2017-10-16 10:21:43 -07:00
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package app
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import (
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2017-12-01 09:10:17 -08:00
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"bytes"
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"fmt"
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"os"
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"github.com/golang/protobuf/proto"
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"github.com/pkg/errors"
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abci "github.com/tendermint/abci/types"
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cmn "github.com/tendermint/tmlibs/common"
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"github.com/tendermint/tmlibs/log"
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sdk "github.com/cosmos/cosmos-sdk"
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"github.com/cosmos/cosmos-sdk/util"
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)
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const mainKeyHeader = "header"
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// BaseApp - The ABCI application
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type BaseApp struct {
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logger log.Logger
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// App name from abci.Info
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name string
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// DeliverTx (main) state
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ms MultiStore
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// CheckTx state
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msCheck CacheMultiStore
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// Cached validator changes from DeliverTx
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pending []*abci.Validator
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// Parser for the tx.
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txParser sdk.TxParser
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// Handler for CheckTx and DeliverTx.
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handler sdk.Handler
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}
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var _ abci.Application = &BaseApp{}
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// CONTRACT: There exists a "main" KVStore.
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func NewBaseApp(name string, ms MultiStore) (*BaseApp, error) {
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if ms.GetKVStore("main") == nil {
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return nil, errors.New("BaseApp expects MultiStore with 'main' KVStore")
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}
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logger := makeDefaultLogger()
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lastCommitID := ms.LastCommitID()
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curVersion := ms.CurrentVersion()
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main := ms.GetKVStore("main")
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header := (*abci.Header)(nil)
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msCheck := ms.CacheMultiStore()
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// SANITY
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if curVersion != lastCommitID.Version+1 {
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panic("CurrentVersion != LastCommitID.Version+1")
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}
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// If we've committed before, we expect ms.GetKVStore("main").Get("header")
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if !lastCommitID.IsZero() {
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headerBytes, ok := main.Get(mainKeyHeader)
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if !ok {
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return nil, errors.New(fmt.Sprintf("Version > 0 but missing key %s", mainKeyHeader))
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}
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err = proto.Unmarshal(headerBytes, header)
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if err != nil {
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return nil, errors.Wrap(err, "Failed to parse Header")
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}
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// SANITY: Validate Header
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if header.Height != curVersion-1 {
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errStr := fmt.Sprintf("Expected header.Height %v but got %v", version, headerHeight)
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panic(errStr)
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}
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}
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return &BaseApp{
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logger: logger,
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name: name,
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ms: ms,
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msCheck: msCheck,
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pending: nil,
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header: header,
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}
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}
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func (app *BaseApp) SetTxParser(parser TxParser) {
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app.txParser = parser
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}
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func (app *BaseApp) SetHandler(handler sdk.Handler) {
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app.handler = handler
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}
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//----------------------------------------
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// DeliverTx - ABCI - dispatches to the handler
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func (app *BaseApp) DeliverTx(txBytes []byte) abci.ResponseDeliverTx {
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// TODO: use real context on refactor
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ctx := util.MockContext(
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app.GetChainID(),
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app.WorkingHeight(),
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)
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// Parse the transaction
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tx, err := app.parseTxFn(ctx, txBytes)
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if err != nil {
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err := sdk.TxParseError("").WithCause(err)
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return sdk.ResponseDeliverTxFromErr(err)
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}
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// Make handler deal with it
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data, err := app.handler.DeliverTx(ctx, app.ms, tx)
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if err != nil {
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return sdk.ResponseDeliverTxFromErr(err)
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}
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app.AddValChange(res.Diff)
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return abci.ResponseDeliverTx{
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Code: abci.CodeType_OK,
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Data: data,
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Log: "", // TODO add log from ctx.logger
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}
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}
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// CheckTx - ABCI - dispatches to the handler
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func (app *BaseApp) CheckTx(txBytes []byte) abci.ResponseCheckTx {
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// TODO: use real context on refactor
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ctx := util.MockContext(
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app.GetChainID(),
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app.WorkingHeight(),
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)
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// Parse the transaction
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tx, err := app.parseTxFn(ctx, txBytes)
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if err != nil {
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err := sdk.TxParseError("").WithCause(err)
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return sdk.ResponseCheckTxFromErr(err)
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}
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// Make handler deal with it
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data, err := app.handler.CheckTx(ctx, app.ms, tx)
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if err != nil {
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return sdk.ResponseCheckTx(err)
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}
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return abci.ResponseCheckTx{
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Code: abci.CodeType_OK,
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Data: data,
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Log: "", // TODO add log from ctx.logger
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}
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}
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// Info - ABCI
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func (app *BaseApp) Info(req abci.RequestInfo) abci.ResponseInfo {
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lastCommitID := app.ms.LastCommitID()
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return abci.ResponseInfo{
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Data: app.Name,
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LastBlockHeight: lastCommitID.Version,
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LastBlockAppHash: lastCommitID.Hash,
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}
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}
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// SetOption - ABCI
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func (app *StoreApp) SetOption(key string, value string) string {
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return "Not Implemented"
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}
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// Query - ABCI
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func (app *StoreApp) Query(reqQuery abci.RequestQuery) (resQuery abci.ResponseQuery) {
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/* TODO
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if len(reqQuery.Data) == 0 {
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resQuery.Log = "Query cannot be zero length"
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resQuery.Code = abci.CodeType_EncodingError
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return
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}
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// set the query response height to current
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tree := app.state.Committed()
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height := reqQuery.Height
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if height == 0 {
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// TODO: once the rpc actually passes in non-zero
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// heights we can use to query right after a tx
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// we must retrun most recent, even if apphash
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// is not yet in the blockchain
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withProof := app.CommittedHeight() - 1
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if tree.Tree.VersionExists(withProof) {
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height = withProof
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} else {
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height = app.CommittedHeight()
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}
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}
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resQuery.Height = height
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switch reqQuery.Path {
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case "/store", "/key": // Get by key
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key := reqQuery.Data // Data holds the key bytes
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resQuery.Key = key
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if reqQuery.Prove {
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value, proof, err := tree.GetVersionedWithProof(key, height)
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if err != nil {
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resQuery.Log = err.Error()
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break
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}
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resQuery.Value = value
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resQuery.Proof = proof.Bytes()
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} else {
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value := tree.Get(key)
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resQuery.Value = value
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}
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default:
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resQuery.Code = abci.CodeType_UnknownRequest
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resQuery.Log = cmn.Fmt("Unexpected Query path: %v", reqQuery.Path)
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}
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return
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*/
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}
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// Commit implements abci.Application
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func (app *StoreApp) Commit() (res abci.Result) {
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/*
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hash, err := app.state.Commit(app.height)
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if err != nil {
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// die if we can't commit, not to recover
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panic(err)
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}
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app.logger.Debug("Commit synced",
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"height", app.height,
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"hash", fmt.Sprintf("%X", hash),
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)
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if app.state.Size() == 0 {
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return abci.NewResultOK(nil, "Empty hash for empty tree")
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}
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return abci.NewResultOK(hash, "")
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*/
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}
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// InitChain - ABCI
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func (app *StoreApp) InitChain(req abci.RequestInitChain) {}
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// BeginBlock - ABCI
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func (app *StoreApp) BeginBlock(req abci.RequestBeginBlock) {
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// TODO
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}
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// EndBlock - ABCI
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// Returns a list of all validator changes made in this block
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func (app *StoreApp) EndBlock(height uint64) (res abci.ResponseEndBlock) {
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// TODO: cleanup in case a validator exists multiple times in the list
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res.Diffs = app.pending
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app.pending = nil
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return
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}
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// AddValChange is meant to be called by apps on DeliverTx
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// results, this is added to the cache for the endblock
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// changeset
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func (app *StoreApp) AddValChange(diffs []*abci.Validator) {
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for _, d := range diffs {
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idx := pubKeyIndex(d, app.pending)
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if idx >= 0 {
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app.pending[idx] = d
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} else {
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app.pending = append(app.pending, d)
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}
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}
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}
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// return index of list with validator of same PubKey, or -1 if no match
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func pubKeyIndex(val *abci.Validator, list []*abci.Validator) int {
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for i, v := range list {
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if bytes.Equal(val.PubKey, v.PubKey) {
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return i
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}
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}
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return -1
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}
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// Make a simple default logger
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// TODO: Make log capturable for each transaction, and return it in
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// ResponseDeliverTx.Log and ResponseCheckTx.Log.
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func makeDefaultLogger() log.Logger {
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return log.NewTMLogger(log.NewSyncWriter(os.Stdout)).With("module", "sdk/app")
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}
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