mirror of https://github.com/docker/cli.git
97 lines
2.5 KiB
Go
97 lines
2.5 KiB
Go
/*
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*
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* Copyright 2024 gRPC authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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// Package proto defines the protobuf codec. Importing this package will
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// register the codec.
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package proto
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import (
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"fmt"
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"google.golang.org/grpc/encoding"
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"google.golang.org/grpc/mem"
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"google.golang.org/protobuf/proto"
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"google.golang.org/protobuf/protoadapt"
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)
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// Name is the name registered for the proto compressor.
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const Name = "proto"
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func init() {
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encoding.RegisterCodecV2(&codecV2{})
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}
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// codec is a CodecV2 implementation with protobuf. It is the default codec for
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// gRPC.
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type codecV2 struct{}
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func (c *codecV2) Marshal(v any) (data mem.BufferSlice, err error) {
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vv := messageV2Of(v)
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if vv == nil {
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return nil, fmt.Errorf("proto: failed to marshal, message is %T, want proto.Message", v)
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}
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size := proto.Size(vv)
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if mem.IsBelowBufferPoolingThreshold(size) {
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buf, err := proto.Marshal(vv)
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if err != nil {
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return nil, err
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}
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data = append(data, mem.SliceBuffer(buf))
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} else {
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pool := mem.DefaultBufferPool()
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buf := pool.Get(size)
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if _, err := (proto.MarshalOptions{}).MarshalAppend((*buf)[:0], vv); err != nil {
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pool.Put(buf)
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return nil, err
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}
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data = append(data, mem.NewBuffer(buf, pool))
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}
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return data, nil
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}
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func (c *codecV2) Unmarshal(data mem.BufferSlice, v any) (err error) {
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vv := messageV2Of(v)
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if vv == nil {
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return fmt.Errorf("failed to unmarshal, message is %T, want proto.Message", v)
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}
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buf := data.MaterializeToBuffer(mem.DefaultBufferPool())
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defer buf.Free()
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// TODO: Upgrade proto.Unmarshal to support mem.BufferSlice. Right now, it's not
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// really possible without a major overhaul of the proto package, but the
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// vtprotobuf library may be able to support this.
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return proto.Unmarshal(buf.ReadOnlyData(), vv)
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}
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func messageV2Of(v any) proto.Message {
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switch v := v.(type) {
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case protoadapt.MessageV1:
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return protoadapt.MessageV2Of(v)
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case protoadapt.MessageV2:
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return v
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}
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return nil
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}
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func (c *codecV2) Name() string {
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return Name
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}
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