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parser.go
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/
parser.go
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// Copyright (C) 2019-2023, Ava Labs, Inc. All rights reserved.
// See the file LICENSE for licensing terms.
package txs
import (
"fmt"
"math"
"reflect"
"github.com/ava-labs/avalanchego/codec"
"github.com/ava-labs/avalanchego/codec/linearcodec"
"github.com/ava-labs/avalanchego/codec/reflectcodec"
"github.com/ava-labs/avalanchego/utils"
"github.com/ava-labs/avalanchego/utils/logging"
"github.com/ava-labs/avalanchego/utils/timer/mockable"
"github.com/ava-labs/avalanchego/vms/avm/fxs"
)
// CodecVersion is the current default codec version
const CodecVersion = 0
var _ Parser = (*parser)(nil)
type Parser interface {
Codec() codec.Manager
GenesisCodec() codec.Manager
CodecRegistry() codec.Registry
GenesisCodecRegistry() codec.Registry
ParseTx(bytes []byte) (*Tx, error)
ParseGenesisTx(bytes []byte) (*Tx, error)
InitializeTx(tx *Tx) error
InitializeGenesisTx(tx *Tx) error
}
type parser struct {
cm codec.Manager
gcm codec.Manager
c linearcodec.Codec
gc linearcodec.Codec
}
func NewParser(fxs []fxs.Fx) (Parser, error) {
return NewCustomParser(
make(map[reflect.Type]int),
&mockable.Clock{},
logging.NoLog{},
fxs,
)
}
func NewCustomParser(
typeToFxIndex map[reflect.Type]int,
clock *mockable.Clock,
log logging.Logger,
fxs []fxs.Fx,
) (Parser, error) {
gc := linearcodec.New([]string{reflectcodec.DefaultTagName}, 1<<20)
c := linearcodec.NewDefault()
gcm := codec.NewManager(math.MaxInt32)
cm := codec.NewDefaultManager()
err := utils.Err(
c.RegisterType(&BaseTx{}),
c.RegisterType(&CreateAssetTx{}),
c.RegisterType(&OperationTx{}),
c.RegisterType(&ImportTx{}),
c.RegisterType(&ExportTx{}),
cm.RegisterCodec(CodecVersion, c),
gc.RegisterType(&BaseTx{}),
gc.RegisterType(&CreateAssetTx{}),
gc.RegisterType(&OperationTx{}),
gc.RegisterType(&ImportTx{}),
gc.RegisterType(&ExportTx{}),
gcm.RegisterCodec(CodecVersion, gc),
)
if err != nil {
return nil, err
}
vm := &fxVM{
typeToFxIndex: typeToFxIndex,
clock: clock,
log: log,
}
for i, fx := range fxs {
vm.codecRegistry = &codecRegistry{
codecs: []codec.Registry{gc, c},
index: i,
typeToIndex: vm.typeToFxIndex,
}
if err := fx.Initialize(vm); err != nil {
return nil, err
}
}
return &parser{
cm: cm,
gcm: gcm,
c: c,
gc: gc,
}, nil
}
func (p *parser) Codec() codec.Manager {
return p.cm
}
func (p *parser) GenesisCodec() codec.Manager {
return p.gcm
}
func (p *parser) CodecRegistry() codec.Registry {
return p.c
}
func (p *parser) GenesisCodecRegistry() codec.Registry {
return p.gc
}
func (p *parser) ParseTx(bytes []byte) (*Tx, error) {
return parse(p.cm, bytes)
}
func (p *parser) ParseGenesisTx(bytes []byte) (*Tx, error) {
return parse(p.gcm, bytes)
}
func (p *parser) InitializeTx(tx *Tx) error {
return initializeTx(p.cm, tx)
}
func (p *parser) InitializeGenesisTx(tx *Tx) error {
return initializeTx(p.gcm, tx)
}
func parse(cm codec.Manager, signedBytes []byte) (*Tx, error) {
tx := &Tx{}
parsedVersion, err := cm.Unmarshal(signedBytes, tx)
if err != nil {
return nil, err
}
if parsedVersion != CodecVersion {
return nil, fmt.Errorf("expected codec version %d but got %d", CodecVersion, parsedVersion)
}
unsignedBytesLen, err := cm.Size(CodecVersion, &tx.Unsigned)
if err != nil {
return nil, fmt.Errorf("couldn't calculate UnsignedTx marshal length: %w", err)
}
unsignedBytes := signedBytes[:unsignedBytesLen]
tx.SetBytes(unsignedBytes, signedBytes)
return tx, nil
}
func initializeTx(cm codec.Manager, tx *Tx) error {
signedBytes, err := cm.Marshal(CodecVersion, tx)
if err != nil {
return fmt.Errorf("problem creating transaction: %w", err)
}
unsignedBytesLen, err := cm.Size(CodecVersion, &tx.Unsigned)
if err != nil {
return fmt.Errorf("couldn't calculate UnsignedTx marshal length: %w", err)
}
unsignedBytes := signedBytes[:unsignedBytesLen]
tx.SetBytes(unsignedBytes, signedBytes)
return nil
}