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parser.go
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parser.go
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// Copyright (C) 2019-2021, 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/logging"
"github.com/ava-labs/avalanchego/utils/timer/mockable"
"github.com/ava-labs/avalanchego/utils/wrappers"
"github.com/ava-labs/avalanchego/vms/avm/fxs"
)
const CodecVersion = 0
var _ Parser = &parser{}
type Parser interface {
Codec() codec.Manager
GenesisCodec() codec.Manager
Parse(bytes []byte) (*Tx, error)
ParseGenesis(bytes []byte) (*Tx, error)
InitializeTx(tx *Tx) error
InitializeGenesisTx(tx *Tx) error
}
type parser struct {
cm codec.Manager
gcm codec.Manager
}
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()
errs := wrappers.Errs{}
errs.Add(
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 errs.Errored() {
return nil, errs.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,
}, nil
}
func (p *parser) Codec() codec.Manager { return p.cm }
func (p *parser) GenesisCodec() codec.Manager { return p.gcm }
func (p *parser) Parse(bytes []byte) (*Tx, error) { return parse(p.cm, bytes) }
func (p *parser) ParseGenesis(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, bytes []byte) (*Tx, error) {
tx := &Tx{}
parsedVersion, err := cm.Unmarshal(bytes, tx)
if err != nil {
return nil, err
}
if parsedVersion != CodecVersion {
return nil, fmt.Errorf("expected codec version %d but got %d", CodecVersion, parsedVersion)
}
unsignedBytes, err := cm.Marshal(CodecVersion, &tx.Unsigned)
if err != nil {
return nil, err
}
tx.Initialize(unsignedBytes, bytes)
return tx, nil
}
func initializeTx(cm codec.Manager, tx *Tx) error {
unsignedBytes, err := cm.Marshal(CodecVersion, tx.Unsigned)
if err != nil {
return err
}
signedBytes, err := cm.Marshal(CodecVersion, &tx)
if err != nil {
return err
}
tx.Initialize(unsignedBytes, signedBytes)
return nil
}