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package lite
import (
"bytes"
"errors"
"fmt"
"github.com/tendermint/tendermint/types"
)
// FullCommit contains a SignedHeader (the block header and a commit that signs it),
// the validator set which signed the commit, and the next validator set. The
// next validator set (which is proven from the block header) allows us to
// revert to block-by-block updating of lite Verifier's latest validator set,
// even in the face of arbitrarily large power changes.
type FullCommit struct {
SignedHeader types.SignedHeader `json:"signed_header"`
Validators *types.ValidatorSet `json:"validator_set"`
NextValidators *types.ValidatorSet `json:"next_validator_set"`
}
// NewFullCommit returns a new FullCommit.
func NewFullCommit(signedHeader types.SignedHeader, valset, nextValset *types.ValidatorSet) FullCommit {
return FullCommit{
SignedHeader: signedHeader,
Validators: valset,
NextValidators: nextValset,
}
}
// Validate the components and check for consistency.
// This also checks to make sure that Validators actually
// signed the SignedHeader.Commit.
// If > 2/3 did not sign the Commit from fc.Validators, it
// is not a valid commit!
func (fc FullCommit) ValidateFull(chainID string) error {
// Ensure that Validators exists and matches the header.
if fc.Validators.Size() == 0 {
return errors.New("need FullCommit.Validators")
}
if !bytes.Equal(
fc.SignedHeader.ValidatorsHash,
fc.Validators.Hash()) {
return fmt.Errorf("header has vhash %X but valset hash is %X",
fc.SignedHeader.ValidatorsHash,
fc.Validators.Hash(),
)
}
// Ensure that NextValidators exists and matches the header.
if fc.NextValidators.Size() == 0 {
return errors.New("need FullCommit.NextValidators")
}
if !bytes.Equal(
fc.SignedHeader.NextValidatorsHash,
fc.NextValidators.Hash()) {
return fmt.Errorf("header has next vhash %X but next valset hash is %X",
fc.SignedHeader.NextValidatorsHash,
fc.NextValidators.Hash(),
)
}
// Validate the header.
err := fc.SignedHeader.ValidateBasic(chainID)
if err != nil {
return err
}
// Validate the signatures on the commit.
hdr, cmt := fc.SignedHeader.Header, fc.SignedHeader.Commit
return fc.Validators.VerifyCommit(
hdr.ChainID, cmt.BlockID,
hdr.Height, cmt)
}
// Height returns the height of the header.
func (fc FullCommit) Height() int64 {
if fc.SignedHeader.Header == nil {
panic("should not happen")
}
return fc.SignedHeader.Height
}
// ChainID returns the chainID of the header.
func (fc FullCommit) ChainID() string {
if fc.SignedHeader.Header == nil {
panic("should not happen")
}
return fc.SignedHeader.ChainID
}
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