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prometheus.go
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prometheus.go
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// Copyright (c) The Thanos Authors.
// Licensed under the Apache License 2.0.
package e2eutil
import (
"bytes"
"context"
"encoding/json"
"fmt"
"io"
"math"
"math/rand"
"net/http"
"os"
"os/exec"
"path"
"path/filepath"
"runtime"
"strings"
"sync"
"syscall"
"testing"
"time"
"github.com/efficientgo/core/testutil"
"github.com/go-kit/log"
"github.com/oklog/ulid"
"github.com/pkg/errors"
"github.com/prometheus/prometheus/model/histogram"
"github.com/prometheus/prometheus/model/labels"
"github.com/prometheus/prometheus/model/timestamp"
"github.com/prometheus/prometheus/storage"
"github.com/prometheus/prometheus/tsdb"
"github.com/prometheus/prometheus/tsdb/chunkenc"
"github.com/prometheus/prometheus/tsdb/index"
"go.uber.org/atomic"
"golang.org/x/sync/errgroup"
"github.com/thanos-io/thanos/pkg/block/metadata"
"github.com/thanos-io/thanos/pkg/runutil"
)
const (
defaultPrometheusVersion = "v0.37.0"
defaultAlertmanagerVersion = "v0.20.0"
defaultMinioVersion = "RELEASE.2022-07-30T05-21-40Z"
// Space delimited list of versions.
promPathsEnvVar = "THANOS_TEST_PROMETHEUS_PATHS"
alertmanagerBinEnvVar = "THANOS_TEST_ALERTMANAGER_PATH"
minioBinEnvVar = "THANOS_TEST_MINIO_PATH"
// A placeholder for actual Prometheus instance address in the scrape config.
PromAddrPlaceHolder = "PROMETHEUS_ADDRESS"
)
var (
histogramSample = histogram.Histogram{
Schema: 0,
Count: 20,
Sum: -3.1415,
ZeroCount: 12,
ZeroThreshold: 0.001,
NegativeSpans: []histogram.Span{
{Offset: 0, Length: 4},
{Offset: 1, Length: 1},
},
NegativeBuckets: []int64{1, 2, -2, 1, -1},
}
floatHistogramSample = histogram.FloatHistogram{
ZeroThreshold: 0.01,
ZeroCount: 5.5,
Count: 15,
Sum: 11.5,
PositiveSpans: []histogram.Span{
{Offset: -2, Length: 2},
{Offset: 1, Length: 3},
},
PositiveBuckets: []float64{0.5, 0, 1.5, 2, 3.5},
NegativeSpans: []histogram.Span{
{Offset: 3, Length: 2},
{Offset: 3, Length: 2},
},
NegativeBuckets: []float64{1.5, 0.5, 2.5, 3},
}
)
func PrometheusBinary() string {
return "prometheus-" + defaultPrometheusVersion
}
func AlertmanagerBinary() string {
b := os.Getenv(alertmanagerBinEnvVar)
if b == "" {
return fmt.Sprintf("alertmanager-%s", defaultAlertmanagerVersion)
}
return b
}
func MinioBinary() string {
b := os.Getenv(minioBinEnvVar)
if b == "" {
return fmt.Sprintf("minio-%s", defaultMinioVersion)
}
return b
}
// Prometheus represents a test instance for integration testing.
// It can be populated with data before being started.
type Prometheus struct {
dir string
db *tsdb.DB
prefix string
binPath string
running bool
cmd *exec.Cmd
disabledCompaction bool
addr string
config string
stdout, stderr bytes.Buffer
}
func NewTSDB() (*tsdb.DB, error) {
dir, err := os.MkdirTemp("", "prometheus-test")
if err != nil {
return nil, err
}
opts := tsdb.DefaultOptions()
opts.RetentionDuration = math.MaxInt64
return tsdb.Open(dir, nil, nil, opts, nil)
}
func ForeachPrometheus(t *testing.T, testFn func(t testing.TB, p *Prometheus)) {
paths := os.Getenv(promPathsEnvVar)
if paths == "" {
paths = PrometheusBinary()
}
for _, path := range strings.Split(paths, " ") {
if ok := t.Run(path, func(t *testing.T) {
p, err := newPrometheus(path, "")
testutil.Ok(t, err)
testFn(t, p)
testutil.Ok(t, p.Stop())
}); !ok {
return
}
}
}
// NewPrometheus creates a new test Prometheus instance that will listen on local address.
// Use ForeachPrometheus if you want to test against set of Prometheus versions.
// TODO(bwplotka): Improve it with https://github.com/thanos-io/thanos/issues/758.
func NewPrometheus() (*Prometheus, error) {
return newPrometheus("", "")
}
// NewPrometheusOnPath creates a new test Prometheus instance that will listen on local address and given prefix path.
func NewPrometheusOnPath(prefix string) (*Prometheus, error) {
return newPrometheus("", prefix)
}
func newPrometheus(binPath, prefix string) (*Prometheus, error) {
if binPath == "" {
binPath = PrometheusBinary()
}
db, err := NewTSDB()
if err != nil {
return nil, err
}
f, err := os.Create(filepath.Join(db.Dir(), "prometheus.yml"))
if err != nil {
return nil, err
}
defer f.Close()
// Some well-known external labels so that we can test label resorting
if _, err = io.WriteString(f, "global:\n external_labels:\n region: eu-west"); err != nil {
return nil, err
}
return &Prometheus{
dir: db.Dir(),
db: db,
prefix: prefix,
binPath: binPath,
addr: "<prometheus-not-started>",
}, nil
}
// Start running the Prometheus instance and return.
func (p *Prometheus) Start(ctx context.Context, l log.Logger) error {
if p.running {
return errors.New("Already started")
}
if err := p.db.Close(); err != nil {
return err
}
if err := p.start(); err != nil {
return err
}
if err := p.waitPrometheusUp(ctx, l, p.prefix); err != nil {
return err
}
return nil
}
func (p *Prometheus) start() error {
port, err := FreePort()
if err != nil {
return err
}
var extra []string
if p.disabledCompaction {
extra = append(extra,
"--storage.tsdb.min-block-duration=2h",
"--storage.tsdb.max-block-duration=2h",
)
}
p.addr = fmt.Sprintf("localhost:%d", port)
// Write the final config to the config file.
// The address placeholder will be replaced with the actual address.
if err := p.writeConfig(strings.ReplaceAll(p.config, PromAddrPlaceHolder, p.addr)); err != nil {
return err
}
args := append([]string{
"--storage.tsdb.retention=2d", // Pass retention cause prometheus since 2.8.0 don't show default value for that flags in web/api: https://github.com/prometheus/prometheus/pull/5433.
"--storage.tsdb.path=" + p.db.Dir(),
"--web.listen-address=" + p.addr,
"--web.route-prefix=" + p.prefix,
"--web.enable-admin-api",
"--config.file=" + filepath.Join(p.db.Dir(), "prometheus.yml"),
}, extra...)
p.cmd = exec.Command(p.binPath, args...)
p.cmd.SysProcAttr = SysProcAttr()
p.stderr.Reset()
p.stdout.Reset()
p.cmd.Stdout = &p.stdout
p.cmd.Stderr = &p.stderr
if err := p.cmd.Start(); err != nil {
return fmt.Errorf("starting Prometheus failed: %w", err)
}
p.running = true
return nil
}
func (p *Prometheus) waitPrometheusUp(ctx context.Context, logger log.Logger, prefix string) error {
if !p.running {
return errors.New("method Start was not invoked.")
}
return runutil.RetryWithLog(logger, time.Second, ctx.Done(), func() error {
r, err := http.Get(fmt.Sprintf("http://%s%s/-/ready", p.addr, prefix))
if err != nil {
return err
}
defer runutil.ExhaustCloseWithLogOnErr(logger, r.Body, "failed to exhaust and close body")
if r.StatusCode != 200 {
return errors.Errorf("Got non 200 response: %v", r.StatusCode)
}
return nil
})
}
func (p *Prometheus) Restart(ctx context.Context, l log.Logger) error {
if err := p.cmd.Process.Signal(syscall.SIGTERM); err != nil {
return errors.Wrap(err, "failed to kill Prometheus. Kill it manually")
}
_ = p.cmd.Wait()
if err := p.start(); err != nil {
return err
}
return p.waitPrometheusUp(ctx, l, p.prefix)
}
// Dir returns TSDB dir.
func (p *Prometheus) Dir() string {
return p.dir
}
// Addr returns correct address after Start method.
func (p *Prometheus) Addr() string {
return p.addr + p.prefix
}
func (p *Prometheus) DisableCompaction() {
p.disabledCompaction = true
}
// SetConfig updates the contents of the config.
func (p *Prometheus) SetConfig(s string) {
p.config = s
}
// writeConfig writes the Prometheus config to the config file.
func (p *Prometheus) writeConfig(config string) (err error) {
f, err := os.Create(filepath.Join(p.dir, "prometheus.yml"))
if err != nil {
return err
}
defer runutil.CloseWithErrCapture(&err, f, "prometheus config")
_, err = f.Write([]byte(config))
return err
}
// Stop terminates Prometheus and clean up its data directory.
func (p *Prometheus) Stop() (rerr error) {
if !p.running {
return nil
}
if p.cmd.Process != nil {
if err := p.cmd.Process.Signal(syscall.SIGTERM); err != nil {
return errors.Wrapf(err, "failed to Prometheus. Kill it manually and clean %s dir", p.db.Dir())
}
err := p.cmd.Wait()
if err != nil {
var exitErr *exec.ExitError
if errors.As(err, &exitErr) {
if exitErr.ExitCode() != -1 {
fmt.Fprintln(os.Stderr, "Prometheus exited with", exitErr.ExitCode())
fmt.Fprintln(os.Stderr, "stdout:\n", p.stdout.String(), "\nstderr:\n", p.stderr.String())
} else {
err = nil
}
}
}
if err != nil {
return fmt.Errorf("waiting for Prometheus to exit: %w", err)
}
}
return p.cleanup()
}
func (p *Prometheus) cleanup() error {
p.running = false
return os.RemoveAll(p.db.Dir())
}
// Appender returns a new appender to populate the Prometheus instance with data.
// All appenders must be closed before Start is called and no new ones must be opened
// afterwards.
func (p *Prometheus) Appender() storage.Appender {
if p.running {
panic("Appender must not be called after start")
}
return p.db.Appender(context.Background())
}
// CreateEmptyBlock produces empty block like it was the case before fix: https://github.com/prometheus/tsdb/pull/374.
// (Prometheus pre v2.7.0).
func CreateEmptyBlock(dir string, mint, maxt int64, extLset labels.Labels, resolution int64) (ulid.ULID, error) {
entropy := rand.New(rand.NewSource(time.Now().UnixNano()))
uid := ulid.MustNew(ulid.Now(), entropy)
if err := os.Mkdir(path.Join(dir, uid.String()), os.ModePerm); err != nil {
return ulid.ULID{}, errors.Wrap(err, "close index")
}
if err := os.Mkdir(path.Join(dir, uid.String(), "chunks"), os.ModePerm); err != nil {
return ulid.ULID{}, errors.Wrap(err, "close index")
}
w, err := index.NewWriter(context.Background(), path.Join(dir, uid.String(), "index"))
if err != nil {
return ulid.ULID{}, errors.Wrap(err, "new index")
}
if err := w.Close(); err != nil {
return ulid.ULID{}, errors.Wrap(err, "close index")
}
m := tsdb.BlockMeta{
Version: 1,
ULID: uid,
MinTime: mint,
MaxTime: maxt,
Compaction: tsdb.BlockMetaCompaction{
Level: 1,
Sources: []ulid.ULID{uid},
},
}
b, err := json.Marshal(&m)
if err != nil {
return ulid.ULID{}, err
}
if err := os.WriteFile(path.Join(dir, uid.String(), "meta.json"), b, os.ModePerm); err != nil {
return ulid.ULID{}, errors.Wrap(err, "saving meta.json")
}
if _, err = metadata.InjectThanos(log.NewNopLogger(), filepath.Join(dir, uid.String()), metadata.Thanos{
Labels: extLset.Map(),
Downsample: metadata.ThanosDownsample{Resolution: resolution},
Source: metadata.TestSource,
}, nil); err != nil {
return ulid.ULID{}, errors.Wrap(err, "finalize block")
}
return uid, nil
}
// CreateBlock writes a block with the given series and numSamples samples each.
// Samples will be in the time range [mint, maxt).
func CreateBlock(
ctx context.Context,
dir string,
series []labels.Labels,
numSamples int,
mint, maxt int64,
extLset labels.Labels,
resolution int64,
hashFunc metadata.HashFunc,
) (id ulid.ULID, err error) {
return createBlock(ctx, dir, series, numSamples, mint, maxt, extLset, resolution, false, hashFunc, chunkenc.ValFloat)
}
// CreateBlockWithTombstone is same as CreateBlock but leaves tombstones which mimics the Prometheus local block.
func CreateBlockWithTombstone(
ctx context.Context,
dir string,
series []labels.Labels,
numSamples int,
mint, maxt int64,
extLset labels.Labels,
resolution int64,
hashFunc metadata.HashFunc,
) (id ulid.ULID, err error) {
return createBlock(ctx, dir, series, numSamples, mint, maxt, extLset, resolution, true, hashFunc, chunkenc.ValFloat)
}
// CreateBlockWithBlockDelay writes a block with the given series and numSamples samples each.
// Samples will be in the time range [mint, maxt)
// Block ID will be created with a delay of time duration blockDelay.
func CreateBlockWithBlockDelay(
ctx context.Context,
dir string,
series []labels.Labels,
numSamples int,
mint, maxt int64,
blockDelay time.Duration,
extLset labels.Labels,
resolution int64,
hashFunc metadata.HashFunc,
) (ulid.ULID, error) {
return createBlockWithDelay(ctx, dir, series, numSamples, mint, maxt, blockDelay, extLset, resolution, hashFunc, chunkenc.ValFloat)
}
// CreateHistogramBlockWithDelay writes a block with the given native histogram series and numSamples samples each.
// Samples will be in the time range [mint, maxt).
func CreateHistogramBlockWithDelay(
ctx context.Context,
dir string,
series []labels.Labels,
numSamples int,
mint, maxt int64,
blockDelay time.Duration,
extLset labels.Labels,
resolution int64,
hashFunc metadata.HashFunc,
) (id ulid.ULID, err error) {
return createBlockWithDelay(ctx, dir, series, numSamples, mint, maxt, blockDelay, extLset, resolution, hashFunc, chunkenc.ValHistogram)
}
// CreateFloatHistogramBlockWithDelay writes a block with the given float native histogram series and numSamples samples each.
// Samples will be in the time range [mint, maxt).
func CreateFloatHistogramBlockWithDelay(
ctx context.Context,
dir string,
series []labels.Labels,
numSamples int,
mint, maxt int64,
blockDelay time.Duration,
extLset labels.Labels,
resolution int64,
hashFunc metadata.HashFunc,
) (id ulid.ULID, err error) {
return createBlockWithDelay(ctx, dir, series, numSamples, mint, maxt, blockDelay, extLset, resolution, hashFunc, chunkenc.ValFloatHistogram)
}
func createBlockWithDelay(ctx context.Context, dir string, series []labels.Labels, numSamples int, mint int64, maxt int64, blockDelay time.Duration, extLset labels.Labels, resolution int64, hashFunc metadata.HashFunc, samplesType chunkenc.ValueType) (ulid.ULID, error) {
blockID, err := createBlock(ctx, dir, series, numSamples, mint, maxt, extLset, resolution, false, hashFunc, samplesType)
if err != nil {
return ulid.ULID{}, errors.Wrap(err, "block creation")
}
id, err := ulid.New(uint64(timestamp.FromTime(timestamp.Time(int64(blockID.Time())).Add(-blockDelay))), bytes.NewReader(blockID.Entropy()))
if err != nil {
return ulid.ULID{}, errors.Wrap(err, "create block id")
}
bdir := path.Join(dir, blockID.String())
m, err := metadata.ReadFromDir(bdir)
if err != nil {
return ulid.ULID{}, errors.Wrap(err, "open meta file")
}
logger := log.NewNopLogger()
m.ULID = id
m.Compaction.Sources = []ulid.ULID{id}
if err := m.WriteToDir(logger, path.Join(dir, blockID.String())); err != nil {
return ulid.ULID{}, errors.Wrap(err, "write meta.json file")
}
return id, os.Rename(path.Join(dir, blockID.String()), path.Join(dir, id.String()))
}
func createBlock(
ctx context.Context,
dir string,
series []labels.Labels,
numSamples int,
mint, maxt int64,
extLset labels.Labels,
resolution int64,
tombstones bool,
hashFunc metadata.HashFunc,
sampleType chunkenc.ValueType,
) (id ulid.ULID, err error) {
headOpts := tsdb.DefaultHeadOptions()
headOpts.ChunkDirRoot = filepath.Join(dir, "chunks")
headOpts.ChunkRange = 10000000000
headOpts.EnableNativeHistograms = *atomic.NewBool(true)
h, err := tsdb.NewHead(nil, nil, nil, nil, headOpts, nil)
if err != nil {
return id, errors.Wrap(err, "create head block")
}
defer func() {
runutil.CloseWithErrCapture(&err, h, "TSDB Head")
if e := os.RemoveAll(headOpts.ChunkDirRoot); e != nil {
err = errors.Wrap(e, "delete chunks dir")
}
}()
var g errgroup.Group
var timeStepSize = (maxt - mint) / int64(numSamples+1)
var batchSize = len(series) / runtime.GOMAXPROCS(0)
r := rand.New(rand.NewSource(int64(numSamples)))
var randMutex sync.Mutex
for len(series) > 0 {
l := batchSize
if len(series) < 1000 {
l = len(series)
}
batch := series[:l]
series = series[l:]
g.Go(func() error {
t := mint
for i := 0; i < numSamples; i++ {
app := h.Appender(ctx)
for _, lset := range batch {
var err error
if sampleType == chunkenc.ValFloat {
randMutex.Lock()
_, err = app.Append(0, lset, t, r.Float64())
randMutex.Unlock()
} else if sampleType == chunkenc.ValHistogram {
_, err = app.AppendHistogram(0, lset, t, &histogramSample, nil)
} else if sampleType == chunkenc.ValFloatHistogram {
_, err = app.AppendHistogram(0, lset, t, nil, &floatHistogramSample)
}
if err != nil {
if rerr := app.Rollback(); rerr != nil {
err = errors.Wrapf(err, "rollback failed: %v", rerr)
}
return errors.Wrap(err, "add sample")
}
}
if err := app.Commit(); err != nil {
return errors.Wrap(err, "commit")
}
t += timeStepSize
}
return nil
})
}
if err := g.Wait(); err != nil {
return id, err
}
c, err := tsdb.NewLeveledCompactor(ctx, nil, log.NewNopLogger(), []int64{maxt - mint}, nil, nil)
if err != nil {
return id, errors.Wrap(err, "create compactor")
}
ids, err := c.Write(dir, h, mint, maxt, nil)
if err != nil {
return id, errors.Wrap(err, "write block")
}
if len(ids) == 0 {
return id, errors.Errorf("nothing to write, asked for %d samples", numSamples)
}
id = ids[0]
blockDir := filepath.Join(dir, id.String())
logger := log.NewNopLogger()
seriesSize, err := gatherMaxSeriesSize(ctx, filepath.Join(blockDir, "index"))
if err != nil {
return id, errors.Wrap(err, "gather max series size")
}
files := []metadata.File{}
if hashFunc != metadata.NoneFunc {
paths := []string{}
if err := filepath.Walk(blockDir, func(path string, info os.FileInfo, err error) error {
if info.IsDir() {
return nil
}
paths = append(paths, path)
return nil
}); err != nil {
return id, errors.Wrapf(err, "walking %s", dir)
}
for _, p := range paths {
pHash, err := metadata.CalculateHash(p, metadata.SHA256Func, log.NewNopLogger())
if err != nil {
return id, errors.Wrapf(err, "calculating hash of %s", blockDir+p)
}
files = append(files, metadata.File{
RelPath: strings.TrimPrefix(p, blockDir+"/"),
Hash: &pHash,
})
}
}
if _, err = metadata.InjectThanos(logger, blockDir, metadata.Thanos{
Labels: extLset.Map(),
Downsample: metadata.ThanosDownsample{Resolution: resolution},
Source: metadata.TestSource,
Files: files,
IndexStats: metadata.IndexStats{SeriesMaxSize: seriesSize},
}, nil); err != nil {
return id, errors.Wrap(err, "finalize block")
}
if !tombstones {
if err = os.Remove(filepath.Join(dir, id.String(), "tombstones")); err != nil {
return id, errors.Wrap(err, "remove tombstones")
}
}
return id, nil
}
func gatherMaxSeriesSize(ctx context.Context, fn string) (int64, error) {
r, err := index.NewFileReader(fn)
if err != nil {
return 0, errors.Wrap(err, "open index file")
}
defer runutil.CloseWithErrCapture(&err, r, "gather index issue file reader")
key, value := index.AllPostingsKey()
p, err := r.Postings(ctx, key, value)
if err != nil {
return 0, errors.Wrap(err, "get all postings")
}
// As of version two all series entries are 16 byte padded. All references
// we get have to account for that to get the correct offset.
offsetMultiplier := 1
version := r.Version()
if version >= 2 {
offsetMultiplier = 16
}
// Per series.
var (
prevId storage.SeriesRef
maxSeriesSize int64
)
for p.Next() {
id := p.At()
if prevId != 0 {
// Approximate size.
seriesSize := int64(id-prevId) * int64(offsetMultiplier)
if seriesSize > maxSeriesSize {
maxSeriesSize = seriesSize
}
}
prevId = id
}
if p.Err() != nil {
return 0, errors.Wrap(err, "walk postings")
}
return maxSeriesSize, nil
}
// CreateBlockWithChurn writes a block with the given series. Start time of each series
// will be randomized in the given time window to create churn. Only float chunk is supported right now.
func CreateBlockWithChurn(
ctx context.Context,
rnd *rand.Rand,
dir string,
series []labels.Labels,
numSamples int,
mint, maxt int64,
extLset labels.Labels,
resolution int64,
scrapeInterval int64,
seriesSize int64,
) (id ulid.ULID, err error) {
headOpts := tsdb.DefaultHeadOptions()
headOpts.ChunkDirRoot = filepath.Join(dir, "chunks")
headOpts.ChunkRange = 10000000000
h, err := tsdb.NewHead(nil, nil, nil, nil, headOpts, nil)
if err != nil {
return id, errors.Wrap(err, "create head block")
}
defer func() {
runutil.CloseWithErrCapture(&err, h, "TSDB Head")
if e := os.RemoveAll(headOpts.ChunkDirRoot); e != nil {
err = errors.Wrap(e, "delete chunks dir")
}
}()
app := h.Appender(ctx)
for i := 0; i < len(series); i++ {
var ref storage.SeriesRef
start := RandRange(rnd, mint, maxt)
for j := 0; j < numSamples; j++ {
if ref == 0 {
ref, err = app.Append(0, series[i], start, float64(i+j))
} else {
ref, err = app.Append(ref, series[i], start, float64(i+j))
}
if err != nil {
if rerr := app.Rollback(); rerr != nil {
err = errors.Wrapf(err, "rollback failed: %v", rerr)
}
return id, errors.Wrap(err, "add sample")
}
start += scrapeInterval
if start > maxt {
break
}
}
}
if err := app.Commit(); err != nil {
return id, errors.Wrap(err, "commit")
}
c, err := tsdb.NewLeveledCompactor(ctx, nil, log.NewNopLogger(), []int64{maxt - mint}, nil, nil)
if err != nil {
return id, errors.Wrap(err, "create compactor")
}
ids, err := c.Write(dir, h, mint, maxt, nil)
if err != nil {
return id, errors.Wrap(err, "write block")
}
if len(ids) == 0 {
return id, errors.Errorf("nothing to write, asked for %d samples", numSamples)
}
id = ids[0]
blockDir := filepath.Join(dir, id.String())
logger := log.NewNopLogger()
if _, err = metadata.InjectThanos(logger, blockDir, metadata.Thanos{
Labels: extLset.Map(),
Downsample: metadata.ThanosDownsample{Resolution: resolution},
Source: metadata.TestSource,
IndexStats: metadata.IndexStats{SeriesMaxSize: seriesSize},
}, nil); err != nil {
return id, errors.Wrap(err, "finalize block")
}
return id, nil
}
// AddDelay rewrites a given block with delay.
func AddDelay(blockID ulid.ULID, dir string, blockDelay time.Duration) (ulid.ULID, error) {
id, err := ulid.New(uint64(timestamp.FromTime(timestamp.Time(int64(blockID.Time())).Add(-blockDelay))), bytes.NewReader(blockID.Entropy()))
if err != nil {
return ulid.ULID{}, errors.Wrap(err, "create block id")
}
bdir := path.Join(dir, blockID.String())
m, err := metadata.ReadFromDir(bdir)
if err != nil {
return ulid.ULID{}, errors.Wrap(err, "open meta file")
}
logger := log.NewNopLogger()
m.ULID = id
m.Compaction.Sources = []ulid.ULID{id}
if err := m.WriteToDir(logger, path.Join(dir, blockID.String())); err != nil {
return ulid.ULID{}, errors.Wrap(err, "write meta.json file")
}
return id, os.Rename(path.Join(dir, blockID.String()), path.Join(dir, id.String()))
}