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eventhubs.go
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eventhubs.go
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// Copyright 2019 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 eventhubs
import (
"bytes"
"context"
"github.com/Azure/azure-event-hubs-go"
"github.com/sirupsen/logrus"
"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/common"
"github.com/streamsets/datacollector-edge/stages/lib/datagenerator"
"github.com/streamsets/datacollector-edge/stages/stagelibrary"
)
const (
Library = "streamsets-datacollector-azure-lib"
StageName = "com_streamsets_pipeline_stage_destination_eventhubs_EventHubProducerDTarget"
)
type Destination struct {
*common.BaseStage
CommonConf EventHubConfigBean `ConfigDefBean:"commonConf"`
ProducerConf EventHubProducerConfigBean `ConfigDefBean:"producerConf"`
eventHubClient *eventhub.Hub
}
type EventHubConfigBean struct {
NamespaceName string `ConfigDef:"type=STRING,required=true"`
EventHubName string `ConfigDef:"type=STRING,required=true"`
SasKeyName string `ConfigDef:"type=STRING,required=true"`
SasKey string `ConfigDef:"type=STRING,required=true"`
}
type EventHubProducerConfigBean struct {
DataFormat string `ConfigDef:"type=STRING,required=true"`
DataGeneratorFormatConfig datagenerator.DataGeneratorFormatConfig `ConfigDefBean:"dataGeneratorFormatConfig"`
}
func init() {
stagelibrary.SetCreator(Library, StageName, func() api.Stage {
return &Destination{BaseStage: &common.BaseStage{}}
})
}
func (dest *Destination) Init(stageContext api.StageContext) []validation.Issue {
issues := dest.BaseStage.Init(stageContext)
var err error
dest.eventHubClient, err = eventhub.NewHubFromConnectionString(dest.CommonConf.SasKey)
if err != nil {
issues = append(issues, stageContext.CreateConfigIssue(err.Error()))
return issues
}
issues = dest.ProducerConf.DataGeneratorFormatConfig.Init(dest.ProducerConf.DataFormat, stageContext, issues)
return issues
}
func (dest *Destination) Write(batch api.Batch) error {
recordWriterFactory := dest.ProducerConf.DataGeneratorFormatConfig.RecordWriterFactory
records := batch.GetRecords()
events := make([]*eventhub.Event, 0)
for _, record := range records {
recordBuffer := bytes.NewBuffer([]byte{})
recordWriter, err := recordWriterFactory.CreateWriter(dest.GetStageContext(), recordBuffer)
if err != nil {
logrus.WithError(err).Error("Error creating writer")
dest.GetStageContext().ToError(err, record)
break
}
err = recordWriter.WriteRecord(record)
if err != nil {
logrus.WithError(err).Error("Error writing record")
dest.GetStageContext().ToError(err, record)
break
}
flushAndCloseWriter(recordWriter)
events = append(events, eventhub.NewEvent(recordBuffer.Bytes()))
}
err := dest.eventHubClient.SendBatch(context.Background(), eventhub.NewEventBatch(events))
if err != nil {
logrus.WithError(err).Error("error while writing records to Azure Event Hub")
for _, record := range records {
dest.GetStageContext().ToError(err, record)
}
return nil
}
return nil
}
func flushAndCloseWriter(recordWriter dataformats.RecordWriter) {
err := recordWriter.Flush()
if err != nil {
logrus.WithError(err).Error("Error flushing record writer")
}
err = recordWriter.Close()
if err != nil {
logrus.WithError(err).Error("Error closing record writer")
}
}