355ea2133b
When pieces fail an audit (hard fail, meaning the node acknowledged it did not have the piece or the piece was corrupted), we will now remove those pieces from the segment. Previously, we did not do this, and some node operators were seeing the same missing piece audited over and over again and losing reputation every time. This change will include both verification and reverification audits. It will also apply to pieces found to be bad during repair, if repair-to-reputation reporting is enabled. Change-Id: I0ca7af7e3fecdc0aebbd34fee4be3a0eab53f4f7
536 lines
21 KiB
Go
536 lines
21 KiB
Go
// Copyright (C) 2020 Storj Labs, Inc.
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// See LICENSE for copying information.
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package reputation_test
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import (
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"context"
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"testing"
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"time"
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"github.com/stretchr/testify/require"
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"go.uber.org/zap"
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"storj.io/common/storj"
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"storj.io/common/testcontext"
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"storj.io/storj/private/testplanet"
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"storj.io/storj/satellite"
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"storj.io/storj/satellite/audit"
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"storj.io/storj/satellite/metabase"
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"storj.io/storj/satellite/overlay"
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"storj.io/storj/satellite/reputation"
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)
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// TestAuditSuspendBasic ensures that we can suspend a node using overlayService.SuspendNode and that we can unsuspend a node using overlayservice.UnsuspendNode.
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func TestAuditSuspendBasic(t *testing.T) {
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testplanet.Run(t, testplanet.Config{
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SatelliteCount: 1, StorageNodeCount: 1, UplinkCount: 0,
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}, func(t *testing.T, ctx *testcontext.Context, planet *testplanet.Planet) {
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nodeID := planet.StorageNodes[0].ID()
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repService := planet.Satellites[0].Reputation.Service
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oc := planet.Satellites[0].Overlay.DB
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node, err := oc.Get(ctx, nodeID)
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require.NoError(t, err)
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require.Nil(t, node.UnknownAuditSuspended)
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timeToSuspend := time.Now().UTC().Truncate(time.Second)
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err = repService.TestSuspendNodeUnknownAudit(ctx, nodeID, timeToSuspend)
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require.NoError(t, err)
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node, err = oc.Get(ctx, nodeID)
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require.NoError(t, err)
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require.NotNil(t, node.UnknownAuditSuspended)
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require.True(t, node.UnknownAuditSuspended.Equal(timeToSuspend))
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err = repService.TestUnsuspendNodeUnknownAudit(ctx, nodeID)
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require.NoError(t, err)
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node, err = oc.Get(ctx, nodeID)
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require.NoError(t, err)
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require.Nil(t, node.UnknownAuditSuspended)
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})
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}
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// TestAuditSuspendWithUpdateStats ensures that a node goes into suspension node from getting enough unknown audits, and gets removed from getting enough successful audits.
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func TestAuditSuspendWithUpdateStats(t *testing.T) {
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testplanet.Run(t, testplanet.Config{
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SatelliteCount: 1, StorageNodeCount: 1, UplinkCount: 0,
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Reconfigure: testplanet.Reconfigure{
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Satellite: func(log *zap.Logger, index int, config *satellite.Config) {
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config.Reputation.AuditWeight = 1
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config.Reputation.AuditDQ = 0.6
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},
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},
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}, func(t *testing.T, ctx *testcontext.Context, planet *testplanet.Planet) {
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nodeID := planet.StorageNodes[0].ID()
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satellite := planet.Satellites[0]
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oc := satellite.Overlay.Service
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repService := satellite.Reputation.Service
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node, err := oc.Get(ctx, nodeID)
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require.NoError(t, err)
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require.Nil(t, node.UnknownAuditSuspended)
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testStartTime := time.Now()
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// give node one unknown audit - bringing unknown audit rep to 0.5, and suspending node
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err = repService.ApplyAudit(ctx, nodeID, node.Reputation.Status, reputation.AuditUnknown)
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require.NoError(t, err)
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reputationInfo, err := repService.Get(ctx, nodeID)
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require.NoError(t, err)
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// expect unknown audit alpha/beta to change and suspended to be set
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require.True(t, reputationInfo.UnknownAuditReputationAlpha < 1)
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require.True(t, reputationInfo.UnknownAuditReputationBeta > 0)
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require.NotNil(t, reputationInfo.UnknownAuditSuspended)
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require.True(t, reputationInfo.UnknownAuditSuspended.After(testStartTime))
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// expect normal audit alpha/beta remain unchanged
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require.EqualValues(t, reputationInfo.AuditReputationAlpha, satellite.Config.Reputation.InitialAlpha)
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require.EqualValues(t, reputationInfo.AuditReputationBeta, satellite.Config.Reputation.InitialBeta)
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// expect node is not disqualified
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node, err = oc.Get(ctx, nodeID)
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require.NoError(t, err)
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require.Nil(t, node.Disqualified)
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// give node two successful audits - bringing unknown audit rep to 0.75, and unsuspending node
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for i := 0; i < 2; i++ {
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err = repService.ApplyAudit(ctx, nodeID, node.Reputation.Status, reputation.AuditSuccess)
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require.NoError(t, err)
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}
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node, err = oc.Get(ctx, nodeID)
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require.NoError(t, err)
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require.Nil(t, node.UnknownAuditSuspended)
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})
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}
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// TestAuditSuspendFailedAudit ensures that a node is not suspended for a failed audit.
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func TestAuditSuspendFailedAudit(t *testing.T) {
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testplanet.Run(t, testplanet.Config{
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SatelliteCount: 1, StorageNodeCount: 1, UplinkCount: 0,
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Reconfigure: testplanet.Reconfigure{
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Satellite: func(log *zap.Logger, index int, config *satellite.Config) {
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config.Reputation.InitialAlpha = 1.0
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config.Reputation.AuditLambda = 1.0
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},
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},
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}, func(t *testing.T, ctx *testcontext.Context, planet *testplanet.Planet) {
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nodeID := planet.StorageNodes[0].ID()
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oc := planet.Satellites[0].Overlay.DB
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repService := planet.Satellites[0].Reputation.Service
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node, err := oc.Get(ctx, nodeID)
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require.NoError(t, err)
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require.Nil(t, node.Disqualified)
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require.Nil(t, node.UnknownAuditSuspended)
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// give node one failed audit - bringing audit rep to 0.5, and disqualifying node
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// expect that suspended field and unknown audit reputation remain unchanged
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err = repService.ApplyAudit(ctx, nodeID, node.Reputation.Status, reputation.AuditFailure)
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require.NoError(t, err)
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node, err = oc.Get(ctx, nodeID)
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require.NoError(t, err)
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require.NotNil(t, node.Disqualified)
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require.Nil(t, node.UnknownAuditSuspended)
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reputationInfo, err := repService.Get(ctx, nodeID)
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require.NoError(t, err)
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require.EqualValues(t, reputationInfo.UnknownAuditReputationAlpha, 1)
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require.EqualValues(t, reputationInfo.UnknownAuditReputationBeta, 0)
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})
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}
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// TestAuditSuspendExceedGracePeriod ensures that a node is disqualified when it receives a failing or unknown audit after the grace period expires.
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func TestAuditSuspendExceedGracePeriod(t *testing.T) {
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testplanet.Run(t, testplanet.Config{
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SatelliteCount: 1, StorageNodeCount: 4, UplinkCount: 0,
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Reconfigure: testplanet.Reconfigure{
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Satellite: func(log *zap.Logger, index int, config *satellite.Config) {
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config.Reputation.SuspensionGracePeriod = time.Hour
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config.Reputation.InitialAlpha = 1
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config.Reputation.AuditLambda = 0.95
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config.Reputation.AuditDQ = 0.6
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// disable write cache so changes are immediate
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config.Reputation.FlushInterval = 0
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},
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},
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}, func(t *testing.T, ctx *testcontext.Context, planet *testplanet.Planet) {
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successNodeID := planet.StorageNodes[0].ID()
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failNodeID := planet.StorageNodes[1].ID()
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offlineNodeID := planet.StorageNodes[2].ID()
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unknownNodeID := planet.StorageNodes[3].ID()
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// suspend each node two hours ago (more than grace period)
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repService := planet.Satellites[0].Reputation.Service
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for _, node := range (storj.NodeIDList{successNodeID, failNodeID, offlineNodeID, unknownNodeID}) {
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err := repService.TestSuspendNodeUnknownAudit(ctx, node, time.Now().Add(-2*time.Hour))
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require.NoError(t, err)
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}
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nodesStatus := make(map[storj.NodeID]overlay.ReputationStatus)
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// no nodes should be disqualified
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for _, node := range (storj.NodeIDList{successNodeID, failNodeID, offlineNodeID, unknownNodeID}) {
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n, err := repService.Get(ctx, node)
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require.NoError(t, err)
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require.Nil(t, n.Disqualified)
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nodesStatus[node] = overlay.ReputationStatus{
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Disqualified: n.Disqualified,
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UnknownAuditSuspended: n.UnknownAuditSuspended,
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OfflineSuspended: n.OfflineSuspended,
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VettedAt: n.VettedAt,
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}
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}
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// give one node a successful audit, one a failed audit, one an offline audit, and one an unknown audit
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report := audit.Report{
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Successes: storj.NodeIDList{successNodeID},
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Fails: metabase.Pieces{{StorageNode: failNodeID}},
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Offlines: storj.NodeIDList{offlineNodeID},
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Unknown: storj.NodeIDList{unknownNodeID},
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NodesReputation: nodesStatus,
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}
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auditService := planet.Satellites[0].Audit
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auditService.Reporter.RecordAudits(ctx, report)
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// success and offline nodes should not be disqualified
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// fail and unknown nodes should be disqualified
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for _, node := range (storj.NodeIDList{successNodeID, offlineNodeID}) {
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n, err := repService.Get(ctx, node)
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require.NoError(t, err)
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require.Nil(t, n.Disqualified)
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}
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for _, node := range (storj.NodeIDList{failNodeID, unknownNodeID}) {
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n, err := repService.Get(ctx, node)
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require.NoError(t, err)
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require.NotNil(t, n.Disqualified)
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}
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})
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}
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// TestAuditSuspendDQDisabled ensures that a node is not disqualified from suspended mode if the suspension DQ enabled flag is false.
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func TestAuditSuspendDQDisabled(t *testing.T) {
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testplanet.Run(t, testplanet.Config{
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SatelliteCount: 1, StorageNodeCount: 4, UplinkCount: 0,
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Reconfigure: testplanet.Reconfigure{
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Satellite: func(log *zap.Logger, index int, config *satellite.Config) {
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config.Reputation.SuspensionGracePeriod = time.Hour
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config.Reputation.SuspensionDQEnabled = false
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config.Reputation.InitialAlpha = 1
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},
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},
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}, func(t *testing.T, ctx *testcontext.Context, planet *testplanet.Planet) {
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successNodeID := planet.StorageNodes[0].ID()
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failNodeID := planet.StorageNodes[1].ID()
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offlineNodeID := planet.StorageNodes[2].ID()
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unknownNodeID := planet.StorageNodes[3].ID()
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// suspend each node two hours ago (more than grace period)
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oc := planet.Satellites[0].DB.OverlayCache()
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repService := planet.Satellites[0].Reputation.Service
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for _, node := range (storj.NodeIDList{successNodeID, failNodeID, offlineNodeID, unknownNodeID}) {
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err := repService.TestSuspendNodeUnknownAudit(ctx, node, time.Now().Add(-2*time.Hour))
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require.NoError(t, err)
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}
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nodesStatus := make(map[storj.NodeID]overlay.ReputationStatus)
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// no nodes should be disqualified
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for _, node := range (storj.NodeIDList{successNodeID, failNodeID, offlineNodeID, unknownNodeID}) {
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n, err := oc.Get(ctx, node)
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require.NoError(t, err)
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require.Nil(t, n.Disqualified)
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nodesStatus[node] = overlay.ReputationStatus{
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Disqualified: n.Disqualified,
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UnknownAuditSuspended: n.UnknownAuditSuspended,
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OfflineSuspended: n.OfflineSuspended,
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VettedAt: n.Reputation.Status.VettedAt,
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}
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}
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// give one node a successful audit, one a failed audit, one an offline audit, and one an unknown audit
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report := audit.Report{
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Successes: storj.NodeIDList{successNodeID},
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Fails: metabase.Pieces{{StorageNode: failNodeID}},
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Offlines: storj.NodeIDList{offlineNodeID},
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Unknown: storj.NodeIDList{unknownNodeID},
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NodesReputation: nodesStatus,
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}
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auditService := planet.Satellites[0].Audit
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auditService.Reporter.RecordAudits(ctx, report)
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// successful node should not be suspended or disqualified
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n, err := oc.Get(ctx, successNodeID)
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require.NoError(t, err)
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require.Nil(t, n.UnknownAuditSuspended)
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require.Nil(t, n.Disqualified)
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// failed node should not be suspended but should be disqualified
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// (disqualified because of a failed audit, not because of exceeding suspension grace period)
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n, err = oc.Get(ctx, failNodeID)
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require.NoError(t, err)
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require.Nil(t, n.UnknownAuditSuspended)
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require.NotNil(t, n.Disqualified)
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// offline node should not be suspended or disqualified
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n, err = oc.Get(ctx, offlineNodeID)
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require.NoError(t, err)
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require.Nil(t, n.UnknownAuditSuspended)
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require.Nil(t, n.Disqualified)
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// unknown node should still be suspended but not disqualified
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n, err = oc.Get(ctx, unknownNodeID)
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require.NoError(t, err)
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require.NotNil(t, n.UnknownAuditSuspended)
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require.Nil(t, n.Disqualified)
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})
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}
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// TestOfflineAuditSuspensionDisabled ensures that a node is not suspended if the offline suspension enabled flag is false.
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func TestOfflineAuditSuspensionDisabled(t *testing.T) {
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testplanet.Run(t, testplanet.Config{
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SatelliteCount: 1, StorageNodeCount: 1, UplinkCount: 0,
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Reconfigure: testplanet.Reconfigure{
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Satellite: func(log *zap.Logger, index int, config *satellite.Config) {
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config.Reputation.AuditHistory.OfflineSuspensionEnabled = false
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config.Reputation.AuditHistory.WindowSize = time.Hour
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config.Reputation.AuditHistory.TrackingPeriod = 2 * time.Hour
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},
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},
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}, func(t *testing.T, ctx *testcontext.Context, planet *testplanet.Planet) {
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nodeID := planet.StorageNodes[0].ID()
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oc := planet.Satellites[0].Overlay.DB
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reputationdb := planet.Satellites[0].DB.Reputation()
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config := planet.Satellites[0].Config.Reputation.AuditHistory
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node, err := oc.Get(ctx, nodeID)
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require.NoError(t, err)
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require.Nil(t, node.OfflineSuspended)
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require.Nil(t, node.OfflineUnderReview)
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require.Nil(t, node.Disqualified)
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windowSize := config.WindowSize
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trackingPeriodLength := config.TrackingPeriod
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currentWindow := time.Now()
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req := reputation.UpdateRequest{
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NodeID: nodeID,
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AuditOutcome: reputation.AuditOffline,
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Config: reputation.Config{
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AuditHistory: config,
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},
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}
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// check that unsuspended node does not get suspended
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for i := 0; i <= int(trackingPeriodLength/windowSize); i++ {
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_, err = reputationdb.Update(ctx, req, currentWindow)
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require.NoError(t, err)
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currentWindow = currentWindow.Add(windowSize)
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}
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reputationInfo, err := reputationdb.Get(ctx, nodeID)
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require.NoError(t, err)
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require.Nil(t, reputationInfo.OfflineSuspended)
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require.Nil(t, reputationInfo.UnderReview)
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require.Less(t, reputationInfo.OnlineScore, config.OfflineThreshold)
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// check that enabling flag suspends the node
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req.AuditHistory.OfflineSuspensionEnabled = true
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_, err = reputationdb.Update(ctx, req, currentWindow)
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require.NoError(t, err)
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reputationInfo, err = reputationdb.Get(ctx, nodeID)
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require.NoError(t, err)
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require.NotNil(t, reputationInfo.OfflineSuspended)
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require.NotNil(t, reputationInfo.UnderReview)
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require.Less(t, reputationInfo.OnlineScore, config.OfflineThreshold)
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// check that disabling flag clears suspension and under review
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req.AuditHistory.OfflineSuspensionEnabled = false
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_, err = reputationdb.Update(ctx, req, currentWindow)
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require.NoError(t, err)
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reputationInfo, err = reputationdb.Get(ctx, nodeID)
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require.NoError(t, err)
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require.Less(t, reputationInfo.OnlineScore, config.OfflineThreshold)
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require.Nil(t, reputationInfo.OfflineSuspended)
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require.Nil(t, reputationInfo.UnderReview)
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})
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}
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// TestOfflineSuspend tests that a node enters offline suspension and "under review" when online score passes below threshold.
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// The node should be able to enter and exit suspension while remaining under review.
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// The node should be reinstated if it has a good online score after the review period.
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// The node should be disqualified if it has a bad online score after the review period.
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func TestOfflineSuspend(t *testing.T) {
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testplanet.Run(t, testplanet.Config{
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SatelliteCount: 1, StorageNodeCount: 1, UplinkCount: 0,
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Reconfigure: testplanet.Reconfigure{
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Satellite: func(log *zap.Logger, index int, config *satellite.Config) {
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config.Reputation.AuditHistory.OfflineSuspensionEnabled = false
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config.Reputation.AuditHistory.WindowSize = time.Hour
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config.Reputation.AuditHistory.TrackingPeriod = 2 * time.Hour
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},
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},
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}, func(t *testing.T, ctx *testcontext.Context, planet *testplanet.Planet) {
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nodeID := planet.StorageNodes[0].ID()
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reputationdb := planet.Satellites[0].DB.Reputation()
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oc := planet.Satellites[0].DB.OverlayCache()
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node, err := oc.Get(ctx, nodeID)
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require.NoError(t, err)
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require.Nil(t, node.OfflineSuspended)
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require.Nil(t, node.Disqualified)
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updateReq := reputation.UpdateRequest{
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NodeID: nodeID,
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AuditOutcome: reputation.AuditOffline,
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Config: reputation.Config{
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AuditHistory: reputation.AuditHistoryConfig{
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WindowSize: time.Hour,
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TrackingPeriod: 2 * time.Hour,
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GracePeriod: time.Hour,
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OfflineThreshold: 0.6,
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OfflineDQEnabled: true,
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OfflineSuspensionEnabled: true,
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},
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AuditLambda: 0.95,
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AuditWeight: 1,
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AuditDQ: 0.6,
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InitialAlpha: 1000,
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InitialBeta: 0,
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UnknownAuditDQ: 0.6,
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UnknownAuditLambda: 0.95,
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SuspensionGracePeriod: time.Hour,
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SuspensionDQEnabled: true,
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AuditCount: 0,
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},
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}
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// give node an offline audit
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// node's score is still 1 until its first window is complete
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nextWindowTime := time.Now()
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_, err = reputationdb.Update(ctx, updateReq, nextWindowTime)
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require.NoError(t, err)
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reputationInfo, err := reputationdb.Get(ctx, nodeID)
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require.NoError(t, err)
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require.Nil(t, reputationInfo.OfflineSuspended)
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require.Nil(t, reputationInfo.UnderReview)
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require.Nil(t, reputationInfo.Disqualified)
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require.EqualValues(t, 1, reputationInfo.OnlineScore)
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nextWindowTime = nextWindowTime.Add(updateReq.AuditHistory.WindowSize)
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// node now has one full window, so its score should be 0
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// should not be suspended or DQ since it only has 1 window out of 2 for tracking period
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_, err = reputationdb.Update(ctx, updateReq, nextWindowTime)
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require.NoError(t, err)
|
|
|
|
reputationInfo, err = reputationdb.Get(ctx, nodeID)
|
|
require.NoError(t, err)
|
|
require.Nil(t, reputationInfo.OfflineSuspended)
|
|
require.Nil(t, reputationInfo.UnderReview)
|
|
require.Nil(t, reputationInfo.Disqualified)
|
|
require.EqualValues(t, 0, reputationInfo.OnlineScore)
|
|
|
|
nextWindowTime = nextWindowTime.Add(updateReq.AuditHistory.WindowSize)
|
|
|
|
nextWindowTime, err = setOnlineScore(ctx, updateReq, 0.5, time.Hour, nextWindowTime, reputationdb)
|
|
require.NoError(t, err)
|
|
|
|
// node should be offline suspended and under review
|
|
reputationInfo, err = reputationdb.Get(ctx, nodeID)
|
|
require.NoError(t, err)
|
|
require.NotNil(t, reputationInfo.OfflineSuspended)
|
|
require.NotNil(t, reputationInfo.UnderReview)
|
|
require.Nil(t, node.Disqualified)
|
|
require.EqualValues(t, 0.5, reputationInfo.OnlineScore)
|
|
|
|
// set online score to be good, but use a long grace period so that node remains under review
|
|
nextWindowTime, err = setOnlineScore(ctx, updateReq, 1, 100*time.Hour, nextWindowTime, reputationdb)
|
|
require.NoError(t, err)
|
|
|
|
reputationInfo, err = reputationdb.Get(ctx, nodeID)
|
|
require.NoError(t, err)
|
|
require.Nil(t, reputationInfo.OfflineSuspended)
|
|
require.NotNil(t, reputationInfo.UnderReview)
|
|
require.Nil(t, reputationInfo.Disqualified)
|
|
oldUnderReview := reputationInfo.UnderReview
|
|
require.EqualValues(t, 1, reputationInfo.OnlineScore)
|
|
|
|
// suspend again, under review should be the same
|
|
nextWindowTime, err = setOnlineScore(ctx, updateReq, 0.5, 100*time.Hour, nextWindowTime, reputationdb)
|
|
require.NoError(t, err)
|
|
|
|
reputationInfo, err = reputationdb.Get(ctx, nodeID)
|
|
require.NoError(t, err)
|
|
require.NotNil(t, reputationInfo.OfflineSuspended)
|
|
require.NotNil(t, reputationInfo.UnderReview)
|
|
require.Nil(t, node.Disqualified)
|
|
require.Equal(t, oldUnderReview, reputationInfo.UnderReview)
|
|
require.EqualValues(t, 0.5, reputationInfo.OnlineScore)
|
|
|
|
// node will exit review after grace period + 1 tracking window, so set grace period to be time since put under review
|
|
// subtract one hour so that review window ends when setOnlineScore adds the last window
|
|
gracePeriod := nextWindowTime.Sub(*reputationInfo.UnderReview) - time.Hour
|
|
nextWindowTime, err = setOnlineScore(ctx, updateReq, 1, gracePeriod, nextWindowTime, reputationdb)
|
|
require.NoError(t, err)
|
|
|
|
reputationInfo, err = reputationdb.Get(ctx, nodeID)
|
|
require.NoError(t, err)
|
|
require.Nil(t, reputationInfo.OfflineSuspended)
|
|
require.Nil(t, reputationInfo.UnderReview)
|
|
require.Nil(t, reputationInfo.Disqualified)
|
|
require.EqualValues(t, 1, reputationInfo.OnlineScore)
|
|
|
|
// put into suspension and under review again
|
|
nextWindowTime, err = setOnlineScore(ctx, updateReq, 0.5, 100*time.Hour, nextWindowTime, reputationdb)
|
|
require.NoError(t, err)
|
|
|
|
reputationInfo, err = reputationdb.Get(ctx, nodeID)
|
|
require.NoError(t, err)
|
|
require.NotNil(t, reputationInfo.OfflineSuspended)
|
|
require.NotNil(t, reputationInfo.UnderReview)
|
|
require.Nil(t, node.Disqualified)
|
|
require.EqualValues(t, 0.5, reputationInfo.OnlineScore)
|
|
|
|
// if grace period + 1 tracking window passes and online score is still bad, expect node to be DQed
|
|
_, err = setOnlineScore(ctx, updateReq, 0.5, 0, nextWindowTime, reputationdb)
|
|
require.NoError(t, err)
|
|
|
|
reputationInfo, err = reputationdb.Get(ctx, nodeID)
|
|
require.NoError(t, err)
|
|
require.NotNil(t, reputationInfo.OfflineSuspended)
|
|
require.NotNil(t, reputationInfo.UnderReview)
|
|
require.NotNil(t, reputationInfo.Disqualified)
|
|
require.EqualValues(t, 0.5, reputationInfo.OnlineScore)
|
|
})
|
|
}
|
|
|
|
func setOnlineScore(ctx context.Context, reqPtr reputation.UpdateRequest, desiredScore float64, gracePeriod time.Duration, startTime time.Time, reputationdb reputation.DB) (nextWindowTime time.Time, err error) {
|
|
// for our tests, we are only using values of 1 and 0.5, so two audits per window is sufficient
|
|
totalAudits := 2
|
|
onlineAudits := int(float64(totalAudits) * desiredScore)
|
|
nextWindowTime = startTime
|
|
|
|
windowsPerTrackingPeriod := int(reqPtr.AuditHistory.TrackingPeriod.Seconds() / reqPtr.AuditHistory.WindowSize.Seconds())
|
|
for window := 0; window < windowsPerTrackingPeriod+1; window++ {
|
|
for i := 0; i < totalAudits; i++ {
|
|
updateReq := reqPtr
|
|
updateReq.AuditOutcome = reputation.AuditSuccess
|
|
if i >= onlineAudits {
|
|
updateReq.AuditOutcome = reputation.AuditOffline
|
|
}
|
|
updateReq.AuditHistory.GracePeriod = gracePeriod
|
|
|
|
_, err = reputationdb.Update(ctx, updateReq, nextWindowTime)
|
|
if err != nil {
|
|
return nextWindowTime, err
|
|
}
|
|
}
|
|
// increment nextWindowTime so in the next iteration, we are adding to a different window
|
|
nextWindowTime = nextWindowTime.Add(reqPtr.AuditHistory.WindowSize)
|
|
}
|
|
return nextWindowTime, err
|
|
}
|