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117 lines
3.3 KiB
117 lines
3.3 KiB
package consensus
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import (
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"fmt"
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"io"
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. "github.com/tendermint/tendermint/binary"
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. "github.com/tendermint/tendermint/blocks"
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. "github.com/tendermint/tendermint/common"
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"github.com/tendermint/tendermint/state"
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)
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// Proof of lock.
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// +2/3 of validators' prevotes for a given blockhash (or nil)
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type POL struct {
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Height uint32
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Round uint16
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BlockHash []byte // Could be nil, which makes this a proof of unlock.
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Votes []Signature // Vote signatures for height/round/hash
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Commits []Signature // Commit signatures for height/hash
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CommitRounds []uint16 // Rounds of the commits, less than POL.Round.
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}
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func ReadPOL(r io.Reader, n *int64, err *error) *POL {
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return &POL{
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Height: ReadUInt32(r, n, err),
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Round: ReadUInt16(r, n, err),
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BlockHash: ReadByteSlice(r, n, err),
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Votes: ReadSignatures(r, n, err),
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Commits: ReadSignatures(r, n, err),
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CommitRounds: ReadUInt16s(r, n, err),
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}
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}
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func (pol *POL) WriteTo(w io.Writer) (n int64, err error) {
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WriteUInt32(w, pol.Height, &n, &err)
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WriteUInt16(w, pol.Round, &n, &err)
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WriteByteSlice(w, pol.BlockHash, &n, &err)
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WriteSignatures(w, pol.Votes, &n, &err)
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WriteSignatures(w, pol.Commits, &n, &err)
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WriteUInt16s(w, pol.CommitRounds, &n, &err)
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return
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}
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// Returns whether +2/3 have voted/committed for BlockHash.
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func (pol *POL) Verify(vset *state.ValidatorSet) error {
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talliedVotingPower := uint64(0)
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voteDoc := BinaryBytes(&Vote{Height: pol.Height, Round: pol.Round,
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Type: VoteTypePrevote, BlockHash: pol.BlockHash})
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seenValidators := map[uint64]struct{}{}
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for _, sig := range pol.Votes {
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// Validate
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if _, seen := seenValidators[sig.SignerId]; seen {
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return Errorf("Duplicate validator for vote %v for POL %v", sig, pol)
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}
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_, val := vset.GetById(sig.SignerId)
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if val == nil {
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return Errorf("Invalid validator for vote %v for POL %v", sig, pol)
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}
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if !val.VerifyBytes(voteDoc, sig) {
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return Errorf("Invalid signature for vote %v for POL %v", sig, pol)
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}
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// Tally
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seenValidators[val.Id] = struct{}{}
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talliedVotingPower += val.VotingPower
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}
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for i, sig := range pol.Commits {
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round := pol.CommitRounds[i]
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// Validate
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if _, seen := seenValidators[sig.SignerId]; seen {
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return Errorf("Duplicate validator for commit %v for POL %v", sig, pol)
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}
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_, val := vset.GetById(sig.SignerId)
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if val == nil {
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return Errorf("Invalid validator for commit %v for POL %v", sig, pol)
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}
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if round >= pol.Round {
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return Errorf("Invalid commit round %v for POL %v", round, pol)
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}
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commitDoc := BinaryBytes(&Vote{Height: pol.Height, Round: round,
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Type: VoteTypeCommit, BlockHash: pol.BlockHash}) // TODO cache
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if !val.VerifyBytes(commitDoc, sig) {
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return Errorf("Invalid signature for commit %v for POL %v", sig, pol)
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}
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// Tally
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seenValidators[val.Id] = struct{}{}
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talliedVotingPower += val.VotingPower
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}
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if talliedVotingPower > vset.TotalVotingPower()*2/3 {
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return nil
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} else {
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return Errorf("Invalid POL, insufficient voting power %v, needed %v",
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talliedVotingPower, (vset.TotalVotingPower()*2/3 + 1))
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}
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}
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func (pol *POL) Description() string {
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if pol == nil {
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return "nil-POL"
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} else {
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blockHash := pol.BlockHash
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if blockHash != nil {
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blockHash = blockHash[:6]
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}
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return fmt.Sprintf("POL{H:%v R:%v BH:%X}", pol.Height, pol.Round, blockHash)
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}
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}
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