func copyColl(srcColl *gkvlite.Collection, dstColl *gkvlite.Collection,
writeEvery int) (numItems uint64, lastItem *gkvlite.Item, err error) {
minItem, err := srcColl.MinItem(true)
if err != nil {
return 0, nil, err
}
if minItem == nil {
return 0, nil, nil
}
var errVisit error = nil
err = srcColl.VisitItemsAscend(minItem.Key, true, func(i *gkvlite.Item) bool {
if errVisit = dstColl.SetItem(i); errVisit != nil {
return false
}
numItems++
lastItem = i
if writeEvery > 0 && numItems%uint64(writeEvery) == 0 {
if errVisit = dstColl.Write(); errVisit != nil {
return false
}
}
return true
})
if err != nil {
return 0, nil, err
}
if errVisit != nil {
return 0, nil, errVisit
}
return numItems, lastItem, nil
}
func collRangeCopy(src *gkvlite.Collection, dst *gkvlite.Collection,
minKey []byte,
minKeyInclusive []byte,
maxKeyExclusive []byte) error {
var errVisit error
visitor := func(i *gkvlite.Item) bool {
if len(minKeyInclusive) > 0 &&
bytes.Compare(i.Key, minKeyInclusive) < 0 {
return true
}
if len(maxKeyExclusive) > 0 &&
bytes.Compare(i.Key, maxKeyExclusive) >= 0 {
return true
}
errVisit = dst.SetItem(i)
if errVisit != nil {
return false
}
return true
}
if errVisit != nil {
return errVisit
}
return src.VisitItemsAscend(minKey, true, visitor)
}
func testFillColl(x *gkvlite.Collection, arr []string) {
for i, s := range arr {
x.SetItem(&gkvlite.Item{
Key: []byte(s),
Val: []byte(s),
Priority: int32(i),
})
}
}