mirror of https://github.com/poanetwork/gecko.git
172 lines
3.8 KiB
Go
172 lines
3.8 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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"errors"
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"github.com/ava-labs/gecko/ids"
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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/vms/components/codec"
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"github.com/ava-labs/gecko/vms/components/verify"
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)
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var (
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errOperationsNotSortedUnique = errors.New("operations not sorted and unique")
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errNoOperations = errors.New("an operationTx must have at least one operation")
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errDoubleSpend = errors.New("inputs attempt to double spend an input")
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)
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// OperationTx is a transaction with no credentials.
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type OperationTx struct {
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BaseTx `serialize:"true"`
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Ops []*Operation `serialize:"true"`
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}
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// Operations track which ops this transaction is performing. The returned array
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// should not be modified.
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func (t *OperationTx) Operations() []*Operation { return t.Ops }
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// InputUTXOs track which UTXOs this transaction is consuming.
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func (t *OperationTx) InputUTXOs() []*ava.UTXOID {
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utxos := t.BaseTx.InputUTXOs()
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for _, op := range t.Ops {
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for _, in := range op.Ins {
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utxos = append(utxos, &in.UTXOID)
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}
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}
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return utxos
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}
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// AssetIDs returns the IDs of the assets this transaction depends on
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func (t *OperationTx) AssetIDs() ids.Set {
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assets := t.BaseTx.AssetIDs()
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for _, op := range t.Ops {
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assets.Add(op.AssetID())
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}
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return assets
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}
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// UTXOs returns the UTXOs transaction is producing.
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func (t *OperationTx) UTXOs() []*ava.UTXO {
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txID := t.ID()
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utxos := t.BaseTx.UTXOs()
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for _, op := range t.Ops {
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asset := op.AssetID()
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for _, out := range op.Outs {
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utxos = append(utxos, &ava.UTXO{
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UTXOID: ava.UTXOID{
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TxID: txID,
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OutputIndex: uint32(len(utxos)),
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},
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Asset: ava.Asset{ID: asset},
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Out: out,
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})
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}
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}
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return utxos
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}
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// SyntacticVerify that this transaction is well-formed.
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func (t *OperationTx) SyntacticVerify(ctx *snow.Context, c codec.Codec, numFxs 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 len(t.Ops) == 0:
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return errNoOperations
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}
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if err := t.BaseTx.SyntacticVerify(ctx, c, numFxs); err != nil {
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return err
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}
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inputs := ids.Set{}
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for _, in := range t.Ins {
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inputs.Add(in.InputID())
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}
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for _, op := range t.Ops {
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if err := op.Verify(c); err != nil {
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return err
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}
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for _, in := range op.Ins {
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inputID := in.InputID()
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if inputs.Contains(inputID) {
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return errDoubleSpend
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}
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inputs.Add(inputID)
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}
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}
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if !isSortedAndUniqueOperations(t.Ops, c) {
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return errOperationsNotSortedUnique
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}
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return nil
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}
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// SemanticVerify that this transaction is well-formed.
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func (t *OperationTx) SemanticVerify(vm *VM, uTx *UniqueTx, creds []verify.Verifiable) error {
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if err := t.BaseTx.SemanticVerify(vm, uTx, creds); err != nil {
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return err
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}
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offset := len(t.BaseTx.Ins)
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for _, op := range t.Ops {
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opAssetID := op.AssetID()
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utxos := []interface{}{}
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ins := []interface{}{}
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credIntfs := []interface{}{}
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outs := []interface{}{}
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for i, in := range op.Ins {
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ins = append(ins, in.In)
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cred := creds[i+offset]
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credIntfs = append(credIntfs, cred)
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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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if !utxoAssetID.Equals(opAssetID) {
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return errAssetIDMismatch
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}
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utxos = append(utxos, utxo.Out)
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}
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offset += len(op.Ins)
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for _, out := range op.Outs {
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outs = append(outs, out)
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}
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var fxObj interface{}
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switch {
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case len(ins) > 0:
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fxObj = ins[0]
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case len(outs) > 0:
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fxObj = outs[0]
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}
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fxIndex, err := vm.getFx(fxObj)
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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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if !vm.verifyFxUsage(fxIndex, opAssetID) {
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return errIncompatibleFx
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}
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err = fx.VerifyOperation(uTx, utxos, ins, credIntfs, outs)
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if err != nil {
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return err
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}
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}
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return nil
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}
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