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package proto
import (
"bytes"
"context"
"errors"
"io/ioutil"
"net/http"
httptransport "github.com/go-kit/kit/transport/http"
"google.golang.org/protobuf/proto"
)
// EncodeProtoRequest is an EncodeRequestFunc that serializes the request as Protobuf.
// If the request implements Headerer, the provided headers will be applied
// to the request. If the given request does not implement proto.Message, an error will
// be returned.
func EncodeProtoRequest(_ context.Context, r *http.Request, preq interface{}) error {
r.Header.Set("Content-Type", "application/x-protobuf")
if headerer, ok := preq.(httptransport.Headerer); ok {
for k := range headerer.Headers() {
r.Header.Set(k, headerer.Headers().Get(k))
}
}
req, ok := preq.(proto.Message)
if !ok {
return errors.New("response does not implement proto.Message")
}
b, err := proto.Marshal(req)
if err != nil {
return err
}
r.ContentLength = int64(len(b))
r.Body = ioutil.NopCloser(bytes.NewReader(b))
return nil
}
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