Merge pull request #1481: Transient Stores

move gasconfig to types, make GetKVStoreWithGas take GasConfig

fix lint

modify transientstore

in progress

add test for transientstore

fix errors

fix test

fix errors and lint

last fix

in progress

move transient to KVStore

fix syntax errors

finalize rebase

remove NewMemDBStoreAdapter for lint

apply requests

apply requests

apply requests

add CHANGELOG

add tests

fix getter

in progress

finalize rebase

fix lint

partially apply requests

assert -> require

apply requests

fix test

Changelog => Pending

add TransientStoreKey

fix lint

fix lint

PENDING.md

@@ -29,6 +29,9 @@ FEATURES
 * [baseapp] Initialize validator set on ResponseInitChain
 * [cosmos-sdk-cli] Added support for cosmos-sdk-cli tool under cosmos-sdk/cmd	
    * This allows SDK users to initialize a new project repository.
+* Added support for cosmos-sdk-cli tool under cosmos-sdk/cmd	
+   * This allows SDK users to init a new project repository with a single command.
+* [store] Add transient store
 
 IMPROVEMENTS
 * [baseapp] Allow any alphanumeric character in route

server/mock/store.go

@@ -8,6 +8,8 @@ import (
 	sdk "github.com/cosmos/cosmos-sdk/types"
 )
 
+var _ sdk.MultiStore = multiStore{}
+
 type multiStore struct {
 	kv map[sdk.StoreKey]kvStore
 }
@@ -76,10 +78,6 @@ func (ms multiStore) GetKVStore(key sdk.StoreKey) sdk.KVStore {
 	return ms.kv[key]
 }
 
-func (ms multiStore) GetKVStoreWithGas(meter sdk.GasMeter, key sdk.StoreKey) sdk.KVStore {
-	panic("not implemented")
-}
-
 func (ms multiStore) GetStore(key sdk.StoreKey) sdk.Store {
 	panic("not implemented")
 }
@@ -88,6 +86,8 @@ func (ms multiStore) GetStoreType() sdk.StoreType {
 	panic("not implemented")
 }
 
+var _ sdk.KVStore = kvStore{}
+
 type kvStore struct {
 	store map[string][]byte
 }
@@ -129,6 +129,10 @@ func (kv kvStore) Prefix(prefix []byte) sdk.KVStore {
 	panic("not implemented")
 }
 
+func (kv kvStore) Gas(meter sdk.GasMeter, config sdk.GasConfig) sdk.KVStore {
+	panic("not implmeneted")
+}
+
 func (kv kvStore) Iterator(start, end []byte) sdk.Iterator {
 	panic("not implemented")
 }

store/cachekvstore.go

@@ -85,6 +85,11 @@ func (ci *cacheKVStore) Prefix(prefix []byte) KVStore {
 	return prefixStore{ci, prefix}
 }
 
+// Implements KVStore
+func (ci *cacheKVStore) Gas(meter GasMeter, config GasConfig) KVStore {
+	return NewGasKVStore(meter, config, ci)
+}
+
 // Implements CacheKVStore.
 func (ci *cacheKVStore) Write() {
 	ci.mtx.Lock()

store/cachemultistore.go

@@ -134,6 +134,6 @@ func (cms cacheMultiStore) GetKVStore(key StoreKey) KVStore {
 }
 
 // Implements MultiStore.
-func (cms cacheMultiStore) GetKVStoreWithGas(meter sdk.GasMeter, key StoreKey) KVStore {
-	return NewGasKVStore(meter, cms.GetKVStore(key))
+func (cms cacheMultiStore) GetKVStoreWithGas(meter sdk.GasMeter, config sdk.GasConfig, key StoreKey) KVStore {
+	return NewGasKVStore(meter, config, cms.GetKVStore(key))
 }

store/dbstoreadapter.go

@@ -7,6 +7,7 @@ import (
 	dbm "github.com/tendermint/tendermint/libs/db"
 )
 
+// Wrapper type for dbm.Db with implementation of KVStore
 type dbStoreAdapter struct {
 	dbm.DB
 }
@@ -31,5 +32,10 @@ func (dsa dbStoreAdapter) Prefix(prefix []byte) KVStore {
 	return prefixStore{dsa, prefix}
 }
 
+// Implements KVStore
+func (dsa dbStoreAdapter) Gas(meter GasMeter, config GasConfig) KVStore {
+	return NewGasKVStore(meter, config, dsa)
+}
+
 // dbm.DB implements KVStore so we can CacheKVStore it.
-var _ KVStore = dbStoreAdapter{dbm.DB(nil)}
+var _ KVStore = dbStoreAdapter{}

store/gaskvstore.go

@@ -6,29 +6,21 @@ import (
 	sdk "github.com/cosmos/cosmos-sdk/types"
 )
 
-// nolint
-const (
-	HasCost          = 10
-	ReadCostFlat     = 10
-	ReadCostPerByte  = 1
-	WriteCostFlat    = 10
-	WriteCostPerByte = 10
-	KeyCostFlat      = 5
-	ValueCostFlat    = 10
-	ValueCostPerByte = 1
-)
+var _ KVStore = &gasKVStore{}
 
 // gasKVStore applies gas tracking to an underlying kvstore
 type gasKVStore struct {
-	gasMeter sdk.GasMeter
-	parent   sdk.KVStore
+	gasMeter  sdk.GasMeter
+	gasConfig sdk.GasConfig
+	parent    sdk.KVStore
 }
 
 // nolint
-func NewGasKVStore(gasMeter sdk.GasMeter, parent sdk.KVStore) *gasKVStore {
+func NewGasKVStore(gasMeter sdk.GasMeter, gasConfig sdk.GasConfig, parent sdk.KVStore) *gasKVStore {
 	kvs := &gasKVStore{
-		gasMeter: gasMeter,
-		parent:   parent,
+		gasMeter:  gasMeter,
+		gasConfig: gasConfig,
+		parent:    parent,
 	}
 	return kvs
 }
@@ -40,24 +32,25 @@ func (gi *gasKVStore) GetStoreType() sdk.StoreType {
 
 // Implements KVStore.
 func (gi *gasKVStore) Get(key []byte) (value []byte) {
-	gi.gasMeter.ConsumeGas(ReadCostFlat, "GetFlat")
+	gi.gasMeter.ConsumeGas(gi.gasConfig.ReadCostFlat, "ReadFlat")
 	value = gi.parent.Get(key)
 	// TODO overflow-safe math?
-	gi.gasMeter.ConsumeGas(ReadCostPerByte*sdk.Gas(len(value)), "ReadPerByte")
+	gi.gasMeter.ConsumeGas(gi.gasConfig.ReadCostPerByte*sdk.Gas(len(value)), "ReadPerByte")
+
 	return value
 }
 
 // Implements KVStore.
 func (gi *gasKVStore) Set(key []byte, value []byte) {
-	gi.gasMeter.ConsumeGas(WriteCostFlat, "SetFlat")
+	gi.gasMeter.ConsumeGas(gi.gasConfig.WriteCostFlat, "WriteFlat")
 	// TODO overflow-safe math?
-	gi.gasMeter.ConsumeGas(WriteCostPerByte*sdk.Gas(len(value)), "SetPerByte")
+	gi.gasMeter.ConsumeGas(gi.gasConfig.WriteCostPerByte*sdk.Gas(len(value)), "WritePerByte")
 	gi.parent.Set(key, value)
 }
 
 // Implements KVStore.
 func (gi *gasKVStore) Has(key []byte) bool {
-	gi.gasMeter.ConsumeGas(HasCost, "Has")
+	gi.gasMeter.ConsumeGas(gi.gasConfig.HasCost, "Has")
 	return gi.parent.Has(key)
 }
 
@@ -69,7 +62,17 @@ func (gi *gasKVStore) Delete(key []byte) {
 
 // Implements KVStore
 func (gi *gasKVStore) Prefix(prefix []byte) KVStore {
-	return prefixStore{gi, prefix}
+	// Keep gasstore layer at the top
+	return &gasKVStore{
+		gasMeter:  gi.gasMeter,
+		gasConfig: gi.gasConfig,
+		parent:    prefixStore{gi.parent, prefix},
+	}
+}
+
+// Implements KVStore
+func (gi *gasKVStore) Gas(meter GasMeter, config GasConfig) KVStore {
+	return NewGasKVStore(meter, config, gi)
 }
 
 // Implements KVStore.
@@ -99,18 +102,20 @@ func (gi *gasKVStore) iterator(start, end []byte, ascending bool) sdk.Iterator {
 	} else {
 		parent = gi.parent.ReverseIterator(start, end)
 	}
-	return newGasIterator(gi.gasMeter, parent)
+	return newGasIterator(gi.gasMeter, gi.gasConfig, parent)
 }
 
 type gasIterator struct {
-	gasMeter sdk.GasMeter
-	parent   sdk.Iterator
+	gasMeter  sdk.GasMeter
+	gasConfig sdk.GasConfig
+	parent    sdk.Iterator
 }
 
-func newGasIterator(gasMeter sdk.GasMeter, parent sdk.Iterator) sdk.Iterator {
+func newGasIterator(gasMeter sdk.GasMeter, gasConfig sdk.GasConfig, parent sdk.Iterator) sdk.Iterator {
 	return &gasIterator{
-		gasMeter: gasMeter,
-		parent:   parent,
+		gasMeter:  gasMeter,
+		gasConfig: gasConfig,
+		parent:    parent,
 	}
 }
 
@@ -131,16 +136,16 @@ func (g *gasIterator) Next() {
 
 // Implements Iterator.
 func (g *gasIterator) Key() (key []byte) {
-	g.gasMeter.ConsumeGas(KeyCostFlat, "KeyFlat")
+	g.gasMeter.ConsumeGas(g.gasConfig.KeyCostFlat, "KeyFlat")
 	key = g.parent.Key()
 	return key
 }
 
 // Implements Iterator.
 func (g *gasIterator) Value() (value []byte) {
 	value = g.parent.Value()
-	g.gasMeter.ConsumeGas(ValueCostFlat, "ValueFlat")
-	g.gasMeter.ConsumeGas(ValueCostPerByte*sdk.Gas(len(value)), "ValuePerByte")
+	g.gasMeter.ConsumeGas(g.gasConfig.ValueCostFlat, "ValueFlat")
+	g.gasMeter.ConsumeGas(g.gasConfig.ValueCostPerByte*sdk.Gas(len(value)), "ValuePerByte")
 	return value
 }
 

store/gaskvstore_test.go

@@ -3,21 +3,23 @@ package store
 import (
 	"testing"
 
+	dbm "github.com/tendermint/tendermint/libs/db"
+
 	sdk "github.com/cosmos/cosmos-sdk/types"
+
 	"github.com/stretchr/testify/require"
-	dbm "github.com/tendermint/tendermint/libs/db"
 )
 
 func newGasKVStore() KVStore {
 	meter := sdk.NewGasMeter(1000)
 	mem := dbStoreAdapter{dbm.NewMemDB()}
-	return NewGasKVStore(meter, mem)
+	return NewGasKVStore(meter, sdk.DefaultGasConfig(), mem)
 }
 
 func TestGasKVStoreBasic(t *testing.T) {
 	mem := dbStoreAdapter{dbm.NewMemDB()}
 	meter := sdk.NewGasMeter(1000)
-	st := NewGasKVStore(meter, mem)
+	st := NewGasKVStore(meter, sdk.DefaultGasConfig(), mem)
 	require.Empty(t, st.Get(keyFmt(1)), "Expected `key1` to be empty")
 	st.Set(keyFmt(1), valFmt(1))
 	require.Equal(t, valFmt(1), st.Get(keyFmt(1)))
@@ -29,7 +31,7 @@ func TestGasKVStoreBasic(t *testing.T) {
 func TestGasKVStoreIterator(t *testing.T) {
 	mem := dbStoreAdapter{dbm.NewMemDB()}
 	meter := sdk.NewGasMeter(1000)
-	st := NewGasKVStore(meter, mem)
+	st := NewGasKVStore(meter, sdk.DefaultGasConfig(), mem)
 	require.Empty(t, st.Get(keyFmt(1)), "Expected `key1` to be empty")
 	require.Empty(t, st.Get(keyFmt(2)), "Expected `key2` to be empty")
 	st.Set(keyFmt(1), valFmt(1))
@@ -53,16 +55,51 @@ func TestGasKVStoreIterator(t *testing.T) {
 func TestGasKVStoreOutOfGasSet(t *testing.T) {
 	mem := dbStoreAdapter{dbm.NewMemDB()}
 	meter := sdk.NewGasMeter(0)
-	st := NewGasKVStore(meter, mem)
+	st := NewGasKVStore(meter, sdk.DefaultGasConfig(), mem)
 	require.Panics(t, func() { st.Set(keyFmt(1), valFmt(1)) }, "Expected out-of-gas")
 }
 
 func TestGasKVStoreOutOfGasIterator(t *testing.T) {
 	mem := dbStoreAdapter{dbm.NewMemDB()}
 	meter := sdk.NewGasMeter(200)
-	st := NewGasKVStore(meter, mem)
+	st := NewGasKVStore(meter, sdk.DefaultGasConfig(), mem)
 	st.Set(keyFmt(1), valFmt(1))
 	iterator := st.Iterator(nil, nil)
 	iterator.Next()
 	require.Panics(t, func() { iterator.Value() }, "Expected out-of-gas")
 }
+
+func testGasKVStoreWrap(t *testing.T, store KVStore) {
+	meter := sdk.NewGasMeter(10000)
+
+	store = store.Gas(meter, sdk.GasConfig{HasCost: 10})
+	require.Equal(t, int64(0), meter.GasConsumed())
+
+	store.Has([]byte("key"))
+	require.Equal(t, int64(10), meter.GasConsumed())
+
+	store = store.Gas(meter, sdk.GasConfig{HasCost: 20})
+
+	store.Has([]byte("key"))
+	require.Equal(t, int64(40), meter.GasConsumed())
+}
+
+func TestGasKVStoreWrap(t *testing.T) {
+	db := dbm.NewMemDB()
+	tree, _ := newTree(t, db)
+	iavl := newIAVLStore(tree, numRecent, storeEvery)
+	testGasKVStoreWrap(t, iavl)
+
+	st := NewCacheKVStore(iavl)
+	testGasKVStoreWrap(t, st)
+
+	pref := st.Prefix([]byte("prefix"))
+	testGasKVStoreWrap(t, pref)
+
+	dsa := dbStoreAdapter{dbm.NewMemDB()}
+	testGasKVStoreWrap(t, dsa)
+
+	ts := newTransientStore()
+	testGasKVStoreWrap(t, ts)
+
+}

store/iavlstore.go

@@ -67,7 +67,6 @@ func newIAVLStore(tree *iavl.VersionedTree, numRecent int64, storeEvery int64) *
 
 // Implements Committer.
 func (st *iavlStore) Commit() CommitID {
-
 	// Save a new version.
 	hash, version, err := st.tree.SaveVersion()
 	if err != nil {
@@ -161,6 +160,11 @@ func (st *iavlStore) Prefix(prefix []byte) KVStore {
 	return prefixStore{st, prefix}
 }
 
+// Implements KVStore
+func (st *iavlStore) Gas(meter GasMeter, config GasConfig) KVStore {
+	return NewGasKVStore(meter, config, st)
+}
+
 // Implements KVStore.
 func (st *iavlStore) Iterator(start, end []byte) Iterator {
 	return newIAVLIterator(st.tree.Tree(), start, end, true)

store/iavlstore_test.go

@@ -446,6 +446,7 @@ func TestIAVLStoreQuery(t *testing.T) {
 	require.Equal(t, uint32(sdk.CodeOK), qres.Code)
 	require.Equal(t, v3, qres.Value)
 	query2 := abci.RequestQuery{Path: "/key", Data: k2, Height: cid.Version}
+
 	qres = iavlStore.Query(query2)
 	require.Equal(t, uint32(sdk.CodeOK), qres.Code)
 	require.Equal(t, v2, qres.Value)