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package dummy
import (
"bytes"
"encoding/hex"
"fmt"
"strconv"
"strings"
"github.com/tendermint/abci/example/code"
"github.com/tendermint/abci/types"
crypto "github.com/tendermint/go-crypto"
"github.com/tendermint/iavl"
cmn "github.com/tendermint/tmlibs/common"
dbm "github.com/tendermint/tmlibs/db"
"github.com/tendermint/tmlibs/log"
)
const (
ValidatorSetChangePrefix string = "val:"
)
//-----------------------------------------
var _ types.Application = (*PersistentDummyApplication)(nil)
type PersistentDummyApplication struct {
app *DummyApplication
// validator set
updates []*types.Validator
logger log.Logger
}
func NewPersistentDummyApplication(dbDir string) *PersistentDummyApplication {
name := "dummy"
db, err := dbm.NewGoLevelDB(name, dbDir)
if err != nil {
panic(err)
}
stateTree := iavl.NewVersionedTree(500, db)
stateTree.Load()
return &PersistentDummyApplication{
app: &DummyApplication{state: stateTree},
logger: log.NewNopLogger(),
}
}
func (app *PersistentDummyApplication) SetLogger(l log.Logger) {
app.logger = l
}
func (app *PersistentDummyApplication) Info(req types.RequestInfo) types.ResponseInfo {
res := app.app.Info(req)
var latestVersion uint64 = app.app.state.LatestVersion() // TODO: change to int64
res.LastBlockHeight = int64(latestVersion)
res.LastBlockAppHash = app.app.state.Hash()
return res
}
func (app *PersistentDummyApplication) 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 *PersistentDummyApplication) 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.updates
return app.execValidatorTx(tx)
}
// otherwise, update the key-value store
return app.app.DeliverTx(tx)
}
func (app *PersistentDummyApplication) CheckTx(tx []byte) types.ResponseCheckTx {
return app.app.CheckTx(tx)
}
// Commit will panic if InitChain was not called
func (app *PersistentDummyApplication) Commit() types.ResponseCommit {
// Save a new version for next height
height := app.app.state.LatestVersion() + 1
var appHash []byte
var err error
appHash, err = app.app.state.SaveVersion(height)
if err != nil {
// if this wasn't a dummy app, we'd do something smarter
panic(err)
}
app.logger.Info("Commit block", "height", height, "root", appHash)
return types.ResponseCommit{Code: code.CodeTypeOK, Data: appHash}
}
func (app *PersistentDummyApplication) Query(reqQuery types.RequestQuery) types.ResponseQuery {
return app.app.Query(reqQuery)
}
// Save the validators in the merkle tree
func (app *PersistentDummyApplication) 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 *PersistentDummyApplication) BeginBlock(req types.RequestBeginBlock) types.ResponseBeginBlock {
// reset valset changes
app.updates = make([]*types.Validator, 0)
return types.ResponseBeginBlock{}
}
// Update the validator set
func (app *PersistentDummyApplication) EndBlock(req types.RequestEndBlock) types.ResponseEndBlock {
return types.ResponseEndBlock{Updates: app.updates}
}
//---------------------------------------------
// update validators
func (app *PersistentDummyApplication) Validators() (validators []*types.Validator) {
app.app.state.Iterate(func(key, value []byte) bool {
if isValidatorTx(key) {
validator := new(types.Validator)
err := types.ReadMessage(bytes.NewBuffer(value), validator)
if err != nil {
panic(err)
}
validators = append(validators, validator)
}
return false
})
return
}
func MakeValSetChangeTx(pubkey []byte, power int64) []byte {
return []byte(cmn.Fmt("val:%X/%d", pubkey, power))
}
func isValidatorTx(tx []byte) bool {
return strings.HasPrefix(string(tx), ValidatorSetChangePrefix)
}
// format is "val:pubkey1/power1,addr2/power2,addr3/power3"tx
func (app *PersistentDummyApplication) 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, ensuring its go-crypto encoded
pubkey, err := hex.DecodeString(pubkeyS)
if err != nil {
return types.ResponseDeliverTx{
Code: code.CodeTypeEncodingError,
Log: fmt.Sprintf("Pubkey (%s) is invalid hex", pubkeyS)}
}
_, err = crypto.PubKeyFromBytes(pubkey)
if err != nil {
return types.ResponseDeliverTx{
Code: code.CodeTypeEncodingError,
Log: fmt.Sprintf("Pubkey (%X) is invalid go-crypto encoded", pubkey)}
}
// 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.Validator{pubkey, power})
}
// add, update, or remove a validator
func (app *PersistentDummyApplication) updateValidator(v *types.Validator) types.ResponseDeliverTx {
key := []byte("val:" + string(v.PubKey))
if v.Power == 0 {
// remove validator
if !app.app.state.Has(key) {
return types.ResponseDeliverTx{
Code: code.CodeTypeUnauthorized,
Log: fmt.Sprintf("Cannot remove non-existent validator %X", key)}
}
app.app.state.Remove(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.Set(key, value.Bytes())
}
// we only update the changes array if we successfully updated the tree
app.updates = append(app.updates, v)
return types.ResponseDeliverTx{Code: code.CodeTypeOK}
}