91 lines
2.4 KiB
Go
91 lines
2.4 KiB
Go
// Copyright 2019 The Prometheus Authors
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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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package tsdb
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import (
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"context"
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"fmt"
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"os"
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"path/filepath"
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"github.com/go-kit/kit/log"
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"github.com/prometheus/prometheus/pkg/labels"
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)
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var ErrInvalidTimes = fmt.Errorf("max time is lesser than min time")
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type MetricSample struct {
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TimestampMs int64
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Value float64
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Labels labels.Labels
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}
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// CreateHead creates a TSDB writer head to write the sample data to.
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func CreateHead(samples []*MetricSample, chunkRange int64, chunkDir string, logger log.Logger) (*Head, error) {
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head, err := NewHead(nil, logger, nil, chunkRange, chunkDir, nil, DefaultStripeSize, nil)
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if err != nil {
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return nil, err
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}
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app := head.Appender()
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for _, sample := range samples {
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_, err = app.Add(sample.Labels, sample.TimestampMs, sample.Value)
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if err != nil {
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return nil, err
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}
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}
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err = app.Commit()
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if err != nil {
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return nil, err
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}
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return head, nil
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}
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// CreateBlock creates a chunkrange block from the samples passed to it, and writes it to disk.
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func CreateBlock(samples []*MetricSample, dir string, mint, maxt int64, logger log.Logger) (string, error) {
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chunkRange := maxt - mint
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if chunkRange == 0 {
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chunkRange = DefaultBlockDuration
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}
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if chunkRange < 0 {
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return "", ErrInvalidTimes
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}
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chunkDir := filepath.Join(dir, "chunks_tmp")
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defer func() {
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os.RemoveAll(chunkDir)
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}()
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head, err := CreateHead(samples, chunkRange, chunkDir, logger)
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if err != nil {
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return "", err
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}
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defer head.Close()
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compactor, err := NewLeveledCompactor(context.Background(), nil, logger, ExponentialBlockRanges(DefaultBlockDuration, 3, 5), nil)
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if err != nil {
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return "", err
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}
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err = os.MkdirAll(dir, 0777)
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if err != nil {
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return "", err
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}
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ulid, err := compactor.Write(dir, head, mint, maxt, nil)
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if err != nil {
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return "", err
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}
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return filepath.Join(dir, ulid.String()), nil
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}
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