mirror of
https://github.com/arangodb/kube-arangodb.git
synced 2024-12-14 11:57:37 +00:00
104 lines
2.5 KiB
Go
104 lines
2.5 KiB
Go
//
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// DISCLAIMER
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//
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// Copyright 2024 ArangoDB GmbH, Cologne, Germany
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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// Copyright holder is ArangoDB GmbH, Cologne, Germany
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//
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package logging
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import (
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"fmt"
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goSync "sync"
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"time"
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"github.com/arangodb/kube-arangodb/pkg/util/sync"
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)
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// Sampler defines an interface to a log sampler.
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type Sampler interface {
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// Sample returns true if the event should be part of the sample, false if
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// the event should be dropped.
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Sample(level Level, msg string, args ...any) bool
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}
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func NewLogEventSampler(period time.Duration) Sampler {
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return &logEventSampler{
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period: period,
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}
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}
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type logEventSampler struct {
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// period defines the burst period
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period time.Duration
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// lruCache is the thread-safe map of message hash -> timestamp when event happened last time
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lruCache sync.Map[string, int64]
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gcLock goSync.Mutex
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gcCycle uint64
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}
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func (s *logEventSampler) Sample(level Level, format string, args ...any) bool {
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if s.period <= 0 {
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// sampling disabled
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return true
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}
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s.gc()
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hash := s.hash(level, format, args...)
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return s.store(hash)
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}
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func (s *logEventSampler) hash(level Level, format string, args ...any) string {
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msg := fmt.Sprintf(format, args...)
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return fmt.Sprintf("%s_%s", level.String(), msg)
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}
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// store returns true if event hash was not stored, or it was stored more than s.period ago
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func (s *logEventSampler) store(hash string) bool {
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storedAt, _ := s.lruCache.LoadOrStore(hash, 0)
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now := time.Now().UnixNano()
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if now > storedAt {
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newStoredAt := now + s.period.Nanoseconds()
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return s.lruCache.CompareAndSwap(hash, storedAt, newStoredAt)
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}
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return false
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}
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func (s *logEventSampler) gc() {
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s.gcLock.Lock()
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defer s.gcLock.Unlock()
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s.gcCycle++
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if s.gcCycle > 10e5 {
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// run cache cleanup every 10e5 cycles
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s.gcClean()
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s.gcCycle = 0
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}
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}
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func (s *logEventSampler) gcClean() {
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now := time.Now().UnixNano()
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s.lruCache.Range(func(key string, value int64) bool {
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gcPeriod := (time.Minute * 15).Nanoseconds()
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if now-value > gcPeriod {
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s.lruCache.Delete(key)
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}
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return true
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})
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}
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