use Go standard errors

.golangci.yml

@@ -5,6 +5,12 @@ run:
 # Run only staticcheck and goimports for now. Additional linters will be enabled one-by-one.
 linters:
   enable:
-  - staticcheck
-  - goimports
+    - errorlint
+    - gofumpt
+    - goimports
+    - staticcheck
   disable-all: true
+
+linters-settings:
+  goimports:
+    local-prefixes: github.com/prometheus/graphite_exporter

cmd/getool/backfill.go

@@ -18,6 +18,7 @@ package main
 
 import (
 	"context"
+	"errors"
 	"fmt"
 	"math"
 	"os"
@@ -29,12 +30,12 @@ import (
 	"github.com/alecthomas/units"
 	"github.com/go-kit/log"
 	"github.com/go-kit/log/level"
-	"github.com/pkg/errors"
-	"github.com/prometheus/graphite_exporter/reader"
 	"github.com/prometheus/prometheus/pkg/labels"
 	"github.com/prometheus/prometheus/tsdb"
 	tsdb_errors "github.com/prometheus/prometheus/tsdb/errors"
 	"github.com/prometheus/statsd_exporter/pkg/mapper"
+
+	"github.com/prometheus/graphite_exporter/reader"
 )
 
 var invalidMetricChars = regexp.MustCompile("[^a-zA-Z0-9_:]")
@@ -68,7 +69,7 @@ func createBlocks(input reader.DBReader, mint, maxt, blockDuration int64, maxSam
 			// original interval later.
 			w, err := tsdb.NewBlockWriter(log.NewNopLogger(), outputDir, 2*blockDuration)
 			if err != nil {
-				return errors.Wrap(err, "block writer")
+				return fmt.Errorf("block writer: %w", err)
 			}
 			defer func() {
 				err = tsdb_errors.NewMulti(err, w.Close()).Err()
@@ -104,7 +105,7 @@ func createBlocks(input reader.DBReader, mint, maxt, blockDuration int64, maxSam
 				}
 				for _, point := range points {
 					if _, err := app.Add(l, point.Timestamp, point.Value); err != nil {
-						return errors.Wrap(err, "add sample")
+						return fmt.Errorf("add sample: %w", err)
 					}
 
 					samplesCount++
@@ -116,7 +117,7 @@ func createBlocks(input reader.DBReader, mint, maxt, blockDuration int64, maxSam
 					// Therefore the old appender is committed and a new one is created.
 					// This prevents keeping too many samples lined up in an appender and thus in RAM.
 					if err := app.Commit(); err != nil {
-						return errors.Wrap(err, "commit")
+						return fmt.Errorf("commit: %w", err)
 					}
 
 					app = w.Appender(ctx)
@@ -125,15 +126,15 @@ func createBlocks(input reader.DBReader, mint, maxt, blockDuration int64, maxSam
 			}
 
 			if err := app.Commit(); err != nil {
-				return errors.Wrap(err, "commit")
+				return fmt.Errorf("commit: %w", err)
 			}
 
 			block, err := w.Flush(ctx)
-			switch err {
-			case nil:
+			switch {
+			case err == nil:
 				blocks, err := db.Blocks()
 				if err != nil {
-					return errors.Wrap(err, "get blocks")
+					return fmt.Errorf("get blocks: %w", err)
 				}
 				for _, b := range blocks {
 					if b.Meta().ULID == block {
@@ -142,20 +143,18 @@ func createBlocks(input reader.DBReader, mint, maxt, blockDuration int64, maxSam
 						break
 					}
 				}
-			case tsdb.ErrNoSeriesAppended:
+			case errors.Is(err, tsdb.ErrNoSeriesAppended):
 			default:
-				return errors.Wrap(err, "flush")
+				return fmt.Errorf("flush: %w", err)
 			}
 
 			return nil
 		}()
-
 		if err != nil {
-			return errors.Wrap(err, "process blocks")
+			return fmt.Errorf("process blocks: %w", err)
 		}
 	}
 	return nil
-
 }
 
 func printBlocks(blocks []tsdb.BlockReader, writeHeader, humanReadable bool) {
@@ -201,7 +200,7 @@ func backfill(maxSamplesInAppender int, inputDir, outputDir, mappingConfig strin
 	wdb := reader.NewReader(inputDir)
 	mint, maxt, err := wdb.GetMinAndMaxTimestamps()
 	if err != nil {
-		return errors.Wrap(err, "getting min and max timestamp")
+		return fmt.Errorf("getting min and max timestamp: %w", err)
 	}
 	metricMapper := &mapper.MetricMapper{}
 
@@ -214,7 +213,10 @@ func backfill(maxSamplesInAppender int, inputDir, outputDir, mappingConfig strin
 		}
 	}
 
-	return errors.Wrap(createBlocks(wdb, mint, maxt, blockDuration, maxSamplesInAppender, outputDir, metricMapper, strictMatch, humanReadable), "block creation")
+	if err := createBlocks(wdb, mint, maxt, blockDuration, maxSamplesInAppender, outputDir, metricMapper, strictMatch, humanReadable); err != nil {
+		return fmt.Errorf("block creation: %w", err)
+	}
+	return nil
 }
 
 func backfillWhisper(inputDir, outputDir, mappingConfig string, strictMatch, humanReadable bool, optBlockDuration time.Duration) (err error) {
@@ -224,8 +226,8 @@ func backfillWhisper(inputDir, outputDir, mappingConfig string, strictMatch, hum
 		return fmt.Errorf("invalid block duration: %s", optBlockDuration.String())
 	}
 
-	if err := os.MkdirAll(outputDir, 0777); err != nil {
-		return errors.Wrap(err, "create output dir")
+	if err := os.MkdirAll(outputDir, 0o777); err != nil {
+		return fmt.Errorf("create output dir: %w", err)
 	}
 
 	return backfill(5000, inputDir, outputDir, mappingConfig, strictMatch, humanReadable, blockDuration)

cmd/getool/backfill_test.go

@@ -43,7 +43,7 @@ func TestBackfill(t *testing.T) {
 		whisperDir = filepath.Join(tmpData, "whisper", "load", "cpu")
 	)
 
-	require.NoError(t, os.MkdirAll(whisperDir, 0777))
+	require.NoError(t, os.MkdirAll(whisperDir, 0o777))
 	retentions, err := whisper.ParseRetentionDefs("1s:3600")
 	require.NoError(t, err)
 	wsp, err := whisper.Create(filepath.Join(whisperDir, "cpu0.wsp"), retentions, whisper.Sum, 0.5)
@@ -68,7 +68,7 @@ func TestBackfill(t *testing.T) {
 	err = cmd.Wait()
 	require.NoError(t, err)
 
-	require.NoError(t, os.MkdirAll(filepath.Join(tmpData, "data", "wal"), 0777))
+	require.NoError(t, os.MkdirAll(filepath.Join(tmpData, "data", "wal"), 0o777))
 
 	db, err := tsdb.OpenDBReadOnly(filepath.Join(tmpData, "data"), nil)
 	require.NoError(t, err)

cmd/getool/main_test.go

@@ -19,8 +19,10 @@ import (
 	"testing"
 )
 
-var testPath = os.Args[0]
-var tmpData = filepath.Join(os.TempDir(), "graphite_expoter_test")
+var (
+	testPath = os.Args[0]
+	tmpData  = filepath.Join(os.TempDir(), "graphite_expoter_test")
+)
 
 func TestMain(m *testing.M) {
 	for i, arg := range os.Args {

cmd/graphite_exporter/main.go

@@ -33,10 +33,11 @@ import (
 	"github.com/prometheus/common/version"
 	"github.com/prometheus/exporter-toolkit/web"
 	"github.com/prometheus/exporter-toolkit/web/kingpinflag"
-	"github.com/prometheus/graphite_exporter/collector"
 	"github.com/prometheus/statsd_exporter/pkg/mapper"
 	"github.com/prometheus/statsd_exporter/pkg/mappercache/lru"
 	"github.com/prometheus/statsd_exporter/pkg/mappercache/randomreplacement"
+
+	"github.com/prometheus/graphite_exporter/collector"
 )
 
 var (

collector/collector_benchmark_test.go

@@ -65,11 +65,8 @@ type mockMapper struct {
 }
 
 func (m *mockMapper) GetMapping(metricName string, metricType mapper.MetricType) (*mapper.MetricMapping, prometheus.Labels, bool) {
-
 	mapping := mapper.MetricMapping{Name: m.name, Action: m.action}
-
 	return &mapping, m.labels, m.present
-
 }
 
 func (m *mockMapper) InitFromFile(string) error {
@@ -106,9 +103,11 @@ func benchmarkProcessLine(b *testing.B, line string) {
 func BenchmarkProcessLineMixed1(b *testing.B) {
 	benchmarkProcessLines(1, b, input)
 }
+
 func BenchmarkProcessLineMixed5(b *testing.B) {
 	benchmarkProcessLines(5, b, input)
 }
+
 func BenchmarkProcessLineMixed50(b *testing.B) {
 	benchmarkProcessLines(50, b, input)
 }
@@ -117,6 +116,7 @@ func BenchmarkProcessLineMixed50(b *testing.B) {
 func BenchmarkProcessLineUntagged(b *testing.B) {
 	benchmarkProcessLine(b, untaggedLine)
 }
+
 func BenchmarkProcessLineTagged(b *testing.B) {
 	benchmarkProcessLine(b, taggedLine)
 }

collector/collector_test.go

@@ -75,7 +75,6 @@ func TestParseNameAndTags(t *testing.T) {
 }
 
 func TestProcessLine(t *testing.T) {
-
 	type testCase struct {
 		line           string
 		name           string

e2e/issue90_test.go

@@ -98,5 +98,4 @@ func TestIssue90(t *testing.T) {
 	if resp.StatusCode != 200 {
 		t.Errorf("unexpected status, want 200, got %v, body: %s", resp.Status, b)
 	}
-
 }

go.mod

@@ -9,7 +9,6 @@ require (
 	github.com/alecthomas/units v0.0.0-20231202071711-9a357b53e9c9
 	github.com/go-graphite/go-whisper v0.0.0-20230526115116-e3110f57c01c
 	github.com/go-kit/log v0.2.1
-	github.com/pkg/errors v0.9.1
 	github.com/prometheus/client_golang v1.19.0
 	github.com/prometheus/common v0.49.0
 	github.com/prometheus/exporter-toolkit v0.11.0
@@ -31,6 +30,7 @@ require (
 	github.com/jpillora/backoff v1.0.0 // indirect
 	github.com/mwitkow/go-conntrack v0.0.0-20190716064945-2f068394615f // indirect
 	github.com/oklog/ulid v1.3.1 // indirect
+	github.com/pkg/errors v0.9.1 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/prometheus/client_model v0.6.0 // indirect
 	github.com/prometheus/procfs v0.12.0 // indirect