github.com/cloudwego/kitex@v0.9.0/pkg/generic/descriptor/render.go (about)

     1  /*
     2   * Copyright 2021 CloudWeGo Authors
     3   *
     4   * Licensed under the Apache License, Version 2.0 (the "License");
     5   * you may not use this file except in compliance with the License.
     6   * You may obtain a copy of the License at
     7   *
     8   *     http://www.apache.org/licenses/LICENSE-2.0
     9   *
    10   * Unless required by applicable law or agreed to in writing, software
    11   * distributed under the License is distributed on an "AS IS" BASIS,
    12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13   * See the License for the specific language governing permissions and
    14   * limitations under the License.
    15   */
    16  
    17  package descriptor
    18  
    19  import (
    20  	"encoding/json"
    21  	"net/http"
    22  
    23  	"github.com/cloudwego/kitex/pkg/generic/proto"
    24  )
    25  
    26  type Renderer interface {
    27  	Render(w http.ResponseWriter, body interface{}) error
    28  	WriteContentType(w http.ResponseWriter)
    29  }
    30  
    31  type JsonRenderer struct{}
    32  
    33  func (j JsonRenderer) Render(w http.ResponseWriter, body interface{}) error {
    34  	return json.NewEncoder(w).Encode(body)
    35  }
    36  
    37  func (j JsonRenderer) WriteContentType(w http.ResponseWriter) {
    38  	w.Header().Set("Content-Type", MIMEApplicationJson)
    39  }
    40  
    41  type PbRenderer struct{}
    42  
    43  func (p PbRenderer) Render(w http.ResponseWriter, body interface{}) error {
    44  	bytes, err := body.(proto.Message).Marshal()
    45  	if err != nil {
    46  		return err
    47  	}
    48  	_, err = w.Write(bytes)
    49  	return err
    50  }
    51  
    52  func (p PbRenderer) WriteContentType(w http.ResponseWriter) {
    53  	w.Header().Set("Content-Type", MIMEApplicationProtobuf)
    54  }