response.go

// MIT License
//
// Copyright (c) 2020 Lack
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.

package grpc

import (
	"strings"

	"google.golang.org/grpc"
	"google.golang.org/grpc/encoding"

	"github.com/lack-io/vine/core/codec"
	"github.com/lack-io/vine/core/codec/bytes"
)

type response struct {
	conn   *grpc.ClientConn
	stream grpc.ClientStream
	codec  encoding.Codec
	gcodec codec.Codec
}

// Codec reads the response
func (r *response) Codec() codec.Reader {
	return r.gcodec
}

// Header reads the header
func (r *response) Header() map[string]string {
	md, err := r.stream.Header()
	if err != nil {
		return map[string]string{}
	}
	hdr := make(map[string]string, len(md))
	for k, v := range md {
		hdr[k] = strings.Join(v, ",")
	}
	return hdr
}

// Read the undecoded response
func (r *response) Read() ([]byte, error) {
	f := &bytes.Frame{}
	if err := r.gcodec.ReadBody(f); err != nil {
		return nil, err
	}
	return f.Data, nil
}