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snapshot.go
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snapshot.go
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/*
* Copyright (C) 2023 Intergral GmbH
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
package ingester
import (
"context"
"fmt"
"time"
"github.com/intergral/deep/pkg/model"
)
type liveSnapshot struct {
bytes []byte
lastAppend time.Time
snapshotId []byte
start uint32
decoder model.SegmentDecoder
// byte limits
maxBytes int
currentBytes int
}
func newLiveSnapshot(id []byte, maxBytes int) *liveSnapshot {
return &liveSnapshot{
bytes: make([]byte, 0, 10), // 10 for luck
lastAppend: time.Now(),
snapshotId: id,
maxBytes: maxBytes,
decoder: model.MustNewSegmentDecoder(model.CurrentEncoding),
}
}
func (t *liveSnapshot) Push(_ context.Context, instanceID string, snapshot []byte) error {
t.lastAppend = time.Now()
if t.maxBytes != 0 {
reqSize := len(snapshot)
if t.currentBytes+reqSize > t.maxBytes {
return newSnapshotTooLargeError(t.snapshotId, instanceID, t.maxBytes, reqSize)
}
t.currentBytes += reqSize
}
start, err := t.decoder.FastRange(snapshot)
if err != nil {
return fmt.Errorf("failed to get range while adding segment: %w", err)
}
t.bytes = snapshot
t.start = start
return nil
}