simplify sort.Sort by using sort.Slice (#17066)

cmd/admin-handlers_test.go

@@ -479,8 +479,8 @@ func TestTopLockEntries(t *testing.T) {
 		if len(exp) != len(got) {
 			return 0, false
 		}
-		sort.Sort(byResourceUID{exp})
-		sort.Sort(byResourceUID{got})
+		sort.Slice(exp, byResourceUID{exp}.Less)
+		sort.Slice(got, byResourceUID{got}.Less)
 		// printEntries(exp)
 		// printEntries(got)
 		for i, e := range exp {

cmd/erasure-metadata.go

@@ -42,13 +42,6 @@ const minIOErasureUpgraded = "x-minio-internal-erasure-upgraded"
 
 const erasureAlgorithm = "rs-vandermonde"
 
-// byObjectPartNumber is a collection satisfying sort.Interface.
-type byObjectPartNumber []ObjectPartInfo
-
-func (t byObjectPartNumber) Len() int           { return len(t) }
-func (t byObjectPartNumber) Swap(i, j int)      { t[i], t[j] = t[j], t[i] }
-func (t byObjectPartNumber) Less(i, j int) bool { return t[i].Number < t[j].Number }
-
 // AddChecksumInfo adds a checksum of a part.
 func (e *ErasureInfo) AddChecksumInfo(ckSumInfo ChecksumInfo) {
 	for i, sum := range e.Checksums {
@@ -308,7 +301,7 @@ func (fi *FileInfo) AddObjectPart(partNumber int, partETag string, partSize, act
 	fi.Parts = append(fi.Parts, partInfo)
 
 	// Parts in FileInfo should be in sorted order by part number.
-	sort.Sort(byObjectPartNumber(fi.Parts))
+	sort.Slice(fi.Parts, func(i, j int) bool { return fi.Parts[i].Number < fi.Parts[j].Number })
 }
 
 // ObjectToPartOffset - translate offset of an object to offset of its individual part.

cmd/erasure.go

@@ -94,15 +94,6 @@ func (er erasureObjects) defaultWQuorum() int {
 	return dataCount
 }
 
-// byDiskTotal is a collection satisfying sort.Interface.
-type byDiskTotal []madmin.Disk
-
-func (d byDiskTotal) Len() int      { return len(d) }
-func (d byDiskTotal) Swap(i, j int) { d[i], d[j] = d[j], d[i] }
-func (d byDiskTotal) Less(i, j int) bool {
-	return d[i].TotalSpace < d[j].TotalSpace
-}
-
 func diskErrToDriveState(err error) (state string) {
 	switch {
 	case errors.Is(err, errDiskNotFound) || errors.Is(err, context.DeadlineExceeded):
@@ -245,7 +236,9 @@ func getStorageInfo(disks []StorageAPI, endpoints []Endpoint) StorageInfo {
 	disksInfo := getDisksInfo(disks, endpoints)
 
 	// Sort so that the first element is the smallest.
-	sort.Sort(byDiskTotal(disksInfo))
+	sort.Slice(disksInfo, func(i, j int) bool {
+		return disksInfo[i].TotalSpace < disksInfo[j].TotalSpace
+	})
 
 	storageInfo := StorageInfo{
 		Disks: disksInfo,

cmd/net.go

@@ -111,25 +111,6 @@ func getHostIP(host string) (ipList set.StringSet, err error) {
 	return ipList, err
 }
 
-// byLastOctetValue implements sort.Interface used in sorting a list
-// of ip address by their last octet value in descending order.
-type byLastOctetValue []net.IP
-
-func (n byLastOctetValue) Len() int      { return len(n) }
-func (n byLastOctetValue) Swap(i, j int) { n[i], n[j] = n[j], n[i] }
-func (n byLastOctetValue) Less(i, j int) bool {
-	// This case is needed when all ips in the list
-	// have same last octets, Following just ensures that
-	// 127.0.0.1 is moved to the end of the list.
-	if n[i].IsLoopback() {
-		return false
-	}
-	if n[j].IsLoopback() {
-		return true
-	}
-	return []byte(n[i].To4())[3] > []byte(n[j].To4())[3]
-}
-
 // sortIPs - sort ips based on higher octects.
 // The logic to sort by last octet is implemented to
 // prefer CIDRs with higher octects, this in-turn skips the
@@ -152,7 +133,18 @@ func sortIPs(ipList []string) []string {
 		}
 	}
 
-	sort.Sort(byLastOctetValue(ipV4s))
+	sort.Slice(ipV4s, func(i, j int) bool {
+		// This case is needed when all ips in the list
+		// have same last octets, Following just ensures that
+		// 127.0.0.1 is moved to the end of the list.
+		if ipV4s[i].IsLoopback() {
+			return false
+		}
+		if ipV4s[j].IsLoopback() {
+			return true
+		}
+		return []byte(ipV4s[i].To4())[3] > []byte(ipV4s[j].To4())[3]
+	})
 
 	var ips []string
 	for _, ip := range ipV4s {

cmd/object-api-datatypes.go

@@ -552,13 +552,6 @@ type CompletePart struct {
 	ChecksumSHA256 string
 }
 
-// CompletedParts - is a collection satisfying sort.Interface.
-type CompletedParts []CompletePart
-
-func (a CompletedParts) Len() int           { return len(a) }
-func (a CompletedParts) Swap(i, j int)      { a[i], a[j] = a[j], a[i] }
-func (a CompletedParts) Less(i, j int) bool { return a[i].PartNumber < a[j].PartNumber }
-
 // CompleteMultipartUpload - represents list of parts which are completed, this is sent by the
 // client during CompleteMultipartUpload request.
 type CompleteMultipartUpload struct {

cmd/object-multipart-handlers.go

@@ -890,7 +890,9 @@ func (api objectAPIHandlers) CompleteMultipartUploadHandler(w http.ResponseWrite
 		writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrMalformedXML), r.URL)
 		return
 	}
-	if !sort.IsSorted(CompletedParts(complMultipartUpload.Parts)) {
+	if !sort.SliceIsSorted(complMultipartUpload.Parts, func(i, j int) bool {
+		return complMultipartUpload.Parts[i].PartNumber < complMultipartUpload.Parts[j].PartNumber
+	}) {
 		writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrInvalidPartOrder), r.URL)
 		return
 	}

internal/bucket/lifecycle/lifecycle.go

@@ -293,35 +293,6 @@ type Event struct {
 	StorageClass string
 }
 
-type lifecycleEvents []Event
-
-func (es lifecycleEvents) Len() int {
-	return len(es)
-}
-
-func (es lifecycleEvents) Swap(i, j int) {
-	es[i], es[j] = es[j], es[i]
-}
-
-func (es lifecycleEvents) Less(i, j int) bool {
-	if es[i].Due.Equal(es[j].Due) {
-		// Prefer Expiration over Transition for both current and noncurrent
-		// versions
-		switch es[i].Action {
-		case DeleteAction, DeleteVersionAction:
-			return true
-		}
-		switch es[j].Action {
-		case DeleteAction, DeleteVersionAction:
-			return false
-		}
-		return true
-	}
-
-	// Prefer earlier occurring event
-	return es[i].Due.Before(es[j].Due)
-}
-
 // Eval returns the lifecycle event applicable now.
 func (lc Lifecycle) Eval(obj ObjectOpts) Event {
 	return lc.eval(obj, time.Now().UTC())
@@ -451,7 +422,24 @@ func (lc Lifecycle) eval(obj ObjectOpts, now time.Time) Event {
 	}
 
 	if len(events) > 0 {
-		sort.Sort(lifecycleEvents(events))
+		sort.Slice(events, func(i, j int) bool {
+			if events[i].Due.Equal(events[j].Due) {
+				// Prefer Expiration over Transition for both current
+				// and noncurrent versions
+				switch events[i].Action {
+				case DeleteAction, DeleteVersionAction:
+					return true
+				}
+				switch events[j].Action {
+				case DeleteAction, DeleteVersionAction:
+					return false
+				}
+				return true
+			}
+
+			// Prefer earlier occurring event
+			return events[i].Due.Before(events[j].Due)
+		})
 		return events[0]
 	}