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minio/cmd/xl-v1-healing-common_test.go

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/*
* Minio Cloud Storage, (C) 2016, 2017 Minio, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package cmd
import (
"bytes"
"path/filepath"
"testing"
"time"
)
// validates functionality provided to find most common
// time occurrence from a list of time.
func TestCommonTime(t *testing.T) {
// List of test cases for common modTime.
testCases := []struct {
times []time.Time
time time.Time
}{
{
// 1. Tests common times when slice has varying time elements.
[]time.Time{
time.Unix(0, 1).UTC(),
time.Unix(0, 2).UTC(),
time.Unix(0, 3).UTC(),
time.Unix(0, 3).UTC(),
time.Unix(0, 2).UTC(),
time.Unix(0, 3).UTC(),
time.Unix(0, 1).UTC(),
}, time.Unix(0, 3).UTC(),
},
{
// 2. Tests common time obtained when all elements are equal.
[]time.Time{
time.Unix(0, 3).UTC(),
time.Unix(0, 3).UTC(),
time.Unix(0, 3).UTC(),
time.Unix(0, 3).UTC(),
time.Unix(0, 3).UTC(),
time.Unix(0, 3).UTC(),
time.Unix(0, 3).UTC(),
}, time.Unix(0, 3).UTC(),
},
{
// 3. Tests common time obtained when elements have a mixture
// of sentinel values.
[]time.Time{
time.Unix(0, 3).UTC(),
time.Unix(0, 3).UTC(),
time.Unix(0, 2).UTC(),
time.Unix(0, 1).UTC(),
time.Unix(0, 3).UTC(),
time.Unix(0, 4).UTC(),
time.Unix(0, 3).UTC(),
timeSentinel,
timeSentinel,
timeSentinel,
}, time.Unix(0, 3).UTC(),
},
}
// Tests all the testcases, and validates them against expected
// common modtime. Tests fail if modtime does not match.
for i, testCase := range testCases {
// Obtain a common mod time from modTimes slice.
ctime, _ := commonTime(testCase.times)
if testCase.time != ctime {
t.Fatalf("Test case %d, expect to pass but failed. Wanted modTime: %s, got modTime: %s\n", i+1, testCase.time, ctime)
}
}
}
// partsMetaFromModTimes - returns slice of modTimes given metadata of
// an object part.
func partsMetaFromModTimes(modTimes []time.Time, checksums []checkSumInfo) []xlMetaV1 {
var partsMetadata []xlMetaV1
for _, modTime := range modTimes {
partsMetadata = append(partsMetadata, xlMetaV1{
Erasure: erasureInfo{
Checksum: checksums,
},
Stat: statInfo{
ModTime: modTime,
},
Parts: []objectPartInfo{
{
Name: "part.1",
},
},
})
}
return partsMetadata
}
// toPosix - fetches *posix object from StorageAPI.
func toPosix(disk StorageAPI) *posix {
retryDisk, ok := disk.(*retryStorage)
if !ok {
return nil
}
pDisk, ok := retryDisk.remoteStorage.(*posix)
if !ok {
return nil
}
return pDisk
}
// TestListOnlineDisks - checks if listOnlineDisks and outDatedDisks
// are consistent with each other.
func TestListOnlineDisks(t *testing.T) {
rootPath, err := newTestConfig(globalMinioDefaultRegion)
if err != nil {
t.Fatalf("Failed to initialize config - %v", err)
}
defer removeAll(rootPath)
obj, disks, err := prepareXL()
if err != nil {
t.Fatalf("Prepare XL backend failed - %v", err)
}
defer removeRoots(disks)
type tamperKind int
const (
noTamper tamperKind = iota
deletePart tamperKind = iota
corruptPart tamperKind = iota
)
threeNanoSecs := time.Unix(0, 3).UTC()
fourNanoSecs := time.Unix(0, 4).UTC()
modTimesThreeNone := []time.Time{
threeNanoSecs, threeNanoSecs, threeNanoSecs, threeNanoSecs,
threeNanoSecs, threeNanoSecs, threeNanoSecs,
timeSentinel, timeSentinel, timeSentinel, timeSentinel,
timeSentinel, timeSentinel, timeSentinel, timeSentinel,
timeSentinel,
}
modTimesThreeFour := []time.Time{
threeNanoSecs, threeNanoSecs, threeNanoSecs, threeNanoSecs,
threeNanoSecs, threeNanoSecs, threeNanoSecs, threeNanoSecs,
fourNanoSecs, fourNanoSecs, fourNanoSecs, fourNanoSecs,
fourNanoSecs, fourNanoSecs, fourNanoSecs, fourNanoSecs,
}
testCases := []struct {
modTimes []time.Time
expectedTime time.Time
errs []error
_tamperBackend tamperKind
}{
{
modTimes: modTimesThreeFour,
expectedTime: fourNanoSecs,
errs: []error{
nil, nil, nil, nil, nil, nil, nil, nil, nil,
nil, nil, nil, nil, nil, nil, nil,
},
_tamperBackend: noTamper,
},
{
modTimes: modTimesThreeNone,
expectedTime: threeNanoSecs,
errs: []error{
// Disks that have a valid xl.json.
nil, nil, nil, nil, nil, nil, nil,
// Majority of disks don't have xl.json.
errFileNotFound, errFileNotFound,
errFileNotFound, errFileNotFound,
errFileNotFound, errDiskAccessDenied,
errDiskNotFound, errFileNotFound,
errFileNotFound,
},
_tamperBackend: deletePart,
},
{
modTimes: modTimesThreeNone,
expectedTime: threeNanoSecs,
errs: []error{
// Disks that have a valid xl.json.
nil, nil, nil, nil, nil, nil, nil,
// Majority of disks don't have xl.json.
errFileNotFound, errFileNotFound,
errFileNotFound, errFileNotFound,
errFileNotFound, errDiskAccessDenied,
errDiskNotFound, errFileNotFound,
errFileNotFound,
},
_tamperBackend: corruptPart,
},
}
bucket := "bucket"
object := "object"
data := bytes.Repeat([]byte("a"), 1024)
xlDisks := obj.(*xlObjects).storageDisks
for i, test := range testCases {
// Prepare bucket/object backend for the tests below.
// Cleanup from previous test.
obj.DeleteObject(bucket, object)
obj.DeleteBucket(bucket)
err = obj.MakeBucketWithLocation("bucket", "")
if err != nil {
t.Fatalf("Failed to make a bucket %v", err)
}
_, err = obj.PutObject(bucket, object, int64(len(data)), bytes.NewReader(data), nil, "")
if err != nil {
t.Fatalf("Failed to putObject %v", err)
}
// Fetch xl.json from first disk to construct partsMetadata for the tests.
xlMeta, err := readXLMeta(xlDisks[0], bucket, object)
if err != nil {
t.Fatalf("Test %d: Failed to read xl.json %v", i+1, err)
}
tamperedIndex := -1
switch test._tamperBackend {
case deletePart:
for index, err := range test.errs {
if err != nil {
continue
}
// Remove a part from a disk
// which has a valid xl.json,
// and check if that disk
// appears in outDatedDisks.
tamperedIndex = index
dErr := xlDisks[index].DeleteFile(bucket, filepath.Join(object, "part.1"))
if dErr != nil {
t.Fatalf("Test %d: Failed to delete %s - %v", i+1,
filepath.Join(object, "part.1"), dErr)
}
break
}
case corruptPart:
for index, err := range test.errs {
if err != nil {
continue
}
// Corrupt a part from a disk
// which has a valid xl.json,
// and check if that disk
// appears in outDatedDisks.
tamperedIndex = index
dErr := xlDisks[index].AppendFile(bucket, filepath.Join(object, "part.1"), []byte("corruption"))
if dErr != nil {
t.Fatalf("Test %d: Failed to append corrupting data at the end of file %s - %v",
i+1, filepath.Join(object, "part.1"), dErr)
}
break
}
}
partsMetadata := partsMetaFromModTimes(test.modTimes, xlMeta.Erasure.Checksum)
onlineDisks, modTime := listOnlineDisks(xlDisks, partsMetadata, test.errs)
availableDisks, newErrs, _ := disksWithAllParts(onlineDisks, partsMetadata, test.errs, bucket, object)
test.errs = newErrs
outdatedDisks := outDatedDisks(xlDisks, availableDisks, test.errs, partsMetadata, bucket, object)
if modTime.Equal(timeSentinel) {
t.Fatalf("Test %d: modTime should never be equal to timeSentinel, but found equal",
i+1)
}
if test._tamperBackend != noTamper {
if tamperedIndex != -1 && outdatedDisks[tamperedIndex] == nil {
t.Fatalf("Test %d: disk (%v) with part.1 missing is an outdated disk, but wasn't listed by outDatedDisks",
i+1, xlDisks[tamperedIndex])
}
}
if !modTime.Equal(test.expectedTime) {
t.Fatalf("Test %d: Expected modTime to be equal to %v but was found to be %v",
i+1, test.expectedTime, modTime)
}
// Check if a disk is considered both online and outdated,
// which is a contradiction, except if parts are missing.
overlappingDisks := make(map[string]*posix)
for _, availableDisk := range availableDisks {
if availableDisk == nil {
continue
}
pDisk := toPosix(availableDisk)
overlappingDisks[pDisk.diskPath] = pDisk
}
for index, outdatedDisk := range outdatedDisks {
// ignore the intentionally tampered disk,
// this is expected to appear as outdated
// disk, since it doesn't have all the parts.
if index == tamperedIndex {
continue
}
if outdatedDisk == nil {
continue
}
pDisk := toPosix(outdatedDisk)
if _, ok := overlappingDisks[pDisk.diskPath]; ok {
t.Errorf("Test %d: Outdated disk %v was also detected as an online disk - %v %v",
i+1, pDisk, availableDisks, outdatedDisks)
}
// errors other than errFileNotFound doesn't imply that the disk is outdated.
if test.errs[index] != nil && test.errs[index] != errFileNotFound && outdatedDisk != nil {
t.Errorf("Test %d: error (%v) other than errFileNotFound doesn't imply that the disk (%v) could be outdated",
i+1, test.errs[index], pDisk)
}
}
}
}