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datagenerator_service.go
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datagenerator_service.go
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// Copyright 2018 StreamSets Inc.
// 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 services
import (
"context"
log "github.com/sirupsen/logrus"
"github.com/spf13/cast"
"github.com/streamsets/datacollector-edge/api"
"github.com/streamsets/datacollector-edge/api/dataformats"
"github.com/streamsets/datacollector-edge/api/validation"
"github.com/streamsets/datacollector-edge/container/el"
"github.com/streamsets/datacollector-edge/stages/lib/datagenerator"
"github.com/streamsets/datacollector-edge/stages/stagelibrary"
"io"
)
type DataGeneratorServiceImpl struct {
stageContext api.StageContext
DataFormat string `ConfigDef:"type=STRING,required=true"`
DataGeneratorFormatConfig datagenerator.DataGeneratorFormatConfig `ConfigDefBean:"dataGeneratorFormatConfig"`
}
func init() {
stagelibrary.SetServiceCreator(dataformats.DataFormatGeneratorServiceName, func() api.Service {
return &DataGeneratorServiceImpl{}
})
}
func (d *DataGeneratorServiceImpl) Init(stageContext api.StageContext) []validation.Issue {
d.stageContext = stageContext
issues := make([]validation.Issue, 0)
log.Debug("DataGeneratorServiceImpl Init method")
d.DataGeneratorFormatConfig.Init(d.DataFormat, stageContext, issues)
return issues
}
func (d *DataGeneratorServiceImpl) GetGenerator(writer io.Writer) (dataformats.RecordWriter, error) {
recordWriterFactory := d.DataGeneratorFormatConfig.RecordWriterFactory
return recordWriterFactory.CreateWriter(d.stageContext, writer)
}
func (d *DataGeneratorServiceImpl) Destroy() error {
return nil
}
func (d *DataGeneratorServiceImpl) IsWholeFileFormat() bool {
return d.DataFormat == "WHOLE_FILE"
}
func (d *DataGeneratorServiceImpl) GetWholeFileName(record api.Record) (string, error) {
recordContext := context.WithValue(context.Background(), el.RecordContextVar, record)
result, err := d.stageContext.Evaluate(d.DataGeneratorFormatConfig.FileNameEL, "fileNameEl", recordContext)
if err != nil {
return "", err
}
return cast.ToString(result), nil
}
func (d *DataGeneratorServiceImpl) GetWholeFileExistsAction() string {
return d.DataGeneratorFormatConfig.WholeFileExistsAction
}
func (d *DataGeneratorServiceImpl) GetIncludeChecksumInTheEvents() bool {
return d.DataGeneratorFormatConfig.IncludeChecksumInTheEvents
}
func (d *DataGeneratorServiceImpl) GetChecksumAlgorithm() string {
return d.DataGeneratorFormatConfig.ChecksumAlgorithm
}