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baseapp.go
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baseapp.go
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package baseapp
import (
"fmt"
"io"
"runtime/debug"
"strings"
"github.com/pkg/errors"
abci "github.com/tendermint/tendermint/abci/types"
"github.com/tendermint/tendermint/crypto/tmhash"
cmn "github.com/tendermint/tendermint/libs/common"
dbm "github.com/tendermint/tendermint/libs/db"
"github.com/tendermint/tendermint/libs/log"
"github.com/cosmos/cosmos-sdk/store"
sdk "github.com/cosmos/cosmos-sdk/types"
"github.com/cosmos/cosmos-sdk/version"
"github.com/cosmos/cosmos-sdk/wire"
"github.com/cosmos/cosmos-sdk/x/auth"
)
// Key to store the header in the DB itself.
// Use the db directly instead of a store to avoid
// conflicts with handlers writing to the store
// and to avoid affecting the Merkle root.
var dbHeaderKey = []byte("header")
// Enum mode for app.runTx
type runTxMode uint8
const (
// Check a transaction
runTxModeCheck runTxMode = iota
// Simulate a transaction
runTxModeSimulate runTxMode = iota
// Deliver a transaction
runTxModeDeliver runTxMode = iota
)
// BaseApp reflects the ABCI application implementation.
type BaseApp struct {
// initialized on creation
Logger log.Logger
name string // application name from abci.Info
cdc *wire.Codec // Amino codec
db dbm.DB // common DB backend
cms sdk.CommitMultiStore // Main (uncached) state
router Router // handle any kind of message
codespacer *sdk.Codespacer // handle module codespacing
// must be set
txDecoder sdk.TxDecoder // unmarshal []byte into sdk.Tx
anteHandler sdk.AnteHandler // ante handler for fee and auth
// may be nil
initChainer sdk.InitChainer // initialize state with validators and state blob
beginBlocker sdk.BeginBlocker // logic to run before any txs
endBlocker sdk.EndBlocker // logic to run after all txs, and to determine valset changes
addrPeerFilter sdk.PeerFilter // filter peers by address and port
pubkeyPeerFilter sdk.PeerFilter // filter peers by public key
//--------------------
// Volatile
// checkState is set on initialization and reset on Commit.
// deliverState is set in InitChain and BeginBlock and cleared on Commit.
// See methods setCheckState and setDeliverState.
checkState *state // for CheckTx
deliverState *state // for DeliverTx
signedValidators []abci.SigningValidator // absent validators from begin block
}
var _ abci.Application = (*BaseApp)(nil)
// NewBaseApp returns a reference to an initialized BaseApp.
//
// TODO: Determine how to use a flexible and robust configuration paradigm that
// allows for sensible defaults while being highly configurable
// (e.g. functional options).
//
// NOTE: The db is used to store the version number for now.
// Accepts variable number of option functions, which act on the BaseApp to set configuration choices
func NewBaseApp(name string, cdc *wire.Codec, logger log.Logger, db dbm.DB, options ...func(*BaseApp)) *BaseApp {
app := &BaseApp{
Logger: logger,
name: name,
cdc: cdc,
db: db,
cms: store.NewCommitMultiStore(db),
router: NewRouter(),
codespacer: sdk.NewCodespacer(),
txDecoder: defaultTxDecoder(cdc),
}
// Register the undefined & root codespaces, which should not be used by
// any modules.
app.codespacer.RegisterOrPanic(sdk.CodespaceRoot)
for _, option := range options {
option(app)
}
return app
}
// BaseApp Name
func (app *BaseApp) Name() string {
return app.name
}
// SetCommitMultiStoreTracer sets the store tracer on the BaseApp's underlying
// CommitMultiStore.
func (app *BaseApp) SetCommitMultiStoreTracer(w io.Writer) {
app.cms.WithTracer(w)
}
// Register the next available codespace through the baseapp's codespacer, starting from a default
func (app *BaseApp) RegisterCodespace(codespace sdk.CodespaceType) sdk.CodespaceType {
return app.codespacer.RegisterNext(codespace)
}
// Mount a store to the provided key in the BaseApp multistore
func (app *BaseApp) MountStoresIAVL(keys ...*sdk.KVStoreKey) {
for _, key := range keys {
app.MountStore(key, sdk.StoreTypeIAVL)
}
}
// Mount a store to the provided key in the BaseApp multistore, using a specified DB
func (app *BaseApp) MountStoreWithDB(key sdk.StoreKey, typ sdk.StoreType, db dbm.DB) {
app.cms.MountStoreWithDB(key, typ, db)
}
// Mount a store to the provided key in the BaseApp multistore, using the default DB
func (app *BaseApp) MountStore(key sdk.StoreKey, typ sdk.StoreType) {
app.cms.MountStoreWithDB(key, typ, nil)
}
// Set the txDecoder function
func (app *BaseApp) SetTxDecoder(txDecoder sdk.TxDecoder) {
app.txDecoder = txDecoder
}
// default custom logic for transaction decoding
// TODO: remove auth and wire dependencies from baseapp
// - move this to auth.DefaultTxDecoder
// - set the default here to JSON decode like docs/examples/app1 (it will fail
// for multiple messages ;))
// - pass a TxDecoder into NewBaseApp, instead of a codec.
func defaultTxDecoder(cdc *wire.Codec) sdk.TxDecoder {
return func(txBytes []byte) (sdk.Tx, sdk.Error) {
var tx = auth.StdTx{}
if len(txBytes) == 0 {
return nil, sdk.ErrTxDecode("txBytes are empty")
}
// StdTx.Msg is an interface. The concrete types
// are registered by MakeTxCodec
err := cdc.UnmarshalBinary(txBytes, &tx)
if err != nil {
return nil, sdk.ErrTxDecode("").TraceSDK(err.Error())
}
return tx, nil
}
}
// nolint - Set functions
func (app *BaseApp) SetInitChainer(initChainer sdk.InitChainer) {
app.initChainer = initChainer
}
func (app *BaseApp) SetBeginBlocker(beginBlocker sdk.BeginBlocker) {
app.beginBlocker = beginBlocker
}
func (app *BaseApp) SetEndBlocker(endBlocker sdk.EndBlocker) {
app.endBlocker = endBlocker
}
func (app *BaseApp) SetAnteHandler(ah sdk.AnteHandler) {
app.anteHandler = ah
}
func (app *BaseApp) SetAddrPeerFilter(pf sdk.PeerFilter) {
app.addrPeerFilter = pf
}
func (app *BaseApp) SetPubKeyPeerFilter(pf sdk.PeerFilter) {
app.pubkeyPeerFilter = pf
}
func (app *BaseApp) Router() Router { return app.router }
// load latest application version
func (app *BaseApp) LoadLatestVersion(mainKey sdk.StoreKey) error {
err := app.cms.LoadLatestVersion()
if err != nil {
return err
}
return app.initFromStore(mainKey)
}
// load application version
func (app *BaseApp) LoadVersion(version int64, mainKey sdk.StoreKey) error {
err := app.cms.LoadVersion(version)
if err != nil {
return err
}
return app.initFromStore(mainKey)
}
// the last CommitID of the multistore
func (app *BaseApp) LastCommitID() sdk.CommitID {
return app.cms.LastCommitID()
}
// the last committed block height
func (app *BaseApp) LastBlockHeight() int64 {
return app.cms.LastCommitID().Version
}
// initializes the remaining logic from app.cms
func (app *BaseApp) initFromStore(mainKey sdk.StoreKey) error {
// main store should exist.
// TODO: we don't actually need the main store here
main := app.cms.GetKVStore(mainKey)
if main == nil {
return errors.New("baseapp expects MultiStore with 'main' KVStore")
}
return nil
}
// NewContext returns a new Context with the correct store, the given header, and nil txBytes.
func (app *BaseApp) NewContext(isCheckTx bool, header abci.Header) sdk.Context {
if isCheckTx {
return sdk.NewContext(app.checkState.ms, header, true, app.Logger)
}
return sdk.NewContext(app.deliverState.ms, header, false, app.Logger)
}
type state struct {
ms sdk.CacheMultiStore
ctx sdk.Context
}
func (st *state) CacheMultiStore() sdk.CacheMultiStore {
return st.ms.CacheMultiStore()
}
func (app *BaseApp) setCheckState(header abci.Header) {
ms := app.cms.CacheMultiStore()
app.checkState = &state{
ms: ms,
ctx: sdk.NewContext(ms, header, true, app.Logger),
}
}
func (app *BaseApp) setDeliverState(header abci.Header) {
ms := app.cms.CacheMultiStore()
app.deliverState = &state{
ms: ms,
ctx: sdk.NewContext(ms, header, false, app.Logger),
}
}
//______________________________________________________________________________
// ABCI
// Implements ABCI
func (app *BaseApp) Info(req abci.RequestInfo) abci.ResponseInfo {
lastCommitID := app.cms.LastCommitID()
return abci.ResponseInfo{
Data: app.name,
LastBlockHeight: lastCommitID.Version,
LastBlockAppHash: lastCommitID.Hash,
}
}
// Implements ABCI
func (app *BaseApp) SetOption(req abci.RequestSetOption) (res abci.ResponseSetOption) {
// TODO: Implement
return
}
// Implements ABCI
// InitChain runs the initialization logic directly on the CommitMultiStore and commits it.
func (app *BaseApp) InitChain(req abci.RequestInitChain) (res abci.ResponseInitChain) {
// Initialize the deliver state and check state with ChainID and run initChain
app.setDeliverState(abci.Header{ChainID: req.ChainId})
app.setCheckState(abci.Header{ChainID: req.ChainId})
if app.initChainer == nil {
return
}
app.initChainer(app.deliverState.ctx, req) // no error
// NOTE: we don't commit, but BeginBlock for block 1
// starts from this deliverState
return
}
// Filter peers by address / port
func (app *BaseApp) FilterPeerByAddrPort(info string) abci.ResponseQuery {
if app.addrPeerFilter != nil {
return app.addrPeerFilter(info)
}
return abci.ResponseQuery{}
}
// Filter peers by public key
func (app *BaseApp) FilterPeerByPubKey(info string) abci.ResponseQuery {
if app.pubkeyPeerFilter != nil {
return app.pubkeyPeerFilter(info)
}
return abci.ResponseQuery{}
}
func splitPath(requestPath string) (path []string) {
path = strings.Split(requestPath, "/")
// first element is empty string
if len(path) > 0 && path[0] == "" {
path = path[1:]
}
return path
}
// Implements ABCI.
// Delegates to CommitMultiStore if it implements Queryable
func (app *BaseApp) Query(req abci.RequestQuery) (res abci.ResponseQuery) {
path := splitPath(req.Path)
if len(path) == 0 {
msg := "no query path provided"
return sdk.ErrUnknownRequest(msg).QueryResult()
}
switch path[0] {
// "/app" prefix for special application queries
case "app":
return handleQueryApp(app, path, req)
case "store":
return handleQueryStore(app, path, req)
case "p2p":
return handleQueryP2P(app, path, req)
}
msg := "unknown query path"
return sdk.ErrUnknownRequest(msg).QueryResult()
}
func handleQueryApp(app *BaseApp, path []string, req abci.RequestQuery) (res abci.ResponseQuery) {
if len(path) >= 2 {
var result sdk.Result
switch path[1] {
case "simulate":
txBytes := req.Data
tx, err := app.txDecoder(txBytes)
if err != nil {
result = err.Result()
} else {
result = app.Simulate(tx)
}
case "version":
return abci.ResponseQuery{
Code: uint32(sdk.ABCICodeOK),
Value: []byte(version.GetVersion()),
}
default:
result = sdk.ErrUnknownRequest(fmt.Sprintf("Unknown query: %s", path)).Result()
}
value := app.cdc.MustMarshalBinary(result)
return abci.ResponseQuery{
Code: uint32(sdk.ABCICodeOK),
Value: value,
}
}
msg := "Expected second parameter to be either simulate or version, neither was present"
return sdk.ErrUnknownRequest(msg).QueryResult()
}
func handleQueryStore(app *BaseApp, path []string, req abci.RequestQuery) (res abci.ResponseQuery) {
// "/store" prefix for store queries
queryable, ok := app.cms.(sdk.Queryable)
if !ok {
msg := "multistore doesn't support queries"
return sdk.ErrUnknownRequest(msg).QueryResult()
}
req.Path = "/" + strings.Join(path[1:], "/")
return queryable.Query(req)
}
func handleQueryP2P(app *BaseApp, path []string, req abci.RequestQuery) (res abci.ResponseQuery) {
// "/p2p" prefix for p2p queries
if len(path) >= 4 {
if path[1] == "filter" {
if path[2] == "addr" {
return app.FilterPeerByAddrPort(path[3])
}
if path[2] == "pubkey" {
// TODO: this should be changed to `id`
// NOTE: this changed in tendermint and we didn't notice...
return app.FilterPeerByPubKey(path[3])
}
} else {
msg := "Expected second parameter to be filter"
return sdk.ErrUnknownRequest(msg).QueryResult()
}
}
msg := "Expected path is p2p filter <addr|pubkey> <parameter>"
return sdk.ErrUnknownRequest(msg).QueryResult()
}
// BeginBlock implements the ABCI application interface.
func (app *BaseApp) BeginBlock(req abci.RequestBeginBlock) (res abci.ResponseBeginBlock) {
if app.cms.TracingEnabled() {
app.cms.ResetTraceContext()
app.cms.WithTracingContext(sdk.TraceContext(
map[string]interface{}{"blockHeight": req.Header.Height},
))
}
// Initialize the DeliverTx state. If this is the first block, it should
// already be initialized in InitChain. Otherwise app.deliverState will be
// nil, since it is reset on Commit.
if app.deliverState == nil {
app.setDeliverState(req.Header)
} else {
// In the first block, app.deliverState.ctx will already be initialized
// by InitChain. Context is now updated with Header information.
app.deliverState.ctx = app.deliverState.ctx.WithBlockHeader(req.Header)
}
if app.beginBlocker != nil {
res = app.beginBlocker(app.deliverState.ctx, req)
}
// set the signed validators for addition to context in deliverTx
app.signedValidators = req.Validators
return
}
// Implements ABCI
func (app *BaseApp) CheckTx(txBytes []byte) (res abci.ResponseCheckTx) {
// Decode the Tx.
var result sdk.Result
var tx, err = app.txDecoder(txBytes)
if err != nil {
result = err.Result()
} else {
result = app.runTx(runTxModeCheck, txBytes, tx)
}
return abci.ResponseCheckTx{
Code: uint32(result.Code),
Data: result.Data,
Log: result.Log,
GasWanted: result.GasWanted,
GasUsed: result.GasUsed,
Fee: cmn.KI64Pair{
[]byte(result.FeeDenom),
result.FeeAmount,
},
Tags: result.Tags,
}
}
// Implements ABCI
func (app *BaseApp) DeliverTx(txBytes []byte) (res abci.ResponseDeliverTx) {
// Decode the Tx.
var result sdk.Result
var tx, err = app.txDecoder(txBytes)
if err != nil {
result = err.Result()
} else {
result = app.runTx(runTxModeDeliver, txBytes, tx)
}
// Even though the Result.Code is not OK, there are still effects,
// namely fee deductions and sequence incrementing.
// Tell the blockchain engine (i.e. Tendermint).
return abci.ResponseDeliverTx{
Code: uint32(result.Code),
Data: result.Data,
Log: result.Log,
GasWanted: result.GasWanted,
GasUsed: result.GasUsed,
Tags: result.Tags,
}
}
// Basic validator for msgs
func validateBasicTxMsgs(msgs []sdk.Msg) sdk.Error {
if msgs == nil || len(msgs) == 0 {
// TODO: probably shouldn't be ErrInternal. Maybe new ErrInvalidMessage, or ?
return sdk.ErrInternal("Tx.GetMsgs() must return at least one message in list")
}
for _, msg := range msgs {
// Validate the Msg.
err := msg.ValidateBasic()
if err != nil {
err = err.WithDefaultCodespace(sdk.CodespaceRoot)
return err
}
}
return nil
}
func (app *BaseApp) getContextForAnte(mode runTxMode, txBytes []byte) (ctx sdk.Context) {
// Get the context
if mode == runTxModeCheck || mode == runTxModeSimulate {
ctx = app.checkState.ctx.WithTxBytes(txBytes)
} else {
ctx = app.deliverState.ctx.WithTxBytes(txBytes)
ctx = ctx.WithSigningValidators(app.signedValidators)
}
// Simulate a DeliverTx for gas calculation
if mode == runTxModeSimulate {
ctx = ctx.WithIsCheckTx(false)
}
return
}
// Iterates through msgs and executes them
func (app *BaseApp) runMsgs(ctx sdk.Context, msgs []sdk.Msg) (result sdk.Result) {
// accumulate results
logs := make([]string, 0, len(msgs))
var data []byte // NOTE: we just append them all (?!)
var tags sdk.Tags // also just append them all
var code sdk.ABCICodeType
for msgIdx, msg := range msgs {
// Match route.
msgType := msg.Type()
handler := app.router.Route(msgType)
if handler == nil {
return sdk.ErrUnknownRequest("Unrecognized Msg type: " + msgType).Result()
}
msgResult := handler(ctx, msg)
// NOTE: GasWanted is determined by ante handler and
// GasUsed by the GasMeter
// Append Data and Tags
data = append(data, msgResult.Data...)
tags = append(tags, msgResult.Tags...)
// Stop execution and return on first failed message.
if !msgResult.IsOK() {
logs = append(logs, fmt.Sprintf("Msg %d failed: %s", msgIdx, msgResult.Log))
code = msgResult.Code
break
}
// Construct usable logs in multi-message transactions.
logs = append(logs, fmt.Sprintf("Msg %d: %s", msgIdx, msgResult.Log))
}
// Set the final gas values.
result = sdk.Result{
Code: code,
Data: data,
Log: strings.Join(logs, "\n"),
GasUsed: ctx.GasMeter().GasConsumed(),
// TODO: FeeAmount/FeeDenom
Tags: tags,
}
return result
}
// Returns the applicantion's deliverState if app is in runTxModeDeliver,
// otherwise it returns the application's checkstate.
func getState(app *BaseApp, mode runTxMode) *state {
if mode == runTxModeCheck || mode == runTxModeSimulate {
return app.checkState
}
return app.deliverState
}
// runTx processes a transaction. The transactions is proccessed via an
// anteHandler. txBytes may be nil in some cases, eg. in tests. Also, in the
// future we may support "internal" transactions.
func (app *BaseApp) runTx(mode runTxMode, txBytes []byte, tx sdk.Tx) (result sdk.Result) {
// NOTE: GasWanted should be returned by the AnteHandler. GasUsed is
// determined by the GasMeter. We need access to the context to get the gas
// meter so we initialize upfront.
var gasWanted int64
ctx := app.getContextForAnte(mode, txBytes)
defer func() {
if r := recover(); r != nil {
switch rType := r.(type) {
case sdk.ErrorOutOfGas:
log := fmt.Sprintf("out of gas in location: %v", rType.Descriptor)
result = sdk.ErrOutOfGas(log).Result()
default:
log := fmt.Sprintf("recovered: %v\nstack:\n%v", r, string(debug.Stack()))
result = sdk.ErrInternal(log).Result()
}
}
result.GasWanted = gasWanted
result.GasUsed = ctx.GasMeter().GasConsumed()
}()
var msgs = tx.GetMsgs()
err := validateBasicTxMsgs(msgs)
if err != nil {
return err.Result()
}
// run the ante handler
if app.anteHandler != nil {
newCtx, anteResult, abort := app.anteHandler(ctx, tx)
if abort {
return anteResult
}
if !newCtx.IsZero() {
ctx = newCtx
}
gasWanted = result.GasWanted
}
// Keep the state in a transient CacheWrap in case processing the messages
// fails.
msCache := getState(app, mode).CacheMultiStore()
if msCache.TracingEnabled() {
msCache = msCache.WithTracingContext(sdk.TraceContext(
map[string]interface{}{"txHash": cmn.HexBytes(tmhash.Sum(txBytes)).String()},
)).(sdk.CacheMultiStore)
}
ctx = ctx.WithMultiStore(msCache)
result = app.runMsgs(ctx, msgs)
result.GasWanted = gasWanted
// only update state if all messages pass and we're not in a simulation
if result.IsOK() && mode != runTxModeSimulate {
msCache.Write()
}
return
}
// EndBlock implements the ABCI application interface.
func (app *BaseApp) EndBlock(req abci.RequestEndBlock) (res abci.ResponseEndBlock) {
if app.deliverState.ms.TracingEnabled() {
app.deliverState.ms = app.deliverState.ms.ResetTraceContext().(sdk.CacheMultiStore)
}
if app.endBlocker != nil {
res = app.endBlocker(app.deliverState.ctx, req)
}
return
}
// Implements ABCI
func (app *BaseApp) Commit() (res abci.ResponseCommit) {
header := app.deliverState.ctx.BlockHeader()
/*
// Write the latest Header to the store
headerBytes, err := proto.Marshal(&header)
if err != nil {
panic(err)
}
app.db.SetSync(dbHeaderKey, headerBytes)
*/
// Write the Deliver state and commit the MultiStore
app.deliverState.ms.Write()
commitID := app.cms.Commit()
// TODO: this is missing a module identifier and dumps byte array
app.Logger.Debug("Commit synced",
"commit", commitID,
)
// Reset the Check state to the latest committed
// NOTE: safe because Tendermint holds a lock on the mempool for Commit.
// Use the header from this latest block.
app.setCheckState(header)
// Empty the Deliver state
app.deliverState = nil
return abci.ResponseCommit{
Data: commitID.Hash,
}
}