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222 lines
6.2 KiB
222 lines
6.2 KiB
package dummy
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import (
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"bytes"
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"encoding/hex"
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"fmt"
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"strconv"
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"strings"
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"github.com/tendermint/abci/example/code"
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"github.com/tendermint/abci/types"
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crypto "github.com/tendermint/go-crypto"
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"github.com/tendermint/iavl"
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cmn "github.com/tendermint/tmlibs/common"
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dbm "github.com/tendermint/tmlibs/db"
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"github.com/tendermint/tmlibs/log"
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)
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const (
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ValidatorSetChangePrefix string = "val:"
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)
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//-----------------------------------------
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var _ types.Application = (*PersistentDummyApplication)(nil)
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type PersistentDummyApplication struct {
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app *DummyApplication
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// validator set
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changes []*types.Validator
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logger log.Logger
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}
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func NewPersistentDummyApplication(dbDir string) *PersistentDummyApplication {
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name := "dummy"
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db, err := dbm.NewGoLevelDB(name, dbDir)
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if err != nil {
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panic(err)
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}
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stateTree := iavl.NewVersionedTree(500, db)
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stateTree.Load()
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return &PersistentDummyApplication{
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app: &DummyApplication{state: stateTree},
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logger: log.NewNopLogger(),
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}
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}
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func (app *PersistentDummyApplication) SetLogger(l log.Logger) {
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app.logger = l
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}
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func (app *PersistentDummyApplication) Info(req types.RequestInfo) types.ResponseInfo {
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res := app.app.Info(req)
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var latestVersion uint64 = app.app.state.LatestVersion() // TODO: change to int64
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res.LastBlockHeight = int64(latestVersion)
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res.LastBlockAppHash = app.app.state.Hash()
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return res
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}
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func (app *PersistentDummyApplication) SetOption(req types.RequestSetOption) types.ResponseSetOption {
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return app.app.SetOption(req)
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}
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// tx is either "val:pubkey/power" or "key=value" or just arbitrary bytes
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func (app *PersistentDummyApplication) DeliverTx(tx []byte) types.ResponseDeliverTx {
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// if it starts with "val:", update the validator set
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// format is "val:pubkey/power"
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if isValidatorTx(tx) {
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// update validators in the merkle tree
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// and in app.changes
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return app.execValidatorTx(tx)
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}
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// otherwise, update the key-value store
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return app.app.DeliverTx(tx)
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}
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func (app *PersistentDummyApplication) CheckTx(tx []byte) types.ResponseCheckTx {
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return app.app.CheckTx(tx)
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}
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// Commit will panic if InitChain was not called
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func (app *PersistentDummyApplication) Commit() types.ResponseCommit {
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// Save a new version for next height
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height := app.app.state.LatestVersion() + 1
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var appHash []byte
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var err error
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appHash, err = app.app.state.SaveVersion(height)
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if err != nil {
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// if this wasn't a dummy app, we'd do something smarter
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panic(err)
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}
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app.logger.Info("Commit block", "height", height, "root", appHash)
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return types.ResponseCommit{Code: code.CodeTypeOK, Data: appHash}
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}
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func (app *PersistentDummyApplication) Query(reqQuery types.RequestQuery) types.ResponseQuery {
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return app.app.Query(reqQuery)
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}
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// Save the validators in the merkle tree
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func (app *PersistentDummyApplication) InitChain(req types.RequestInitChain) types.ResponseInitChain {
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for _, v := range req.Validators {
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r := app.updateValidator(v)
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if r.IsErr() {
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app.logger.Error("Error updating validators", "r", r)
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}
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}
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return types.ResponseInitChain{}
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}
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// Track the block hash and header information
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func (app *PersistentDummyApplication) BeginBlock(req types.RequestBeginBlock) types.ResponseBeginBlock {
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// reset valset changes
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app.changes = make([]*types.Validator, 0)
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return types.ResponseBeginBlock{}
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}
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// Update the validator set
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func (app *PersistentDummyApplication) EndBlock(req types.RequestEndBlock) types.ResponseEndBlock {
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return types.ResponseEndBlock{Diffs: app.changes}
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}
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//---------------------------------------------
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// update validators
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func (app *PersistentDummyApplication) Validators() (validators []*types.Validator) {
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app.app.state.Iterate(func(key, value []byte) bool {
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if isValidatorTx(key) {
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validator := new(types.Validator)
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err := types.ReadMessage(bytes.NewBuffer(value), validator)
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if err != nil {
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panic(err)
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}
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validators = append(validators, validator)
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}
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return false
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})
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return
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}
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func MakeValSetChangeTx(pubkey []byte, power int64) []byte {
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return []byte(cmn.Fmt("val:%X/%d", pubkey, power))
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}
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func isValidatorTx(tx []byte) bool {
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return strings.HasPrefix(string(tx), ValidatorSetChangePrefix)
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}
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// format is "val:pubkey1/power1,addr2/power2,addr3/power3"tx
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func (app *PersistentDummyApplication) execValidatorTx(tx []byte) types.ResponseDeliverTx {
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tx = tx[len(ValidatorSetChangePrefix):]
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//get the pubkey and power
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pubKeyAndPower := strings.Split(string(tx), "/")
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if len(pubKeyAndPower) != 2 {
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return types.ResponseDeliverTx{
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Code: code.CodeTypeEncodingError,
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Log: fmt.Sprintf("Expected 'pubkey/power'. Got %v", pubKeyAndPower)}
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}
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pubkeyS, powerS := pubKeyAndPower[0], pubKeyAndPower[1]
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// decode the pubkey, ensuring its go-crypto encoded
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pubkey, err := hex.DecodeString(pubkeyS)
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if err != nil {
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return types.ResponseDeliverTx{
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Code: code.CodeTypeEncodingError,
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Log: fmt.Sprintf("Pubkey (%s) is invalid hex", pubkeyS)}
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}
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_, err = crypto.PubKeyFromBytes(pubkey)
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if err != nil {
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return types.ResponseDeliverTx{
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Code: code.CodeTypeEncodingError,
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Log: fmt.Sprintf("Pubkey (%X) is invalid go-crypto encoded", pubkey)}
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}
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// decode the power
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power, err := strconv.ParseInt(powerS, 10, 64)
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if err != nil {
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return types.ResponseDeliverTx{
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Code: code.CodeTypeEncodingError,
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Log: fmt.Sprintf("Power (%s) is not an int", powerS)}
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}
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// update
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return app.updateValidator(&types.Validator{pubkey, power})
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}
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// add, update, or remove a validator
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func (app *PersistentDummyApplication) updateValidator(v *types.Validator) types.ResponseDeliverTx {
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key := []byte("val:" + string(v.PubKey))
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if v.Power == 0 {
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// remove validator
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if !app.app.state.Has(key) {
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return types.ResponseDeliverTx{
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Code: code.CodeTypeUnauthorized,
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Log: fmt.Sprintf("Cannot remove non-existent validator %X", key)}
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}
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app.app.state.Remove(key)
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} else {
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// add or update validator
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value := bytes.NewBuffer(make([]byte, 0))
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if err := types.WriteMessage(v, value); err != nil {
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return types.ResponseDeliverTx{
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Code: code.CodeTypeEncodingError,
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Log: fmt.Sprintf("Error encoding validator: %v", err)}
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}
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app.app.state.Set(key, value.Bytes())
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}
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// we only update the changes array if we successfully updated the tree
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app.changes = append(app.changes, v)
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return types.ResponseDeliverTx{Code: code.CodeTypeOK}
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}
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