b6478026c4
## Description Ref: https://github.com/cosmos/cosmos-sdk/issues/11362 --- ### Author Checklist *All items are required. Please add a note to the item if the item is not applicable and please add links to any relevant follow up issues.* I have... - [x] included the correct [type prefix](https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.json) in the PR title - [ ] added `!` to the type prefix if API or client breaking change - [x] targeted the correct branch (see [PR Targeting](https://github.com/cosmos/cosmos-sdk/blob/main/CONTRIBUTING.md#pr-targeting)) - [x] provided a link to the relevant issue or specification - [ ] followed the guidelines for [building modules](https://github.com/cosmos/cosmos-sdk/blob/main/docs/building-modules) - [ ] included the necessary unit and integration [tests](https://github.com/cosmos/cosmos-sdk/blob/main/CONTRIBUTING.md#testing) - [ ] added a changelog entry to `CHANGELOG.md` - [ ] included comments for [documenting Go code](https://blog.golang.org/godoc) - [ ] updated the relevant documentation or specification - [ ] reviewed "Files changed" and left comments if necessary - [ ] confirmed all CI checks have passed ### Reviewers Checklist *All items are required. Please add a note if the item is not applicable and please add your handle next to the items reviewed if you only reviewed selected items.* I have... - [ ] confirmed the correct [type prefix](https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.json) in the PR title - [ ] confirmed `!` in the type prefix if API or client breaking change - [ ] confirmed all author checklist items have been addressed - [ ] reviewed state machine logic - [ ] reviewed API design and naming - [ ] reviewed documentation is accurate - [ ] reviewed tests and test coverage - [ ] manually tested (if applicable)
57 lines
1.4 KiB
Go
57 lines
1.4 KiB
Go
package cachekv
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import (
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"bytes"
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dbm "github.com/tendermint/tm-db"
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"github.com/cosmos/cosmos-sdk/store/types"
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)
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// memIterator iterates over iterKVCache items.
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// if key is nil, means it was deleted.
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// Implements Iterator.
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type memIterator struct {
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types.Iterator
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lastKey []byte
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deleted map[string]struct{}
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}
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func newMemIterator(start, end []byte, items *dbm.MemDB, deleted map[string]struct{}, ascending bool) *memIterator {
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var iter types.Iterator
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var err error
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if ascending {
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iter, err = items.Iterator(start, end)
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} else {
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iter, err = items.ReverseIterator(start, end)
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}
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if err != nil {
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panic(err)
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}
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return &memIterator{
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Iterator: iter,
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lastKey: nil,
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deleted: deleted,
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}
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}
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func (mi *memIterator) Value() []byte {
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key := mi.Iterator.Key()
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// We need to handle the case where deleted is modified and includes our current key
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// We handle this by maintaining a lastKey object in the iterator.
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// If the current key is the same as the last key (and last key is not nil / the start)
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// then we are calling value on the same thing as last time.
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// Therefore we don't check the mi.deleted to see if this key is included in there.
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reCallingOnOldLastKey := (mi.lastKey != nil) && bytes.Equal(key, mi.lastKey)
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if _, ok := mi.deleted[string(key)]; ok && !reCallingOnOldLastKey {
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return nil
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}
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mi.lastKey = key
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return mi.Iterator.Value()
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}
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