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status.go
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status.go
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package dpos
import (
"sync"
"github.com/aergoio/aergo-lib/db"
"github.com/aergoio/aergo/consensus"
"github.com/aergoio/aergo/consensus/impl/dpos/bp"
"github.com/aergoio/aergo/state"
"github.com/aergoio/aergo/types"
)
var bsLoader *bootLoader
// Status manages DPoS-related infomations like LIB.
type Status struct {
sync.RWMutex
done bool
bestBlock *types.Block
libState *libStatus
bps *bp.Snapshots
}
// NewStatus returns a newly allocated Status.
func NewStatus(c bp.ClusterMember, cdb consensus.ChainDB, sdb *state.ChainStateDB, resetHeight types.BlockNo) *Status {
s := &Status{
libState: newLibStatus(consensusBlockCount(c.Size())),
bps: bp.NewSnapshots(c, cdb, sdb),
}
s.init(cdb, resetHeight)
return s
}
// load restores the last LIB status by using the informations loaded from the
// DB.
func (s *Status) load() {
if s.done {
return
}
s.bestBlock = bsLoader.bestBlock()
s.libState = bsLoader.ls
if bsLoader.ls != nil {
s.libState = bsLoader.ls
}
genesisBlock := bsLoader.genesisBlock()
s.libState.genesisInfo = &blockInfo{
BlockHash: genesisBlock.ID(),
BlockNo: genesisBlock.BlockNo(),
}
s.done = true
}
// Update updates the last irreversible block (LIB).
func (s *Status) Update(block *types.Block) {
s.Lock()
defer s.Unlock()
// TODO: move the lib status loading to dpos.NewStatus.
s.load()
curBestID := s.bestBlock.ID()
if curBestID == block.PrevID() {
s.libState.addConfirmInfo(block)
logger.Debug().
Str("block hash", block.ID()).
Uint64("block no", block.BlockNo()).
Msg("update LIB status")
// Block connected
if lib := s.libState.update(); lib != nil {
s.updateLIB(lib)
}
s.bps.AddSnapshot(block.BlockNo())
} else {
// Rollback resulting from a reorganization.
logger.Debug().
Str("block hash", block.ID()).
Uint64("target block no", block.BlockNo()).
Msg("rollback LIB status")
// Block reorganized. TODO: update consensus status, correctly.
if err := s.libState.rollbackStatusTo(block, s.libState.Lib); err != nil {
logger.Debug().Err(err).Msg("failed to rollback DPoS status")
panic(err)
}
// Rollback BP list. -- BP list is alos affected by a fork.
s.bps.UpdateCluster(block.BlockNo())
}
s.libState.gc()
s.bestBlock = block
}
func (s *Status) libBlockNo() types.BlockNo {
s.RLock()
defer s.RUnlock()
return s.libState.libNo()
}
func (s *Status) updateLIB(lib *blockInfo) {
s.libState.Lib = lib
logger.Debug().
Str("block hash", s.libState.Lib.BlockHash).
Uint64("block no", s.libState.Lib.BlockNo).
Int("confirms len", s.libState.confirms.Len()).
Msg("last irreversible block (BFT) updated")
}
// Save saves the consensus status information for the later recovery.
func (s *Status) Save(tx db.Transaction) error {
s.Lock()
defer s.Unlock()
if err := s.libState.save(tx); err != nil {
return err
}
return nil
}
// NeedReorganization reports whether reorganization is needed or not.
func (s *Status) NeedReorganization(rootNo types.BlockNo) bool {
s.RLock()
defer s.RUnlock()
if s.libState.Lib == nil {
logger.Debug().Uint64("branch root no", rootNo).Msg("no LIB")
return true
}
libNo := s.libState.Lib.BlockNo
reorganizable := rootNo >= libNo
if !reorganizable {
logger.Info().
Uint64("LIB", libNo).
Uint64("branch root no", rootNo).
Msg("reorganization beyond LIB is not allowed")
}
return reorganizable
}
// init recovers the last DPoS status including pre-LIB map and confirms
// list between LIB and the best block.
func (s *Status) init(cdb consensus.ChainDB, resetHeight types.BlockNo) {
if cdb == nil {
return
}
genesis, err := cdb.GetBlockByNo(0)
if err != nil {
panic(err)
}
best, err := cdb.GetBestBlock()
if err != nil {
best = genesis
}
bsLoader = &bootLoader{
ls: newLibStatus(s.libState.confirmsRequired),
best: best,
genesis: genesis,
cdb: cdb,
confirmsRequired: s.libState.confirmsRequired,
}
bsLoader.load(resetHeight)
}
type bootLoader struct {
ls *libStatus
best *types.Block
genesis *types.Block
cdb consensus.ChainDB
confirmsRequired uint16
}
func (bs *bootLoader) load(resetHeight types.BlockNo) {
if ls := bs.loadLibStatus(); ls != nil {
bs.ls = ls
logger.Debug().Int("proposed lib len", len(ls.Prpsd)).Msg("lib status loaded from DB")
for id, p := range ls.Prpsd {
if p == nil {
continue
}
// Remove the too high pre-LIBs when the ForceResetHeight parameter is set.
if resetHeight > 0 && (p.Plib.BlockNo > resetHeight || p.PlibBy.BlockNo > resetHeight) {
delete(ls.Prpsd, id)
}
logger.Debug().Str("BPID", id).
Str("confirmed hash", p.Plib.Hash()).
Str("confirmedBy hash", p.PlibBy.Hash()).
Msg("pre-LIB entry")
}
// Reset the LIB when the ForceResetHeight parameter is set.
if resetHeight > 0 && ls.Lib.BlockNo > resetHeight {
ls.Lib = &blockInfo{
BlockHash: bs.genesisBlock().ID(),
BlockNo: bs.genesisBlock().BlockNo(),
}
tx := bs.cdb.NewTx()
reset(tx)
tx.Commit()
}
}
}