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149 lines
4.2 KiB
149 lines
4.2 KiB
package light
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import (
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"time"
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crypto "github.com/tendermint/go-crypto"
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"github.com/tendermint/tendermint/types"
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)
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// ValKeys is a helper for testing.
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//
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// It lets us simulate signing with many keys, either ed25519 or secp256k1.
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// The main use case is to create a set, and call GenCommit
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// to get properly signed header for testing.
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//
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// You can set different weights of validators each time you call
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// ToValidators, and can optionally extend the validator set later
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// with Extend or ExtendSecp
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type ValKeys []crypto.PrivKey
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// GenValKeys produces an array of private keys to generate commits.
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func GenValKeys(n int) ValKeys {
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res := make(ValKeys, n)
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for i := range res {
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res[i] = crypto.GenPrivKeyEd25519().Wrap()
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}
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return res
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}
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// Change replaces the key at index i.
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func (v ValKeys) Change(i int) ValKeys {
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res := make(ValKeys, len(v))
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copy(res, v)
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res[i] = crypto.GenPrivKeyEd25519().Wrap()
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return res
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}
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// Extend adds n more keys (to remove, just take a slice).
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func (v ValKeys) Extend(n int) ValKeys {
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extra := GenValKeys(n)
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return append(v, extra...)
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}
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// GenSecpValKeys produces an array of secp256k1 private keys to generate commits.
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func GenSecpValKeys(n int) ValKeys {
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res := make(ValKeys, n)
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for i := range res {
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res[i] = crypto.GenPrivKeySecp256k1().Wrap()
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}
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return res
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}
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// ExtendSecp adds n more secp256k1 keys (to remove, just take a slice).
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func (v ValKeys) ExtendSecp(n int) ValKeys {
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extra := GenSecpValKeys(n)
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return append(v, extra...)
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}
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// ToValidators produces a list of validators from the set of keys
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// The first key has weight `init` and it increases by `inc` every step
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// so we can have all the same weight, or a simple linear distribution
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// (should be enough for testing).
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func (v ValKeys) ToValidators(init, inc int64) *types.ValidatorSet {
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res := make([]*types.Validator, len(v))
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for i, k := range v {
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res[i] = types.NewValidator(k.PubKey(), init+int64(i)*inc)
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}
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return types.NewValidatorSet(res)
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}
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// signHeader properly signs the header with all keys from first to last exclusive.
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func (v ValKeys) signHeader(header *types.Header, first, last int) *types.Commit {
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votes := make([]*types.Vote, len(v))
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// we need this list to keep the ordering...
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vset := v.ToValidators(1, 0)
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// fill in the votes we want
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for i := first; i < last; i++ {
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vote := makeVote(header, vset, v[i])
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votes[vote.ValidatorIndex] = vote
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}
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res := &types.Commit{
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BlockID: types.BlockID{Hash: header.Hash()},
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Precommits: votes,
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}
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return res
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}
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func makeVote(header *types.Header, vals *types.ValidatorSet, key crypto.PrivKey) *types.Vote {
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addr := key.PubKey().Address()
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idx, _ := vals.GetByAddress(addr)
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vote := &types.Vote{
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ValidatorAddress: addr,
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ValidatorIndex: idx,
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Height: header.Height,
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Round: 1,
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Type: types.VoteTypePrecommit,
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BlockID: types.BlockID{Hash: header.Hash()},
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}
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// Sign it
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signBytes := types.SignBytes(header.ChainID, vote)
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vote.Signature = key.Sign(signBytes)
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return vote
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}
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// Silences warning that vals can also be merkle.Hashable
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// nolint: interfacer
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func genHeader(chainID string, height int, txs types.Txs,
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vals *types.ValidatorSet, appHash []byte) *types.Header {
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return &types.Header{
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ChainID: chainID,
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Height: height,
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Time: time.Now(),
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NumTxs: len(txs),
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// LastBlockID
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// LastCommitHash
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ValidatorsHash: vals.Hash(),
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DataHash: txs.Hash(),
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AppHash: appHash,
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}
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}
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// GenCommit calls genHeader and signHeader and combines them into a Commit.
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func (v ValKeys) GenCommit(chainID string, height int, txs types.Txs,
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vals *types.ValidatorSet, appHash []byte, first, last int) Commit {
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header := genHeader(chainID, height, txs, vals, appHash)
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check := Commit{
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Header: header,
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Commit: v.signHeader(header, first, last),
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}
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return check
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}
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// GenFullCommit calls genHeader and signHeader and combines them into a Commit.
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func (v ValKeys) GenFullCommit(chainID string, height int, txs types.Txs,
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vals *types.ValidatorSet, appHash []byte, first, last int) FullCommit {
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header := genHeader(chainID, height, txs, vals, appHash)
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commit := Commit{
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Header: header,
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Commit: v.signHeader(header, first, last),
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}
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return NewFullCommit(commit, vals)
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}
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