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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,79 @@ | ||
| package main | ||
|
|
||
| import ( | ||
| "sync" | ||
| "time" | ||
|
|
||
| "github.com/bits-and-blooms/bloom/v3" | ||
| ) | ||
|
|
||
| type TimestampedMessageID struct { | ||
| ID string | ||
| Timestamp time.Time | ||
| } | ||
|
|
||
| type RollingBloomFilter struct { | ||
| filter *bloom.BloomFilter | ||
| window time.Duration | ||
| messages []TimestampedMessageID | ||
| mutex sync.Mutex | ||
| } | ||
|
|
||
| func NewRollingBloomFilter() *RollingBloomFilter { | ||
| return &RollingBloomFilter{ | ||
| filter: bloom.NewWithEstimates(bloomFilterSize, bloomFilterFPRate), | ||
| window: bloomFilterWindow, | ||
| messages: make([]TimestampedMessageID, 0), | ||
| } | ||
| } | ||
|
|
||
| func (rbf *RollingBloomFilter) Add(messageID string) { | ||
| rbf.mutex.Lock() | ||
| defer rbf.mutex.Unlock() | ||
|
|
||
| rbf.filter.Add([]byte(messageID)) | ||
| rbf.messages = append(rbf.messages, TimestampedMessageID{ | ||
| ID: messageID, | ||
| Timestamp: time.Now(), | ||
| }) | ||
| } | ||
|
|
||
| func (rbf *RollingBloomFilter) Test(messageID string) bool { | ||
| rbf.mutex.Lock() | ||
| defer rbf.mutex.Unlock() | ||
|
|
||
| return rbf.filter.Test([]byte(messageID)) | ||
| } | ||
|
|
||
| func (rbf *RollingBloomFilter) Clean() { | ||
| rbf.mutex.Lock() | ||
| defer rbf.mutex.Unlock() | ||
|
|
||
| cutoff := time.Now().Add(-rbf.window) | ||
| newMessages := make([]TimestampedMessageID, 0) | ||
| newFilter := bloom.NewWithEstimates(bloomFilterSize, bloomFilterFPRate) | ||
|
|
||
| for _, msg := range rbf.messages { | ||
| if msg.Timestamp.After(cutoff) { | ||
| newMessages = append(newMessages, msg) | ||
| newFilter.Add([]byte(msg.ID)) | ||
| } | ||
| } | ||
|
|
||
| rbf.messages = newMessages | ||
| rbf.filter = newFilter | ||
| } | ||
|
|
||
| // MarshalBinary implements the encoding.BinaryMarshaler interface for RollingBloomFilter | ||
| func (rbf *RollingBloomFilter) MarshalBinary() ([]byte, error) { | ||
| rbf.mutex.Lock() | ||
| defer rbf.mutex.Unlock() | ||
| return rbf.filter.MarshalBinary() | ||
| } | ||
|
|
||
| // UnmarshalBinary implements the encoding.BinaryUnmarshaler interface for RollingBloomFilter | ||
| func (rbf *RollingBloomFilter) UnmarshalBinary(data []byte) error { | ||
| rbf.mutex.Lock() | ||
| defer rbf.mutex.Unlock() | ||
| return rbf.filter.UnmarshalBinary(data) | ||
| } |