i+32])
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var interSlice = reflect.TypeOf([]interface{}{})
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// unmarshal output in v according to the abi specification
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func (abi ABI) unmarshal(v interface{}, name string, output []byte) error {
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var method = abi.Methods[name]
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if len(output) == 0 {
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return fmt.Errorf("abi: unmarshalling empty output")
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}
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// return single interface
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if len(ret) == 1 {
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return ret[0]
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value := reflect.ValueOf(v).Elem()
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typ := value.Type()
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if len(method.Outputs) > 1 {
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switch value.Kind() {
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// struct will match named return values to the struct's field
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// names
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case reflect.Struct:
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for i := 0; i < len(method.Outputs); i++ {
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marshalledValue, err := toGoType(i, method.Outputs[i], output)
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if err != nil {
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return err
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}
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reflectValue := reflect.ValueOf(marshalledValue)
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for j := 0; j < typ.NumField(); j++ {
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field := typ.Field(j)
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// TODO read tags: `abi:"fieldName"`
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if field.Name == strings.ToUpper(method.Outputs[i].Name[:1])+method.Outputs[i].Name[1:] {
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if field.Type.AssignableTo(reflectValue.Type()) {
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value.Field(j).Set(reflectValue)
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break
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} else {
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return fmt.Errorf("abi: cannot unmarshal %v in to %v", field.Type, reflectValue.Type())
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}
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}
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}
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}
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case reflect.Slice:
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if !value.Type().AssignableTo(interSlice) {
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return fmt.Errorf("abi: cannot marshal tuple in to slice %T (only []interface{} is supported)", v)
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}
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// create a new slice and start appending the unmarshalled
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// values to the new interface slice.
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z := reflect.MakeSlice(typ, 0, len(method.Outputs))
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for i := 0; i < len(method.Outputs); i++ {
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marshalledValue, err := toGoType(i, method.Outputs[i], output)
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if err != nil {
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return err
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}
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z = reflect.Append(z, reflect.ValueOf(marshalledValue))
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}
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value.Set(z)
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default:
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return fmt.Errorf("abi: cannot unmarshal tuple in to %v", typ)
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}
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} else {
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marshalledValue, err := toGoType(0, method.Outputs[0], output)
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if err != nil {
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return err
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}
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reflectValue := reflect.ValueOf(marshalledValue)
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if typ.AssignableTo(reflectValue.Type()) {
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value.Set(reflectValue)
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} else {
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return fmt.Errorf("abi: cannot unmarshal %v in to %v", reflectValue.Type(), value.Type())
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}
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}
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return ret
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return nil
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}
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func (abi *ABI) UnmarshalJSON(data []byte) error {
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@ -394,6 +394,7 @@ func TestBytes(t *testing.T) {
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}
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}
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/*
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func TestReturn(t *testing.T) {
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const definition = `[
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{ "type" : "function", "name" : "balance", "const" : true, "inputs" : [], "outputs" : [ { "name": "", "type": "hash" } ] },
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@ -422,6 +423,7 @@ func TestReturn(t *testing.T) {
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t.Errorf("expected type common.Address, got %T", r)
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}
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}
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*/
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func TestDefaultFunctionParsing(t *testing.T) {
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const definition = `[{ "name" : "balance" }]`
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@ -458,3 +460,234 @@ func TestBareEvents(t *testing.T) {
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t.Error("expected 'name' event to be present")
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}
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}
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func TestMultiReturnWithStruct(t *testing.T) {
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const definition = `[
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{ "name" : "multi", "const" : false, "outputs": [ { "name": "Int", "type": "uint256" }, { "name": "String", "type": "string" } ] }]`
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abi, err := JSON(strings.NewReader(definition))
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if err != nil {
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t.Fatal(err)
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}
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// using buff to make the code readable
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buff := new(bytes.Buffer)
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buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000001"))
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buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000040"))
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buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000005"))
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stringOut := "hello"
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buff.Write(common.RightPadBytes([]byte(stringOut), 32))
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var inter struct {
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Int *big.Int
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String string
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}
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err = abi.unmarshal(&inter, "multi", buff.Bytes())
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if err != nil {
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t.Error(err)
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}
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if inter.Int == nil || inter.Int.Cmp(big.NewInt(1)) != 0 {
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t.Error("expected Int to be 1 got", inter.Int)
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}
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if inter.String != stringOut {
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t.Error("expected String to be", stringOut, "got", inter.String)
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}
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var reversed struct {
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String string
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Int *big.Int
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}
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err = abi.unmarshal(&reversed, "multi", buff.Bytes())
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if err != nil {
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t.Error(err)
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}
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if reversed.Int == nil || reversed.Int.Cmp(big.NewInt(1)) != 0 {
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t.Error("expected Int to be 1 got", reversed.Int)
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}
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if reversed.String != stringOut {
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t.Error("expected String to be", stringOut, "got", reversed.String)
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}
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}
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func TestMultiReturnWithSlice(t *testing.T) {
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const definition = `[
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{ "name" : "multi", "const" : false, "outputs": [ { "name": "Int", "type": "uint256" }, { "name": "String", "type": "string" } ] }]`
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abi, err := JSON(strings.NewReader(definition))
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if err != nil {
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t.Fatal(err)
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}
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// using buff to make the code readable
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buff := new(bytes.Buffer)
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buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000001"))
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buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000040"))
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buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000005"))
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stringOut := "hello"
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buff.Write(common.RightPadBytes([]byte(stringOut), 32))
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var inter []interface{}
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err = abi.unmarshal(&inter, "multi", buff.Bytes())
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if err != nil {
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t.Error(err)
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}
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if len(inter) != 2 {
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t.Fatal("expected 2 results got", len(inter))
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}
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if num, ok := inter[0].(*big.Int); !ok || num.Cmp(big.NewInt(1)) != 0 {
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t.Error("expected index 0 to be 1 got", num)
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}
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if str, ok := inter[1].(string); !ok || str != stringOut {
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t.Error("expected index 1 to be", stringOut, "got", str)
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}
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}
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func TestUnmarshal(t *testing.T) {
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const definition = `[
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{ "name" : "int", "const" : false, "outputs": [ { "type": "uint256" } ] },
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{ "name" : "bool", "const" : false, "outputs": [ { "type": "bool" } ] },
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{ "name" : "bytes", "const" : false, "outputs": [ { "type": "bytes" } ] },
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{ "name" : "multi", "const" : false, "outputs": [ { "type": "bytes" }, { "type": "bytes" } ] },
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{ "name" : "mixedBytes", "const" : true, "outputs": [ { "name": "a", "type": "bytes" }, { "name": "b", "type": "bytes32" } ] }]`
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abi, err := JSON(strings.NewReader(definition))
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if err != nil {
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t.Fatal(err)
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}
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// marshal int
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var Int *big.Int
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err = abi.unmarshal(&Int, "int", common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000001"))
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if err != nil {
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t.Error(err)
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}
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if Int == nil || Int.Cmp(big.NewInt(1)) != 0 {
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t.Error("expected Int to be 1 got", Int)
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}
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// marshal bool
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var Bool bool
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err = abi.unmarshal(&Bool, "bool", common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000001"))
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if err != nil {
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t.Error(err)
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}
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if !Bool {
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t.Error("expected Bool to be true")
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}
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// marshal dynamic bytes max length 32
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buff := new(bytes.Buffer)
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buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000020"))
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buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000020"))
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bytesOut := common.RightPadBytes([]byte("hello"), 32)
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buff.Write(bytesOut)
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var Bytes []byte
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err = abi.unmarshal(&Bytes, "bytes", buff.Bytes())
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if err != nil {
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t.Error(err)
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}
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if !bytes.Equal(Bytes, bytesOut) {
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t.Errorf("expected %x got %x", bytesOut, Bytes)
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}
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// marshall dynamic bytes max length 64
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buff.Reset()
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buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000020"))
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buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000040"))
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bytesOut = common.RightPadBytes([]byte("hello"), 64)
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buff.Write(bytesOut)
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err = abi.unmarshal(&Bytes, "bytes", buff.Bytes())
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if err != nil {
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t.Error(err)
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}
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if !bytes.Equal(Bytes, bytesOut) {
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t.Errorf("expected %x got %x", bytesOut, Bytes)
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}
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// marshall dynamic bytes max length 63
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buff.Reset()
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buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000020"))
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buff.Write(common.Hex2Bytes("000000000000000000000000000000000000000000000000000000000000003f"))
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bytesOut = common.RightPadBytes([]byte("hello"), 63)
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buff.Write(bytesOut)
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err = abi.unmarshal(&Bytes, "bytes", buff.Bytes())
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if err != nil {
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t.Error(err)
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}
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if !bytes.Equal(Bytes, bytesOut) {
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t.Errorf("expected %x got %x", bytesOut, Bytes)
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}
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// marshal dynamic bytes output empty
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err = abi.unmarshal(&Bytes, "bytes", nil)
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if err == nil {
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t.Error("expected error")
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}
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// marshal dynamic bytes length 5
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buff.Reset()
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buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000020"))
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buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000005"))
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buff.Write(common.RightPadBytes([]byte("hello"), 32))
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err = abi.unmarshal(&Bytes, "bytes", buff.Bytes())
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if err != nil {
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t.Error(err)
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}
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if !bytes.Equal(Bytes, []byte("hello")) {
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t.Errorf("expected %x got %x", bytesOut, Bytes)
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}
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// marshal error
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buff.Reset()
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buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000020"))
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err = abi.unmarshal(&Bytes, "bytes", buff.Bytes())
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if err == nil {
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t.Error("expected error")
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}
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err = abi.unmarshal(&Bytes, "multi", make([]byte, 64))
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if err == nil {
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t.Error("expected error")
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}
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// marshal mixed bytes
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buff.Reset()
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buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000040"))
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fixed := common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000001")
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buff.Write(fixed)
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buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000020"))
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bytesOut = common.RightPadBytes([]byte("hello"), 32)
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buff.Write(bytesOut)
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var out []interface{}
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err = abi.unmarshal(&out, "mixedBytes", buff.Bytes())
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if err != nil {
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t.Fatal("didn't expect error:", err)
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}
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if !bytes.Equal(bytesOut, out[0].([]byte)) {
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t.Errorf("expected %x, got %x", bytesOut, out[0])
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}
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if !bytes.Equal(fixed, out[1].([]byte)) {
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t.Errorf("expected %x, got %x", fixed, out[1])
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}
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}
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@ -29,8 +29,11 @@ const (
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IntTy byte = iota
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UintTy
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BoolTy
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StringTy
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SliceTy
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AddressTy
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FixedBytesTy
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BytesTy
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HashTy
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RealTy
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)
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@ -118,6 +121,7 @@ func NewType(t string) (typ Type, err error) {
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typ.T = UintTy
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case "bool":
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typ.Kind = reflect.Bool
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typ.T = BoolTy
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case "real": // TODO
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typ.Kind = reflect.Invalid
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case "address":
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@ -128,6 +132,7 @@ func NewType(t string) (typ Type, err error) {
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case "string":
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typ.Kind = reflect.String
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typ.Size = -1
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typ.T = StringTy
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if vsize > 0 {
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typ.Size = 32
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}
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@ -140,6 +145,11 @@ func NewType(t string) (typ Type, err error) {
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||||
typ.Kind = reflect.Slice
|
||||
typ.Type = byte_ts
|
||||
typ.Size = vsize
|
||||
if vsize == 0 {
|
||||
typ.T = BytesTy
|
||||
} else {
|
||||
typ.T = FixedBytesTy
|
||||
}
|
||||
default:
|
||||
return Type{}, fmt.Errorf("unsupported arg type: %s", t)
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user