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150 lines
4.4 KiB
150 lines
4.4 KiB
package lite
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import (
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"time"
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"github.com/tendermint/tendermint/crypto"
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"github.com/tendermint/tendermint/crypto/ed25519"
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"github.com/tendermint/tendermint/crypto/secp256k1"
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"github.com/tendermint/tendermint/types"
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tmtime "github.com/tendermint/tendermint/types/time"
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)
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// privKeys is a helper type for testing.
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//
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// It lets us simulate signing with many keys. The main use case is to create
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// a set, and call GenSignedHeader 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 ToValidators,
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// and can optionally extend the validator set later with Extend.
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type privKeys []crypto.PrivKey
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// genPrivKeys produces an array of private keys to generate commits.
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func genPrivKeys(n int) privKeys {
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res := make(privKeys, n)
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for i := range res {
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res[i] = ed25519.GenPrivKey()
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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 (pkz privKeys) Change(i int) privKeys {
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res := make(privKeys, len(pkz))
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copy(res, pkz)
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res[i] = ed25519.GenPrivKey()
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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 (pkz privKeys) Extend(n int) privKeys {
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extra := genPrivKeys(n)
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return append(pkz, extra...)
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}
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// GenSecpPrivKeys produces an array of secp256k1 private keys to generate commits.
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func GenSecpPrivKeys(n int) privKeys {
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res := make(privKeys, n)
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for i := range res {
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res[i] = secp256k1.GenPrivKey()
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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 (pkz privKeys) ExtendSecp(n int) privKeys {
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extra := GenSecpPrivKeys(n)
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return append(pkz, extra...)
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}
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// ToValidators produces a valset 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 (pkz privKeys) ToValidators(init, inc int64) *types.ValidatorSet {
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res := make([]*types.Validator, len(pkz))
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for i, k := range pkz {
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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 (pkz privKeys) signHeader(header *types.Header, first, last int) *types.Commit {
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commitSigs := make([]types.CommitSig, len(pkz))
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for i := 0; i < len(pkz); i++ {
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commitSigs[i] = types.NewCommitSigAbsent()
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}
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// We need this list to keep the ordering.
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vset := pkz.ToValidators(1, 0)
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blockID := types.BlockID{
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Hash: header.Hash(),
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PartsHeader: types.PartSetHeader{Total: 1, Hash: crypto.CRandBytes(32)},
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}
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// Fill in the votes we want.
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for i := first; i < last && i < len(pkz); i++ {
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vote := makeVote(header, vset, pkz[i], blockID)
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commitSigs[vote.ValidatorIndex] = vote.CommitSig()
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}
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return types.NewCommit(header.Height, 1, blockID, commitSigs)
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}
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func makeVote(header *types.Header, valset *types.ValidatorSet,
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key crypto.PrivKey, blockID types.BlockID) *types.Vote {
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addr := key.PubKey().Address()
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idx, _ := valset.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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Timestamp: tmtime.Now(),
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Type: types.PrecommitType,
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BlockID: blockID,
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}
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// Sign it
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signBytes := vote.SignBytes(header.ChainID)
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// TODO Consider reworking makeVote API to return an error
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sig, err := key.Sign(signBytes)
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if err != nil {
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panic(err)
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}
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vote.Signature = sig
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return vote
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}
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func genHeader(chainID string, height int64, bTime time.Time, txs types.Txs,
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valset, nextValset *types.ValidatorSet, appHash, consHash, resHash []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: bTime,
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// LastBlockID
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// LastCommitHash
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ValidatorsHash: valset.Hash(),
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NextValidatorsHash: nextValset.Hash(),
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DataHash: txs.Hash(),
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AppHash: appHash,
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ConsensusHash: consHash,
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LastResultsHash: resHash,
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}
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}
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// GenSignedHeader calls genHeader and signHeader and combines them into a SignedHeader.
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func (pkz privKeys) GenSignedHeader(chainID string, height int64, bTime time.Time, txs types.Txs,
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valset, nextValset *types.ValidatorSet, appHash, consHash, resHash []byte, first, last int) *types.SignedHeader {
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header := genHeader(chainID, height, bTime, txs, valset, nextValset, appHash, consHash, resHash)
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return &types.SignedHeader{
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Header: header,
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Commit: pkz.signHeader(header, first, last),
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}
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}
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