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import_tx.go
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import_tx.go
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// (c) 2019-2020, Ava Labs, Inc. All rights reserved.
// See the file LICENSE for licensing terms.
package avm
import (
"errors"
"github.com/ava-labs/avalanchego/chains/atomic"
"github.com/ava-labs/avalanchego/codec"
"github.com/ava-labs/avalanchego/database"
"github.com/ava-labs/avalanchego/ids"
"github.com/ava-labs/avalanchego/snow"
"github.com/ava-labs/avalanchego/vms/components/avax"
"github.com/ava-labs/avalanchego/vms/components/verify"
)
var (
errNoImportInputs = errors.New("no import inputs")
_ UnsignedTx = &ImportTx{}
)
// ImportTx is a transaction that imports an asset from another blockchain.
type ImportTx struct {
BaseTx `serialize:"true"`
// Which chain to consume the funds from
SourceChain ids.ID `serialize:"true" json:"sourceChain"`
// The inputs to this transaction
ImportedIns []*avax.TransferableInput `serialize:"true" json:"importedInputs"`
}
func (t *ImportTx) Init(vm *VM) error {
for _, in := range t.ImportedIns {
fx, err := vm.getParsedFx(in.In)
if err != nil {
return err
}
in.FxID = fx.ID
}
return t.BaseTx.Init(vm)
}
// InputUTXOs track which UTXOs this transaction is consuming.
func (t *ImportTx) InputUTXOs() []*avax.UTXOID {
utxos := t.BaseTx.InputUTXOs()
for _, in := range t.ImportedIns {
in.Symbol = true
utxos = append(utxos, &in.UTXOID)
}
return utxos
}
// ConsumedAssetIDs returns the IDs of the assets this transaction consumes
func (t *ImportTx) ConsumedAssetIDs() ids.Set {
assets := t.BaseTx.AssetIDs()
for _, in := range t.ImportedIns {
assets.Add(in.AssetID())
}
return assets
}
// AssetIDs returns the IDs of the assets this transaction depends on
func (t *ImportTx) AssetIDs() ids.Set {
assets := t.BaseTx.AssetIDs()
for _, in := range t.ImportedIns {
assets.Add(in.AssetID())
}
return assets
}
// NumCredentials returns the number of expected credentials
func (t *ImportTx) NumCredentials() int { return t.BaseTx.NumCredentials() + len(t.ImportedIns) }
// SyntacticVerify that this transaction is well-formed.
func (t *ImportTx) SyntacticVerify(
ctx *snow.Context,
c codec.Manager,
txFeeAssetID ids.ID,
txFee uint64,
_ uint64,
numFxs int,
) error {
switch {
case t == nil:
return errNilTx
case len(t.ImportedIns) == 0:
return errNoImportInputs
}
if err := t.MetadataVerify(ctx); err != nil {
return err
}
return avax.VerifyTx(
txFee,
txFeeAssetID,
[][]*avax.TransferableInput{
t.Ins,
t.ImportedIns,
},
[][]*avax.TransferableOutput{t.Outs},
c,
)
}
// SemanticVerify that this transaction is well-formed.
func (t *ImportTx) SemanticVerify(vm *VM, tx UnsignedTx, creds []verify.Verifiable) error {
if err := t.BaseTx.SemanticVerify(vm, tx, creds); err != nil {
return err
}
if !vm.bootstrapped {
return nil
}
subnetID, err := vm.ctx.SNLookup.SubnetID(t.SourceChain)
if err != nil {
return err
}
if vm.ctx.SubnetID != subnetID || t.SourceChain == vm.ctx.ChainID {
return errWrongBlockchainID
}
utxoIDs := make([][]byte, len(t.ImportedIns))
for i, in := range t.ImportedIns {
inputID := in.UTXOID.InputID()
utxoIDs[i] = inputID[:]
}
allUTXOBytes, err := vm.ctx.SharedMemory.Get(t.SourceChain, utxoIDs)
if err != nil {
return err
}
offset := t.BaseTx.NumCredentials()
for i, in := range t.ImportedIns {
utxo := avax.UTXO{}
if _, err := vm.codec.Unmarshal(allUTXOBytes[i], &utxo); err != nil {
return err
}
cred := creds[i+offset]
if err := vm.verifyTransferOfUTXO(tx, in, cred, &utxo); err != nil {
return err
}
}
return nil
}
// ExecuteWithSideEffects writes the batch with any additional side effects
func (t *ImportTx) ExecuteWithSideEffects(vm *VM, batch database.Batch) error {
utxoIDs := make([][]byte, len(t.ImportedIns))
for i, in := range t.ImportedIns {
inputID := in.UTXOID.InputID()
utxoIDs[i] = inputID[:]
}
return vm.ctx.SharedMemory.Apply(map[ids.ID]*atomic.Requests{t.SourceChain: {RemoveRequests: utxoIDs}}, batch)
}