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esdtFreezeWipe.go
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/
esdtFreezeWipe.go
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package builtInFunctions
import (
"bytes"
"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 = (*esdtFreezeWipe)(nil)
type esdtFreezeWipe struct {
marshalizer marshal.Marshalizer
keyPrefix []byte
wipe bool
freeze bool
}
// NewESDTFreezeWipeFunc returns the esdt freeze/un-freeze/wipe built-in function component
func NewESDTFreezeWipeFunc(
marshalizer marshal.Marshalizer,
freeze bool,
wipe bool,
) (*esdtFreezeWipe, error) {
if check.IfNil(marshalizer) {
return nil, process.ErrNilMarshalizer
}
e := &esdtFreezeWipe{
marshalizer: marshalizer,
keyPrefix: []byte(core.ElrondProtectedKeyPrefix + core.ESDTKeyIdentifier),
freeze: freeze,
wipe: wipe,
}
return e, nil
}
// SetNewGasConfig is called whenever gas cost is changed
func (e *esdtFreezeWipe) SetNewGasConfig(_ *process.GasCost) {
}
// ProcessBuiltinFunction resolves ESDT transfer function call
func (e *esdtFreezeWipe) ProcessBuiltinFunction(
_, acntDst state.UserAccountHandler,
vmInput *vmcommon.ContractCallInput,
) (*vmcommon.VMOutput, error) {
if vmInput == nil {
return nil, process.ErrNilVmInput
}
if vmInput.CallValue.Cmp(zero) != 0 {
return nil, process.ErrBuiltInFunctionCalledWithValue
}
if len(vmInput.Arguments) != 1 {
return nil, process.ErrInvalidArguments
}
if !bytes.Equal(vmInput.CallerAddr, vm.ESDTSCAddress) {
return nil, process.ErrAddressIsNotESDTSystemSC
}
if check.IfNil(acntDst) {
return nil, process.ErrNilUserAccount
}
esdtTokenKey := append(e.keyPrefix, vmInput.Arguments[0]...)
log.Trace(vmInput.Function, "sender", vmInput.CallerAddr, "receiver", vmInput.RecipientAddr, "token", esdtTokenKey)
if e.wipe {
err := e.wipeIfApplicable(acntDst, esdtTokenKey)
if err != nil {
return nil, err
}
} else {
err := e.toggleFreeze(acntDst, esdtTokenKey)
if err != nil {
return nil, err
}
}
vmOutput := &vmcommon.VMOutput{ReturnCode: vmcommon.Ok}
return vmOutput, nil
}
func (e *esdtFreezeWipe) wipeIfApplicable(acntDst state.UserAccountHandler, tokenKey []byte) error {
tokenData, err := getESDTDataFromKey(acntDst, tokenKey, e.marshalizer)
if err != nil {
return err
}
esdtUserMetadata := ESDTUserMetadataFromBytes(tokenData.Properties)
if !esdtUserMetadata.Frozen {
return process.ErrCannotWipeAccountNotFrozen
}
return acntDst.DataTrieTracker().SaveKeyValue(tokenKey, nil)
}
func (e *esdtFreezeWipe) toggleFreeze(acntDst state.UserAccountHandler, tokenKey []byte) error {
tokenData, err := getESDTDataFromKey(acntDst, tokenKey, e.marshalizer)
if err != nil {
return err
}
esdtUserMetadata := ESDTUserMetadataFromBytes(tokenData.Properties)
esdtUserMetadata.Frozen = e.freeze
tokenData.Properties = esdtUserMetadata.ToBytes()
err = saveESDTData(acntDst, tokenData, tokenKey, e.marshalizer)
if err != nil {
return err
}
return nil
}
// IsInterfaceNil returns true if underlying object in nil
func (e *esdtFreezeWipe) IsInterfaceNil() bool {
return e == nil
}