/
conversion.go
executable file
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/
conversion.go
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//
// Copyright (c) 2021 Intel Corporation
//
// 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 transforms
import (
"encoding/json"
"fmt"
"github.com/edgexfoundry/app-functions-sdk-go/v3/pkg/interfaces"
"github.com/edgexfoundry/go-mod-core-contracts/v3/common"
"github.com/edgexfoundry/go-mod-core-contracts/v3/dtos"
)
// Conversion houses various built in conversion transforms (XML, JSON, CSV)
type Conversion struct {
}
// NewConversion creates, initializes and returns a new instance of Conversion
func NewConversion() *Conversion {
return &Conversion{}
}
// TransformToXML transforms an EdgeX event to XML.
// It will return an error and stop the pipeline if a non-edgex event is received or if no data is received.
func (f *Conversion) TransformToXML(ctx interfaces.AppFunctionContext, data interface{}) (continuePipeline bool, stringType interface{}) {
if data == nil {
return false, fmt.Errorf("function TransformToXML in pipeline '%s': No Data Received", ctx.PipelineId())
}
ctx.LoggingClient().Debugf("Transforming to XML in pipeline '%s'", ctx.PipelineId())
if event, ok := data.(dtos.Event); ok {
xml, err := event.ToXML()
if err != nil {
return false, fmt.Errorf("unable to marshal Event to XML in pipeline '%s': %s", ctx.PipelineId(), err.Error())
}
ctx.SetResponseContentType(common.ContentTypeXML)
return true, xml
}
return false, fmt.Errorf("function TransformToXML in pipeline '%s': unexpected type received", ctx.PipelineId())
}
// TransformToJSON transforms an EdgeX event to JSON.
// It will return an error and stop the pipeline if a non-edgex event is received or if no data is received.
func (f *Conversion) TransformToJSON(ctx interfaces.AppFunctionContext, data interface{}) (continuePipeline bool, stringType interface{}) {
if data == nil {
return false, fmt.Errorf("function TransformToJSON in pipeline '%s': No Data Received", ctx.PipelineId())
}
ctx.LoggingClient().Debugf("Transforming to JSON in pipeline '%s'", ctx.PipelineId())
if result, ok := data.(dtos.Event); ok {
b, err := json.Marshal(result)
if err != nil {
return false, fmt.Errorf("unable to marshal Event to JSON in pipeline '%s': %s", ctx.PipelineId(), err.Error())
}
ctx.SetResponseContentType(common.ContentTypeJSON)
// should we return a byte[] or string?
// return b
return true, string(b)
}
return false, fmt.Errorf("function TransformToJSON in pipeline '%s': unexpected type received", ctx.PipelineId())
}