otelzap: Implement methods on encoder

bridges/otelzap/encoder.go

@@ -40,8 +40,11 @@
 }
 
 func (m *objectEncoder) AddObject(k string, v zapcore.ObjectMarshaler) error {
-	// TODO
-	return nil
+	// TODO: Use objectEncoder from a pool.
+	newobj := newObjectEncoder(2)
+	err := v.MarshalLogObject(newobj)
+	m.kv = append(m.kv, log.Map(k, newobj.kv...))
+	return err
 }
 
 func (m *objectEncoder) AddBinary(k string, v []byte) {
@@ -158,14 +161,20 @@
 	elems []log.Value // nolint:unused
 }
 
-// TODO.
 func (a *arrayEncoder) AppendArray(v zapcore.ArrayMarshaler) error {
-	return nil
+	// TODO: Use arrayEncoder from a pool.
+	arr := &arrayEncoder{}
+	err := v.MarshalLogArray(arr)
+	a.elems = append(a.elems, log.SliceValue(arr.elems...))
+	return err
 }
 
-// TODO.
 func (a *arrayEncoder) AppendObject(v zapcore.ObjectMarshaler) error {
-	return nil
+	// TODO: Use objectEncoder from a pool.
+	m := newObjectEncoder(2)
+	err := v.MarshalLogObject(m)
+	a.elems = append(a.elems, log.MapValue(m.kv...))
+	return err
 }
 
 // TODO.

bridges/otelzap/encoder_test.go

@@ -6,23 +6,47 @@
 package otelzap
 
 import (
+	"errors"
 	"testing"
 	"time"
 
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
+	"go.uber.org/multierr"
 	"go.uber.org/zap/zapcore"
 
 	"go.opentelemetry.io/otel/log"
 )
 
 // Copied from https://github.com/uber-go/zap/blob/b39f8b6b6a44d8371a87610be50cce58eeeaabcb/zapcore/memory_encoder_test.go.
 func TestObjectEncoder(t *testing.T) {
+	// Expected output of a turducken.
+	wantTurducken := map[string]interface{}{
+		"ducks": []interface{}{
+			map[string]interface{}{"in": "chicken"},
+			map[string]interface{}{"in": "chicken"},
+		},
+	}
+
 	tests := []struct {
 		desc     string
 		f        func(zapcore.ObjectEncoder)
 		expected interface{}
 	}{
+		{
+			desc: "AddObject",
+			f: func(e zapcore.ObjectEncoder) {
+				assert.NoError(t, e.AddObject("k", loggable{true}), "Expected AddObject to succeed.")
+			},
+			expected: map[string]interface{}{"loggable": "yes"},
+		},
+		{
+			desc: "AddObject (nested)",
+			f: func(e zapcore.ObjectEncoder) {
+				assert.NoError(t, e.AddObject("k", turducken{}), "Expected AddObject to succeed.")
+			},
+			expected: wantTurducken,
+		},
 		{
 			desc: "AddArray",
 			f: func(e zapcore.ObjectEncoder) {
@@ -35,6 +59,13 @@ func TestObjectEncoder(t *testing.T) {
 			},
 			expected: []interface{}{true, false, true},
 		},
+		{
+			desc: "AddArray (nested)",
+			f: func(e zapcore.ObjectEncoder) {
+				assert.NoError(t, e.AddArray("k", turduckens(2)), "Expected AddArray to succeed.")
+			},
+			expected: []interface{}{wantTurducken, wantTurducken},
+		},
 		{
 			desc:     "AddBinary",
 			f:        func(e zapcore.ObjectEncoder) { e.AddBinary("k", []byte("foo")) },
@@ -164,6 +195,8 @@ func TestArrayEncoder(t *testing.T) {
 		f        func(zapcore.ArrayEncoder)
 		expected interface{}
 	}{
+		// AppendObject and AppendArray are covered by the AddObject (nested) and
+		// AddArray (nested) cases above.
 		{"AppendBool", func(e zapcore.ArrayEncoder) { e.AppendBool(true) }, true},
 		{"AppendByteString", func(e zapcore.ArrayEncoder) { e.AppendByteString([]byte("foo")) }, "foo"},
 		{"AppendFloat64", func(e zapcore.ArrayEncoder) { e.AppendFloat64(3.14) }, 3.14},
@@ -187,6 +220,52 @@ func TestArrayEncoder(t *testing.T) {
 	}
 }
 
+type turducken struct{}
+
+func (t turducken) MarshalLogObject(enc zapcore.ObjectEncoder) error {
+	return enc.AddArray("ducks", zapcore.ArrayMarshalerFunc(func(arr zapcore.ArrayEncoder) error {
+		for i := 0; i < 2; i++ {
+			err := arr.AppendObject(zapcore.ObjectMarshalerFunc(func(inner zapcore.ObjectEncoder) error {
+				inner.AddString("in", "chicken")
+				return nil
+			}))
+			if err != nil {
+				return err
+			}
+		}
+		return nil
+	}))
+}
+
+type turduckens int
+
+func (t turduckens) MarshalLogArray(enc zapcore.ArrayEncoder) error {
+	var err error
+	tur := turducken{}
+	for i := 0; i < int(t); i++ {
+		err = multierr.Append(err, enc.AppendObject(tur))
+	}
+	return err
+}
+
+type loggable struct{ bool }
+
+func (l loggable) MarshalLogObject(enc zapcore.ObjectEncoder) error {
+	if !l.bool {
+		return errors.New("can't marshal")
+	}
+	enc.AddString("loggable", "yes")
+	return nil
+}
+
+func (l loggable) MarshalLogArray(enc zapcore.ArrayEncoder) error {
+	if !l.bool {
+		return errors.New("can't marshal")
+	}
+	enc.AppendBool(true)
+	return nil
+}
+
 func value2Result(v log.Value) any {
 	switch v.Kind() {
 	case log.KindBool:

bridges/otelzap/go.mod

@@ -5,6 +5,7 @@ go 1.21
 require (
 	github.com/stretchr/testify v1.9.0
 	go.opentelemetry.io/otel/log v0.3.0
+	go.uber.org/multierr v1.11.0
 	go.uber.org/zap v1.27.0
 )
 
@@ -16,6 +17,5 @@ require (
 	go.opentelemetry.io/otel v1.27.0 // indirect
 	go.opentelemetry.io/otel/metric v1.27.0 // indirect
 	go.opentelemetry.io/otel/trace v1.27.0 // indirect
-	go.uber.org/multierr v1.11.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )