fix: remove marshaler

.chloggen/add-json-jaeger.yaml

@@ -10,7 +10,7 @@ component: encoding/jaegerencodingextension
 note: Add support for JSON protocol for jaeger codec
 
 # Mandatory: One or more tracking issues related to the change. You can use the PR number here if no issue exists.
-issues: []
+issues: [6272]
 
 # (Optional) One or more lines of additional information to render under the primary note.
 # These lines will be padded with 2 spaces and then inserted directly into the document.

extension/encoding/jaegerencodingextension/extension.go

@@ -5,7 +5,6 @@ package jaegerencodingextension // import "github.com/open-telemetry/opentelemet
 
 import (
 	"context"
-	"errors"
 	"fmt"
 
 	"go.opentelemetry.io/collector/component"
@@ -16,32 +15,22 @@ import (
 
 var _ encoding.TracesUnmarshalerExtension = &jaegerExtension{}
 var _ ptrace.Unmarshaler = &jaegerExtension{}
-var _ ptrace.Marshaler = &jaegerExtension{}
 
 type jaegerExtension struct {
 	config      *Config
 	unmarshaler ptrace.Unmarshaler
-	marshaler   ptrace.Marshaler
 }
 
 func (e *jaegerExtension) UnmarshalTraces(buf []byte) (ptrace.Traces, error) {
 	return e.unmarshaler.UnmarshalTraces(buf)
 }
 
-func (e *jaegerExtension) MarshalTraces(td ptrace.Traces) ([]byte, error) {
-	if e.marshaler == nil {
-		return nil, errors.New("unsupported encoding")
-	}
-	return e.marshaler.MarshalTraces(td)
-}
-
 func (e *jaegerExtension) Start(_ context.Context, _ component.Host) error {
-	e.marshaler = nil
 	switch e.config.Protocol {
 	case JaegerProtocolProtobuf:
 		e.unmarshaler = jaegerProtobufTrace{}
 	case JaegerProtocolJSON:
-		e.unmarshaler = jaegerJsonTrace{}
+		e.unmarshaler = jaegerJSONTrace{}
 	default:
 		return fmt.Errorf("unsupported protocol: %q", e.config.Protocol)
 	}

extension/encoding/jaegerencodingextension/jaeger.go

@@ -25,10 +25,10 @@ func (j jaegerProtobufTrace) UnmarshalTraces(buf []byte) (ptrace.Traces, error)
 	return jaegerSpanToTraces(span)
 }
 
-type jaegerJsonTrace struct {
+type jaegerJSONTrace struct {
 }
 
-func (j jaegerJsonTrace) UnmarshalTraces(buf []byte) (ptrace.Traces, error) {
+func (j jaegerJSONTrace) UnmarshalTraces(buf []byte) (ptrace.Traces, error) {
 	span := &jaegerproto.Span{}
 	err := jsonpb.Unmarshal(bytes.NewReader(buf), span)
 	if err != nil {