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serializer.go
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serializer.go
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// (c) 2019-2020, Ava Labs, Inc. All rights reserved.
// See the file LICENSE for licensing terms.
// Package state manages the meta-data required by consensus for an avalanche
// dag.
package state
import (
"errors"
"github.com/ava-labs/gecko/cache"
"github.com/ava-labs/gecko/database"
"github.com/ava-labs/gecko/database/versiondb"
"github.com/ava-labs/gecko/ids"
"github.com/ava-labs/gecko/snow"
"github.com/ava-labs/gecko/snow/choices"
"github.com/ava-labs/gecko/snow/consensus/snowstorm"
"github.com/ava-labs/gecko/utils/hashing"
"github.com/ava-labs/gecko/utils/math"
avacon "github.com/ava-labs/gecko/snow/consensus/avalanche"
avaeng "github.com/ava-labs/gecko/snow/engine/avalanche"
)
const (
dbCacheSize = 10000
idCacheSize = 1000
)
var (
errUnknownVertex = errors.New("unknown vertex")
errWrongChainID = errors.New("wrong ChainID in vertex")
)
// Serializer manages the state of multiple vertices
type Serializer struct {
ctx *snow.Context
vm avaeng.DAGVM
state *prefixedState
db *versiondb.Database
edge ids.Set
}
// Initialize implements the avalanche.State interface
func (s *Serializer) Initialize(ctx *snow.Context, vm avaeng.DAGVM, db database.Database) {
s.ctx = ctx
s.vm = vm
vdb := versiondb.New(db)
dbCache := &cache.LRU{Size: dbCacheSize}
rawState := &state{
serializer: s,
dbCache: dbCache,
db: vdb,
}
s.state = newPrefixedState(rawState, idCacheSize)
s.db = vdb
s.edge.Add(s.state.Edge()...)
}
// ParseVertex implements the avalanche.State interface
func (s *Serializer) ParseVertex(b []byte) (avacon.Vertex, error) {
vtx, err := s.parseVertex(b)
if err != nil {
return nil, err
}
if err := vtx.Verify(); err != nil {
return nil, err
}
uVtx := &uniqueVertex{
serializer: s,
vtxID: vtx.ID(),
}
if uVtx.Status() == choices.Unknown {
uVtx.setVertex(vtx)
}
s.db.Commit()
return uVtx, nil
}
// BuildVertex implements the avalanche.State interface
func (s *Serializer) BuildVertex(parentSet ids.Set, txs []snowstorm.Tx) (avacon.Vertex, error) {
parentIDs := parentSet.List()
ids.SortIDs(parentIDs)
sortTxs(txs)
height := uint64(0)
for _, parentID := range parentIDs {
parent, err := s.getVertex(parentID)
if err != nil {
return nil, err
}
height = math.Max64(height, parent.v.vtx.height)
}
vtx := &vertex{
chainID: s.ctx.ChainID,
height: height + 1,
parentIDs: parentIDs,
txs: txs,
}
bytes, err := vtx.Marshal()
if err != nil {
return nil, err
}
vtx.bytes = bytes
vtx.id = ids.NewID(hashing.ComputeHash256Array(vtx.bytes))
uVtx := &uniqueVertex{
serializer: s,
vtxID: vtx.ID(),
}
// It is possible this vertex already exists in the database, even though we
// just made it.
if uVtx.Status() == choices.Unknown {
uVtx.setVertex(vtx)
}
s.db.Commit()
return uVtx, nil
}
// GetVertex implements the avalanche.State interface
func (s *Serializer) GetVertex(vtxID ids.ID) (avacon.Vertex, error) { return s.getVertex(vtxID) }
// Edge implements the avalanche.State interface
func (s *Serializer) Edge() []ids.ID { return s.edge.List() }
func (s *Serializer) parseVertex(b []byte) (*vertex, error) {
vtx := &vertex{}
if err := vtx.Unmarshal(b, s.vm); err != nil {
return nil, err
} else if !vtx.chainID.Equals(s.ctx.ChainID) {
return nil, errWrongChainID
}
return vtx, nil
}
func (s *Serializer) getVertex(vtxID ids.ID) (*uniqueVertex, error) {
vtx := &uniqueVertex{
serializer: s,
vtxID: vtxID,
}
if vtx.Status() == choices.Unknown {
return nil, errUnknownVertex
}
return vtx, nil
}