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445 lines
11 KiB
445 lines
11 KiB
package kvstore
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import (
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"bytes"
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"encoding/base64"
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"encoding/binary"
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"encoding/json"
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"fmt"
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"strconv"
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"strings"
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"sync"
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dbm "github.com/tendermint/tm-db"
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"github.com/tendermint/tendermint/abci/example/code"
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"github.com/tendermint/tendermint/abci/types"
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"github.com/tendermint/tendermint/crypto/encoding"
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"github.com/tendermint/tendermint/libs/log"
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cryptoproto "github.com/tendermint/tendermint/proto/tendermint/crypto"
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"github.com/tendermint/tendermint/version"
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)
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var (
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stateKey = []byte("stateKey")
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kvPairPrefixKey = []byte("kvPairKey:")
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ProtocolVersion uint64 = 0x1
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)
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type State struct {
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db dbm.DB
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Size int64 `json:"size"`
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Height int64 `json:"height"`
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AppHash []byte `json:"app_hash"`
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}
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func loadState(db dbm.DB) State {
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var state State
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state.db = db
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stateBytes, err := db.Get(stateKey)
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if err != nil {
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panic(err)
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}
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if len(stateBytes) == 0 {
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return state
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}
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err = json.Unmarshal(stateBytes, &state)
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if err != nil {
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panic(err)
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}
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return state
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}
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func saveState(state State) {
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stateBytes, err := json.Marshal(state)
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if err != nil {
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panic(err)
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}
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err = state.db.Set(stateKey, stateBytes)
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if err != nil {
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panic(err)
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}
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}
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func prefixKey(key []byte) []byte {
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return append(kvPairPrefixKey, key...)
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}
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//---------------------------------------------------
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var _ types.Application = (*Application)(nil)
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type Application struct {
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types.BaseApplication
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mu sync.Mutex
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state State
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RetainBlocks int64 // blocks to retain after commit (via ResponseCommit.RetainHeight)
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logger log.Logger
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// validator set
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ValUpdates []types.ValidatorUpdate
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valAddrToPubKeyMap map[string]cryptoproto.PublicKey
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}
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func NewApplication() *Application {
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return &Application{
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logger: log.NewNopLogger(),
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state: loadState(dbm.NewMemDB()),
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valAddrToPubKeyMap: make(map[string]cryptoproto.PublicKey),
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}
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}
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func (app *Application) InitChain(req types.RequestInitChain) types.ResponseInitChain {
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app.mu.Lock()
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defer app.mu.Unlock()
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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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panic("problem updating validators")
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}
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}
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return types.ResponseInitChain{}
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}
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func (app *Application) Info(req types.RequestInfo) types.ResponseInfo {
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app.mu.Lock()
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defer app.mu.Unlock()
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return types.ResponseInfo{
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Data: fmt.Sprintf("{\"size\":%v}", app.state.Size),
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Version: version.ABCIVersion,
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AppVersion: ProtocolVersion,
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LastBlockHeight: app.state.Height,
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LastBlockAppHash: app.state.AppHash,
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}
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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 *Application) handleTx(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.ValUpdates
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return app.execValidatorTx(tx)
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}
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if isPrepareTx(tx) {
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return app.execPrepareTx(tx)
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}
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var key, value string
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parts := bytes.Split(tx, []byte("="))
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if len(parts) == 2 {
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key, value = string(parts[0]), string(parts[1])
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} else {
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key, value = string(tx), string(tx)
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}
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err := app.state.db.Set(prefixKey([]byte(key)), []byte(value))
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if err != nil {
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panic(err)
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}
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app.state.Size++
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events := []types.Event{
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{
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Type: "app",
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Attributes: []types.EventAttribute{
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{Key: "creator", Value: "Cosmoshi Netowoko", Index: true},
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{Key: "key", Value: key, Index: true},
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{Key: "index_key", Value: "index is working", Index: true},
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{Key: "noindex_key", Value: "index is working", Index: false},
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},
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},
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}
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return &types.ResponseDeliverTx{Code: code.CodeTypeOK, Events: events}
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}
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func (app *Application) Close() error {
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app.mu.Lock()
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defer app.mu.Unlock()
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return app.state.db.Close()
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}
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func (app *Application) FinalizeBlock(req types.RequestFinalizeBlock) types.ResponseFinalizeBlock {
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app.mu.Lock()
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defer app.mu.Unlock()
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// reset valset changes
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app.ValUpdates = make([]types.ValidatorUpdate, 0)
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// Punish validators who committed equivocation.
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for _, ev := range req.ByzantineValidators {
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if ev.Type == types.EvidenceType_DUPLICATE_VOTE {
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addr := string(ev.Validator.Address)
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if pubKey, ok := app.valAddrToPubKeyMap[addr]; ok {
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app.updateValidator(types.ValidatorUpdate{
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PubKey: pubKey,
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Power: ev.Validator.Power - 1,
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})
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app.logger.Info("Decreased val power by 1 because of the equivocation",
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"val", addr)
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} else {
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panic(fmt.Errorf("wanted to punish val %q but can't find it", addr))
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}
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}
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}
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respTxs := make([]*types.ResponseDeliverTx, len(req.Txs))
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for i, tx := range req.Txs {
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respTxs[i] = app.handleTx(tx)
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}
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return types.ResponseFinalizeBlock{Txs: respTxs, ValidatorUpdates: app.ValUpdates}
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}
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func (*Application) CheckTx(req types.RequestCheckTx) types.ResponseCheckTx {
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return types.ResponseCheckTx{Code: code.CodeTypeOK, GasWanted: 1}
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}
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func (app *Application) Commit() types.ResponseCommit {
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app.mu.Lock()
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defer app.mu.Unlock()
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// Using a memdb - just return the big endian size of the db
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appHash := make([]byte, 8)
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binary.PutVarint(appHash, app.state.Size)
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app.state.AppHash = appHash
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app.state.Height++
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saveState(app.state)
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resp := types.ResponseCommit{Data: appHash}
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if app.RetainBlocks > 0 && app.state.Height >= app.RetainBlocks {
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resp.RetainHeight = app.state.Height - app.RetainBlocks + 1
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}
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return resp
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}
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// Returns an associated value or nil if missing.
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func (app *Application) Query(reqQuery types.RequestQuery) types.ResponseQuery {
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app.mu.Lock()
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defer app.mu.Unlock()
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if reqQuery.Path == "/val" {
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key := []byte("val:" + string(reqQuery.Data))
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value, err := app.state.db.Get(key)
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if err != nil {
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panic(err)
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}
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return types.ResponseQuery{
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Key: reqQuery.Data,
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Value: value,
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}
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}
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if reqQuery.Prove {
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value, err := app.state.db.Get(prefixKey(reqQuery.Data))
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if err != nil {
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panic(err)
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}
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resQuery := types.ResponseQuery{
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Index: -1,
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Key: reqQuery.Data,
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Value: value,
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Height: app.state.Height,
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}
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if value == nil {
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resQuery.Log = "does not exist"
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} else {
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resQuery.Log = "exists"
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}
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return resQuery
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}
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value, err := app.state.db.Get(prefixKey(reqQuery.Data))
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if err != nil {
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panic(err)
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}
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resQuery := types.ResponseQuery{
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Key: reqQuery.Data,
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Value: value,
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Height: app.state.Height,
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}
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if value == nil {
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resQuery.Log = "does not exist"
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} else {
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resQuery.Log = "exists"
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}
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return resQuery
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}
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func (app *Application) PrepareProposal(req types.RequestPrepareProposal) types.ResponsePrepareProposal {
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app.mu.Lock()
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defer app.mu.Unlock()
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return types.ResponsePrepareProposal{BlockData: app.substPrepareTx(req.BlockData)}
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}
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func (*Application) ProcessProposal(req types.RequestProcessProposal) types.ResponseProcessProposal {
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for _, tx := range req.Txs {
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if len(tx) == 0 {
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return types.ResponseProcessProposal{Accept: false}
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}
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}
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return types.ResponseProcessProposal{Accept: true}
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}
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//---------------------------------------------
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// update validators
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func (app *Application) Validators() (validators []types.ValidatorUpdate) {
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app.mu.Lock()
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defer app.mu.Unlock()
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itr, err := app.state.db.Iterator(nil, nil)
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if err != nil {
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panic(err)
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}
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for ; itr.Valid(); itr.Next() {
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if isValidatorTx(itr.Key()) {
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validator := new(types.ValidatorUpdate)
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err := types.ReadMessage(bytes.NewBuffer(itr.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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}
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if err = itr.Error(); err != nil {
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panic(err)
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}
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return
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}
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func MakeValSetChangeTx(pubkey cryptoproto.PublicKey, power int64) []byte {
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pk, err := encoding.PubKeyFromProto(pubkey)
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if err != nil {
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panic(err)
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}
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pubStr := base64.StdEncoding.EncodeToString(pk.Bytes())
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return []byte(fmt.Sprintf("val:%s!%d", pubStr, 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:pubkey!power"
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// pubkey is a base64-encoded 32-byte ed25519 key
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func (app *Application) 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
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pubkey, err := base64.StdEncoding.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 base64", pubkeyS)}
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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.UpdateValidator(pubkey, power, ""))
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}
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// add, update, or remove a validator
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func (app *Application) updateValidator(v types.ValidatorUpdate) *types.ResponseDeliverTx {
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pubkey, err := encoding.PubKeyFromProto(v.PubKey)
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if err != nil {
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panic(fmt.Errorf("can't decode public key: %w", err))
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}
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key := []byte("val:" + string(pubkey.Bytes()))
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if v.Power == 0 {
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// remove validator
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hasKey, err := app.state.db.Has(key)
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if err != nil {
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panic(err)
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}
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if !hasKey {
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pubStr := base64.StdEncoding.EncodeToString(pubkey.Bytes())
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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 %s", pubStr)}
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}
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if err = app.state.db.Delete(key); err != nil {
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panic(err)
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}
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delete(app.valAddrToPubKeyMap, string(pubkey.Address()))
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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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if err = app.state.db.Set(key, value.Bytes()); err != nil {
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panic(err)
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}
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app.valAddrToPubKeyMap[string(pubkey.Address())] = v.PubKey
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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.ValUpdates = append(app.ValUpdates, v)
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return &types.ResponseDeliverTx{Code: code.CodeTypeOK}
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}
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// -----------------------------
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// prepare proposal machinery
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const PreparePrefix = "prepare"
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func isPrepareTx(tx []byte) bool {
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return strings.HasPrefix(string(tx), PreparePrefix)
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}
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// execPrepareTx is noop. tx data is considered as placeholder
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// and is substitute at the PrepareProposal.
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func (app *Application) execPrepareTx(tx []byte) *types.ResponseDeliverTx {
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// noop
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return &types.ResponseDeliverTx{}
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}
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// substPrepareTx subst all the preparetx in the blockdata
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// to null string(could be any arbitrary string).
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func (app *Application) substPrepareTx(blockData [][]byte) [][]byte {
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// TODO: this mechanism will change with the current spec of PrepareProposal
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// We now have a special type for marking a tx as changed
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for i, tx := range blockData {
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if isPrepareTx(tx) {
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blockData[i] = make([]byte, len(tx))
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}
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}
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return blockData
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}
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