Rename getUUID() into mustGetUUID() (#3320)

In case of UUID generation failure mustGetUUID() will panic than
infinitely trying in for loop.

cmd/format-config-v1.go

@@ -506,7 +506,7 @@ func healFormatXLFreshDisks(storageDisks []StorageAPI) error {
 	// From ordered disks fill the UUID position.
 	for index, disk := range orderedDisks {
 		if disk == nil {
-			newJBOD[index] = getUUID()
+			newJBOD[index] = mustGetUUID()
 		}
 	}
 
@@ -696,7 +696,7 @@ func healFormatXLCorruptedDisks(storageDisks []StorageAPI) error {
 	// From ordered disks fill the UUID position.
 	for index, disk := range orderedDisks {
 		if disk == nil {
-			newJBOD[index] = getUUID()
+			newJBOD[index] = mustGetUUID()
 		}
 	}
 
@@ -889,7 +889,7 @@ func initFormatXL(storageDisks []StorageAPI) (err error) {
 			Format:  "xl",
 			XL: &xlFormat{
 				Version: "1",
-				Disk:    getUUID(),
+				Disk:    mustGetUUID(),
 			},
 		}
 		jbod[index] = formats[index].XL.Disk

cmd/format-config-v1_test.go

@@ -26,7 +26,7 @@ func genFormatXLValid() []*formatConfigV1 {
 	jbod := make([]string, 8)
 	formatConfigs := make([]*formatConfigV1, 8)
 	for index := range jbod {
-		jbod[index] = getUUID()
+		jbod[index] = mustGetUUID()
 	}
 	for index := range jbod {
 		formatConfigs[index] = &formatConfigV1{
@@ -47,7 +47,7 @@ func genFormatXLInvalidVersion() []*formatConfigV1 {
 	jbod := make([]string, 8)
 	formatConfigs := make([]*formatConfigV1, 8)
 	for index := range jbod {
-		jbod[index] = getUUID()
+		jbod[index] = mustGetUUID()
 	}
 	for index := range jbod {
 		formatConfigs[index] = &formatConfigV1{
@@ -71,7 +71,7 @@ func genFormatXLInvalidFormat() []*formatConfigV1 {
 	jbod := make([]string, 8)
 	formatConfigs := make([]*formatConfigV1, 8)
 	for index := range jbod {
-		jbod[index] = getUUID()
+		jbod[index] = mustGetUUID()
 	}
 	for index := range jbod {
 		formatConfigs[index] = &formatConfigV1{
@@ -95,7 +95,7 @@ func genFormatXLInvalidXLVersion() []*formatConfigV1 {
 	jbod := make([]string, 8)
 	formatConfigs := make([]*formatConfigV1, 8)
 	for index := range jbod {
-		jbod[index] = getUUID()
+		jbod[index] = mustGetUUID()
 	}
 	for index := range jbod {
 		formatConfigs[index] = &formatConfigV1{
@@ -126,7 +126,7 @@ func genFormatXLInvalidJBODCount() []*formatConfigV1 {
 	jbod := make([]string, 7)
 	formatConfigs := make([]*formatConfigV1, 8)
 	for index := range jbod {
-		jbod[index] = getUUID()
+		jbod[index] = mustGetUUID()
 	}
 	for index := range jbod {
 		formatConfigs[index] = &formatConfigV1{
@@ -147,7 +147,7 @@ func genFormatXLInvalidJBOD() []*formatConfigV1 {
 	jbod := make([]string, 8)
 	formatConfigs := make([]*formatConfigV1, 8)
 	for index := range jbod {
-		jbod[index] = getUUID()
+		jbod[index] = mustGetUUID()
 	}
 	for index := range jbod {
 		formatConfigs[index] = &formatConfigV1{
@@ -161,7 +161,7 @@ func genFormatXLInvalidJBOD() []*formatConfigV1 {
 		}
 	}
 	for index := range jbod {
-		jbod[index] = getUUID()
+		jbod[index] = mustGetUUID()
 	}
 	// Corrupt JBOD entries on disk 6 and disk 8.
 	formatConfigs[5].XL.JBOD = jbod
@@ -174,7 +174,7 @@ func genFormatXLInvalidDisks() []*formatConfigV1 {
 	jbod := make([]string, 8)
 	formatConfigs := make([]*formatConfigV1, 8)
 	for index := range jbod {
-		jbod[index] = getUUID()
+		jbod[index] = mustGetUUID()
 	}
 	for index := range jbod {
 		formatConfigs[index] = &formatConfigV1{
@@ -188,8 +188,8 @@ func genFormatXLInvalidDisks() []*formatConfigV1 {
 		}
 	}
 	// Make disk 5 and disk 8 have inconsistent disk uuid's.
-	formatConfigs[4].XL.Disk = getUUID()
-	formatConfigs[7].XL.Disk = getUUID()
+	formatConfigs[4].XL.Disk = mustGetUUID()
+	formatConfigs[7].XL.Disk = mustGetUUID()
 	return formatConfigs
 }
 
@@ -198,7 +198,7 @@ func genFormatXLInvalidDisksOrder() []*formatConfigV1 {
 	jbod := make([]string, 8)
 	formatConfigs := make([]*formatConfigV1, 8)
 	for index := range jbod {
-		jbod[index] = getUUID()
+		jbod[index] = mustGetUUID()
 	}
 	for index := range jbod {
 		formatConfigs[index] = &formatConfigV1{
@@ -559,7 +559,7 @@ func TestSavedUUIDOrder(t *testing.T) {
 	jbod := make([]string, 8)
 	formatConfigs := make([]*formatConfigV1, 8)
 	for index := range jbod {
-		jbod[index] = getUUID()
+		jbod[index] = mustGetUUID()
 		uuidTestCases[index].uuid = jbod[index]
 		uuidTestCases[index].shouldPass = true
 	}

cmd/fs-v1-metadata.go

@@ -92,7 +92,7 @@ func readFSMetadata(disk StorageAPI, bucket, filePath string) (fsMeta fsMetaV1,
 
 // Write fsMeta to fs.json or fs-append.json.
 func writeFSMetadata(disk StorageAPI, bucket, filePath string, fsMeta fsMetaV1) error {
-	tmpPath := getUUID()
+	tmpPath := mustGetUUID()
 	metadataBytes, err := json.Marshal(fsMeta)
 	if err != nil {
 		return traceError(err)

cmd/fs-v1-multipart-common.go

@@ -58,7 +58,7 @@ func (fs fsObjects) isUploadIDExists(bucket, object, uploadID string) bool {
 // updateUploadJSON - add or remove upload ID info in all `uploads.json`.
 func (fs fsObjects) updateUploadJSON(bucket, object, uploadID string, initiated time.Time, isRemove bool) error {
 	uploadsPath := path.Join(bucket, object, uploadsJSONFile)
-	tmpUploadsPath := getUUID()
+	tmpUploadsPath := mustGetUUID()
 
 	uploadsJSON, err := readUploadsJSON(bucket, object, fs.storage)
 	if errorCause(err) == errFileNotFound {

cmd/fs-v1-multipart.go

@@ -236,7 +236,7 @@ func (fs fsObjects) newMultipartUpload(bucket string, object string, meta map[st
 	objectMPartPathLock.Lock()
 	defer objectMPartPathLock.Unlock()
 
-	uploadID = getUUID()
+	uploadID = mustGetUUID()
 	initiated := time.Now().UTC()
 	// Add upload ID to uploads.json
 	if err = fs.addUploadID(bucket, object, uploadID, initiated); err != nil {
@@ -319,7 +319,7 @@ func (fs fsObjects) PutObjectPart(bucket, object, uploadID string, partID int, s
 	}
 
 	partSuffix := fmt.Sprintf("object%d", partID)
-	tmpPartPath := uploadID + "." + getUUID() + "." + partSuffix
+	tmpPartPath := uploadID + "." + mustGetUUID() + "." + partSuffix
 
 	// Initialize md5 writer.
 	md5Writer := md5.New()

cmd/fs-v1.go

@@ -354,7 +354,7 @@ func (fs fsObjects) PutObject(bucket string, object string, size int64, data io.
 		metadata = make(map[string]string)
 	}
 
-	uniqueID := getUUID()
+	uniqueID := mustGetUUID()
 
 	// Uploaded object will first be written to the temporary location which will eventually
 	// be renamed to the actual location. It is first written to the temporary location

cmd/object-utils.go

@@ -127,18 +127,14 @@ func pathJoin(elem ...string) string {
 	return path.Join(elem...) + trailingSlash
 }
 
-// getUUID() - get a unique uuid.
-func getUUID() (uuidStr string) {
-	for {
+// mustGetUUID - get a random UUID.
+func mustGetUUID() string {
 	uuid, err := uuid.New()
 	if err != nil {
-			errorIf(err, "Unable to initialize uuid")
-			continue
+		panic(fmt.Sprintf("Random UUID generation failed. Error: %s", err))
 	}
-		uuidStr = uuid.String()
-		break
-	}
-	return uuidStr
+
+	return uuid.String()
 }
 
 // Create an s3 compatible MD5sum for complete multipart transaction.

cmd/xl-v1-healing.go

@@ -276,7 +276,7 @@ func healObject(storageDisks []StorageAPI, bucket string, object string, quorum
 	partsMetadata = getOrderedPartsMetadata(latestMeta.Erasure.Distribution, partsMetadata)
 
 	// We write at temporary location and then rename to fianal location.
-	tmpID := getUUID()
+	tmpID := mustGetUUID()
 
 	// Checksum of the part files. checkSumInfos[index] will contain checksums
 	// of all the part files in the outDatedDisks[index]

cmd/xl-v1-multipart-common.go

@@ -25,7 +25,7 @@ import (
 // updateUploadJSON - add or remove upload ID info in all `uploads.json`.
 func (xl xlObjects) updateUploadJSON(bucket, object, uploadID string, initiated time.Time, isRemove bool) error {
 	uploadsPath := path.Join(bucket, object, uploadsJSONFile)
-	tmpUploadsPath := getUUID()
+	tmpUploadsPath := mustGetUUID()
 
 	// slice to store errors from disks
 	errs := make([]error, len(xl.storageDisks))

cmd/xl-v1-multipart.go

@@ -286,7 +286,7 @@ func (xl xlObjects) newMultipartUpload(bucket string, object string, meta map[st
 	objectMPartPathLock.Lock()
 	defer objectMPartPathLock.Unlock()
 
-	uploadID := getUUID()
+	uploadID := mustGetUUID()
 	uploadIDPath := path.Join(bucket, object, uploadID)
 	tempUploadIDPath := uploadID
 	// Write updated `xl.json` to all disks.
@@ -393,9 +393,8 @@ func (xl xlObjects) PutObjectPart(bucket, object, uploadID string, partID int, s
 	// accommodate concurrent PutObjectPart requests
 
 	partSuffix := fmt.Sprintf("part.%d", partID)
-	tmpSuffix := getUUID()
-	tmpPart := tmpSuffix
-	tmpPartPath := path.Join(tmpSuffix, partSuffix)
+	tmpPart := mustGetUUID()
+	tmpPartPath := path.Join(tmpPart, partSuffix)
 
 	// Initialize md5 writer.
 	md5Writer := md5.New()
@@ -521,7 +520,7 @@ func (xl xlObjects) PutObjectPart(bucket, object, uploadID string, partID int, s
 	}
 
 	// Write all the checksum metadata.
-	newUUID := getUUID()
+	newUUID := mustGetUUID()
 	tempXLMetaPath := newUUID
 
 	// Writes a unique `xl.json` each disk carrying new checksum related information.
@@ -798,7 +797,7 @@ func (xl xlObjects) CompleteMultipartUpload(bucket string, object string, upload
 	}()
 
 	// Rename if an object already exists to temporary location.
-	uniqueID := getUUID()
+	uniqueID := mustGetUUID()
 	if xl.isObject(bucket, object) {
 		// NOTE: Do not use online disks slice here.
 		// The reason is that existing object should be purged

cmd/xl-v1-object.go

@@ -384,7 +384,7 @@ func (xl xlObjects) PutObject(bucket string, object string, size int64, data io.
 		metadata = make(map[string]string)
 	}
 
-	uniqueID := getUUID()
+	uniqueID := mustGetUUID()
 	tempErasureObj := path.Join(uniqueID, "part.1")
 	tempObj := uniqueID
 
@@ -518,7 +518,7 @@ func (xl xlObjects) PutObject(bucket string, object string, size int64, data io.
 	}
 
 	// Rename if an object already exists to temporary location.
-	newUniqueID := getUUID()
+	newUniqueID := mustGetUUID()
 	if xl.isObject(bucket, object) {
 		// Delete the temporary copy of the object that existed before this PutObject request.
 		defer xl.deleteObject(minioMetaTmpBucket, newUniqueID)