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package types
import (
"errors"
"fmt"
"time"
cmn "github.com/tendermint/tendermint/libs/common"
tmtime "github.com/tendermint/tendermint/types/time"
)
var (
ErrInvalidBlockPartSignature = errors.New("error invalid block part signature")
ErrInvalidBlockPartHash = errors.New("error invalid block part hash")
)
// Proposal defines a block proposal for the consensus.
// It refers to the block by BlockID field.
// It must be signed by the correct proposer for the given Height/Round
// to be considered valid. It may depend on votes from a previous round,
// a so-called Proof-of-Lock (POL) round, as noted in the POLRound.
// If POLRound >= 0, then BlockID corresponds to the block that is locked in POLRound.
type Proposal struct {
Type SignedMsgType
Height int64 `json:"height"`
Round int `json:"round"`
POLRound int `json:"pol_round"` // -1 if null.
BlockID BlockID `json:"block_id"`
Timestamp time.Time `json:"timestamp"`
Signature []byte `json:"signature"`
}
// NewProposal returns a new Proposal.
// If there is no POLRound, polRound should be -1.
func NewProposal(height int64, round int, polRound int, blockID BlockID) *Proposal {
return &Proposal{
Type: ProposalType,
Height: height,
Round: round,
BlockID: blockID,
POLRound: polRound,
Timestamp: tmtime.Now(),
}
}
// ValidateBasic performs basic validation.
func (p *Proposal) ValidateBasic() error {
if p.Type != ProposalType {
return errors.New("invalid Type")
}
if p.Height < 0 {
return errors.New("negative Height")
}
if p.Round < 0 {
return errors.New("negative Round")
}
if p.POLRound < -1 {
return errors.New("negative POLRound (exception: -1)")
}
if err := p.BlockID.ValidateBasic(); err != nil {
return fmt.Errorf("wrong BlockID: %v", err)
}
// ValidateBasic above would pass even if the BlockID was empty:
if !p.BlockID.IsComplete() {
return fmt.Errorf("expected a complete, non-empty BlockID, got: %v", p.BlockID)
}
// NOTE: Timestamp validation is subtle and handled elsewhere.
if len(p.Signature) == 0 {
return errors.New("signature is missing")
}
if len(p.Signature) > MaxSignatureSize {
return fmt.Errorf("signature is too big (max: %d)", MaxSignatureSize)
}
return nil
}
// String returns a string representation of the Proposal.
func (p *Proposal) String() string {
return fmt.Sprintf("Proposal{%v/%v (%v, %v) %X @ %s}",
p.Height,
p.Round,
p.BlockID,
p.POLRound,
cmn.Fingerprint(p.Signature),
CanonicalTime(p.Timestamp))
}
// SignBytes returns the Proposal bytes for signing
func (p *Proposal) SignBytes(chainID string) []byte {
bz, err := cdc.MarshalBinaryLengthPrefixed(CanonicalizeProposal(chainID, p))
if err != nil {
panic(err)
}
return bz
}