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https://github.com/nspcc-dev/neo-go.git
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native: don't recalculate validators every block
Recalculate them once per epoch. Consensus is aware of it and must call CalculateNextValidators exactly when needed. Signed-off-by: Anna Shaleva <shaleva.ann@nspcc.ru>
This commit is contained in:
Anna Shaleva
parent
07e1bc7cd7
commit
312534af7c
2 changed files with 63 additions and 31 deletions
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@ -677,9 +677,22 @@ func (s *service) getValidators(txes ...block.Transaction) []crypto.PublicKey {
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err error
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)
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if txes == nil {
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// getValidators with empty args is used by dbft to fill the list of
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// block's validators, thus should return validators from the current
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// epoch without recalculation.
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pKeys, err = s.Chain.GetNextBlockValidators()
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} else {
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pKeys = s.Chain.ComputeNextBlockValidators()
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// getValidators with non-empty args is used by dbft to fill block's
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// NextConsensus field, thus should return proper value for NextConsensus.
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cfg := s.Chain.GetConfig().ProtocolConfiguration
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if cfg.ShouldUpdateCommitteeAt(s.dbft.Context.BlockIndex) {
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// Calculate NextConsensus based on the most fresh chain state.
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pKeys = s.Chain.ComputeNextBlockValidators()
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} else {
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// Take the cached validators that are relevant for the current dBFT epoch
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// to make NextConsensus.
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pKeys, err = s.Chain.GetNextBlockValidators()
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}
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}
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if err != nil {
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s.log.Error("error while trying to get validators", zap.Error(err))
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@ -725,8 +738,11 @@ func (s *service) newBlockFromContext(ctx *dbft.Context) block.Block {
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var err error
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cfg := s.Chain.GetConfig().ProtocolConfiguration
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if cfg.ShouldUpdateCommitteeAt(ctx.BlockIndex) {
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// Calculate NextConsensus based on the most fresh chain state.
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validators = s.Chain.ComputeNextBlockValidators()
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} else {
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// Take the cached validators that are relevant for the current dBFT epoch
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// to make NextConsensus.
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validators, err = s.Chain.GetNextBlockValidators()
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}
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if err != nil {
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@ -50,11 +50,13 @@ type NeoCache struct {
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votesChanged bool
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nextValidators keys.PublicKeys
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// validators contains cached next block validators. This list is updated every
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// PostPersist if candidates votes ratio has been changed or register/unregister
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// operation was performed within the persisted block. The updated value is
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// being persisted following the standard layered DAO persist rules, so that
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// external users will always get the proper value with upper Blockchain's DAO.
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// validators contains cached next block validators. This list is updated once
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// per dBFT epoch in PostPersist of the last block in the epoch if candidates
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// votes ratio has been changed or register/unregister operation was performed
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// within the last processed epoch. The updated value is being persisted
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// following the standard layered DAO persist rules, so that external users
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// will get the proper value with upper Blockchain's DAO (but this value is
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// relevant only by the moment of first epoch block creation).
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validators keys.PublicKeys
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// committee contains cached committee members and their votes.
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// It is updated once in a while depending on committee size
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@ -274,7 +276,7 @@ func (n *NEO) Initialize(ic *interop.Context) error {
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cache := &NeoCache{
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gasPerVoteCache: make(map[string]big.Int),
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votesChanged: true,
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validators: nil, // will be updated in genesis PostPersist.
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validators: nil, // will be updated in the last epoch block's PostPersist right before the committee update block.
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}
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// We need cache to be present in DAO before the subsequent call to `mint`.
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@ -317,6 +319,11 @@ func (n *NEO) InitializeCache(blockHeight uint32, d *dao.Simple) error {
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cache := &NeoCache{
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gasPerVoteCache: make(map[string]big.Int),
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votesChanged: true,
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// If it's a block in the middle of dbft epoch, then no one must access
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// this field, and it will be updated during the PostPersist of the last
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// block in the current epoch. If it's the laast block of the current epoch,
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// then update this cache manually below.
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validators: nil,
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}
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var committee = keysWithVotes{}
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@ -331,10 +338,14 @@ func (n *NEO) InitializeCache(blockHeight uint32, d *dao.Simple) error {
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cache.gasPerBlock = n.getSortedGASRecordFromDAO(d)
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cache.registerPrice = getIntWithKey(n.ID, d, []byte{prefixRegisterPrice})
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numOfCNs := n.cfg.GetNumOfCNs(blockHeight + 1)
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err := n.updateCachedValidators(d, cache, blockHeight, numOfCNs)
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if err != nil {
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return fmt.Errorf("failed to update next block validators cache: %w", err)
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// Update next block validators cache for external users if committee should be
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// updated in the next block.
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if n.cfg.ShouldUpdateCommitteeAt(blockHeight + 1) {
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var numOfCNs = n.cfg.GetNumOfCNs(blockHeight + 1)
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err := n.updateCachedValidators(d, cache, blockHeight, numOfCNs)
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if err != nil {
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return fmt.Errorf("failed to update next block validators cache: %w", err)
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}
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}
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d.SetCache(n.ID, cache)
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@ -366,8 +377,9 @@ func (n *NEO) updateCache(cache *NeoCache, cvs keysWithVotes, blockHeight uint32
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}
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// updateCachedValidators sets validators cache that will be used by external users
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// to retrieve next block validators list. Thus, it stores the list of validators
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// computed using the currently persisted block state.
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// to retrieve next block validators list of the next dBFT epoch that wasn't yet
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// started. Thus, it stores the list of validators computed using the persisted
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// blocks state of the latest epoch.
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func (n *NEO) updateCachedValidators(d *dao.Simple, cache *NeoCache, blockHeight uint32, numOfCNs int) error {
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result, _, err := n.computeCommitteeMembers(blockHeight, d)
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if err != nil {
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@ -463,18 +475,21 @@ func (n *NEO) PostPersist(ic *interop.Context) error {
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}
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}
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}
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// Update next block validators cache for external users.
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var (
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h = ic.Block.Index // consider persisting block as stored to get _next_ block validators
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numOfCNs = n.cfg.GetNumOfCNs(h + 1)
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)
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if cache.validators == nil || numOfCNs != len(cache.validators) {
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if !isCacheRW {
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cache = ic.DAO.GetRWCache(n.ID).(*NeoCache)
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}
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err := n.updateCachedValidators(ic.DAO, cache, h, numOfCNs)
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if err != nil {
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return fmt.Errorf("failed to update next block validators cache: %w", err)
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// Update next block validators cache for external users if committee should be
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// updated in the next block.
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if n.cfg.ShouldUpdateCommitteeAt(ic.Block.Index + 1) {
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var (
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h = ic.Block.Index // consider persisting block as stored to get _next_ block validators
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numOfCNs = n.cfg.GetNumOfCNs(h + 1)
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)
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if cache.validators == nil || numOfCNs != len(cache.validators) {
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if !isCacheRW {
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cache = ic.DAO.GetRWCache(n.ID).(*NeoCache)
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}
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err := n.updateCachedValidators(ic.DAO, cache, h, numOfCNs)
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if err != nil {
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return fmt.Errorf("failed to update next block validators cache: %w", err)
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}
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}
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}
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@ -1084,11 +1099,11 @@ func (n *NEO) getAccountState(ic *interop.Context, args []stackitem.Item) stacki
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}
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// ComputeNextBlockValidators computes an actual list of current validators that is
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// relevant for the latest persisted block and based on the latest changes made by
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// register/unregister/vote calls.
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// relevant for the latest processed dBFT epoch and based on the changes made by
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// register/unregister/vote calls during the latest epoch.
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// Note: this method isn't actually "computes" new committee list and calculates
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// new validators list from it. Instead, it uses cache, but the cache itself is
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// updated every block.
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// new validators list from it. Instead, it uses cache, and the cache itself is
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// updated during the PostPersist of the last block of every epoch.
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func (n *NEO) ComputeNextBlockValidators(d *dao.Simple) keys.PublicKeys {
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// It should always be OK with RO cache if using lower-layered DAO with proper
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// cache set.
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@ -1096,8 +1111,9 @@ func (n *NEO) ComputeNextBlockValidators(d *dao.Simple) keys.PublicKeys {
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if vals := cache.validators; vals != nil {
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return vals.Copy()
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}
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// It's a program error not to have the right value in lower cache.
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panic(fmt.Errorf("unexpected validators cache content: %v", cache.validators))
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// It's a caller's program error to call ComputeNextBlockValidators not having
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// the right value in lower cache.
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panic("bug: unexpected external call to validators cache")
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}
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func (n *NEO) getCommittee(ic *interop.Context, _ []stackitem.Item) stackitem.Item {
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