mirror of
https://github.com/arangodb/kube-arangodb.git
synced 2024-12-15 17:51:03 +00:00
73df6a0771
Co-authored-by: Adam Janikowski <12255597+ajanikow@users.noreply.github.com>
104 lines
2.5 KiB
Go
104 lines
2.5 KiB
Go
//
|
|
// DISCLAIMER
|
|
//
|
|
// Copyright 2024 ArangoDB GmbH, Cologne, Germany
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
//
|
|
// Copyright holder is ArangoDB GmbH, Cologne, Germany
|
|
//
|
|
|
|
package logging
|
|
|
|
import (
|
|
"fmt"
|
|
goSync "sync"
|
|
"time"
|
|
|
|
"github.com/arangodb/kube-arangodb/pkg/util/sync"
|
|
)
|
|
|
|
// Sampler defines an interface to a log sampler.
|
|
type Sampler interface {
|
|
// Sample returns true if the event should be part of the sample, false if
|
|
// the event should be dropped.
|
|
Sample(level Level, msg string, args ...any) bool
|
|
}
|
|
|
|
func NewLogEventSampler(period time.Duration) Sampler {
|
|
return &logEventSampler{
|
|
period: period,
|
|
}
|
|
}
|
|
|
|
type logEventSampler struct {
|
|
// period defines the burst period
|
|
period time.Duration
|
|
|
|
// lruCache is the thread-safe map of message hash -> timestamp when event happened last time
|
|
lruCache sync.Map[string, int64]
|
|
|
|
gcLock goSync.Mutex
|
|
gcCycle uint64
|
|
}
|
|
|
|
func (s *logEventSampler) Sample(level Level, format string, args ...any) bool {
|
|
if s.period <= 0 {
|
|
// sampling disabled
|
|
return true
|
|
}
|
|
|
|
s.gc()
|
|
|
|
hash := s.hash(level, format, args...)
|
|
return s.store(hash)
|
|
}
|
|
|
|
func (s *logEventSampler) hash(level Level, format string, args ...any) string {
|
|
msg := fmt.Sprintf(format, args...)
|
|
return fmt.Sprintf("%s_%s", level.String(), msg)
|
|
}
|
|
|
|
// store returns true if event hash was not stored, or it was stored more than s.period ago
|
|
func (s *logEventSampler) store(hash string) bool {
|
|
storedAt, _ := s.lruCache.LoadOrStore(hash, 0)
|
|
now := time.Now().UnixNano()
|
|
if now > storedAt {
|
|
newStoredAt := now + s.period.Nanoseconds()
|
|
return s.lruCache.CompareAndSwap(hash, storedAt, newStoredAt)
|
|
}
|
|
return false
|
|
}
|
|
|
|
func (s *logEventSampler) gc() {
|
|
s.gcLock.Lock()
|
|
defer s.gcLock.Unlock()
|
|
|
|
s.gcCycle++
|
|
if s.gcCycle > 10e5 {
|
|
// run cache cleanup every 10e5 cycles
|
|
s.gcClean()
|
|
s.gcCycle = 0
|
|
}
|
|
}
|
|
|
|
func (s *logEventSampler) gcClean() {
|
|
now := time.Now().UnixNano()
|
|
s.lruCache.Range(func(key string, value int64) bool {
|
|
gcPeriod := (time.Minute * 15).Nanoseconds()
|
|
if now-value > gcPeriod {
|
|
s.lruCache.Delete(key)
|
|
}
|
|
return true
|
|
})
|
|
}
|