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72 lines
1.9 KiB
72 lines
1.9 KiB
package lite
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import (
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"bytes"
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lerr "github.com/tendermint/tendermint/lite/errors"
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"github.com/tendermint/tendermint/types"
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cmn "github.com/tendermint/tendermint/libs/common"
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)
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var _ Certifier = (*BaseCertifier)(nil)
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// BaseCertifier lets us check the validity of SignedHeaders at height or
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// later, requiring sufficient votes (> 2/3) from the given valset.
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// To certify blocks produced by a blockchain with mutable validator sets,
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// use the InquiringCertifier.
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// TODO: Handle unbonding time.
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type BaseCertifier struct {
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chainID string
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height int64
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valset *types.ValidatorSet
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}
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// NewBaseCertifier returns a new certifier initialized with a validator set at
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// some height.
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func NewBaseCertifier(chainID string, height int64, valset *types.ValidatorSet) *BaseCertifier {
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if valset == nil || len(valset.Hash()) == 0 {
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panic("NewBaseCertifier requires a valid valset")
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}
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return &BaseCertifier{
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chainID: chainID,
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height: height,
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valset: valset,
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}
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}
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// Implements Certifier.
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func (bc *BaseCertifier) ChainID() string {
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return bc.chainID
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}
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// Implements Certifier.
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func (bc *BaseCertifier) Certify(signedHeader types.SignedHeader) error {
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// We can't certify commits older than bc.height.
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if signedHeader.Height < bc.height {
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return cmn.NewError("BaseCertifier height is %v, cannot certify height %v",
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bc.height, signedHeader.Height)
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}
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// We can't certify with the wrong validator set.
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if !bytes.Equal(signedHeader.ValidatorsHash,
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bc.valset.Hash()) {
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return lerr.ErrUnexpectedValidators(signedHeader.ValidatorsHash, bc.valset.Hash())
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}
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// Do basic sanity checks.
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err := signedHeader.ValidateBasic(bc.chainID)
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if err != nil {
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return cmn.ErrorWrap(err, "in certify")
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}
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// Check commit signatures.
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err = bc.valset.VerifyCommit(
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bc.chainID, signedHeader.Commit.BlockID,
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signedHeader.Height, signedHeader.Commit)
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if err != nil {
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return cmn.ErrorWrap(err, "in certify")
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}
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return nil
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}
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