replayfilter

Documentation

Overview

Package replayfilter implements a generic replay detection filter with a caller specifiable time-to-live. It only detects if a given byte sequence has been seen before based on the SipHash-2-4 digest of the sequence. Collisions are treated as positive matches, though the probability of this happening is negligible.

Index

• type ReplayFilter
  • func New(ttl time.Duration) (filter *ReplayFilter, err error)
  • func (f *ReplayFilter) TestAndSet(now time.Time, buf []byte) bool

Types

type ReplayFilter

type ReplayFilter struct {
	sync.Mutex
	// contains filtered or unexported fields
}

ReplayFilter is a simple filter designed only to detect if a given byte sequence has been seen before.

func New

func New(ttl time.Duration) (filter *ReplayFilter, err error)

New creates a new ReplayFilter instance.

func (*ReplayFilter) TestAndSet

func (f *ReplayFilter) TestAndSet(now time.Time, buf []byte) bool

TestAndSet queries the filter for a given byte sequence, inserts the sequence, and returns if it was present before the insertion operation.