[feature] Log OTEL internal logs

go.mod

@@ -34,6 +34,7 @@ require (
 	github.com/gin-contrib/gzip v1.0.1
 	github.com/gin-contrib/sessions v1.0.1
 	github.com/gin-gonic/gin v1.10.0
+	github.com/go-logr/logr v1.4.1
 	github.com/go-playground/form/v4 v4.2.1
 	github.com/go-swagger/go-swagger v0.31.0
 	github.com/google/go-cmp v0.6.0
@@ -122,7 +123,6 @@ require (
 	github.com/go-fed/httpsig v1.1.0 // indirect
 	github.com/go-ini/ini v1.67.0 // indirect
 	github.com/go-jose/go-jose/v4 v4.0.2 // indirect
-	github.com/go-logr/logr v1.4.1 // indirect
 	github.com/go-logr/stdr v1.2.2 // indirect
 	github.com/go-openapi/analysis v0.23.0 // indirect
 	github.com/go-openapi/errors v0.22.0 // indirect

internal/log/log.go

@@ -20,6 +20,7 @@ package log
 import (
 	"context"
 	"fmt"
+	"github.com/go-logr/logr"
 	"log/syslog"
 	"os"
 	"strings"
@@ -313,3 +314,96 @@ func args(count int) string {
 
 	return buf.String()
 }
+
+func toFields(keysAndValues ...any) []kv.Field {
+	fields := make([]kv.Field, 0, (len(keysAndValues)+1)/2) // Preallocate slice to half of the input length plus one for odd cases.
+	for i := 0; i < len(keysAndValues); i += 2 {
+		if i+1 < len(keysAndValues) {
+			fields = append(fields, kv.Field{
+				K: fmt.Sprint(keysAndValues[i]),
+				V: keysAndValues[i+1],
+			})
+		} else {
+			fields = append(fields, kv.Field{
+				K: fmt.Sprint(keysAndValues[i]),
+				V: nil,
+			})
+		}
+	}
+	return fields
+}
+
+// int log level mapping from https://pkg.go.dev/go.opentelemetry.io/otel/internal/global#SetLogger
+// "To see Warn messages use a logger with `l.V(1).Enabled() == true`
+// To see Info messages use a logger with `l.V(4).Enabled() == true`
+// To see Debug messages use a logger with `l.V(8).Enabled() == true`."
+func otelLogLevelToGoLoggerLevel(lvl int) level.LEVEL {
+	switch lvl {
+	case 0:
+		return level.ERROR
+	case 1:
+		return level.WARN
+	case 4:
+		return level.INFO
+	case 8:
+		return level.DEBUG
+	default:
+		return level.INFO
+	}
+}
+
+type LogrSink struct {
+	ctx    context.Context
+	fields []kv.Field
+	name   string
+}
+
+// Ensure Logger implements logr.LogSink
+var _ logr.LogSink = &LogrSink{}
+
+func (l LogrSink) Init(_ logr.RuntimeInfo) {}
+
+func (l LogrSink) Enabled(level int) bool {
+	return otelLogLevelToGoLoggerLevel(level) <= loglvl
+}
+
+func (l LogrSink) Info(level int, msg string, keysAndValues ...any) {
+	fields := toFields(keysAndValues...)
+	logf(l.ctx, 5, otelLogLevelToGoLoggerLevel(level), fields, msg)
+}
+
+func (l LogrSink) Error(_ error, msg string, keysAndValues ...any) {
+	fields := toFields(keysAndValues...)
+	logf(l.ctx, 5, level.ERROR, fields, msg)
+}
+
+func (l LogrSink) WithValues(keysAndValues ...any) logr.LogSink {
+	fields := l.fields
+	fields = append(fields, toFields(keysAndValues...)...)
+	return &LogrSink{
+		ctx:    l.ctx,
+		fields: fields,
+		name:   l.name,
+	}
+}
+
+func (l LogrSink) WithName(name string) logr.LogSink {
+	newName := l.name
+	if newName != "" {
+		newName += "/"
+	}
+	newName += name
+	return &LogrSink{
+		ctx:    l.ctx,
+		fields: l.fields,
+		name:   newName,
+	}
+}
+
+func NewLogrSink() logr.LogSink {
+	return &LogrSink{}
+}
+
+func NewLogrLogger() logr.Logger {
+	return logr.New(NewLogrSink())
+}

internal/log/log_test.go

@@ -0,0 +1,69 @@
+// GoToSocial
+// Copyright (C) GoToSocial Authors [email protected]
+// SPDX-License-Identifier: AGPL-3.0-or-later
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package log
+
+import (
+	"testing"
+
+	"codeberg.org/gruf/go-kv"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestToFields(t *testing.T) {
+	tests := []struct {
+		name           string
+		keysAndValues  []any
+		expectedFields []kv.Field
+	}{
+		{
+			name:          "Even number of elements",
+			keysAndValues: []any{"count", 2, "total_dropped", 0},
+			expectedFields: []kv.Field{
+				{K: "count", V: 2},
+				{K: "total_dropped", V: 0},
+			},
+		},
+		{
+			name:          "Odd number of elements",
+			keysAndValues: []any{"count", 2, "whatever"},
+			expectedFields: []kv.Field{
+				{K: "count", V: 2},
+				{K: "whatever", V: nil},
+			},
+		},
+		{
+			name:           "Empty input",
+			keysAndValues:  []any{},
+			expectedFields: []kv.Field{},
+		},
+		{
+			name:          "Single element",
+			keysAndValues: []any{"single"},
+			expectedFields: []kv.Field{
+				{K: "single", V: nil},
+			},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			actualFields := toFields(tt.keysAndValues...)
+			assert.Equal(t, tt.expectedFields, actualFields)
+		})
+	}
+}

internal/tracing/tracing.go

@@ -55,6 +55,9 @@ func Initialize() error {
 
 	insecure := config.GetTracingInsecureTransport()
 
+	// Log internal OTEL logs
+	otel.SetLogger(log.NewLogrLogger())
+
 	var tpo trace.TracerProviderOption
 	switch config.GetTracingTransport() {
 	case "grpc":