tsdb/agent: use Go standard errors package

Signed-off-by: Matthieu MOREL <matthieu.morel35@gmail.com>

Signed-off-by: Matthieu MOREL <matthieu.morel35@gmail.com>

tsdb/agent/db.go

@@ -15,6 +15,7 @@ package agent
 
 import (
 	"context"
+	"errors"
 	"fmt"
 	"math"
 	"path/filepath"
@@ -24,7 +25,6 @@ import (
 
 	"github.com/go-kit/log"
 	"github.com/go-kit/log/level"
-	"github.com/pkg/errors"
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/common/model"
 	"go.uber.org/atomic"
@@ -263,7 +263,7 @@ func Open(l log.Logger, reg prometheus.Registerer, rs *remote.Storage, dir strin
 
 	w, err := wlog.NewSize(l, reg, dir, opts.WALSegmentSize, opts.WALCompression)
 	if err != nil {
-		return nil, errors.Wrap(err, "creating WAL")
+		return nil, fmt.Errorf("creating WAL: %w", err)
 	}
 
 	db := &DB{
@@ -302,7 +302,7 @@ func Open(l log.Logger, reg prometheus.Registerer, rs *remote.Storage, dir strin
 	if err := db.replayWAL(); err != nil {
 		level.Warn(db.logger).Log("msg", "encountered WAL read error, attempting repair", "err", err)
 		if err := w.Repair(err); err != nil {
-			return nil, errors.Wrap(err, "repair corrupted WAL")
+			return nil, fmt.Errorf("repair corrupted WAL: %w", err)
 		}
 		level.Info(db.logger).Log("msg", "successfully repaired WAL")
 	}
@@ -352,7 +352,7 @@ func (db *DB) replayWAL() error {
 
 	dir, startFrom, err := wlog.LastCheckpoint(db.wal.Dir())
 	if err != nil && err != record.ErrNotFound {
-		return errors.Wrap(err, "find last checkpoint")
+		return fmt.Errorf("find last checkpoint: %w", err)
 	}
 
 	multiRef := map[chunks.HeadSeriesRef]chunks.HeadSeriesRef{}
@@ -360,7 +360,7 @@ func (db *DB) replayWAL() error {
 	if err == nil {
 		sr, err := wlog.NewSegmentsReader(dir)
 		if err != nil {
-			return errors.Wrap(err, "open checkpoint")
+			return fmt.Errorf("open checkpoint: %w", err)
 		}
 		defer func() {
 			if err := sr.Close(); err != nil {
@@ -371,7 +371,7 @@ func (db *DB) replayWAL() error {
 		// A corrupted checkpoint is a hard error for now and requires user
 		// intervention. There's likely little data that can be recovered anyway.
 		if err := db.loadWAL(wlog.NewReader(sr), multiRef); err != nil {
-			return errors.Wrap(err, "backfill checkpoint")
+			return fmt.Errorf("backfill checkpoint: %w", err)
 		}
 		startFrom++
 		level.Info(db.logger).Log("msg", "WAL checkpoint loaded")
@@ -380,14 +380,14 @@ func (db *DB) replayWAL() error {
 	// Find the last segment.
 	_, last, err := wlog.Segments(db.wal.Dir())
 	if err != nil {
-		return errors.Wrap(err, "finding WAL segments")
+		return fmt.Errorf("finding WAL segments: %w", err)
 	}
 
 	// Backfil segments from the most recent checkpoint onwards.
 	for i := startFrom; i <= last; i++ {
 		seg, err := wlog.OpenReadSegment(wlog.SegmentName(db.wal.Dir(), i))
 		if err != nil {
-			return errors.Wrap(err, fmt.Sprintf("open WAL segment: %d", i))
+			return fmt.Errorf("open WAL segment: %d: %w", i, err)
 		}
 
 		sr := wlog.NewSegmentBufReader(seg)
@@ -432,7 +432,7 @@ func (db *DB) loadWAL(r *wlog.Reader, multiRef map[chunks.HeadSeriesRef]chunks.H
 				series, err = dec.Series(rec, series)
 				if err != nil {
 					errCh <- &wlog.CorruptionErr{
-						Err:     errors.Wrap(err, "decode series"),
+						Err:     fmt.Errorf("decode series: %w", err),
 						Segment: r.Segment(),
 						Offset:  r.Offset(),
 					}
@@ -444,7 +444,7 @@ func (db *DB) loadWAL(r *wlog.Reader, multiRef map[chunks.HeadSeriesRef]chunks.H
 				samples, err = dec.Samples(rec, samples)
 				if err != nil {
 					errCh <- &wlog.CorruptionErr{
-						Err:     errors.Wrap(err, "decode samples"),
+						Err:     fmt.Errorf("decode samples: %w", err),
 						Segment: r.Segment(),
 						Offset:  r.Offset(),
 					}
@@ -456,7 +456,7 @@ func (db *DB) loadWAL(r *wlog.Reader, multiRef map[chunks.HeadSeriesRef]chunks.H
 				histograms, err = dec.HistogramSamples(rec, histograms)
 				if err != nil {
 					errCh <- &wlog.CorruptionErr{
-						Err:     errors.Wrap(err, "decode histogram samples"),
+						Err:     fmt.Errorf("decode histogram samples: %w", err),
 						Segment: r.Segment(),
 						Offset:  r.Offset(),
 					}
@@ -468,7 +468,7 @@ func (db *DB) loadWAL(r *wlog.Reader, multiRef map[chunks.HeadSeriesRef]chunks.H
 				floatHistograms, err = dec.FloatHistogramSamples(rec, floatHistograms)
 				if err != nil {
 					errCh <- &wlog.CorruptionErr{
-						Err:     errors.Wrap(err, "decode float histogram samples"),
+						Err:     fmt.Errorf("decode float histogram samples: %w", err),
 						Segment: r.Segment(),
 						Offset:  r.Offset(),
 					}
@@ -482,7 +482,7 @@ func (db *DB) loadWAL(r *wlog.Reader, multiRef map[chunks.HeadSeriesRef]chunks.H
 				continue
 			default:
 				errCh <- &wlog.CorruptionErr{
-					Err:     errors.Errorf("invalid record type %v", dec.Type(rec)),
+					Err:     fmt.Errorf("invalid record type %v", dec.Type(rec)),
 					Segment: r.Segment(),
 					Offset:  r.Offset(),
 				}
@@ -568,7 +568,7 @@ func (db *DB) loadWAL(r *wlog.Reader, multiRef map[chunks.HeadSeriesRef]chunks.H
 		return err
 	default:
 		if r.Err() != nil {
-			return errors.Wrap(r.Err(), "read records")
+			return fmt.Errorf("read records: %w", r.Err())
 		}
 		return nil
 	}
@@ -622,13 +622,13 @@ func (db *DB) truncate(mint int64) error {
 
 	first, last, err := wlog.Segments(db.wal.Dir())
 	if err != nil {
-		return errors.Wrap(err, "get segment range")
+		return fmt.Errorf("get segment range: %w", err)
 	}
 
 	// Start a new segment so low ingestion volume instances don't have more WAL
 	// than needed.
 	if _, err := db.wal.NextSegment(); err != nil {
-		return errors.Wrap(err, "next segment")
+		return fmt.Errorf("next segment: %w", err)
 	}
 
 	last-- // Never consider most recent segment for checkpoint
@@ -656,10 +656,11 @@ func (db *DB) truncate(mint int64) error {
 
 	if _, err = wlog.Checkpoint(db.logger, db.wal, first, last, keep, mint); err != nil {
 		db.metrics.checkpointCreationFail.Inc()
-		if _, ok := errors.Cause(err).(*wlog.CorruptionErr); ok {
+		var cerr *wlog.CorruptionErr
+		if errors.As(err, &cerr) {
 			db.metrics.walCorruptionsTotal.Inc()
 		}
-		return errors.Wrap(err, "create checkpoint")
+		return fmt.Errorf("create checkpoint: %w", err)
 	}
 	if err := db.wal.Truncate(last + 1); err != nil {
 		// If truncating fails, we'll just try it again at the next checkpoint.
@@ -780,11 +781,11 @@ func (a *appender) Append(ref storage.SeriesRef, l labels.Labels, t int64, v flo
 		// equivalent validation code in the TSDB's headAppender.
 		l = l.WithoutEmpty()
 		if l.IsEmpty() {
-			return 0, errors.Wrap(tsdb.ErrInvalidSample, "empty labelset")
+			return 0, fmt.Errorf("empty labelset: %w", tsdb.ErrInvalidSample)
 		}
 
 		if lbl, dup := l.HasDuplicateLabelNames(); dup {
-			return 0, errors.Wrap(tsdb.ErrInvalidSample, fmt.Sprintf(`label name "%s" is not unique`, lbl))
+			return 0, fmt.Errorf(`label name "%s" is not unique: %w`, lbl, tsdb.ErrInvalidSample)
 		}
 
 		var created bool
@@ -841,7 +842,7 @@ func (a *appender) AppendExemplar(ref storage.SeriesRef, _ labels.Labels, e exem
 	e.Labels = e.Labels.WithoutEmpty()
 
 	if lbl, dup := e.Labels.HasDuplicateLabelNames(); dup {
-		return 0, errors.Wrap(tsdb.ErrInvalidExemplar, fmt.Sprintf(`label name "%s" is not unique`, lbl))
+		return 0, fmt.Errorf(`label name "%s" is not unique: %w`, lbl, tsdb.ErrInvalidExemplar)
 	}
 
 	// Exemplar label length does not include chars involved in text rendering such as quotes
@@ -903,11 +904,11 @@ func (a *appender) AppendHistogram(ref storage.SeriesRef, l labels.Labels, t int
 		// equivalent validation code in the TSDB's headAppender.
 		l = l.WithoutEmpty()
 		if l.IsEmpty() {
-			return 0, errors.Wrap(tsdb.ErrInvalidSample, "empty labelset")
+			return 0, fmt.Errorf("empty labelset: %w", tsdb.ErrInvalidSample)
 		}
 
 		if lbl, dup := l.HasDuplicateLabelNames(); dup {
-			return 0, errors.Wrap(tsdb.ErrInvalidSample, fmt.Sprintf(`label name "%s" is not unique`, lbl))
+			return 0, fmt.Errorf(`label name "%s" is not unique: %w`, lbl, tsdb.ErrInvalidSample)
 		}
 
 		var created bool