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1542 lines
53 KiB
1542 lines
53 KiB
package consensus
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import (
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"bytes"
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"errors"
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"fmt"
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"path"
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"reflect"
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"sync"
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"time"
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fail "github.com/ebuchman/fail-test"
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wire "github.com/tendermint/go-wire"
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cfg "github.com/tendermint/tendermint/config"
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"github.com/tendermint/tendermint/proxy"
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sm "github.com/tendermint/tendermint/state"
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"github.com/tendermint/tendermint/types"
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cmn "github.com/tendermint/tmlibs/common"
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"github.com/tendermint/tmlibs/log"
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)
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//-----------------------------------------------------------------------------
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// Config
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//-----------------------------------------------------------------------------
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// Errors
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var (
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ErrInvalidProposalSignature = errors.New("Error invalid proposal signature")
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ErrInvalidProposalPOLRound = errors.New("Error invalid proposal POL round")
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ErrAddingVote = errors.New("Error adding vote")
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ErrVoteHeightMismatch = errors.New("Error vote height mismatch")
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)
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//-----------------------------------------------------------------------------
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// RoundStepType enum type
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// RoundStepType enumerates the state of the consensus state machine
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type RoundStepType uint8 // These must be numeric, ordered.
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const (
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RoundStepNewHeight = RoundStepType(0x01) // Wait til CommitTime + timeoutCommit
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RoundStepNewRound = RoundStepType(0x02) // Setup new round and go to RoundStepPropose
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RoundStepPropose = RoundStepType(0x03) // Did propose, gossip proposal
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RoundStepPrevote = RoundStepType(0x04) // Did prevote, gossip prevotes
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RoundStepPrevoteWait = RoundStepType(0x05) // Did receive any +2/3 prevotes, start timeout
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RoundStepPrecommit = RoundStepType(0x06) // Did precommit, gossip precommits
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RoundStepPrecommitWait = RoundStepType(0x07) // Did receive any +2/3 precommits, start timeout
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RoundStepCommit = RoundStepType(0x08) // Entered commit state machine
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// NOTE: RoundStepNewHeight acts as RoundStepCommitWait.
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)
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// String returns a string
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func (rs RoundStepType) String() string {
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switch rs {
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case RoundStepNewHeight:
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return "RoundStepNewHeight"
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case RoundStepNewRound:
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return "RoundStepNewRound"
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case RoundStepPropose:
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return "RoundStepPropose"
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case RoundStepPrevote:
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return "RoundStepPrevote"
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case RoundStepPrevoteWait:
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return "RoundStepPrevoteWait"
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case RoundStepPrecommit:
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return "RoundStepPrecommit"
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case RoundStepPrecommitWait:
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return "RoundStepPrecommitWait"
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case RoundStepCommit:
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return "RoundStepCommit"
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default:
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return "RoundStepUnknown" // Cannot panic.
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}
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}
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//-----------------------------------------------------------------------------
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// RoundState defines the internal consensus state.
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// It is Immutable when returned from ConsensusState.GetRoundState()
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// TODO: Actually, only the top pointer is copied,
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// so access to field pointers is still racey
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type RoundState struct {
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Height int // Height we are working on
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Round int
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Step RoundStepType
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StartTime time.Time
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CommitTime time.Time // Subjective time when +2/3 precommits for Block at Round were found
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Validators *types.ValidatorSet
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Proposal *types.Proposal
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ProposalBlock *types.Block
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ProposalBlockParts *types.PartSet
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LockedRound int
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LockedBlock *types.Block
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LockedBlockParts *types.PartSet
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Votes *HeightVoteSet
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CommitRound int //
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LastCommit *types.VoteSet // Last precommits at Height-1
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LastValidators *types.ValidatorSet
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}
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// RoundStateEvent returns the H/R/S of the RoundState as an event.
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func (rs *RoundState) RoundStateEvent() types.EventDataRoundState {
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edrs := types.EventDataRoundState{
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Height: rs.Height,
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Round: rs.Round,
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Step: rs.Step.String(),
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RoundState: rs,
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}
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return edrs
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}
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// String returns a string
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func (rs *RoundState) String() string {
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return rs.StringIndented("")
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}
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// StringIndented returns a string
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func (rs *RoundState) StringIndented(indent string) string {
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return fmt.Sprintf(`RoundState{
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%s H:%v R:%v S:%v
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%s StartTime: %v
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%s CommitTime: %v
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%s Validators: %v
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%s Proposal: %v
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%s ProposalBlock: %v %v
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%s LockedRound: %v
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%s LockedBlock: %v %v
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%s Votes: %v
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%s LastCommit: %v
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%s LastValidators: %v
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%s}`,
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indent, rs.Height, rs.Round, rs.Step,
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indent, rs.StartTime,
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indent, rs.CommitTime,
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indent, rs.Validators.StringIndented(indent+" "),
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indent, rs.Proposal,
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indent, rs.ProposalBlockParts.StringShort(), rs.ProposalBlock.StringShort(),
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indent, rs.LockedRound,
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indent, rs.LockedBlockParts.StringShort(), rs.LockedBlock.StringShort(),
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indent, rs.Votes.StringIndented(indent+" "),
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indent, rs.LastCommit.StringShort(),
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indent, rs.LastValidators.StringIndented(indent+" "),
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indent)
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}
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// StringShort returns a string
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func (rs *RoundState) StringShort() string {
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return fmt.Sprintf(`RoundState{H:%v R:%v S:%v ST:%v}`,
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rs.Height, rs.Round, rs.Step, rs.StartTime)
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}
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//-----------------------------------------------------------------------------
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var (
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msgQueueSize = 1000
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)
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// msgs from the reactor which may update the state
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type msgInfo struct {
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Msg ConsensusMessage `json:"msg"`
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PeerKey string `json:"peer_key"`
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}
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// internally generated messages which may update the state
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type timeoutInfo struct {
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Duration time.Duration `json:"duration"`
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Height int `json:"height"`
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Round int `json:"round"`
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Step RoundStepType `json:"step"`
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}
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func (ti *timeoutInfo) String() string {
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return fmt.Sprintf("%v ; %d/%d %v", ti.Duration, ti.Height, ti.Round, ti.Step)
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}
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// PrivValidator is a validator that can sign votes and proposals.
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type PrivValidator interface {
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GetAddress() []byte
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SignVote(chainID string, vote *types.Vote) error
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SignProposal(chainID string, proposal *types.Proposal) error
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}
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// ConsensusState handles execution of the consensus algorithm.
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// It processes votes and proposals, and upon reaching agreement,
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// commits blocks to the chain and executes them against the application.
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// The internal state machine receives input from peers, the internal validator, and from a timer.
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type ConsensusState struct {
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cmn.BaseService
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// config details
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config *cfg.ConsensusConfig
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privValidator PrivValidator // for signing votes
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// services for creating and executing blocks
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proxyAppConn proxy.AppConnConsensus
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blockStore types.BlockStore
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mempool types.Mempool
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// internal state
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mtx sync.Mutex
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RoundState
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state *sm.State // State until height-1.
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// state changes may be triggered by msgs from peers,
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// msgs from ourself, or by timeouts
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peerMsgQueue chan msgInfo
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internalMsgQueue chan msgInfo
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timeoutTicker TimeoutTicker
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// we use PubSub to trigger msg broadcasts in the reactor,
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// and to notify external subscribers, eg. through a websocket
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evsw types.EventSwitch
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// a Write-Ahead Log ensures we can recover from any kind of crash
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// and helps us avoid signing conflicting votes
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wal *WAL
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replayMode bool // so we don't log signing errors during replay
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// for tests where we want to limit the number of transitions the state makes
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nSteps int
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// some functions can be overwritten for testing
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decideProposal func(height, round int)
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doPrevote func(height, round int)
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setProposal func(proposal *types.Proposal) error
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// closed when we finish shutting down
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done chan struct{}
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}
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// NewConsensusState returns a new ConsensusState.
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func NewConsensusState(config *cfg.ConsensusConfig, state *sm.State, proxyAppConn proxy.AppConnConsensus, blockStore types.BlockStore, mempool types.Mempool) *ConsensusState {
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cs := &ConsensusState{
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config: config,
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proxyAppConn: proxyAppConn,
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blockStore: blockStore,
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mempool: mempool,
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peerMsgQueue: make(chan msgInfo, msgQueueSize),
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internalMsgQueue: make(chan msgInfo, msgQueueSize),
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timeoutTicker: NewTimeoutTicker(),
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done: make(chan struct{}),
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}
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// set function defaults (may be overwritten before calling Start)
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cs.decideProposal = cs.defaultDecideProposal
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cs.doPrevote = cs.defaultDoPrevote
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cs.setProposal = cs.defaultSetProposal
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cs.updateToState(state)
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// Don't call scheduleRound0 yet.
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// We do that upon Start().
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cs.reconstructLastCommit(state)
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cs.BaseService = *cmn.NewBaseService(nil, "ConsensusState", cs)
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return cs
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}
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//----------------------------------------
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// Public interface
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// SetLogger implements Service.
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func (cs *ConsensusState) SetLogger(l log.Logger) {
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cs.BaseService.Logger = l
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cs.timeoutTicker.SetLogger(l)
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}
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// SetEventSwitch implements events.Eventable
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func (cs *ConsensusState) SetEventSwitch(evsw types.EventSwitch) {
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cs.evsw = evsw
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}
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// String returns a string.
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func (cs *ConsensusState) String() string {
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// better not to access shared variables
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return cmn.Fmt("ConsensusState") //(H:%v R:%v S:%v", cs.Height, cs.Round, cs.Step)
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}
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// GetState returns a copy of the chain state.
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func (cs *ConsensusState) GetState() *sm.State {
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cs.mtx.Lock()
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defer cs.mtx.Unlock()
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return cs.state.Copy()
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}
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// GetRoundState returns a copy of the internal consensus state.
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func (cs *ConsensusState) GetRoundState() *RoundState {
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cs.mtx.Lock()
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defer cs.mtx.Unlock()
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return cs.getRoundState()
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}
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func (cs *ConsensusState) getRoundState() *RoundState {
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rs := cs.RoundState // copy
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return &rs
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}
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// GetValidators returns a copy of the current validators.
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func (cs *ConsensusState) GetValidators() (int, []*types.Validator) {
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cs.mtx.Lock()
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defer cs.mtx.Unlock()
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return cs.state.LastBlockHeight, cs.state.Validators.Copy().Validators
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}
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// SetPrivValidator sets the private validator account for signing votes.
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func (cs *ConsensusState) SetPrivValidator(priv PrivValidator) {
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cs.mtx.Lock()
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defer cs.mtx.Unlock()
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cs.privValidator = priv
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}
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// SetTimeoutTicker sets the local timer. It may be useful to overwrite for testing.
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func (cs *ConsensusState) SetTimeoutTicker(timeoutTicker TimeoutTicker) {
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cs.mtx.Lock()
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defer cs.mtx.Unlock()
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cs.timeoutTicker = timeoutTicker
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}
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// LoadCommit loads the commit for a given height.
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func (cs *ConsensusState) LoadCommit(height int) *types.Commit {
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cs.mtx.Lock()
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defer cs.mtx.Unlock()
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if height == cs.blockStore.Height() {
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return cs.blockStore.LoadSeenCommit(height)
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}
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return cs.blockStore.LoadBlockCommit(height)
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}
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// OnStart implements cmn.Service.
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// It loads the latest state via the WAL, and starts the timeout and receive routines.
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func (cs *ConsensusState) OnStart() error {
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walFile := cs.config.WalFile()
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if err := cs.OpenWAL(walFile); err != nil {
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cs.Logger.Error("Error loading ConsensusState wal", "err", err.Error())
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return err
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}
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// we need the timeoutRoutine for replay so
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// we don't block on the tick chan.
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// NOTE: we will get a build up of garbage go routines
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// firing on the tockChan until the receiveRoutine is started
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// to deal with them (by that point, at most one will be valid)
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cs.timeoutTicker.Start()
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// we may have lost some votes if the process crashed
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// reload from consensus log to catchup
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if err := cs.catchupReplay(cs.Height); err != nil {
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cs.Logger.Error("Error on catchup replay. Proceeding to start ConsensusState anyway", "err", err.Error())
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// NOTE: if we ever do return an error here,
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// make sure to stop the timeoutTicker
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}
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// now start the receiveRoutine
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go cs.receiveRoutine(0)
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// schedule the first round!
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// use GetRoundState so we don't race the receiveRoutine for access
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cs.scheduleRound0(cs.GetRoundState())
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return nil
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}
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// timeoutRoutine: receive requests for timeouts on tickChan and fire timeouts on tockChan
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// receiveRoutine: serializes processing of proposoals, block parts, votes; coordinates state transitions
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func (cs *ConsensusState) startRoutines(maxSteps int) {
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cs.timeoutTicker.Start()
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go cs.receiveRoutine(maxSteps)
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}
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// OnStop implements cmn.Service. It stops all routines and waits for the WAL to finish.
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func (cs *ConsensusState) OnStop() {
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cs.BaseService.OnStop()
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cs.timeoutTicker.Stop()
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// Make BaseService.Wait() wait until cs.wal.Wait()
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if cs.wal != nil && cs.IsRunning() {
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cs.wal.Wait()
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}
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}
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// Wait waits for the the main routine to return.
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// NOTE: be sure to Stop() the event switch and drain
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// any event channels or this may deadlock
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func (cs *ConsensusState) Wait() {
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<-cs.done
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}
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// OpenWAL opens a file to log all consensus messages and timeouts for deterministic accountability
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func (cs *ConsensusState) OpenWAL(walFile string) (err error) {
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err = cmn.EnsureDir(path.Dir(walFile), 0700)
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if err != nil {
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cs.Logger.Error("Error ensuring ConsensusState wal dir", "err", err.Error())
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return err
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}
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cs.mtx.Lock()
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defer cs.mtx.Unlock()
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wal, err := NewWAL(walFile, cs.config.WalLight)
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if err != nil {
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return err
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}
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wal.SetLogger(cs.Logger.With("wal", walFile))
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if _, err := wal.Start(); err != nil {
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return err
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}
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cs.wal = wal
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return nil
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}
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//------------------------------------------------------------
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// Public interface for passing messages into the consensus state, possibly causing a state transition.
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// If peerKey == "", the msg is considered internal.
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// Messages are added to the appropriate queue (peer or internal).
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// If the queue is full, the function may block.
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// TODO: should these return anything or let callers just use events?
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// AddVote inputs a vote.
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func (cs *ConsensusState) AddVote(vote *types.Vote, peerKey string) (added bool, err error) {
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if peerKey == "" {
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cs.internalMsgQueue <- msgInfo{&VoteMessage{vote}, ""}
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} else {
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cs.peerMsgQueue <- msgInfo{&VoteMessage{vote}, peerKey}
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}
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// TODO: wait for event?!
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return false, nil
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}
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// SetProposal inputs a proposal.
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func (cs *ConsensusState) SetProposal(proposal *types.Proposal, peerKey string) error {
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if peerKey == "" {
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cs.internalMsgQueue <- msgInfo{&ProposalMessage{proposal}, ""}
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} else {
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cs.peerMsgQueue <- msgInfo{&ProposalMessage{proposal}, peerKey}
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}
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// TODO: wait for event?!
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return nil
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}
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// AddProposalBlockPart inputs a part of the proposal block.
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func (cs *ConsensusState) AddProposalBlockPart(height, round int, part *types.Part, peerKey string) error {
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if peerKey == "" {
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cs.internalMsgQueue <- msgInfo{&BlockPartMessage{height, round, part}, ""}
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} else {
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cs.peerMsgQueue <- msgInfo{&BlockPartMessage{height, round, part}, peerKey}
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}
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// TODO: wait for event?!
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return nil
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}
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// SetProposalAndBlock inputs the proposal and all block parts.
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func (cs *ConsensusState) SetProposalAndBlock(proposal *types.Proposal, block *types.Block, parts *types.PartSet, peerKey string) error {
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cs.SetProposal(proposal, peerKey)
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for i := 0; i < parts.Total(); i++ {
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part := parts.GetPart(i)
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cs.AddProposalBlockPart(proposal.Height, proposal.Round, part, peerKey)
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}
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return nil // TODO errors
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}
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//------------------------------------------------------------
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// internal functions for managing the state
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func (cs *ConsensusState) updateHeight(height int) {
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cs.Height = height
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}
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func (cs *ConsensusState) updateRoundStep(round int, step RoundStepType) {
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cs.Round = round
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cs.Step = step
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}
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// enterNewRound(height, 0) at cs.StartTime.
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func (cs *ConsensusState) scheduleRound0(rs *RoundState) {
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//cs.Logger.Info("scheduleRound0", "now", time.Now(), "startTime", cs.StartTime)
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sleepDuration := rs.StartTime.Sub(time.Now())
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cs.scheduleTimeout(sleepDuration, rs.Height, 0, RoundStepNewHeight)
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}
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// Attempt to schedule a timeout (by sending timeoutInfo on the tickChan)
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func (cs *ConsensusState) scheduleTimeout(duration time.Duration, height, round int, step RoundStepType) {
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cs.timeoutTicker.ScheduleTimeout(timeoutInfo{duration, height, round, step})
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}
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// send a msg into the receiveRoutine regarding our own proposal, block part, or vote
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func (cs *ConsensusState) sendInternalMessage(mi msgInfo) {
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select {
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case cs.internalMsgQueue <- mi:
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default:
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// NOTE: using the go-routine means our votes can
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// be processed out of order.
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// TODO: use CList here for strict determinism and
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// attempt push to internalMsgQueue in receiveRoutine
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cs.Logger.Info("Internal msg queue is full. Using a go-routine")
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go func() { cs.internalMsgQueue <- mi }()
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}
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}
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// Reconstruct LastCommit from SeenCommit, which we saved along with the block,
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// (which happens even before saving the state)
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func (cs *ConsensusState) reconstructLastCommit(state *sm.State) {
|
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if state.LastBlockHeight == 0 {
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return
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}
|
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seenCommit := cs.blockStore.LoadSeenCommit(state.LastBlockHeight)
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lastPrecommits := types.NewVoteSet(cs.state.ChainID, state.LastBlockHeight, seenCommit.Round(), types.VoteTypePrecommit, state.LastValidators)
|
|
for _, precommit := range seenCommit.Precommits {
|
|
if precommit == nil {
|
|
continue
|
|
}
|
|
added, err := lastPrecommits.AddVote(precommit)
|
|
if !added || err != nil {
|
|
cmn.PanicCrisis(cmn.Fmt("Failed to reconstruct LastCommit: %v", err))
|
|
}
|
|
}
|
|
if !lastPrecommits.HasTwoThirdsMajority() {
|
|
cmn.PanicSanity("Failed to reconstruct LastCommit: Does not have +2/3 maj")
|
|
}
|
|
cs.LastCommit = lastPrecommits
|
|
}
|
|
|
|
// Updates ConsensusState and increments height to match that of state.
|
|
// The round becomes 0 and cs.Step becomes RoundStepNewHeight.
|
|
func (cs *ConsensusState) updateToState(state *sm.State) {
|
|
if cs.CommitRound > -1 && 0 < cs.Height && cs.Height != state.LastBlockHeight {
|
|
cmn.PanicSanity(cmn.Fmt("updateToState() expected state height of %v but found %v",
|
|
cs.Height, state.LastBlockHeight))
|
|
}
|
|
if cs.state != nil && cs.state.LastBlockHeight+1 != cs.Height {
|
|
// This might happen when someone else is mutating cs.state.
|
|
// Someone forgot to pass in state.Copy() somewhere?!
|
|
cmn.PanicSanity(cmn.Fmt("Inconsistent cs.state.LastBlockHeight+1 %v vs cs.Height %v",
|
|
cs.state.LastBlockHeight+1, cs.Height))
|
|
}
|
|
|
|
// If state isn't further out than cs.state, just ignore.
|
|
// This happens when SwitchToConsensus() is called in the reactor.
|
|
// We don't want to reset e.g. the Votes.
|
|
if cs.state != nil && (state.LastBlockHeight <= cs.state.LastBlockHeight) {
|
|
cs.Logger.Info("Ignoring updateToState()", "newHeight", state.LastBlockHeight+1, "oldHeight", cs.state.LastBlockHeight+1)
|
|
return
|
|
}
|
|
|
|
// Reset fields based on state.
|
|
validators := state.Validators
|
|
lastPrecommits := (*types.VoteSet)(nil)
|
|
if cs.CommitRound > -1 && cs.Votes != nil {
|
|
if !cs.Votes.Precommits(cs.CommitRound).HasTwoThirdsMajority() {
|
|
cmn.PanicSanity("updateToState(state) called but last Precommit round didn't have +2/3")
|
|
}
|
|
lastPrecommits = cs.Votes.Precommits(cs.CommitRound)
|
|
}
|
|
|
|
// Next desired block height
|
|
height := state.LastBlockHeight + 1
|
|
|
|
// RoundState fields
|
|
cs.updateHeight(height)
|
|
cs.updateRoundStep(0, RoundStepNewHeight)
|
|
if cs.CommitTime.IsZero() {
|
|
// "Now" makes it easier to sync up dev nodes.
|
|
// We add timeoutCommit to allow transactions
|
|
// to be gathered for the first block.
|
|
// And alternative solution that relies on clocks:
|
|
// cs.StartTime = state.LastBlockTime.Add(timeoutCommit)
|
|
cs.StartTime = cs.config.Commit(time.Now())
|
|
} else {
|
|
cs.StartTime = cs.config.Commit(cs.CommitTime)
|
|
}
|
|
cs.Validators = validators
|
|
cs.Proposal = nil
|
|
cs.ProposalBlock = nil
|
|
cs.ProposalBlockParts = nil
|
|
cs.LockedRound = 0
|
|
cs.LockedBlock = nil
|
|
cs.LockedBlockParts = nil
|
|
cs.Votes = NewHeightVoteSet(state.ChainID, height, validators)
|
|
cs.CommitRound = -1
|
|
cs.LastCommit = lastPrecommits
|
|
cs.LastValidators = state.LastValidators
|
|
|
|
cs.state = state
|
|
|
|
// Finally, broadcast RoundState
|
|
cs.newStep()
|
|
}
|
|
|
|
func (cs *ConsensusState) newStep() {
|
|
rs := cs.RoundStateEvent()
|
|
cs.wal.Save(rs)
|
|
cs.nSteps += 1
|
|
// newStep is called by updateToStep in NewConsensusState before the evsw is set!
|
|
if cs.evsw != nil {
|
|
types.FireEventNewRoundStep(cs.evsw, rs)
|
|
}
|
|
}
|
|
|
|
//-----------------------------------------
|
|
// the main go routines
|
|
|
|
// receiveRoutine handles messages which may cause state transitions.
|
|
// it's argument (n) is the number of messages to process before exiting - use 0 to run forever
|
|
// It keeps the RoundState and is the only thing that updates it.
|
|
// Updates (state transitions) happen on timeouts, complete proposals, and 2/3 majorities
|
|
func (cs *ConsensusState) receiveRoutine(maxSteps int) {
|
|
for {
|
|
if maxSteps > 0 {
|
|
if cs.nSteps >= maxSteps {
|
|
cs.Logger.Info("reached max steps. exiting receive routine")
|
|
cs.nSteps = 0
|
|
return
|
|
}
|
|
}
|
|
rs := cs.RoundState
|
|
var mi msgInfo
|
|
|
|
select {
|
|
case mi = <-cs.peerMsgQueue:
|
|
cs.wal.Save(mi)
|
|
// handles proposals, block parts, votes
|
|
// may generate internal events (votes, complete proposals, 2/3 majorities)
|
|
cs.handleMsg(mi, rs)
|
|
case mi = <-cs.internalMsgQueue:
|
|
cs.wal.Save(mi)
|
|
// handles proposals, block parts, votes
|
|
cs.handleMsg(mi, rs)
|
|
case ti := <-cs.timeoutTicker.Chan(): // tockChan:
|
|
cs.wal.Save(ti)
|
|
// if the timeout is relevant to the rs
|
|
// go to the next step
|
|
cs.handleTimeout(ti, rs)
|
|
case <-cs.Quit:
|
|
|
|
// NOTE: the internalMsgQueue may have signed messages from our
|
|
// priv_val that haven't hit the WAL, but its ok because
|
|
// priv_val tracks LastSig
|
|
|
|
// close wal now that we're done writing to it
|
|
if cs.wal != nil {
|
|
cs.wal.Stop()
|
|
}
|
|
|
|
close(cs.done)
|
|
return
|
|
}
|
|
}
|
|
}
|
|
|
|
// state transitions on complete-proposal, 2/3-any, 2/3-one
|
|
func (cs *ConsensusState) handleMsg(mi msgInfo, rs RoundState) {
|
|
cs.mtx.Lock()
|
|
defer cs.mtx.Unlock()
|
|
|
|
var err error
|
|
msg, peerKey := mi.Msg, mi.PeerKey
|
|
switch msg := msg.(type) {
|
|
case *ProposalMessage:
|
|
// will not cause transition.
|
|
// once proposal is set, we can receive block parts
|
|
err = cs.setProposal(msg.Proposal)
|
|
case *BlockPartMessage:
|
|
// if the proposal is complete, we'll enterPrevote or tryFinalizeCommit
|
|
_, err = cs.addProposalBlockPart(msg.Height, msg.Part, peerKey != "")
|
|
if err != nil && msg.Round != cs.Round {
|
|
err = nil
|
|
}
|
|
case *VoteMessage:
|
|
// attempt to add the vote and dupeout the validator if its a duplicate signature
|
|
// if the vote gives us a 2/3-any or 2/3-one, we transition
|
|
err := cs.tryAddVote(msg.Vote, peerKey)
|
|
if err == ErrAddingVote {
|
|
// TODO: punish peer
|
|
}
|
|
|
|
// NOTE: the vote is broadcast to peers by the reactor listening
|
|
// for vote events
|
|
|
|
// TODO: If rs.Height == vote.Height && rs.Round < vote.Round,
|
|
// the peer is sending us CatchupCommit precommits.
|
|
// We could make note of this and help filter in broadcastHasVoteMessage().
|
|
default:
|
|
cs.Logger.Error("Unknown msg type", reflect.TypeOf(msg))
|
|
}
|
|
if err != nil {
|
|
cs.Logger.Error("Error with msg", "type", reflect.TypeOf(msg), "peer", peerKey, "err", err, "msg", msg)
|
|
}
|
|
}
|
|
|
|
func (cs *ConsensusState) handleTimeout(ti timeoutInfo, rs RoundState) {
|
|
cs.Logger.Debug("Received tock", "timeout", ti.Duration, "height", ti.Height, "round", ti.Round, "step", ti.Step)
|
|
|
|
// timeouts must be for current height, round, step
|
|
if ti.Height != rs.Height || ti.Round < rs.Round || (ti.Round == rs.Round && ti.Step < rs.Step) {
|
|
cs.Logger.Debug("Ignoring tock because we're ahead", "height", rs.Height, "round", rs.Round, "step", rs.Step)
|
|
return
|
|
}
|
|
|
|
// the timeout will now cause a state transition
|
|
cs.mtx.Lock()
|
|
defer cs.mtx.Unlock()
|
|
|
|
switch ti.Step {
|
|
case RoundStepNewHeight:
|
|
// NewRound event fired from enterNewRound.
|
|
// XXX: should we fire timeout here (for timeout commit)?
|
|
cs.enterNewRound(ti.Height, 0)
|
|
case RoundStepPropose:
|
|
types.FireEventTimeoutPropose(cs.evsw, cs.RoundStateEvent())
|
|
cs.enterPrevote(ti.Height, ti.Round)
|
|
case RoundStepPrevoteWait:
|
|
types.FireEventTimeoutWait(cs.evsw, cs.RoundStateEvent())
|
|
cs.enterPrecommit(ti.Height, ti.Round)
|
|
case RoundStepPrecommitWait:
|
|
types.FireEventTimeoutWait(cs.evsw, cs.RoundStateEvent())
|
|
cs.enterNewRound(ti.Height, ti.Round+1)
|
|
default:
|
|
panic(cmn.Fmt("Invalid timeout step: %v", ti.Step))
|
|
}
|
|
|
|
}
|
|
|
|
//-----------------------------------------------------------------------------
|
|
// State functions
|
|
// Used internally by handleTimeout and handleMsg to make state transitions
|
|
|
|
// Enter: `timeoutNewHeight` by startTime (commitTime+timeoutCommit),
|
|
// or, if SkipTimeout==true, after receiving all precommits from (height,round-1)
|
|
// Enter: `timeoutPrecommits` after any +2/3 precommits from (height,round-1)
|
|
// Enter: +2/3 precommits for nil at (height,round-1)
|
|
// Enter: +2/3 prevotes any or +2/3 precommits for block or any from (height, round)
|
|
// NOTE: cs.StartTime was already set for height.
|
|
func (cs *ConsensusState) enterNewRound(height int, round int) {
|
|
if cs.Height != height || round < cs.Round || (cs.Round == round && cs.Step != RoundStepNewHeight) {
|
|
cs.Logger.Debug(cmn.Fmt("enterNewRound(%v/%v): Invalid args. Current step: %v/%v/%v", height, round, cs.Height, cs.Round, cs.Step))
|
|
return
|
|
}
|
|
|
|
if now := time.Now(); cs.StartTime.After(now) {
|
|
cs.Logger.Info("Need to set a buffer and log message here for sanity.", "startTime", cs.StartTime, "now", now)
|
|
}
|
|
|
|
cs.Logger.Info(cmn.Fmt("enterNewRound(%v/%v). Current: %v/%v/%v", height, round, cs.Height, cs.Round, cs.Step))
|
|
|
|
// Increment validators if necessary
|
|
validators := cs.Validators
|
|
if cs.Round < round {
|
|
validators = validators.Copy()
|
|
validators.IncrementAccum(round - cs.Round)
|
|
}
|
|
|
|
// Setup new round
|
|
// we don't fire newStep for this step,
|
|
// but we fire an event, so update the round step first
|
|
cs.updateRoundStep(round, RoundStepNewRound)
|
|
cs.Validators = validators
|
|
if round == 0 {
|
|
// We've already reset these upon new height,
|
|
// and meanwhile we might have received a proposal
|
|
// for round 0.
|
|
} else {
|
|
cs.Proposal = nil
|
|
cs.ProposalBlock = nil
|
|
cs.ProposalBlockParts = nil
|
|
}
|
|
cs.Votes.SetRound(round + 1) // also track next round (round+1) to allow round-skipping
|
|
|
|
types.FireEventNewRound(cs.evsw, cs.RoundStateEvent())
|
|
|
|
// Immediately go to enterPropose.
|
|
cs.enterPropose(height, round)
|
|
}
|
|
|
|
// Enter: from enterNewRound(height,round).
|
|
func (cs *ConsensusState) enterPropose(height int, round int) {
|
|
if cs.Height != height || round < cs.Round || (cs.Round == round && RoundStepPropose <= cs.Step) {
|
|
cs.Logger.Debug(cmn.Fmt("enterPropose(%v/%v): Invalid args. Current step: %v/%v/%v", height, round, cs.Height, cs.Round, cs.Step))
|
|
return
|
|
}
|
|
cs.Logger.Info(cmn.Fmt("enterPropose(%v/%v). Current: %v/%v/%v", height, round, cs.Height, cs.Round, cs.Step))
|
|
|
|
defer func() {
|
|
// Done enterPropose:
|
|
cs.updateRoundStep(round, RoundStepPropose)
|
|
cs.newStep()
|
|
|
|
// If we have the whole proposal + POL, then goto Prevote now.
|
|
// else, we'll enterPrevote when the rest of the proposal is received (in AddProposalBlockPart),
|
|
// or else after timeoutPropose
|
|
if cs.isProposalComplete() {
|
|
cs.enterPrevote(height, cs.Round)
|
|
}
|
|
}()
|
|
|
|
// If we don't get the proposal and all block parts quick enough, enterPrevote
|
|
cs.scheduleTimeout(cs.config.Propose(round), height, round, RoundStepPropose)
|
|
|
|
// Nothing more to do if we're not a validator
|
|
if cs.privValidator == nil {
|
|
cs.Logger.Debug("This node is not a validator")
|
|
return
|
|
}
|
|
|
|
if !bytes.Equal(cs.Validators.GetProposer().Address, cs.privValidator.GetAddress()) {
|
|
cs.Logger.Info("enterPropose: Not our turn to propose", "proposer", cs.Validators.GetProposer().Address, "privValidator", cs.privValidator)
|
|
if cs.Validators.HasAddress(cs.privValidator.GetAddress()) {
|
|
cs.Logger.Debug("This node is a validator")
|
|
} else {
|
|
cs.Logger.Debug("This node is not a validator")
|
|
}
|
|
} else {
|
|
cs.Logger.Info("enterPropose: Our turn to propose", "proposer", cs.Validators.GetProposer().Address, "privValidator", cs.privValidator)
|
|
cs.Logger.Debug("This node is a validator")
|
|
cs.decideProposal(height, round)
|
|
}
|
|
}
|
|
|
|
func (cs *ConsensusState) defaultDecideProposal(height, round int) {
|
|
var block *types.Block
|
|
var blockParts *types.PartSet
|
|
|
|
// Decide on block
|
|
if cs.LockedBlock != nil {
|
|
// If we're locked onto a block, just choose that.
|
|
block, blockParts = cs.LockedBlock, cs.LockedBlockParts
|
|
} else {
|
|
// Create a new proposal block from state/txs from the mempool.
|
|
block, blockParts = cs.createProposalBlock()
|
|
if block == nil { // on error
|
|
return
|
|
}
|
|
}
|
|
|
|
// Make proposal
|
|
polRound, polBlockID := cs.Votes.POLInfo()
|
|
proposal := types.NewProposal(height, round, blockParts.Header(), polRound, polBlockID)
|
|
err := cs.privValidator.SignProposal(cs.state.ChainID, proposal)
|
|
if err == nil {
|
|
// Set fields
|
|
/* fields set by setProposal and addBlockPart
|
|
cs.Proposal = proposal
|
|
cs.ProposalBlock = block
|
|
cs.ProposalBlockParts = blockParts
|
|
*/
|
|
|
|
// send proposal and block parts on internal msg queue
|
|
cs.sendInternalMessage(msgInfo{&ProposalMessage{proposal}, ""})
|
|
for i := 0; i < blockParts.Total(); i++ {
|
|
part := blockParts.GetPart(i)
|
|
cs.sendInternalMessage(msgInfo{&BlockPartMessage{cs.Height, cs.Round, part}, ""})
|
|
}
|
|
cs.Logger.Info("Signed proposal", "height", height, "round", round, "proposal", proposal)
|
|
cs.Logger.Debug(cmn.Fmt("Signed proposal block: %v", block))
|
|
} else {
|
|
if !cs.replayMode {
|
|
cs.Logger.Error("enterPropose: Error signing proposal", "height", height, "round", round, "err", err)
|
|
}
|
|
}
|
|
}
|
|
|
|
// Returns true if the proposal block is complete &&
|
|
// (if POLRound was proposed, we have +2/3 prevotes from there).
|
|
func (cs *ConsensusState) isProposalComplete() bool {
|
|
if cs.Proposal == nil || cs.ProposalBlock == nil {
|
|
return false
|
|
}
|
|
// we have the proposal. if there's a POLRound,
|
|
// make sure we have the prevotes from it too
|
|
if cs.Proposal.POLRound < 0 {
|
|
return true
|
|
} else {
|
|
// if this is false the proposer is lying or we haven't received the POL yet
|
|
return cs.Votes.Prevotes(cs.Proposal.POLRound).HasTwoThirdsMajority()
|
|
}
|
|
}
|
|
|
|
// Create the next block to propose and return it.
|
|
// Returns nil block upon error.
|
|
// NOTE: keep it side-effect free for clarity.
|
|
func (cs *ConsensusState) createProposalBlock() (block *types.Block, blockParts *types.PartSet) {
|
|
var commit *types.Commit
|
|
if cs.Height == 1 {
|
|
// We're creating a proposal for the first block.
|
|
// The commit is empty, but not nil.
|
|
commit = &types.Commit{}
|
|
} else if cs.LastCommit.HasTwoThirdsMajority() {
|
|
// Make the commit from LastCommit
|
|
commit = cs.LastCommit.MakeCommit()
|
|
} else {
|
|
// This shouldn't happen.
|
|
cs.Logger.Error("enterPropose: Cannot propose anything: No commit for the previous block.")
|
|
return
|
|
}
|
|
|
|
// Mempool validated transactions
|
|
txs := cs.mempool.Reap(cs.config.MaxBlockSizeTxs)
|
|
|
|
return types.MakeBlock(cs.Height, cs.state.ChainID, txs, commit,
|
|
cs.state.LastBlockID, cs.state.Validators.Hash(), cs.state.AppHash, cs.config.BlockPartSize)
|
|
}
|
|
|
|
// Enter: `timeoutPropose` after entering Propose.
|
|
// Enter: proposal block and POL is ready.
|
|
// Enter: any +2/3 prevotes for future round.
|
|
// Prevote for LockedBlock if we're locked, or ProposalBlock if valid.
|
|
// Otherwise vote nil.
|
|
func (cs *ConsensusState) enterPrevote(height int, round int) {
|
|
if cs.Height != height || round < cs.Round || (cs.Round == round && RoundStepPrevote <= cs.Step) {
|
|
cs.Logger.Debug(cmn.Fmt("enterPrevote(%v/%v): Invalid args. Current step: %v/%v/%v", height, round, cs.Height, cs.Round, cs.Step))
|
|
return
|
|
}
|
|
|
|
defer func() {
|
|
// Done enterPrevote:
|
|
cs.updateRoundStep(round, RoundStepPrevote)
|
|
cs.newStep()
|
|
}()
|
|
|
|
// fire event for how we got here
|
|
if cs.isProposalComplete() {
|
|
types.FireEventCompleteProposal(cs.evsw, cs.RoundStateEvent())
|
|
} else {
|
|
// we received +2/3 prevotes for a future round
|
|
// TODO: catchup event?
|
|
}
|
|
|
|
cs.Logger.Info(cmn.Fmt("enterPrevote(%v/%v). Current: %v/%v/%v", height, round, cs.Height, cs.Round, cs.Step))
|
|
|
|
// Sign and broadcast vote as necessary
|
|
cs.doPrevote(height, round)
|
|
|
|
// Once `addVote` hits any +2/3 prevotes, we will go to PrevoteWait
|
|
// (so we have more time to try and collect +2/3 prevotes for a single block)
|
|
}
|
|
|
|
func (cs *ConsensusState) defaultDoPrevote(height int, round int) {
|
|
logger := cs.Logger.With("height", height, "round", round)
|
|
// If a block is locked, prevote that.
|
|
if cs.LockedBlock != nil {
|
|
logger.Info("enterPrevote: Block was locked")
|
|
cs.signAddVote(types.VoteTypePrevote, cs.LockedBlock.Hash(), cs.LockedBlockParts.Header())
|
|
return
|
|
}
|
|
|
|
// If ProposalBlock is nil, prevote nil.
|
|
if cs.ProposalBlock == nil {
|
|
logger.Info("enterPrevote: ProposalBlock is nil")
|
|
cs.signAddVote(types.VoteTypePrevote, nil, types.PartSetHeader{})
|
|
return
|
|
}
|
|
|
|
// Validate proposal block
|
|
err := cs.state.ValidateBlock(cs.ProposalBlock)
|
|
if err != nil {
|
|
// ProposalBlock is invalid, prevote nil.
|
|
logger.Error("enterPrevote: ProposalBlock is invalid", "err", err)
|
|
cs.signAddVote(types.VoteTypePrevote, nil, types.PartSetHeader{})
|
|
return
|
|
}
|
|
|
|
// Prevote cs.ProposalBlock
|
|
// NOTE: the proposal signature is validated when it is received,
|
|
// and the proposal block parts are validated as they are received (against the merkle hash in the proposal)
|
|
logger.Info("enterPrevote: ProposalBlock is valid")
|
|
cs.signAddVote(types.VoteTypePrevote, cs.ProposalBlock.Hash(), cs.ProposalBlockParts.Header())
|
|
}
|
|
|
|
// Enter: any +2/3 prevotes at next round.
|
|
func (cs *ConsensusState) enterPrevoteWait(height int, round int) {
|
|
if cs.Height != height || round < cs.Round || (cs.Round == round && RoundStepPrevoteWait <= cs.Step) {
|
|
cs.Logger.Debug(cmn.Fmt("enterPrevoteWait(%v/%v): Invalid args. Current step: %v/%v/%v", height, round, cs.Height, cs.Round, cs.Step))
|
|
return
|
|
}
|
|
if !cs.Votes.Prevotes(round).HasTwoThirdsAny() {
|
|
cmn.PanicSanity(cmn.Fmt("enterPrevoteWait(%v/%v), but Prevotes does not have any +2/3 votes", height, round))
|
|
}
|
|
cs.Logger.Info(cmn.Fmt("enterPrevoteWait(%v/%v). Current: %v/%v/%v", height, round, cs.Height, cs.Round, cs.Step))
|
|
|
|
defer func() {
|
|
// Done enterPrevoteWait:
|
|
cs.updateRoundStep(round, RoundStepPrevoteWait)
|
|
cs.newStep()
|
|
}()
|
|
|
|
// Wait for some more prevotes; enterPrecommit
|
|
cs.scheduleTimeout(cs.config.Prevote(round), height, round, RoundStepPrevoteWait)
|
|
}
|
|
|
|
// Enter: `timeoutPrevote` after any +2/3 prevotes.
|
|
// Enter: +2/3 precomits for block or nil.
|
|
// Enter: any +2/3 precommits for next round.
|
|
// Lock & precommit the ProposalBlock if we have enough prevotes for it (a POL in this round)
|
|
// else, unlock an existing lock and precommit nil if +2/3 of prevotes were nil,
|
|
// else, precommit nil otherwise.
|
|
func (cs *ConsensusState) enterPrecommit(height int, round int) {
|
|
if cs.Height != height || round < cs.Round || (cs.Round == round && RoundStepPrecommit <= cs.Step) {
|
|
cs.Logger.Debug(cmn.Fmt("enterPrecommit(%v/%v): Invalid args. Current step: %v/%v/%v", height, round, cs.Height, cs.Round, cs.Step))
|
|
return
|
|
}
|
|
|
|
cs.Logger.Info(cmn.Fmt("enterPrecommit(%v/%v). Current: %v/%v/%v", height, round, cs.Height, cs.Round, cs.Step))
|
|
|
|
defer func() {
|
|
// Done enterPrecommit:
|
|
cs.updateRoundStep(round, RoundStepPrecommit)
|
|
cs.newStep()
|
|
}()
|
|
|
|
blockID, ok := cs.Votes.Prevotes(round).TwoThirdsMajority()
|
|
|
|
// If we don't have a polka, we must precommit nil
|
|
if !ok {
|
|
if cs.LockedBlock != nil {
|
|
cs.Logger.Info("enterPrecommit: No +2/3 prevotes during enterPrecommit while we're locked. Precommitting nil")
|
|
} else {
|
|
cs.Logger.Info("enterPrecommit: No +2/3 prevotes during enterPrecommit. Precommitting nil.")
|
|
}
|
|
cs.signAddVote(types.VoteTypePrecommit, nil, types.PartSetHeader{})
|
|
return
|
|
}
|
|
|
|
// At this point +2/3 prevoted for a particular block or nil
|
|
types.FireEventPolka(cs.evsw, cs.RoundStateEvent())
|
|
|
|
// the latest POLRound should be this round
|
|
polRound, _ := cs.Votes.POLInfo()
|
|
if polRound < round {
|
|
cmn.PanicSanity(cmn.Fmt("This POLRound should be %v but got %", round, polRound))
|
|
}
|
|
|
|
// +2/3 prevoted nil. Unlock and precommit nil.
|
|
if len(blockID.Hash) == 0 {
|
|
if cs.LockedBlock == nil {
|
|
cs.Logger.Info("enterPrecommit: +2/3 prevoted for nil.")
|
|
} else {
|
|
cs.Logger.Info("enterPrecommit: +2/3 prevoted for nil. Unlocking")
|
|
cs.LockedRound = 0
|
|
cs.LockedBlock = nil
|
|
cs.LockedBlockParts = nil
|
|
types.FireEventUnlock(cs.evsw, cs.RoundStateEvent())
|
|
}
|
|
cs.signAddVote(types.VoteTypePrecommit, nil, types.PartSetHeader{})
|
|
return
|
|
}
|
|
|
|
// At this point, +2/3 prevoted for a particular block.
|
|
|
|
// If we're already locked on that block, precommit it, and update the LockedRound
|
|
if cs.LockedBlock.HashesTo(blockID.Hash) {
|
|
cs.Logger.Info("enterPrecommit: +2/3 prevoted locked block. Relocking")
|
|
cs.LockedRound = round
|
|
types.FireEventRelock(cs.evsw, cs.RoundStateEvent())
|
|
cs.signAddVote(types.VoteTypePrecommit, blockID.Hash, blockID.PartsHeader)
|
|
return
|
|
}
|
|
|
|
// If +2/3 prevoted for proposal block, stage and precommit it
|
|
if cs.ProposalBlock.HashesTo(blockID.Hash) {
|
|
cs.Logger.Info("enterPrecommit: +2/3 prevoted proposal block. Locking", "hash", blockID.Hash)
|
|
// Validate the block.
|
|
if err := cs.state.ValidateBlock(cs.ProposalBlock); err != nil {
|
|
cmn.PanicConsensus(cmn.Fmt("enterPrecommit: +2/3 prevoted for an invalid block: %v", err))
|
|
}
|
|
cs.LockedRound = round
|
|
cs.LockedBlock = cs.ProposalBlock
|
|
cs.LockedBlockParts = cs.ProposalBlockParts
|
|
types.FireEventLock(cs.evsw, cs.RoundStateEvent())
|
|
cs.signAddVote(types.VoteTypePrecommit, blockID.Hash, blockID.PartsHeader)
|
|
return
|
|
}
|
|
|
|
// There was a polka in this round for a block we don't have.
|
|
// Fetch that block, unlock, and precommit nil.
|
|
// The +2/3 prevotes for this round is the POL for our unlock.
|
|
// TODO: In the future save the POL prevotes for justification.
|
|
cs.LockedRound = 0
|
|
cs.LockedBlock = nil
|
|
cs.LockedBlockParts = nil
|
|
if !cs.ProposalBlockParts.HasHeader(blockID.PartsHeader) {
|
|
cs.ProposalBlock = nil
|
|
cs.ProposalBlockParts = types.NewPartSetFromHeader(blockID.PartsHeader)
|
|
}
|
|
types.FireEventUnlock(cs.evsw, cs.RoundStateEvent())
|
|
cs.signAddVote(types.VoteTypePrecommit, nil, types.PartSetHeader{})
|
|
}
|
|
|
|
// Enter: any +2/3 precommits for next round.
|
|
func (cs *ConsensusState) enterPrecommitWait(height int, round int) {
|
|
if cs.Height != height || round < cs.Round || (cs.Round == round && RoundStepPrecommitWait <= cs.Step) {
|
|
cs.Logger.Debug(cmn.Fmt("enterPrecommitWait(%v/%v): Invalid args. Current step: %v/%v/%v", height, round, cs.Height, cs.Round, cs.Step))
|
|
return
|
|
}
|
|
if !cs.Votes.Precommits(round).HasTwoThirdsAny() {
|
|
cmn.PanicSanity(cmn.Fmt("enterPrecommitWait(%v/%v), but Precommits does not have any +2/3 votes", height, round))
|
|
}
|
|
cs.Logger.Info(cmn.Fmt("enterPrecommitWait(%v/%v). Current: %v/%v/%v", height, round, cs.Height, cs.Round, cs.Step))
|
|
|
|
defer func() {
|
|
// Done enterPrecommitWait:
|
|
cs.updateRoundStep(round, RoundStepPrecommitWait)
|
|
cs.newStep()
|
|
}()
|
|
|
|
// Wait for some more precommits; enterNewRound
|
|
cs.scheduleTimeout(cs.config.Precommit(round), height, round, RoundStepPrecommitWait)
|
|
|
|
}
|
|
|
|
// Enter: +2/3 precommits for block
|
|
func (cs *ConsensusState) enterCommit(height int, commitRound int) {
|
|
if cs.Height != height || RoundStepCommit <= cs.Step {
|
|
cs.Logger.Debug(cmn.Fmt("enterCommit(%v/%v): Invalid args. Current step: %v/%v/%v", height, commitRound, cs.Height, cs.Round, cs.Step))
|
|
return
|
|
}
|
|
cs.Logger.Info(cmn.Fmt("enterCommit(%v/%v). Current: %v/%v/%v", height, commitRound, cs.Height, cs.Round, cs.Step))
|
|
|
|
defer func() {
|
|
// Done enterCommit:
|
|
// keep cs.Round the same, commitRound points to the right Precommits set.
|
|
cs.updateRoundStep(cs.Round, RoundStepCommit)
|
|
cs.CommitRound = commitRound
|
|
cs.CommitTime = time.Now()
|
|
cs.newStep()
|
|
|
|
// Maybe finalize immediately.
|
|
cs.tryFinalizeCommit(height)
|
|
}()
|
|
|
|
blockID, ok := cs.Votes.Precommits(commitRound).TwoThirdsMajority()
|
|
if !ok {
|
|
cmn.PanicSanity("RunActionCommit() expects +2/3 precommits")
|
|
}
|
|
|
|
// The Locked* fields no longer matter.
|
|
// Move them over to ProposalBlock if they match the commit hash,
|
|
// otherwise they'll be cleared in updateToState.
|
|
if cs.LockedBlock.HashesTo(blockID.Hash) {
|
|
cs.ProposalBlock = cs.LockedBlock
|
|
cs.ProposalBlockParts = cs.LockedBlockParts
|
|
}
|
|
|
|
// If we don't have the block being committed, set up to get it.
|
|
if !cs.ProposalBlock.HashesTo(blockID.Hash) {
|
|
if !cs.ProposalBlockParts.HasHeader(blockID.PartsHeader) {
|
|
// We're getting the wrong block.
|
|
// Set up ProposalBlockParts and keep waiting.
|
|
cs.ProposalBlock = nil
|
|
cs.ProposalBlockParts = types.NewPartSetFromHeader(blockID.PartsHeader)
|
|
} else {
|
|
// We just need to keep waiting.
|
|
}
|
|
}
|
|
}
|
|
|
|
// If we have the block AND +2/3 commits for it, finalize.
|
|
func (cs *ConsensusState) tryFinalizeCommit(height int) {
|
|
if cs.Height != height {
|
|
cmn.PanicSanity(cmn.Fmt("tryFinalizeCommit() cs.Height: %v vs height: %v", cs.Height, height))
|
|
}
|
|
|
|
blockID, ok := cs.Votes.Precommits(cs.CommitRound).TwoThirdsMajority()
|
|
if !ok || len(blockID.Hash) == 0 {
|
|
cs.Logger.Error("Attempt to finalize failed. There was no +2/3 majority, or +2/3 was for <nil>.", "height", height)
|
|
return
|
|
}
|
|
if !cs.ProposalBlock.HashesTo(blockID.Hash) {
|
|
// TODO: this happens every time if we're not a validator (ugly logs)
|
|
// TODO: ^^ wait, why does it matter that we're a validator?
|
|
cs.Logger.Error("Attempt to finalize failed. We don't have the commit block.", "height", height, "proposal-block", cs.ProposalBlock.Hash(), "commit-block", blockID.Hash)
|
|
return
|
|
}
|
|
|
|
// go
|
|
cs.finalizeCommit(height)
|
|
}
|
|
|
|
// Increment height and goto RoundStepNewHeight
|
|
func (cs *ConsensusState) finalizeCommit(height int) {
|
|
if cs.Height != height || cs.Step != RoundStepCommit {
|
|
cs.Logger.Debug(cmn.Fmt("finalizeCommit(%v): Invalid args. Current step: %v/%v/%v", height, cs.Height, cs.Round, cs.Step))
|
|
return
|
|
}
|
|
|
|
blockID, ok := cs.Votes.Precommits(cs.CommitRound).TwoThirdsMajority()
|
|
block, blockParts := cs.ProposalBlock, cs.ProposalBlockParts
|
|
|
|
if !ok {
|
|
cmn.PanicSanity(cmn.Fmt("Cannot finalizeCommit, commit does not have two thirds majority"))
|
|
}
|
|
if !blockParts.HasHeader(blockID.PartsHeader) {
|
|
cmn.PanicSanity(cmn.Fmt("Expected ProposalBlockParts header to be commit header"))
|
|
}
|
|
if !block.HashesTo(blockID.Hash) {
|
|
cmn.PanicSanity(cmn.Fmt("Cannot finalizeCommit, ProposalBlock does not hash to commit hash"))
|
|
}
|
|
if err := cs.state.ValidateBlock(block); err != nil {
|
|
cmn.PanicConsensus(cmn.Fmt("+2/3 committed an invalid block: %v", err))
|
|
}
|
|
|
|
cs.Logger.Info(cmn.Fmt("Finalizing commit of block with %d txs", block.NumTxs),
|
|
"height", block.Height, "hash", block.Hash(), "root", block.AppHash)
|
|
cs.Logger.Info(cmn.Fmt("%v", block))
|
|
|
|
fail.Fail() // XXX
|
|
|
|
// Save to blockStore.
|
|
if cs.blockStore.Height() < block.Height {
|
|
// NOTE: the seenCommit is local justification to commit this block,
|
|
// but may differ from the LastCommit included in the next block
|
|
precommits := cs.Votes.Precommits(cs.CommitRound)
|
|
seenCommit := precommits.MakeCommit()
|
|
cs.blockStore.SaveBlock(block, blockParts, seenCommit)
|
|
} else {
|
|
// Happens during replay if we already saved the block but didn't commit
|
|
cs.Logger.Info("Calling finalizeCommit on already stored block", "height", block.Height)
|
|
}
|
|
|
|
fail.Fail() // XXX
|
|
|
|
// Finish writing to the WAL for this height.
|
|
// NOTE: If we fail before writing this, we'll never write it,
|
|
// and just recover by running ApplyBlock in the Handshake.
|
|
// If we moved it before persisting the block, we'd have to allow
|
|
// WAL replay for blocks with an #ENDHEIGHT
|
|
// As is, ConsensusState should not be started again
|
|
// until we successfully call ApplyBlock (ie. here or in Handshake after restart)
|
|
if cs.wal != nil {
|
|
cs.wal.writeEndHeight(height)
|
|
}
|
|
|
|
fail.Fail() // XXX
|
|
|
|
// Create a copy of the state for staging
|
|
// and an event cache for txs
|
|
stateCopy := cs.state.Copy()
|
|
eventCache := types.NewEventCache(cs.evsw)
|
|
|
|
// Execute and commit the block, update and save the state, and update the mempool.
|
|
// All calls to the proxyAppConn come here.
|
|
// NOTE: the block.AppHash wont reflect these txs until the next block
|
|
err := stateCopy.ApplyBlock(eventCache, cs.proxyAppConn, block, blockParts.Header(), cs.mempool)
|
|
if err != nil {
|
|
cs.Logger.Error("Error on ApplyBlock. Did the application crash? Please restart tendermint", "err", err)
|
|
return
|
|
}
|
|
|
|
fail.Fail() // XXX
|
|
|
|
// Fire event for new block.
|
|
// NOTE: If we fail before firing, these events will never fire
|
|
//
|
|
// TODO: Either
|
|
// * Fire before persisting state, in ApplyBlock
|
|
// * Fire on start up if we haven't written any new WAL msgs
|
|
// Both options mean we may fire more than once. Is that fine ?
|
|
types.FireEventNewBlock(cs.evsw, types.EventDataNewBlock{block})
|
|
types.FireEventNewBlockHeader(cs.evsw, types.EventDataNewBlockHeader{block.Header})
|
|
eventCache.Flush()
|
|
|
|
fail.Fail() // XXX
|
|
|
|
// NewHeightStep!
|
|
cs.updateToState(stateCopy)
|
|
|
|
fail.Fail() // XXX
|
|
|
|
// cs.StartTime is already set.
|
|
// Schedule Round0 to start soon.
|
|
cs.scheduleRound0(&cs.RoundState)
|
|
|
|
// By here,
|
|
// * cs.Height has been increment to height+1
|
|
// * cs.Step is now RoundStepNewHeight
|
|
// * cs.StartTime is set to when we will start round0.
|
|
}
|
|
|
|
//-----------------------------------------------------------------------------
|
|
|
|
func (cs *ConsensusState) defaultSetProposal(proposal *types.Proposal) error {
|
|
// Already have one
|
|
// TODO: possibly catch double proposals
|
|
if cs.Proposal != nil {
|
|
return nil
|
|
}
|
|
|
|
// Does not apply
|
|
if proposal.Height != cs.Height || proposal.Round != cs.Round {
|
|
return nil
|
|
}
|
|
|
|
// We don't care about the proposal if we're already in RoundStepCommit.
|
|
if RoundStepCommit <= cs.Step {
|
|
return nil
|
|
}
|
|
|
|
// Verify POLRound, which must be -1 or between 0 and proposal.Round exclusive.
|
|
if proposal.POLRound != -1 &&
|
|
(proposal.POLRound < 0 || proposal.Round <= proposal.POLRound) {
|
|
return ErrInvalidProposalPOLRound
|
|
}
|
|
|
|
// Verify signature
|
|
if !cs.Validators.GetProposer().PubKey.VerifyBytes(types.SignBytes(cs.state.ChainID, proposal), proposal.Signature) {
|
|
return ErrInvalidProposalSignature
|
|
}
|
|
|
|
cs.Proposal = proposal
|
|
cs.ProposalBlockParts = types.NewPartSetFromHeader(proposal.BlockPartsHeader)
|
|
return nil
|
|
}
|
|
|
|
// NOTE: block is not necessarily valid.
|
|
// Asynchronously triggers either enterPrevote (before we timeout of propose) or tryFinalizeCommit, once we have the full block.
|
|
func (cs *ConsensusState) addProposalBlockPart(height int, part *types.Part, verify bool) (added bool, err error) {
|
|
// Blocks might be reused, so round mismatch is OK
|
|
if cs.Height != height {
|
|
return false, nil
|
|
}
|
|
|
|
// We're not expecting a block part.
|
|
if cs.ProposalBlockParts == nil {
|
|
return false, nil // TODO: bad peer? Return error?
|
|
}
|
|
|
|
added, err = cs.ProposalBlockParts.AddPart(part, verify)
|
|
if err != nil {
|
|
return added, err
|
|
}
|
|
if added && cs.ProposalBlockParts.IsComplete() {
|
|
// Added and completed!
|
|
var n int
|
|
var err error
|
|
cs.ProposalBlock = wire.ReadBinary(&types.Block{}, cs.ProposalBlockParts.GetReader(), types.MaxBlockSize, &n, &err).(*types.Block)
|
|
// NOTE: it's possible to receive complete proposal blocks for future rounds without having the proposal
|
|
cs.Logger.Info("Received complete proposal block", "height", cs.ProposalBlock.Height, "hash", cs.ProposalBlock.Hash())
|
|
if cs.Step == RoundStepPropose && cs.isProposalComplete() {
|
|
// Move onto the next step
|
|
cs.enterPrevote(height, cs.Round)
|
|
} else if cs.Step == RoundStepCommit {
|
|
// If we're waiting on the proposal block...
|
|
cs.tryFinalizeCommit(height)
|
|
}
|
|
return true, err
|
|
}
|
|
return added, nil
|
|
}
|
|
|
|
// Attempt to add the vote. if its a duplicate signature, dupeout the validator
|
|
func (cs *ConsensusState) tryAddVote(vote *types.Vote, peerKey string) error {
|
|
_, err := cs.addVote(vote, peerKey)
|
|
if err != nil {
|
|
// If the vote height is off, we'll just ignore it,
|
|
// But if it's a conflicting sig, broadcast evidence tx for slashing.
|
|
// If it's otherwise invalid, punish peer.
|
|
if err == ErrVoteHeightMismatch {
|
|
return err
|
|
} else if _, ok := err.(*types.ErrVoteConflictingVotes); ok {
|
|
if bytes.Equal(vote.ValidatorAddress, cs.privValidator.GetAddress()) {
|
|
cs.Logger.Error("Found conflicting vote from ourselves. Did you unsafe_reset a validator?", "height", vote.Height, "round", vote.Round, "type", vote.Type)
|
|
return err
|
|
}
|
|
cs.Logger.Error("Found conflicting vote. Publish evidence (TODO)", "height", vote.Height, "round", vote.Round, "type", vote.Type, "valAddr", vote.ValidatorAddress, "valIndex", vote.ValidatorIndex)
|
|
|
|
// TODO: track evidence for inclusion in a block
|
|
|
|
return err
|
|
} else {
|
|
// Probably an invalid signature. Bad peer.
|
|
cs.Logger.Error("Error attempting to add vote", "err", err)
|
|
return ErrAddingVote
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
//-----------------------------------------------------------------------------
|
|
|
|
func (cs *ConsensusState) addVote(vote *types.Vote, peerKey string) (added bool, err error) {
|
|
cs.Logger.Debug("addVote", "voteHeight", vote.Height, "voteType", vote.Type, "valIndex", vote.ValidatorIndex, "csHeight", cs.Height)
|
|
|
|
// A precommit for the previous height?
|
|
// These come in while we wait timeoutCommit
|
|
if vote.Height+1 == cs.Height {
|
|
if !(cs.Step == RoundStepNewHeight && vote.Type == types.VoteTypePrecommit) {
|
|
// TODO: give the reason ..
|
|
// fmt.Errorf("tryAddVote: Wrong height, not a LastCommit straggler commit.")
|
|
return added, ErrVoteHeightMismatch
|
|
}
|
|
added, err = cs.LastCommit.AddVote(vote)
|
|
if added {
|
|
cs.Logger.Info(cmn.Fmt("Added to lastPrecommits: %v", cs.LastCommit.StringShort()))
|
|
types.FireEventVote(cs.evsw, types.EventDataVote{vote})
|
|
|
|
// if we can skip timeoutCommit and have all the votes now,
|
|
if cs.config.SkipTimeoutCommit && cs.LastCommit.HasAll() {
|
|
// go straight to new round (skip timeout commit)
|
|
// cs.scheduleTimeout(time.Duration(0), cs.Height, 0, RoundStepNewHeight)
|
|
cs.enterNewRound(cs.Height, 0)
|
|
}
|
|
}
|
|
|
|
return
|
|
}
|
|
|
|
// A prevote/precommit for this height?
|
|
if vote.Height == cs.Height {
|
|
height := cs.Height
|
|
added, err = cs.Votes.AddVote(vote, peerKey)
|
|
if added {
|
|
types.FireEventVote(cs.evsw, types.EventDataVote{vote})
|
|
|
|
switch vote.Type {
|
|
case types.VoteTypePrevote:
|
|
prevotes := cs.Votes.Prevotes(vote.Round)
|
|
cs.Logger.Info("Added to prevote", "vote", vote, "prevotes", prevotes.StringShort())
|
|
// First, unlock if prevotes is a valid POL.
|
|
// >> lockRound < POLRound <= unlockOrChangeLockRound (see spec)
|
|
// NOTE: If (lockRound < POLRound) but !(POLRound <= unlockOrChangeLockRound),
|
|
// we'll still enterNewRound(H,vote.R) and enterPrecommit(H,vote.R) to process it
|
|
// there.
|
|
if (cs.LockedBlock != nil) && (cs.LockedRound < vote.Round) && (vote.Round <= cs.Round) {
|
|
blockID, ok := prevotes.TwoThirdsMajority()
|
|
if ok && !cs.LockedBlock.HashesTo(blockID.Hash) {
|
|
cs.Logger.Info("Unlocking because of POL.", "lockedRound", cs.LockedRound, "POLRound", vote.Round)
|
|
cs.LockedRound = 0
|
|
cs.LockedBlock = nil
|
|
cs.LockedBlockParts = nil
|
|
types.FireEventUnlock(cs.evsw, cs.RoundStateEvent())
|
|
}
|
|
}
|
|
if cs.Round <= vote.Round && prevotes.HasTwoThirdsAny() {
|
|
// Round-skip over to PrevoteWait or goto Precommit.
|
|
cs.enterNewRound(height, vote.Round) // if the vote is ahead of us
|
|
if prevotes.HasTwoThirdsMajority() {
|
|
cs.enterPrecommit(height, vote.Round)
|
|
} else {
|
|
cs.enterPrevote(height, vote.Round) // if the vote is ahead of us
|
|
cs.enterPrevoteWait(height, vote.Round)
|
|
}
|
|
} else if cs.Proposal != nil && 0 <= cs.Proposal.POLRound && cs.Proposal.POLRound == vote.Round {
|
|
// If the proposal is now complete, enter prevote of cs.Round.
|
|
if cs.isProposalComplete() {
|
|
cs.enterPrevote(height, cs.Round)
|
|
}
|
|
}
|
|
case types.VoteTypePrecommit:
|
|
precommits := cs.Votes.Precommits(vote.Round)
|
|
cs.Logger.Info("Added to precommit", "vote", vote, "precommits", precommits.StringShort())
|
|
blockID, ok := precommits.TwoThirdsMajority()
|
|
if ok {
|
|
if len(blockID.Hash) == 0 {
|
|
cs.enterNewRound(height, vote.Round+1)
|
|
} else {
|
|
cs.enterNewRound(height, vote.Round)
|
|
cs.enterPrecommit(height, vote.Round)
|
|
cs.enterCommit(height, vote.Round)
|
|
|
|
if cs.config.SkipTimeoutCommit && precommits.HasAll() {
|
|
// if we have all the votes now,
|
|
// go straight to new round (skip timeout commit)
|
|
// cs.scheduleTimeout(time.Duration(0), cs.Height, 0, RoundStepNewHeight)
|
|
cs.enterNewRound(cs.Height, 0)
|
|
}
|
|
|
|
}
|
|
} else if cs.Round <= vote.Round && precommits.HasTwoThirdsAny() {
|
|
cs.enterNewRound(height, vote.Round)
|
|
cs.enterPrecommit(height, vote.Round)
|
|
cs.enterPrecommitWait(height, vote.Round)
|
|
}
|
|
default:
|
|
cmn.PanicSanity(cmn.Fmt("Unexpected vote type %X", vote.Type)) // Should not happen.
|
|
}
|
|
}
|
|
// Either duplicate, or error upon cs.Votes.AddByIndex()
|
|
return
|
|
} else {
|
|
err = ErrVoteHeightMismatch
|
|
}
|
|
|
|
// Height mismatch, bad peer?
|
|
cs.Logger.Info("Vote ignored and not added", "voteHeight", vote.Height, "csHeight", cs.Height, "err", err)
|
|
return
|
|
}
|
|
|
|
func (cs *ConsensusState) signVote(type_ byte, hash []byte, header types.PartSetHeader) (*types.Vote, error) {
|
|
addr := cs.privValidator.GetAddress()
|
|
valIndex, _ := cs.Validators.GetByAddress(addr)
|
|
vote := &types.Vote{
|
|
ValidatorAddress: addr,
|
|
ValidatorIndex: valIndex,
|
|
Height: cs.Height,
|
|
Round: cs.Round,
|
|
Type: type_,
|
|
BlockID: types.BlockID{hash, header},
|
|
}
|
|
err := cs.privValidator.SignVote(cs.state.ChainID, vote)
|
|
return vote, err
|
|
}
|
|
|
|
// sign the vote and publish on internalMsgQueue
|
|
func (cs *ConsensusState) signAddVote(type_ byte, hash []byte, header types.PartSetHeader) *types.Vote {
|
|
// if we don't have a key or we're not in the validator set, do nothing
|
|
if cs.privValidator == nil || !cs.Validators.HasAddress(cs.privValidator.GetAddress()) {
|
|
return nil
|
|
}
|
|
vote, err := cs.signVote(type_, hash, header)
|
|
if err == nil {
|
|
cs.sendInternalMessage(msgInfo{&VoteMessage{vote}, ""})
|
|
cs.Logger.Info("Signed and pushed vote", "height", cs.Height, "round", cs.Round, "vote", vote, "err", err)
|
|
return vote
|
|
} else {
|
|
//if !cs.replayMode {
|
|
cs.Logger.Error("Error signing vote", "height", cs.Height, "round", cs.Round, "vote", vote, "err", err)
|
|
//}
|
|
return nil
|
|
}
|
|
}
|
|
|
|
//---------------------------------------------------------
|
|
|
|
func CompareHRS(h1, r1 int, s1 RoundStepType, h2, r2 int, s2 RoundStepType) int {
|
|
if h1 < h2 {
|
|
return -1
|
|
} else if h1 > h2 {
|
|
return 1
|
|
}
|
|
if r1 < r2 {
|
|
return -1
|
|
} else if r1 > r2 {
|
|
return 1
|
|
}
|
|
if s1 < s2 {
|
|
return -1
|
|
} else if s1 > s2 {
|
|
return 1
|
|
}
|
|
return 0
|
|
}
|