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factory.go
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factory.go
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// Copyright The OpenTelemetry Authors
//
// 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 kafkareceiver
import (
"context"
"time"
"go.opentelemetry.io/collector/component"
"go.opentelemetry.io/collector/config/configmodels"
"go.opentelemetry.io/collector/consumer"
"go.opentelemetry.io/collector/exporter/kafkaexporter"
"go.opentelemetry.io/collector/receiver/receiverhelper"
)
const (
typeStr = "kafka"
defaultTopic = "otlp_spans"
defaultEncoding = "otlp_proto"
defaultBroker = "localhost:9092"
defaultClientID = "otel-collector"
defaultGroupID = defaultClientID
// default from sarama.NewConfig()
defaultMetadataRetryMax = 3
// default from sarama.NewConfig()
defaultMetadataRetryBackoff = time.Millisecond * 250
// default from sarama.NewConfig()
defaultMetadataFull = true
)
// FactoryOption applies changes to kafkaExporterFactory.
type FactoryOption func(factory *kafkaReceiverFactory)
// WithAddUnmarshallers adds marshallers.
func WithAddUnmarshallers(encodingMarshaller map[string]Unmarshaller) FactoryOption {
return func(factory *kafkaReceiverFactory) {
for encoding, unmarshaller := range encodingMarshaller {
factory.unmarshalers[encoding] = unmarshaller
}
}
}
// NewFactory creates Kafka receiver factory.
func NewFactory(options ...FactoryOption) component.ReceiverFactory {
f := &kafkaReceiverFactory{
unmarshalers: defaultUnmarshallers(),
}
for _, o := range options {
o(f)
}
return receiverhelper.NewFactory(
typeStr,
createDefaultConfig,
receiverhelper.WithTraces(f.createTraceReceiver))
}
func createDefaultConfig() configmodels.Receiver {
return &Config{
ReceiverSettings: configmodels.ReceiverSettings{
TypeVal: typeStr,
NameVal: typeStr,
},
Topic: defaultTopic,
Encoding: defaultEncoding,
Brokers: []string{defaultBroker},
ClientID: defaultClientID,
GroupID: defaultGroupID,
Metadata: kafkaexporter.Metadata{
Full: defaultMetadataFull,
Retry: kafkaexporter.MetadataRetry{
Max: defaultMetadataRetryMax,
Backoff: defaultMetadataRetryBackoff,
},
},
}
}
type kafkaReceiverFactory struct {
unmarshalers map[string]Unmarshaller
}
func (f *kafkaReceiverFactory) createTraceReceiver(
_ context.Context,
params component.ReceiverCreateParams,
cfg configmodels.Receiver,
nextConsumer consumer.TracesConsumer,
) (component.TracesReceiver, error) {
c := cfg.(*Config)
r, err := newReceiver(*c, params, f.unmarshalers, nextConsumer)
if err != nil {
return nil, err
}
return r, nil
}