Refactor Evidence Age Util + Governable Consensus Params

CHANGELOG.md

@@ -52,6 +52,7 @@ that parse log messages.
 older clients.
 * (x/auth) [\#5844](https://github.com/cosmos/cosmos-sdk/pull/5844) `tx sign` command now returns an error when signing is attempted with offline/multisig keys.
 * (client/keys) [\#5889](https://github.com/cosmos/cosmos-sdk/pull/5889) Remove `keys update` command.
+* (x/evidence) [\#5952](https://github.com/cosmos/cosmos-sdk/pull/5952) Remove CLI and REST handlers for querying `x/evidence` parameters.
 
 ### API Breaking Changes
 
@@ -86,6 +87,7 @@ constructor is provided [\#5889](https://github.com/cosmos/cosmos-sdk/pull/5889)
 to new keyring backends. Plus, the package and the new keyring no longer depends on the sdk.Config singleton. Please consult the package documentation for more
 information on how to implement the new `Keyring` interface.
   * [\#5858](https://github.com/cosmos/cosmos-sdk/pull/5858) Make Keyring store keys by name and address's hexbytes representation.
+* (x/evidence) [\#5952](https://github.com/cosmos/cosmos-sdk/pull/5952) Remove APIs for getting and setting `x/evidence` parameters. `BaseApp` now uses a `ParamStore` to manage Tendermint consensus parameters which is managed via the `x/params` `Substore` type.
 
 ### Features
 
@@ -183,6 +185,7 @@ Buffers for state serialization instead of Amino.
   * The module now accepts a `Codec` interface which extends the `codec.Marshaler` interface by
   requiring a concrete codec to know how to serialize `Proposal` types.
 * (codec) [\#5799](https://github.com/cosmos/cosmos-sdk/pull/5799) Now we favor the use of `(Un)MarshalBinaryBare` instead of `(Un)MarshalBinaryLengthPrefixed` in all cases that are not needed.
+* (x/evidence) [\#5952](https://github.com/cosmos/cosmos-sdk/pull/5952) Remove parameters from `x/evidence` genesis and module state. The `x/evidence` module now solely uses Tendermint consensus parameters to determine of evidence is valid or not.
 
 ### Improvements
 
@@ -205,6 +208,7 @@ functionality that requires an online connection.
 * (client) [\#5856](https://github.com/cosmos/cosmos-sdk/pull/5856) Added the possibility to set `--offline` flag with config command.
 * (client) [\#5895](https://github.com/cosmos/cosmos-sdk/issues/5895) show config options in the config command's help screen.
 * (types/rest) [\#5900](https://github.com/cosmos/cosmos-sdk/pull/5900) Add Check*Error function family to spare developers from replicating tons of boilerplate code.
+* (x/evidence) [\#5952](https://github.com/cosmos/cosmos-sdk/pull/5952) Tendermint Consensus parameters can now be changed via parameter change proposals through `x/gov`.
 
 ## [v0.38.3] - 2020-04-09
 

baseapp/abci.go

@@ -17,18 +17,19 @@ import (
 // InitChain implements the ABCI interface. It runs the initialization logic
 // directly on the CommitMultiStore.
 func (app *BaseApp) InitChain(req abci.RequestInitChain) (res abci.ResponseInitChain) {
-	// stash the consensus params in the cms main store and memoize
-	if req.ConsensusParams != nil {
-		app.setConsensusParams(req.ConsensusParams)
-		app.storeConsensusParams(req.ConsensusParams)
-	}
-
 	initHeader := abci.Header{ChainID: req.ChainId, Time: req.Time}
 
 	// initialize the deliver state and check state with a correct header
 	app.setDeliverState(initHeader)
 	app.setCheckState(initHeader)
 
+	// Store the consensus params in the BaseApp's paramstore. Note, this must be
+	// done after the deliver state and context have been set as it's persisted
+	// to state.
+	if req.ConsensusParams != nil {
+		app.storeConsensusParams(app.deliverState.ctx, req.ConsensusParams)
+	}
+
 	if app.initChainer == nil {
 		return
 	}
@@ -124,7 +125,7 @@ func (app *BaseApp) BeginBlock(req abci.RequestBeginBlock) (res abci.ResponseBeg
 
 	// add block gas meter
 	var gasMeter sdk.GasMeter
-	if maxGas := app.getMaximumBlockGas(); maxGas > 0 {
+	if maxGas := app.getMaximumBlockGas(app.deliverState.ctx); maxGas > 0 {
 		gasMeter = sdk.NewGasMeter(maxGas)
 	} else {
 		gasMeter = sdk.NewInfiniteGasMeter()

baseapp/baseapp.go

@@ -1,13 +1,11 @@
 package baseapp
 
 import (
-	"errors"
 	"fmt"
 	"reflect"
 	"runtime/debug"
 	"strings"
 
-	"github.com/gogo/protobuf/proto"
 	abci "github.com/tendermint/tendermint/abci/types"
 	"github.com/tendermint/tendermint/crypto/tmhash"
 	"github.com/tendermint/tendermint/libs/log"
@@ -23,9 +21,6 @@ const (
 	runTxModeReCheck                   // Recheck a (pending) transaction after a commit
 	runTxModeSimulate                  // Simulate a transaction
 	runTxModeDeliver                   // Deliver a transaction
-
-	// MainStoreKey is the string representation of the main store
-	MainStoreKey = "main"
 )
 
 var (
@@ -59,9 +54,6 @@ type BaseApp struct { // nolint: maligned
 	queryRouter sdk.QueryRouter      // router for redirecting query calls
 	txDecoder   sdk.TxDecoder        // unmarshal []byte into sdk.Tx
 
-	// set upon LoadVersion or LoadLatestVersion.
-	baseKey *sdk.KVStoreKey // Main KVStore in cms
-
 	anteHandler    sdk.AnteHandler  // ante handler for fee and auth
 	initChainer    sdk.InitChainer  // initialize state with validators and state blob
 	beginBlocker   sdk.BeginBlocker // logic to run before any txs
@@ -83,9 +75,9 @@ type BaseApp struct { // nolint: maligned
 	// absent validators from begin block
 	voteInfos []abci.VoteInfo
 
-	// consensus params
-	// TODO: Move this in the future to baseapp param store on main store.
-	consensusParams *abci.ConsensusParams
+	// paramStore is used to query for ABCI consensus parameters from an
+	// application parameter store.
+	paramStore ParamStore
 
 	// The minimum gas prices a validator is willing to accept for processing a
 	// transaction. This is mainly used for DoS and spam prevention.
@@ -209,12 +201,13 @@ func (app *BaseApp) MountStore(key sdk.StoreKey, typ sdk.StoreType) {
 
 // LoadLatestVersion loads the latest application version. It will panic if
 // called more than once on a running BaseApp.
-func (app *BaseApp) LoadLatestVersion(baseKey *sdk.KVStoreKey) error {
+func (app *BaseApp) LoadLatestVersion() error {
 	err := app.storeLoader(app.cms)
 	if err != nil {
-		return err
+		return fmt.Errorf("failed to load latest version: %w", err)
 	}
-	return app.initFromMainStore(baseKey)
+
+	return app.init()
 }
 
 // DefaultStoreLoader will be used by default and loads the latest version
@@ -224,12 +217,13 @@ func DefaultStoreLoader(ms sdk.CommitMultiStore) error {
 
 // LoadVersion loads the BaseApp application version. It will panic if called
 // more than once on a running baseapp.
-func (app *BaseApp) LoadVersion(version int64, baseKey *sdk.KVStoreKey) error {
+func (app *BaseApp) LoadVersion(version int64) error {
 	err := app.cms.LoadVersion(version)
 	if err != nil {
-		return err
+		return fmt.Errorf("failed to load version %d: %w", version, err)
 	}
-	return app.initFromMainStore(baseKey)
+
+	return app.init()
 }
 
 // LastCommitID returns the last CommitID of the multistore.
@@ -242,33 +236,9 @@ func (app *BaseApp) LastBlockHeight() int64 {
 	return app.cms.LastCommitID().Version
 }
 
-// initializes the remaining logic from app.cms
-func (app *BaseApp) initFromMainStore(baseKey *sdk.KVStoreKey) error {
-	mainStore := app.cms.GetKVStore(baseKey)
-	if mainStore == nil {
-		return errors.New("baseapp expects MultiStore with 'main' KVStore")
-	}
-
-	// memoize baseKey
-	if app.baseKey != nil {
-		panic("app.baseKey expected to be nil; duplicate init?")
-	}
-	app.baseKey = baseKey
-
-	// Load the consensus params from the main store. If the consensus params are
-	// nil, it will be saved later during InitChain.
-	//
-	// TODO: assert that InitChain hasn't yet been called.
-	consensusParamsBz := mainStore.Get(mainConsensusParamsKey)
-	if consensusParamsBz != nil {
-		var consensusParams = &abci.ConsensusParams{}
-
-		err := proto.Unmarshal(consensusParamsBz, consensusParams)
-		if err != nil {
-			panic(err)
-		}
-
-		app.setConsensusParams(consensusParams)
+func (app *BaseApp) init() error {
+	if app.sealed {
+		panic("cannot call initFromMainStore: baseapp already sealed")
 	}
 
 	// needed for the export command which inits from store but never calls initchain
@@ -337,30 +307,59 @@ func (app *BaseApp) setDeliverState(header abci.Header) {
 	}
 }
 
-// setConsensusParams memoizes the consensus params.
-func (app *BaseApp) setConsensusParams(consensusParams *abci.ConsensusParams) {
-	app.consensusParams = consensusParams
+// GetConsensusParams returns the current consensus parameters from the BaseApp's
+// ParamStore. If the BaseApp has no ParamStore defined, nil is returned.
+func (app *BaseApp) GetConsensusParams(ctx sdk.Context) *abci.ConsensusParams {
+	if app.paramStore == nil {
+		return nil
+	}
+
+	cp := new(abci.ConsensusParams)
+
+	if app.paramStore.Has(ctx, ParamStoreKeyBlockParams) {
+		var bp abci.BlockParams
+		app.paramStore.Get(ctx, ParamStoreKeyBlockParams, &bp)
+		cp.Block = &bp
+	}
+
+	if app.paramStore.Has(ctx, ParamStoreKeyEvidenceParams) {
+		var ep abci.EvidenceParams
+		app.paramStore.Get(ctx, ParamStoreKeyEvidenceParams, &ep)
+		cp.Evidence = &ep
+	}
+
+	if app.paramStore.Has(ctx, ParamStoreKeyValidatorParams) {
+		var vp abci.ValidatorParams
+		app.paramStore.Get(ctx, ParamStoreKeyValidatorParams, &vp)
+		cp.Validator = &vp
+	}
+
+	return cp
 }
 
-// setConsensusParams stores the consensus params to the main store.
-func (app *BaseApp) storeConsensusParams(consensusParams *abci.ConsensusParams) {
-	consensusParamsBz, err := proto.Marshal(consensusParams)
-	if err != nil {
-		panic(err)
+func (app *BaseApp) storeConsensusParams(ctx sdk.Context, cp *abci.ConsensusParams) {
+	if app.paramStore == nil {
+		panic("cannot store consensus params with no params store set")
 	}
-	mainStore := app.cms.GetKVStore(app.baseKey)
-	mainStore.Set(mainConsensusParamsKey, consensusParamsBz)
+	if cp == nil {
+		return
+	}
+
+	app.paramStore.Set(ctx, ParamStoreKeyBlockParams, cp.Block)
+	app.paramStore.Set(ctx, ParamStoreKeyEvidenceParams, cp.Evidence)
+	app.paramStore.Set(ctx, ParamStoreKeyValidatorParams, cp.Validator)
 }
 
 // getMaximumBlockGas gets the maximum gas from the consensus params. It panics
 // if maximum block gas is less than negative one and returns zero if negative
 // one.
-func (app *BaseApp) getMaximumBlockGas() uint64 {
-	if app.consensusParams == nil || app.consensusParams.Block == nil {
+func (app *BaseApp) getMaximumBlockGas(ctx sdk.Context) uint64 {
+	cp := app.GetConsensusParams(ctx)
+	if cp == nil || cp.Block == nil {
 		return 0
 	}
 
-	maxGas := app.consensusParams.Block.MaxGas
+	maxGas := cp.Block.MaxGas
 	switch {
 	case maxGas < -1:
 		panic(fmt.Sprintf("invalid maximum block gas: %d", maxGas))
@@ -416,8 +415,9 @@ func (app *BaseApp) getState(mode runTxMode) *state {
 func (app *BaseApp) getContextForTx(mode runTxMode, txBytes []byte) sdk.Context {
 	ctx := app.getState(mode).ctx.
 		WithTxBytes(txBytes).
-		WithVoteInfos(app.voteInfos).
-		WithConsensusParams(app.consensusParams)
+		WithVoteInfos(app.voteInfos)
+
+	ctx = ctx.WithConsensusParams(app.GetConsensusParams(ctx))
 
 	if mode == runTxModeReCheck {
 		ctx = ctx.WithIsReCheckTx(true)