consensus

package
v0.7.4 Latest Latest
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 Go to latest Published: Dec 14, 2016 License: Apache-2.0 Imports: 21 Imported by: 0

README

The core consensus algorithm.

  • state.go - The state machine as detailed in the whitepaper
  • reactor.go - A reactor that connects the state machine to the gossip network

Go-routine summary

The reactor runs 2 go-routines for each added peer: gossipDataRoutine and gossipVotesRoutine.

The consensus state runs two persistent go-routines: timeoutRoutine and receiveRoutine. Go-routines are also started to trigger timeouts and to avoid blocking when the internalMsgQueue is really backed up.

Replay/WAL

A write-ahead log is used to record all messages processed by the receiveRoutine, which amounts to all inputs to the consensus state machine: messages from peers, messages from ourselves, and timeouts. They can be played back deterministically at startup or using the replay console.

Documentation

Index

Constants

View Source 
const (
	StateChannel = byte(0x20)
	DataChannel  = byte(0x21)
	VoteChannel  = byte(0x22)
)
View Source 
const (
	RoundStepNewHeight     = RoundStepType(0x01) // Wait til CommitTime + timeoutCommit
	RoundStepNewRound      = RoundStepType(0x02) // Setup new round and go to RoundStepPropose
	RoundStepPropose       = RoundStepType(0x03) // Did propose, gossip proposal
	RoundStepPrevote       = RoundStepType(0x04) // Did prevote, gossip prevotes
	RoundStepPrevoteWait   = RoundStepType(0x05) // Did receive any +2/3 prevotes, start timeout
	RoundStepPrecommit     = RoundStepType(0x06) // Did precommit, gossip precommits
	RoundStepPrecommitWait = RoundStepType(0x07) // Did receive any +2/3 precommits, start timeout
	RoundStepCommit        = RoundStepType(0x08) // Entered commit state machine

)

Variables

View Source 
var (
	ErrPeerStateHeightRegression = errors.New("Error peer state height regression")
	ErrPeerStateInvalidStartTime = errors.New("Error peer state invalid startTime")
)
View Source 
var (
	ErrInvalidProposalSignature = errors.New("Error invalid proposal signature")
	ErrInvalidProposalPOLRound  = errors.New("Error invalid proposal POL round")
	ErrAddingVote               = errors.New("Error adding vote")
	ErrVoteHeightMismatch       = errors.New("Error vote height mismatch")
)
View Source 
var Major = "0" //
View Source 
var Minor = "2" // replay refactor
View Source 
var Revision = "2" // validation -> commit
View Source 
var Spec = "1" // async

kind of arbitrary

View Source 
var Version = Fmt("v%s/%s.%s.%s", Spec, Major, Minor, Revision)

Functions

func CompareHRS 

func CompareHRS(h1, r1 int, s1 RoundStepType, h2, r2 int, s2 RoundStepType) int

Types

type BlockPartMessage 

type BlockPartMessage struct {
	Height int
	Round  int
	Part   *types.Part
}

func (*BlockPartMessage) String 

func (m *BlockPartMessage) String() string

type CommitStepMessage 

type CommitStepMessage struct {
	Height           int
	BlockPartsHeader types.PartSetHeader
	BlockParts       *BitArray
}

func (*CommitStepMessage) String 

func (m *CommitStepMessage) String() string

type ConsensusLogMessage 

type ConsensusLogMessage struct {
	Time time.Time                    `json:"time"`
	Msg  ConsensusLogMessageInterface `json:"msg"`
}

type ConsensusLogMessageInterface 

type ConsensusLogMessageInterface interface{}

type ConsensusMessage 

type ConsensusMessage interface{}

func DecodeMessage 

func DecodeMessage(bz []byte) (msgType byte, msg ConsensusMessage, err error)

TODO: check for unnecessary extra bytes at the end.

type ConsensusReactor 

type ConsensusReactor struct {
	p2p.BaseReactor // QuitService + p2p.Switch
	// contains filtered or unexported fields
}

func NewConsensusReactor 

func NewConsensusReactor(consensusState *ConsensusState, blockStore *bc.BlockStore, fastSync bool) *ConsensusReactor

func (*ConsensusReactor) AddPeer 

func (conR *ConsensusReactor) AddPeer(peer *p2p.Peer)

Implements Reactor

func (*ConsensusReactor) GetChannels 

func (conR *ConsensusReactor) GetChannels() []*p2p.ChannelDescriptor

Implements Reactor

func (*ConsensusReactor) OnStart 

func (conR *ConsensusReactor) OnStart() error

func (*ConsensusReactor) OnStop 

func (conR *ConsensusReactor) OnStop()

func (*ConsensusReactor) Receive 

func (conR *ConsensusReactor) Receive(chID byte, src *p2p.Peer, msgBytes []byte)

Implements Reactor NOTE: We process these messages even when we're fast_syncing. Messages affect either a peer state or the consensus state. Peer state updates can happen in parallel, but processing of proposals, block parts, and votes are ordered by the receiveRoutine NOTE: blocks on consensus state for proposals, block parts, and votes

func (*ConsensusReactor) RemovePeer 

func (conR *ConsensusReactor) RemovePeer(peer *p2p.Peer, reason interface{})

Implements Reactor

func (*ConsensusReactor) SetEventSwitch 

func (conR *ConsensusReactor) SetEventSwitch(evsw types.EventSwitch)

implements events.Eventable

func (*ConsensusReactor) SetPrivValidator 

func (conR *ConsensusReactor) SetPrivValidator(priv *types.PrivValidator)

Sets our private validator account for signing votes.

func (*ConsensusReactor) SwitchToConsensus 

func (conR *ConsensusReactor) SwitchToConsensus(state *sm.State)

Switch from the fast_sync to the consensus: reset the state, turn off fast_sync, start the consensus-state-machine

type ConsensusState 

type ConsensusState struct {
	QuitService

	RoundState
	// contains filtered or unexported fields
}

Tracks consensus state across block heights and rounds.

func NewConsensusState 

func NewConsensusState(config cfg.Config, state *sm.State, proxyAppConn proxy.AppConnConsensus, blockStore *bc.BlockStore, mempool *mempl.Mempool) *ConsensusState

func (*ConsensusState) AddProposalBlockPart 

func (cs *ConsensusState) AddProposalBlockPart(height, round int, part *types.Part, peerKey string) error

May block on send if queue is full.

func (*ConsensusState) AddVote 

func (cs *ConsensusState) AddVote(valIndex int, vote *types.Vote, peerKey string) (added bool, address []byte, err error)

May block on send if queue is full.

func (*ConsensusState) GetRoundState 

func (cs *ConsensusState) GetRoundState() *RoundState

func (*ConsensusState) GetState 

func (cs *ConsensusState) GetState() *sm.State

func (*ConsensusState) GetValidators added in v0.7.3 

func (cs *ConsensusState) GetValidators() (int, []*types.Validator)

func (*ConsensusState) OnStart 

func (cs *ConsensusState) OnStart() error

func (*ConsensusState) OnStop 

func (cs *ConsensusState) OnStop()

func (*ConsensusState) OpenWAL 

func (cs *ConsensusState) OpenWAL(file string) (err error)

Open file to log all consensus messages and timeouts for deterministic accountability

func (ConsensusState) ReplayConsole 

func (cs ConsensusState) ReplayConsole(file string) error

Interactive playback

func (ConsensusState) ReplayMessages 

func (cs ConsensusState) ReplayMessages(file string) error

Full playback, with tests

func (*ConsensusState) SetEventSwitch 

func (cs *ConsensusState) SetEventSwitch(evsw types.EventSwitch)

implements events.Eventable

func (*ConsensusState) SetPrivValidator 

func (cs *ConsensusState) SetPrivValidator(priv *types.PrivValidator)

func (*ConsensusState) SetProposal 

func (cs *ConsensusState) SetProposal(proposal *types.Proposal, peerKey string) error

May block on send if queue is full.

func (*ConsensusState) SetProposalAndBlock 

func (cs *ConsensusState) SetProposalAndBlock(proposal *types.Proposal, block *types.Block, parts *types.PartSet, peerKey string) error

May block on send if queue is full.

func (*ConsensusState) String 

func (cs *ConsensusState) String() string

type HasVoteMessage 

type HasVoteMessage struct {
	Height int
	Round  int
	Type   byte
	Index  int
}

func (*HasVoteMessage) String 

func (m *HasVoteMessage) String() string

type HeightVoteSet 

type HeightVoteSet struct {
	// contains filtered or unexported fields
}

Keeps track of all VoteSets from round 0 to round 'round'.

Also keeps track of up to one RoundVoteSet greater than 'round' from each peer, to facilitate catchup syncing of commits.

A commit is +2/3 precommits for a block at a round, but which round is not known in advance, so when a peer provides a precommit for a round greater than mtx.round, we create a new entry in roundVoteSets but also remember the peer to prevent abuse.

func NewHeightVoteSet 

func NewHeightVoteSet(chainID string, height int, valSet *types.ValidatorSet) *HeightVoteSet

func (*HeightVoteSet) AddByIndex 

func (hvs *HeightVoteSet) AddByIndex(valIndex int, vote *types.Vote, peerKey string) (added bool, address []byte, err error)

Duplicate votes return added=false, err=nil. By convention, peerKey is "" if origin is self.

func (*HeightVoteSet) Height 

func (hvs *HeightVoteSet) Height() int

func (*HeightVoteSet) POLRound 

func (hvs *HeightVoteSet) POLRound() int

Last round that has +2/3 prevotes for a particular block or nil. Returns -1 if no such round exists.

func (*HeightVoteSet) Precommits 

func (hvs *HeightVoteSet) Precommits(round int) *types.VoteSet

func (*HeightVoteSet) Prevotes 

func (hvs *HeightVoteSet) Prevotes(round int) *types.VoteSet

func (*HeightVoteSet) Reset 

func (hvs *HeightVoteSet) Reset(height int, valSet *types.ValidatorSet)

func (*HeightVoteSet) Round 

func (hvs *HeightVoteSet) Round() int

func (*HeightVoteSet) SetRound 

func (hvs *HeightVoteSet) SetRound(round int)

Create more RoundVoteSets up to round.

func (*HeightVoteSet) String 

func (hvs *HeightVoteSet) String() string

func (*HeightVoteSet) StringIndented 

func (hvs *HeightVoteSet) StringIndented(indent string) string

type NewRoundStepMessage 

type NewRoundStepMessage struct {
	Height                int
	Round                 int
	Step                  RoundStepType
	SecondsSinceStartTime int
	LastCommitRound       int
}

For every height/round/step transition

func (*NewRoundStepMessage) String 

func (m *NewRoundStepMessage) String() string

type PeerRoundState 

type PeerRoundState struct {
	Height                   int                 // Height peer is at
	Round                    int                 // Round peer is at, -1 if unknown.
	Step                     RoundStepType       // Step peer is at
	StartTime                time.Time           // Estimated start of round 0 at this height
	Proposal                 bool                // True if peer has proposal for this round
	ProposalBlockPartsHeader types.PartSetHeader //
	ProposalBlockParts       *BitArray           //
	ProposalPOLRound         int                 // Proposal's POL round. -1 if none.
	ProposalPOL              *BitArray           // nil until ProposalPOLMessage received.
	Prevotes                 *BitArray           // All votes peer has for this round
	Precommits               *BitArray           // All precommits peer has for this round
	LastCommitRound          int                 // Round of commit for last height. -1 if none.
	LastCommit               *BitArray           // All commit precommits of commit for last height.
	CatchupCommitRound       int                 // Round that we have commit for. Not necessarily unique. -1 if none.
	CatchupCommit            *BitArray           // All commit precommits peer has for this height & CatchupCommitRound
}

Read only when returned by PeerState.GetRoundState().

type PeerState 

type PeerState struct {
	Peer *p2p.Peer

	PeerRoundState
	// contains filtered or unexported fields
}

func NewPeerState 

func NewPeerState(peer *p2p.Peer) *PeerState

func (*PeerState) ApplyCommitStepMessage 

func (ps *PeerState) ApplyCommitStepMessage(msg *CommitStepMessage)

func (*PeerState) ApplyHasVoteMessage 

func (ps *PeerState) ApplyHasVoteMessage(msg *HasVoteMessage)

func (*PeerState) ApplyNewRoundStepMessage 

func (ps *PeerState) ApplyNewRoundStepMessage(msg *NewRoundStepMessage)

func (*PeerState) ApplyProposalPOLMessage 

func (ps *PeerState) ApplyProposalPOLMessage(msg *ProposalPOLMessage)

func (*PeerState) EnsureVoteBitArrays 

func (ps *PeerState) EnsureVoteBitArrays(height int, numValidators int)

NOTE: It's important to make sure that numValidators actually matches what the node sees as the number of validators for height.

func (*PeerState) GetHeight 

func (ps *PeerState) GetHeight() int

Returns an atomic snapshot of the PeerRoundState's height used by the mempool to ensure peers are caught up before broadcasting new txs

func (*PeerState) GetRoundState 

func (ps *PeerState) GetRoundState() *PeerRoundState

Returns an atomic snapshot of the PeerRoundState. There's no point in mutating it since it won't change PeerState.

func (*PeerState) PickSendVote 

func (ps *PeerState) PickSendVote(votes types.VoteSetReader) (ok bool)

Convenience function to send vote to peer. Returns true if vote was sent.

func (*PeerState) PickVoteToSend 

func (ps *PeerState) PickVoteToSend(votes types.VoteSetReader) (index int, vote *types.Vote, ok bool)

votes: Must be the correct Size() for the Height().

func (*PeerState) SetHasProposal 

func (ps *PeerState) SetHasProposal(proposal *types.Proposal)

func (*PeerState) SetHasProposalBlockPart 

func (ps *PeerState) SetHasProposalBlockPart(height int, round int, index int)

func (*PeerState) SetHasVote 

func (ps *PeerState) SetHasVote(vote *types.Vote, index int)

type ProposalMessage 

type ProposalMessage struct {
	Proposal *types.Proposal
}

func (*ProposalMessage) String 

func (m *ProposalMessage) String() string

type ProposalPOLMessage 

type ProposalPOLMessage struct {
	Height           int
	ProposalPOLRound int
	ProposalPOL      *BitArray
}

func (*ProposalPOLMessage) String 

func (m *ProposalPOLMessage) String() string

type RoundState 

type RoundState struct {
	Height             int // Height we are working on
	Round              int
	Step               RoundStepType
	StartTime          time.Time
	CommitTime         time.Time // Subjective time when +2/3 precommits for Block at Round were found
	Validators         *types.ValidatorSet
	Proposal           *types.Proposal
	ProposalBlock      *types.Block
	ProposalBlockParts *types.PartSet
	LockedRound        int
	LockedBlock        *types.Block
	LockedBlockParts   *types.PartSet
	Votes              *HeightVoteSet
	CommitRound        int            //
	LastCommit         *types.VoteSet // Last precommits at Height-1
	LastValidators     *types.ValidatorSet
}

Immutable when returned from ConsensusState.GetRoundState()

func (*RoundState) RoundStateEvent 

func (rs *RoundState) RoundStateEvent() types.EventDataRoundState

func (*RoundState) String 

func (rs *RoundState) String() string

func (*RoundState) StringIndented 

func (rs *RoundState) StringIndented(indent string) string

func (*RoundState) StringShort 

func (rs *RoundState) StringShort() string

type RoundStepType 

type RoundStepType uint8 // These must be numeric, ordered.

func (RoundStepType) String 

func (rs RoundStepType) String() string

type RoundVoteSet 

type RoundVoteSet struct {
	Prevotes   *types.VoteSet
	Precommits *types.VoteSet
}

type TimeoutParams 

type TimeoutParams struct {
	Propose0       int
	ProposeDelta   int
	Prevote0       int
	PrevoteDelta   int
	Precommit0     int
	PrecommitDelta int
	Commit0        int
}

All in milliseconds

func InitTimeoutParamsFromConfig 

func InitTimeoutParamsFromConfig(config cfg.Config) *TimeoutParams

Initialize parameters from config

func (*TimeoutParams) Commit 

func (tp *TimeoutParams) Commit(t time.Time) time.Time

After receiving +2/3 precommits for a single block (a commit), wait this long for stragglers in the next height's RoundStepNewHeight

func (*TimeoutParams) Precommit 

func (tp *TimeoutParams) Precommit(round int) time.Duration

After receiving any +2/3 precommits, wait this long for stragglers

func (*TimeoutParams) Prevote 

func (tp *TimeoutParams) Prevote(round int) time.Duration

After receiving any +2/3 prevote, wait this long for stragglers

func (*TimeoutParams) Propose 

func (tp *TimeoutParams) Propose(round int) time.Duration

Wait this long for a proposal

type VoteMessage 

type VoteMessage struct {
	ValidatorIndex int
	Vote           *types.Vote
}

func (*VoteMessage) String 

func (m *VoteMessage) String() string

type WAL 

type WAL struct {
	// contains filtered or unexported fields
}

Write ahead logger writes msgs to disk before they are processed. Can be used for crash-recovery and deterministic replay TODO: currently the wal is overwritten during replay catchup 

give it a mode so it's either reading or appending - must read to end to start appending again

func NewWAL 

func NewWAL(file string, light bool) (*WAL, error)

func (*WAL) Close 

func (wal *WAL) Close()

Must not be called concurrently with a write.

func (*WAL) Exists added in v0.7.1 

func (wal *WAL) Exists() bool

func (*WAL) Save 

func (wal *WAL) Save(clm ConsensusLogMessageInterface)

called in newStep and for each pass in receiveRoutine

func (*WAL) SeekFromEnd 

func (wal *WAL) SeekFromEnd(found func([]byte) bool) (nLines int, err error)

func (*WAL) Wait 

func (wal *WAL) Wait()

Source Files

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