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base_tx.go
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base_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/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 (
errNilTx = errors.New("nil tx is not valid")
_ UnsignedTx = &BaseTx{}
)
// BaseTx is the basis of all transactions.
type BaseTx struct {
avax.BaseTx `serialize:"true"`
}
// Init sets the FxID fields in the inputs and outputs of this [BaseTx]
// Also sets the [ctx] in the OutputOwners to the given [vm.ctx] so that the
// addresses can be json marshalled into human readable format
func (t *BaseTx) Init(vm *VM) error {
for _, in := range t.Ins {
fx, err := vm.getParsedFx(in.In)
if err != nil {
return err
}
in.FxID = fx.ID
}
for _, out := range t.Outs {
fx, err := vm.getParsedFx(out.Out)
if err != nil {
return err
}
out.FxID = fx.ID
out.InitCtx(vm.ctx)
}
return nil
}
// SyntacticVerify that this transaction is well-formed.
func (t *BaseTx) SyntacticVerify(
ctx *snow.Context,
c codec.Manager,
txFeeAssetID ids.ID,
txFee uint64,
_ uint64,
_ int,
) error {
if t == nil {
return errNilTx
}
if err := t.MetadataVerify(ctx); err != nil {
return err
}
return avax.VerifyTx(
txFee,
txFeeAssetID,
[][]*avax.TransferableInput{t.Ins},
[][]*avax.TransferableOutput{t.Outs},
c,
)
}
// SemanticVerify that this transaction is valid to be spent.
func (t *BaseTx) SemanticVerify(vm *VM, tx UnsignedTx, creds []verify.Verifiable) error {
for i, in := range t.Ins {
cred := creds[i]
if err := vm.verifyTransfer(tx, in, cred); err != nil {
return err
}
}
for _, out := range t.Outs {
fxIndex, err := vm.getFx(out.Out)
if err != nil {
return err
}
if assetID := out.AssetID(); !vm.verifyFxUsage(fxIndex, assetID) {
return errIncompatibleFx
}
}
return nil
}
// ExecuteWithSideEffects writes the batch with any additional side effects
func (t *BaseTx) ExecuteWithSideEffects(_ *VM, batch database.Batch) error { return batch.Write() }