banyand/tsdb/retention.go

// Licensed to Apache Software Foundation (ASF) under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. Apache Software Foundation (ASF) licenses this file to you 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.

package tsdb

import (
	"context"
	"time"

	"github.com/robfig/cron/v3"

	"github.com/apache/skywalking-banyandb/pkg/logger"
)

type retentionTask struct {
	segment  *segmentController
	expr     string
	option   cron.ParseOption
	duration time.Duration
}

func newRetentionTask(segment *segmentController, ttl IntervalRule) *retentionTask {
	var expr string
	switch ttl.Unit {
	case HOUR:
		// Every hour on the 5th minute
		expr = "5 *"
	case DAY:
		// Every day on 00:05
		expr = "5 0"
	}
	return &retentionTask{
		segment:  segment,
		option:   cron.Minute | cron.Hour,
		expr:     expr,
		duration: ttl.estimatedDuration(),
	}
}

func (rc *retentionTask) run(now time.Time, l *logger.Logger) bool {
	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Minute)
	defer cancel()
	if err := rc.segment.remove(ctx, now.Add(-rc.duration)); err != nil {
		l.Error().Err(err)
	}
	return true
}