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package certifiers
import (
"bytes"
"github.com/pkg/errors"
"github.com/tendermint/tendermint/types"
certerr "github.com/tendermint/tendermint/certifiers/errors"
)
var _ Certifier = &Static{}
// Static assumes a static set of validators, set on
// initilization and checks against them.
// The signatures on every header is checked for > 2/3 votes
// against the known validator set upon Certify
//
// Good for testing or really simple chains. Building block
// to support real-world functionality.
type Static struct {
chainID string
vSet *types.ValidatorSet
vhash []byte
}
func NewStatic(chainID string, vals *types.ValidatorSet) *Static {
return &Static{
chainID: chainID,
vSet: vals,
}
}
func (c *Static) ChainID() string {
return c.chainID
}
func (c *Static) Validators() *types.ValidatorSet {
return c.vSet
}
func (c *Static) Hash() []byte {
if len(c.vhash) == 0 {
c.vhash = c.vSet.Hash()
}
return c.vhash
}
func (c *Static) Certify(commit Commit) error {
// do basic sanity checks
err := commit.ValidateBasic(c.chainID)
if err != nil {
return err
}
// make sure it has the same validator set we have (static means static)
if !bytes.Equal(c.Hash(), commit.Header.ValidatorsHash) {
return certerr.ErrValidatorsChanged()
}
// then make sure we have the proper signatures for this
err = c.vSet.VerifyCommit(c.chainID, commit.Commit.BlockID,
commit.Header.Height, commit.Commit)
return errors.WithStack(err)
}