peridot/vendor/go.temporal.io/sdk/converter/nil_payload_converter.go

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2022-07-07 20:11:50 +00:00
// 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 (
"fmt"
"reflect"
commonpb "go.temporal.io/api/common/v1"
)
// NilPayloadConverter doesn't set Data field in payload.
type NilPayloadConverter struct {
}
// NewNilPayloadConverter creates new instance of NilPayloadConverter.
func NewNilPayloadConverter() *NilPayloadConverter {
return &NilPayloadConverter{}
}
// ToPayload converts single nil value to payload.
func (c *NilPayloadConverter) ToPayload(value interface{}) (*commonpb.Payload, error) {
if isInterfaceNil(value) {
return newPayload(nil, c), nil
}
return nil, nil
}
// FromPayload converts single nil value from payload.
func (c *NilPayloadConverter) FromPayload(_ *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)
}
originalValue.Set(reflect.Zero(originalValue.Type()))
return nil
}
// ToString converts payload object into human readable string.
func (c *NilPayloadConverter) ToString(*commonpb.Payload) string {
return "nil"
}
// Encoding returns MetadataEncodingNil.
func (c *NilPayloadConverter) Encoding() string {
return MetadataEncodingNil
}