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persistent_kvstore.go
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/
persistent_kvstore.go
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package kvstore
import (
"bytes"
"encoding/hex"
"fmt"
"strconv"
"strings"
"github.com/tendermint/tendermint/abci/example/code"
"github.com/tendermint/tendermint/abci/types"
dbm "github.com/tendermint/tendermint/libs/db"
"github.com/tendermint/tendermint/libs/log"
)
const (
ValidatorSetChangePrefix string = "val:"
)
//-----------------------------------------
var _ types.Application = (*PersistentKVStoreApplication)(nil)
type PersistentKVStoreApplication struct {
app *KVStoreApplication
// validator set
ValUpdates []types.ValidatorUpdate
logger log.Logger
}
func NewPersistentKVStoreApplication(dbDir string) *PersistentKVStoreApplication {
name := "kvstore"
db, err := dbm.NewGoLevelDB(name, dbDir)
if err != nil {
panic(err)
}
state := loadState(db)
return &PersistentKVStoreApplication{
app: &KVStoreApplication{state: state},
logger: log.NewNopLogger(),
}
}
func (app *PersistentKVStoreApplication) SetLogger(l log.Logger) {
app.logger = l
}
func (app *PersistentKVStoreApplication) Info(req types.RequestInfo) types.ResponseInfo {
res := app.app.Info(req)
res.LastBlockHeight = app.app.state.Height
res.LastBlockAppHash = app.app.state.AppHash
return res
}
func (app *PersistentKVStoreApplication) SetOption(req types.RequestSetOption) types.ResponseSetOption {
return app.app.SetOption(req)
}
// tx is either "val:pubkey/power" or "key=value" or just arbitrary bytes
func (app *PersistentKVStoreApplication) DeliverTx(tx []byte) types.ResponseDeliverTx {
// if it starts with "val:", update the validator set
// format is "val:pubkey/power"
if isValidatorTx(tx) {
// update validators in the merkle tree
// and in app.ValUpdates
return app.execValidatorTx(tx)
}
// otherwise, update the key-value store
return app.app.DeliverTx(tx)
}
func (app *PersistentKVStoreApplication) CheckTx(tx []byte) types.ResponseCheckTx {
return app.app.CheckTx(tx)
}
// Commit will panic if InitChain was not called
func (app *PersistentKVStoreApplication) Commit() types.ResponseCommit {
return app.app.Commit()
}
func (app *PersistentKVStoreApplication) Query(reqQuery types.RequestQuery) types.ResponseQuery {
return app.app.Query(reqQuery)
}
// Save the validators in the merkle tree
func (app *PersistentKVStoreApplication) InitChain(req types.RequestInitChain) types.ResponseInitChain {
for _, v := range req.Validators {
r := app.updateValidator(v)
if r.IsErr() {
app.logger.Error("Error updating validators", "r", r)
}
}
return types.ResponseInitChain{}
}
// Track the block hash and header information
func (app *PersistentKVStoreApplication) BeginBlock(req types.RequestBeginBlock) types.ResponseBeginBlock {
// reset valset changes
app.ValUpdates = make([]types.ValidatorUpdate, 0)
return types.ResponseBeginBlock{}
}
// Update the validator set
func (app *PersistentKVStoreApplication) EndBlock(req types.RequestEndBlock) types.ResponseEndBlock {
return types.ResponseEndBlock{ValidatorUpdates: app.ValUpdates}
}
//---------------------------------------------
// update validators
func (app *PersistentKVStoreApplication) Validators() (validators []types.ValidatorUpdate) {
itr := app.app.state.db.Iterator(nil, nil)
for ; itr.Valid(); itr.Next() {
if isValidatorTx(itr.Key()) {
validator := new(types.ValidatorUpdate)
err := types.ReadMessage(bytes.NewBuffer(itr.Value()), validator)
if err != nil {
panic(err)
}
validators = append(validators, *validator)
}
}
return
}
func MakeValSetChangeTx(pubkey types.PubKey, power int64) []byte {
return []byte(fmt.Sprintf("val:%X/%d", pubkey.Data, power))
}
func isValidatorTx(tx []byte) bool {
return strings.HasPrefix(string(tx), ValidatorSetChangePrefix)
}
// format is "val:pubkey/power"
// pubkey is raw 32-byte ed25519 key
func (app *PersistentKVStoreApplication) execValidatorTx(tx []byte) types.ResponseDeliverTx {
tx = tx[len(ValidatorSetChangePrefix):]
//get the pubkey and power
pubKeyAndPower := strings.Split(string(tx), "/")
if len(pubKeyAndPower) != 2 {
return types.ResponseDeliverTx{
Code: code.CodeTypeEncodingError,
Log: fmt.Sprintf("Expected 'pubkey/power'. Got %v", pubKeyAndPower)}
}
pubkeyS, powerS := pubKeyAndPower[0], pubKeyAndPower[1]
// decode the pubkey
pubkey, err := hex.DecodeString(pubkeyS)
if err != nil {
return types.ResponseDeliverTx{
Code: code.CodeTypeEncodingError,
Log: fmt.Sprintf("Pubkey (%s) is invalid hex", pubkeyS)}
}
// decode the power
power, err := strconv.ParseInt(powerS, 10, 64)
if err != nil {
return types.ResponseDeliverTx{
Code: code.CodeTypeEncodingError,
Log: fmt.Sprintf("Power (%s) is not an int", powerS)}
}
// update
return app.updateValidator(types.Ed25519ValidatorUpdate(pubkey, int64(power)))
}
// add, update, or remove a validator
func (app *PersistentKVStoreApplication) updateValidator(v types.ValidatorUpdate) types.ResponseDeliverTx {
key := []byte("val:" + string(v.PubKey.Data))
if v.Power == 0 {
// remove validator
if !app.app.state.db.Has(key) {
return types.ResponseDeliverTx{
Code: code.CodeTypeUnauthorized,
Log: fmt.Sprintf("Cannot remove non-existent validator %X", key)}
}
app.app.state.db.Delete(key)
} else {
// add or update validator
value := bytes.NewBuffer(make([]byte, 0))
if err := types.WriteMessage(&v, value); err != nil {
return types.ResponseDeliverTx{
Code: code.CodeTypeEncodingError,
Log: fmt.Sprintf("Error encoding validator: %v", err)}
}
app.app.state.db.Set(key, value.Bytes())
}
// we only update the changes array if we successfully updated the tree
app.ValUpdates = append(app.ValUpdates, v)
return types.ResponseDeliverTx{Code: code.CodeTypeOK}
}