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gas_store.go
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gas_store.go
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package types
import (
"io"
"time"
"github.com/cosmos/cosmos-sdk/store/gaskv"
"github.com/cosmos/cosmos-sdk/store/types"
stypes "github.com/cosmos/cosmos-sdk/store/types"
"github.com/cosmos/cosmos-sdk/telemetry"
sdk "github.com/cosmos/cosmos-sdk/types"
)
var _ types.KVStore = &Store{}
// KVStore return new gas KVStore which fixed
// https://github.com/cosmos/cosmos-sdk/issues/10243
func KVStore(ctx sdk.Context, key sdk.StoreKey) types.KVStore {
if (ctx.ChainID() == "bombay-12" && ctx.BlockHeight() < 7_800_000) ||
(ctx.ChainID() == "columbus-5" && ctx.BlockHeight() < 6_470_000) {
return gaskv.NewStore(ctx.MultiStore().GetKVStore(key), ctx.GasMeter(), stypes.KVGasConfig())
}
return NewStore(ctx.MultiStore().GetKVStore(key), ctx.GasMeter(), stypes.KVGasConfig())
}
// Store applies gas tracking to an underlying KVStore. It implements the
// KVStore interface.
type Store struct {
gasMeter types.GasMeter
gasConfig types.GasConfig
parent types.KVStore
}
// NewStore returns a reference to a new GasKVStore.
func NewStore(parent types.KVStore, gasMeter types.GasMeter, gasConfig types.GasConfig) *Store {
kvs := &Store{
gasMeter: gasMeter,
gasConfig: gasConfig,
parent: parent,
}
return kvs
}
// GetStoreType implements Store.
func (gs *Store) GetStoreType() types.StoreType {
return gs.parent.GetStoreType()
}
// Get implements KVStore.
func (gs *Store) Get(key []byte) (value []byte) {
gs.gasMeter.ConsumeGas(gs.gasConfig.ReadCostFlat, types.GasReadCostFlatDesc)
value = gs.parent.Get(key)
// TODO overflow-safe math?
gs.gasMeter.ConsumeGas(gs.gasConfig.ReadCostPerByte*types.Gas(len(key)), types.GasReadPerByteDesc)
gs.gasMeter.ConsumeGas(gs.gasConfig.ReadCostPerByte*types.Gas(len(value)), types.GasReadPerByteDesc)
return value
}
// Set implements KVStore.
func (gs *Store) Set(key []byte, value []byte) {
types.AssertValidKey(key)
types.AssertValidValue(value)
gs.gasMeter.ConsumeGas(gs.gasConfig.WriteCostFlat, types.GasWriteCostFlatDesc)
// TODO overflow-safe math?
gs.gasMeter.ConsumeGas(gs.gasConfig.WriteCostPerByte*types.Gas(len(key)), types.GasWritePerByteDesc)
gs.gasMeter.ConsumeGas(gs.gasConfig.WriteCostPerByte*types.Gas(len(value)), types.GasWritePerByteDesc)
gs.parent.Set(key, value)
}
// Has implements KVStore.
func (gs *Store) Has(key []byte) bool {
defer telemetry.MeasureSince(time.Now(), "store", "gaskv", "has")
gs.gasMeter.ConsumeGas(gs.gasConfig.HasCost, types.GasHasDesc)
return gs.parent.Has(key)
}
// Delete implements KVStore.
func (gs *Store) Delete(key []byte) {
defer telemetry.MeasureSince(time.Now(), "store", "gaskv", "delete")
// charge gas to prevent certain attack vectors even though space is being freed
gs.gasMeter.ConsumeGas(gs.gasConfig.DeleteCost, types.GasDeleteDesc)
gs.parent.Delete(key)
}
// Iterator implements the KVStore interface. It returns an iterator which
// incurs a flat gas cost for seeking to the first key/value pair and a variable
// gas cost based on the current value's length if the iterator is valid.
func (gs *Store) Iterator(start, end []byte) types.Iterator {
return gs.iterator(start, end, true)
}
// ReverseIterator implements the KVStore interface. It returns a reverse
// iterator which incurs a flat gas cost for seeking to the first key/value pair
// and a variable gas cost based on the current value's length if the iterator
// is valid.
func (gs *Store) ReverseIterator(start, end []byte) types.Iterator {
return gs.iterator(start, end, false)
}
// CacheWrap implements KVStore.
func (gs *Store) CacheWrap() types.CacheWrap {
panic("cannot CacheWrap a GasKVStore")
}
// CacheWrapWithTrace implements the KVStore interface.
func (gs *Store) CacheWrapWithTrace(_ io.Writer, _ types.TraceContext) types.CacheWrap {
panic("cannot CacheWrapWithTrace a GasKVStore")
}
// CacheWrapWithListeners implements the CacheWrapper interface.
func (gs *Store) CacheWrapWithListeners(_ types.StoreKey, _ []types.WriteListener) types.CacheWrap {
panic("cannot CacheWrapWithListeners a GasKVStore")
}
func (gs *Store) iterator(start, end []byte, ascending bool) types.Iterator {
var parent types.Iterator
if ascending {
parent = gs.parent.Iterator(start, end)
} else {
parent = gs.parent.ReverseIterator(start, end)
}
gi := newGasIterator(gs.gasMeter, gs.gasConfig, parent)
gi.(*gasIterator).consumeSeekGas()
return gi
}
type gasIterator struct {
gasMeter types.GasMeter
gasConfig types.GasConfig
parent types.Iterator
}
func newGasIterator(gasMeter types.GasMeter, gasConfig types.GasConfig, parent types.Iterator) types.Iterator {
return &gasIterator{
gasMeter: gasMeter,
gasConfig: gasConfig,
parent: parent,
}
}
// Implements Iterator.
func (gi *gasIterator) Domain() (start []byte, end []byte) {
return gi.parent.Domain()
}
// Implements Iterator.
func (gi *gasIterator) Valid() bool {
return gi.parent.Valid()
}
// Next implements the Iterator interface. It seeks to the next key/value pair
// in the iterator. It incurs a flat gas cost for seeking and a variable gas
// cost based on the current value's length if the iterator is valid.
func (gi *gasIterator) Next() {
gi.consumeSeekGas()
gi.parent.Next()
}
// Key implements the Iterator interface. It returns the current key and it does
// not incur any gas cost.
func (gi *gasIterator) Key() (key []byte) {
key = gi.parent.Key()
return key
}
// Value implements the Iterator interface. It returns the current value and it
// does not incur any gas cost.
func (gi *gasIterator) Value() (value []byte) {
value = gi.parent.Value()
return value
}
// Implements Iterator.
func (gi *gasIterator) Close() error {
return gi.parent.Close()
}
// Error delegates the Error call to the parent iterator.
func (gi *gasIterator) Error() error {
return gi.parent.Error()
}
// consumeSeekGas consumes on each iteration step a flat gas cost and a variable gas cost
// based on the current value's length.
func (gi *gasIterator) consumeSeekGas() {
if gi.Valid() {
key := gi.Key()
value := gi.Value()
gi.gasMeter.ConsumeGas(gi.gasConfig.ReadCostPerByte*types.Gas(len(key)), types.GasValuePerByteDesc)
gi.gasMeter.ConsumeGas(gi.gasConfig.ReadCostPerByte*types.Gas(len(value)), types.GasValuePerByteDesc)
}
gi.gasMeter.ConsumeGas(gi.gasConfig.IterNextCostFlat, types.GasIterNextCostFlatDesc)
}