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package light_test
import (
"time"
"github.com/tendermint/tendermint/crypto"
"github.com/tendermint/tendermint/crypto/ed25519"
"github.com/tendermint/tendermint/crypto/tmhash"
tmproto "github.com/tendermint/tendermint/proto/types"
"github.com/tendermint/tendermint/types"
tmtime "github.com/tendermint/tendermint/types/time"
)
// privKeys is a helper type for testing.
//
// It lets us simulate signing with many keys. The main use case is to create
// a set, and call GenSignedHeader to get properly signed header for testing.
//
// You can set different weights of validators each time you call ToValidators,
// and can optionally extend the validator set later with Extend.
type privKeys []crypto.PrivKey
// genPrivKeys produces an array of private keys to generate commits.
func genPrivKeys(n int) privKeys {
res := make(privKeys, n)
for i := range res {
res[i] = ed25519.GenPrivKey()
}
return res
}
// // Change replaces the key at index i.
// func (pkz privKeys) Change(i int) privKeys {
// res := make(privKeys, len(pkz))
// copy(res, pkz)
// res[i] = ed25519.GenPrivKey()
// return res
// }
// Extend adds n more keys (to remove, just take a slice).
func (pkz privKeys) Extend(n int) privKeys {
extra := genPrivKeys(n)
return append(pkz, extra...)
}
// // GenSecpPrivKeys produces an array of secp256k1 private keys to generate commits.
// func GenSecpPrivKeys(n int) privKeys {
// res := make(privKeys, n)
// for i := range res {
// res[i] = secp256k1.GenPrivKey()
// }
// return res
// }
// // ExtendSecp adds n more secp256k1 keys (to remove, just take a slice).
// func (pkz privKeys) ExtendSecp(n int) privKeys {
// extra := GenSecpPrivKeys(n)
// return append(pkz, extra...)
// }
// ToValidators produces a valset from the set of keys.
// The first key has weight `init` and it increases by `inc` every step
// so we can have all the same weight, or a simple linear distribution
// (should be enough for testing).
func (pkz privKeys) ToValidators(init, inc int64) *types.ValidatorSet {
res := make([]*types.Validator, len(pkz))
for i, k := range pkz {
res[i] = types.NewValidator(k.PubKey(), init+int64(i)*inc)
}
return types.NewValidatorSet(res)
}
// signHeader properly signs the header with all keys from first to last exclusive.
func (pkz privKeys) signHeader(header *types.Header, first, last int) *types.Commit {
commitSigs := make([]types.CommitSig, len(pkz))
for i := 0; i < len(pkz); i++ {
commitSigs[i] = types.NewCommitSigAbsent()
}
// We need this list to keep the ordering.
vset := pkz.ToValidators(1, 1)
blockID := types.BlockID{
Hash: header.Hash(),
PartSetHeader: types.PartSetHeader{Total: 1, Hash: crypto.CRandBytes(32)},
}
// Fill in the votes we want.
for i := first; i < last && i < len(pkz); i++ {
vote := makeVote(header, vset, pkz[i], blockID)
commitSigs[vote.ValidatorIndex] = vote.CommitSig()
}
return types.NewCommit(header.Height, 1, blockID, commitSigs)
}
func makeVote(header *types.Header, valset *types.ValidatorSet,
key crypto.PrivKey, blockID types.BlockID) *types.Vote {
addr := key.PubKey().Address()
idx, _ := valset.GetByAddress(addr)
vote := &types.Vote{
ValidatorAddress: addr,
ValidatorIndex: idx,
Height: header.Height,
Round: 1,
Timestamp: tmtime.Now(),
Type: tmproto.PrecommitType,
BlockID: blockID,
}
v := vote.ToProto()
// Sign it
signBytes := types.VoteSignBytes(header.ChainID, v)
sig, err := key.Sign(signBytes)
if err != nil {
panic(err)
}
vote.Signature = sig
return vote
}
func genHeader(chainID string, height int64, bTime time.Time, txs types.Txs,
valset, nextValset *types.ValidatorSet, appHash, consHash, resHash []byte) *types.Header {
return &types.Header{
ChainID: chainID,
Height: height,
Time: bTime,
// LastBlockID
// LastCommitHash
ValidatorsHash: valset.Hash(),
NextValidatorsHash: nextValset.Hash(),
DataHash: txs.Hash(),
AppHash: appHash,
ConsensusHash: consHash,
LastResultsHash: resHash,
ProposerAddress: valset.Validators[0].Address,
}
}
// GenSignedHeader calls genHeader and signHeader and combines them into a SignedHeader.
func (pkz privKeys) GenSignedHeader(chainID string, height int64, bTime time.Time, txs types.Txs,
valset, nextValset *types.ValidatorSet, appHash, consHash, resHash []byte, first, last int) *types.SignedHeader {
header := genHeader(chainID, height, bTime, txs, valset, nextValset, appHash, consHash, resHash)
return &types.SignedHeader{
Header: header,
Commit: pkz.signHeader(header, first, last),
}
}
// GenSignedHeaderLastBlockID calls genHeader and signHeader and combines them into a SignedHeader.
func (pkz privKeys) GenSignedHeaderLastBlockID(chainID string, height int64, bTime time.Time, txs types.Txs,
valset, nextValset *types.ValidatorSet, appHash, consHash, resHash []byte, first, last int,
lastBlockID types.BlockID) *types.SignedHeader {
header := genHeader(chainID, height, bTime, txs, valset, nextValset, appHash, consHash, resHash)
header.LastBlockID = lastBlockID
return &types.SignedHeader{
Header: header,
Commit: pkz.signHeader(header, first, last),
}
}
func (pkz privKeys) ChangeKeys(delta int) privKeys {
newKeys := pkz[delta:]
return newKeys.Extend(delta)
}
// Generates the header and validator set to create a full entire mock node with blocks to height (
// blockSize) and with variation in validator sets. BlockIntervals are in per minute.
// NOTE: Expected to have a large validator set size ~ 100 validators.
func GenMockNode(
chainID string,
blockSize int64,
valSize int,
valVariation float32,
bTime time.Time) (
string,
map[int64]*types.SignedHeader,
map[int64]*types.ValidatorSet) {
var (
headers = make(map[int64]*types.SignedHeader, blockSize)
valset = make(map[int64]*types.ValidatorSet, blockSize)
keys = genPrivKeys(valSize)
totalVariation = valVariation
valVariationInt int
newKeys privKeys
)
valVariationInt = int(totalVariation)
totalVariation = -float32(valVariationInt)
newKeys = keys.ChangeKeys(valVariationInt)
// genesis header and vals
lastHeader := keys.GenSignedHeader(chainID, 1, bTime.Add(1*time.Minute), nil,
keys.ToValidators(2, 2), newKeys.ToValidators(2, 2), hash("app_hash"), hash("cons_hash"),
hash("results_hash"), 0, len(keys))
currentHeader := lastHeader
headers[1] = currentHeader
valset[1] = keys.ToValidators(2, 2)
keys = newKeys
for height := int64(2); height <= blockSize; height++ {
totalVariation += valVariation
valVariationInt = int(totalVariation)
totalVariation = -float32(valVariationInt)
newKeys = keys.ChangeKeys(valVariationInt)
currentHeader = keys.GenSignedHeaderLastBlockID(chainID, height, bTime.Add(time.Duration(height)*time.Minute),
nil,
keys.ToValidators(2, 2), newKeys.ToValidators(2, 2), hash("app_hash"), hash("cons_hash"),
hash("results_hash"), 0, len(keys), types.BlockID{Hash: lastHeader.Hash()})
headers[height] = currentHeader
valset[height] = keys.ToValidators(2, 2)
lastHeader = currentHeader
keys = newKeys
}
return chainID, headers, valset
}
func hash(s string) []byte {
return tmhash.Sum([]byte(s))
}