mirror of https://github.com/poanetwork/gecko.git
145 lines
3.3 KiB
Go
145 lines
3.3 KiB
Go
// (c) 2019-2020, Ava Labs, Inc. All rights reserved.
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// See the file LICENSE for licensing terms.
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package avm
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import (
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"github.com/ava-labs/gecko/chains/atomic"
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"github.com/ava-labs/gecko/database"
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"github.com/ava-labs/gecko/database/versiondb"
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"github.com/ava-labs/gecko/snow"
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"github.com/ava-labs/gecko/vms/components/ava"
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"github.com/ava-labs/gecko/utils/codec"
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"github.com/ava-labs/gecko/vms/components/verify"
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)
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// ExportTx is the basis of all transactions.
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type ExportTx struct {
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BaseTx `serialize:"true"`
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Outs []*ava.TransferableOutput `serialize:"true" json:"exportedOutputs"` // The outputs this transaction is sending to the other chain
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}
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// SyntacticVerify that this transaction is well-formed.
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func (t *ExportTx) SyntacticVerify(ctx *snow.Context, c codec.Codec, _ int) error {
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switch {
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case t == nil:
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return errNilTx
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case t.NetID != ctx.NetworkID:
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return errWrongNetworkID
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case !t.BCID.Equals(ctx.ChainID):
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return errWrongChainID
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}
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fc := ava.NewFlowChecker()
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for _, out := range t.BaseTx.Outs {
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if err := out.Verify(); err != nil {
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return err
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}
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fc.Produce(out.AssetID(), out.Output().Amount())
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}
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if !ava.IsSortedTransferableOutputs(t.BaseTx.Outs, c) {
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return errOutputsNotSorted
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}
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for _, out := range t.Outs {
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if err := out.Verify(); err != nil {
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return err
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}
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fc.Produce(out.AssetID(), out.Output().Amount())
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}
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if !ava.IsSortedTransferableOutputs(t.Outs, c) {
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return errOutputsNotSorted
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}
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for _, in := range t.Ins {
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if err := in.Verify(); err != nil {
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return err
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}
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fc.Consume(in.AssetID(), in.Input().Amount())
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}
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if !ava.IsSortedAndUniqueTransferableInputs(t.Ins) {
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return errInputsNotSortedUnique
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}
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// TODO: Add the Tx fee to the produced side
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if err := fc.Verify(); err != nil {
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return err
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}
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return t.Metadata.Verify()
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}
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// SemanticVerify that this transaction is valid to be spent.
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func (t *ExportTx) SemanticVerify(vm *VM, uTx *UniqueTx, creds []verify.Verifiable) error {
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for i, in := range t.Ins {
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cred := creds[i]
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fxIndex, err := vm.getFx(cred)
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if err != nil {
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return err
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}
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fx := vm.fxs[fxIndex].Fx
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utxo, err := vm.getUTXO(&in.UTXOID)
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if err != nil {
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return err
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}
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utxoAssetID := utxo.AssetID()
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inAssetID := in.AssetID()
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if !utxoAssetID.Equals(inAssetID) {
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return errAssetIDMismatch
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}
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if !vm.verifyFxUsage(fxIndex, inAssetID) {
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return errIncompatibleFx
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}
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if err := fx.VerifyTransfer(uTx, in.In, cred, utxo.Out); err != nil {
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return err
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}
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}
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for _, out := range t.Outs {
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if !out.AssetID().Equals(vm.ava) {
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return errWrongAssetID
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}
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}
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return nil
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}
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// ExecuteWithSideEffects writes the batch with any additional side effects
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func (t *ExportTx) ExecuteWithSideEffects(vm *VM, batch database.Batch) error {
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txID := t.ID()
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smDB := vm.ctx.SharedMemory.GetDatabase(vm.platform)
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defer vm.ctx.SharedMemory.ReleaseDatabase(vm.platform)
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vsmDB := versiondb.New(smDB)
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state := ava.NewPrefixedState(vsmDB, vm.codec)
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for i, out := range t.Outs {
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utxo := &ava.UTXO{
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UTXOID: ava.UTXOID{
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TxID: txID,
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OutputIndex: uint32(len(t.BaseTx.Outs) + i),
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},
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Asset: ava.Asset{ID: out.AssetID()},
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Out: out.Out,
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}
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if err := state.FundAVMUTXO(utxo); err != nil {
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return err
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}
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}
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sharedBatch, err := vsmDB.CommitBatch()
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if err != nil {
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return err
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}
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return atomic.WriteAll(batch, sharedBatch)
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}
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