/
otlphttp.go
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/
otlphttp.go
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// Copyright The OpenTelemetry Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package otlpreceiver
import (
"bytes"
"net/http"
"github.com/gogo/protobuf/jsonpb"
"github.com/grpc-ecosystem/grpc-gateway/runtime"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
"google.golang.org/protobuf/proto"
)
// xProtobufMarshaler is a Marshaler which wraps runtime.ProtoMarshaller
// and sets ContentType to application/x-protobuf
type xProtobufMarshaler struct {
*runtime.ProtoMarshaller
}
// ContentType always returns "application/x-protobuf".
func (*xProtobufMarshaler) ContentType() string {
return "application/x-protobuf"
}
var jsonMarshaller = &jsonpb.Marshaler{}
// errorHandler encodes the HTTP error message inside a rpc.Status message as required
// by the OTLP protocol.
func errorHandler(w http.ResponseWriter, r *http.Request, errMsg string, statusCode int) {
var (
msg []byte
s *status.Status
err error
)
// Pre-computed status with code=Internal to be used in case of a marshaling error.
fallbackMsg := []byte(`{"code": 13, "message": "failed to marshal error message"}`)
fallbackContentType := "application/json"
if statusCode == http.StatusBadRequest {
s = status.New(codes.InvalidArgument, errMsg)
} else {
s = status.New(codes.Internal, errMsg)
}
contentType := r.Header.Get("Content-Type")
if contentType == "application/json" {
buf := new(bytes.Buffer)
err = jsonMarshaller.Marshal(buf, s.Proto())
msg = buf.Bytes()
} else {
msg, err = proto.Marshal(s.Proto())
}
if err != nil {
msg = fallbackMsg
contentType = fallbackContentType
statusCode = http.StatusInternalServerError
}
w.Header().Set("Content-Type", contentType)
w.WriteHeader(statusCode)
w.Write(msg)
}