37 lines
882 B
Go
37 lines
882 B
Go
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package store
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import "bytes"
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// Convenience for implemntation of IterKVCache.First using IterKVCache.Iterator
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func iteratorFirst(st IterKVStore, start, end []byte) (kv KVPair, ok bool) {
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iter := st.Iterator(start, end)
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if !iter.Valid() {
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return kv, false
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}
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defer iter.Release()
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return KVPair{iter.Key(), iter.Value()}, true
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}
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// Convenience for implemntation of IterKVCache.Last using IterKVCache.ReverseIterator
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func iteratorLast(st IterKVStore, start, end []byte) (kv KVPair, ok bool) {
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iter := st.ReverseIterator(end, start)
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if !iter.Valid() {
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if v := st.Get(start); v != nil {
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return KVPair{cp(start), cp(v)}, true
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} else {
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return kv, false
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}
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}
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defer iter.Release()
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if bytes.Equal(iter.Key(), end) {
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// Skip this one, end is exclusive.
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iter.Next()
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if !iter.Valid() {
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return kv, false
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}
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}
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return KVPair{iter.Key(), iter.Value()}, true
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}
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