consensus

package
v0.29.0-beta1 Latest Latest
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This package is not in the latest version of its module.

 Go to latest Published: Jan 19, 2019 License: Apache-2.0 Imports: 39 Imported by: 0

README

See the consensus spec and the reactor consensus spec for more information.

Documentation

Index

Constants

View Source 
const (
	StateChannel       = byte(0x20)
	DataChannel        = byte(0x21)
	VoteChannel        = byte(0x22)
	VoteSetBitsChannel = byte(0x23)
)
View Source 
const (
	// MetricsSubsystem is a subsystem shared by all metrics exposed by this
	// package.
	MetricsSubsystem = "consensus"
)

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")
)

Functions

func CompareHRS 

func CompareHRS(h1 int64, r1 int, s1 cstypes.RoundStepType, h2 int64, r2 int, s2 cstypes.RoundStepType) int

func IsDataCorruptionError 

func IsDataCorruptionError(err error) bool

IsDataCorruptionError returns true if data has been corrupted inside WAL.

func NewWAL 

func NewWAL(walFile string, groupOptions ...func(*auto.Group)) (*baseWAL, error)

func RegisterConsensusMessages 

func RegisterConsensusMessages(cdc *amino.Codec)

func RegisterWALMessages 

func RegisterWALMessages(cdc *amino.Codec)

func RunReplayFile 

func RunReplayFile(config cfg.BaseConfig, csConfig *cfg.ConsensusConfig, console bool)

replay the wal file

func WALGenerateNBlocks 

func WALGenerateNBlocks(wr io.Writer, numBlocks int) (err error)

WALGenerateNBlocks generates a consensus WAL. It does this by spining up a stripped down version of node (proxy app, event bus, consensus state) with a persistent kvstore application and special consensus wal instance (byteBufferWAL) and waits until numBlocks are created. If the node fails to produce given numBlocks, it returns an error.

func WALWithNBlocks 

func WALWithNBlocks(numBlocks int) (data []byte, err error)

WALWithNBlocks returns a WAL content with numBlocks.

Types

type BlockPartMessage 

type BlockPartMessage struct {
	Height int64
	Round  int
	Part   *types.Part
}

BlockPartMessage is sent when gossipping a piece of the proposed block.

func (*BlockPartMessage) String 

func (m *BlockPartMessage) String() string

String returns a string representation.

func (*BlockPartMessage) ValidateBasic 

func (m *BlockPartMessage) ValidateBasic() error

ValidateBasic performs basic validation.

type ConsensusMessage 

type ConsensusMessage interface {
	ValidateBasic() error
}

ConsensusMessage is a message that can be sent and received on the ConsensusReactor

type ConsensusReactor 

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

ConsensusReactor defines a reactor for the consensus service.

func NewConsensusReactor 

func NewConsensusReactor(consensusState *ConsensusState, fastSync bool, options ...ReactorOption) *ConsensusReactor

NewConsensusReactor returns a new ConsensusReactor with the given consensusState.

func (*ConsensusReactor) AddPeer 

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

AddPeer implements Reactor

func (*ConsensusReactor) FastSync 

func (conR *ConsensusReactor) FastSync() bool

FastSync returns whether the consensus reactor is in fast-sync mode.

func (*ConsensusReactor) GetChannels 

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

GetChannels implements Reactor

func (*ConsensusReactor) OnStart 

func (conR *ConsensusReactor) OnStart() error

OnStart implements BaseService by subscribing to events, which later will be broadcasted to other peers and starting state if we're not in fast sync.

func (*ConsensusReactor) OnStop 

func (conR *ConsensusReactor) OnStop()

OnStop implements BaseService by unsubscribing from events and stopping state.

func (*ConsensusReactor) Receive 

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

Receive 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{})

RemovePeer implements Reactor

func (*ConsensusReactor) SetEventBus 

func (conR *ConsensusReactor) SetEventBus(b *types.EventBus)

SetEventBus sets event bus.

func (*ConsensusReactor) String 

func (conR *ConsensusReactor) String() string

String returns a string representation of the ConsensusReactor. NOTE: For now, it is just a hard-coded string to avoid accessing unprotected shared variables. TODO: improve!

func (*ConsensusReactor) StringIndented 

func (conR *ConsensusReactor) StringIndented(indent string) string

StringIndented returns an indented string representation of the ConsensusReactor

func (*ConsensusReactor) SwitchToConsensus 

func (conR *ConsensusReactor) SwitchToConsensus(state sm.State, blocksSynced int)

SwitchToConsensus switches from fast_sync mode to consensus mode. It resets the state, turns off fast_sync, and starts the consensus state-machine

type ConsensusState 

type ConsensusState struct {
	cmn.BaseService

	cstypes.RoundState
	// contains filtered or unexported fields
}

ConsensusState handles execution of the consensus algorithm. It processes votes and proposals, and upon reaching agreement, commits blocks to the chain and executes them against the application. The internal state machine receives input from peers, the internal validator, and from a timer.

func NewConsensusState 

func NewConsensusState(
	config *cfg.ConsensusConfig,
	state sm.State,
	blockExec *sm.BlockExecutor,
	blockStore sm.BlockStore,
	txNotifier txNotifier,
	evpool evidencePool,
	options ...StateOption,
) *ConsensusState

NewConsensusState returns a new ConsensusState.

func (*ConsensusState) AddProposalBlockPart 

func (cs *ConsensusState) AddProposalBlockPart(height int64, round int, part *types.Part, peerID p2p.ID) error

AddProposalBlockPart inputs a part of the proposal block.

func (*ConsensusState) AddVote 

func (cs *ConsensusState) AddVote(vote *types.Vote, peerID p2p.ID) (added bool, err error)

AddVote inputs a vote.

func (*ConsensusState) GetLastHeight 

func (cs *ConsensusState) GetLastHeight() int64

GetLastHeight returns the last height committed. If there were no blocks, returns 0.

func (*ConsensusState) GetRoundState 

func (cs *ConsensusState) GetRoundState() *cstypes.RoundState

GetRoundState returns a shallow copy of the internal consensus state.

func (*ConsensusState) GetRoundStateJSON 

func (cs *ConsensusState) GetRoundStateJSON() ([]byte, error)

GetRoundStateJSON returns a json of RoundState, marshalled using go-amino.

func (*ConsensusState) GetRoundStateSimpleJSON 

func (cs *ConsensusState) GetRoundStateSimpleJSON() ([]byte, error)

GetRoundStateSimpleJSON returns a json of RoundStateSimple, marshalled using go-amino.

func (*ConsensusState) GetState 

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

GetState returns a copy of the chain state.

func (*ConsensusState) GetValidators 

func (cs *ConsensusState) GetValidators() (int64, []*types.Validator)

GetValidators returns a copy of the current validators.

func (*ConsensusState) LoadCommit 

func (cs *ConsensusState) LoadCommit(height int64) *types.Commit

LoadCommit loads the commit for a given height.

func (*ConsensusState) OnStart 

func (cs *ConsensusState) OnStart() error

OnStart implements cmn.Service. It loads the latest state via the WAL, and starts the timeout and receive routines.

func (*ConsensusState) OnStop 

func (cs *ConsensusState) OnStop()

OnStop implements cmn.Service.

func (*ConsensusState) OpenWAL 

func (cs *ConsensusState) OpenWAL(walFile string) (WAL, error)

OpenWAL opens a file to log all consensus messages and timeouts for deterministic accountability

func (*ConsensusState) ReplayFile 

func (cs *ConsensusState) ReplayFile(file string, console bool) error

Replay msgs in file or start the console

func (*ConsensusState) SetEventBus 

func (cs *ConsensusState) SetEventBus(b *types.EventBus)

SetEventBus sets event bus.

func (*ConsensusState) SetLogger 

func (cs *ConsensusState) SetLogger(l log.Logger)

SetLogger implements Service.

func (*ConsensusState) SetPrivValidator 

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

SetPrivValidator sets the private validator account for signing votes.

func (*ConsensusState) SetProposal 

func (cs *ConsensusState) SetProposal(proposal *types.Proposal, peerID p2p.ID) error

SetProposal inputs a proposal.

func (*ConsensusState) SetProposalAndBlock 

func (cs *ConsensusState) SetProposalAndBlock(proposal *types.Proposal, block *types.Block, parts *types.PartSet, peerID p2p.ID) error

SetProposalAndBlock inputs the proposal and all block parts.

func (*ConsensusState) SetTimeoutTicker 

func (cs *ConsensusState) SetTimeoutTicker(timeoutTicker TimeoutTicker)

SetTimeoutTicker sets the local timer. It may be useful to overwrite for testing.

func (*ConsensusState) String 

func (cs *ConsensusState) String() string

String returns a string.

func (*ConsensusState) Wait 

func (cs *ConsensusState) Wait()

Wait waits for the the main routine to return. NOTE: be sure to Stop() the event switch and drain any event channels or this may deadlock

type DataCorruptionError 

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

DataCorruptionError is an error that occures if data on disk was corrupted.

func (DataCorruptionError) Cause 

func (e DataCorruptionError) Cause() error

func (DataCorruptionError) Error 

func (e DataCorruptionError) Error() string

type EndHeightMessage 

type EndHeightMessage struct {
	Height int64 `json:"height"`
}

EndHeightMessage marks the end of the given height inside WAL. @internal used by scripts/wal2json util.

type Handshaker 

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

func NewHandshaker 

func NewHandshaker(stateDB dbm.DB, state sm.State,
	store sm.BlockStore, genDoc *types.GenesisDoc) *Handshaker

func (*Handshaker) Handshake 

func (h *Handshaker) Handshake(proxyApp proxy.AppConns) error

TODO: retry the handshake/replay if it fails ?

func (*Handshaker) NBlocks 

func (h *Handshaker) NBlocks() int

func (*Handshaker) ReplayBlocks 

func (h *Handshaker) ReplayBlocks(
	state sm.State,
	appHash []byte,
	appBlockHeight int64,
	proxyApp proxy.AppConns,
) ([]byte, error)

Replay all blocks since appBlockHeight and ensure the result matches the current state. Returns the final AppHash or an error.

func (*Handshaker) SetLogger 

func (h *Handshaker) SetLogger(l log.Logger)

type HasVoteMessage 

type HasVoteMessage struct {
	Height int64
	Round  int
	Type   types.SignedMsgType
	Index  int
}

HasVoteMessage is sent to indicate that a particular vote has been received.

func (*HasVoteMessage) String 

func (m *HasVoteMessage) String() string

String returns a string representation.

func (*HasVoteMessage) ValidateBasic 

func (m *HasVoteMessage) ValidateBasic() error

ValidateBasic performs basic validation.

type Metrics 

type Metrics struct {
	// Height of the chain.
	Height metrics.Gauge

	// Number of rounds.
	Rounds metrics.Gauge

	// Number of validators.
	Validators metrics.Gauge
	// Total power of all validators.
	ValidatorsPower metrics.Gauge
	// Number of validators who did not sign.
	MissingValidators metrics.Gauge
	// Total power of the missing validators.
	MissingValidatorsPower metrics.Gauge
	// Number of validators who tried to double sign.
	ByzantineValidators metrics.Gauge
	// Total power of the byzantine validators.
	ByzantineValidatorsPower metrics.Gauge

	// Time between this and the last block.
	BlockIntervalSeconds metrics.Gauge

	// Number of transactions.
	NumTxs metrics.Gauge
	// Size of the block.
	BlockSizeBytes metrics.Gauge
	// Total number of transactions.
	TotalTxs metrics.Gauge
	// The latest block height.
	CommittedHeight metrics.Gauge
	// Whether or not a node is fast syncing. 1 if yes, 0 if no.
	FastSyncing metrics.Gauge

	// Number of blockparts transmitted by peer.
	BlockParts metrics.Counter
}

Metrics contains metrics exposed by this package.

func NopMetrics 

func NopMetrics() *Metrics

NopMetrics returns no-op Metrics.

func PrometheusMetrics 

func PrometheusMetrics(namespace string, labelsAndValues ...string) *Metrics

PrometheusMetrics returns Metrics build using Prometheus client library. Optionally, labels can be provided along with their values ("foo", "fooValue").

type NewRoundStepMessage 

type NewRoundStepMessage struct {
	Height                int64
	Round                 int
	Step                  cstypes.RoundStepType
	SecondsSinceStartTime int
	LastCommitRound       int
}

NewRoundStepMessage is sent for every step taken in the ConsensusState. For every height/round/step transition

func (*NewRoundStepMessage) String 

func (m *NewRoundStepMessage) String() string

String returns a string representation.

func (*NewRoundStepMessage) ValidateBasic 

func (m *NewRoundStepMessage) ValidateBasic() error

ValidateBasic performs basic validation.

type NewValidBlockMessage 

type NewValidBlockMessage struct {
	Height           int64
	Round            int
	BlockPartsHeader types.PartSetHeader
	BlockParts       *cmn.BitArray
	IsCommit         bool
}

NewValidBlockMessage is sent when a validator observes a valid block B in some round r, i.e., there is a Proposal for block B and 2/3+ prevotes for the block B in the round r. In case the block is also committed, then IsCommit flag is set to true.

func (*NewValidBlockMessage) String 

func (m *NewValidBlockMessage) String() string

String returns a string representation.

func (*NewValidBlockMessage) ValidateBasic 

func (m *NewValidBlockMessage) ValidateBasic() error

ValidateBasic performs basic validation.

type PeerState 

type PeerState struct {
	PRS   cstypes.PeerRoundState `json:"round_state"` // Exposed.
	Stats *peerStateStats        `json:"stats"`       // Exposed.
	// contains filtered or unexported fields
}

PeerState contains the known state of a peer, including its connection and threadsafe access to its PeerRoundState. NOTE: THIS GETS DUMPED WITH rpc/core/consensus.go. Be mindful of what you Expose.

func NewPeerState 

func NewPeerState(peer p2p.Peer) *PeerState

NewPeerState returns a new PeerState for the given Peer

func (*PeerState) ApplyHasVoteMessage 

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

ApplyHasVoteMessage updates the peer state for the new vote.

func (*PeerState) ApplyNewRoundStepMessage 

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

ApplyNewRoundStepMessage updates the peer state for the new round.

func (*PeerState) ApplyNewValidBlockMessage 

func (ps *PeerState) ApplyNewValidBlockMessage(msg *NewValidBlockMessage)

ApplyNewValidBlockMessage updates the peer state for the new valid block.

func (*PeerState) ApplyProposalPOLMessage 

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

ApplyProposalPOLMessage updates the peer state for the new proposal POL.

func (*PeerState) ApplyVoteSetBitsMessage 

func (ps *PeerState) ApplyVoteSetBitsMessage(msg *VoteSetBitsMessage, ourVotes *cmn.BitArray)

ApplyVoteSetBitsMessage updates the peer state for the bit-array of votes it claims to have for the corresponding BlockID. `ourVotes` is a BitArray of votes we have for msg.BlockID NOTE: if ourVotes is nil (e.g. msg.Height < rs.Height), we conservatively overwrite ps's votes w/ msg.Votes.

func (*PeerState) BlockPartsSent 

func (ps *PeerState) BlockPartsSent() int

BlockPartsSent returns the number of useful block parts the peer has sent us.

func (*PeerState) EnsureVoteBitArrays 

func (ps *PeerState) EnsureVoteBitArrays(height int64, numValidators int)

EnsureVoteBitArrays ensures the bit-arrays have been allocated for tracking what votes this peer has received. 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() int64

GetHeight 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() *cstypes.PeerRoundState

GetRoundState returns an shallow copy of the PeerRoundState. There's no point in mutating it since it won't change PeerState.

func (*PeerState) InitProposalBlockParts 

func (ps *PeerState) InitProposalBlockParts(partsHeader types.PartSetHeader)

InitProposalBlockParts initializes the peer's proposal block parts header and bit array.

func (*PeerState) PickSendVote 

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

PickSendVote picks a vote and sends it to the peer. Returns true if vote was sent.

func (*PeerState) PickVoteToSend 

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

PickVoteToSend picks a vote to send to the peer. Returns true if a vote was picked. NOTE: `votes` must be the correct Size() for the Height().

func (*PeerState) RecordBlockPart 

func (ps *PeerState) RecordBlockPart() int

RecordBlockPart increments internal block part related statistics for this peer. It returns the total number of added block parts.

func (*PeerState) RecordVote 

func (ps *PeerState) RecordVote() int

RecordVote increments internal votes related statistics for this peer. It returns the total number of added votes.

func (*PeerState) SetHasProposal 

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

SetHasProposal sets the given proposal as known for the peer.

func (*PeerState) SetHasProposalBlockPart 

func (ps *PeerState) SetHasProposalBlockPart(height int64, round int, index int)

SetHasProposalBlockPart sets the given block part index as known for the peer.

func (*PeerState) SetHasVote 

func (ps *PeerState) SetHasVote(vote *types.Vote)

SetHasVote sets the given vote as known by the peer

func (*PeerState) SetLogger 

func (ps *PeerState) SetLogger(logger log.Logger) *PeerState

SetLogger allows to set a logger on the peer state. Returns the peer state itself.

func (*PeerState) String 

func (ps *PeerState) String() string

String returns a string representation of the PeerState

func (*PeerState) StringIndented 

func (ps *PeerState) StringIndented(indent string) string

StringIndented returns a string representation of the PeerState

func (*PeerState) ToJSON 

func (ps *PeerState) ToJSON() ([]byte, error)

ToJSON returns a json of PeerState, marshalled using go-amino.

func (*PeerState) VotesSent 

func (ps *PeerState) VotesSent() int

VotesSent returns the number of blocks for which peer has been sending us votes.

type ProposalMessage 

type ProposalMessage struct {
	Proposal *types.Proposal
}

ProposalMessage is sent when a new block is proposed.

func (*ProposalMessage) String 

func (m *ProposalMessage) String() string

String returns a string representation.

func (*ProposalMessage) ValidateBasic 

func (m *ProposalMessage) ValidateBasic() error

ValidateBasic performs basic validation.

type ProposalPOLMessage 

type ProposalPOLMessage struct {
	Height           int64
	ProposalPOLRound int
	ProposalPOL      *cmn.BitArray
}

ProposalPOLMessage is sent when a previous proposal is re-proposed.

func (*ProposalPOLMessage) String 

func (m *ProposalPOLMessage) String() string

String returns a string representation.

func (*ProposalPOLMessage) ValidateBasic 

func (m *ProposalPOLMessage) ValidateBasic() error

ValidateBasic performs basic validation.

type ReactorOption 

type ReactorOption func(*ConsensusReactor)

func ReactorMetrics 

func ReactorMetrics(metrics *Metrics) ReactorOption

ReactorMetrics sets the metrics

type StateOption 

type StateOption func(*ConsensusState)

StateOption sets an optional parameter on the ConsensusState.

func StateMetrics 

func StateMetrics(metrics *Metrics) StateOption

StateMetrics sets the metrics.

type TimedWALMessage 

type TimedWALMessage struct {
	Time time.Time  `json:"time"` // for debugging purposes
	Msg  WALMessage `json:"msg"`
}

type TimeoutTicker 

type TimeoutTicker interface {
	Start() error
	Stop() error
	Chan() <-chan timeoutInfo       // on which to receive a timeout
	ScheduleTimeout(ti timeoutInfo) // reset the timer

	SetLogger(log.Logger)
}

TimeoutTicker is a timer that schedules timeouts conditional on the height/round/step in the timeoutInfo. The timeoutInfo.Duration may be non-positive.

func NewTimeoutTicker 

func NewTimeoutTicker() TimeoutTicker

NewTimeoutTicker returns a new TimeoutTicker.

type VoteMessage 

type VoteMessage struct {
	Vote *types.Vote
}

VoteMessage is sent when voting for a proposal (or lack thereof).

func (*VoteMessage) String 

func (m *VoteMessage) String() string

String returns a string representation.

func (*VoteMessage) ValidateBasic 

func (m *VoteMessage) ValidateBasic() error

ValidateBasic performs basic validation.

type VoteSetBitsMessage 

type VoteSetBitsMessage struct {
	Height  int64
	Round   int
	Type    types.SignedMsgType
	BlockID types.BlockID
	Votes   *cmn.BitArray
}

VoteSetBitsMessage is sent to communicate the bit-array of votes seen for the BlockID.

func (*VoteSetBitsMessage) String 

func (m *VoteSetBitsMessage) String() string

String returns a string representation.

func (*VoteSetBitsMessage) ValidateBasic 

func (m *VoteSetBitsMessage) ValidateBasic() error

ValidateBasic performs basic validation.

type VoteSetMaj23Message 

type VoteSetMaj23Message struct {
	Height  int64
	Round   int
	Type    types.SignedMsgType
	BlockID types.BlockID
}

VoteSetMaj23Message is sent to indicate that a given BlockID has seen +2/3 votes.

func (*VoteSetMaj23Message) String 

func (m *VoteSetMaj23Message) String() string

String returns a string representation.

func (*VoteSetMaj23Message) ValidateBasic 

func (m *VoteSetMaj23Message) ValidateBasic() error

ValidateBasic performs basic validation.

type WAL 

type WAL interface {
	Write(WALMessage)
	WriteSync(WALMessage)
	Group() *auto.Group
	SearchForEndHeight(height int64, options *WALSearchOptions) (gr *auto.GroupReader, found bool, err error)

	Start() error
	Stop() error
	Wait()
}

WAL is an interface for any write-ahead logger.

type WALDecoder 

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

A WALDecoder reads and decodes custom-encoded WAL messages from an input stream. See WALEncoder for the format used.

It will also compare the checksums and make sure data size is equal to the length from the header. If that is not the case, error will be returned.

func NewWALDecoder 

func NewWALDecoder(rd io.Reader) *WALDecoder

NewWALDecoder returns a new decoder that reads from rd.

func (*WALDecoder) Decode 

func (dec *WALDecoder) Decode() (*TimedWALMessage, error)

Decode reads the next custom-encoded value from its reader and returns it.

type WALEncoder 

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

A WALEncoder writes custom-encoded WAL messages to an output stream.

Format: 4 bytes CRC sum + 4 bytes length + arbitrary-length value (go-amino encoded)

func NewWALEncoder 

func NewWALEncoder(wr io.Writer) *WALEncoder

NewWALEncoder returns a new encoder that writes to wr.

func (*WALEncoder) Encode 

func (enc *WALEncoder) Encode(v *TimedWALMessage) error

Encode writes the custom encoding of v to the stream.

type WALMessage 

type WALMessage interface{}

type WALSearchOptions 

type WALSearchOptions struct {
	// IgnoreDataCorruptionErrors set to true will result in skipping data corruption errors.
	IgnoreDataCorruptionErrors bool
}

WALSearchOptions are optional arguments to SearchForEndHeight.

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