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1328 lines
48 KiB
1328 lines
48 KiB
/*
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* Terms:
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NewHeight, NewRound, Propose, Prevote, Precommit represent state machine steps. (aka RoundStep).
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To "prevote/precommit" something means to broadcast a prevote/precommit vote for something.
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(H,R) means a particular height H and round R. A vote "at (H,R)" is a vote signed with (H,R).
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* Proposals:
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A proposal is signed and published by the designated proposer at each round.
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A proposal at (H,R) is composed of a proposed block of height H, and optionally a POL round number.
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The POL round number R' (where R' < R) is set to the latest POL round known to the proposer.
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If the proposer is locked on a block, it must include a POL round for the proposal.
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* POL and Justification of votes:
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A set of +2/3 of prevotes for a particular block or <nil> at (H,R) is called a POL (proof-of-lock).
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A POL for <nil> might instead be called a proof-of-unlock, but it's better to have a single terminology for both.
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Each precommit which changes the lock at round R must be justified by a POL
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where +2/3 prevoted for some block or <nil> at some round, equal to or less than R,
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but greater than the last round at which the lock was changed.
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POL = Proof-of-Lock = +2/3 prevotes for block B (or +2/3 prevotes for <nil>) at (H,R)
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lastLockChangeRound < POLRound <= newLockChangeRound
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Without the POLRound <= newLockChangeRound condition, an unlock would be possible from a
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future condition that hasn't happened yet, so it destroys deterministic accountability.
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The point of the above inequality is to ensure that changes in the lock (locking/unlocking/lock-changing)
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are always justified by something that happened "in the past" by round numbers, so if there is a problem,
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we can deterministically figure out "when it was caused" and by who.
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If there is a blockchain halt or fork, the blame will fall on +1/3 of Byzantine voting power =
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who cannot push the blame into earlier rounds. (See lemma 4).
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* Block commits:
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The set of +2/3 of precommits at the same round for the same block is called a commit.
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A block contains the last block's commit which is comprised of +2/3 precommit votes at (H-1,R).
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While all the precommits in the commit are from the same height & round (ordered by validator index),
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some precommits may be absent (e.g. if the validator's precommit vote didn't reach the proposer in time),
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or some precommits may be for different blockhashes for the last block hash (which is fine).
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* Consensus State Machine Overview:
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During NewHeight/NewRound/Propose/Prevote/Precommit:
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* Nodes gossip the proposal block proposed by the designated proposer at round.
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* Nodes gossip prevotes/precommits at rounds [0...currentRound+1] (currentRound+1 to allow round-skipping)
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* Nodes gossip prevotes for the proposal's POL (proof-of-lock) round if proposed.
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* Nodes gossip to late nodes (lagging in height) with precommits of the commit round (aka catchup)
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Upon each state transition, the height/round/step is broadcast to neighboring peers.
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* NewRound(height:H,round:R):
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* Set up new round. --> goto Propose(H,R)
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* NOTE: Not much happens in this step. It exists for clarity.
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* Propose(height:H,round:R):
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* Upon entering Propose:
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* The designated proposer proposes a block at (H,R).
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* The Propose step ends:
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* After `timeoutPropose` after entering Propose. --> goto Prevote(H,R)
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* After receiving proposal block and all POL prevotes. --> goto Prevote(H,R)
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* After any +2/3 prevotes received at (H,R+1). --> goto Prevote(H,R+1)
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* After any +2/3 precommits received at (H,R+1). --> goto Precommit(H,R+1)
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* After +2/3 precommits received for a particular block. --> goto Commit(H)
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* Prevote(height:H,round:R):
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* Upon entering Prevote, each validator broadcasts its prevote vote.
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* If the validator is locked on a block, it prevotes that.
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* Else, if the proposed block from Propose(H,R) is good, it prevotes that.
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* Else, if the proposal is invalid or wasn't received on time, it prevotes <nil>.
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* The Prevote step ends:
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* After +2/3 prevotes for a particular block or <nil>. --> goto Precommit(H,R)
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* After `timeoutPrevote` after receiving any +2/3 prevotes. --> goto Precommit(H,R)
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* After any +2/3 prevotes received at (H,R+1). --> goto Prevote(H,R+1)
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* After any +2/3 precommits received at (H,R+1). --> goto Precommit(H,R+1)
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* After +2/3 precommits received for a particular block. --> goto Commit(H)
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* Precommit(height:H,round:R):
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* Upon entering Precommit, each validator broadcasts its precommit vote.
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* If the validator had seen +2/3 of prevotes for a particular block from Prevote(H,R),
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it locks (changes lock to) that block and precommits that block.
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* Else, if the validator had seen +2/3 of prevotes for <nil>, it unlocks and precommits <nil>.
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* Else, if +2/3 of prevotes for a particular block or <nil> is not received on time,
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it precommits <nil>.
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* The Precommit step ends:
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* After +2/3 precommits for a particular block. --> goto Commit(H)
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* After +2/3 precommits for <nil>. --> goto NewRound(H,R+1)
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* After `timeoutPrecommit` after receiving any +2/3 precommits. --> goto NewRound(H,R+1)
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* After any +2/3 prevotes received at (H,R+1). --> goto Prevote(H,R+1)
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* After any +2/3 precommits received at (H,R+1). --> goto Precommit(H,R+1)
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* Commit(height:H):
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* Set CommitTime = now
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* Wait until block is received. --> goto NewHeight(H+1)
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* NewHeight(height:H):
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* Move Precommits to LastCommit and increment height.
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* Set StartTime = CommitTime+timeoutCommit
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* Wait until `StartTime` to receive straggler commits. --> goto NewRound(H,0)
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* Proof of Safety:
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If a good validator commits at round R, it's because it saw +2/3 of precommits at round R.
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This implies that (assuming tolerance bounds) +1/3 of honest nodes are still locked at round R+1.
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These locked validators will remain locked until they see +2/3 prevote for something
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else, but this won't happen because +1/3 are locked and honest.
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* Proof of Liveness:
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Lemma 1: If +1/3 good nodes are locked on two different blocks, the proposers' POLRound will
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eventually cause nodes locked from the earlier round to unlock.
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-> `timeoutProposalR` increments with round R, while the block.size && POL prevote size
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are fixed, so eventually we'll be able to "fully gossip" the block & POL.
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TODO: cap the block.size at something reasonable.
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Lemma 2: If a good node is at round R, neighboring good nodes will soon catch up to round R.
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Lemma 3: If a node at (H,R) receives +2/3 prevotes for a block (or +2/3 for <nil>) at (H,R+1),
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it will enter NewRound(H,R+1).
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Lemma 4: Terminal conditions imply the existence of deterministic accountability, for
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a synchronous (fixed-duration) protocol extension (judgement).
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TODO: define terminal conditions (fork and non-decision).
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TODO: define new assumptions for the synchronous judgement period.
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+-------------------------------------+
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v |(Wait til `CommmitTime+timeoutCommit`)
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+-----------+ +-----+-----+
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+----------> | Propose +--------------+ | NewHeight |
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| +-----------+ | +-----------+
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| | ^
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|(Else, after timeoutPrecommit) v |
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+-----+-----+ +-----------+ |
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| Precommit | <------------------------+ Prevote | |
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+-----+-----+ +-----------+ |
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|(When +2/3 Precommits for block found) |
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v |
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+--------------------------------------------------------------------+
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| Commit |
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| |
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| * Set CommitTime = now; |
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| * Wait for block, then stage/save/commit block; |
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+--------------------------------------------------------------------+
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*/
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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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"sync"
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"time"
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acm "github.com/tendermint/tendermint/account"
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bc "github.com/tendermint/tendermint/blockchain"
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. "github.com/tendermint/tendermint/common"
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"github.com/tendermint/tendermint/events"
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mempl "github.com/tendermint/tendermint/mempool"
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sm "github.com/tendermint/tendermint/state"
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"github.com/tendermint/tendermint/types"
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"github.com/tendermint/tendermint/wire"
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)
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var (
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timeoutPropose = 3000 * time.Millisecond // Maximum duration of RoundStepPropose
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timeoutPrevote0 = 1000 * time.Millisecond // After any +2/3 prevotes received, wait this long for stragglers.
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timeoutPrevoteDelta = 0500 * time.Millisecond // timeoutPrevoteN is timeoutPrevote0 + timeoutPrevoteDelta*N
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timeoutPrecommit0 = 1000 * time.Millisecond // After any +2/3 precommits received, wait this long for stragglers.
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timeoutPrecommitDelta = 0500 * time.Millisecond // timeoutPrecommitN is timeoutPrecommit0 + timeoutPrecommitDelta*N
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timeoutCommit = 2000 * time.Millisecond // After +2/3 commits received for committed block, wait this long for stragglers in the next height's RoundStepNewHeight.
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)
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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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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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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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// Immutable when returned from ConsensusState.GetRoundState()
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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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func (rs *RoundState) RoundStateEvent() *types.EventDataRoundState {
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return &types.EventDataRoundState{
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CurrentTime: time.Now(),
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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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StartTime: rs.StartTime,
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CommitTime: rs.CommitTime,
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Proposal: rs.Proposal,
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ProposalBlock: rs.ProposalBlock,
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LockedRound: rs.LockedRound,
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LockedBlock: rs.LockedBlock,
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POLRound: rs.Votes.POLRound(),
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}
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}
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func (rs *RoundState) String() string {
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return rs.StringIndented("")
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}
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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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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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// Tracks consensus state across block heights and rounds.
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type ConsensusState struct {
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BaseService
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blockStore *bc.BlockStore
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mempoolReactor *mempl.MempoolReactor
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privValidator *types.PrivValidator
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newStepCh chan *RoundState
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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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stagedBlock *types.Block // Cache last staged block.
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stagedState *sm.State // Cache result of staged block.
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evsw events.Fireable
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evc *events.EventCache // set in stageBlock and passed into state
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}
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func NewConsensusState(state *sm.State, blockStore *bc.BlockStore, mempoolReactor *mempl.MempoolReactor) *ConsensusState {
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cs := &ConsensusState{
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blockStore: blockStore,
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mempoolReactor: mempoolReactor,
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newStepCh: make(chan *RoundState, 10),
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}
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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.maybeRebond()
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cs.reconstructLastCommit(state)
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cs.BaseService = *NewBaseService(log, "ConsensusState", cs)
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return cs
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}
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// Reconstruct LastCommit from SeenValidation, 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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lastPrecommits := types.NewVoteSet(state.LastBlockHeight, 0, types.VoteTypePrecommit, state.LastBondedValidators)
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seenValidation := cs.blockStore.LoadSeenValidation(state.LastBlockHeight)
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for idx, precommit := range seenValidation.Precommits {
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if precommit == nil {
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continue
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}
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added, _, err := lastPrecommits.AddByIndex(idx, precommit)
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if !added || err != nil {
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PanicCrisis(Fmt("Failed to reconstruct LastCommit: %v", err))
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}
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}
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if !lastPrecommits.HasTwoThirdsMajority() {
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PanicSanity("Failed to reconstruct LastCommit: Does not have +2/3 maj")
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}
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cs.LastCommit = lastPrecommits
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}
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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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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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func (cs *ConsensusState) NewStepCh() chan *RoundState {
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return cs.newStepCh
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}
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func (cs *ConsensusState) OnStart() error {
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cs.BaseService.OnStart()
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cs.scheduleRound0(cs.Height)
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return nil
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}
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func (cs *ConsensusState) OnStop() {
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// It's asynchronous so, there's not much to stop.
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cs.BaseService.OnStop()
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}
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// EnterNewRound(height, 0) at cs.StartTime.
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func (cs *ConsensusState) scheduleRound0(height int) {
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//log.Info("scheduleRound0", "now", time.Now(), "startTime", cs.StartTime)
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sleepDuration := cs.StartTime.Sub(time.Now())
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go func() {
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if 0 < sleepDuration {
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time.Sleep(sleepDuration)
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// TODO: event?
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}
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cs.EnterNewRound(height, 0, false)
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}()
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}
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// Updates ConsensusState and increments height to match that of state.
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// The round becomes 0 and cs.Step becomes RoundStepNewHeight.
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func (cs *ConsensusState) updateToState(state *sm.State) {
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if cs.CommitRound > -1 && 0 < cs.Height && cs.Height != state.LastBlockHeight {
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PanicSanity(Fmt("updateToState() expected state height of %v but found %v",
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cs.Height, state.LastBlockHeight))
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}
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if cs.state != nil && cs.state.LastBlockHeight+1 != cs.Height {
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// This might happen when someone else is mutating cs.state.
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// Someone forgot to pass in state.Copy() somewhere?!
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PanicSanity(Fmt("Inconsistent cs.state.LastBlockHeight+1 %v vs cs.Height %v",
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cs.state.LastBlockHeight+1, cs.Height))
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}
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// If state isn't further out than cs.state, just ignore.
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// This happens when SwitchToConsensus() is called in the reactor.
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// We don't want to reset e.g. the Votes.
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if cs.state != nil && (state.LastBlockHeight <= cs.state.LastBlockHeight) {
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log.Notice("Ignoring updateToState()", "newHeight", state.LastBlockHeight+1, "oldHeight", cs.state.LastBlockHeight+1)
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return
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}
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// Reset fields based on state.
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validators := state.BondedValidators
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height := state.LastBlockHeight + 1 // next desired block height
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lastPrecommits := (*types.VoteSet)(nil)
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if cs.CommitRound > -1 && cs.Votes != nil {
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if !cs.Votes.Precommits(cs.CommitRound).HasTwoThirdsMajority() {
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PanicSanity("updateToState(state) called but last Precommit round didn't have +2/3")
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}
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lastPrecommits = cs.Votes.Precommits(cs.CommitRound)
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}
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// RoundState fields
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cs.Height = height
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cs.Round = 0
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cs.Step = RoundStepNewHeight
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if cs.CommitTime.IsZero() {
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// "Now" makes it easier to sync up dev nodes.
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// We add timeoutCommit to allow transactions
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// to be gathered for the first block.
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// And alternative solution that relies on clocks:
|
|
// cs.StartTime = state.LastBlockTime.Add(timeoutCommit)
|
|
cs.StartTime = time.Now().Add(timeoutCommit)
|
|
} else {
|
|
cs.StartTime = cs.CommitTime.Add(timeoutCommit)
|
|
}
|
|
cs.CommitTime = time.Time{}
|
|
cs.Validators = validators
|
|
cs.Proposal = nil
|
|
cs.ProposalBlock = nil
|
|
cs.ProposalBlockParts = nil
|
|
cs.LockedRound = 0
|
|
cs.LockedBlock = nil
|
|
cs.LockedBlockParts = nil
|
|
cs.Votes = NewHeightVoteSet(height, validators)
|
|
cs.CommitRound = -1
|
|
cs.LastCommit = lastPrecommits
|
|
cs.LastValidators = state.LastBondedValidators
|
|
|
|
cs.state = state
|
|
cs.stagedBlock = nil
|
|
cs.stagedState = nil
|
|
|
|
// Finally, broadcast RoundState
|
|
cs.newStepCh <- cs.getRoundState()
|
|
}
|
|
|
|
// If we're unbonded, broadcast RebondTx.
|
|
func (cs *ConsensusState) maybeRebond() {
|
|
if cs.privValidator == nil || !cs.state.UnbondingValidators.HasAddress(cs.privValidator.Address) {
|
|
return
|
|
}
|
|
rebondTx := &types.RebondTx{
|
|
Address: cs.privValidator.Address,
|
|
Height: cs.Height,
|
|
}
|
|
err := cs.privValidator.SignRebondTx(cs.state.ChainID, rebondTx)
|
|
if err == nil {
|
|
err := cs.mempoolReactor.BroadcastTx(rebondTx)
|
|
if err != nil {
|
|
log.Error("Failed to broadcast RebondTx",
|
|
"height", cs.Height, "round", cs.Round, "tx", rebondTx, "error", err)
|
|
} else {
|
|
log.Notice("Signed and broadcast RebondTx",
|
|
"height", cs.Height, "round", cs.Round, "tx", rebondTx)
|
|
}
|
|
} else {
|
|
log.Warn("Error signing RebondTx", "height", cs.Height, "round", cs.Round, "tx", rebondTx, "error", err)
|
|
}
|
|
}
|
|
|
|
func (cs *ConsensusState) SetPrivValidator(priv *types.PrivValidator) {
|
|
cs.mtx.Lock()
|
|
defer cs.mtx.Unlock()
|
|
cs.privValidator = priv
|
|
}
|
|
|
|
//-----------------------------------------------------------------------------
|
|
|
|
// Enter: +2/3 precommits for nil at (height,round-1)
|
|
// Enter: `timeoutPrecommits` after any +2/3 precommits from (height,round-1)
|
|
// Enter: `startTime = commitTime+timeoutCommit` from NewHeight(height)
|
|
// NOTE: cs.StartTime was already set for height.
|
|
func (cs *ConsensusState) EnterNewRound(height int, round int, timedOut bool) {
|
|
cs.mtx.Lock()
|
|
defer cs.mtx.Unlock()
|
|
if cs.Height != height || round < cs.Round || (cs.Round == round && cs.Step != RoundStepNewHeight) {
|
|
log.Debug(Fmt("EnterNewRound(%v/%v): Invalid args. Current step: %v/%v/%v", height, round, cs.Height, cs.Round, cs.Step))
|
|
return
|
|
}
|
|
|
|
if timedOut {
|
|
cs.evsw.FireEvent(types.EventStringTimeoutWait(), cs.RoundStateEvent())
|
|
}
|
|
|
|
if now := time.Now(); cs.StartTime.After(now) {
|
|
log.Warn("Need to set a buffer and log.Warn() here for sanity.", "startTime", cs.StartTime, "now", now)
|
|
}
|
|
log.Notice(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
|
|
cs.Round = round
|
|
cs.Step = 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
|
|
|
|
cs.evsw.FireEvent(types.EventStringNewRound(), cs.RoundStateEvent())
|
|
|
|
// Immediately go to EnterPropose.
|
|
go cs.EnterPropose(height, round)
|
|
}
|
|
|
|
// Enter: from NewRound(height,round).
|
|
func (cs *ConsensusState) EnterPropose(height int, round int) {
|
|
cs.mtx.Lock()
|
|
defer cs.mtx.Unlock()
|
|
if cs.Height != height || round < cs.Round || (cs.Round == round && RoundStepPropose <= cs.Step) {
|
|
log.Debug(Fmt("EnterPropose(%v/%v): Invalid args. Current step: %v/%v/%v", height, round, cs.Height, cs.Round, cs.Step))
|
|
return
|
|
}
|
|
log.Info(Fmt("EnterPropose(%v/%v). Current: %v/%v/%v", height, round, cs.Height, cs.Round, cs.Step))
|
|
|
|
defer func() {
|
|
// Done EnterPropose:
|
|
cs.Round = round
|
|
cs.Step = RoundStepPropose
|
|
cs.newStepCh <- cs.getRoundState()
|
|
|
|
// 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() {
|
|
go cs.EnterPrevote(height, cs.Round, false)
|
|
}
|
|
}()
|
|
|
|
// This step times out after `timeoutPropose`
|
|
go func() {
|
|
time.Sleep(timeoutPropose)
|
|
cs.EnterPrevote(height, round, true)
|
|
}()
|
|
|
|
// Nothing more to do if we're not a validator
|
|
if cs.privValidator == nil {
|
|
return
|
|
}
|
|
|
|
if !bytes.Equal(cs.Validators.Proposer().Address, cs.privValidator.Address) {
|
|
log.Info("EnterPropose: Not our turn to propose", "proposer", cs.Validators.Proposer().Address, "privValidator", cs.privValidator)
|
|
} else {
|
|
log.Info("EnterPropose: Our turn to propose", "proposer", cs.Validators.Proposer().Address, "privValidator", cs.privValidator)
|
|
cs.decideProposal(height, round)
|
|
}
|
|
}
|
|
|
|
// Decides on the next proposal and sets them onto cs.Proposal*
|
|
func (cs *ConsensusState) decideProposal(height int, 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()
|
|
}
|
|
|
|
// Make proposal
|
|
proposal := types.NewProposal(height, round, blockParts.Header(), cs.Votes.POLRound())
|
|
err := cs.privValidator.SignProposal(cs.state.ChainID, proposal)
|
|
if err == nil {
|
|
log.Notice("Signed and set proposal", "height", height, "round", round, "proposal", proposal)
|
|
log.Debug(Fmt("Signed and set proposal block: %v", block))
|
|
// Set fields
|
|
cs.Proposal = proposal
|
|
cs.ProposalBlock = block
|
|
cs.ProposalBlockParts = blockParts
|
|
} else {
|
|
log.Warn("EnterPropose: Error signing proposal", "height", height, "round", round, "error", 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.
|
|
// NOTE: keep it side-effect free for clarity.
|
|
func (cs *ConsensusState) createProposalBlock() (block *types.Block, blockParts *types.PartSet) {
|
|
var validation *types.Validation
|
|
if cs.Height == 1 {
|
|
// We're creating a proposal for the first block.
|
|
// The validation is empty, but not nil.
|
|
validation = &types.Validation{}
|
|
} else if cs.LastCommit.HasTwoThirdsMajority() {
|
|
// Make the validation from LastCommit
|
|
validation = cs.LastCommit.MakeValidation()
|
|
} else {
|
|
// This shouldn't happen.
|
|
log.Error("EnterPropose: Cannot propose anything: No validation for the previous block.")
|
|
return
|
|
}
|
|
txs := cs.mempoolReactor.Mempool.GetProposalTxs()
|
|
block = &types.Block{
|
|
Header: &types.Header{
|
|
ChainID: cs.state.ChainID,
|
|
Height: cs.Height,
|
|
Time: time.Now(),
|
|
Fees: 0, // TODO fees
|
|
NumTxs: len(txs),
|
|
LastBlockHash: cs.state.LastBlockHash,
|
|
LastBlockParts: cs.state.LastBlockParts,
|
|
StateHash: nil, // Will set afterwards.
|
|
},
|
|
LastValidation: validation,
|
|
Data: &types.Data{
|
|
Txs: txs,
|
|
},
|
|
}
|
|
block.FillHeader()
|
|
|
|
// Set the block.Header.StateHash.
|
|
err := cs.state.ComputeBlockStateHash(block)
|
|
if err != nil {
|
|
log.Error("EnterPropose: Error setting state hash", "error", err)
|
|
return
|
|
}
|
|
|
|
blockParts = block.MakePartSet()
|
|
return block, blockParts
|
|
}
|
|
|
|
// 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, timedOut bool) {
|
|
cs.mtx.Lock()
|
|
defer cs.mtx.Unlock()
|
|
if cs.Height != height || round < cs.Round || (cs.Round == round && RoundStepPrevote <= cs.Step) {
|
|
log.Debug(Fmt("EnterPrevote(%v/%v): Invalid args. Current step: %v/%v/%v", height, round, cs.Height, cs.Round, cs.Step))
|
|
return
|
|
}
|
|
|
|
// fire event for how we got here
|
|
if timedOut {
|
|
cs.evsw.FireEvent(types.EventStringTimeoutPropose(), cs.RoundStateEvent())
|
|
} else if cs.isProposalComplete() {
|
|
cs.evsw.FireEvent(types.EventStringCompleteProposal(), cs.RoundStateEvent())
|
|
} else {
|
|
// we received +2/3 prevotes for a future round
|
|
// TODO: catchup event?
|
|
}
|
|
|
|
log.Info(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)
|
|
|
|
// Done EnterPrevote:
|
|
cs.Round = round
|
|
cs.Step = RoundStepPrevote
|
|
cs.newStepCh <- cs.getRoundState()
|
|
|
|
// 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) doPrevote(height int, round int) {
|
|
// If a block is locked, prevote that.
|
|
if cs.LockedBlock != nil {
|
|
log.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 {
|
|
log.Warn("EnterPrevote: ProposalBlock is nil")
|
|
cs.signAddVote(types.VoteTypePrevote, nil, types.PartSetHeader{})
|
|
return
|
|
}
|
|
|
|
// Try staging cs.ProposalBlock
|
|
err := cs.stageBlock(cs.ProposalBlock, cs.ProposalBlockParts)
|
|
if err != nil {
|
|
// ProposalBlock is invalid, prevote nil.
|
|
log.Warn("EnterPrevote: ProposalBlock is invalid", "error", 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)
|
|
cs.signAddVote(types.VoteTypePrevote, cs.ProposalBlock.Hash(), cs.ProposalBlockParts.Header())
|
|
return
|
|
}
|
|
|
|
// Enter: any +2/3 prevotes at next round.
|
|
func (cs *ConsensusState) EnterPrevoteWait(height int, round int) {
|
|
cs.mtx.Lock()
|
|
defer cs.mtx.Unlock()
|
|
if cs.Height != height || round < cs.Round || (cs.Round == round && RoundStepPrevoteWait <= cs.Step) {
|
|
log.Debug(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() {
|
|
PanicSanity(Fmt("EnterPrevoteWait(%v/%v), but Prevotes does not have any +2/3 votes", height, round))
|
|
}
|
|
log.Info(Fmt("EnterPrevoteWait(%v/%v). Current: %v/%v/%v", height, round, cs.Height, cs.Round, cs.Step))
|
|
|
|
// Done EnterPrevoteWait:
|
|
cs.Round = round
|
|
cs.Step = RoundStepPrevoteWait
|
|
cs.newStepCh <- cs.getRoundState()
|
|
|
|
// After `timeoutPrevote0+timeoutPrevoteDelta*round`, EnterPrecommit()
|
|
go func() {
|
|
time.Sleep(timeoutPrevote0 + timeoutPrevoteDelta*time.Duration(round))
|
|
cs.EnterPrecommit(height, round, true)
|
|
}()
|
|
}
|
|
|
|
// Enter: +2/3 precomits for block or nil.
|
|
// Enter: `timeoutPrevote` after any +2/3 prevotes.
|
|
// 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, timedOut bool) {
|
|
cs.mtx.Lock()
|
|
defer cs.mtx.Unlock()
|
|
if cs.Height != height || round < cs.Round || (cs.Round == round && RoundStepPrecommit <= cs.Step) {
|
|
log.Debug(Fmt("EnterPrecommit(%v/%v): Invalid args. Current step: %v/%v/%v", height, round, cs.Height, cs.Round, cs.Step))
|
|
return
|
|
}
|
|
|
|
if timedOut {
|
|
cs.evsw.FireEvent(types.EventStringTimeoutWait(), cs.RoundStateEvent())
|
|
}
|
|
|
|
log.Info(Fmt("EnterPrecommit(%v/%v). Current: %v/%v/%v", height, round, cs.Height, cs.Round, cs.Step))
|
|
|
|
defer func() {
|
|
// Done EnterPrecommit:
|
|
cs.Round = round
|
|
cs.Step = RoundStepPrecommit
|
|
cs.newStepCh <- cs.getRoundState()
|
|
}()
|
|
|
|
hash, partsHeader, ok := cs.Votes.Prevotes(round).TwoThirdsMajority()
|
|
|
|
// If we don't have a polka, we must precommit nil
|
|
if !ok {
|
|
if cs.LockedBlock != nil {
|
|
log.Info("EnterPrecommit: No +2/3 prevotes during EnterPrecommit while we're locked. Precommitting nil")
|
|
} else {
|
|
log.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
|
|
cs.evsw.FireEvent(types.EventStringPolka(), cs.RoundStateEvent())
|
|
|
|
// the latest POLRound should be this round
|
|
if cs.Votes.POLRound() < round {
|
|
PanicSanity(Fmt("This POLRound should be %v but got %", round, cs.Votes.POLRound()))
|
|
}
|
|
|
|
// +2/3 prevoted nil. Unlock and precommit nil.
|
|
if len(hash) == 0 {
|
|
if cs.LockedBlock == nil {
|
|
log.Info("EnterPrecommit: +2/3 prevoted for nil.")
|
|
} else {
|
|
log.Info("EnterPrecommit: +2/3 prevoted for nil. Unlocking")
|
|
cs.LockedRound = 0
|
|
cs.LockedBlock = nil
|
|
cs.LockedBlockParts = nil
|
|
cs.evsw.FireEvent(types.EventStringUnlock(), 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(hash) {
|
|
log.Info("EnterPrecommit: +2/3 prevoted locked block. Relocking")
|
|
cs.LockedRound = round
|
|
cs.evsw.FireEvent(types.EventStringRelock(), cs.RoundStateEvent())
|
|
cs.signAddVote(types.VoteTypePrecommit, hash, partsHeader)
|
|
return
|
|
}
|
|
|
|
// If +2/3 prevoted for proposal block, stage and precommit it
|
|
if cs.ProposalBlock.HashesTo(hash) {
|
|
log.Info("EnterPrecommit: +2/3 prevoted proposal block. Locking", "hash", hash)
|
|
// Validate the block.
|
|
if err := cs.stageBlock(cs.ProposalBlock, cs.ProposalBlockParts); err != nil {
|
|
PanicConsensus(Fmt("EnterPrecommit: +2/3 prevoted for an invalid block: %v", err))
|
|
}
|
|
cs.LockedRound = round
|
|
cs.LockedBlock = cs.ProposalBlock
|
|
cs.LockedBlockParts = cs.ProposalBlockParts
|
|
cs.evsw.FireEvent(types.EventStringLock(), cs.RoundStateEvent())
|
|
cs.signAddVote(types.VoteTypePrecommit, hash, 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(partsHeader) {
|
|
cs.ProposalBlock = nil
|
|
cs.ProposalBlockParts = types.NewPartSetFromHeader(partsHeader)
|
|
}
|
|
cs.evsw.FireEvent(types.EventStringUnlock(), cs.RoundStateEvent())
|
|
cs.signAddVote(types.VoteTypePrecommit, nil, types.PartSetHeader{})
|
|
return
|
|
}
|
|
|
|
// Enter: any +2/3 precommits for next round.
|
|
func (cs *ConsensusState) EnterPrecommitWait(height int, round int) {
|
|
cs.mtx.Lock()
|
|
defer cs.mtx.Unlock()
|
|
if cs.Height != height || round < cs.Round || (cs.Round == round && RoundStepPrecommitWait <= cs.Step) {
|
|
log.Debug(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() {
|
|
PanicSanity(Fmt("EnterPrecommitWait(%v/%v), but Precommits does not have any +2/3 votes", height, round))
|
|
}
|
|
log.Info(Fmt("EnterPrecommitWait(%v/%v). Current: %v/%v/%v", height, round, cs.Height, cs.Round, cs.Step))
|
|
|
|
// Done EnterPrecommitWait:
|
|
cs.Round = round
|
|
cs.Step = RoundStepPrecommitWait
|
|
cs.newStepCh <- cs.getRoundState()
|
|
|
|
// After `timeoutPrecommit0+timeoutPrecommitDelta*round`, EnterNewRound()
|
|
go func() {
|
|
time.Sleep(timeoutPrecommit0 + timeoutPrecommitDelta*time.Duration(round))
|
|
// If we have +2/3 of precommits for a particular block (or nil),
|
|
// we already entered commit (or the next round).
|
|
// So just try to transition to the next round,
|
|
// which is what we'd do otherwise.
|
|
cs.EnterNewRound(height, round+1, true)
|
|
}()
|
|
}
|
|
|
|
// Enter: +2/3 precommits for block
|
|
func (cs *ConsensusState) EnterCommit(height int, commitRound int) {
|
|
cs.mtx.Lock()
|
|
defer cs.mtx.Unlock()
|
|
if cs.Height != height || RoundStepCommit <= cs.Step {
|
|
log.Debug(Fmt("EnterCommit(%v/%v): Invalid args. Current step: %v/%v/%v", height, commitRound, cs.Height, cs.Round, cs.Step))
|
|
return
|
|
}
|
|
log.Info(Fmt("EnterCommit(%v/%v). Current: %v/%v/%v", height, commitRound, cs.Height, cs.Round, cs.Step))
|
|
|
|
defer func() {
|
|
// Done Entercommit:
|
|
// keep ca.Round the same, it points to the right Precommits set.
|
|
cs.Step = RoundStepCommit
|
|
cs.CommitRound = commitRound
|
|
cs.newStepCh <- cs.getRoundState()
|
|
|
|
// Maybe finalize immediately.
|
|
cs.tryFinalizeCommit(height)
|
|
}()
|
|
|
|
hash, partsHeader, ok := cs.Votes.Precommits(commitRound).TwoThirdsMajority()
|
|
if !ok {
|
|
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(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(hash) {
|
|
if !cs.ProposalBlockParts.HasHeader(partsHeader) {
|
|
// We're getting the wrong block.
|
|
// Set up ProposalBlockParts and keep waiting.
|
|
cs.ProposalBlock = nil
|
|
cs.ProposalBlockParts = types.NewPartSetFromHeader(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 {
|
|
PanicSanity(Fmt("tryFinalizeCommit() cs.Height: %v vs height: %v", cs.Height, height))
|
|
}
|
|
|
|
hash, _, ok := cs.Votes.Precommits(cs.CommitRound).TwoThirdsMajority()
|
|
if !ok || len(hash) == 0 {
|
|
log.Warn("Attempt to finalize failed. There was no +2/3 majority, or +2/3 was for <nil>.")
|
|
return
|
|
}
|
|
if !cs.ProposalBlock.HashesTo(hash) {
|
|
log.Warn("Attempt to finalize failed. We don't have the commit block.")
|
|
return
|
|
}
|
|
go cs.FinalizeCommit(height)
|
|
}
|
|
|
|
// Increment height and goto RoundStepNewHeight
|
|
func (cs *ConsensusState) FinalizeCommit(height int) {
|
|
cs.mtx.Lock()
|
|
defer cs.mtx.Unlock()
|
|
|
|
if cs.Height != height || cs.Step != RoundStepCommit {
|
|
log.Debug(Fmt("FinalizeCommit(%v): Invalid args. Current step: %v/%v/%v", height, cs.Height, cs.Round, cs.Step))
|
|
return
|
|
}
|
|
|
|
hash, header, ok := cs.Votes.Precommits(cs.CommitRound).TwoThirdsMajority()
|
|
|
|
if !ok {
|
|
PanicSanity(Fmt("Cannot FinalizeCommit, commit does not have two thirds majority"))
|
|
}
|
|
if !cs.ProposalBlockParts.HasHeader(header) {
|
|
PanicSanity(Fmt("Expected ProposalBlockParts header to be commit header"))
|
|
}
|
|
if !cs.ProposalBlock.HashesTo(hash) {
|
|
PanicSanity(Fmt("Cannot FinalizeCommit, ProposalBlock does not hash to commit hash"))
|
|
}
|
|
if err := cs.stageBlock(cs.ProposalBlock, cs.ProposalBlockParts); err != nil {
|
|
PanicConsensus(Fmt("+2/3 committed an invalid block: %v", err))
|
|
}
|
|
|
|
log.Info(Fmt("Finalizing commit of block: %v", cs.ProposalBlock))
|
|
// We have the block, so stage/save/commit-vote.
|
|
cs.saveBlock(cs.ProposalBlock, cs.ProposalBlockParts, cs.Votes.Precommits(cs.CommitRound))
|
|
// Increment height.
|
|
cs.updateToState(cs.stagedState)
|
|
// cs.StartTime is already set.
|
|
// Schedule Round0 to start soon.
|
|
go cs.scheduleRound0(height + 1)
|
|
// If we're unbonded, broadcast RebondTx.
|
|
cs.maybeRebond()
|
|
|
|
// 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.
|
|
return
|
|
}
|
|
|
|
//-----------------------------------------------------------------------------
|
|
|
|
func (cs *ConsensusState) SetProposal(proposal *types.Proposal) error {
|
|
cs.mtx.Lock()
|
|
defer cs.mtx.Unlock()
|
|
|
|
// Already have one
|
|
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.Proposer().PubKey.VerifyBytes(acm.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.
|
|
// This can trigger us to go into EnterPrevote asynchronously (before we timeout of propose) or to attempt to commit
|
|
func (cs *ConsensusState) AddProposalBlockPart(height int, part *types.Part) (added bool, err error) {
|
|
cs.mtx.Lock()
|
|
defer cs.mtx.Unlock()
|
|
|
|
// 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)
|
|
if err != nil {
|
|
return added, err
|
|
}
|
|
if added && cs.ProposalBlockParts.IsComplete() {
|
|
// Added and completed!
|
|
var n int64
|
|
var err error
|
|
cs.ProposalBlock = wire.ReadBinary(&types.Block{}, cs.ProposalBlockParts.GetReader(), &n, &err).(*types.Block)
|
|
log.Info("Received complete proposal", "hash", cs.ProposalBlock.Hash())
|
|
if cs.Step == RoundStepPropose && cs.isProposalComplete() {
|
|
// Move onto the next step
|
|
go cs.EnterPrevote(height, cs.Round, false)
|
|
} 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(valIndex int, vote *types.Vote, peerKey string) (bool, error) {
|
|
added, address, err := cs.AddVote(valIndex, 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 added, err
|
|
} else if errDupe, ok := err.(*types.ErrVoteConflictingSignature); ok {
|
|
log.Warn("Found conflicting vote. Publish evidence")
|
|
evidenceTx := &types.DupeoutTx{
|
|
Address: address,
|
|
VoteA: *errDupe.VoteA,
|
|
VoteB: *errDupe.VoteB,
|
|
}
|
|
cs.mempoolReactor.BroadcastTx(evidenceTx) // shouldn't need to check returned err
|
|
return added, err
|
|
} else {
|
|
// Probably an invalid signature. Bad peer.
|
|
log.Warn("Error attempting to add vote", "error", err)
|
|
return added, ErrAddingVote
|
|
}
|
|
}
|
|
return added, nil
|
|
}
|
|
|
|
func (cs *ConsensusState) AddVote(valIndex int, vote *types.Vote, peerKey string) (added bool, address []byte, err error) {
|
|
cs.mtx.Lock()
|
|
defer cs.mtx.Unlock()
|
|
|
|
return cs.addVote(valIndex, vote, peerKey)
|
|
}
|
|
|
|
//-----------------------------------------------------------------------------
|
|
|
|
func (cs *ConsensusState) addVote(valIndex int, vote *types.Vote, peerKey string) (added bool, address []byte, err error) {
|
|
log.Debug("addVote", "voteHeight", vote.Height, "voteType", vote.Type, "csHeight", cs.Height)
|
|
|
|
defer func() {
|
|
if added {
|
|
cs.evsw.FireEvent(types.EventStringVote(), &types.EventDataVote{valIndex, address, vote})
|
|
}
|
|
}()
|
|
|
|
// A precommit for the previous height?
|
|
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, nil, ErrVoteHeightMismatch
|
|
}
|
|
added, address, err = cs.LastCommit.AddByIndex(valIndex, vote)
|
|
if added {
|
|
log.Info(Fmt("Added to lastPrecommits: %v", cs.LastCommit.StringShort()))
|
|
}
|
|
return
|
|
}
|
|
|
|
// A prevote/precommit for this height?
|
|
if vote.Height == cs.Height {
|
|
height := cs.Height
|
|
added, address, err = cs.Votes.AddByIndex(valIndex, vote, peerKey)
|
|
if added {
|
|
switch vote.Type {
|
|
case types.VoteTypePrevote:
|
|
prevotes := cs.Votes.Prevotes(vote.Round)
|
|
log.Info(Fmt("Added to prevotes: %v", 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) {
|
|
hash, _, ok := prevotes.TwoThirdsMajority()
|
|
if ok && !cs.LockedBlock.HashesTo(hash) {
|
|
log.Notice("Unlocking because of POL.", "lockedRound", cs.LockedRound, "POLRound", vote.Round)
|
|
cs.LockedRound = 0
|
|
cs.LockedBlock = nil
|
|
cs.LockedBlockParts = nil
|
|
cs.evsw.FireEvent(types.EventStringUnlock(), cs.RoundStateEvent())
|
|
}
|
|
}
|
|
if cs.Round <= vote.Round && prevotes.HasTwoThirdsAny() {
|
|
// Round-skip over to PrevoteWait or goto Precommit.
|
|
go func() {
|
|
cs.EnterNewRound(height, vote.Round, false)
|
|
if prevotes.HasTwoThirdsMajority() {
|
|
cs.EnterPrecommit(height, vote.Round, false)
|
|
} else {
|
|
cs.EnterPrevote(height, vote.Round, false)
|
|
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() {
|
|
go cs.EnterPrevote(height, cs.Round, false)
|
|
}
|
|
}
|
|
case types.VoteTypePrecommit:
|
|
precommits := cs.Votes.Precommits(vote.Round)
|
|
log.Info(Fmt("Added to precommit: %v", precommits.StringShort()))
|
|
hash, _, ok := precommits.TwoThirdsMajority()
|
|
if ok {
|
|
go func() {
|
|
if len(hash) == 0 {
|
|
cs.EnterNewRound(height, vote.Round+1, false)
|
|
} else {
|
|
cs.EnterNewRound(height, vote.Round, false)
|
|
cs.EnterPrecommit(height, vote.Round, false)
|
|
cs.EnterCommit(height, vote.Round)
|
|
}
|
|
}()
|
|
} else if cs.Round <= vote.Round && precommits.HasTwoThirdsAny() {
|
|
go func() {
|
|
cs.EnterNewRound(height, vote.Round, false)
|
|
cs.EnterPrecommit(height, vote.Round, false)
|
|
cs.EnterPrecommitWait(height, vote.Round)
|
|
}()
|
|
}
|
|
default:
|
|
PanicSanity(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?
|
|
log.Info("Vote ignored and not added", "voteHeight", vote.Height, "csHeight", cs.Height)
|
|
return
|
|
}
|
|
|
|
func (cs *ConsensusState) stageBlock(block *types.Block, blockParts *types.PartSet) error {
|
|
if block == nil {
|
|
PanicSanity("Cannot stage nil block")
|
|
}
|
|
|
|
// Already staged?
|
|
blockHash := block.Hash()
|
|
if cs.stagedBlock != nil && len(blockHash) != 0 && bytes.Equal(cs.stagedBlock.Hash(), blockHash) {
|
|
return nil
|
|
}
|
|
|
|
// Create a copy of the state for staging
|
|
stateCopy := cs.state.Copy()
|
|
// reset the event cache and pass it into the state
|
|
cs.evc = events.NewEventCache(cs.evsw)
|
|
stateCopy.SetFireable(cs.evc)
|
|
|
|
// Commit block onto the copied state.
|
|
// NOTE: Basic validation is done in state.AppendBlock().
|
|
err := sm.ExecBlock(stateCopy, block, blockParts.Header())
|
|
if err != nil {
|
|
return err
|
|
} else {
|
|
cs.stagedBlock = block
|
|
cs.stagedState = stateCopy
|
|
return nil
|
|
}
|
|
}
|
|
|
|
func (cs *ConsensusState) signVote(type_ byte, hash []byte, header types.PartSetHeader) (*types.Vote, error) {
|
|
vote := &types.Vote{
|
|
Height: cs.Height,
|
|
Round: cs.Round,
|
|
Type: type_,
|
|
BlockHash: hash,
|
|
BlockPartsHeader: header,
|
|
}
|
|
err := cs.privValidator.SignVote(cs.state.ChainID, vote)
|
|
return vote, err
|
|
}
|
|
|
|
func (cs *ConsensusState) signAddVote(type_ byte, hash []byte, header types.PartSetHeader) *types.Vote {
|
|
if cs.privValidator == nil || !cs.Validators.HasAddress(cs.privValidator.Address) {
|
|
return nil
|
|
}
|
|
vote, err := cs.signVote(type_, hash, header)
|
|
if err == nil {
|
|
// NOTE: store our index in the cs so we don't have to do this every time
|
|
valIndex, _ := cs.Validators.GetByAddress(cs.privValidator.Address)
|
|
_, _, err := cs.addVote(valIndex, vote, "")
|
|
log.Notice("Signed and added vote", "height", cs.Height, "round", cs.Round, "vote", vote, "error", err)
|
|
return vote
|
|
} else {
|
|
log.Warn("Error signing vote", "height", cs.Height, "round", cs.Round, "vote", vote, "error", err)
|
|
return nil
|
|
}
|
|
}
|
|
|
|
// Save Block, save the +2/3 Commits we've seen
|
|
func (cs *ConsensusState) saveBlock(block *types.Block, blockParts *types.PartSet, commits *types.VoteSet) {
|
|
|
|
// The proposal must be valid.
|
|
if err := cs.stageBlock(block, blockParts); err != nil {
|
|
PanicSanity(Fmt("saveBlock() an invalid block: %v", err))
|
|
}
|
|
|
|
// Save to blockStore.
|
|
if cs.blockStore.Height() < block.Height {
|
|
seenValidation := commits.MakeValidation()
|
|
cs.blockStore.SaveBlock(block, blockParts, seenValidation)
|
|
}
|
|
|
|
// Save the state.
|
|
cs.stagedState.Save()
|
|
|
|
// Update mempool.
|
|
cs.mempoolReactor.ResetForBlockAndState(block, cs.stagedState)
|
|
|
|
// Fire off event
|
|
if cs.evsw != nil && cs.evc != nil {
|
|
cs.evsw.FireEvent(types.EventStringNewBlock(), types.EventDataNewBlock{block})
|
|
go cs.evc.Flush()
|
|
}
|
|
|
|
}
|
|
|
|
// implements events.Eventable
|
|
func (cs *ConsensusState) SetFireable(evsw events.Fireable) {
|
|
cs.evsw = evsw
|
|
}
|
|
|
|
func (cs *ConsensusState) String() string {
|
|
return Fmt("ConsensusState(H:%v R:%v S:%v", cs.Height, cs.Round, cs.Step)
|
|
}
|