/
outputdata.go
executable file
·59 lines (47 loc) · 1.79 KB
/
outputdata.go
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//
// Copyright (c) 2019 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 (
"github.com/epcom-hdxt/app-functions-sdk-go/pkg/util"
"github.com/epcom-hdxt/app-functions-sdk-go/appcontext"
)
// OutputData houses transform for outputting data to configured trigger response, i.e. message bus
type OutputData struct {
ResponseContentType string
}
// NewOutputData creates, initializes and returns a new instance of OutputData
func NewOutputData() OutputData {
return OutputData{}
}
// SetOutputData sets the output data to that passed in from the previous function.
// It will return an error and stop the pipeline if the input data is not of type []byte, string or json.Mashaler
func (f OutputData) SetOutputData(edgexcontext *appcontext.Context, params ...interface{}) (bool, interface{}) {
edgexcontext.LoggingClient.Debug("Setting output data")
if len(params) < 1 {
// We didn't receive a result
return false, nil
}
data, err := util.CoerceType(params[0])
if err != nil {
return false, err
}
if len(f.ResponseContentType) > 0 {
edgexcontext.ResponseContentType = f.ResponseContentType
}
// By setting this the data will be posted back to to configured trigger response, i.e. message bus
edgexcontext.OutputData = data
return true, params[0]
}