reputation

package
v1.59.0-rc Latest Latest
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 Go to latest Published: Jul 7, 2022 License: AGPL-3.0 Imports: 10 Imported by: 0

Documentation

Index

Constants

This section is empty.

Variables

View Source 
var (

	// Error is the default reputation errs class.
	Error = errs.Class("reputation")
	// ErrNodeNotFound is returned if a node does not exist in database.
	ErrNodeNotFound = errs.Class("node not found")
)

Functions

func AddAuditToHistory added in v1.56.1 

func AddAuditToHistory(a *pb.AuditHistory, online bool, auditTime time.Time, config AuditHistoryConfig) error

AddAuditToHistory adds a single online/not-online event to an AuditHistory. If the AuditHistory contains windows that are now outside the tracking period, those windows will be trimmed.

func DuplicateAuditHistory added in v1.56.1 

func DuplicateAuditHistory(auditHistory *pb.AuditHistory) *pb.AuditHistory

DuplicateAuditHistory creates a duplicate (deep copy) of an AuditHistory object.

func MergeAuditHistories added in v1.57.1 

func MergeAuditHistories(history *pb.AuditHistory, addHistory []*pb.AuditWindow, config AuditHistoryConfig) (trackingPeriodFull bool)

MergeAuditHistories merges two audit histories into one, including all windows that are present in either input and summing counts for any windows that appear in _both_ inputs. Any windows that are now outside the tracking period will be trimmed.

The history parameter will be mutated to include the windows passed as addHistory.

Returns true if the number of windows in the new history is the maximum possible for the tracking config.

func RecalculateScore added in v1.57.1 

func RecalculateScore(history *pb.AuditHistory)

RecalculateScore calculates and assigns the Score field in a pb.AuditHistory object. The score is calculated by averaging the online percentage in each window (not including the last).

func UpdateReputation added in v1.57.1 

func UpdateReputation(isSuccess bool, alpha, beta, lambda, w float64) (newAlpha, newBeta float64)

UpdateReputation uses the Beta distribution model to determine a node's reputation. lambda is the "forgetting factor" which determines how much past info is kept when determining current reputation score. w is the normalization weight that affects how severely new updates affect the current reputation distribution.

func UpdateReputationMultiple added in v1.57.1 

func UpdateReputationMultiple(count int, alpha, beta, lambda, w float64) (newAlpha, newBeta float64)

UpdateReputationMultiple works like UpdateReputation, but applies multiple successive counts of an event type to the alpha and beta measures.

With the arguments as named, applies 'count' successful audits. To apply negative audits, swap the alpha and beta parameters and return values.

WARNING: GREEK LETTER MATH AHEAD

Applying n successful audit results to an initial alpha value of α₀ gives a new α₁ value of: 

α₁ = λⁿα₀ + λⁿ⁻¹w + λⁿ⁻²w + ... + λ²w + λw + w

The terms with w are the first n terms of a geometric series with coefficient w and common ratio λ. The closed form formula for the sum of those first n terms is (w(1-λⁿ) / (1-λ)) (https://en.wikipedia.org/wiki/Geometric_series#Closed-form_formula). Adding the initial λⁿα₀ term, we get 

α₁ = λⁿα₀ + w(1-λⁿ) / (1-λ)

The formula has the same structure for beta for n _failures_. 

β₁ = λⁿβ₀ + w(1-λⁿ) / (1-λ)

For n _failures_, 

α₁ = λⁿα₀

For n _successes_, 

β₁ = λⁿβ₀

Types

type AuditHistoryConfig 

type AuditHistoryConfig struct {
	WindowSize               time.Duration `help:"The length of time spanning a single audit window" releaseDefault:"12h" devDefault:"5m" testDefault:"10m"`
	TrackingPeriod           time.Duration `` /* 127-byte string literal not displayed */
	GracePeriod              time.Duration `` /* 236-byte string literal not displayed */
	OfflineThreshold         float64       `` /* 226-byte string literal not displayed */
	OfflineDQEnabled         bool          `` /* 134-byte string literal not displayed */
	OfflineSuspensionEnabled bool          `help:"whether nodes will be suspended if they have low online score" releaseDefault:"true" devDefault:"true"`
}

AuditHistoryConfig is a configuration struct defining time periods and thresholds for penalizing nodes for being offline. It is used for downtime suspension and disqualification.

type AuditType 

type AuditType int

AuditType is an enum representing the outcome of a particular audit. 

const (
	// AuditSuccess represents a successful audit.
	AuditSuccess AuditType = iota
	// AuditFailure represents a failed audit.
	AuditFailure
	// AuditUnknown represents an audit that resulted in an unknown error from the node.
	AuditUnknown
	// AuditOffline represents an audit where a node was offline.
	AuditOffline
)

func (AuditType) String added in v1.55.1 

func (auditType AuditType) String() string

type Config 

type Config struct {
	AuditRepairWeight     float64       `help:"weight to apply to audit reputation for total repair reputation calculation" default:"1.0"`
	AuditUplinkWeight     float64       `help:"weight to apply to audit reputation for total uplink reputation calculation" default:"1.0"`
	AuditLambda           float64       `help:"the forgetting factor used to calculate the audit SNs reputation" default:"0.95"`
	AuditWeight           float64       `help:"the normalization weight used to calculate the audit SNs reputation" default:"1.0"`
	AuditDQ               float64       `help:"the reputation cut-off for disqualifying SNs based on audit history" default:"0.6"`
	SuspensionGracePeriod time.Duration `help:"the time period that must pass before suspended nodes will be disqualified" releaseDefault:"168h" devDefault:"1h"`
	SuspensionDQEnabled   bool          `` /* 153-byte string literal not displayed */
	AuditCount            int64         `help:"the number of times a node has been audited to not be considered a New Node" releaseDefault:"100" devDefault:"0"`
	AuditHistory          AuditHistoryConfig
}

Config contains all config values for the reputation service.

type DB 

type DB interface {
	Update(ctx context.Context, request UpdateRequest, now time.Time) (_ *Info, err error)
	Get(ctx context.Context, nodeID storj.NodeID) (*Info, error)
	// ApplyUpdates applies multiple updates (defined by the updates
	// parameter) to a node's reputations record.
	ApplyUpdates(ctx context.Context, nodeID storj.NodeID, updates Mutations, reputationConfig Config, now time.Time) (_ *Info, err error)

	// UnsuspendNodeUnknownAudit unsuspends a storage node for unknown audits.
	UnsuspendNodeUnknownAudit(ctx context.Context, nodeID storj.NodeID) (err error)
	// DisqualifyNode disqualifies a storage node.
	DisqualifyNode(ctx context.Context, nodeID storj.NodeID, disqualifiedAt time.Time, reason overlay.DisqualificationReason) (err error)
	// SuspendNodeUnknownAudit suspends a storage node for unknown audits.
	SuspendNodeUnknownAudit(ctx context.Context, nodeID storj.NodeID, suspendedAt time.Time) (err error)
}

DB is an interface for storing reputation data.

type Info 

type Info struct {
	AuditSuccessCount           int64
	TotalAuditCount             int64
	VettedAt                    *time.Time
	UnknownAuditSuspended       *time.Time
	OfflineSuspended            *time.Time
	UnderReview                 *time.Time
	Disqualified                *time.Time
	DisqualificationReason      overlay.DisqualificationReason
	OnlineScore                 float64
	AuditHistory                *pb.AuditHistory
	AuditReputationAlpha        float64
	AuditReputationBeta         float64
	UnknownAuditReputationAlpha float64
	UnknownAuditReputationBeta  float64
}

Info contains all reputation data to be stored in DB.

type Mutations added in v1.57.1 

type Mutations struct {
	PositiveResults int
	FailureResults  int
	UnknownResults  int
	OfflineResults  int
	OnlineHistory   *pb.AuditHistory
}

Mutations represents changes which should be made to a particular node's reputation, in terms of counts and/or timestamps of events which have occurred. A Mutations record can be applied to a reputations row without prior knowledge of that row's contents.

func UpdateRequestToMutations added in v1.57.1 

func UpdateRequestToMutations(updateReq UpdateRequest, now time.Time) (Mutations, error)

UpdateRequestToMutations transforms an UpdateRequest into the equivalent Mutations structure, which can be used with ApplyUpdates.

type Service 

type Service struct {
	// contains filtered or unexported fields
}

Service handles storing node reputation data and updating the overlay cache when a node's status changes.

func NewService 

func NewService(log *zap.Logger, overlay overlay.DB, db DB, config Config) *Service

NewService creates a new reputation service.

func (*Service) ApplyAudit 

func (service *Service) ApplyAudit(ctx context.Context, nodeID storj.NodeID, reputation overlay.ReputationStatus, result AuditType) (err error)

ApplyAudit receives an audit result and applies it to the relevant node in DB.

func (*Service) Close added in v1.36.1 

func (service *Service) Close() error

Close closes resources.

func (*Service) Get 

func (service *Service) Get(ctx context.Context, nodeID storj.NodeID) (info *Info, err error)

Get returns a node's reputation info from DB. If a node is not found in the DB, default reputation information is returned.

func (*Service) TestDisqualifyNode added in v1.36.1 

func (service *Service) TestDisqualifyNode(ctx context.Context, nodeID storj.NodeID, reason overlay.DisqualificationReason) (err error)

TestDisqualifyNode disqualifies a storage node.

func (*Service) TestSuspendNodeUnknownAudit added in v1.36.1 

func (service *Service) TestSuspendNodeUnknownAudit(ctx context.Context, nodeID storj.NodeID, suspendedAt time.Time) (err error)

TestSuspendNodeUnknownAudit suspends a storage node for unknown audits.

func (*Service) TestUnsuspendNodeUnknownAudit added in v1.36.1 

func (service *Service) TestUnsuspendNodeUnknownAudit(ctx context.Context, nodeID storj.NodeID) (err error)

TestUnsuspendNodeUnknownAudit unsuspends a storage node for unknown audits.

type UpdateAuditHistoryResponse added in v1.36.1 

type UpdateAuditHistoryResponse struct {
	NewScore           float64
	TrackingPeriodFull bool
	History            []byte
}

UpdateAuditHistoryResponse contains information returned by UpdateAuditHistory.

type UpdateRequest 

type UpdateRequest struct {
	NodeID       storj.NodeID
	AuditOutcome AuditType
	// Config is a copy of the Config struct from the satellite.
	// It is part of the UpdateRequest struct in order to be more easily
	// accessible from satellitedb code.
	Config
}

UpdateRequest is used to update a node's reputation status.

Source Files

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