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perf: Make CacheKV store interleaved iterator and insertion not O(n^2) (
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,107 +1,50 @@ | ||
| package cachekv | ||
|
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||
| import ( | ||
| "errors" | ||
|
|
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| dbm "github.com/tendermint/tm-db" | ||
|
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| "github.com/cosmos/cosmos-sdk/types/kv" | ||
| "github.com/cosmos/cosmos-sdk/store/types" | ||
| ) | ||
|
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| // Iterates over iterKVCache items. | ||
| // if key is nil, means it was deleted. | ||
| // Implements Iterator. | ||
| type memIterator struct { | ||
| start, end []byte | ||
| items []*kv.Pair | ||
| ascending bool | ||
| } | ||
|
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| func newMemIterator(start, end []byte, items *kv.List, ascending bool) *memIterator { | ||
| itemsInDomain := make([]*kv.Pair, 0, items.Len()) | ||
|
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| var entered bool | ||
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| for e := items.Front(); e != nil; e = e.Next() { | ||
| item := e.Value | ||
| if !dbm.IsKeyInDomain(item.Key, start, end) { | ||
| if entered { | ||
| break | ||
| } | ||
|
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| continue | ||
| } | ||
|
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| itemsInDomain = append(itemsInDomain, item) | ||
| entered = true | ||
| } | ||
| types.Iterator | ||
|
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| return &memIterator{ | ||
| start: start, | ||
| end: end, | ||
| items: itemsInDomain, | ||
| ascending: ascending, | ||
| } | ||
| deleted map[string]struct{} | ||
| } | ||
|
|
||
| func (mi *memIterator) Domain() ([]byte, []byte) { | ||
| return mi.start, mi.end | ||
| } | ||
| func newMemIterator(start, end []byte, items *dbm.MemDB, deleted map[string]struct{}, ascending bool) *memIterator { | ||
| var iter types.Iterator | ||
| var err error | ||
|
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| func (mi *memIterator) Valid() bool { | ||
| return len(mi.items) > 0 | ||
| } | ||
| if ascending { | ||
| iter, err = items.Iterator(start, end) | ||
| } else { | ||
| iter, err = items.ReverseIterator(start, end) | ||
| } | ||
|
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| func (mi *memIterator) assertValid() { | ||
| if err := mi.Error(); err != nil { | ||
| if err != nil { | ||
| panic(err) | ||
| } | ||
| } | ||
|
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| func (mi *memIterator) Next() { | ||
| mi.assertValid() | ||
|
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| if mi.ascending { | ||
| mi.items = mi.items[1:] | ||
| } else { | ||
| mi.items = mi.items[:len(mi.items)-1] | ||
| newDeleted := make(map[string]struct{}) | ||
| for k, v := range deleted { | ||
| newDeleted[k] = v | ||
| } | ||
| } | ||
|
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| func (mi *memIterator) Key() []byte { | ||
| mi.assertValid() | ||
| return &memIterator{ | ||
| Iterator: iter, | ||
|
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| if mi.ascending { | ||
| return mi.items[0].Key | ||
| deleted: newDeleted, | ||
| } | ||
|
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| return mi.items[len(mi.items)-1].Key | ||
| } | ||
|
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| func (mi *memIterator) Value() []byte { | ||
| mi.assertValid() | ||
|
|
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| if mi.ascending { | ||
| return mi.items[0].Value | ||
| } | ||
|
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| return mi.items[len(mi.items)-1].Value | ||
| } | ||
|
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| func (mi *memIterator) Close() error { | ||
| mi.start = nil | ||
| mi.end = nil | ||
| mi.items = nil | ||
|
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| return nil | ||
| } | ||
|
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| // Error returns an error if the memIterator is invalid defined by the Valid | ||
| // method. | ||
| func (mi *memIterator) Error() error { | ||
| if !mi.Valid() { | ||
| return errors.New("invalid memIterator") | ||
| key := mi.Iterator.Key() | ||
| if _, ok := mi.deleted[string(key)]; ok { | ||
| return nil | ||
| } | ||
|
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||
| return nil | ||
| return mi.Iterator.Value() | ||
| } |
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