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proto_json_payload_converter.go
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/
proto_json_payload_converter.go
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// The MIT License
//
// Copyright (c) 2020 Temporal Technologies Inc. All rights reserved.
//
// Copyright (c) 2020 Uber Technologies, Inc.
//
// 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 converter
import (
"bytes"
"encoding/json"
"fmt"
"reflect"
gogojsonpb "github.com/gogo/protobuf/jsonpb"
gogoproto "github.com/gogo/protobuf/proto"
commonpb "go.temporal.io/api/common/v1"
"google.golang.org/protobuf/encoding/protojson"
"google.golang.org/protobuf/proto"
)
// ProtoJSONPayloadConverter converts proto objects to/from JSON.
type ProtoJSONPayloadConverter struct {
gogoMarshaler gogojsonpb.Marshaler
gogoUnmarshaler gogojsonpb.Unmarshaler
protoMarshalOptions protojson.MarshalOptions
protoUnmarshalOptions protojson.UnmarshalOptions
options ProtoJSONPayloadConverterOptions
}
// ProtoJSONPayloadConverterOptions represents options for `NewProtoJSONPayloadConverterWithOptions`.
type ProtoJSONPayloadConverterOptions struct {
// ExcludeProtobufMessageTypes prevents the message type (`my.package.MyMessage`)
// from being included in the Payload.
ExcludeProtobufMessageTypes bool
// AllowUnknownFields will ignore unknown fields when unmarshalling, as opposed to returning an error
AllowUnknownFields bool
// UseProtoNames uses proto field name instead of lowerCamelCase name in JSON
// field names.
UseProtoNames bool
// UseEnumNumbers emits enum values as numbers.
UseEnumNumbers bool
// EmitUnpopulated specifies whether to emit unpopulated fields.
EmitUnpopulated bool
}
var (
jsonNil, _ = json.Marshal(nil)
)
// NewProtoJSONPayloadConverter creates new instance of `ProtoJSONPayloadConverter`.
func NewProtoJSONPayloadConverter() *ProtoJSONPayloadConverter {
return &ProtoJSONPayloadConverter{
gogoMarshaler: gogojsonpb.Marshaler{},
gogoUnmarshaler: gogojsonpb.Unmarshaler{},
protoMarshalOptions: protojson.MarshalOptions{},
protoUnmarshalOptions: protojson.UnmarshalOptions{},
}
}
// NewProtoJSONPayloadConverterWithOptions creates new instance of `ProtoJSONPayloadConverter` with the provided options.
func NewProtoJSONPayloadConverterWithOptions(options ProtoJSONPayloadConverterOptions) *ProtoJSONPayloadConverter {
return &ProtoJSONPayloadConverter{
gogoMarshaler: gogojsonpb.Marshaler{
EnumsAsInts: options.UseEnumNumbers,
EmitDefaults: options.EmitUnpopulated,
OrigName: options.UseProtoNames,
},
gogoUnmarshaler: gogojsonpb.Unmarshaler{
AllowUnknownFields: options.AllowUnknownFields,
},
protoMarshalOptions: protojson.MarshalOptions{
UseProtoNames: options.UseProtoNames,
UseEnumNumbers: options.UseEnumNumbers,
EmitUnpopulated: options.EmitUnpopulated,
},
protoUnmarshalOptions: protojson.UnmarshalOptions{
DiscardUnknown: options.AllowUnknownFields,
},
options: options,
}
}
// ToPayload converts single proto value to payload.
func (c *ProtoJSONPayloadConverter) ToPayload(value interface{}) (*commonpb.Payload, error) {
// Proto golang structs might be generated with 4 different protoc plugin versions:
// 1. github.com/golang/protobuf - ~v1.3.5 is the most recent pre-APIv2 version of APIv1.
// 2. github.com/golang/protobuf - ^v1.4.0 is a version of APIv1 implemented in terms of APIv2.
// 3. google.golang.org/protobuf - ^v1.20.0 is APIv2.
// 4. github.com/gogo/protobuf - any version.
// Case 1 is not supported.
// Cases 2 and 3 implements proto.Message and are the same in this context.
// Case 4 implements gogoproto.Message.
// It is important to check for proto.Message first because cases 2 and 3 also implement gogoproto.Message.
if isInterfaceNil(value) {
return newPayload(jsonNil, c), nil
}
builtPointer := false
for {
if valueProto, ok := value.(proto.Message); ok {
byteSlice, err := c.protoMarshalOptions.Marshal(valueProto)
if err != nil {
return nil, fmt.Errorf("%w: %v", ErrUnableToEncode, err)
}
return newProtoPayload(byteSlice, c, string(valueProto.ProtoReflect().Descriptor().FullName())), nil
}
if valueGogoProto, ok := value.(gogoproto.Message); ok {
var buf bytes.Buffer
err := c.gogoMarshaler.Marshal(&buf, valueGogoProto)
if err != nil {
return nil, fmt.Errorf("%w: %v", ErrUnableToEncode, err)
}
return newProtoPayload(buf.Bytes(), c, gogoproto.MessageName(valueGogoProto)), nil
}
if builtPointer {
break
}
value = pointerTo(value).Interface()
builtPointer = true
}
return nil, nil
}
// FromPayload converts single proto value from payload.
func (c *ProtoJSONPayloadConverter) FromPayload(payload *commonpb.Payload, valuePtr interface{}) error {
originalValue := reflect.ValueOf(valuePtr)
if originalValue.Kind() != reflect.Ptr {
return fmt.Errorf("type: %T: %w", valuePtr, ErrValuePtrIsNotPointer)
}
originalValue = originalValue.Elem()
if !originalValue.CanSet() {
return fmt.Errorf("type: %T: %w", valuePtr, ErrUnableToSetValue)
}
if bytes.Equal(payload.GetData(), jsonNil) {
originalValue.Set(reflect.Zero(originalValue.Type()))
return nil
}
if originalValue.Kind() == reflect.Interface {
return fmt.Errorf("value type: %s: %w", originalValue.Type().String(), ErrValuePtrMustConcreteType)
}
value := originalValue
// If original value is of value type (i.e. commonpb.WorkflowType), create a pointer to it.
if originalValue.Kind() != reflect.Ptr {
value = pointerTo(originalValue.Interface())
}
protoValue := value.Interface() // protoValue is for sure of pointer type (i.e. *commonpb.WorkflowType).
gogoProtoMessage, isGogoProtoMessage := protoValue.(gogoproto.Message)
protoMessage, isProtoMessage := protoValue.(proto.Message)
if !isGogoProtoMessage && !isProtoMessage {
return fmt.Errorf("type: %T: %w", protoValue, ErrTypeNotImplementProtoMessage)
}
// If original value is nil, create new instance.
if originalValue.Kind() == reflect.Ptr && originalValue.IsNil() {
value = newOfSameType(originalValue)
protoValue = value.Interface()
if isProtoMessage {
protoMessage = protoValue.(proto.Message) // type assertion must always succeed
} else if isGogoProtoMessage {
gogoProtoMessage = protoValue.(gogoproto.Message) // type assertion must always succeed
}
}
var err error
if isProtoMessage {
err = c.protoUnmarshalOptions.Unmarshal(payload.GetData(), protoMessage)
} else if isGogoProtoMessage {
err = c.gogoUnmarshaler.Unmarshal(bytes.NewReader(payload.GetData()), gogoProtoMessage)
}
// If original value wasn't a pointer then set value back to where valuePtr points to.
if originalValue.Kind() != reflect.Ptr {
originalValue.Set(value.Elem())
}
if err != nil {
return fmt.Errorf("%w: %v", ErrUnableToDecode, err)
}
return nil
}
// ToString converts payload object into human readable string.
func (c *ProtoJSONPayloadConverter) ToString(payload *commonpb.Payload) string {
return string(payload.GetData())
}
// Encoding returns MetadataEncodingProtoJSON.
func (c *ProtoJSONPayloadConverter) Encoding() string {
return MetadataEncodingProtoJSON
}
func (c *ProtoJSONPayloadConverter) ExcludeProtobufMessageTypes() bool {
return c.options.ExcludeProtobufMessageTypes
}