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221 lines
5.4 KiB
221 lines
5.4 KiB
package types
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import (
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"bytes"
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"errors"
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"fmt"
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tmproto "github.com/tendermint/tendermint/proto/tendermint/types"
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)
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// LightBlock is a SignedHeader and a ValidatorSet.
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// It is the basis of the light client
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type LightBlock struct {
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*SignedHeader `json:"signed_header"`
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ValidatorSet *ValidatorSet `json:"validator_set"`
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}
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// ValidateBasic checks that the data is correct and consistent
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//
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// This does no verification of the signatures
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func (lb LightBlock) ValidateBasic(chainID string) error {
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if lb.SignedHeader == nil {
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return errors.New("missing signed header")
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}
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if lb.ValidatorSet == nil {
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return errors.New("missing validator set")
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}
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if err := lb.SignedHeader.ValidateBasic(chainID); err != nil {
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return fmt.Errorf("invalid signed header: %w", err)
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}
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if err := lb.ValidatorSet.ValidateBasic(); err != nil {
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return fmt.Errorf("invalid validator set: %w", err)
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}
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// make sure the validator set is consistent with the header
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if valSetHash := lb.ValidatorSet.Hash(); !bytes.Equal(lb.SignedHeader.ValidatorsHash, valSetHash) {
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return fmt.Errorf("expected validator hash of header to match validator set hash (%X != %X)",
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lb.SignedHeader.ValidatorsHash, valSetHash,
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)
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}
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return nil
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}
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// String returns a string representation of the LightBlock
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func (lb LightBlock) String() string {
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return lb.StringIndented("")
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}
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// StringIndented returns an indented string representation of the LightBlock
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//
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// SignedHeader
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// ValidatorSet
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func (lb LightBlock) StringIndented(indent string) string {
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return fmt.Sprintf(`LightBlock{
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%s %v
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%s %v
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%s}`,
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indent, lb.SignedHeader.StringIndented(indent+" "),
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indent, lb.ValidatorSet.StringIndented(indent+" "),
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indent)
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}
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// ToProto converts the LightBlock to protobuf
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func (lb *LightBlock) ToProto() (*tmproto.LightBlock, error) {
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if lb == nil {
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return nil, nil
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}
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lbp := new(tmproto.LightBlock)
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var err error
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if lb.SignedHeader != nil {
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lbp.SignedHeader = lb.SignedHeader.ToProto()
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}
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if lb.ValidatorSet != nil {
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lbp.ValidatorSet, err = lb.ValidatorSet.ToProto()
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if err != nil {
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return nil, err
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}
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}
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return lbp, nil
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}
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// LightBlockFromProto converts from protobuf back into the Lightblock.
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// An error is returned if either the validator set or signed header are invalid
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func LightBlockFromProto(pb *tmproto.LightBlock) (*LightBlock, error) {
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if pb == nil {
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return nil, errors.New("nil light block")
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}
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lb := new(LightBlock)
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if pb.SignedHeader != nil {
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sh, err := SignedHeaderFromProto(pb.SignedHeader)
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if err != nil {
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return nil, err
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}
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lb.SignedHeader = sh
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}
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if pb.ValidatorSet != nil {
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vals, err := ValidatorSetFromProto(pb.ValidatorSet)
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if err != nil {
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return nil, err
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}
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lb.ValidatorSet = vals
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}
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return lb, nil
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}
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//-----------------------------------------------------------------------------
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// SignedHeader is a header along with the commits that prove it.
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type SignedHeader struct {
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*Header `json:"header"`
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Commit *Commit `json:"commit"`
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}
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// ValidateBasic does basic consistency checks and makes sure the header
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// and commit are consistent.
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//
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// NOTE: This does not actually check the cryptographic signatures. Make sure
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// to use a Verifier to validate the signatures actually provide a
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// significantly strong proof for this header's validity.
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func (sh SignedHeader) ValidateBasic(chainID string) error {
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if sh.Header == nil {
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return errors.New("missing header")
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}
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if sh.Commit == nil {
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return errors.New("missing commit")
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}
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if err := sh.Header.ValidateBasic(); err != nil {
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return fmt.Errorf("invalid header: %w", err)
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}
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if err := sh.Commit.ValidateBasic(); err != nil {
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return fmt.Errorf("invalid commit: %w", err)
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}
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if sh.ChainID != chainID {
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return fmt.Errorf("header belongs to another chain %q, not %q", sh.ChainID, chainID)
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}
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// Make sure the header is consistent with the commit.
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if sh.Commit.Height != sh.Height {
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return fmt.Errorf("header and commit height mismatch: %d vs %d", sh.Height, sh.Commit.Height)
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}
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if hhash, chash := sh.Header.Hash(), sh.Commit.BlockID.Hash; !bytes.Equal(hhash, chash) {
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return fmt.Errorf("commit signs block %X, header is block %X", chash, hhash)
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}
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return nil
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}
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// String returns a string representation of SignedHeader.
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func (sh SignedHeader) String() string {
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return sh.StringIndented("")
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}
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// StringIndented returns an indented string representation of SignedHeader.
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//
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// Header
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// Commit
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func (sh SignedHeader) StringIndented(indent string) string {
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return fmt.Sprintf(`SignedHeader{
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%s %v
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%s %v
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%s}`,
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indent, sh.Header.StringIndented(indent+" "),
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indent, sh.Commit.StringIndented(indent+" "),
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indent)
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}
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// ToProto converts SignedHeader to protobuf
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func (sh *SignedHeader) ToProto() *tmproto.SignedHeader {
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if sh == nil {
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return nil
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}
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psh := new(tmproto.SignedHeader)
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if sh.Header != nil {
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psh.Header = sh.Header.ToProto()
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}
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if sh.Commit != nil {
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psh.Commit = sh.Commit.ToProto()
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}
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return psh
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}
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// FromProto sets a protobuf SignedHeader to the given pointer.
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// It returns an error if the header or the commit is invalid.
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func SignedHeaderFromProto(shp *tmproto.SignedHeader) (*SignedHeader, error) {
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if shp == nil {
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return nil, errors.New("nil SignedHeader")
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}
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sh := new(SignedHeader)
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if shp.Header != nil {
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h, err := HeaderFromProto(shp.Header)
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if err != nil {
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return nil, err
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}
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sh.Header = &h
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}
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if shp.Commit != nil {
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c, err := CommitFromProto(shp.Commit)
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if err != nil {
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return nil, err
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}
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sh.Commit = c
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}
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return sh, nil
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}
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