// Copyright (C) 2019 Storj Labs, Inc.
// See LICENSE for copying information.

package audit_test

import (
	"context"
	"testing"
	"time"

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
	"github.com/zeebo/errs"
	"go.uber.org/zap"

	"storj.io/common/errs2"
	"storj.io/common/memory"
	"storj.io/common/peertls/tlsopts"
	"storj.io/common/rpc"
	"storj.io/common/rpc/rpcstatus"
	"storj.io/common/storj"
	"storj.io/common/testcontext"
	"storj.io/common/testrand"
	"storj.io/storj/private/testblobs"
	"storj.io/storj/private/testplanet"
	"storj.io/storj/satellite"
	"storj.io/storj/satellite/audit"
	"storj.io/storj/satellite/metabase"
	"storj.io/storj/storagenode"
)

// TestDownloadSharesHappyPath checks that the Share.Error field of all shares
// returned by the DownloadShares method contain no error if all shares were
// downloaded successfully.
func TestDownloadSharesHappyPath(t *testing.T) {
	testplanet.Run(t, testplanet.Config{
		SatelliteCount: 1, StorageNodeCount: 4, UplinkCount: 1,
	}, func(t *testing.T, ctx *testcontext.Context, planet *testplanet.Planet) {
		satellite := planet.Satellites[0]
		audits := satellite.Audit

		audits.Worker.Loop.Pause()
		audits.Chore.Loop.Pause()

		uplink := planet.Uplinks[0]
		testData := testrand.Bytes(8 * memory.KiB)

		err := uplink.Upload(ctx, satellite, "testbucket", "test/path", testData)
		require.NoError(t, err)

		audits.Chore.Loop.TriggerWait()
		queue := audits.Queues.Fetch()
		queueSegment, err := queue.Next()
		require.NoError(t, err)

		segment, err := satellite.Metabase.DB.GetSegmentByPosition(ctx, metabase.GetSegmentByPosition{
			StreamID: queueSegment.StreamID,
			Position: queueSegment.Position,
		})
		require.NoError(t, err)

		randomIndex, err := audit.GetRandomStripe(ctx, segment)
		require.NoError(t, err)

		shareSize := segment.Redundancy.ShareSize

		limits, privateKey, cachedIPsAndPorts, err := satellite.Orders.Service.CreateAuditOrderLimits(ctx, segment, nil)
		require.NoError(t, err)

		shares, err := audits.Verifier.DownloadShares(ctx, limits, privateKey, cachedIPsAndPorts, randomIndex, shareSize)
		require.NoError(t, err)

		for _, share := range shares {
			assert.NoError(t, share.Error)
		}
	})
}

// TestDownloadSharesOfflineNode checks that the Share.Error field of the
// shares returned by the DownloadShares method for offline nodes contain an
// error that:
//   - has the rpc.Error class
//   - is not a context.DeadlineExceeded error
//   - is not an RPC error
//
// If this test fails, this most probably means we made a backward-incompatible
// change that affects the audit service.
func TestDownloadSharesOfflineNode(t *testing.T) {
	testplanet.Run(t, testplanet.Config{
		SatelliteCount: 1, StorageNodeCount: 4, UplinkCount: 1,
	}, func(t *testing.T, ctx *testcontext.Context, planet *testplanet.Planet) {
		satellite := planet.Satellites[0]
		audits := satellite.Audit

		audits.Worker.Loop.Pause()
		audits.Chore.Loop.Pause()

		uplink := planet.Uplinks[0]
		testData := testrand.Bytes(8 * memory.KiB)

		err := uplink.Upload(ctx, satellite, "testbucket", "test/path", testData)
		require.NoError(t, err)

		audits.Chore.Loop.TriggerWait()
		queue := audits.Queues.Fetch()
		queueSegment, err := queue.Next()
		require.NoError(t, err)

		segment, err := satellite.Metabase.DB.GetSegmentByPosition(ctx, metabase.GetSegmentByPosition{
			StreamID: queueSegment.StreamID,
			Position: queueSegment.Position,
		})
		require.NoError(t, err)

		randomIndex, err := audit.GetRandomStripe(ctx, segment)
		require.NoError(t, err)

		shareSize := segment.Redundancy.ShareSize

		limits, privateKey, cachedIPsAndPorts, err := satellite.Orders.Service.CreateAuditOrderLimits(ctx, segment, nil)
		require.NoError(t, err)

		// stop the first node in the segment
		stoppedNodeID := segment.Pieces[0].StorageNode
		err = planet.StopNodeAndUpdate(ctx, planet.FindNode(stoppedNodeID))
		require.NoError(t, err)

		shares, err := audits.Verifier.DownloadShares(ctx, limits, privateKey, cachedIPsAndPorts, randomIndex, shareSize)
		require.NoError(t, err)

		for _, share := range shares {
			if share.NodeID == stoppedNodeID {
				assert.True(t, rpc.Error.Has(share.Error), "unexpected error: %+v", share.Error)
				assert.False(t, errs.Is(share.Error, context.DeadlineExceeded), "unexpected error: %+v", share.Error)
				assert.True(t, errs2.IsRPC(share.Error, rpcstatus.Unknown), "unexpected error: %+v", share.Error)
			} else {
				assert.NoError(t, share.Error)
			}
		}
	})
}

// TestDownloadSharesMissingPiece checks that the Share.Error field of the
// shares returned by the DownloadShares method for nodes that don't have the
// audited piece contain an RPC error with code NotFound.
//
// If this test fails, this most probably means we made a backward-incompatible
// change that affects the audit service.
func TestDownloadSharesMissingPiece(t *testing.T) {
	testplanet.Run(t, testplanet.Config{
		SatelliteCount: 1, StorageNodeCount: 4, UplinkCount: 1,
	}, func(t *testing.T, ctx *testcontext.Context, planet *testplanet.Planet) {
		satellite := planet.Satellites[0]
		audits := satellite.Audit

		audits.Worker.Loop.Pause()
		audits.Chore.Loop.Pause()

		uplink := planet.Uplinks[0]
		testData := testrand.Bytes(8 * memory.KiB)

		err := uplink.Upload(ctx, satellite, "testbucket", "test/path", testData)
		require.NoError(t, err)

		audits.Chore.Loop.TriggerWait()
		queue := audits.Queues.Fetch()
		queueSegment, err := queue.Next()
		require.NoError(t, err)

		segment, err := satellite.Metabase.DB.GetSegmentByPosition(ctx, metabase.GetSegmentByPosition{
			StreamID: queueSegment.StreamID,
			Position: queueSegment.Position,
		})
		require.NoError(t, err)

		randomIndex, err := audit.GetRandomStripe(ctx, segment)
		require.NoError(t, err)

		// replace the piece id of the selected stripe with a new random one
		// to simulate missing piece on the storage nodes
		segment.RootPieceID = storj.NewPieceID()

		shareSize := segment.Redundancy.ShareSize

		limits, privateKey, cachedIPsAndPorts, err := satellite.Orders.Service.CreateAuditOrderLimits(ctx, segment, nil)
		require.NoError(t, err)

		shares, err := audits.Verifier.DownloadShares(ctx, limits, privateKey, cachedIPsAndPorts, randomIndex, shareSize)
		require.NoError(t, err)

		for _, share := range shares {
			assert.True(t, errs2.IsRPC(share.Error, rpcstatus.NotFound), "unexpected error: %+v", share.Error)
		}
	})
}

// TestDownloadSharesDialTimeout checks that the Share.Error field of the
// shares returned by the DownloadShares method for nodes that time out on
// dialing contain an error that:
//   - has the rpc.Error class
//   - is a context.DeadlineExceeded error
//   - is not an RPC error
//
// If this test fails, this most probably means we made a backward-incompatible
// change that affects the audit service.
func TestDownloadSharesDialTimeout(t *testing.T) {
	testplanet.Run(t, testplanet.Config{
		SatelliteCount: 1, StorageNodeCount: 4, UplinkCount: 1,
	}, func(t *testing.T, ctx *testcontext.Context, planet *testplanet.Planet) {
		satellite := planet.Satellites[0]
		audits := satellite.Audit

		audits.Worker.Loop.Pause()
		audits.Chore.Loop.Pause()

		upl := planet.Uplinks[0]
		testData := testrand.Bytes(8 * memory.KiB)

		err := upl.Upload(ctx, satellite, "testbucket", "test/path", testData)
		require.NoError(t, err)

		audits.Chore.Loop.TriggerWait()
		queue := audits.Queues.Fetch()
		queueSegment, err := queue.Next()
		require.NoError(t, err)

		segment, err := satellite.Metabase.DB.GetSegmentByPosition(ctx, metabase.GetSegmentByPosition{
			StreamID: queueSegment.StreamID,
			Position: queueSegment.Position,
		})
		require.NoError(t, err)

		randomIndex, err := audit.GetRandomStripe(ctx, segment)
		require.NoError(t, err)

		tlsOptions, err := tlsopts.NewOptions(satellite.Identity, tlsopts.Config{}, nil)
		require.NoError(t, err)

		dialer := rpc.NewDefaultDialer(tlsOptions)
		dialer.DialTimeout = 20 * time.Millisecond
		dialer.DialLatency = 200 * time.Second

		connector := rpc.NewDefaultTCPConnector(nil)
		connector.TransferRate = 1 * memory.KB
		dialer.Connector = connector

		// This config value will create a very short timeframe allowed for receiving
		// data from storage nodes. This will cause context to cancel with timeout.
		minBytesPerSecond := 100 * memory.KiB

		verifier := audit.NewVerifier(
			satellite.Log.Named("verifier"),
			satellite.Metabase.DB,
			dialer,
			satellite.Overlay.Service,
			satellite.DB.Containment(),
			satellite.Orders.Service,
			satellite.Identity,
			minBytesPerSecond,
			5*time.Second)

		shareSize := segment.Redundancy.ShareSize

		limits, privateKey, cachedIPsAndPorts, err := satellite.Orders.Service.CreateAuditOrderLimits(ctx, segment, nil)
		require.NoError(t, err)

		shares, err := verifier.DownloadShares(ctx, limits, privateKey, cachedIPsAndPorts, randomIndex, shareSize)
		require.NoError(t, err)

		for _, share := range shares {
			assert.True(t, rpc.Error.Has(share.Error), "unexpected error: %+v", share.Error)
			assert.True(t, errs.Is(share.Error, context.DeadlineExceeded), "unexpected error: %+v", share.Error)
		}
	})
}

// TestDownloadSharesDownloadTimeout checks that the Share.Error field of the
// shares returned by the DownloadShares method for nodes that are successfully
// dialed, but time out during the download of the share contain an error that:
//   - is an RPC error with code DeadlineExceeded
//   - does not have the rpc.Error class
//
// If this test fails, this most probably means we made a backward-incompatible
// change that affects the audit service.
func TestDownloadSharesDownloadTimeout(t *testing.T) {
	testplanet.Run(t, testplanet.Config{
		SatelliteCount: 1, StorageNodeCount: 1, UplinkCount: 1,
		Reconfigure: testplanet.Reconfigure{
			StorageNodeDB: func(index int, db storagenode.DB, log *zap.Logger) (storagenode.DB, error) {
				return testblobs.NewSlowDB(log.Named("slowdb"), db), nil
			},
		},
	}, func(t *testing.T, ctx *testcontext.Context, planet *testplanet.Planet) {
		storageNodeDB := planet.StorageNodes[0].DB.(*testblobs.SlowDB)

		satellite := planet.Satellites[0]
		audits := satellite.Audit

		audits.Worker.Loop.Pause()
		audits.Chore.Loop.Pause()

		upl := planet.Uplinks[0]
		testData := testrand.Bytes(8 * memory.KiB)

		err := upl.Upload(ctx, satellite, "testbucket", "test/path", testData)
		require.NoError(t, err)

		audits.Chore.Loop.TriggerWait()
		queue := audits.Queues.Fetch()
		queueSegment, err := queue.Next()
		require.NoError(t, err)

		segment, err := satellite.Metabase.DB.GetSegmentByPosition(ctx, metabase.GetSegmentByPosition{
			StreamID: queueSegment.StreamID,
			Position: queueSegment.Position,
		})
		require.NoError(t, err)

		randomIndex, err := audit.GetRandomStripe(ctx, segment)
		require.NoError(t, err)

		// This config value will create a very short timeframe allowed for receiving
		// data from storage nodes. This will cause context to cancel with timeout.
		minBytesPerSecond := 100 * memory.KiB

		verifier := audit.NewVerifier(
			satellite.Log.Named("verifier"),
			satellite.Metabase.DB,
			satellite.Dialer,
			satellite.Overlay.Service,
			satellite.DB.Containment(),
			satellite.Orders.Service,
			satellite.Identity,
			minBytesPerSecond,
			150*time.Millisecond)

		shareSize := segment.Redundancy.ShareSize

		limits, privateKey, cachedIPsAndPorts, err := satellite.Orders.Service.CreateAuditOrderLimits(ctx, segment, nil)
		require.NoError(t, err)

		// make downloads on storage node slower than the timeout on the satellite for downloading shares
		delay := 200 * time.Millisecond
		storageNodeDB.SetLatency(delay)

		shares, err := verifier.DownloadShares(ctx, limits, privateKey, cachedIPsAndPorts, randomIndex, shareSize)
		require.NoError(t, err)

		require.Len(t, shares, 1)
		share := shares[0]
		assert.True(t, errs2.IsRPC(share.Error, rpcstatus.DeadlineExceeded), "unexpected error: %+v", share.Error)
		assert.False(t, rpc.Error.Has(share.Error), "unexpected error: %+v", share.Error)
	})
}

func TestVerifierHappyPath(t *testing.T) {
	testplanet.Run(t, testplanet.Config{
		SatelliteCount: 1, StorageNodeCount: 4, UplinkCount: 1,
	}, func(t *testing.T, ctx *testcontext.Context, planet *testplanet.Planet) {
		satellite := planet.Satellites[0]
		audits := satellite.Audit

		audits.Worker.Loop.Pause()
		audits.Chore.Loop.Pause()

		ul := planet.Uplinks[0]
		testData := testrand.Bytes(8 * memory.KiB)

		err := ul.Upload(ctx, satellite, "testbucket", "test/path", testData)
		require.NoError(t, err)

		audits.Chore.Loop.TriggerWait()
		queue := audits.Queues.Fetch()
		queueSegment, err := queue.Next()
		require.NoError(t, err)

		segment, err := satellite.Metabase.DB.GetSegmentByPosition(ctx, metabase.GetSegmentByPosition{
			StreamID: queueSegment.StreamID,
			Position: queueSegment.Position,
		})
		require.NoError(t, err)

		report, err := audits.Verifier.Verify(ctx, queueSegment, nil)
		require.NoError(t, err)

		assert.Len(t, report.Successes, len(segment.Pieces))
		assert.Len(t, report.Fails, 0)
		assert.Len(t, report.Offlines, 0)
		assert.Len(t, report.PendingAudits, 0)
	})
}

func TestVerifierExpired(t *testing.T) {
	testplanet.Run(t, testplanet.Config{
		SatelliteCount: 1, StorageNodeCount: 4, UplinkCount: 1,
	}, func(t *testing.T, ctx *testcontext.Context, planet *testplanet.Planet) {
		satellite := planet.Satellites[0]
		audits := satellite.Audit

		audits.Worker.Loop.Pause()
		audits.Chore.Loop.Pause()

		ul := planet.Uplinks[0]
		testData := testrand.Bytes(8 * memory.KiB)

		err := ul.UploadWithExpiration(ctx, satellite, "testbucket", "test/path", testData, time.Now().Add(1*time.Hour))
		require.NoError(t, err)

		audits.Chore.Loop.TriggerWait()
		queue := audits.Queues.Fetch()
		queueSegment, err := queue.Next()
		require.NoError(t, err)

		// move time into the future so the segment is expired
		audits.Verifier.SetNow(func() time.Time {
			return time.Now().Add(2 * time.Hour)
		})

		// Verify should not return an error
		report, err := audits.Verifier.Verify(ctx, queueSegment, nil)
		require.NoError(t, err)

		assert.Len(t, report.Successes, 0)
		assert.Len(t, report.Fails, 0)
		assert.Len(t, report.Offlines, 0)
		assert.Len(t, report.PendingAudits, 0)
	})
}

func TestVerifierOfflineNode(t *testing.T) {
	testplanet.Run(t, testplanet.Config{
		SatelliteCount: 1, StorageNodeCount: 4, UplinkCount: 1,
	}, func(t *testing.T, ctx *testcontext.Context, planet *testplanet.Planet) {

		satellite := planet.Satellites[0]
		audits := satellite.Audit

		audits.Worker.Loop.Pause()
		audits.Chore.Loop.Pause()

		ul := planet.Uplinks[0]
		testData := testrand.Bytes(8 * memory.KiB)

		err := ul.Upload(ctx, satellite, "testbucket", "test/path", testData)
		require.NoError(t, err)

		audits.Chore.Loop.TriggerWait()
		queue := audits.Queues.Fetch()
		queueSegment, err := queue.Next()
		require.NoError(t, err)

		segment, err := satellite.Metabase.DB.GetSegmentByPosition(ctx, metabase.GetSegmentByPosition{
			StreamID: queueSegment.StreamID,
			Position: queueSegment.Position,
		})
		require.NoError(t, err)

		// stop the first node in the segment
		stoppedNodeID := segment.Pieces[0].StorageNode
		err = planet.StopNodeAndUpdate(ctx, planet.FindNode(stoppedNodeID))
		require.NoError(t, err)

		report, err := audits.Verifier.Verify(ctx, queueSegment, nil)
		require.NoError(t, err)

		assert.Len(t, report.Successes, len(segment.Pieces)-1)
		assert.Len(t, report.Fails, 0)
		assert.Len(t, report.Offlines, 1)
		assert.Len(t, report.PendingAudits, 0)
	})
}

func TestVerifierMissingPiece(t *testing.T) {
	testplanet.Run(t, testplanet.Config{
		SatelliteCount: 1, StorageNodeCount: 4, UplinkCount: 1,
	}, func(t *testing.T, ctx *testcontext.Context, planet *testplanet.Planet) {
		satellite := planet.Satellites[0]
		audits := satellite.Audit

		audits.Worker.Loop.Pause()
		audits.Chore.Loop.Pause()

		ul := planet.Uplinks[0]
		testData := testrand.Bytes(8 * memory.KiB)

		err := ul.Upload(ctx, satellite, "testbucket", "test/path", testData)
		require.NoError(t, err)

		audits.Chore.Loop.TriggerWait()
		queue := audits.Queues.Fetch()
		queueSegment, err := queue.Next()
		require.NoError(t, err)

		segment, err := satellite.Metabase.DB.GetSegmentByPosition(ctx, metabase.GetSegmentByPosition{
			StreamID: queueSegment.StreamID,
			Position: queueSegment.Position,
		})
		require.NoError(t, err)

		// delete the piece from the first node
		origNumPieces := len(segment.Pieces)
		piece := segment.Pieces[0]
		pieceID := segment.RootPieceID.Derive(piece.StorageNode, int32(piece.Number))
		node := planet.FindNode(piece.StorageNode)
		err = node.Storage2.Store.Delete(ctx, satellite.ID(), pieceID)
		require.NoError(t, err)

		report, err := audits.Verifier.Verify(ctx, queueSegment, nil)
		require.NoError(t, err)

		assert.Len(t, report.Successes, origNumPieces-1)
		assert.Len(t, report.Fails, 1)
		assert.Len(t, report.Offlines, 0)
		assert.Len(t, report.PendingAudits, 0)
	})
}

func TestVerifierNotEnoughPieces(t *testing.T) {
	testplanet.Run(t, testplanet.Config{
		SatelliteCount: 1, StorageNodeCount: 4, UplinkCount: 1,
		Reconfigure: testplanet.Reconfigure{
			StorageNodeDB: func(index int, db storagenode.DB, log *zap.Logger) (storagenode.DB, error) {
				return testblobs.NewBadDB(log.Named("baddb"), db), nil
			},
			Satellite: testplanet.ReconfigureRS(2, 2, 4, 4),
		},
	}, func(t *testing.T, ctx *testcontext.Context, planet *testplanet.Planet) {
		satellite := planet.Satellites[0]
		audits := satellite.Audit

		audits.Worker.Loop.Pause()
		audits.Chore.Loop.Pause()

		ul := planet.Uplinks[0]
		testData := testrand.Bytes(8 * memory.KiB)

		err := ul.Upload(ctx, satellite, "testbucket", "test/path", testData)
		require.NoError(t, err)

		audits.Chore.Loop.TriggerWait()
		queue := audits.Queues.Fetch()
		queueSegment, err := queue.Next()
		require.NoError(t, err)

		segment, err := satellite.Metabase.DB.GetSegmentByPosition(ctx, metabase.GetSegmentByPosition{
			StreamID: queueSegment.StreamID,
			Position: queueSegment.Position,
		})
		require.NoError(t, err)

		// out of 4 nodes, leave one intact
		// make one to be offline.
		// make one to return `unknown error` when respond to `GET_AUDIT/GET` request.
		// delete the piece from one node which would cause audit failure
		unknownErrorNode := planet.FindNode(segment.Pieces[0].StorageNode)
		offlineNode := planet.FindNode(segment.Pieces[1].StorageNode)
		deletedPieceNode := planet.FindNode(segment.Pieces[2].StorageNode)
		deletedPieceNum := int32(segment.Pieces[2].Number)

		// return an error when the verifier attempts to download from this node
		unknownErrorDB := unknownErrorNode.DB.(*testblobs.BadDB)
		unknownErrorDB.SetError(errs.New("unknown error"))

		// stop the offline node
		err = planet.StopNodeAndUpdate(ctx, offlineNode)
		require.NoError(t, err)

		// delete piece from deletedPieceNode
		pieceID := segment.RootPieceID.Derive(deletedPieceNode.ID(), deletedPieceNum)
		err = deletedPieceNode.Storage2.Store.Delete(ctx, satellite.ID(), pieceID)
		require.NoError(t, err)

		report, err := audits.Verifier.Verify(ctx, queueSegment, nil)
		require.True(t, audit.ErrNotEnoughShares.Has(err))

		// without enough pieces to complete the audit,
		// offlines and unknowns should be marked, but
		// failures should not
		assert.Len(t, report.Fails, 0)
		assert.Len(t, report.Offlines, 1)
		assert.Len(t, report.Unknown, 1)
	})
}

func TestVerifierDialTimeout(t *testing.T) {
	testplanet.Run(t, testplanet.Config{
		SatelliteCount: 1, StorageNodeCount: 4, UplinkCount: 1,
	}, func(t *testing.T, ctx *testcontext.Context, planet *testplanet.Planet) {
		satellite := planet.Satellites[0]
		audits := satellite.Audit

		audits.Worker.Loop.Pause()
		audits.Chore.Loop.Pause()

		ul := planet.Uplinks[0]
		testData := testrand.Bytes(8 * memory.KiB)

		err := ul.Upload(ctx, satellite, "testbucket", "test/path", testData)
		require.NoError(t, err)

		audits.Chore.Loop.TriggerWait()
		queue := audits.Queues.Fetch()
		queueSegment, err := queue.Next()
		require.NoError(t, err)

		segment, err := satellite.Metabase.DB.GetSegmentByPosition(ctx, metabase.GetSegmentByPosition{
			StreamID: queueSegment.StreamID,
			Position: queueSegment.Position,
		})
		require.NoError(t, err)

		tlsOptions, err := tlsopts.NewOptions(satellite.Identity, tlsopts.Config{}, nil)
		require.NoError(t, err)

		dialer := rpc.NewDefaultDialer(tlsOptions)
		dialer.DialTimeout = 20 * time.Millisecond
		dialer.DialLatency = 200 * time.Second

		connector := rpc.NewDefaultTCPConnector(nil)
		connector.TransferRate = 1 * memory.KB
		dialer.Connector = connector

		// This config value will create a very short timeframe allowed for receiving
		// data from storage nodes. This will cause context to cancel with timeout.
		minBytesPerSecond := 100 * memory.KiB

		verifier := audit.NewVerifier(
			satellite.Log.Named("verifier"),
			satellite.Metabase.DB,
			dialer,
			satellite.Overlay.Service,
			satellite.DB.Containment(),
			satellite.Orders.Service,
			satellite.Identity,
			minBytesPerSecond,
			5*time.Second)

		report, err := verifier.Verify(ctx, queueSegment, nil)
		require.True(t, audit.ErrNotEnoughShares.Has(err), "unexpected error: %+v", err)

		assert.Len(t, report.Successes, 0)
		assert.Len(t, report.Fails, 0)
		assert.Len(t, report.Offlines, len(segment.Pieces))
		assert.Len(t, report.PendingAudits, 0)
	})
}

func TestVerifierDeletedSegment(t *testing.T) {
	testplanet.Run(t, testplanet.Config{
		SatelliteCount: 1, StorageNodeCount: 4, UplinkCount: 1,
	}, func(t *testing.T, ctx *testcontext.Context, planet *testplanet.Planet) {
		satellite := planet.Satellites[0]
		audits := satellite.Audit

		audits.Worker.Loop.Pause()
		audits.Chore.Loop.Pause()

		ul := planet.Uplinks[0]
		testData := testrand.Bytes(8 * memory.KiB)

		err := ul.Upload(ctx, satellite, "testbucket", "test/path", testData)
		require.NoError(t, err)

		audits.Chore.Loop.TriggerWait()
		queue := audits.Queues.Fetch()
		segment, err := queue.Next()
		require.NoError(t, err)

		// delete the file
		err = ul.DeleteObject(ctx, satellite, "testbucket", "test/path")
		require.NoError(t, err)

		// Verify should not return an error, but report should be empty
		report, err := audits.Verifier.Verify(ctx, segment, nil)
		require.NoError(t, err)
		assert.Zero(t, report.Successes)
		assert.Zero(t, report.Fails)
		assert.Zero(t, report.Offlines)
		assert.Zero(t, report.PendingAudits)
		assert.Zero(t, report.Unknown)
	})
}

func TestVerifierModifiedSegment(t *testing.T) {
	testplanet.Run(t, testplanet.Config{
		SatelliteCount: 1, StorageNodeCount: 4, UplinkCount: 1,
	}, func(t *testing.T, ctx *testcontext.Context, planet *testplanet.Planet) {
		satellite := planet.Satellites[0]
		audits := satellite.Audit

		audits.Worker.Loop.Pause()
		audits.Chore.Loop.Pause()

		ul := planet.Uplinks[0]
		testData := testrand.Bytes(8 * memory.KiB)

		err := ul.Upload(ctx, satellite, "testbucket", "test/path", testData)
		require.NoError(t, err)

		audits.Chore.Loop.TriggerWait()
		queue := audits.Queues.Fetch()
		queueSegment, err := queue.Next()
		require.NoError(t, err)

		var segment metabase.Segment
		audits.Verifier.OnTestingCheckSegmentAlteredHook = func() {
			// remove one piece from the segment so that checkIfSegmentAltered fails
			segment, err = satellite.Metabase.DB.GetSegmentByPosition(ctx, metabase.GetSegmentByPosition{
				StreamID: queueSegment.StreamID,
				Position: queueSegment.Position,
			})
			require.NoError(t, err)

			err = satellite.Metabase.DB.UpdateSegmentPieces(ctx, metabase.UpdateSegmentPieces{
				StreamID:      queueSegment.StreamID,
				Position:      queueSegment.Position,
				OldPieces:     segment.Pieces,
				NewPieces:     append([]metabase.Piece{segment.Pieces[0]}, segment.Pieces[2:]...),
				NewRedundancy: segment.Redundancy,
			})
			require.NoError(t, err)
		}

		// Verify should not return an error, but report should be empty
		report, err := audits.Verifier.Verify(ctx, queueSegment, nil)
		require.NoError(t, err)
		assert.Zero(t, report.Successes)
		assert.Zero(t, report.Fails)
		assert.Zero(t, report.Offlines)
		assert.Zero(t, report.PendingAudits)
		assert.Zero(t, report.Unknown)
	})
}

func TestVerifierReplacedSegment(t *testing.T) {
	testplanet.Run(t, testplanet.Config{
		SatelliteCount: 1, StorageNodeCount: 4, UplinkCount: 1,
	}, func(t *testing.T, ctx *testcontext.Context, planet *testplanet.Planet) {
		satellite := planet.Satellites[0]
		audits := satellite.Audit

		audits.Worker.Loop.Pause()
		audits.Chore.Loop.Pause()

		ul := planet.Uplinks[0]
		testData := testrand.Bytes(8 * memory.KiB)

		err := ul.Upload(ctx, satellite, "testbucket", "test/path", testData)
		require.NoError(t, err)

		audits.Chore.Loop.TriggerWait()
		queue := audits.Queues.Fetch()
		segment, err := queue.Next()
		require.NoError(t, err)

		audits.Verifier.OnTestingCheckSegmentAlteredHook = func() {
			// replace the file so that checkIfSegmentAltered fails
			err := ul.Upload(ctx, satellite, "testbucket", "test/path", testData)
			require.NoError(t, err)
		}

		// Verify should not return an error, but report should be empty
		report, err := audits.Verifier.Verify(ctx, segment, nil)
		require.NoError(t, err)
		assert.Zero(t, report.Successes)
		assert.Zero(t, report.Fails)
		assert.Zero(t, report.Offlines)
		assert.Zero(t, report.PendingAudits)
		assert.Zero(t, report.Unknown)
	})
}

func TestVerifierModifiedSegmentFailsOnce(t *testing.T) {
	testplanet.Run(t, testplanet.Config{
		SatelliteCount: 1, StorageNodeCount: 4, UplinkCount: 1,
	}, func(t *testing.T, ctx *testcontext.Context, planet *testplanet.Planet) {
		satellite := planet.Satellites[0]
		audits := satellite.Audit

		audits.Worker.Loop.Pause()
		audits.Chore.Loop.Pause()

		ul := planet.Uplinks[0]
		testData := testrand.Bytes(8 * memory.KiB)

		err := ul.Upload(ctx, satellite, "testbucket", "test/path", testData)
		require.NoError(t, err)

		audits.Chore.Loop.TriggerWait()
		queue := audits.Queues.Fetch()
		queueSegment, err := queue.Next()
		require.NoError(t, err)

		segment, err := satellite.Metabase.DB.GetSegmentByPosition(ctx, metabase.GetSegmentByPosition{
			StreamID: queueSegment.StreamID,
			Position: queueSegment.Position,
		})
		require.NoError(t, err)

		// delete the piece from the first node
		origNumPieces := len(segment.Pieces)
		piece := segment.Pieces[0]
		pieceID := segment.RootPieceID.Derive(piece.StorageNode, int32(piece.Number))
		node := planet.FindNode(piece.StorageNode)
		err = node.Storage2.Store.Delete(ctx, satellite.ID(), pieceID)
		require.NoError(t, err)

		report, err := audits.Verifier.Verify(ctx, queueSegment, nil)
		require.NoError(t, err)

		assert.Len(t, report.Successes, origNumPieces-1)
		assert.Len(t, report.Fails, 1)
		assert.Equal(t, report.Fails[0], piece.StorageNode)
		assert.Len(t, report.Offlines, 0)
		require.Len(t, report.PendingAudits, 0)
	})
}

// TestVerifierSlowDownload checks that a node that times out while sending data to the
// audit service gets put into containment mode.
func TestVerifierSlowDownload(t *testing.T) {
	testplanet.Run(t, testplanet.Config{
		SatelliteCount: 1, StorageNodeCount: 4, UplinkCount: 1,
		Reconfigure: testplanet.Reconfigure{
			StorageNodeDB: func(index int, db storagenode.DB, log *zap.Logger) (storagenode.DB, error) {
				return testblobs.NewSlowDB(log.Named("slowdb"), db), nil
			},
			Satellite: testplanet.Combine(
				func(log *zap.Logger, index int, config *satellite.Config) {
					// These config values are chosen to force the slow node to time out without timing out on the three normal nodes
					config.Audit.MinBytesPerSecond = 100 * memory.KiB
					config.Audit.MinDownloadTimeout = 950 * time.Millisecond
				},
				testplanet.ReconfigureRS(2, 2, 4, 4),
			),
		},
	}, func(t *testing.T, ctx *testcontext.Context, planet *testplanet.Planet) {
		satellite := planet.Satellites[0]
		audits := satellite.Audit

		audits.Worker.Loop.Pause()
		audits.Chore.Loop.Pause()

		ul := planet.Uplinks[0]
		testData := testrand.Bytes(8 * memory.KiB)

		err := ul.Upload(ctx, satellite, "testbucket", "test/path", testData)
		require.NoError(t, err)

		audits.Chore.Loop.TriggerWait()
		queue := audits.Queues.Fetch()
		queueSegment, err := queue.Next()
		require.NoError(t, err)

		segment, err := satellite.Metabase.DB.GetSegmentByPosition(ctx, metabase.GetSegmentByPosition{
			StreamID: queueSegment.StreamID,
			Position: queueSegment.Position,
		})
		require.NoError(t, err)

		slowNode := planet.FindNode(segment.Pieces[0].StorageNode)
		slowNodeDB := slowNode.DB.(*testblobs.SlowDB)
		// make downloads on storage node slower than the timeout on the satellite for downloading shares
		delay := 1 * time.Second
		slowNodeDB.SetLatency(delay)

		report, err := audits.Verifier.Verify(ctx, queueSegment, nil)
		require.NoError(t, err)

		assert.NotContains(t, report.Successes, slowNode.ID())
		assert.Len(t, report.Fails, 0)
		assert.Len(t, report.Offlines, 0)
		assert.Len(t, report.Unknown, 0)
		assert.Len(t, report.PendingAudits, 1)
		assert.Equal(t, report.PendingAudits[0].NodeID, slowNode.ID())
	})
}

// TestVerifierUnknownError checks that a node that returns an unknown error in response to an audit request
// does not get marked as successful, failed, or contained.
func TestVerifierUnknownError(t *testing.T) {
	testplanet.Run(t, testplanet.Config{
		SatelliteCount: 1, StorageNodeCount: 4, UplinkCount: 1,
		Reconfigure: testplanet.Reconfigure{
			StorageNodeDB: func(index int, db storagenode.DB, log *zap.Logger) (storagenode.DB, error) {
				return testblobs.NewBadDB(log.Named("baddb"), db), nil
			},
			Satellite: testplanet.ReconfigureRS(2, 2, 4, 4),
		},
	}, func(t *testing.T, ctx *testcontext.Context, planet *testplanet.Planet) {
		satellite := planet.Satellites[0]
		audits := satellite.Audit

		audits.Worker.Loop.Pause()
		audits.Chore.Loop.Pause()

		ul := planet.Uplinks[0]
		testData := testrand.Bytes(8 * memory.KiB)

		err := ul.Upload(ctx, satellite, "testbucket", "test/path", testData)
		require.NoError(t, err)

		audits.Chore.Loop.TriggerWait()
		queue := audits.Queues.Fetch()
		queueSegment, err := queue.Next()
		require.NoError(t, err)

		segment, err := satellite.Metabase.DB.GetSegmentByPosition(ctx, metabase.GetSegmentByPosition{
			StreamID: queueSegment.StreamID,
			Position: queueSegment.Position,
		})
		require.NoError(t, err)

		badNode := planet.FindNode(segment.Pieces[0].StorageNode)
		badNodeDB := badNode.DB.(*testblobs.BadDB)
		// return an error when the verifier attempts to download from this node
		badNodeDB.SetError(errs.New("unknown error"))

		report, err := audits.Verifier.Verify(ctx, queueSegment, nil)
		require.NoError(t, err)

		assert.Len(t, report.Successes, 3)
		assert.Len(t, report.Fails, 0)
		assert.Len(t, report.Offlines, 0)
		assert.Len(t, report.PendingAudits, 0)
		assert.Len(t, report.Unknown, 1)
		assert.Equal(t, report.Unknown[0], badNode.ID())
	})
}