forked from apache/beam
/
any.go
101 lines (87 loc) · 2.88 KB
/
any.go
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// Licensed to the Apache Software Foundation (ASF) under one or more
// contributor license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright ownership.
// The ASF licenses this file to You 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 protox
import (
"fmt"
"github.com/golang/protobuf/proto"
protobuf "github.com/golang/protobuf/ptypes/any"
protobufw "github.com/golang/protobuf/ptypes/wrappers"
)
const (
bytesValueTypeURL = "type.googleapis.com/google.protobuf.BytesValue"
)
// Unpack decodes a proto.
func Unpack(data *protobuf.Any, url string, ret proto.Message) error {
if data.TypeUrl != url {
return fmt.Errorf("Bad type: %v, want %v", data.TypeUrl, url)
}
return proto.Unmarshal(data.Value, ret)
}
// UnpackProto decodes a BytesValue wrapped proto.
func UnpackProto(data *protobuf.Any, ret proto.Message) error {
buf, err := UnpackBytes(data)
if err != nil {
return err
}
return proto.Unmarshal(buf, ret)
}
// PackProto encodes a proto message and wraps into a BytesValue.
func PackProto(in proto.Message) (*protobuf.Any, error) {
b, err := proto.Marshal(in)
if err != nil {
return nil, err
}
return PackBytes(b)
}
// UnpackBase64Proto decodes a BytesValue + base64 wrapped proto.
func UnpackBase64Proto(data *protobuf.Any, ret proto.Message) error {
buf, err := UnpackBytes(data)
if err != nil {
return err
}
return DecodeBase64(string(buf), ret)
}
// PackBase64Proto encodes a proto message into a base64-encoded BytesValue message.
func PackBase64Proto(in proto.Message) (*protobuf.Any, error) {
data, err := EncodeBase64(in)
if err != nil {
return nil, err
}
return PackBytes([]byte(data))
}
// UnpackBytes removes the BytesValue wrapper.
func UnpackBytes(data *protobuf.Any) ([]byte, error) {
if data.TypeUrl != bytesValueTypeURL {
return nil, fmt.Errorf("Bad type: %v, want %v", data.TypeUrl, bytesValueTypeURL)
}
var buf protobufw.BytesValue
if err := proto.Unmarshal(data.Value, &buf); err != nil {
return nil, fmt.Errorf("BytesValue unmarshal failed: %v", err)
}
return buf.Value, nil
}
// PackBytes applies a BytesValue wrapper to the supplied bytes.
func PackBytes(in []byte) (*protobuf.Any, error) {
var buf protobufw.BytesValue
buf.Value = in
b, err := proto.Marshal(&buf)
if err != nil {
return nil, err
}
var out protobuf.Any
out.TypeUrl = bytesValueTypeURL
out.Value = b
return &out, nil
}