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372 lines
13 KiB
372 lines
13 KiB
// Package consensus implements the Cosi PBFT consensus
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package consensus // consensus
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import (
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"fmt"
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"math/big"
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"sync"
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"time"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/common/hexutil"
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"github.com/harmony-one/bls/ffi/go/bls"
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"github.com/harmony-one/harmony/contracts/structs"
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"github.com/harmony-one/harmony/core"
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"github.com/harmony-one/harmony/core/types"
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bls_cosi "github.com/harmony-one/harmony/crypto/bls"
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"github.com/harmony-one/harmony/internal/ctxerror"
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"github.com/harmony-one/harmony/internal/genesis"
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"github.com/harmony-one/harmony/internal/memprofiling"
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"github.com/harmony-one/harmony/internal/utils"
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"github.com/harmony-one/harmony/p2p"
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"github.com/harmony-one/harmony/shard"
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)
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const (
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vdFAndProofSize = 516 // size of VDF and Proof
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vdfAndSeedSize = 548 // size of VDF/Proof and Seed
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)
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// Consensus is the main struct with all states and data related to consensus process.
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type Consensus struct {
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// PbftLog stores the pbft messages and blocks during PBFT process
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PbftLog *PbftLog
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// phase: different phase of PBFT protocol: pre-prepare, prepare, commit, finish etc
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phase PbftPhase
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// mode: indicate a node is in normal or viewchanging mode
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mode PbftMode
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// epoch: current epoch number
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epoch uint64
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// blockNum: the next blockNumber that PBFT is going to agree on, should be equal to the blockNumber of next block
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blockNum uint64
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// channel to receive consensus message
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MsgChan chan []byte
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// How long to delay sending commit messages.
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delayCommit time.Duration
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// Consensus rounds whose commit phase finished
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commitFinishChan chan uint64
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// 2 types of timeouts: normal and viewchange
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consensusTimeout map[TimeoutType]*utils.Timeout
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// Commits collected from validators.
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prepareSigs map[string]*bls.Sign // key is the bls public key
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commitSigs map[string]*bls.Sign // key is the bls public key
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aggregatedPrepareSig *bls.Sign
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aggregatedCommitSig *bls.Sign
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prepareBitmap *bls_cosi.Mask
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commitBitmap *bls_cosi.Mask
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// Commits collected from view change
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bhpSigs map[string]*bls.Sign // bhpSigs: blockHashPreparedSigs is the signature on m1 type message
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nilSigs map[string]*bls.Sign // nilSigs: there is no prepared message when view change, it's signature on m2 type (i.e. nil) messages
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viewIDSigs map[string]*bls.Sign // viewIDSigs: every validator sign on |viewID|blockHash| in view changing message
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bhpBitmap *bls_cosi.Mask
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nilBitmap *bls_cosi.Mask
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viewIDBitmap *bls_cosi.Mask
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m1Payload []byte // message payload for type m1 := |vcBlockHash|prepared_agg_sigs|prepared_bitmap|, new leader only need one
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vcLock sync.Mutex // mutex for view change
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// The chain reader for the blockchain this consensus is working on
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ChainReader *core.BlockChain
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// map of nodeID to validator Peer object
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validators sync.Map // key is the hex string of the blsKey, value is p2p.Peer
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// Minimal number of peers in the shard
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// If the number of validators is less than minPeers, the consensus won't start
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MinPeers int
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// Leader's address
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leader p2p.Peer
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// Public keys of the committee including leader and validators
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PublicKeys []*bls.PublicKey
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CommitteePublicKeys map[string]bool
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pubKeyLock sync.Mutex
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// private/public keys of current node
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priKey *bls.SecretKey
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PubKey *bls.PublicKey
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SelfAddress common.Address
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// the publickey of leader
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LeaderPubKey *bls.PublicKey
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// number of publickeys of previous epoch
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numPrevPubKeys int
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viewID uint64
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// Blockhash - 32 byte
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blockHash [32]byte
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// Block to run consensus on
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block []byte
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// BlockHeader to run consensus on
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blockHeader []byte
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// Array of block hashes.
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blockHashes [][32]byte
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// Shard Id which this node belongs to
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ShardID uint32
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// whether to ignore viewID check
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ignoreViewIDCheck bool
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// global consensus mutex
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mutex sync.Mutex
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// consensus information update mutex
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infoMutex sync.Mutex
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// Signal channel for starting a new consensus process
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ReadySignal chan struct{}
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// The post-consensus processing func passed from Node object
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// Called when consensus on a new block is done
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OnConsensusDone func(*types.Block, []byte)
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// The verifier func passed from Node object
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BlockVerifier func(*types.Block) error
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// verified block to state sync broadcast
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VerifiedNewBlock chan *types.Block
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// will trigger state syncing when blockNum is low
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blockNumLowChan chan struct{}
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// Channel for DRG protocol to send pRnd (preimage of randomness resulting from combined vrf randomnesses) to consensus. The first 32 bytes are randomness, the rest is for bitmap.
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PRndChannel chan []byte
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// Channel for DRG protocol to send VDF. The first 516 bytes are the VDF/Proof and the last 32 bytes are the seed for deriving VDF
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RndChannel chan [vdfAndSeedSize]byte
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pendingRnds [][vdfAndSeedSize]byte // A list of pending randomness
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uniqueIDInstance *utils.UniqueValidatorID
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// The p2p host used to send/receive p2p messages
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host p2p.Host
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// MessageSender takes are of sending consensus message and the corresponding retry logic.
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msgSender *MessageSender
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// Staking information finder
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stakeInfoFinder StakeInfoFinder
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// Used to convey to the consensus main loop that block syncing has finished.
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syncReadyChan chan struct{}
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// Used to convey to the consensus main loop that node is out of sync
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syncNotReadyChan chan struct{}
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// If true, this consensus will not propose view change.
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disableViewChange bool
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// last node block reward for metrics
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lastBlockReward *big.Int
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}
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// SetCommitDelay sets the commit message delay. If set to non-zero,
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// validator delays commit message by the amount.
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func (consensus *Consensus) SetCommitDelay(delay time.Duration) {
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consensus.delayCommit = delay
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}
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// StakeInfoFinder returns the stake information finder instance this
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// consensus uses, e.g. for block reward distribution.
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func (consensus *Consensus) StakeInfoFinder() StakeInfoFinder {
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return consensus.stakeInfoFinder
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}
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// SetStakeInfoFinder sets the stake information finder instance this
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// consensus uses, e.g. for block reward distribution.
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func (consensus *Consensus) SetStakeInfoFinder(stakeInfoFinder StakeInfoFinder) {
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consensus.stakeInfoFinder = stakeInfoFinder
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}
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// DisableViewChangeForTestingOnly makes the receiver not propose view
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// changes when it should, e.g. leader timeout.
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//
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// As the name implies, this is intended for testing only,
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// and should not be used on production network.
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// This is also not part of the long-term consensus API and may go away later.
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func (consensus *Consensus) DisableViewChangeForTestingOnly() {
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consensus.disableViewChange = true
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}
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// BlocksSynchronized lets the main loop know that block synchronization finished
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// thus the blockchain is likely to be up to date.
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func (consensus *Consensus) BlocksSynchronized() {
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consensus.syncReadyChan <- struct{}{}
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}
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// BlocksNotSynchronized lets the main loop know that block is not synchronized
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func (consensus *Consensus) BlocksNotSynchronized() {
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consensus.syncNotReadyChan <- struct{}{}
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}
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// WaitForSyncing informs the node syncing service to start syncing
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func (consensus *Consensus) WaitForSyncing() {
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<-consensus.blockNumLowChan
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}
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// Quorum returns the consensus quorum of the current committee (2f+1).
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func (consensus *Consensus) Quorum() int {
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return len(consensus.PublicKeys)*2/3 + 1
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}
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// PreviousQuorum returns the quorum size of previous epoch
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func (consensus *Consensus) PreviousQuorum() int {
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return consensus.numPrevPubKeys*2/3 + 1
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}
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// VdfSeedSize returns the number of VRFs for VDF computation
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func (consensus *Consensus) VdfSeedSize() int {
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return len(consensus.PublicKeys) * 2 / 3
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}
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// RewardThreshold returns the threshold to stop accepting commit messages
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// when leader receives enough signatures for block reward
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func (consensus *Consensus) RewardThreshold() int {
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return len(consensus.PublicKeys) * 9 / 10
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}
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// GetBlockReward returns last node block reward
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func (consensus *Consensus) GetBlockReward() *big.Int {
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return consensus.lastBlockReward
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}
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// StakeInfoFinder finds the staking account for the given consensus key.
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type StakeInfoFinder interface {
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// FindStakeInfoByNodeKey returns a list of staking information matching
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// the given node key. Caller may modify the returned slice of StakeInfo
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// struct pointers, but must not modify the StakeInfo structs themselves.
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FindStakeInfoByNodeKey(key *bls.PublicKey) []*structs.StakeInfo
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// FindStakeInfoByAccount returns a list of staking information matching
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// the given account. Caller may modify the returned slice of StakeInfo
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// struct pointers, but must not modify the StakeInfo structs themselves.
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FindStakeInfoByAccount(addr common.Address) []*structs.StakeInfo
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}
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// New creates a new Consensus object
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// TODO: put shardId into chain reader's chain config
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func New(host p2p.Host, ShardID uint32, leader p2p.Peer, blsPriKey *bls.SecretKey) (*Consensus, error) {
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consensus := Consensus{}
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consensus.host = host
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consensus.msgSender = NewMessageSender(host)
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consensus.blockNumLowChan = make(chan struct{})
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// pbft related
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consensus.PbftLog = NewPbftLog()
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consensus.phase = Announce
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consensus.mode = PbftMode{mode: Normal}
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// pbft timeout
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consensus.consensusTimeout = createTimeout()
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consensus.prepareSigs = map[string]*bls.Sign{}
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consensus.commitSigs = map[string]*bls.Sign{}
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consensus.CommitteePublicKeys = make(map[string]bool)
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consensus.validators.Store(leader.ConsensusPubKey.SerializeToHexStr(), leader)
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if blsPriKey != nil {
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consensus.priKey = blsPriKey
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consensus.PubKey = blsPriKey.GetPublicKey()
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utils.Logger().Info().Str("publicKey", consensus.PubKey.SerializeToHexStr()).Msg("My Public Key")
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} else {
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utils.Logger().Error().Msg("the bls key is nil")
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return nil, fmt.Errorf("nil bls key, aborting")
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}
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// viewID has to be initialized as the height of the blockchain during initialization
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// as it was displayed on explorer as Height right now
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consensus.viewID = 0
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consensus.ShardID = ShardID
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consensus.MsgChan = make(chan []byte)
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consensus.syncReadyChan = make(chan struct{})
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consensus.syncNotReadyChan = make(chan struct{})
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consensus.commitFinishChan = make(chan uint64)
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consensus.ReadySignal = make(chan struct{})
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consensus.lastBlockReward = big.NewInt(0)
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// channel for receiving newly generated VDF
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consensus.RndChannel = make(chan [vdfAndSeedSize]byte)
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consensus.uniqueIDInstance = utils.GetUniqueValidatorIDInstance()
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memprofiling.GetMemProfiling().Add("consensus.pbftLog", consensus.PbftLog)
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return &consensus, nil
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}
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// GenesisStakeInfoFinder is a stake info finder implementation using only
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// genesis accounts.
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// When used for block reward, it rewards only foundational nodes.
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type GenesisStakeInfoFinder struct {
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byNodeKey map[shard.BlsPublicKey][]*structs.StakeInfo
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byAccount map[common.Address][]*structs.StakeInfo
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}
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// FindStakeInfoByNodeKey returns the genesis account matching the given node
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// key, as a single-item StakeInfo list.
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// It returns nil if the key is not a genesis node key.
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func (f *GenesisStakeInfoFinder) FindStakeInfoByNodeKey(
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key *bls.PublicKey,
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) []*structs.StakeInfo {
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var pk shard.BlsPublicKey
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if err := pk.FromLibBLSPublicKey(key); err != nil {
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utils.Logger().Warn().Err(err).Msg("cannot convert BLS public key")
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return nil
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}
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l, _ := f.byNodeKey[pk]
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return l
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}
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// FindStakeInfoByAccount returns the genesis account matching the given
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// address, as a single-item StakeInfo list.
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// It returns nil if the address is not a genesis account.
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func (f *GenesisStakeInfoFinder) FindStakeInfoByAccount(
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addr common.Address,
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) []*structs.StakeInfo {
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l, _ := f.byAccount[addr]
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return l
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}
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// NewGenesisStakeInfoFinder returns a stake info finder that can look up
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// genesis nodes.
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func NewGenesisStakeInfoFinder() (*GenesisStakeInfoFinder, error) {
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f := &GenesisStakeInfoFinder{
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byNodeKey: make(map[shard.BlsPublicKey][]*structs.StakeInfo),
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byAccount: make(map[common.Address][]*structs.StakeInfo),
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}
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for idx, account := range genesis.HarmonyAccounts {
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pub := &bls.PublicKey{}
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pub.DeserializeHexStr(account.BlsPublicKey)
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var blsPublicKey shard.BlsPublicKey
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if err := blsPublicKey.FromLibBLSPublicKey(pub); err != nil {
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return nil, ctxerror.New("cannot convert BLS public key",
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"accountIndex", idx,
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).WithCause(err)
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}
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addressBytes, err := hexutil.Decode(account.Address)
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if err != nil {
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return nil, ctxerror.New("cannot decode account address",
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"accountIndex", idx,
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).WithCause(err)
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}
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var address common.Address
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address.SetBytes(addressBytes)
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stakeInfo := &structs.StakeInfo{
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Account: address,
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BlsPublicKey: blsPublicKey,
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BlockNum: common.Big0,
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LockPeriodCount: big.NewInt(0x7fffffffffffffff),
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Amount: common.Big0,
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}
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f.byNodeKey[blsPublicKey] = append(f.byNodeKey[blsPublicKey], stakeInfo)
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f.byAccount[address] = append(f.byAccount[address], stakeInfo)
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}
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return f, nil
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}
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