PMM-7 logrus to slog (#1062)

* Bump github.com/prometheus/common from 0.62.0 to 0.63.0

Bumps [github.com/prometheus/common](https://github.com/prometheus/common) from 0.62.0 to 0.63.0.
- [Release notes](https://github.com/prometheus/common/releases)
- [Changelog](https://github.com/prometheus/common/blob/main/RELEASE.md)
- [Commits](prometheus/common@v0.62.0...v0.63.0)

---
updated-dependencies:
- dependency-name: github.com/prometheus/common
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

* update promslog levels

* baseline for logrus -> slog migration

* enable diagnostic data tests

* use custom logger for promhttp

* satisfy linter

* tidy go.mod

* surpress linters

* fix formatting

* satisfy linter

* add license headers

* drop format string

* fix formatting

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: idoqo

exporter/base_collector.go

@@ -17,23 +17,23 @@ package exporter
 
 import (
 	"context"
+	"log/slog"
 	"sync"
 
 	"github.com/prometheus/client_golang/prometheus"
-	"github.com/sirupsen/logrus"
 	"go.mongodb.org/mongo-driver/mongo"
 )
 
 type baseCollector struct {
 	client *mongo.Client
-	logger *logrus.Entry
+	logger *slog.Logger
 
 	lock         sync.Mutex
 	metricsCache []prometheus.Metric
 }
 
 // newBaseCollector creates a skeletal collector, which is used to create other collectors.
-func newBaseCollector(client *mongo.Client, logger *logrus.Entry) *baseCollector {
+func newBaseCollector(client *mongo.Client, logger *slog.Logger) *baseCollector {
 	return &baseCollector{
 		client: client,
 		logger: logger,

exporter/collstats_collector.go

@@ -17,10 +17,10 @@ package exporter
 
 import (
 	"context"
+	"log/slog"
 	"strings"
 
 	"github.com/prometheus/client_golang/prometheus"
-	"github.com/sirupsen/logrus"
 	"go.mongodb.org/mongo-driver/bson"
 	"go.mongodb.org/mongo-driver/mongo"
 )
@@ -38,10 +38,10 @@ type collstatsCollector struct {
 }
 
 // newCollectionStatsCollector creates a collector for statistics about collections.
-func newCollectionStatsCollector(ctx context.Context, client *mongo.Client, logger *logrus.Logger, discovery bool, topology labelsGetter, collections []string, enableDetails bool) *collstatsCollector {
+func newCollectionStatsCollector(ctx context.Context, client *mongo.Client, logger *slog.Logger, discovery bool, topology labelsGetter, collections []string, enableDetails bool) *collstatsCollector {
 	return &collstatsCollector{
 		ctx:  ctx,
-		base: newBaseCollector(client, logger.WithFields(logrus.Fields{"collector": "collstats"})),
+		base: newBaseCollector(client, logger.With("collector", "collstats")),
 
 		compatibleMode:  false, // there are no compatible metrics for this collector.
 		discoveringMode: discovery,
@@ -70,7 +70,7 @@ func (d *collstatsCollector) collect(ch chan<- prometheus.Metric) {
 	if d.discoveringMode {
 		onlyCollectionsNamespaces, err := listAllCollections(d.ctx, client, d.collections, systemDBs, true)
 		if err != nil {
-			logger.Errorf("cannot auto discover databases and collections: %s", err.Error())
+			logger.Error("cannot auto discover databases and collections", "error", err.Error())
 
 			return
 		}
@@ -80,7 +80,7 @@ func (d *collstatsCollector) collect(ch chan<- prometheus.Metric) {
 		var err error
 		collections, err = checkNamespacesForViews(d.ctx, client, d.collections)
 		if err != nil {
-			logger.Errorf("cannot list collections: %s", err.Error())
+			logger.Error("cannot list collections", "error", err.Error())
 			return
 		}
 	}
@@ -126,19 +126,19 @@ func (d *collstatsCollector) collect(ch chan<- prometheus.Metric) {
 
 		cursor, err := client.Database(database).Collection(collection).Aggregate(d.ctx, pipeline)
 		if err != nil {
-			logger.Errorf("cannot get $collstats cursor for collection %s.%s: %s", database, collection, err)
+			logger.Error("cannot get $collstats cursor for collection", "database", database, "collection", collection, "error", err)
 
 			continue
 		}
 
 		var stats []bson.M
 		if err = cursor.All(d.ctx, &stats); err != nil {
-			logger.Errorf("cannot get $collstats for collection %s.%s: %s", database, collection, err)
+			logger.Error("cannot get $collstats for collection", "database", database, "collection", collection, "error", err)
 
 			continue
 		}
 
-		logger.Debugf("$collStats metrics for %s.%s", database, collection)
+		logger.Debug("$collStats metrics", "database", database, "collection", collection)
 		debugResult(logger, stats)
 
 		prefix := "collstats"

exporter/collstats_collector_test.go

@@ -23,7 +23,7 @@ import (
 	"time"
 
 	"github.com/prometheus/client_golang/prometheus/testutil"
-	"github.com/sirupsen/logrus"
+	"github.com/prometheus/common/promslog"
 	"github.com/stretchr/testify/assert"
 	"go.mongodb.org/mongo-driver/bson"
 
@@ -53,7 +53,7 @@ func TestCollStatsCollector(t *testing.T) {
 	ti := labelsGetterMock{}
 
 	collection := []string{"testdb.testcol_00", "testdb.testcol_01", "testdb.testcol_02"}
-	logger := logrus.New()
+	logger := promslog.New(&promslog.Config{})
 	c := newCollectionStatsCollector(ctx, client, logger, false, ti, collection, false)
 
 	// The last \n at the end of this string is important

exporter/currentop_collector.go

@@ -17,12 +17,13 @@ package exporter
 
 import (
 	"context"
+	"fmt"
+	"log/slog"
 	"strconv"
 	"time"
 
 	"github.com/pkg/errors"
 	"github.com/prometheus/client_golang/prometheus"
-	"github.com/sirupsen/logrus"
 	"go.mongodb.org/mongo-driver/bson"
 	"go.mongodb.org/mongo-driver/bson/primitive"
 	"go.mongodb.org/mongo-driver/mongo"
@@ -39,12 +40,12 @@ type currentopCollector struct {
 var ErrInvalidOrMissingInprogEntry = errors.New("invalid or missing inprog entry in currentop results")
 
 // newCurrentopCollector creates a collector for being processed queries.
-func newCurrentopCollector(ctx context.Context, client *mongo.Client, logger *logrus.Logger,
+func newCurrentopCollector(ctx context.Context, client *mongo.Client, logger *slog.Logger,
 	compatible bool, topology labelsGetter, currentOpSlowTime string,
 ) *currentopCollector {
 	return &currentopCollector{
 		ctx:               ctx,
-		base:              newBaseCollector(client, logger.WithFields(logrus.Fields{"collector": "currentop"})),
+		base:              newBaseCollector(client, logger.With("collector", "currentop")),
 		compatibleMode:    compatible,
 		topologyInfo:      topology,
 		currentopslowtime: currentOpSlowTime,
@@ -66,7 +67,7 @@ func (d *currentopCollector) collect(ch chan<- prometheus.Metric) {
 	client := d.base.client
 	slowtime, err := time.ParseDuration(d.currentopslowtime)
 	if err != nil {
-		logger.Errorf("Failed to parse slowtime: %s", err)
+		logger.Error("Failed to parse slowtime", "error", err)
 		ch <- prometheus.NewInvalidMetric(prometheus.NewInvalidDesc(err), err)
 		return
 	}
@@ -90,7 +91,7 @@ func (d *currentopCollector) collect(ch chan<- prometheus.Metric) {
 
 	var r primitive.M
 	if err := res.Decode(&r); err != nil {
-		logger.Errorf("Failed to decode currentOp response: %s", err)
+		logger.Error("Failed to decode currentOp response", "error", err)
 		ch <- prometheus.NewInvalidMetric(prometheus.NewInvalidDesc(err), err)
 		return
 	}
@@ -101,7 +102,7 @@ func (d *currentopCollector) collect(ch chan<- prometheus.Metric) {
 	inprog, ok := r["inprog"].(primitive.A)
 
 	if !ok {
-		logger.Errorf("Invalid type primitive.A assertion for 'inprog': %T", r["inprog"])
+		logger.Error(fmt.Sprintf("Invalid type primitive.A assertion for 'inprog': %T", r["inprog"]))
 		ch <- prometheus.NewInvalidMetric(prometheus.NewInvalidDesc(ErrInvalidOrMissingInprogEntry),
 			ErrInvalidOrMissingInprogEntry)
 	}
@@ -115,33 +116,33 @@ func (d *currentopCollector) collect(ch chan<- prometheus.Metric) {
 
 		bsonMapElement, ok := bsonMap.(primitive.M)
 		if !ok {
-			logger.Errorf("Invalid type primitive.M assertion for bsonMap: %T", bsonMapElement)
+			logger.Error(fmt.Sprintf("Invalid type primitive.M assertion for bsonMap: %T", bsonMapElement))
 			continue
 		}
 		opid, ok := bsonMapElement["opid"].(int32)
 		if !ok {
-			logger.Errorf("Invalid type int32 assertion for 'opid': %T", bsonMapElement)
+			logger.Error(fmt.Sprintf("Invalid type int32 assertion for 'opid': %T", bsonMapElement))
 			continue
 		}
 		namespace, ok := bsonMapElement["ns"].(string)
 		if !ok {
-			logger.Errorf("Invalid type string assertion for 'ns': %T", bsonMapElement)
+			logger.Error(fmt.Sprintf("Invalid type string assertion for 'ns': %T", bsonMapElement))
 			continue
 		}
 		db, collection := splitNamespace(namespace)
 		op, ok := bsonMapElement["op"].(string)
 		if !ok {
-			logger.Errorf("Invalid type string assertion for 'op': %T", bsonMapElement)
+			logger.Error(fmt.Sprintf("Invalid type string assertion for 'op': %T", bsonMapElement))
 			continue
 		}
 		desc, ok := bsonMapElement["desc"].(string)
 		if !ok {
-			logger.Errorf("Invalid type string assertion for 'desc': %T", bsonMapElement)
+			logger.Error(fmt.Sprintf("Invalid type string assertion for 'desc': %T", bsonMapElement))
 			continue
 		}
 		microsecs_running, ok := bsonMapElement["microsecs_running"].(int64)
 		if !ok {
-			logger.Errorf("Invalid type int64 assertion for 'microsecs_running': %T", bsonMapElement)
+			logger.Error(fmt.Sprintf("Invalid type int64 assertion for 'microsecs_running': %T", bsonMapElement))
 			continue
 		}
 

exporter/currentop_collector_test.go

@@ -22,7 +22,7 @@ import (
 	"time"
 
 	"github.com/prometheus/client_golang/prometheus/testutil"
-	"github.com/sirupsen/logrus"
+	"github.com/prometheus/common/promslog"
 	"github.com/stretchr/testify/assert"
 	"go.mongodb.org/mongo-driver/bson"
 
@@ -60,7 +60,7 @@ func TestCurrentopCollector(t *testing.T) {
 	ti := labelsGetterMock{}
 	st := "0s"
 
-	c := newCurrentopCollector(ctx, client, logrus.New(), false, ti, st)
+	c := newCurrentopCollector(ctx, client, promslog.New(&promslog.Config{}), false, ti, st)
 
 	// Filter metrics by reason:
 	// 1. The result will be different on different hardware

exporter/dbstats_collector.go

@@ -17,9 +17,9 @@ package exporter
 
 import (
 	"context"
+	"log/slog"
 
 	"github.com/prometheus/client_golang/prometheus"
-	"github.com/sirupsen/logrus"
 	"go.mongodb.org/mongo-driver/bson"
 	"go.mongodb.org/mongo-driver/mongo"
 )
@@ -37,10 +37,10 @@ type dbstatsCollector struct {
 }
 
 // newDBStatsCollector creates a collector for statistics on database storage.
-func newDBStatsCollector(ctx context.Context, client *mongo.Client, logger *logrus.Logger, compatible bool, topology labelsGetter, databaseRegex []string, freeStorage bool) *dbstatsCollector {
+func newDBStatsCollector(ctx context.Context, client *mongo.Client, logger *slog.Logger, compatible bool, topology labelsGetter, databaseRegex []string, freeStorage bool) *dbstatsCollector {
 	return &dbstatsCollector{
 		ctx:  ctx,
-		base: newBaseCollector(client, logger.WithFields(logrus.Fields{"collector": "dbstats"})),
+		base: newBaseCollector(client, logger.With("collector", "dbstats")),
 
 		compatibleMode: compatible,
 		topologyInfo:   topology,
@@ -67,12 +67,12 @@ func (d *dbstatsCollector) collect(ch chan<- prometheus.Metric) {
 
 	dbNames, err := databases(d.ctx, client, d.databaseFilter, nil)
 	if err != nil {
-		logger.Errorf("Failed to get database names: %s", err)
+		logger.Error("Failed to get database names", "error", err)
 
 		return
 	}
 
-	logger.Debugf("getting stats for databases: %v", dbNames)
+	logger.Debug("getting stats for databases", "databases", dbNames)
 	for _, db := range dbNames {
 		var dbStats bson.M
 		var cmd bson.D
@@ -84,12 +84,12 @@ func (d *dbstatsCollector) collect(ch chan<- prometheus.Metric) {
 		r := client.Database(db).RunCommand(d.ctx, cmd)
 		err := r.Decode(&dbStats)
 		if err != nil {
-			logger.Errorf("Failed to get $dbstats for database %s: %s", db, err)
+			logger.Error("Failed to get $dbstats for database", "database", db, "error", err)
 
 			continue
 		}
 
-		logger.Debugf("$dbStats metrics for %s", db)
+		logger.Debug("$dbStats metrics for", "database", db)
 		debugResult(logger, dbStats)
 
 		prefix := "dbstats"

exporter/dbstats_collector_test.go

@@ -23,7 +23,7 @@ import (
 	"time"
 
 	"github.com/prometheus/client_golang/prometheus/testutil"
-	"github.com/sirupsen/logrus"
+	"github.com/prometheus/common/promslog"
 	"github.com/stretchr/testify/assert"
 	"go.mongodb.org/mongo-driver/bson"
 
@@ -58,7 +58,7 @@ func TestDBStatsCollector(t *testing.T) {
 
 	ti := labelsGetterMock{}
 
-	logger := logrus.New()
+	logger := promslog.New(&promslog.Config{})
 	c := newDBStatsCollector(ctx, client, logger, false, ti, []string{dbName}, false)
 	expected := strings.NewReader(`
 	# HELP mongodb_dbstats_collections dbstats.collections

exporter/debug.go

@@ -16,25 +16,25 @@
 package exporter
 
 import (
+	"context"
 	"encoding/json"
 	"fmt"
+	"log/slog"
 	"os"
-
-	"github.com/sirupsen/logrus"
 )
 
-func debugResult(log *logrus.Entry, m interface{}) {
-	if !log.Logger.IsLevelEnabled(logrus.DebugLevel) {
+func debugResult(log *slog.Logger, m interface{}) {
+	if !log.Enabled(context.TODO(), slog.LevelDebug) {
 		return
 	}
 
 	debugStr, err := json.MarshalIndent(m, "", "  ")
 	if err != nil {
-		log.Errorf("cannot marshal struct for debug: %s", err)
+		log.Error("cannot marshal struct for debug", "error", err)
 		return
 	}
 
-	// don't use logrus because:
+	// don't use the passed-in logger because:
 	// 1. It will escape new lines and " making it harder to read and to use
 	// 2. It will add timestamp
 	// 3. This way is easier to copy/paste to put the info in a ticket

exporter/debug_test.go

@@ -20,25 +20,30 @@ import (
 	"os"
 	"testing"
 
-	"github.com/sirupsen/logrus"
+	"github.com/prometheus/common/promslog"
 	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
 	"go.mongodb.org/mongo-driver/bson"
 )
 
 func TestDebug(t *testing.T) {
-	log := logrus.New()
-	log.SetLevel(logrus.DebugLevel)
+	logLevel := promslog.NewLevel()
+	err := logLevel.Set("debug")
+	require.NoError(t, err)
 
 	olderr := os.Stderr
 	r, w, _ := os.Pipe()
 
 	os.Stderr = w
 	defer func() {
 		os.Stderr = olderr
-		logrus.SetLevel(logrus.ErrorLevel)
+		_ = logLevel.Set("error")
 	}()
 
-	log.Out = w
+	log := promslog.New(&promslog.Config{
+		Level:  logLevel,
+		Writer: w,
+	})
 
 	m := bson.M{
 		"f1": 1,
@@ -55,7 +60,7 @@ func TestDebug(t *testing.T) {
   }
 }` + "\n"
 
-	debugResult(log.WithField("component", "test"), m)
+	debugResult(log.With("component", "test"), m)
 	assert.NoError(t, w.Close())
 	out, _ := io.ReadAll(r)