Merge pull request #67 from prometheus/remove-skiplist

Remove unused skiplist types

block.go

@@ -19,7 +19,6 @@ import (
 	"io/ioutil"
 	"os"
 	"path/filepath"
-	"sort"
 
 	"github.com/oklog/ulid"
 	"github.com/pkg/errors"
@@ -241,30 +240,3 @@ func (f *mmapFile) Close() error {
 	}
 	return err1
 }
-
-// A skiplist maps offsets to values. The values found in the data at an
-// offset are strictly greater than the indexed value.
-type skiplist interface {
-	// offset returns the offset to data containing values of x and lower.
-	offset(x int64) (uint32, bool)
-}
-
-// simpleSkiplist is a slice of plain value/offset pairs.
-type simpleSkiplist []skiplistPair
-
-type skiplistPair struct {
-	value  int64
-	offset uint32
-}
-
-func (sl simpleSkiplist) offset(x int64) (uint32, bool) {
-	// Search for the first offset that contains data greater than x.
-	i := sort.Search(len(sl), func(i int) bool { return sl[i].value >= x })
-
-	// If no element was found return false. If the first element is found,
-	// there's no previous offset actually containing values that are x or lower.
-	if i == len(sl) || i == 0 {
-		return 0, false
-	}
-	return sl[i-1].offset, true
-}