/
managedConversions.go
219 lines (185 loc) · 5.48 KB
/
managedConversions.go
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package elrondapi
import (
"encoding/binary"
"errors"
"math/big"
"github.com/ElrondNetwork/wasm-vm/arwen"
"github.com/ElrondNetwork/wasm-vm/math"
"github.com/ElrondNetwork/elrond-go-core/core"
vmcommon "github.com/ElrondNetwork/elrond-vm-common"
)
const esdtTransferLen = 16
// Deserializes a vmcommon.ESDTTransfer object.
func readESDTTransfer(
managedType arwen.ManagedTypesContext,
data []byte,
) (*vmcommon.ESDTTransfer, error) {
if len(data) != esdtTransferLen {
return nil, errors.New("invalid ESDT transfer object encoding")
}
tokenIdentifierHandle := int32(binary.BigEndian.Uint32(data[0:4]))
tokenIdentifier, err := managedType.GetBytes(tokenIdentifierHandle)
if err != nil {
return nil, err
}
managedType.ConsumeGasForBytes(tokenIdentifier)
nonce := binary.BigEndian.Uint64(data[4:12])
valueHandle := int32(binary.BigEndian.Uint32(data[12:16]))
value, err := managedType.GetBigInt(valueHandle)
if err != nil {
return nil, err
}
managedType.ConsumeGasForBigIntCopy(value)
tokenType := core.Fungible
if nonce > 0 {
tokenType = core.NonFungible
}
return &vmcommon.ESDTTransfer{
ESDTTokenName: tokenIdentifier,
ESDTTokenType: uint32(tokenType),
ESDTTokenNonce: nonce,
ESDTValue: value,
}, nil
}
// Converts a managed buffer of serialized data to a slice of ESDTTransfer.
// The format is:
// - token identifier handle - 4 bytes
// - nonce - 8 bytes
// - value handle - 4 bytes
// Total: 16 bytes.
func readESDTTransfers(
managedType arwen.ManagedTypesContext,
managedVecHandle int32,
) ([]*vmcommon.ESDTTransfer, error) {
managedVecBytes, err := managedType.GetBytes(managedVecHandle)
if err != nil {
return nil, err
}
managedType.ConsumeGasForBytes(managedVecBytes)
if len(managedVecBytes)%esdtTransferLen != 0 {
return nil, errors.New("invalid managed vector of ESDT transfers")
}
numTransfers := len(managedVecBytes) / esdtTransferLen
result := make([]*vmcommon.ESDTTransfer, 0, numTransfers)
for i := 0; i < len(managedVecBytes); i += esdtTransferLen {
esdtTransfer, err := readESDTTransfer(managedType, managedVecBytes[i:i+esdtTransferLen])
if err != nil {
return nil, err
}
result = append(result, esdtTransfer)
}
return result, nil
}
// Serializes a vmcommon.ESDTTransfer object.
func writeESDTTransfer(
managedType arwen.ManagedTypesContext,
esdtTransfer *vmcommon.ESDTTransfer,
destinationBytes []byte,
) {
tokenIdentifierHandle := managedType.NewManagedBufferFromBytes(esdtTransfer.ESDTTokenName)
valueHandle := managedType.NewBigInt(esdtTransfer.ESDTValue)
binary.BigEndian.PutUint32(destinationBytes[0:4], uint32(tokenIdentifierHandle))
binary.BigEndian.PutUint64(destinationBytes[4:12], esdtTransfer.ESDTTokenNonce)
binary.BigEndian.PutUint32(destinationBytes[12:16], uint32(valueHandle))
}
// Serializes a list of ESDTTransfer one after the other into a byte slice.
// The format is (for each ESDTTransfer):
// - token identifier handle - 4 bytes
// - nonce - 8 bytes
// - value handle - 4 bytes
// Total: 16 bytes.
func writeESDTTransfersToBytes(
managedType arwen.ManagedTypesContext,
esdtTransfers []*vmcommon.ESDTTransfer,
) []byte {
destinationBytes := make([]byte, esdtTransferLen*len(esdtTransfers))
dataIndex := 0
for _, esdtTransfer := range esdtTransfers {
writeESDTTransfer(managedType, esdtTransfer, destinationBytes[dataIndex:dataIndex+esdtTransferLen])
dataIndex += esdtTransferLen
}
return destinationBytes
}
type vmInputData struct {
destination []byte
function string
value *big.Int
arguments [][]byte
}
func readDestinationValueFunctionArguments(
host arwen.VMHost,
destHandle int32,
valueHandle int32,
functionHandle int32,
argumentsHandle int32,
) (*vmInputData, error) {
managedType := host.ManagedTypes()
vmInput, err := readDestinationValueArguments(host, destHandle, valueHandle, argumentsHandle)
if err != nil {
return nil, err
}
function, err := managedType.GetBytes(functionHandle)
if err != nil {
return nil, err
}
vmInput.function = string(function)
return vmInput, err
}
func readDestinationValueArguments(
host arwen.VMHost,
destHandle int32,
valueHandle int32,
argumentsHandle int32,
) (*vmInputData, error) {
managedType := host.ManagedTypes()
vmInput, err := readDestinationArguments(host, destHandle, argumentsHandle)
if err != nil {
return nil, err
}
vmInput.value, err = managedType.GetBigInt(valueHandle)
if err != nil {
return nil, err
}
return vmInput, err
}
func readDestinationFunctionArguments(
host arwen.VMHost,
destHandle int32,
functionHandle int32,
argumentsHandle int32,
) (*vmInputData, error) {
managedType := host.ManagedTypes()
vmInput, err := readDestinationArguments(host, destHandle, argumentsHandle)
if err != nil {
return nil, err
}
function, err := managedType.GetBytes(functionHandle)
if err != nil {
return nil, err
}
vmInput.function = string(function)
return vmInput, err
}
func readDestinationArguments(
host arwen.VMHost,
destHandle int32,
argumentsHandle int32,
) (*vmInputData, error) {
managedType := host.ManagedTypes()
metering := host.Metering()
var err error
vmInput := &vmInputData{}
vmInput.destination, err = managedType.GetBytes(destHandle)
if err != nil {
return nil, err
}
vmInput.value = big.NewInt(0)
data, actualLen, err := managedType.ReadManagedVecOfManagedBuffers(argumentsHandle)
if err != nil {
return nil, err
}
vmInput.arguments = data
gasToUse := math.MulUint64(metering.GasSchedule().BaseOperationCost.DataCopyPerByte, actualLen)
metering.UseAndTraceGas(gasToUse)
return vmInput, err
}