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buffer_codec.go
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/
buffer_codec.go
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// Copyright 2020-2022 Buf Technologies, Inc.
//
// 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 bufstudioagent
import (
"bytes"
"fmt"
"io"
connect "github.com/bufbuild/connect-go"
"google.golang.org/protobuf/proto"
)
// bufferCodec is a connect.Codec for use with clients of type
// connect.Client[bytes.Buffer, bytes.Buffer] which does not attempt to parse
// messages but instead allows the application layer to work on the buffers
// directly. This is useful for creating proxies.
type bufferCodec struct {
name string
}
var _ connect.Codec = (*bufferCodec)(nil)
func (b *bufferCodec) Name() string { return b.name }
func (b *bufferCodec) Marshal(src any) ([]byte, error) {
switch typedSrc := src.(type) {
case *bytes.Buffer:
return typedSrc.Bytes(), nil
case proto.Message:
// When the codec is named "proto", connect will assume that it
// may also be used to unmarshal the errors in the
// grpc-status-details-bin trailer. The type used is not
// exported so we match against the general proto.Message.
return proto.Marshal(typedSrc)
default:
return nil, fmt.Errorf("marshal unexpected type %T", src)
}
}
func (b *bufferCodec) Unmarshal(src []byte, dst any) error {
switch destination := dst.(type) {
case *bytes.Buffer:
destination.Reset()
_, err := io.Copy(destination, bytes.NewReader(src))
return err
case proto.Message:
// When the codec is named "proto", connect will assume that it
// may also be used to unmarshal the errors in the
// grpc-status-details-bin trailer. The type used is not
// exported so we match against the general proto.Message.
return proto.Unmarshal(src, destination)
default:
return fmt.Errorf("unmarshal unexpected type %T", dst)
}
}