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gaskvstore.go
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gaskvstore.go
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package store
import (
"io"
"reflect"
sdk "github.com/ci123chain/ci123chain/pkg/abci/types"
)
var _ KVStore = &gasKVStore{}
// gasKVStore applies gas tracking to an underlying KVStore. It implements the
// KVStore interface.
type gasKVStore struct {
gasMeter sdk.GasMeter
gasConfig sdk.GasConfig
parent sdk.KVStore
}
// NewGasKVStore returns a reference to a new GasKVStore.
// nolint
func NewGasKVStore(gasMeter sdk.GasMeter, gasConfig sdk.GasConfig, parent sdk.KVStore) *gasKVStore {
kvs := &gasKVStore{
gasMeter: gasMeter,
gasConfig: gasConfig,
parent: parent,
}
return kvs
}
// Implements Store.
func (gs *gasKVStore) GetStoreType() sdk.StoreType {
return gs.parent.GetStoreType()
}
// Implements KVStore.
func (gs *gasKVStore) Get(key []byte) (value []byte) {
gs.gasMeter.ConsumeGas(gs.gasConfig.ReadCostFlat, sdk.GasReadCostFlatDesc)
value = gs.parent.Get(key)
// TODO overflow-safe math?
gs.gasMeter.ConsumeGas(gs.gasConfig.ReadCostPerByte*sdk.Gas(len(value)), sdk.GasReadPerByteDesc)
return value
}
// Implements KVStore.
func (gs *gasKVStore) Set(key []byte, value []byte) {
gs.gasMeter.ConsumeGas(gs.gasConfig.WriteCostFlat, sdk.GasWriteCostFlatDesc)
// TODO overflow-safe math?
gs.gasMeter.ConsumeGas(gs.gasConfig.WriteCostPerByte*sdk.Gas(len(value)), sdk.GasWritePerByteDesc)
gs.parent.Set(key, value)
}
// Implements KVStore.
func (gs *gasKVStore) Has(key []byte) bool {
gs.gasMeter.ConsumeGas(gs.gasConfig.HasCost, sdk.GasHasDesc)
return gs.parent.Has(key)
}
// Implements KVStore.
func (gs *gasKVStore) Delete(key []byte) {
// charge gas to prevent certain attack vectors even though space is being freed
gs.gasMeter.ConsumeGas(gs.gasConfig.DeleteCost, sdk.GasDeleteDesc)
gs.parent.Delete(key)
}
// Implements KVStore
func (gs *gasKVStore) Prefix(prefix []byte) KVStore {
// Keep gasstore layer at the top
return &gasKVStore{
gasMeter: gs.gasMeter,
gasConfig: gs.gasConfig,
parent: prefixStore{gs.parent, prefix},
}
}
// Implements KVStore
func (gs *gasKVStore) Gas(meter GasMeter, config GasConfig) KVStore {
return NewGasKVStore(meter, config, gs)
}
// Implements KVStore
func (gs *gasKVStore) Latest(keys []string) KVStore {
//return NewlatestStore(gs, gs.storeEvery, gs.numRecent, gs.preKey, keys)
return NewlatestStore(gs, keys)
}
// Implements KVStore
func (gs *gasKVStore) Parent() KVStore {
return gs.parent
}
// Implements KVStore.
func (ks *gasKVStore) RemoteIterator(start, end []byte) Iterator {
p := ks.Parent()
for {
if reflect.TypeOf(p) != reflect.TypeOf(dbStoreAdapter{}) {
p = p.Parent()
if reflect.TypeOf(p) == reflect.TypeOf(prefixStore{}) {
start = p.(prefixStore).key(start)
end = p.(prefixStore).key(end)
}
} else {
break
}
}
return p.RemoteIterator(start, end)
}
// Iterator implements the KVStore interface. It returns an iterator which
// incurs a flat gas cost for seeking to the first types/value pair and a variable
// gas cost based on the current value's length if the iterator is valid.
func (gs *gasKVStore) Iterator(start, end []byte) sdk.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 types/value pair
// and a variable gas cost based on the current value's length if the iterator
// is valid.
func (gs *gasKVStore) ReverseIterator(start, end []byte) sdk.Iterator {
return gs.iterator(start, end, false)
}
// Implements KVStore.
func (gs *gasKVStore) CacheWrap() sdk.CacheWrap {
panic("cannot CacheWrap a GasKVStore")
}
// CacheWrapWithTrace implements the KVStore interface.
func (gs *gasKVStore) CacheWrapWithTrace(_ io.Writer, _ TraceContext) CacheWrap {
panic("cannot CacheWrapWithTrace a GasKVStore")
}
func (gs *gasKVStore) iterator(start, end []byte, ascending bool) sdk.Iterator {
var parent sdk.Iterator
if ascending {
parent = gs.parent.Iterator(start, end)
} else {
parent = gs.parent.ReverseIterator(start, end)
}
gi := newGasIterator(gs.gasMeter, gs.gasConfig, parent)
if gi.Valid() {
gi.(*gasIterator).consumeSeekGas()
}
return gi
}
type gasIterator struct {
gasMeter sdk.GasMeter
gasConfig sdk.GasConfig
parent sdk.Iterator
}
func (gi *gasIterator) Error() error {
return nil
}
func newGasIterator(gasMeter sdk.GasMeter, gasConfig sdk.GasConfig, parent sdk.Iterator) sdk.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 types/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() {
if gi.Valid() {
gi.consumeSeekGas()
}
gi.parent.Next()
}
// Key implements the Iterator interface. It returns the current types 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()
}
// consumeSeekGas consumes a flat gas cost for seeking and a variable gas cost
// based on the current value's length.
func (gi *gasIterator) consumeSeekGas() {
value := gi.Value()
gi.gasMeter.ConsumeGas(gi.gasConfig.ValueCostPerByte*sdk.Gas(len(value)), sdk.GasValuePerByteDesc)
gi.gasMeter.ConsumeGas(gi.gasConfig.IterNextCostFlat, sdk.GasIterNextCostFlatDesc)
}