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/*
* MinIO Cloud Storage, (C) 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 (
"context"
"encoding/json"
"fmt"
"net/http"
"strings"
"sync"
"time"
"github.com/minio/minio/cmd/logger"
"github.com/minio/minio/pkg/madmin"
)
// healStatusSummary - overall short summary of a healing sequence
type healStatusSummary string
// healStatusSummary constants
const (
healNotStartedStatus healStatusSummary = "not started"
healRunningStatus = "running"
healStoppedStatus = "stopped"
healFinishedStatus = "finished"
)
const (
// a heal sequence with this many un-consumed heal result
// items blocks until heal-status consumption resumes or is
// aborted due to timeout.
maxUnconsumedHealResultItems = 1000
// if no heal-results are consumed (via the heal-status API)
// for this timeout duration, the heal sequence is aborted.
healUnconsumedTimeout = 24 * time.Hour
// time-duration to keep heal sequence state after it
// completes.
keepHealSeqStateDuration = time.Minute * 10
// nopHeal is a no operating healing action to
// wait for the current healing operation to finish
nopHeal = ""
)
var (
errHealIdleTimeout = fmt.Errorf("healing results were not consumed for too long")
errHealPushStopNDiscard = fmt.Errorf("heal push stopped due to heal stop signal")
errHealStopSignalled = fmt.Errorf("heal stop signaled")
errFnHealFromAPIErr = func(ctx context.Context, err error) error {
apiErr := toAPIError(ctx, err)
return fmt.Errorf("Heal internal error: %s: %s",
apiErr.Code, apiErr.Description)
}
)
// healSequenceStatus - accumulated status of the heal sequence
type healSequenceStatus struct {
// lock to update this structure as it is concurrently
// accessed
updateLock *sync.RWMutex
// summary and detail for failures
Summary healStatusSummary `json:"Summary"`
FailureDetail string `json:"Detail,omitempty"`
StartTime time.Time `json:"StartTime"`
// disk information
NumDisks int `json:"NumDisks"`
// settings for the heal sequence
HealSettings madmin.HealOpts `json:"Settings"`
// slice of available heal result records
Items []madmin.HealResultItem `json:"Items"`
}
// structure to hold state of all heal sequences in server memory
type allHealState struct {
sync.Mutex
// map of heal path to heal sequence
healSeqMap map[string]*healSequence
}
// initHealState - initialize healing apparatus
func initHealState() *allHealState {
healState := &allHealState{
healSeqMap: make(map[string]*healSequence),
}
go healState.periodicHealSeqsClean()
return healState
}
func (ahs *allHealState) periodicHealSeqsClean() {
// Launch clean-up routine to remove this heal sequence (after
// it ends) from the global state after timeout has elapsed.
ticker := time.NewTicker(time.Minute * 5)
defer ticker.Stop()
for {
select {
case <-ticker.C:
now := UTCNow()
ahs.Lock()
for path, h := range ahs.healSeqMap {
if h.hasEnded() && h.endTime.Add(keepHealSeqStateDuration).Before(now) {
delete(ahs.healSeqMap, path)
}
}
ahs.Unlock()
case <-GlobalServiceDoneCh:
// server could be restarting - need
// to exit immediately
return
}
}
}
// getHealSequenceByToken - Retrieve a heal sequence by token. The second
// argument returns if a heal sequence actually exists.
func (ahs *allHealState) getHealSequenceByToken(token string) (h *healSequence, exists bool) {
ahs.Lock()
defer ahs.Unlock()
for _, healSeq := range ahs.healSeqMap {
if healSeq.clientToken == token {
return healSeq, true
}
}
return nil, false
}
// getHealSequence - Retrieve a heal sequence by path. The second
// argument returns if a heal sequence actually exists.
func (ahs *allHealState) getHealSequence(path string) (h *healSequence, exists bool) {
ahs.Lock()
defer ahs.Unlock()
h, exists = ahs.healSeqMap[path]
return h, exists
}
func (ahs *allHealState) stopHealSequence(path string) ([]byte, APIError) {
var hsp madmin.HealStopSuccess
he, exists := ahs.getHealSequence(path)
if !exists {
hsp = madmin.HealStopSuccess{
ClientToken: "invalid",
StartTime: UTCNow(),
}
} else {
hsp = madmin.HealStopSuccess{
ClientToken: he.clientToken,
ClientAddress: he.clientAddress,
StartTime: he.startTime,
}
he.stop()
for !he.hasEnded() {
time.Sleep(1 * time.Second)
}
ahs.Lock()
defer ahs.Unlock()
// Heal sequence explicitly stopped, remove it.
delete(ahs.healSeqMap, path)
}
b, err := json.Marshal(&hsp)
return b, toAdminAPIErr(context.Background(), err)
}
// LaunchNewHealSequence - launches a background routine that performs
// healing according to the healSequence argument. For each heal
// sequence, state is stored in the `globalAllHealState`, which is a
// map of the heal path to `healSequence` which holds state about the
// heal sequence.
//
// Heal results are persisted in server memory for
// `keepHealSeqStateDuration`. This function also launches a
// background routine to clean up heal results after the
// aforementioned duration.
func (ahs *allHealState) LaunchNewHealSequence(h *healSequence) (
respBytes []byte, apiErr APIError, errMsg string) {
existsAndLive := false
he, exists := ahs.getHealSequence(h.path)
if exists {
if !he.hasEnded() || len(he.currentStatus.Items) > 0 {
existsAndLive = true
}
}
if existsAndLive {
// A heal sequence exists on the given path.
if h.forceStarted {
// stop the running heal sequence - wait for it to finish.
he.stop()
for !he.hasEnded() {
time.Sleep(1 * time.Second)
}
} else {
errMsg = "Heal is already running on the given path " +
"(use force-start option to stop and start afresh). " +
fmt.Sprintf("The heal was started by IP %s at %s, token is %s",
h.clientAddress, h.startTime.Format(http.TimeFormat), h.clientToken)
return nil, errorCodes.ToAPIErr(ErrHealAlreadyRunning), errMsg
}
}
ahs.Lock()
defer ahs.Unlock()
// Check if new heal sequence to be started overlaps with any
// existing, running sequence
for k, hSeq := range ahs.healSeqMap {
if !hSeq.hasEnded() && (strings.HasPrefix(k, h.path) ||
strings.HasPrefix(h.path, k)) {
errMsg = "The provided heal sequence path overlaps with an existing " +
fmt.Sprintf("heal path: %s", k)
return nil, errorCodes.ToAPIErr(ErrHealOverlappingPaths), errMsg
}
}
// Add heal state and start sequence
ahs.healSeqMap[h.path] = h
// Launch top-level background heal go-routine
go h.healSequenceStart()
b, err := json.Marshal(madmin.HealStartSuccess{
ClientToken: h.clientToken,
ClientAddress: h.clientAddress,
StartTime: h.startTime,
})
if err != nil {
logger.LogIf(h.ctx, err)
return nil, toAPIError(h.ctx, err), ""
}
return b, noError, ""
}
// PopHealStatusJSON - Called by heal-status API. It fetches the heal
// status results from global state and returns its JSON
// representation. The clientToken helps ensure there aren't
// conflicting clients fetching status.
func (ahs *allHealState) PopHealStatusJSON(path string,
clientToken string) ([]byte, APIErrorCode) {
// fetch heal state for given path
h, exists := ahs.getHealSequence(path)
if !exists {
// If there is no such heal sequence, return error.
return nil, ErrHealNoSuchProcess
}
// Check if client-token is valid
if clientToken != h.clientToken {
return nil, ErrHealInvalidClientToken
}
// Take lock to access and update the heal-sequence
h.currentStatus.updateLock.Lock()
defer h.currentStatus.updateLock.Unlock()
numItems := len(h.currentStatus.Items)
// calculate index of most recently available heal result
// record.
lastResultIndex := h.lastSentResultIndex
if numItems > 0 {
lastResultIndex = h.currentStatus.Items[numItems-1].ResultIndex
}
// After sending status to client, and before relinquishing
// the updateLock, reset Item to nil and record the result
// index sent to the client.
defer func(i int64) {
h.lastSentResultIndex = i
h.currentStatus.Items = nil
}(lastResultIndex)
jbytes, err := json.Marshal(h.currentStatus)
if err != nil {
logger.LogIf(h.ctx, err)
return nil, ErrInternalError
}
return jbytes, ErrNone
}
// healSequence - state for each heal sequence initiated on the
// server.
type healSequence struct {
// bucket, and prefix on which heal seq. was initiated
bucket, objPrefix string
// path is just pathJoin(bucket, objPrefix)
path string
// List of entities (format, buckets, objects) to heal
sourceCh chan string
// Report healing progress, false if this is a background
// healing since currently there is no entity which will
// receive realtime healing status
reportProgress bool
// time at which heal sequence was started
startTime time.Time
// time at which heal sequence has ended
endTime time.Time
// Heal client info
clientToken, clientAddress string
// was this heal sequence force started?
forceStarted bool
// heal settings applied to this heal sequence
settings madmin.HealOpts
// current accumulated status of the heal sequence
currentStatus healSequenceStatus
// channel signaled by background routine when traversal has
// completed
traverseAndHealDoneCh chan error
// channel to signal heal sequence to stop (e.g. from the
// heal-stop API)
stopSignalCh chan struct{}
// the last result index sent to client
lastSentResultIndex int64
// Number of total items scanned
scannedItemsCount int64
// The time of the last scan/heal activity
lastHealActivity time.Time
// Holds the request-info for logging
ctx context.Context
}
// NewHealSequence - creates healSettings, assumes bucket and
// objPrefix are already validated.
func newHealSequence(bucket, objPrefix, clientAddr string,
numDisks int, hs madmin.HealOpts, forceStart bool) *healSequence {
reqInfo := &logger.ReqInfo{RemoteHost: clientAddr, API: "Heal", BucketName: bucket}
reqInfo.AppendTags("prefix", objPrefix)
ctx := logger.SetReqInfo(context.Background(), reqInfo)
return &healSequence{
bucket: bucket,
objPrefix: objPrefix,
path: pathJoin(bucket, objPrefix),
reportProgress: true,
startTime: UTCNow(),
clientToken: mustGetUUID(),
clientAddress: clientAddr,
forceStarted: forceStart,
settings: hs,
currentStatus: healSequenceStatus{
Summary: healNotStartedStatus,
HealSettings: hs,
NumDisks: numDisks,
updateLock: &sync.RWMutex{},
},
traverseAndHealDoneCh: make(chan error),
stopSignalCh: make(chan struct{}),
ctx: ctx,
}
}
// isQuitting - determines if the heal sequence is quitting (due to an
// external signal)
func (h *healSequence) isQuitting() bool {
select {
case <-h.stopSignalCh:
return true
default:
return false
}
}
// check if the heal sequence has ended
func (h *healSequence) hasEnded() bool {
h.currentStatus.updateLock.RLock()
summary := h.currentStatus.Summary
h.currentStatus.updateLock.RUnlock()
return summary == healStoppedStatus || summary == healFinishedStatus
}
// stops the heal sequence - safe to call multiple times.
func (h *healSequence) stop() {
select {
case <-h.stopSignalCh:
default:
close(h.stopSignalCh)
}
}
// pushHealResultItem - pushes a heal result item for consumption in
// the heal-status API. It blocks if there are
// maxUnconsumedHealResultItems. When it blocks, the heal sequence
// routine is effectively paused - this happens when the server has
// accumulated the maximum number of heal records per heal
// sequence. When the client consumes further records, the heal
// sequence automatically resumes. The return value indicates if the
// operation succeeded.
func (h *healSequence) pushHealResultItem(r madmin.HealResultItem) error {
// start a timer to keep an upper time limit to find an empty
// slot to add the given heal result - if no slot is found it
// means that the server is holding the maximum amount of
// heal-results in memory and the client has not consumed it
// for too long.
unconsumedTimer := time.NewTimer(healUnconsumedTimeout)
defer func() {
// stop the timeout timer so it is garbage collected.
if !unconsumedTimer.Stop() {
<-unconsumedTimer.C
}
}()
var itemsLen int
for {
h.currentStatus.updateLock.Lock()
itemsLen = len(h.currentStatus.Items)
if itemsLen == maxUnconsumedHealResultItems {
// unlock and wait to check again if we can push
h.currentStatus.updateLock.Unlock()
// wait for a second, or quit if an external
// stop signal is received or the
// unconsumedTimer fires.
select {
// Check after a second
case <-time.After(time.Second):
continue
case <-h.stopSignalCh:
// discard result and return.
return errHealPushStopNDiscard
// Timeout if no results consumed for too
// long.
case <-unconsumedTimer.C:
return errHealIdleTimeout
}
}
break
}
// Set the correct result index for the new result item
if itemsLen > 0 {
r.ResultIndex = 1 + h.currentStatus.Items[itemsLen-1].ResultIndex
} else {
r.ResultIndex = 1 + h.lastSentResultIndex
}
// append to results
h.currentStatus.Items = append(h.currentStatus.Items, r)
// release lock
h.currentStatus.updateLock.Unlock()
// This is a "safe" point for the heal sequence to quit if
// signaled externally.
if h.isQuitting() {
return errHealStopSignalled
}
return nil
}
// healSequenceStart - this is the top-level background heal
// routine. It launches another go-routine that actually traverses
// on-disk data, checks and heals according to the selected
// settings. This go-routine itself, (1) monitors the traversal
// routine for completion, and (2) listens for external stop
// signals. When either event happens, it sets the finish status for
// the heal-sequence.
func (h *healSequence) healSequenceStart() {
// Set status as running
h.currentStatus.updateLock.Lock()
h.currentStatus.Summary = healRunningStatus
h.currentStatus.StartTime = UTCNow()
h.currentStatus.updateLock.Unlock()
if h.sourceCh == nil {
go h.traverseAndHeal()
} else {
go h.healFromSourceCh()
}
select {
case err, ok := <-h.traverseAndHealDoneCh:
h.endTime = UTCNow()
h.currentStatus.updateLock.Lock()
defer h.currentStatus.updateLock.Unlock()
// Heal traversal is complete.
if ok {
// heal traversal had an error.
h.currentStatus.Summary = healStoppedStatus
h.currentStatus.FailureDetail = err.Error()
} else {
// heal traversal succeeded.
h.currentStatus.Summary = healFinishedStatus
}
case <-h.stopSignalCh:
h.endTime = UTCNow()
h.currentStatus.updateLock.Lock()
h.currentStatus.Summary = healStoppedStatus
h.currentStatus.FailureDetail = errHealStopSignalled.Error()
h.currentStatus.updateLock.Unlock()
// drain traverse channel so the traversal
// go-routine does not leak.
go func() {
// Eventually the traversal go-routine closes
// the channel and returns, so this go-routine
// itself will not leak.
<-h.traverseAndHealDoneCh
}()
}
}
func (h *healSequence) queueHealTask(path string, healType madmin.HealItemType) error {
var respCh = make(chan healResult)
defer close(respCh)
// Send heal request
globalBackgroundHealRoutine.queueHealTask(healTask{path: path, responseCh: respCh, opts: h.settings})
// Wait for answer and push result to the client
res := <-respCh
if !h.reportProgress {
return nil
}
res.result.Type = healType
if res.err != nil {
// Object might have been deleted, by the time heal
// was attempted, we should ignore this object and return success.
if isErrObjectNotFound(res.err) {
return nil
}
// Only report object error
if healType != madmin.HealItemObject {
return res.err
}
res.result.Detail = res.err.Error()
}
return h.pushHealResultItem(res.result)
}
func (h *healSequence) healItemsFromSourceCh() error {
h.lastHealActivity = UTCNow()
bucketsOnly := true // heal buckets only, not objects.
if err := h.healItems(bucketsOnly); err != nil {
logger.LogIf(h.ctx, err)
}
for {
select {
case path := <-h.sourceCh:
var itemType madmin.HealItemType
switch {
case path == nopHeal:
continue
case path == SlashSeparator:
itemType = madmin.HealItemMetadata
case !strings.Contains(path, SlashSeparator):
itemType = madmin.HealItemBucket
default:
itemType = madmin.HealItemObject
}
if err := h.queueHealTask(path, itemType); err != nil {
logger.LogIf(h.ctx, err)
}
h.scannedItemsCount++
h.lastHealActivity = UTCNow()
case <-h.traverseAndHealDoneCh:
return nil
case <-GlobalServiceDoneCh:
return nil
}
}
}
func (h *healSequence) healFromSourceCh() {
h.healItemsFromSourceCh()
close(h.traverseAndHealDoneCh)
}
func (h *healSequence) healItems(bucketsOnly bool) error {
// Start with format healing
if err := h.healDiskFormat(); err != nil {
return err
}
// Start healing the config prefix.
if err := h.healMinioSysMeta(minioConfigPrefix)(); err != nil {
return err
}
// Start healing the bucket config prefix.
if err := h.healMinioSysMeta(bucketConfigPrefix)(); err != nil {
return err
}
// Start healing the background ops prefix.
if err := h.healMinioSysMeta(backgroundOpsMetaPrefix)(); err != nil {
logger.LogIf(h.ctx, err)
}
// Heal buckets and objects
return h.healBuckets(bucketsOnly)
}
// traverseAndHeal - traverses on-disk data and performs healing
// according to settings. At each "safe" point it also checks if an
// external quit signal has been received and quits if so. Since the
// healing traversal may be mutating on-disk data when an external
// quit signal is received, this routine cannot quit immediately and
// has to wait until a safe point is reached, such as between scanning
// two objects.
func (h *healSequence) traverseAndHeal() {
bucketsOnly := false // Heals buckets and objects also.
if err := h.healItems(bucketsOnly); err != nil {
if h.isQuitting() {
err = errHealStopSignalled
}
h.traverseAndHealDoneCh <- err
}
close(h.traverseAndHealDoneCh)
}
// healMinioSysMeta - heals all files under a given meta prefix, returns a function
// which in-turn heals the respective meta directory path and any files in int.
func (h *healSequence) healMinioSysMeta(metaPrefix string) func() error {
return func() error {
// Get current object layer instance.
objectAPI := newObjectLayerWithoutSafeModeFn()
if objectAPI == nil {
return errServerNotInitialized
}
// NOTE: Healing on meta is run regardless
// of any bucket being selected, this is to ensure that
// meta are always upto date and correct.
return objectAPI.HealObjects(h.ctx, minioMetaBucket, metaPrefix, func(bucket string, object string) error {
if h.isQuitting() {
return errHealStopSignalled
}
herr := h.queueHealTask(pathJoin(bucket, object), madmin.HealItemBucketMetadata)
// Object might have been deleted, by the time heal
// was attempted we ignore this object an move on.
if isErrObjectNotFound(herr) {
return nil
}
return herr
})
}
}
// healDiskFormat - heals format.json, return value indicates if a
// failure error occurred.
func (h *healSequence) healDiskFormat() error {
if h.isQuitting() {
return errHealStopSignalled
}
// Get current object layer instance.
objectAPI := newObjectLayerWithoutSafeModeFn()
if objectAPI == nil {
return errServerNotInitialized
}
return h.queueHealTask(SlashSeparator, madmin.HealItemMetadata)
}
// healBuckets - check for all buckets heal or just particular bucket.
func (h *healSequence) healBuckets(bucketsOnly bool) error {
if h.isQuitting() {
return errHealStopSignalled
}
// 1. If a bucket was specified, heal only the bucket.
if h.bucket != "" {
return h.healBucket(h.bucket, bucketsOnly)
}
// Get current object layer instance.
objectAPI := newObjectLayerWithoutSafeModeFn()
if objectAPI == nil {
return errServerNotInitialized
}
buckets, err := objectAPI.ListBucketsHeal(h.ctx)
if err != nil {
return errFnHealFromAPIErr(h.ctx, err)
}
for _, bucket := range buckets {
if err = h.healBucket(bucket.Name, bucketsOnly); err != nil {
return err
}
}
return nil
}
// healBucket - traverses and heals given bucket
func (h *healSequence) healBucket(bucket string, bucketsOnly bool) error {
// Get current object layer instance.
objectAPI := newObjectLayerWithoutSafeModeFn()
if objectAPI == nil {
return errServerNotInitialized
}
if err := h.queueHealTask(bucket, madmin.HealItemBucket); err != nil {
return err
}
if bucketsOnly {
return nil
}
if !h.settings.Recursive {
if h.objPrefix != "" {
// Check if an object named as the objPrefix exists,
// and if so heal it.
_, err := objectAPI.GetObjectInfo(h.ctx, bucket, h.objPrefix, ObjectOptions{})
if err == nil {
if err = h.healObject(bucket, h.objPrefix); err != nil {
return err
}
}
}
return nil
}
if err := objectAPI.HealObjects(h.ctx, bucket, h.objPrefix, h.healObject); err != nil {
return errFnHealFromAPIErr(h.ctx, err)
}
return nil
}
// healObject - heal the given object and record result
func (h *healSequence) healObject(bucket, object string) error {
if h.isQuitting() {
return errHealStopSignalled
}
// Get current object layer instance.
objectAPI := newObjectLayerWithoutSafeModeFn()
if objectAPI == nil {
return errServerNotInitialized
}
return h.queueHealTask(pathJoin(bucket, object), madmin.HealItemObject)
}