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217 lines
6.2 KiB
217 lines
6.2 KiB
package main
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import (
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"bytes"
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"encoding/base64"
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"errors"
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"fmt"
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"os"
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"path/filepath"
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"github.com/tendermint/tendermint/abci/example/code"
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abci "github.com/tendermint/tendermint/abci/types"
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"github.com/tendermint/tendermint/libs/log"
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"github.com/tendermint/tendermint/version"
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)
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// Application is an ABCI application for use by end-to-end tests. It is a
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// simple key/value store for strings, storing data in memory and persisting
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// to disk as JSON, taking state sync snapshots if requested.
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type Application struct {
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abci.BaseApplication
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logger log.Logger
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state *State
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snapshots *SnapshotStore
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cfg *Config
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restoreSnapshot *abci.Snapshot
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restoreChunks [][]byte
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}
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// NewApplication creates the application.
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func NewApplication(cfg *Config) (*Application, error) {
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state, err := NewState(filepath.Join(cfg.Dir, "state.json"), cfg.PersistInterval)
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if err != nil {
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return nil, err
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}
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snapshots, err := NewSnapshotStore(filepath.Join(cfg.Dir, "snapshots"))
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if err != nil {
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return nil, err
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}
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return &Application{
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logger: log.NewTMLogger(log.NewSyncWriter(os.Stdout)),
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state: state,
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snapshots: snapshots,
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cfg: cfg,
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}, nil
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}
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// Info implements ABCI.
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func (app *Application) Info(req abci.RequestInfo) abci.ResponseInfo {
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return abci.ResponseInfo{
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Version: version.ABCIVersion,
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AppVersion: 1,
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LastBlockHeight: int64(app.state.Height),
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LastBlockAppHash: app.state.Hash,
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}
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}
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// Info implements ABCI.
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func (app *Application) InitChain(req abci.RequestInitChain) abci.ResponseInitChain {
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var err error
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app.state.initialHeight = uint64(req.InitialHeight)
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if len(req.AppStateBytes) > 0 {
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err = app.state.Import(0, req.AppStateBytes)
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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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resp := abci.ResponseInitChain{
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AppHash: app.state.Hash,
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}
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if resp.Validators, err = app.validatorUpdates(0); err != nil {
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panic(err)
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}
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return resp
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}
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// CheckTx implements ABCI.
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func (app *Application) CheckTx(req abci.RequestCheckTx) abci.ResponseCheckTx {
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_, _, err := parseTx(req.Tx)
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if err != nil {
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return abci.ResponseCheckTx{
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Code: code.CodeTypeEncodingError,
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Log: err.Error(),
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}
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}
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return abci.ResponseCheckTx{Code: code.CodeTypeOK, GasWanted: 1}
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}
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// DeliverTx implements ABCI.
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func (app *Application) DeliverTx(req abci.RequestDeliverTx) abci.ResponseDeliverTx {
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key, value, err := parseTx(req.Tx)
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if err != nil {
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panic(err) // shouldn't happen since we verified it in CheckTx
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}
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app.state.Set(key, value)
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return abci.ResponseDeliverTx{Code: code.CodeTypeOK}
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}
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// EndBlock implements ABCI.
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func (app *Application) EndBlock(req abci.RequestEndBlock) abci.ResponseEndBlock {
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var err error
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resp := abci.ResponseEndBlock{}
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if resp.ValidatorUpdates, err = app.validatorUpdates(uint64(req.Height)); err != nil {
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panic(err)
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}
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return resp
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}
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// Commit implements ABCI.
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func (app *Application) Commit() abci.ResponseCommit {
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height, hash, err := app.state.Commit()
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if err != nil {
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panic(err)
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}
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if app.cfg.SnapshotInterval > 0 && height%app.cfg.SnapshotInterval == 0 {
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snapshot, err := app.snapshots.Create(app.state)
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if err != nil {
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panic(err)
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}
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logger.Info("Created state sync snapshot", "height", snapshot.Height)
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}
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retainHeight := int64(0)
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if app.cfg.RetainBlocks > 0 {
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retainHeight = int64(height - app.cfg.RetainBlocks + 1)
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}
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return abci.ResponseCommit{
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Data: hash,
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RetainHeight: retainHeight,
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}
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}
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// Query implements ABCI.
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func (app *Application) Query(req abci.RequestQuery) abci.ResponseQuery {
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return abci.ResponseQuery{
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Height: int64(app.state.Height),
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Key: req.Data,
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Value: []byte(app.state.Get(string(req.Data))),
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}
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}
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// ListSnapshots implements ABCI.
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func (app *Application) ListSnapshots(req abci.RequestListSnapshots) abci.ResponseListSnapshots {
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snapshots, err := app.snapshots.List()
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if err != nil {
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panic(err)
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}
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return abci.ResponseListSnapshots{Snapshots: snapshots}
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}
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// LoadSnapshotChunk implements ABCI.
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func (app *Application) LoadSnapshotChunk(req abci.RequestLoadSnapshotChunk) abci.ResponseLoadSnapshotChunk {
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chunk, err := app.snapshots.LoadChunk(req.Height, req.Format, req.Chunk)
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if err != nil {
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panic(err)
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}
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return abci.ResponseLoadSnapshotChunk{Chunk: chunk}
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}
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// OfferSnapshot implements ABCI.
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func (app *Application) OfferSnapshot(req abci.RequestOfferSnapshot) abci.ResponseOfferSnapshot {
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if app.restoreSnapshot != nil {
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panic("A snapshot is already being restored")
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}
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app.restoreSnapshot = req.Snapshot
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app.restoreChunks = [][]byte{}
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return abci.ResponseOfferSnapshot{Result: abci.ResponseOfferSnapshot_ACCEPT}
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}
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// ApplySnapshotChunk implements ABCI.
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func (app *Application) ApplySnapshotChunk(req abci.RequestApplySnapshotChunk) abci.ResponseApplySnapshotChunk {
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if app.restoreSnapshot == nil {
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panic("No restore in progress")
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}
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app.restoreChunks = append(app.restoreChunks, req.Chunk)
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if len(app.restoreChunks) == int(app.restoreSnapshot.Chunks) {
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bz := []byte{}
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for _, chunk := range app.restoreChunks {
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bz = append(bz, chunk...)
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}
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err := app.state.Import(app.restoreSnapshot.Height, bz)
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if err != nil {
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panic(err)
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}
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app.restoreSnapshot = nil
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app.restoreChunks = nil
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}
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return abci.ResponseApplySnapshotChunk{Result: abci.ResponseApplySnapshotChunk_ACCEPT}
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}
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// validatorUpdates generates a validator set update.
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func (app *Application) validatorUpdates(height uint64) (abci.ValidatorUpdates, error) {
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updates := app.cfg.ValidatorUpdates[fmt.Sprintf("%v", height)]
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if len(updates) == 0 {
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return nil, nil
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}
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valUpdates := abci.ValidatorUpdates{}
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for keyString, power := range updates {
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keyBytes, err := base64.StdEncoding.DecodeString(keyString)
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if err != nil {
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return nil, fmt.Errorf("invalid base64 pubkey value %q: %w", keyString, err)
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}
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valUpdates = append(valUpdates, abci.Ed25519ValidatorUpdate(keyBytes, int64(power)))
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}
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return valUpdates, nil
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}
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// parseTx parses a tx in 'key=value' format into a key and value.
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func parseTx(tx []byte) (string, string, error) {
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parts := bytes.Split(tx, []byte("="))
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if len(parts) != 2 {
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return "", "", fmt.Errorf("invalid tx format: %q", string(tx))
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}
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if len(parts[0]) == 0 {
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return "", "", errors.New("key cannot be empty")
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}
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return string(parts[0]), string(parts[1]), nil
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}
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