storj/satellite/audit/verifier.go
Michał Niewrzał 237782813b Merge remote-tracking branch 'origin/multipart-upload'
Change-Id: If6c5a450b238adab55d1e0dea67d01e5f5768a9f
2021-03-23 09:44:49 +01:00

864 lines
30 KiB
Go

// Copyright (C) 2019 Storj Labs, Inc.
// See LICENSE for copying information.
package audit
import (
"bytes"
"context"
"io"
"math/rand"
"time"
"github.com/spacemonkeygo/monkit/v3"
"github.com/vivint/infectious"
"github.com/zeebo/errs"
"go.uber.org/zap"
"storj.io/common/errs2"
"storj.io/common/identity"
"storj.io/common/memory"
"storj.io/common/pb"
"storj.io/common/pkcrypto"
"storj.io/common/rpc"
"storj.io/common/rpc/rpcstatus"
"storj.io/common/storj"
"storj.io/storj/satellite/metainfo"
"storj.io/storj/satellite/metainfo/metabase"
"storj.io/storj/satellite/orders"
"storj.io/storj/satellite/overlay"
"storj.io/uplink/private/piecestore"
)
var (
mon = monkit.Package()
// ErrNotEnoughShares is the errs class for when not enough shares are available to do an audit.
ErrNotEnoughShares = errs.Class("not enough shares for successful audit")
// ErrSegmentDeleted is the errs class when the audited segment was deleted during the audit.
ErrSegmentDeleted = errs.Class("segment deleted during audit")
// ErrSegmentModified is the errs class used when a segment has been changed in any way.
ErrSegmentModified = errs.Class("segment has been modified")
)
// Share represents required information about an audited share.
type Share struct {
Error error
PieceNum int
NodeID storj.NodeID
Data []byte
}
// Verifier helps verify the correctness of a given stripe.
//
// architecture: Worker
type Verifier struct {
log *zap.Logger
metabase metainfo.MetabaseDB
orders *orders.Service
auditor *identity.PeerIdentity
dialer rpc.Dialer
overlay *overlay.Service
containment Containment
minBytesPerSecond memory.Size
minDownloadTimeout time.Duration
nowFn func() time.Time
OnTestingCheckSegmentAlteredHook func()
}
// NewVerifier creates a Verifier.
func NewVerifier(log *zap.Logger, metabase metainfo.MetabaseDB, dialer rpc.Dialer, overlay *overlay.Service, containment Containment, orders *orders.Service, id *identity.FullIdentity, minBytesPerSecond memory.Size, minDownloadTimeout time.Duration) *Verifier {
return &Verifier{
log: log,
metabase: metabase,
orders: orders,
auditor: id.PeerIdentity(),
dialer: dialer,
overlay: overlay,
containment: containment,
minBytesPerSecond: minBytesPerSecond,
minDownloadTimeout: minDownloadTimeout,
nowFn: time.Now,
}
}
// Verify downloads shares then verifies the data correctness at a random stripe.
func (verifier *Verifier) Verify(ctx context.Context, segment Segment, skip map[storj.NodeID]bool) (report Report, err error) {
defer mon.Task()(&ctx)(&err)
if segment.Expired(verifier.nowFn()) {
verifier.log.Debug("segment expired before Verify")
return Report{}, nil
}
segmentInfo, err := verifier.metabase.GetSegmentByPosition(ctx, metabase.GetSegmentByPosition{
StreamID: segment.StreamID,
Position: segment.Position,
})
if err != nil {
if metabase.ErrSegmentNotFound.Has(err) {
verifier.log.Debug("segment deleted before Verify")
return Report{}, nil
}
return Report{}, err
}
randomIndex, err := GetRandomStripe(ctx, segmentInfo)
if err != nil {
return Report{}, err
}
var offlineNodes storj.NodeIDList
var failedNodes storj.NodeIDList
var unknownNodes storj.NodeIDList
containedNodes := make(map[int]storj.NodeID)
sharesToAudit := make(map[int]Share)
orderLimits, privateKey, cachedIPsAndPorts, err := verifier.orders.CreateAuditOrderLimits(ctx, segment.Bucket(), segmentInfo, skip)
if err != nil {
return Report{}, err
}
// NOTE offlineNodes will include disqualified nodes because they aren't in
// the skip list
offlineNodes = getOfflineNodes(segmentInfo, orderLimits, skip)
if len(offlineNodes) > 0 {
verifier.log.Debug("Verify: order limits not created for some nodes (offline/disqualified)",
zap.Strings("Node IDs", offlineNodes.Strings()))
}
shares, err := verifier.DownloadShares(ctx, orderLimits, privateKey, cachedIPsAndPorts, randomIndex, segmentInfo.Redundancy.ShareSize)
if err != nil {
return Report{
Offlines: offlineNodes,
}, err
}
err = verifier.checkIfSegmentAltered(ctx, segment.SegmentLocation, segmentInfo)
if err != nil {
if ErrSegmentDeleted.Has(err) {
verifier.log.Debug("segment deleted during Verify")
return Report{}, nil
}
if ErrSegmentModified.Has(err) {
verifier.log.Debug("segment modified during Verify")
return Report{}, nil
}
return Report{
Offlines: offlineNodes,
}, err
}
for pieceNum, share := range shares {
if share.Error == nil {
// no error -- share downloaded successfully
sharesToAudit[pieceNum] = share
continue
}
if rpc.Error.Has(share.Error) {
if errs.Is(share.Error, context.DeadlineExceeded) {
// dial timeout
offlineNodes = append(offlineNodes, share.NodeID)
verifier.log.Debug("Verify: dial timeout (offline)",
zap.Stringer("Node ID", share.NodeID),
zap.Error(share.Error))
continue
}
if errs2.IsRPC(share.Error, rpcstatus.Unknown) {
// dial failed -- offline node
offlineNodes = append(offlineNodes, share.NodeID)
verifier.log.Debug("Verify: dial failed (offline)",
zap.Stringer("Node ID", share.NodeID),
zap.Error(share.Error))
continue
}
// unknown transport error
unknownNodes = append(unknownNodes, share.NodeID)
verifier.log.Info("Verify: unknown transport error (skipped)",
zap.Stringer("Node ID", share.NodeID),
zap.Error(share.Error))
continue
}
if errs2.IsRPC(share.Error, rpcstatus.NotFound) {
// missing share
failedNodes = append(failedNodes, share.NodeID)
verifier.log.Info("Verify: piece not found (audit failed)",
zap.Stringer("Node ID", share.NodeID),
zap.Error(share.Error))
continue
}
if errs2.IsRPC(share.Error, rpcstatus.DeadlineExceeded) {
// dial successful, but download timed out
containedNodes[pieceNum] = share.NodeID
verifier.log.Info("Verify: download timeout (contained)",
zap.Stringer("Node ID", share.NodeID),
zap.Error(share.Error))
continue
}
// unknown error
unknownNodes = append(unknownNodes, share.NodeID)
verifier.log.Info("Verify: unknown error (skipped)",
zap.Stringer("Node ID", share.NodeID),
zap.Error(share.Error))
}
mon.IntVal("verify_shares_downloaded_successfully").Observe(int64(len(sharesToAudit))) //mon:locked
required := segmentInfo.Redundancy.RequiredShares
total := segmentInfo.Redundancy.TotalShares
if len(sharesToAudit) < int(required) {
mon.Counter("not_enough_shares_for_audit").Inc(1)
return Report{
Fails: failedNodes,
Offlines: offlineNodes,
Unknown: unknownNodes,
}, ErrNotEnoughShares.New("got %d, required %d", len(sharesToAudit), required)
}
// ensure we get values, even if only zero values, so that redash can have an alert based on this
mon.Counter("not_enough_shares_for_audit").Inc(0)
pieceNums, correctedShares, err := auditShares(ctx, required, total, sharesToAudit)
if err != nil {
return Report{
Fails: failedNodes,
Offlines: offlineNodes,
Unknown: unknownNodes,
}, err
}
for _, pieceNum := range pieceNums {
verifier.log.Info("Verify: share data altered (audit failed)",
zap.Stringer("Node ID", shares[pieceNum].NodeID))
failedNodes = append(failedNodes, shares[pieceNum].NodeID)
}
successNodes := getSuccessNodes(ctx, shares, failedNodes, offlineNodes, unknownNodes, containedNodes)
totalInSegment := len(segmentInfo.Pieces)
numOffline := len(offlineNodes)
numSuccessful := len(successNodes)
numFailed := len(failedNodes)
numContained := len(containedNodes)
numUnknown := len(unknownNodes)
totalAudited := numSuccessful + numFailed + numOffline + numContained
auditedPercentage := float64(totalAudited) / float64(totalInSegment)
offlinePercentage := float64(0)
successfulPercentage := float64(0)
failedPercentage := float64(0)
containedPercentage := float64(0)
unknownPercentage := float64(0)
if totalAudited > 0 {
offlinePercentage = float64(numOffline) / float64(totalAudited)
successfulPercentage = float64(numSuccessful) / float64(totalAudited)
failedPercentage = float64(numFailed) / float64(totalAudited)
containedPercentage = float64(numContained) / float64(totalAudited)
unknownPercentage = float64(numUnknown) / float64(totalAudited)
}
mon.Meter("audit_success_nodes_global").Mark(numSuccessful) //mon:locked
mon.Meter("audit_fail_nodes_global").Mark(numFailed) //mon:locked
mon.Meter("audit_offline_nodes_global").Mark(numOffline) //mon:locked
mon.Meter("audit_contained_nodes_global").Mark(numContained) //mon:locked
mon.Meter("audit_unknown_nodes_global").Mark(numUnknown) //mon:locked
mon.Meter("audit_total_nodes_global").Mark(totalAudited) //mon:locked
mon.Meter("audit_total_pointer_nodes_global").Mark(totalInSegment) //mon:locked
mon.IntVal("audit_success_nodes").Observe(int64(numSuccessful)) //mon:locked
mon.IntVal("audit_fail_nodes").Observe(int64(numFailed)) //mon:locked
mon.IntVal("audit_offline_nodes").Observe(int64(numOffline)) //mon:locked
mon.IntVal("audit_contained_nodes").Observe(int64(numContained)) //mon:locked
mon.IntVal("audit_unknown_nodes").Observe(int64(numUnknown)) //mon:locked
mon.IntVal("audit_total_nodes").Observe(int64(totalAudited)) //mon:locked
mon.IntVal("audit_total_pointer_nodes").Observe(int64(totalInSegment)) //mon:locked
mon.FloatVal("audited_percentage").Observe(auditedPercentage) //mon:locked
mon.FloatVal("audit_offline_percentage").Observe(offlinePercentage) //mon:locked
mon.FloatVal("audit_successful_percentage").Observe(successfulPercentage) //mon:locked
mon.FloatVal("audit_failed_percentage").Observe(failedPercentage) //mon:locked
mon.FloatVal("audit_contained_percentage").Observe(containedPercentage) //mon:locked
mon.FloatVal("audit_unknown_percentage").Observe(unknownPercentage) //mon:locked
pendingAudits, err := createPendingAudits(ctx, containedNodes, correctedShares, segment, segmentInfo, randomIndex)
if err != nil {
return Report{
Successes: successNodes,
Fails: failedNodes,
Offlines: offlineNodes,
Unknown: unknownNodes,
}, err
}
return Report{
Successes: successNodes,
Fails: failedNodes,
Offlines: offlineNodes,
PendingAudits: pendingAudits,
Unknown: unknownNodes,
}, nil
}
// DownloadShares downloads shares from the nodes where remote pieces are located.
func (verifier *Verifier) DownloadShares(ctx context.Context, limits []*pb.AddressedOrderLimit, piecePrivateKey storj.PiecePrivateKey, cachedIPsAndPorts map[storj.NodeID]string, stripeIndex int32, shareSize int32) (shares map[int]Share, err error) {
defer mon.Task()(&ctx)(&err)
shares = make(map[int]Share, len(limits))
ch := make(chan *Share, len(limits))
for i, limit := range limits {
if limit == nil {
ch <- nil
continue
}
ip := cachedIPsAndPorts[limit.Limit.StorageNodeId]
go func(i int, limit *pb.AddressedOrderLimit) {
share, err := verifier.GetShare(ctx, limit, piecePrivateKey, ip, stripeIndex, shareSize, i)
if err != nil {
share = Share{
Error: err,
PieceNum: i,
NodeID: limit.GetLimit().StorageNodeId,
Data: nil,
}
}
ch <- &share
}(i, limit)
}
for range limits {
share := <-ch
if share != nil {
shares[share.PieceNum] = *share
}
}
return shares, nil
}
// Reverify reverifies the contained nodes in the stripe.
func (verifier *Verifier) Reverify(ctx context.Context, segment Segment) (report Report, err error) {
defer mon.Task()(&ctx)(&err)
// result status enum
const (
skipped = iota
success
offline
failed
contained
unknown
remove
erred
)
type result struct {
nodeID storj.NodeID
status int
pendingAudit *PendingAudit
err error
}
if segment.Expired(verifier.nowFn()) {
verifier.log.Debug("segment expired before Reverify")
return Report{}, nil
}
segmentInfo, err := verifier.metabase.GetSegmentByPosition(ctx, metabase.GetSegmentByPosition{
StreamID: segment.StreamID,
Position: segment.Position,
})
if err != nil {
if metabase.ErrSegmentNotFound.Has(err) {
verifier.log.Debug("segment deleted before Reverify")
return Report{}, nil
}
return Report{}, err
}
pieces := segmentInfo.Pieces
ch := make(chan result, len(pieces))
var containedInSegment int64
for _, piece := range pieces {
pending, err := verifier.containment.Get(ctx, piece.StorageNode)
if err != nil {
if ErrContainedNotFound.Has(err) {
ch <- result{nodeID: piece.StorageNode, status: skipped}
continue
}
ch <- result{nodeID: piece.StorageNode, status: erred, err: err}
verifier.log.Debug("Reverify: error getting from containment db", zap.Stringer("Node ID", piece.StorageNode), zap.Error(err))
continue
}
containedInSegment++
go func(pending *PendingAudit) {
// TODO: Get the exact version of the object. But where to take the version from the pending audit?
pendingObject, err := verifier.metabase.GetObjectLatestVersion(ctx, metabase.GetObjectLatestVersion{
ObjectLocation: pending.Segment.Object(),
})
if err != nil {
if storj.ErrObjectNotFound.Has(err) {
ch <- result{nodeID: pending.NodeID, status: remove}
return
}
ch <- result{nodeID: pending.NodeID, status: erred, err: err}
verifier.log.Debug("Reverify: error getting pending segment's object from metabase", zap.Stringer("Node ID", pending.NodeID), zap.Error(err))
return
}
if pendingObject.ExpiresAt != nil && !pendingObject.ExpiresAt.IsZero() && pendingObject.ExpiresAt.Before(verifier.nowFn()) {
verifier.log.Debug("Reverify: segment already expired", zap.Stringer("Node ID", pending.NodeID))
ch <- result{nodeID: pending.NodeID, status: remove}
return
}
pendingSegmentInfo, err := verifier.metabase.GetSegmentByPosition(ctx, metabase.GetSegmentByPosition{
StreamID: pendingObject.StreamID,
Position: pending.Segment.Position,
})
if err != nil {
if metabase.ErrSegmentNotFound.Has(err) {
ch <- result{nodeID: pending.NodeID, status: skipped}
return
}
ch <- result{nodeID: pending.NodeID, status: erred, err: err}
verifier.log.Debug("Reverify: error getting pending segment from metabase", zap.Stringer("Node ID", pending.NodeID), zap.Error(err))
return
}
// TODO: is this check still necessary? If the segment was found by its StreamID and position, the RootPieceID should not had changed.
if pendingSegmentInfo.RootPieceID != pending.PieceID {
ch <- result{nodeID: pending.NodeID, status: remove}
return
}
var pieceNum uint16
found := false
for _, piece := range pendingSegmentInfo.Pieces {
if piece.StorageNode == pending.NodeID {
pieceNum = piece.Number
found = true
}
}
if !found {
ch <- result{nodeID: pending.NodeID, status: remove}
return
}
limit, piecePrivateKey, cachedIPAndPort, err := verifier.orders.CreateAuditOrderLimit(ctx, pending.Segment.Bucket(), pending.NodeID, pieceNum, pending.PieceID, pending.ShareSize)
if err != nil {
if overlay.ErrNodeDisqualified.Has(err) {
_, errDelete := verifier.containment.Delete(ctx, pending.NodeID)
if errDelete != nil {
verifier.log.Debug("Error deleting disqualified node from containment db", zap.Stringer("Node ID", pending.NodeID), zap.Error(errDelete))
}
ch <- result{nodeID: pending.NodeID, status: erred, err: err}
verifier.log.Debug("Reverify: order limit not created (disqualified)", zap.Stringer("Node ID", pending.NodeID))
return
}
if overlay.ErrNodeFinishedGE.Has(err) {
_, errDelete := verifier.containment.Delete(ctx, pending.NodeID)
if errDelete != nil {
verifier.log.Debug("Error deleting gracefully exited node from containment db", zap.Stringer("Node ID", pending.NodeID), zap.Error(errDelete))
}
ch <- result{nodeID: pending.NodeID, status: erred, err: err}
verifier.log.Debug("Reverify: order limit not created (completed graceful exit)", zap.Stringer("Node ID", pending.NodeID))
return
}
if overlay.ErrNodeOffline.Has(err) {
ch <- result{nodeID: pending.NodeID, status: offline}
verifier.log.Debug("Reverify: order limit not created (offline)", zap.Stringer("Node ID", pending.NodeID))
return
}
ch <- result{nodeID: pending.NodeID, status: erred, err: err}
verifier.log.Debug("Reverify: error creating order limit", zap.Stringer("Node ID", pending.NodeID), zap.Error(err))
return
}
share, err := verifier.GetShare(ctx, limit, piecePrivateKey, cachedIPAndPort, pending.StripeIndex, pending.ShareSize, int(pieceNum))
// check if the pending audit was deleted while downloading the share
_, getErr := verifier.containment.Get(ctx, pending.NodeID)
if getErr != nil {
if ErrContainedNotFound.Has(getErr) {
ch <- result{nodeID: pending.NodeID, status: skipped}
verifier.log.Debug("Reverify: pending audit deleted during reverification", zap.Stringer("Node ID", pending.NodeID), zap.Error(getErr))
return
}
ch <- result{nodeID: pending.NodeID, status: erred, err: getErr}
verifier.log.Debug("Reverify: error getting from containment db", zap.Stringer("Node ID", pending.NodeID), zap.Error(getErr))
return
}
// analyze the error from GetShare
if err != nil {
if rpc.Error.Has(err) {
if errs.Is(err, context.DeadlineExceeded) {
// dial timeout
ch <- result{nodeID: pending.NodeID, status: offline}
verifier.log.Debug("Reverify: dial timeout (offline)", zap.Stringer("Node ID", pending.NodeID), zap.Error(err))
return
}
if errs2.IsRPC(err, rpcstatus.Unknown) {
// dial failed -- offline node
verifier.log.Debug("Reverify: dial failed (offline)", zap.Stringer("Node ID", pending.NodeID), zap.Error(err))
ch <- result{nodeID: pending.NodeID, status: offline}
return
}
// unknown transport error
ch <- result{nodeID: pending.NodeID, status: unknown, pendingAudit: pending}
verifier.log.Info("Reverify: unknown transport error (skipped)", zap.Stringer("Node ID", pending.NodeID), zap.Error(err))
return
}
if errs2.IsRPC(err, rpcstatus.NotFound) {
// Get the original segment
err := verifier.checkIfSegmentAltered(ctx, pending.Segment, pendingSegmentInfo)
if err != nil {
ch <- result{nodeID: pending.NodeID, status: remove}
verifier.log.Debug("Reverify: audit source changed before reverification", zap.Stringer("Node ID", pending.NodeID), zap.Error(err))
return
}
// missing share
ch <- result{nodeID: pending.NodeID, status: failed}
verifier.log.Info("Reverify: piece not found (audit failed)", zap.Stringer("Node ID", pending.NodeID), zap.Error(err))
return
}
if errs2.IsRPC(err, rpcstatus.DeadlineExceeded) {
// dial successful, but download timed out
ch <- result{nodeID: pending.NodeID, status: contained, pendingAudit: pending}
verifier.log.Info("Reverify: download timeout (contained)", zap.Stringer("Node ID", pending.NodeID), zap.Error(err))
return
}
// unknown error
ch <- result{nodeID: pending.NodeID, status: unknown, pendingAudit: pending}
verifier.log.Info("Reverify: unknown error (skipped)", zap.Stringer("Node ID", pending.NodeID), zap.Error(err))
return
}
downloadedHash := pkcrypto.SHA256Hash(share.Data)
if bytes.Equal(downloadedHash, pending.ExpectedShareHash) {
ch <- result{nodeID: pending.NodeID, status: success}
verifier.log.Info("Reverify: hashes match (audit success)", zap.Stringer("Node ID", pending.NodeID))
} else {
err := verifier.checkIfSegmentAltered(ctx, pending.Segment, pendingSegmentInfo)
if err != nil {
ch <- result{nodeID: pending.NodeID, status: remove}
verifier.log.Debug("Reverify: audit source changed before reverification", zap.Stringer("Node ID", pending.NodeID), zap.Error(err))
return
}
verifier.log.Info("Reverify: hashes mismatch (audit failed)", zap.Stringer("Node ID", pending.NodeID),
zap.Binary("expected hash", pending.ExpectedShareHash), zap.Binary("downloaded hash", downloadedHash))
ch <- result{nodeID: pending.NodeID, status: failed}
}
}(pending)
}
for range pieces {
result := <-ch
switch result.status {
case skipped:
case success:
report.Successes = append(report.Successes, result.nodeID)
case offline:
report.Offlines = append(report.Offlines, result.nodeID)
case failed:
report.Fails = append(report.Fails, result.nodeID)
case contained:
report.PendingAudits = append(report.PendingAudits, result.pendingAudit)
case unknown:
report.Unknown = append(report.Unknown, result.nodeID)
case remove:
_, errDelete := verifier.containment.Delete(ctx, result.nodeID)
if errDelete != nil {
verifier.log.Debug("Error deleting node from containment db", zap.Stringer("Node ID", result.nodeID), zap.Error(errDelete))
}
case erred:
err = errs.Combine(err, result.err)
default:
}
}
mon.Meter("reverify_successes_global").Mark(len(report.Successes)) //mon:locked
mon.Meter("reverify_offlines_global").Mark(len(report.Offlines)) //mon:locked
mon.Meter("reverify_fails_global").Mark(len(report.Fails)) //mon:locked
mon.Meter("reverify_contained_global").Mark(len(report.PendingAudits)) //mon:locked
mon.Meter("reverify_unknown_global").Mark(len(report.Unknown)) //mon:locked
mon.IntVal("reverify_successes").Observe(int64(len(report.Successes))) //mon:locked
mon.IntVal("reverify_offlines").Observe(int64(len(report.Offlines))) //mon:locked
mon.IntVal("reverify_fails").Observe(int64(len(report.Fails))) //mon:locked
mon.IntVal("reverify_contained").Observe(int64(len(report.PendingAudits))) //mon:locked
mon.IntVal("reverify_unknown").Observe(int64(len(report.Unknown))) //mon:locked
mon.IntVal("reverify_contained_in_segment").Observe(containedInSegment) //mon:locked
mon.IntVal("reverify_total_in_segment").Observe(int64(len(pieces))) //mon:locked
return report, err
}
// GetShare use piece store client to download shares from nodes.
func (verifier *Verifier) GetShare(ctx context.Context, limit *pb.AddressedOrderLimit, piecePrivateKey storj.PiecePrivateKey, cachedIPAndPort string, stripeIndex, shareSize int32, pieceNum int) (share Share, err error) {
defer mon.Task()(&ctx)(&err)
bandwidthMsgSize := shareSize
// determines number of seconds allotted for receiving data from a storage node
timedCtx := ctx
if verifier.minBytesPerSecond > 0 {
maxTransferTime := time.Duration(int64(time.Second) * int64(bandwidthMsgSize) / verifier.minBytesPerSecond.Int64())
if maxTransferTime < verifier.minDownloadTimeout {
maxTransferTime = verifier.minDownloadTimeout
}
var cancel func()
timedCtx, cancel = context.WithTimeout(ctx, maxTransferTime)
defer cancel()
}
targetNodeID := limit.GetLimit().StorageNodeId
log := verifier.log.Named(targetNodeID.String())
var ps *piecestore.Client
// if cached IP is given, try connecting there first
if cachedIPAndPort != "" {
nodeAddr := storj.NodeURL{
ID: targetNodeID,
Address: cachedIPAndPort,
}
ps, err = piecestore.DialNodeURL(timedCtx, verifier.dialer, nodeAddr, log, piecestore.DefaultConfig)
if err != nil {
log.Debug("failed to connect to audit target node at cached IP", zap.String("cached-ip-and-port", cachedIPAndPort), zap.Error(err))
}
}
// if no cached IP was given, or connecting to cached IP failed, use node address
if ps == nil {
nodeAddr := storj.NodeURL{
ID: targetNodeID,
Address: limit.GetStorageNodeAddress().Address,
}
ps, err = piecestore.DialNodeURL(timedCtx, verifier.dialer, nodeAddr, log, piecestore.DefaultConfig)
if err != nil {
return Share{}, Error.Wrap(err)
}
}
defer func() {
err := ps.Close()
if err != nil {
verifier.log.Error("audit verifier failed to close conn to node: %+v", zap.Error(err))
}
}()
offset := int64(shareSize) * int64(stripeIndex)
downloader, err := ps.Download(timedCtx, limit.GetLimit(), piecePrivateKey, offset, int64(shareSize))
if err != nil {
return Share{}, err
}
defer func() { err = errs.Combine(err, downloader.Close()) }()
buf := make([]byte, shareSize)
_, err = io.ReadFull(downloader, buf)
if err != nil {
return Share{}, err
}
return Share{
Error: nil,
PieceNum: pieceNum,
NodeID: targetNodeID,
Data: buf,
}, nil
}
// checkIfSegmentAltered checks if oldSegment has been altered since it was selected for audit.
func (verifier *Verifier) checkIfSegmentAltered(ctx context.Context, location metabase.SegmentLocation, oldSegment metabase.Segment) (err error) {
defer mon.Task()(&ctx)(&err)
if verifier.OnTestingCheckSegmentAlteredHook != nil {
verifier.OnTestingCheckSegmentAlteredHook()
}
newSegment, err := verifier.metabase.GetSegmentByPosition(ctx, metabase.GetSegmentByPosition{
StreamID: oldSegment.StreamID,
Position: oldSegment.Position,
})
if err != nil {
if metabase.ErrSegmentNotFound.Has(err) {
return ErrSegmentDeleted.New("%q", location.Encode())
}
return err
}
if !oldSegment.Pieces.Equal(newSegment.Pieces) {
return ErrSegmentModified.New("%q", location.Encode())
}
return nil
}
// SetNow allows tests to have the server act as if the current time is whatever they want.
func (verifier *Verifier) SetNow(nowFn func() time.Time) {
verifier.nowFn = nowFn
}
// auditShares takes the downloaded shares and uses infectious's Correct function to check that they
// haven't been altered. auditShares returns a slice containing the piece numbers of altered shares,
// and a slice of the corrected shares.
func auditShares(ctx context.Context, required, total int16, originals map[int]Share) (pieceNums []int, corrected []infectious.Share, err error) {
defer mon.Task()(&ctx)(&err)
f, err := infectious.NewFEC(int(required), int(total))
if err != nil {
return nil, nil, err
}
copies, err := makeCopies(ctx, originals)
if err != nil {
return nil, nil, err
}
err = f.Correct(copies)
if err != nil {
return nil, nil, err
}
for _, share := range copies {
if !bytes.Equal(originals[share.Number].Data, share.Data) {
pieceNums = append(pieceNums, share.Number)
}
}
return pieceNums, copies, nil
}
// makeCopies takes in a map of audit Shares and deep copies their data to a slice of infectious Shares.
func makeCopies(ctx context.Context, originals map[int]Share) (copies []infectious.Share, err error) {
defer mon.Task()(&ctx)(&err)
copies = make([]infectious.Share, 0, len(originals))
for _, original := range originals {
copies = append(copies, infectious.Share{
Data: append([]byte{}, original.Data...),
Number: original.PieceNum})
}
return copies, nil
}
// getOfflines nodes returns these storage nodes from the segment which have no
// order limit nor are skipped.
func getOfflineNodes(segment metabase.Segment, limits []*pb.AddressedOrderLimit, skip map[storj.NodeID]bool) storj.NodeIDList {
var offlines storj.NodeIDList
nodesWithLimit := make(map[storj.NodeID]bool, len(limits))
for _, limit := range limits {
if limit != nil {
nodesWithLimit[limit.GetLimit().StorageNodeId] = true
}
}
for _, piece := range segment.Pieces {
if !nodesWithLimit[piece.StorageNode] && !skip[piece.StorageNode] {
offlines = append(offlines, piece.StorageNode)
}
}
return offlines
}
// getSuccessNodes uses the failed nodes, offline nodes and contained nodes arrays to determine which nodes passed the audit.
func getSuccessNodes(ctx context.Context, shares map[int]Share, failedNodes, offlineNodes, unknownNodes storj.NodeIDList, containedNodes map[int]storj.NodeID) (successNodes storj.NodeIDList) {
defer mon.Task()(&ctx)(nil)
fails := make(map[storj.NodeID]bool)
for _, fail := range failedNodes {
fails[fail] = true
}
for _, offline := range offlineNodes {
fails[offline] = true
}
for _, unknown := range unknownNodes {
fails[unknown] = true
}
for _, contained := range containedNodes {
fails[contained] = true
}
for _, share := range shares {
if !fails[share.NodeID] {
successNodes = append(successNodes, share.NodeID)
}
}
return successNodes
}
func createPendingAudits(ctx context.Context, containedNodes map[int]storj.NodeID, correctedShares []infectious.Share, segment Segment, segmentInfo metabase.Segment, randomIndex int32) (pending []*PendingAudit, err error) {
defer mon.Task()(&ctx)(&err)
if len(containedNodes) == 0 {
return nil, nil
}
required := int(segmentInfo.Redundancy.RequiredShares)
total := int(segmentInfo.Redundancy.TotalShares)
shareSize := segmentInfo.Redundancy.ShareSize
fec, err := infectious.NewFEC(required, total)
if err != nil {
return nil, Error.Wrap(err)
}
stripeData, err := rebuildStripe(ctx, fec, correctedShares, int(shareSize))
if err != nil {
return nil, Error.Wrap(err)
}
for pieceNum, nodeID := range containedNodes {
share := make([]byte, shareSize)
err = fec.EncodeSingle(stripeData, share, pieceNum)
if err != nil {
return nil, Error.Wrap(err)
}
pending = append(pending, &PendingAudit{
NodeID: nodeID,
PieceID: segmentInfo.RootPieceID,
StripeIndex: randomIndex,
ShareSize: shareSize,
ExpectedShareHash: pkcrypto.SHA256Hash(share),
Segment: segment.SegmentLocation,
})
}
return pending, nil
}
func rebuildStripe(ctx context.Context, fec *infectious.FEC, corrected []infectious.Share, shareSize int) (_ []byte, err error) {
defer mon.Task()(&ctx)(&err)
stripe := make([]byte, fec.Required()*shareSize)
err = fec.Rebuild(corrected, func(share infectious.Share) {
copy(stripe[share.Number*shareSize:], share.Data)
})
if err != nil {
return nil, err
}
return stripe, nil
}
// GetRandomStripe takes a segment and returns a random stripe index within that segment.
func GetRandomStripe(ctx context.Context, segment metabase.Segment) (index int32, err error) {
defer mon.Task()(&ctx)(&err)
// the last segment could be smaller than stripe size
if segment.EncryptedSize < segment.Redundancy.StripeSize() {
return 0, nil
}
var src cryptoSource
rnd := rand.New(src)
numStripes := segment.EncryptedSize / segment.Redundancy.StripeSize()
randomStripeIndex := rnd.Int31n(numStripes)
return randomStripeIndex, nil
}