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esdtBurn.go
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/
esdtBurn.go
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package builtInFunctions
import (
"bytes"
"math/big"
"sync"
"github.com/ElrondNetwork/elrond-go/core"
"github.com/ElrondNetwork/elrond-go/core/check"
"github.com/ElrondNetwork/elrond-go/core/vmcommon"
"github.com/ElrondNetwork/elrond-go/data/state"
"github.com/ElrondNetwork/elrond-go/marshal"
"github.com/ElrondNetwork/elrond-go/process"
"github.com/ElrondNetwork/elrond-go/vm"
)
var _ process.BuiltinFunction = (*esdtBurn)(nil)
type esdtBurn struct {
funcGasCost uint64
marshalizer marshal.Marshalizer
keyPrefix []byte
pauseHandler process.ESDTPauseHandler
mutExecution sync.RWMutex
}
// NewESDTBurnFunc returns the esdt burn built-in function component
func NewESDTBurnFunc(
funcGasCost uint64,
marshalizer marshal.Marshalizer,
pauseHandler process.ESDTPauseHandler,
) (*esdtBurn, error) {
if check.IfNil(marshalizer) {
return nil, process.ErrNilMarshalizer
}
if check.IfNil(pauseHandler) {
return nil, process.ErrNilPauseHandler
}
e := &esdtBurn{
funcGasCost: funcGasCost,
marshalizer: marshalizer,
keyPrefix: []byte(core.ElrondProtectedKeyPrefix + core.ESDTKeyIdentifier),
pauseHandler: pauseHandler,
}
return e, nil
}
// SetNewGasConfig is called whenever gas cost is changed
func (e *esdtBurn) SetNewGasConfig(gasCost *process.GasCost) {
e.mutExecution.Lock()
e.funcGasCost = gasCost.BuiltInCost.ESDTBurn
e.mutExecution.Unlock()
}
// ProcessBuiltinFunction resolves ESDT burn function call
func (e *esdtBurn) ProcessBuiltinFunction(
acntSnd, _ state.UserAccountHandler,
vmInput *vmcommon.ContractCallInput,
) (*vmcommon.VMOutput, error) {
e.mutExecution.RLock()
defer e.mutExecution.RUnlock()
if vmInput == nil {
return nil, process.ErrNilVmInput
}
if vmInput.CallValue.Cmp(zero) != 0 {
return nil, process.ErrBuiltInFunctionCalledWithValue
}
if len(vmInput.Arguments) != 2 {
return nil, process.ErrInvalidArguments
}
value := big.NewInt(0).SetBytes(vmInput.Arguments[1])
if value.Cmp(zero) <= 0 {
return nil, process.ErrNegativeValue
}
if !bytes.Equal(vmInput.RecipientAddr, vm.ESDTSCAddress) {
return nil, process.ErrAddressIsNotESDTSystemSC
}
if check.IfNil(acntSnd) {
return nil, process.ErrNilUserAccount
}
esdtTokenKey := append(e.keyPrefix, vmInput.Arguments[0]...)
log.Trace("esdtBurn", "sender", vmInput.CallerAddr, "receiver", vmInput.RecipientAddr, "value", value, "token", esdtTokenKey)
if vmInput.GasProvided < e.funcGasCost {
return nil, process.ErrNotEnoughGas
}
err := addToESDTBalance(vmInput.CallerAddr, acntSnd, esdtTokenKey, big.NewInt(0).Neg(value), e.marshalizer, e.pauseHandler)
if err != nil {
return nil, err
}
gasRemaining := computeGasRemaining(acntSnd, vmInput.GasProvided, e.funcGasCost)
vmOutput := &vmcommon.VMOutput{GasRemaining: gasRemaining, ReturnCode: vmcommon.Ok}
if core.IsSmartContractAddress(vmInput.CallerAddr) {
addOutPutTransferToVMOutput(
core.BuiltInFunctionESDTBurn,
vmInput.Arguments,
vmInput.RecipientAddr,
vmInput.GasLocked,
vmOutput)
}
return vmOutput, nil
}
// IsInterfaceNil returns true if underlying object in nil
func (e *esdtBurn) IsInterfaceNil() bool {
return e == nil
}