package types import ( "errors" "fmt" "time" tmbytes "github.com/tendermint/tendermint/libs/bytes" "github.com/tendermint/tendermint/libs/protoio" tmproto "github.com/tendermint/tendermint/proto/tendermint/types" 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 tmproto.SignedMsgType Height int64 `json:"height"` Round int32 `json:"round"` // there can not be greater than 2_147_483_647 rounds POLRound int32 `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 int32, polRound int32, blockID BlockID) *Proposal { return &Proposal{ Type: tmproto.ProposalType, Height: height, Round: round, BlockID: blockID, POLRound: polRound, Timestamp: tmtime.Now(), } } // ValidateBasic performs basic validation. func (p *Proposal) ValidateBasic() error { if p.Type != tmproto.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, tmbytes.Fingerprint(p.Signature), CanonicalTime(p.Timestamp)) } // ProposalSignBytes returns the proto-encoding of the canonicalized Proposal, // for signing. // // Panics if the marshaling fails. // // See CanonicalizeProposal func ProposalSignBytes(chainID string, p *tmproto.Proposal) []byte { pb := CanonicalizeProposal(chainID, p) bz, err := protoio.MarshalDelimited(&pb) if err != nil { panic(err) } return bz } // ToProto converts Proposal to protobuf func (p *Proposal) ToProto() *tmproto.Proposal { if p == nil { return &tmproto.Proposal{} } pb := new(tmproto.Proposal) pb.BlockID = p.BlockID.ToProto() pb.Type = p.Type pb.Height = p.Height pb.Round = p.Round pb.PolRound = p.POLRound pb.Timestamp = p.Timestamp pb.Signature = p.Signature return pb } // FromProto sets a protobuf Proposal to the given pointer. // It returns an error if the proposal is invalid. func ProposalFromProto(pp *tmproto.Proposal) (*Proposal, error) { if pp == nil { return nil, errors.New("nil proposal") } p := new(Proposal) blockID, err := BlockIDFromProto(&pp.BlockID) if err != nil { return nil, err } p.BlockID = *blockID p.Type = pp.Type p.Height = pp.Height p.Round = pp.Round p.POLRound = pp.PolRound p.Timestamp = pp.Timestamp p.Signature = pp.Signature return p, p.ValidateBasic() }